David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2016 gRPC authors. |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
David Garcia Quintas | 8b3b97f | 2016-07-15 07:46:47 -0700 | [diff] [blame] | 19 | /** Implementation of the gRPC LB policy. |
| 20 | * |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 21 | * This policy takes as input a set of resolved addresses {a1..an} for which the |
| 22 | * LB set was set (it's the resolver's responsibility to ensure this). That is |
| 23 | * to say, {a1..an} represent a collection of LB servers. |
| 24 | * |
| 25 | * An internal channel (\a glb_lb_policy.lb_channel) is created over {a1..an}. |
| 26 | * This channel behaves just like a regular channel. In particular, the |
| 27 | * constructed URI over the addresses a1..an will use the default pick first |
| 28 | * policy to select from this list of LB server backends. |
| 29 | * |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 30 | * The first time the policy gets a request for a pick, a ping, or to exit the |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 31 | * idle state, \a query_for_backends_locked() is called. This function sets up |
| 32 | * and initiates the internal communication with the LB server. In particular, |
| 33 | * it's responsible for instantiating the internal *streaming* call to the LB |
| 34 | * server (whichever address from {a1..an} pick-first chose). This call is |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 35 | * serviced by two callbacks, \a lb_on_server_status_received and \a |
| 36 | * lb_on_response_received. The former will be called when the call to the LB |
| 37 | * server completes. This can happen if the LB server closes the connection or |
| 38 | * if this policy itself cancels the call (for example because it's shutting |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 39 | * down). If the internal call times out, the usual behavior of pick-first |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 40 | * applies, continuing to pick from the list {a1..an}. |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 41 | * |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 42 | * Upon sucesss, the incoming \a LoadBalancingResponse is processed by \a |
| 43 | * res_recv. An invalid one results in the termination of the streaming call. A |
| 44 | * new streaming call should be created if possible, failing the original call |
| 45 | * otherwise. For a valid \a LoadBalancingResponse, the server list of actual |
| 46 | * backends is extracted. A Round Robin policy will be created from this list. |
| 47 | * There are two possible scenarios: |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 48 | * |
| 49 | * 1. This is the first server list received. There was no previous instance of |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 50 | * the Round Robin policy. \a rr_handover_locked() will instantiate the RR |
| 51 | * policy and perform all the pending operations over it. |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 52 | * 2. There's already a RR policy instance active. We need to introduce the new |
| 53 | * one build from the new serverlist, but taking care not to disrupt the |
| 54 | * operations in progress over the old RR instance. This is done by |
| 55 | * decreasing the reference count on the old policy. The moment no more |
| 56 | * references are held on the old RR policy, it'll be destroyed and \a |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 57 | * on_rr_connectivity_changed notified with a \a GRPC_CHANNEL_SHUTDOWN |
David Garcia Quintas | 348cfdb | 2016-08-19 12:19:43 -0700 | [diff] [blame] | 58 | * state. At this point we can transition to a new RR instance safely, which |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 59 | * is done once again via \a rr_handover_locked(). |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 60 | * |
| 61 | * |
| 62 | * Once a RR policy instance is in place (and getting updated as described), |
| 63 | * calls to for a pick, a ping or a cancellation will be serviced right away by |
| 64 | * forwarding them to the RR instance. Any time there's no RR policy available |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 65 | * (ie, right after the creation of the gRPCLB policy, if an empty serverlist is |
| 66 | * received, etc), pick/ping requests are added to a list of pending picks/pings |
| 67 | * to be flushed and serviced as part of \a rr_handover_locked() the moment the |
| 68 | * RR policy instance becomes available. |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 69 | * |
| 70 | * \see https://github.com/grpc/grpc/blob/master/doc/load-balancing.md for the |
| 71 | * high level design and details. */ |
David Garcia Quintas | 8b3b97f | 2016-07-15 07:46:47 -0700 | [diff] [blame] | 72 | |
| 73 | /* TODO(dgq): |
| 74 | * - Implement LB service forwarding (point 2c. in the doc's diagram). |
| 75 | */ |
| 76 | |
murgatroid99 | 085f9af | 2016-10-24 09:55:44 -0700 | [diff] [blame] | 77 | /* With the addition of a libuv endpoint, sockaddr.h now includes uv.h when |
| 78 | using that endpoint. Because of various transitive includes in uv.h, |
| 79 | including windows.h on Windows, uv.h must be included before other system |
| 80 | headers. Therefore, sockaddr.h must always be included first */ |
murgatroid99 | 7871f73 | 2016-09-23 13:49:05 -0700 | [diff] [blame] | 81 | #include "src/core/lib/iomgr/sockaddr.h" |
| 82 | |
Yash Tibrewal | fcd26bc | 2017-09-25 15:08:28 -0700 | [diff] [blame] | 83 | #include <inttypes.h> |
Mark D. Roth | 64d922a | 2017-05-03 12:52:04 -0700 | [diff] [blame] | 84 | #include <limits.h> |
David Garcia Quintas | 22e8f1d | 2016-06-15 23:53:00 -0700 | [diff] [blame] | 85 | #include <string.h> |
| 86 | |
| 87 | #include <grpc/byte_buffer_reader.h> |
| 88 | #include <grpc/grpc.h> |
| 89 | #include <grpc/support/alloc.h> |
David Garcia Quintas | 22e8f1d | 2016-06-15 23:53:00 -0700 | [diff] [blame] | 90 | #include <grpc/support/string_util.h> |
David Garcia Quintas | 6909922 | 2016-10-03 11:28:37 -0700 | [diff] [blame] | 91 | #include <grpc/support/time.h> |
David Garcia Quintas | 22e8f1d | 2016-06-15 23:53:00 -0700 | [diff] [blame] | 92 | |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 93 | #include "src/core/ext/filters/client_channel/client_channel.h" |
| 94 | #include "src/core/ext/filters/client_channel/client_channel_factory.h" |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 95 | #include "src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.h" |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 96 | #include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.h" |
| 97 | #include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel.h" |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 98 | #include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_client_stats.h" |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 99 | #include "src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.h" |
Craig Tiller | d52e22f | 2017-04-02 16:22:52 -0700 | [diff] [blame] | 100 | #include "src/core/ext/filters/client_channel/lb_policy_factory.h" |
| 101 | #include "src/core/ext/filters/client_channel/lb_policy_registry.h" |
| 102 | #include "src/core/ext/filters/client_channel/parse_address.h" |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 103 | #include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" |
Juanli Shen | 6502ecc | 2017-09-13 13:10:54 -0700 | [diff] [blame] | 104 | #include "src/core/ext/filters/client_channel/subchannel_index.h" |
Craig Tiller | c0df1c0 | 2017-07-17 16:12:33 -0700 | [diff] [blame] | 105 | #include "src/core/lib/backoff/backoff.h" |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 106 | #include "src/core/lib/channel/channel_args.h" |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 107 | #include "src/core/lib/channel/channel_stack.h" |
Vijay Pai | ae376bf | 2018-01-25 22:54:02 -0800 | [diff] [blame] | 108 | #include "src/core/lib/gpr/host_port.h" |
Mark D. Roth | dbdf495 | 2018-01-18 11:21:12 -0800 | [diff] [blame] | 109 | #include "src/core/lib/gpr/string.h" |
Mark D. Roth | 4f2b0fd | 2018-01-19 12:12:23 -0800 | [diff] [blame] | 110 | #include "src/core/lib/gprpp/manual_constructor.h" |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 111 | #include "src/core/lib/gprpp/ref_counted_ptr.h" |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 112 | #include "src/core/lib/iomgr/combiner.h" |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 113 | #include "src/core/lib/iomgr/sockaddr.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 114 | #include "src/core/lib/iomgr/sockaddr_utils.h" |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 115 | #include "src/core/lib/iomgr/timer.h" |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 116 | #include "src/core/lib/slice/slice_hash_table.h" |
Craig Tiller | 18b4ba3 | 2016-11-09 15:23:42 -0800 | [diff] [blame] | 117 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 0f31080 | 2016-10-26 16:25:56 -0700 | [diff] [blame] | 118 | #include "src/core/lib/slice/slice_string_helpers.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 119 | #include "src/core/lib/surface/call.h" |
| 120 | #include "src/core/lib/surface/channel.h" |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 121 | #include "src/core/lib/surface/channel_init.h" |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 122 | #include "src/core/lib/transport/static_metadata.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 123 | |
David Garcia Quintas | 1edfb95 | 2016-11-22 17:15:34 -0800 | [diff] [blame] | 124 | #define GRPC_GRPCLB_INITIAL_CONNECT_BACKOFF_SECONDS 1 |
| 125 | #define GRPC_GRPCLB_RECONNECT_BACKOFF_MULTIPLIER 1.6 |
| 126 | #define GRPC_GRPCLB_RECONNECT_MAX_BACKOFF_SECONDS 120 |
| 127 | #define GRPC_GRPCLB_RECONNECT_JITTER 0.2 |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 128 | #define GRPC_GRPCLB_DEFAULT_FALLBACK_TIMEOUT_MS 10000 |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 129 | |
Craig Tiller | 694580f | 2017-10-18 14:48:14 -0700 | [diff] [blame] | 130 | grpc_core::TraceFlag grpc_lb_glb_trace(false, "glb"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 131 | |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 132 | struct glb_lb_policy; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 133 | |
Vijay Pai | 849bd73 | 2018-01-02 23:30:47 +0000 | [diff] [blame] | 134 | namespace { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 135 | |
| 136 | /// Linked list of pending pick requests. It stores all information needed to |
| 137 | /// eventually call (Round Robin's) pick() on them. They mainly stay pending |
| 138 | /// waiting for the RR policy to be created. |
| 139 | /// |
| 140 | /// Note that when a pick is sent to the RR policy, we inject our own |
| 141 | /// on_complete callback, so that we can intercept the result before |
| 142 | /// invoking the original on_complete callback. This allows us to set the |
| 143 | /// LB token metadata and add client_stats to the call context. |
| 144 | /// See \a pending_pick_complete() for details. |
Vijay Pai | 849bd73 | 2018-01-02 23:30:47 +0000 | [diff] [blame] | 145 | struct pending_pick { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 146 | // Our on_complete closure and the original one. |
| 147 | grpc_closure on_complete; |
| 148 | grpc_closure* original_on_complete; |
| 149 | // The original pick. |
| 150 | grpc_lb_policy_pick_state* pick; |
| 151 | // Stats for client-side load reporting. Note that this holds a |
| 152 | // reference, which must be either passed on via context or unreffed. |
| 153 | grpc_grpclb_client_stats* client_stats; |
| 154 | // The LB token associated with the pick. This is set via user_data in |
| 155 | // the pick. |
| 156 | grpc_mdelem lb_token; |
| 157 | // The grpclb instance that created the wrapping. This instance is not owned, |
| 158 | // reference counts are untouched. It's used only for logging purposes. |
| 159 | glb_lb_policy* glb_policy; |
| 160 | // Next pending pick. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 161 | struct pending_pick* next; |
Vijay Pai | 849bd73 | 2018-01-02 23:30:47 +0000 | [diff] [blame] | 162 | }; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 163 | |
| 164 | /// A linked list of pending pings waiting for the RR policy to be created. |
| 165 | struct pending_ping { |
| 166 | grpc_closure* on_initiate; |
| 167 | grpc_closure* on_ack; |
| 168 | struct pending_ping* next; |
| 169 | }; |
| 170 | |
Vijay Pai | 849bd73 | 2018-01-02 23:30:47 +0000 | [diff] [blame] | 171 | } // namespace |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 172 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 173 | typedef struct glb_lb_call_data { |
| 174 | struct glb_lb_policy* glb_policy; |
Juanli Shen | c872ad4 | 2018-01-24 10:29:38 -0800 | [diff] [blame] | 175 | // TODO(juanlishen): c++ize this struct. |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 176 | gpr_refcount refs; |
| 177 | |
| 178 | /** The streaming call to the LB server. Always non-NULL. */ |
| 179 | grpc_call* lb_call; |
| 180 | |
| 181 | /** The initial metadata received from the LB server. */ |
| 182 | grpc_metadata_array lb_initial_metadata_recv; |
| 183 | |
| 184 | /** The message sent to the LB server. It's used to query for backends (the |
| 185 | * value may vary if the LB server indicates a redirect) or send client load |
| 186 | * report. */ |
| 187 | grpc_byte_buffer* send_message_payload; |
| 188 | /** The callback after the initial request is sent. */ |
| 189 | grpc_closure lb_on_sent_initial_request; |
| 190 | |
| 191 | /** The response received from the LB server, if any. */ |
| 192 | grpc_byte_buffer* recv_message_payload; |
| 193 | /** The callback to process the response received from the LB server. */ |
| 194 | grpc_closure lb_on_response_received; |
| 195 | bool seen_initial_response; |
| 196 | |
| 197 | /** The callback to process the status received from the LB server, which |
| 198 | * signals the end of the LB call. */ |
| 199 | grpc_closure lb_on_server_status_received; |
| 200 | /** The trailing metadata from the LB server. */ |
| 201 | grpc_metadata_array lb_trailing_metadata_recv; |
| 202 | /** The call status code and details. */ |
| 203 | grpc_status_code lb_call_status; |
| 204 | grpc_slice lb_call_status_details; |
| 205 | |
| 206 | /** The stats for client-side load reporting associated with this LB call. |
| 207 | * Created after the first serverlist is received. */ |
| 208 | grpc_grpclb_client_stats* client_stats; |
| 209 | /** The interval and timer for next client load report. */ |
| 210 | grpc_millis client_stats_report_interval; |
| 211 | grpc_timer client_load_report_timer; |
| 212 | bool client_load_report_timer_callback_pending; |
| 213 | bool last_client_load_report_counters_were_zero; |
| 214 | bool client_load_report_is_due; |
| 215 | /** The closure used for either the load report timer or the callback for |
| 216 | * completion of sending the load report. */ |
| 217 | grpc_closure client_load_report_closure; |
| 218 | } glb_lb_call_data; |
| 219 | |
| 220 | typedef struct glb_lb_policy { |
| 221 | /** Base policy: must be first. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 222 | grpc_lb_policy base; |
| 223 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 224 | /** Who the client is trying to communicate with. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 225 | const char* server_name; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 226 | |
| 227 | /** Channel related data that will be propagated to the internal RR policy. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 228 | grpc_client_channel_factory* cc_factory; |
| 229 | grpc_channel_args* args; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 230 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 231 | /** Timeout in milliseconds for before using fallback backend addresses. |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 232 | * 0 means not using fallback. */ |
| 233 | int lb_fallback_timeout_ms; |
| 234 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 235 | /** The channel for communicating with the LB server. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 236 | grpc_channel* lb_channel; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 237 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 238 | /** The data associated with the current LB call. It holds a ref to this LB |
| 239 | * policy. It's initialized every time we query for backends. It's reset to |
| 240 | * NULL whenever the current LB call is no longer needed (e.g., the LB policy |
| 241 | * is shutting down, or the LB call has ended). A non-NULL lb_calld always |
| 242 | * contains a non-NULL lb_call. */ |
| 243 | glb_lb_call_data* lb_calld; |
| 244 | |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 245 | /** response generator to inject address updates into \a lb_channel */ |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 246 | grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator> |
| 247 | response_generator; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 248 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 249 | /** the RR policy to use of the backend servers returned by the LB server */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 250 | grpc_lb_policy* rr_policy; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 251 | |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 252 | /** the connectivity state of the embedded RR policy */ |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 253 | grpc_connectivity_state rr_connectivity_state; |
| 254 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 255 | bool started_picking; |
| 256 | |
| 257 | /** our connectivity state tracker */ |
| 258 | grpc_connectivity_state_tracker state_tracker; |
| 259 | |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 260 | /** connectivity state of the LB channel */ |
| 261 | grpc_connectivity_state lb_channel_connectivity; |
| 262 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 263 | /** stores the deserialized response from the LB. May be nullptr until one |
| 264 | * such response has arrived. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 265 | grpc_grpclb_serverlist* serverlist; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 266 | |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 267 | /** Index into serverlist for next pick. |
| 268 | * If the server at this index is a drop, we return a drop. |
| 269 | * Otherwise, we delegate to the RR policy. */ |
| 270 | size_t serverlist_index; |
| 271 | |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 272 | /** stores the backend addresses from the resolver */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 273 | grpc_lb_addresses* fallback_backend_addresses; |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 274 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 275 | /** list of picks that are waiting on RR's policy connectivity */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 276 | pending_pick* pending_picks; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 277 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 278 | /** list of pings that are waiting on RR's policy connectivity */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 279 | pending_ping* pending_pings; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 280 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 281 | bool shutting_down; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 282 | |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 283 | /** are we already watching the LB channel's connectivity? */ |
| 284 | bool watching_lb_channel; |
| 285 | |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 286 | /** is the callback associated with \a lb_call_retry_timer pending? */ |
| 287 | bool retry_timer_callback_pending; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 288 | |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 289 | /** is the callback associated with \a lb_fallback_timer pending? */ |
| 290 | bool fallback_timer_callback_pending; |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 291 | |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 292 | /** called upon changes to the LB channel's connectivity. */ |
| 293 | grpc_closure lb_channel_on_connectivity_changed; |
| 294 | |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 295 | /** called upon changes to the RR's connectivity. */ |
| 296 | grpc_closure rr_on_connectivity_changed; |
| 297 | |
| 298 | /** called upon reresolution request from the RR policy. */ |
| 299 | grpc_closure rr_on_reresolution_requested; |
| 300 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 301 | /************************************************************/ |
| 302 | /* client data associated with the LB server communication */ |
| 303 | /************************************************************/ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 304 | |
| 305 | /** LB call retry backoff state */ |
David Garcia Quintas | 0f91e51 | 2017-12-04 16:12:54 -0800 | [diff] [blame] | 306 | grpc_core::ManualConstructor<grpc_core::BackOff> lb_call_backoff; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 307 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 308 | /** timeout in milliseconds for the LB call. 0 means no deadline. */ |
| 309 | int lb_call_timeout_ms; |
| 310 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 311 | /** LB call retry timer */ |
| 312 | grpc_timer lb_call_retry_timer; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 313 | /** LB call retry timer callback */ |
| 314 | grpc_closure lb_on_call_retry; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 315 | |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 316 | /** LB fallback timer */ |
| 317 | grpc_timer lb_fallback_timer; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 318 | /** LB fallback timer callback */ |
| 319 | grpc_closure lb_on_fallback; |
| 320 | } glb_lb_policy; |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 321 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 322 | static void glb_lb_call_data_ref(glb_lb_call_data* lb_calld, |
| 323 | const char* reason) { |
| 324 | gpr_ref_non_zero(&lb_calld->refs); |
| 325 | if (grpc_lb_glb_trace.enabled()) { |
| 326 | const gpr_atm count = gpr_atm_acq_load(&lb_calld->refs.count); |
| 327 | gpr_log(GPR_DEBUG, "[%s %p] lb_calld %p REF %lu->%lu (%s)", |
| 328 | grpc_lb_glb_trace.name(), lb_calld->glb_policy, lb_calld, |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 329 | static_cast<unsigned long>(count - 1), |
| 330 | static_cast<unsigned long>(count), reason); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 331 | } |
| 332 | } |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 333 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 334 | static void glb_lb_call_data_unref(glb_lb_call_data* lb_calld, |
| 335 | const char* reason) { |
| 336 | const bool done = gpr_unref(&lb_calld->refs); |
| 337 | if (grpc_lb_glb_trace.enabled()) { |
| 338 | const gpr_atm count = gpr_atm_acq_load(&lb_calld->refs.count); |
| 339 | gpr_log(GPR_DEBUG, "[%s %p] lb_calld %p UNREF %lu->%lu (%s)", |
| 340 | grpc_lb_glb_trace.name(), lb_calld->glb_policy, lb_calld, |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 341 | static_cast<unsigned long>(count + 1), |
| 342 | static_cast<unsigned long>(count), reason); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 343 | } |
| 344 | if (done) { |
| 345 | GPR_ASSERT(lb_calld->lb_call != nullptr); |
| 346 | grpc_call_unref(lb_calld->lb_call); |
| 347 | grpc_metadata_array_destroy(&lb_calld->lb_initial_metadata_recv); |
| 348 | grpc_metadata_array_destroy(&lb_calld->lb_trailing_metadata_recv); |
| 349 | grpc_byte_buffer_destroy(lb_calld->send_message_payload); |
| 350 | grpc_byte_buffer_destroy(lb_calld->recv_message_payload); |
| 351 | grpc_slice_unref_internal(lb_calld->lb_call_status_details); |
| 352 | if (lb_calld->client_stats != nullptr) { |
| 353 | grpc_grpclb_client_stats_unref(lb_calld->client_stats); |
| 354 | } |
| 355 | GRPC_LB_POLICY_UNREF(&lb_calld->glb_policy->base, "lb_calld"); |
| 356 | gpr_free(lb_calld); |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | static void lb_call_data_shutdown(glb_lb_policy* glb_policy) { |
| 361 | GPR_ASSERT(glb_policy->lb_calld != nullptr); |
| 362 | GPR_ASSERT(glb_policy->lb_calld->lb_call != nullptr); |
| 363 | // lb_on_server_status_received will complete the cancellation and clean up. |
| 364 | grpc_call_cancel(glb_policy->lb_calld->lb_call, nullptr); |
| 365 | if (glb_policy->lb_calld->client_load_report_timer_callback_pending) { |
| 366 | grpc_timer_cancel(&glb_policy->lb_calld->client_load_report_timer); |
| 367 | } |
| 368 | glb_policy->lb_calld = nullptr; |
| 369 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 370 | |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 371 | /* add lb_token of selected subchannel (address) to the call's initial |
| 372 | * metadata */ |
| 373 | static grpc_error* initial_metadata_add_lb_token( |
| 374 | grpc_metadata_batch* initial_metadata, |
| 375 | grpc_linked_mdelem* lb_token_mdelem_storage, grpc_mdelem lb_token) { |
| 376 | GPR_ASSERT(lb_token_mdelem_storage != nullptr); |
| 377 | GPR_ASSERT(!GRPC_MDISNULL(lb_token)); |
| 378 | return grpc_metadata_batch_add_tail(initial_metadata, lb_token_mdelem_storage, |
| 379 | lb_token); |
| 380 | } |
| 381 | |
| 382 | static void destroy_client_stats(void* arg) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 383 | grpc_grpclb_client_stats_unref(static_cast<grpc_grpclb_client_stats*>(arg)); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | static void pending_pick_set_metadata_and_context(pending_pick* pp) { |
| 387 | /* if connected_subchannel is nullptr, no pick has been made by the RR |
| 388 | * policy (e.g., all addresses failed to connect). There won't be any |
| 389 | * user_data/token available */ |
David Garcia Quintas | be1b7f9 | 2018-01-12 14:01:38 -0800 | [diff] [blame] | 390 | if (pp->pick->connected_subchannel != nullptr) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 391 | if (!GRPC_MDISNULL(pp->lb_token)) { |
| 392 | initial_metadata_add_lb_token(pp->pick->initial_metadata, |
| 393 | &pp->pick->lb_token_mdelem_storage, |
| 394 | GRPC_MDELEM_REF(pp->lb_token)); |
| 395 | } else { |
| 396 | gpr_log(GPR_ERROR, |
| 397 | "[grpclb %p] No LB token for connected subchannel pick %p", |
| 398 | pp->glb_policy, pp->pick); |
| 399 | abort(); |
| 400 | } |
| 401 | // Pass on client stats via context. Passes ownership of the reference. |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 402 | if (pp->client_stats != nullptr) { |
| 403 | pp->pick->subchannel_call_context[GRPC_GRPCLB_CLIENT_STATS].value = |
| 404 | pp->client_stats; |
| 405 | pp->pick->subchannel_call_context[GRPC_GRPCLB_CLIENT_STATS].destroy = |
| 406 | destroy_client_stats; |
| 407 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 408 | } else { |
Mark D. Roth | 83d5cd6 | 2018-01-11 08:56:53 -0800 | [diff] [blame] | 409 | if (pp->client_stats != nullptr) { |
| 410 | grpc_grpclb_client_stats_unref(pp->client_stats); |
| 411 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 412 | } |
| 413 | } |
| 414 | |
| 415 | /* The \a on_complete closure passed as part of the pick requires keeping a |
| 416 | * reference to its associated round robin instance. We wrap this closure in |
| 417 | * order to unref the round robin instance upon its invocation */ |
| 418 | static void pending_pick_complete(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 419 | pending_pick* pp = static_cast<pending_pick*>(arg); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 420 | pending_pick_set_metadata_and_context(pp); |
| 421 | GRPC_CLOSURE_SCHED(pp->original_on_complete, GRPC_ERROR_REF(error)); |
| 422 | gpr_free(pp); |
| 423 | } |
| 424 | |
| 425 | static pending_pick* pending_pick_create(glb_lb_policy* glb_policy, |
| 426 | grpc_lb_policy_pick_state* pick) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 427 | pending_pick* pp = static_cast<pending_pick*>(gpr_zalloc(sizeof(*pp))); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 428 | pp->pick = pick; |
| 429 | pp->glb_policy = glb_policy; |
| 430 | GRPC_CLOSURE_INIT(&pp->on_complete, pending_pick_complete, pp, |
| 431 | grpc_schedule_on_exec_ctx); |
| 432 | pp->original_on_complete = pick->on_complete; |
| 433 | pp->pick->on_complete = &pp->on_complete; |
| 434 | return pp; |
| 435 | } |
| 436 | |
| 437 | static void pending_pick_add(pending_pick** root, pending_pick* new_pp) { |
| 438 | new_pp->next = *root; |
| 439 | *root = new_pp; |
| 440 | } |
| 441 | |
| 442 | static void pending_ping_add(pending_ping** root, grpc_closure* on_initiate, |
| 443 | grpc_closure* on_ack) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 444 | pending_ping* pping = static_cast<pending_ping*>(gpr_zalloc(sizeof(*pping))); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 445 | pping->on_initiate = on_initiate; |
| 446 | pping->on_ack = on_ack; |
| 447 | pping->next = *root; |
| 448 | *root = pping; |
| 449 | } |
| 450 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 451 | static bool is_server_valid(const grpc_grpclb_server* server, size_t idx, |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 452 | bool log) { |
Mark D. Roth | e775180 | 2017-07-27 12:31:45 -0700 | [diff] [blame] | 453 | if (server->drop) return false; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 454 | const grpc_grpclb_ip_address* ip = &server->ip_address; |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 455 | if (server->port >> 16 != 0) { |
| 456 | if (log) { |
| 457 | gpr_log(GPR_ERROR, |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 458 | "Invalid port '%d' at index %lu of serverlist. Ignoring.", |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 459 | server->port, static_cast<unsigned long>(idx)); |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 460 | } |
| 461 | return false; |
| 462 | } |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 463 | if (ip->size != 4 && ip->size != 16) { |
| 464 | if (log) { |
| 465 | gpr_log(GPR_ERROR, |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 466 | "Expected IP to be 4 or 16 bytes, got %d at index %lu of " |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 467 | "serverlist. Ignoring", |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 468 | ip->size, static_cast<unsigned long>(idx)); |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 469 | } |
| 470 | return false; |
| 471 | } |
| 472 | return true; |
| 473 | } |
| 474 | |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 475 | /* vtable for LB tokens in grpc_lb_addresses. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 476 | static void* lb_token_copy(void* token) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 477 | return token == nullptr |
| 478 | ? nullptr |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 479 | : (void*)GRPC_MDELEM_REF(grpc_mdelem{(uintptr_t)token}).payload; |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 480 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 481 | static void lb_token_destroy(void* token) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 482 | if (token != nullptr) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 483 | GRPC_MDELEM_UNREF(grpc_mdelem{(uintptr_t)token}); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 484 | } |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 485 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 486 | static int lb_token_cmp(void* token1, void* token2) { |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 487 | if (token1 > token2) return 1; |
| 488 | if (token1 < token2) return -1; |
| 489 | return 0; |
| 490 | } |
| 491 | static const grpc_lb_user_data_vtable lb_token_vtable = { |
| 492 | lb_token_copy, lb_token_destroy, lb_token_cmp}; |
| 493 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 494 | static void parse_server(const grpc_grpclb_server* server, |
| 495 | grpc_resolved_address* addr) { |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 496 | memset(addr, 0, sizeof(*addr)); |
Mark D. Roth | e775180 | 2017-07-27 12:31:45 -0700 | [diff] [blame] | 497 | if (server->drop) return; |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 498 | const uint16_t netorder_port = htons(static_cast<uint16_t>(server->port)); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 499 | /* the addresses are given in binary format (a in(6)_addr struct) in |
| 500 | * server->ip_address.bytes. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 501 | const grpc_grpclb_ip_address* ip = &server->ip_address; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 502 | if (ip->size == 4) { |
| 503 | addr->len = sizeof(struct sockaddr_in); |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 504 | struct sockaddr_in* addr4 = |
| 505 | reinterpret_cast<struct sockaddr_in*>(&addr->addr); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 506 | addr4->sin_family = AF_INET; |
| 507 | memcpy(&addr4->sin_addr, ip->bytes, ip->size); |
| 508 | addr4->sin_port = netorder_port; |
| 509 | } else if (ip->size == 16) { |
| 510 | addr->len = sizeof(struct sockaddr_in6); |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 511 | struct sockaddr_in6* addr6 = |
| 512 | reinterpret_cast<struct sockaddr_in6*>(&addr->addr); |
David Garcia Quintas | 107ca16 | 2016-11-02 18:17:03 -0700 | [diff] [blame] | 513 | addr6->sin6_family = AF_INET6; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 514 | memcpy(&addr6->sin6_addr, ip->bytes, ip->size); |
| 515 | addr6->sin6_port = netorder_port; |
| 516 | } |
| 517 | } |
| 518 | |
Mark D. Roth | 7ce14d2 | 2016-09-16 13:03:46 -0700 | [diff] [blame] | 519 | /* Returns addresses extracted from \a serverlist. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 520 | static grpc_lb_addresses* process_serverlist_locked( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 521 | const grpc_grpclb_serverlist* serverlist) { |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 522 | size_t num_valid = 0; |
| 523 | /* first pass: count how many are valid in order to allocate the necessary |
| 524 | * memory in a single block */ |
| 525 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 526 | if (is_server_valid(serverlist->servers[i], i, true)) ++num_valid; |
David Garcia Quintas | b8b384a | 2016-08-23 21:10:29 -0700 | [diff] [blame] | 527 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 528 | grpc_lb_addresses* lb_addresses = |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 529 | grpc_lb_addresses_create(num_valid, &lb_token_vtable); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 530 | /* second pass: actually populate the addresses and LB tokens (aka user data |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 531 | * to the outside world) to be read by the RR policy during its creation. |
| 532 | * Given that the validity tests are very cheap, they are performed again |
| 533 | * instead of marking the valid ones during the first pass, as this would |
| 534 | * incurr in an allocation due to the arbitrary number of server */ |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 535 | size_t addr_idx = 0; |
| 536 | for (size_t sl_idx = 0; sl_idx < serverlist->num_servers; ++sl_idx) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 537 | const grpc_grpclb_server* server = serverlist->servers[sl_idx]; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 538 | if (!is_server_valid(serverlist->servers[sl_idx], sl_idx, false)) continue; |
David Garcia Quintas | c22c65b | 2017-07-25 14:22:20 -0700 | [diff] [blame] | 539 | GPR_ASSERT(addr_idx < num_valid); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 540 | /* address processing */ |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 541 | grpc_resolved_address addr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 542 | parse_server(server, &addr); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 543 | /* lb token processing */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 544 | void* user_data; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 545 | if (server->has_load_balance_token) { |
David Garcia Quintas | 0baf1dc | 2016-10-28 04:44:01 +0200 | [diff] [blame] | 546 | const size_t lb_token_max_length = |
| 547 | GPR_ARRAY_SIZE(server->load_balance_token); |
| 548 | const size_t lb_token_length = |
| 549 | strnlen(server->load_balance_token, lb_token_max_length); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 550 | grpc_slice lb_token_mdstr = grpc_slice_from_copied_buffer( |
| 551 | server->load_balance_token, lb_token_length); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 552 | user_data = |
| 553 | (void*)grpc_mdelem_from_slices(GRPC_MDSTR_LB_TOKEN, lb_token_mdstr) |
| 554 | .payload; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 555 | } else { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 556 | char* uri = grpc_sockaddr_to_uri(&addr); |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame] | 557 | gpr_log(GPR_INFO, |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 558 | "Missing LB token for backend address '%s'. The empty token will " |
| 559 | "be used instead", |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame] | 560 | uri); |
| 561 | gpr_free(uri); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 562 | user_data = (void*)GRPC_MDELEM_LB_TOKEN_EMPTY.payload; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 563 | } |
Mark D. Roth | 64f1f8d | 2016-09-16 09:00:09 -0700 | [diff] [blame] | 564 | grpc_lb_addresses_set_address(lb_addresses, addr_idx, &addr.addr, addr.len, |
| 565 | false /* is_balancer */, |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 566 | nullptr /* balancer_name */, user_data); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 567 | ++addr_idx; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 568 | } |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 569 | GPR_ASSERT(addr_idx == num_valid); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 570 | return lb_addresses; |
| 571 | } |
| 572 | |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 573 | /* Returns the backend addresses extracted from the given addresses */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 574 | static grpc_lb_addresses* extract_backend_addresses_locked( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 575 | const grpc_lb_addresses* addresses) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 576 | /* first pass: count the number of backend addresses */ |
| 577 | size_t num_backends = 0; |
| 578 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 579 | if (!addresses->addresses[i].is_balancer) { |
| 580 | ++num_backends; |
| 581 | } |
| 582 | } |
| 583 | /* second pass: actually populate the addresses and (empty) LB tokens */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 584 | grpc_lb_addresses* backend_addresses = |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 585 | grpc_lb_addresses_create(num_backends, &lb_token_vtable); |
| 586 | size_t num_copied = 0; |
| 587 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 588 | if (addresses->addresses[i].is_balancer) continue; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 589 | const grpc_resolved_address* addr = &addresses->addresses[i].address; |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 590 | grpc_lb_addresses_set_address(backend_addresses, num_copied, &addr->addr, |
| 591 | addr->len, false /* is_balancer */, |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 592 | nullptr /* balancer_name */, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 593 | (void*)GRPC_MDELEM_LB_TOKEN_EMPTY.payload); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 594 | ++num_copied; |
| 595 | } |
| 596 | return backend_addresses; |
| 597 | } |
| 598 | |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 599 | static void update_lb_connectivity_status_locked(glb_lb_policy* glb_policy, |
| 600 | grpc_error* rr_state_error) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 601 | const grpc_connectivity_state curr_glb_state = |
| 602 | grpc_connectivity_state_check(&glb_policy->state_tracker); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 603 | /* The new connectivity status is a function of the previous one and the new |
| 604 | * input coming from the status of the RR policy. |
| 605 | * |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 606 | * current state (grpclb's) |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 607 | * | |
| 608 | * v || I | C | R | TF | SD | <- new state (RR's) |
| 609 | * ===++====+=====+=====+======+======+ |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 610 | * I || I | C | R | [I] | [I] | |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 611 | * ---++----+-----+-----+------+------+ |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 612 | * C || I | C | R | [C] | [C] | |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 613 | * ---++----+-----+-----+------+------+ |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 614 | * R || I | C | R | [R] | [R] | |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 615 | * ---++----+-----+-----+------+------+ |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 616 | * TF || I | C | R | [TF] | [TF] | |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 617 | * ---++----+-----+-----+------+------+ |
| 618 | * SD || NA | NA | NA | NA | NA | (*) |
| 619 | * ---++----+-----+-----+------+------+ |
| 620 | * |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 621 | * A [STATE] indicates that the old RR policy is kept. In those cases, STATE |
| 622 | * is the current state of grpclb, which is left untouched. |
| 623 | * |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 624 | * In summary, if the new state is TRANSIENT_FAILURE or SHUTDOWN, stick to |
| 625 | * the previous RR instance. |
| 626 | * |
| 627 | * Note that the status is never updated to SHUTDOWN as a result of calling |
| 628 | * this function. Only glb_shutdown() has the power to set that state. |
| 629 | * |
| 630 | * (*) This function mustn't be called during shutting down. */ |
| 631 | GPR_ASSERT(curr_glb_state != GRPC_CHANNEL_SHUTDOWN); |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 632 | switch (glb_policy->rr_connectivity_state) { |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 633 | case GRPC_CHANNEL_TRANSIENT_FAILURE: |
| 634 | case GRPC_CHANNEL_SHUTDOWN: |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 635 | GPR_ASSERT(rr_state_error != GRPC_ERROR_NONE); |
| 636 | break; |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 637 | case GRPC_CHANNEL_IDLE: |
| 638 | case GRPC_CHANNEL_CONNECTING: |
| 639 | case GRPC_CHANNEL_READY: |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 640 | GPR_ASSERT(rr_state_error == GRPC_ERROR_NONE); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 641 | } |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 642 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 643 | gpr_log( |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 644 | GPR_INFO, |
| 645 | "[grpclb %p] Setting grpclb's state to %s from new RR policy %p state.", |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 646 | glb_policy, |
| 647 | grpc_connectivity_state_name(glb_policy->rr_connectivity_state), |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 648 | glb_policy->rr_policy); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 649 | } |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 650 | grpc_connectivity_state_set(&glb_policy->state_tracker, |
| 651 | glb_policy->rr_connectivity_state, rr_state_error, |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 652 | "update_lb_connectivity_status_locked"); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 653 | } |
| 654 | |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 655 | /* Perform a pick over \a glb_policy->rr_policy. Given that a pick can return |
| 656 | * immediately (ignoring its completion callback), we need to perform the |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 657 | * cleanups this callback would otherwise be responsible for. |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 658 | * If \a force_async is true, then we will manually schedule the |
| 659 | * completion callback even if the pick is available immediately. */ |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 660 | static bool pick_from_internal_rr_locked(glb_lb_policy* glb_policy, |
| 661 | bool force_async, pending_pick* pp) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 662 | // Check for drops if we are not using fallback backend addresses. |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 663 | if (glb_policy->serverlist != nullptr) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 664 | // Look at the index into the serverlist to see if we should drop this call. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 665 | grpc_grpclb_server* server = |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 666 | glb_policy->serverlist->servers[glb_policy->serverlist_index++]; |
| 667 | if (glb_policy->serverlist_index == glb_policy->serverlist->num_servers) { |
| 668 | glb_policy->serverlist_index = 0; // Wrap-around. |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 669 | } |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 670 | if (server->drop) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 671 | // Update client load reporting stats to indicate the number of |
| 672 | // dropped calls. Note that we have to do this here instead of in |
| 673 | // the client_load_reporting filter, because we do not create a |
| 674 | // subchannel call (and therefore no client_load_reporting filter) |
| 675 | // for dropped calls. |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 676 | if (glb_policy->lb_calld != nullptr && |
| 677 | glb_policy->lb_calld->client_stats != nullptr) { |
| 678 | grpc_grpclb_client_stats_add_call_dropped_locked( |
| 679 | server->load_balance_token, glb_policy->lb_calld->client_stats); |
| 680 | } |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 681 | if (force_async) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 682 | GRPC_CLOSURE_SCHED(pp->original_on_complete, GRPC_ERROR_NONE); |
| 683 | gpr_free(pp); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 684 | return false; |
| 685 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 686 | gpr_free(pp); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 687 | return true; |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 688 | } |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 689 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 690 | // Set client_stats and user_data. |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 691 | if (glb_policy->lb_calld != nullptr && |
| 692 | glb_policy->lb_calld->client_stats != nullptr) { |
| 693 | pp->client_stats = |
| 694 | grpc_grpclb_client_stats_ref(glb_policy->lb_calld->client_stats); |
| 695 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 696 | GPR_ASSERT(pp->pick->user_data == nullptr); |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 697 | pp->pick->user_data = reinterpret_cast<void**>(&pp->lb_token); |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 698 | // Pick via the RR policy. |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 699 | bool pick_done = grpc_lb_policy_pick_locked(glb_policy->rr_policy, pp->pick); |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 700 | if (pick_done) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 701 | pending_pick_set_metadata_and_context(pp); |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 702 | if (force_async) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 703 | GRPC_CLOSURE_SCHED(pp->original_on_complete, GRPC_ERROR_NONE); |
| 704 | pick_done = false; |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 705 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 706 | gpr_free(pp); |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 707 | } |
| 708 | /* else, the pending pick will be registered and taken care of by the |
| 709 | * pending pick list inside the RR policy (glb_policy->rr_policy). |
| 710 | * Eventually, wrapped_on_complete will be called, which will -among other |
| 711 | * things- add the LB token to the call's initial metadata */ |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 712 | return pick_done; |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 713 | } |
| 714 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 715 | static grpc_lb_policy_args* lb_policy_args_create(glb_lb_policy* glb_policy) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 716 | grpc_lb_addresses* addresses; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 717 | if (glb_policy->serverlist != nullptr) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 718 | GPR_ASSERT(glb_policy->serverlist->num_servers > 0); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 719 | addresses = process_serverlist_locked(glb_policy->serverlist); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 720 | } else { |
| 721 | // If rr_handover_locked() is invoked when we haven't received any |
| 722 | // serverlist from the balancer, we use the fallback backends returned by |
| 723 | // the resolver. Note that the fallback backend list may be empty, in which |
| 724 | // case the new round_robin policy will keep the requested picks pending. |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 725 | GPR_ASSERT(glb_policy->fallback_backend_addresses != nullptr); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 726 | addresses = grpc_lb_addresses_copy(glb_policy->fallback_backend_addresses); |
| 727 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 728 | GPR_ASSERT(addresses != nullptr); |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 729 | grpc_lb_policy_args* args = |
| 730 | static_cast<grpc_lb_policy_args*>(gpr_zalloc(sizeof(*args))); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 731 | args->client_channel_factory = glb_policy->cc_factory; |
| 732 | args->combiner = glb_policy->base.combiner; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 733 | // Replace the LB addresses in the channel args that we pass down to |
| 734 | // the subchannel. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 735 | static const char* keys_to_remove[] = {GRPC_ARG_LB_ADDRESSES}; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 736 | const grpc_arg arg = grpc_lb_addresses_create_channel_arg(addresses); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 737 | args->args = grpc_channel_args_copy_and_add_and_remove( |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 738 | glb_policy->args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), &arg, |
| 739 | 1); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 740 | grpc_lb_addresses_destroy(addresses); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 741 | return args; |
| 742 | } |
| 743 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 744 | static void lb_policy_args_destroy(grpc_lb_policy_args* args) { |
| 745 | grpc_channel_args_destroy(args->args); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 746 | gpr_free(args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 747 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 748 | |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 749 | static void rr_on_reresolution_requested_locked(void* arg, grpc_error* error) { |
| 750 | glb_lb_policy* glb_policy = (glb_lb_policy*)arg; |
| 751 | if (glb_policy->shutting_down || error != GRPC_ERROR_NONE) { |
| 752 | GRPC_LB_POLICY_UNREF(&glb_policy->base, |
| 753 | "rr_on_reresolution_requested_locked"); |
| 754 | return; |
| 755 | } |
| 756 | if (grpc_lb_glb_trace.enabled()) { |
| 757 | gpr_log( |
| 758 | GPR_DEBUG, |
| 759 | "[grpclb %p] Re-resolution requested from the internal RR policy (%p).", |
| 760 | glb_policy, glb_policy->rr_policy); |
| 761 | } |
| 762 | // If we are talking to a balancer, we expect to get updated addresses form |
| 763 | // the balancer, so we can ignore the re-resolution request from the RR |
| 764 | // policy. Otherwise, handle the re-resolution request using glb's original |
| 765 | // re-resolution closure. |
| 766 | if (glb_policy->lb_calld == nullptr || |
| 767 | !glb_policy->lb_calld->seen_initial_response) { |
| 768 | grpc_lb_policy_try_reresolve(&glb_policy->base, &grpc_lb_glb_trace, |
| 769 | GRPC_ERROR_NONE); |
| 770 | } |
| 771 | // Give back the wrapper closure to the RR policy. |
| 772 | grpc_lb_policy_set_reresolve_closure_locked( |
| 773 | glb_policy->rr_policy, &glb_policy->rr_on_reresolution_requested); |
| 774 | } |
| 775 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 776 | static void create_rr_locked(glb_lb_policy* glb_policy, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 777 | grpc_lb_policy_args* args) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 778 | GPR_ASSERT(glb_policy->rr_policy == nullptr); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 779 | grpc_lb_policy* new_rr_policy = grpc_lb_policy_create("round_robin", args); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 780 | if (new_rr_policy == nullptr) { |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 781 | gpr_log(GPR_ERROR, |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 782 | "[grpclb %p] Failure creating a RoundRobin policy for serverlist " |
David Garcia Quintas | 2b372e0 | 2017-11-09 14:15:59 -0800 | [diff] [blame] | 783 | "update with %" PRIuPTR |
| 784 | " entries. The previous RR instance (%p), if any, will continue to " |
| 785 | "be used. Future updates from the LB will attempt to create new " |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 786 | "instances.", |
David Garcia Quintas | 2b372e0 | 2017-11-09 14:15:59 -0800 | [diff] [blame] | 787 | glb_policy, glb_policy->serverlist->num_servers, |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 788 | glb_policy->rr_policy); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 789 | return; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 790 | } |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 791 | GRPC_LB_POLICY_REF(&glb_policy->base, "rr_on_reresolution_requested_locked"); |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 792 | grpc_lb_policy_set_reresolve_closure_locked( |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 793 | new_rr_policy, &glb_policy->rr_on_reresolution_requested); |
David Garcia Quintas | 4283a26 | 2016-11-18 10:43:56 -0800 | [diff] [blame] | 794 | glb_policy->rr_policy = new_rr_policy; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 795 | grpc_error* rr_state_error = nullptr; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 796 | glb_policy->rr_connectivity_state = grpc_lb_policy_check_connectivity_locked( |
| 797 | glb_policy->rr_policy, &rr_state_error); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 798 | /* Connectivity state is a function of the RR policy updated/created */ |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 799 | update_lb_connectivity_status_locked(glb_policy, rr_state_error); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 800 | /* Add the gRPC LB's interested_parties pollset_set to that of the newly |
| 801 | * created RR policy. This will make the RR policy progress upon activity on |
| 802 | * gRPC LB, which in turn is tied to the application's call */ |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 803 | grpc_pollset_set_add_pollset_set(glb_policy->rr_policy->interested_parties, |
Yuchen Zeng | b429164 | 2016-09-01 19:17:14 -0700 | [diff] [blame] | 804 | glb_policy->base.interested_parties); |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 805 | /* Subscribe to changes to the connectivity of the new RR */ |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 806 | GRPC_LB_POLICY_REF(&glb_policy->base, "rr_on_connectivity_changed_locked"); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 807 | grpc_lb_policy_notify_on_state_change_locked( |
| 808 | glb_policy->rr_policy, &glb_policy->rr_connectivity_state, |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 809 | &glb_policy->rr_on_connectivity_changed); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 810 | grpc_lb_policy_exit_idle_locked(glb_policy->rr_policy); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 811 | // Send pending picks to RR policy. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 812 | pending_pick* pp; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 813 | while ((pp = glb_policy->pending_picks)) { |
| 814 | glb_policy->pending_picks = pp->next; |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 815 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 816 | gpr_log(GPR_INFO, |
| 817 | "[grpclb %p] Pending pick about to (async) PICK from RR %p", |
| 818 | glb_policy, glb_policy->rr_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 819 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 820 | pick_from_internal_rr_locked(glb_policy, true /* force_async */, pp); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 821 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 822 | // Send pending pings to RR policy. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 823 | pending_ping* pping; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 824 | while ((pping = glb_policy->pending_pings)) { |
| 825 | glb_policy->pending_pings = pping->next; |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 826 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 827 | gpr_log(GPR_INFO, "[grpclb %p] Pending ping about to PING from RR %p", |
| 828 | glb_policy, glb_policy->rr_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 829 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 830 | grpc_lb_policy_ping_one_locked(glb_policy->rr_policy, pping->on_initiate, |
| 831 | pping->on_ack); |
Yuchen Zeng | c272dd7 | 2017-12-05 12:18:34 -0800 | [diff] [blame] | 832 | gpr_free(pping); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 833 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 834 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 835 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 836 | /* glb_policy->rr_policy may be nullptr (initial handover) */ |
| 837 | static void rr_handover_locked(glb_lb_policy* glb_policy) { |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 838 | if (glb_policy->shutting_down) return; |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 839 | grpc_lb_policy_args* args = lb_policy_args_create(glb_policy); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 840 | GPR_ASSERT(args != nullptr); |
| 841 | if (glb_policy->rr_policy != nullptr) { |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 842 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 843 | gpr_log(GPR_DEBUG, "[grpclb %p] Updating RR policy %p", glb_policy, |
| 844 | glb_policy->rr_policy); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 845 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 846 | grpc_lb_policy_update_locked(glb_policy->rr_policy, args); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 847 | } else { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 848 | create_rr_locked(glb_policy, args); |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 849 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 850 | gpr_log(GPR_DEBUG, "[grpclb %p] Created new RR policy %p", glb_policy, |
| 851 | glb_policy->rr_policy); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 852 | } |
| 853 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 854 | lb_policy_args_destroy(args); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 855 | } |
| 856 | |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 857 | static void rr_on_connectivity_changed_locked(void* arg, grpc_error* error) { |
| 858 | glb_lb_policy* glb_policy = (glb_lb_policy*)arg; |
David Garcia Quintas | fc950fb | 2017-07-27 19:41:12 -0700 | [diff] [blame] | 859 | if (glb_policy->shutting_down) { |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 860 | GRPC_LB_POLICY_UNREF(&glb_policy->base, |
| 861 | "rr_on_connectivity_changed_locked"); |
David Garcia Quintas | fc950fb | 2017-07-27 19:41:12 -0700 | [diff] [blame] | 862 | return; |
David Garcia Quintas | 149f09d | 2016-11-17 20:43:10 -0800 | [diff] [blame] | 863 | } |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 864 | update_lb_connectivity_status_locked(glb_policy, GRPC_ERROR_REF(error)); |
| 865 | // Resubscribe. Reuse the "rr_on_connectivity_changed_locked" ref. |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 866 | grpc_lb_policy_notify_on_state_change_locked( |
| 867 | glb_policy->rr_policy, &glb_policy->rr_connectivity_state, |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 868 | &glb_policy->rr_on_connectivity_changed); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 869 | } |
| 870 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 871 | static void destroy_balancer_name(void* balancer_name) { |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 872 | gpr_free(balancer_name); |
| 873 | } |
| 874 | |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 875 | static grpc_slice_hash_table_entry targets_info_entry_create( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 876 | const char* address, const char* balancer_name) { |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 877 | grpc_slice_hash_table_entry entry; |
| 878 | entry.key = grpc_slice_from_copied_string(address); |
Mark D. Roth | e300670 | 2017-04-19 07:43:56 -0700 | [diff] [blame] | 879 | entry.value = gpr_strdup(balancer_name); |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 880 | return entry; |
| 881 | } |
| 882 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 883 | static int balancer_name_cmp_fn(void* a, void* b) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 884 | const char* a_str = static_cast<const char*>(a); |
| 885 | const char* b_str = static_cast<const char*>(b); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 886 | return strcmp(a_str, b_str); |
| 887 | } |
| 888 | |
| 889 | /* Returns the channel args for the LB channel, used to create a bidirectional |
| 890 | * stream for the reception of load balancing updates. |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 891 | * |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 892 | * Inputs: |
| 893 | * - \a addresses: corresponding to the balancers. |
| 894 | * - \a response_generator: in order to propagate updates from the resolver |
| 895 | * above the grpclb policy. |
| 896 | * - \a args: other args inherited from the grpclb policy. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 897 | static grpc_channel_args* build_lb_channel_args( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 898 | const grpc_lb_addresses* addresses, |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 899 | grpc_core::FakeResolverResponseGenerator* response_generator, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 900 | const grpc_channel_args* args) { |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 901 | size_t num_grpclb_addrs = 0; |
| 902 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 903 | if (addresses->addresses[i].is_balancer) ++num_grpclb_addrs; |
| 904 | } |
| 905 | /* All input addresses come from a resolver that claims they are LB services. |
| 906 | * It's the resolver's responsibility to make sure this policy is only |
| 907 | * instantiated and used in that case. Otherwise, something has gone wrong. */ |
| 908 | GPR_ASSERT(num_grpclb_addrs > 0); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 909 | grpc_lb_addresses* lb_addresses = |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 910 | grpc_lb_addresses_create(num_grpclb_addrs, nullptr); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 911 | grpc_slice_hash_table_entry* targets_info_entries = |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 912 | static_cast<grpc_slice_hash_table_entry*>( |
| 913 | gpr_zalloc(sizeof(*targets_info_entries) * num_grpclb_addrs)); |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 914 | |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 915 | size_t lb_addresses_idx = 0; |
| 916 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 917 | if (!addresses->addresses[i].is_balancer) continue; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 918 | if (addresses->addresses[i].user_data != nullptr) { |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 919 | gpr_log(GPR_ERROR, |
| 920 | "This LB policy doesn't support user data. It will be ignored"); |
| 921 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 922 | char* addr_str; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 923 | GPR_ASSERT(grpc_sockaddr_to_string( |
| 924 | &addr_str, &addresses->addresses[i].address, true) > 0); |
| 925 | targets_info_entries[lb_addresses_idx] = targets_info_entry_create( |
| 926 | addr_str, addresses->addresses[i].balancer_name); |
| 927 | gpr_free(addr_str); |
| 928 | |
| 929 | grpc_lb_addresses_set_address( |
| 930 | lb_addresses, lb_addresses_idx++, addresses->addresses[i].address.addr, |
| 931 | addresses->addresses[i].address.len, false /* is balancer */, |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 932 | addresses->addresses[i].balancer_name, nullptr /* user data */); |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 933 | } |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 934 | GPR_ASSERT(num_grpclb_addrs == lb_addresses_idx); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 935 | grpc_slice_hash_table* targets_info = |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 936 | grpc_slice_hash_table_create(num_grpclb_addrs, targets_info_entries, |
| 937 | destroy_balancer_name, balancer_name_cmp_fn); |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 938 | gpr_free(targets_info_entries); |
| 939 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 940 | grpc_channel_args* lb_channel_args = |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 941 | grpc_lb_policy_grpclb_build_lb_channel_args(targets_info, |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 942 | response_generator, args); |
| 943 | |
| 944 | grpc_arg lb_channel_addresses_arg = |
| 945 | grpc_lb_addresses_create_channel_arg(lb_addresses); |
| 946 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 947 | grpc_channel_args* result = grpc_channel_args_copy_and_add( |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 948 | lb_channel_args, &lb_channel_addresses_arg, 1); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 949 | grpc_slice_hash_table_unref(targets_info); |
| 950 | grpc_channel_args_destroy(lb_channel_args); |
| 951 | grpc_lb_addresses_destroy(lb_addresses); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 952 | return result; |
David Garcia Quintas | 0129150 | 2017-02-07 13:26:41 -0800 | [diff] [blame] | 953 | } |
| 954 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 955 | static void glb_destroy(grpc_lb_policy* pol) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 956 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 957 | GPR_ASSERT(glb_policy->pending_picks == nullptr); |
| 958 | GPR_ASSERT(glb_policy->pending_pings == nullptr); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 959 | gpr_free((void*)glb_policy->server_name); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 960 | grpc_channel_args_destroy(glb_policy->args); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 961 | grpc_connectivity_state_destroy(&glb_policy->state_tracker); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 962 | if (glb_policy->serverlist != nullptr) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 963 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
| 964 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 965 | if (glb_policy->fallback_backend_addresses != nullptr) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 966 | grpc_lb_addresses_destroy(glb_policy->fallback_backend_addresses); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 967 | } |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 968 | // TODO(roth): Remove this once the LB policy becomes a C++ object. |
| 969 | glb_policy->response_generator.reset(); |
Juanli Shen | 6502ecc | 2017-09-13 13:10:54 -0700 | [diff] [blame] | 970 | grpc_subchannel_index_unref(); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 971 | gpr_free(glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 972 | } |
| 973 | |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 974 | static void glb_shutdown_locked(grpc_lb_policy* pol, |
| 975 | grpc_lb_policy* new_policy) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 976 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 977 | grpc_error* error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Channel shutdown"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 978 | glb_policy->shutting_down = true; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 979 | if (glb_policy->lb_calld != nullptr) { |
| 980 | lb_call_data_shutdown(glb_policy); |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 981 | } |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 982 | if (glb_policy->retry_timer_callback_pending) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 983 | grpc_timer_cancel(&glb_policy->lb_call_retry_timer); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 984 | } |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 985 | if (glb_policy->fallback_timer_callback_pending) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 986 | grpc_timer_cancel(&glb_policy->lb_fallback_timer); |
Juanli Shen | 663f50c | 2017-10-05 14:36:13 -0700 | [diff] [blame] | 987 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 988 | if (glb_policy->rr_policy != nullptr) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 989 | grpc_lb_policy_shutdown_locked(glb_policy->rr_policy, nullptr); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 990 | GRPC_LB_POLICY_UNREF(glb_policy->rr_policy, "glb_shutdown"); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 991 | } |
| 992 | // We destroy the LB channel here because |
| 993 | // glb_lb_channel_on_connectivity_changed_cb needs a valid glb_policy |
| 994 | // instance. Destroying the lb channel in glb_destroy would likely result in |
| 995 | // a callback invocation without a valid glb_policy arg. |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 996 | if (glb_policy->lb_channel != nullptr) { |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 997 | grpc_channel_destroy(glb_policy->lb_channel); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 998 | glb_policy->lb_channel = nullptr; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 999 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1000 | grpc_connectivity_state_set(&glb_policy->state_tracker, GRPC_CHANNEL_SHUTDOWN, |
| 1001 | GRPC_ERROR_REF(error), "glb_shutdown"); |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 1002 | grpc_lb_policy_try_reresolve(pol, &grpc_lb_glb_trace, GRPC_ERROR_CANCELLED); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1003 | // Clear pending picks. |
| 1004 | pending_pick* pp = glb_policy->pending_picks; |
| 1005 | glb_policy->pending_picks = nullptr; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1006 | while (pp != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1007 | pending_pick* next = pp->next; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1008 | if (new_policy != nullptr) { |
| 1009 | // Hand pick over to new policy. |
Mark D. Roth | 83d5cd6 | 2018-01-11 08:56:53 -0800 | [diff] [blame] | 1010 | if (pp->client_stats != nullptr) { |
| 1011 | grpc_grpclb_client_stats_unref(pp->client_stats); |
| 1012 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1013 | pp->pick->on_complete = pp->original_on_complete; |
| 1014 | if (grpc_lb_policy_pick_locked(new_policy, pp->pick)) { |
| 1015 | // Synchronous return; schedule callback. |
| 1016 | GRPC_CLOSURE_SCHED(pp->pick->on_complete, GRPC_ERROR_NONE); |
| 1017 | } |
| 1018 | gpr_free(pp); |
| 1019 | } else { |
David Garcia Quintas | 269ee29 | 2018-01-12 14:18:37 -0800 | [diff] [blame] | 1020 | pp->pick->connected_subchannel.reset(); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1021 | GRPC_CLOSURE_SCHED(&pp->on_complete, GRPC_ERROR_REF(error)); |
| 1022 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1023 | pp = next; |
| 1024 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1025 | // Clear pending pings. |
| 1026 | pending_ping* pping = glb_policy->pending_pings; |
| 1027 | glb_policy->pending_pings = nullptr; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1028 | while (pping != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1029 | pending_ping* next = pping->next; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1030 | GRPC_CLOSURE_SCHED(pping->on_initiate, GRPC_ERROR_REF(error)); |
| 1031 | GRPC_CLOSURE_SCHED(pping->on_ack, GRPC_ERROR_REF(error)); |
Mark D. Roth | 7a2db96 | 2017-10-06 15:06:12 -0700 | [diff] [blame] | 1032 | gpr_free(pping); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1033 | pping = next; |
| 1034 | } |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 1035 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1036 | } |
| 1037 | |
David Garcia Quintas | c22c65b | 2017-07-25 14:22:20 -0700 | [diff] [blame] | 1038 | // Cancel a specific pending pick. |
| 1039 | // |
| 1040 | // A grpclb pick progresses as follows: |
| 1041 | // - If there's a Round Robin policy (glb_policy->rr_policy) available, it'll be |
| 1042 | // handed over to the RR policy (in create_rr_locked()). From that point |
| 1043 | // onwards, it'll be RR's responsibility. For cancellations, that implies the |
| 1044 | // pick needs also be cancelled by the RR instance. |
| 1045 | // - Otherwise, without an RR instance, picks stay pending at this policy's |
| 1046 | // level (grpclb), inside the glb_policy->pending_picks list. To cancel these, |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1047 | // we invoke the completion closure and set *target to nullptr right here. |
| 1048 | static void glb_cancel_pick_locked(grpc_lb_policy* pol, |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1049 | grpc_lb_policy_pick_state* pick, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1050 | grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1051 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1052 | pending_pick* pp = glb_policy->pending_picks; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1053 | glb_policy->pending_picks = nullptr; |
| 1054 | while (pp != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1055 | pending_pick* next = pp->next; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1056 | if (pp->pick == pick) { |
David Garcia Quintas | 269ee29 | 2018-01-12 14:18:37 -0800 | [diff] [blame] | 1057 | pick->connected_subchannel.reset(); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1058 | GRPC_CLOSURE_SCHED(&pp->on_complete, |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 1059 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 1060 | "Pick Cancelled", &error, 1)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1061 | } else { |
| 1062 | pp->next = glb_policy->pending_picks; |
| 1063 | glb_policy->pending_picks = pp; |
| 1064 | } |
| 1065 | pp = next; |
| 1066 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1067 | if (glb_policy->rr_policy != nullptr) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1068 | grpc_lb_policy_cancel_pick_locked(glb_policy->rr_policy, pick, |
David Garcia Quintas | c22c65b | 2017-07-25 14:22:20 -0700 | [diff] [blame] | 1069 | GRPC_ERROR_REF(error)); |
| 1070 | } |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 1071 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
David Garcia Quintas | c22c65b | 2017-07-25 14:22:20 -0700 | [diff] [blame] | 1074 | // Cancel all pending picks. |
| 1075 | // |
| 1076 | // A grpclb pick progresses as follows: |
| 1077 | // - If there's a Round Robin policy (glb_policy->rr_policy) available, it'll be |
| 1078 | // handed over to the RR policy (in create_rr_locked()). From that point |
| 1079 | // onwards, it'll be RR's responsibility. For cancellations, that implies the |
| 1080 | // pick needs also be cancelled by the RR instance. |
| 1081 | // - Otherwise, without an RR instance, picks stay pending at this policy's |
| 1082 | // level (grpclb), inside the glb_policy->pending_picks list. To cancel these, |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1083 | // we invoke the completion closure and set *target to nullptr right here. |
| 1084 | static void glb_cancel_picks_locked(grpc_lb_policy* pol, |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 1085 | uint32_t initial_metadata_flags_mask, |
| 1086 | uint32_t initial_metadata_flags_eq, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1087 | grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1088 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1089 | pending_pick* pp = glb_policy->pending_picks; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1090 | glb_policy->pending_picks = nullptr; |
| 1091 | while (pp != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1092 | pending_pick* next = pp->next; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1093 | if ((pp->pick->initial_metadata_flags & initial_metadata_flags_mask) == |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1094 | initial_metadata_flags_eq) { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1095 | GRPC_CLOSURE_SCHED(&pp->on_complete, |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 1096 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 1097 | "Pick Cancelled", &error, 1)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1098 | } else { |
| 1099 | pp->next = glb_policy->pending_picks; |
| 1100 | glb_policy->pending_picks = pp; |
| 1101 | } |
| 1102 | pp = next; |
| 1103 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1104 | if (glb_policy->rr_policy != nullptr) { |
David Garcia Quintas | c22c65b | 2017-07-25 14:22:20 -0700 | [diff] [blame] | 1105 | grpc_lb_policy_cancel_picks_locked( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1106 | glb_policy->rr_policy, initial_metadata_flags_mask, |
David Garcia Quintas | c22c65b | 2017-07-25 14:22:20 -0700 | [diff] [blame] | 1107 | initial_metadata_flags_eq, GRPC_ERROR_REF(error)); |
| 1108 | } |
Mark D. Roth | e65ff11 | 2016-09-09 13:48:38 -0700 | [diff] [blame] | 1109 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1110 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1111 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1112 | static void lb_on_fallback_timer_locked(void* arg, grpc_error* error); |
| 1113 | static void query_for_backends_locked(glb_lb_policy* glb_policy); |
| 1114 | static void start_picking_locked(glb_lb_policy* glb_policy) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1115 | /* start a timer to fall back */ |
| 1116 | if (glb_policy->lb_fallback_timeout_ms > 0 && |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 1117 | glb_policy->serverlist == nullptr && |
| 1118 | !glb_policy->fallback_timer_callback_pending) { |
Craig Tiller | 1e868f0 | 2017-09-29 11:18:26 -0700 | [diff] [blame] | 1119 | grpc_millis deadline = |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1120 | grpc_core::ExecCtx::Get()->Now() + glb_policy->lb_fallback_timeout_ms; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1121 | GRPC_LB_POLICY_REF(&glb_policy->base, "grpclb_fallback_timer"); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1122 | GRPC_CLOSURE_INIT(&glb_policy->lb_on_fallback, lb_on_fallback_timer_locked, |
| 1123 | glb_policy, |
| 1124 | grpc_combiner_scheduler(glb_policy->base.combiner)); |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 1125 | glb_policy->fallback_timer_callback_pending = true; |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1126 | grpc_timer_init(&glb_policy->lb_fallback_timer, deadline, |
Craig Tiller | 1e868f0 | 2017-09-29 11:18:26 -0700 | [diff] [blame] | 1127 | &glb_policy->lb_on_fallback); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1128 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1129 | glb_policy->started_picking = true; |
David Garcia Quintas | dde6afc | 2017-11-22 16:31:01 -0800 | [diff] [blame] | 1130 | glb_policy->lb_call_backoff->Reset(); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1131 | query_for_backends_locked(glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1132 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1133 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1134 | static void glb_exit_idle_locked(grpc_lb_policy* pol) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1135 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1136 | if (!glb_policy->started_picking) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1137 | start_picking_locked(glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1138 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1139 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1140 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1141 | static int glb_pick_locked(grpc_lb_policy* pol, |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1142 | grpc_lb_policy_pick_state* pick) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1143 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1144 | pending_pick* pp = pending_pick_create(glb_policy, pick); |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1145 | bool pick_done = false; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1146 | if (glb_policy->rr_policy != nullptr) { |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1147 | const grpc_connectivity_state rr_connectivity_state = |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1148 | grpc_lb_policy_check_connectivity_locked(glb_policy->rr_policy, |
| 1149 | nullptr); |
David Garcia Quintas | f6c6b92 | 2017-11-03 07:48:16 -0700 | [diff] [blame] | 1150 | // The glb_policy->rr_policy may have transitioned to SHUTDOWN but the |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1151 | // callback registered to capture this event |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1152 | // (on_rr_connectivity_changed_locked) may not have been invoked yet. We |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1153 | // need to make sure we aren't trying to pick from a RR policy instance |
| 1154 | // that's in shutdown. |
| 1155 | if (rr_connectivity_state == GRPC_CHANNEL_SHUTDOWN) { |
ncteisen | 72afb76 | 2017-11-10 12:23:12 -0800 | [diff] [blame] | 1156 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1157 | gpr_log(GPR_INFO, |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1158 | "[grpclb %p] NOT picking from from RR %p: RR conn state=%s", |
| 1159 | glb_policy, glb_policy->rr_policy, |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1160 | grpc_connectivity_state_name(rr_connectivity_state)); |
| 1161 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1162 | pending_pick_add(&glb_policy->pending_picks, pp); |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1163 | pick_done = false; |
| 1164 | } else { // RR not in shutdown |
ncteisen | 72afb76 | 2017-11-10 12:23:12 -0800 | [diff] [blame] | 1165 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1166 | gpr_log(GPR_INFO, "[grpclb %p] about to PICK from RR %p", glb_policy, |
| 1167 | glb_policy->rr_policy); |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1168 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1169 | pick_done = |
| 1170 | pick_from_internal_rr_locked(glb_policy, false /* force_async */, pp); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1171 | } |
David Garcia Quintas | 2a95bf4 | 2017-09-07 11:26:34 -0700 | [diff] [blame] | 1172 | } else { // glb_policy->rr_policy == NULL |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 1173 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1174 | gpr_log(GPR_DEBUG, |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1175 | "[grpclb %p] No RR policy. Adding to grpclb's pending picks", |
| 1176 | glb_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1177 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1178 | pending_pick_add(&glb_policy->pending_picks, pp); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1179 | if (!glb_policy->started_picking) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1180 | start_picking_locked(glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1181 | } |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 1182 | pick_done = false; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1183 | } |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 1184 | return pick_done; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1185 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1186 | |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 1187 | static grpc_connectivity_state glb_check_connectivity_locked( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1188 | grpc_lb_policy* pol, grpc_error** connectivity_error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1189 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 1190 | return grpc_connectivity_state_get(&glb_policy->state_tracker, |
| 1191 | connectivity_error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1192 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1193 | |
Yash Tibrewal | d6c292f | 2017-12-07 19:38:43 -0800 | [diff] [blame] | 1194 | static void glb_ping_one_locked(grpc_lb_policy* pol, grpc_closure* on_initiate, |
Yuchen Zeng | c272dd7 | 2017-12-05 12:18:34 -0800 | [diff] [blame] | 1195 | grpc_closure* on_ack) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1196 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1197 | if (glb_policy->rr_policy) { |
Yash Tibrewal | d6c292f | 2017-12-07 19:38:43 -0800 | [diff] [blame] | 1198 | grpc_lb_policy_ping_one_locked(glb_policy->rr_policy, on_initiate, on_ack); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1199 | } else { |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1200 | pending_ping_add(&glb_policy->pending_pings, on_initiate, on_ack); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1201 | if (!glb_policy->started_picking) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1202 | start_picking_locked(glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1203 | } |
| 1204 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1205 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1206 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1207 | static void glb_notify_on_state_change_locked(grpc_lb_policy* pol, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1208 | grpc_connectivity_state* current, |
| 1209 | grpc_closure* notify) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1210 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(pol); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1211 | grpc_connectivity_state_notify_on_state_change(&glb_policy->state_tracker, |
| 1212 | current, notify); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1213 | } |
| 1214 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1215 | static void lb_call_on_retry_timer_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1216 | glb_lb_policy* glb_policy = static_cast<glb_lb_policy*>(arg); |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 1217 | glb_policy->retry_timer_callback_pending = false; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1218 | if (!glb_policy->shutting_down && error == GRPC_ERROR_NONE && |
| 1219 | glb_policy->lb_calld == nullptr) { |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 1220 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | 2b372e0 | 2017-11-09 14:15:59 -0800 | [diff] [blame] | 1221 | gpr_log(GPR_INFO, "[grpclb %p] Restarting call to LB server", glb_policy); |
Mark D. Roth | a4792f5 | 2017-09-26 09:06:35 -0700 | [diff] [blame] | 1222 | } |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1223 | query_for_backends_locked(glb_policy); |
Mark D. Roth | a4792f5 | 2017-09-26 09:06:35 -0700 | [diff] [blame] | 1224 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1225 | GRPC_LB_POLICY_UNREF(&glb_policy->base, "grpclb_retry_timer"); |
Mark D. Roth | a4792f5 | 2017-09-26 09:06:35 -0700 | [diff] [blame] | 1226 | } |
| 1227 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1228 | static void start_lb_call_retry_timer_locked(glb_lb_policy* glb_policy) { |
| 1229 | grpc_millis next_try = glb_policy->lb_call_backoff->NextAttemptTime(); |
| 1230 | if (grpc_lb_glb_trace.enabled()) { |
| 1231 | gpr_log(GPR_DEBUG, "[grpclb %p] Connection to LB server lost...", |
| 1232 | glb_policy); |
| 1233 | grpc_millis timeout = next_try - grpc_core::ExecCtx::Get()->Now(); |
| 1234 | if (timeout > 0) { |
| 1235 | gpr_log(GPR_DEBUG, |
| 1236 | "[grpclb %p] ... retry_timer_active in %" PRIuPTR "ms.", |
| 1237 | glb_policy, timeout); |
| 1238 | } else { |
| 1239 | gpr_log(GPR_DEBUG, "[grpclb %p] ... retry_timer_active immediately.", |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1240 | glb_policy); |
Mark D. Roth | a4792f5 | 2017-09-26 09:06:35 -0700 | [diff] [blame] | 1241 | } |
Mark D. Roth | a4792f5 | 2017-09-26 09:06:35 -0700 | [diff] [blame] | 1242 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1243 | GRPC_LB_POLICY_REF(&glb_policy->base, "grpclb_retry_timer"); |
| 1244 | GRPC_CLOSURE_INIT(&glb_policy->lb_on_call_retry, |
| 1245 | lb_call_on_retry_timer_locked, glb_policy, |
| 1246 | grpc_combiner_scheduler(glb_policy->base.combiner)); |
| 1247 | glb_policy->retry_timer_callback_pending = true; |
| 1248 | grpc_timer_init(&glb_policy->lb_call_retry_timer, next_try, |
| 1249 | &glb_policy->lb_on_call_retry); |
Mark D. Roth | a4792f5 | 2017-09-26 09:06:35 -0700 | [diff] [blame] | 1250 | } |
| 1251 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1252 | static void maybe_send_client_load_report_locked(void* arg, grpc_error* error); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1253 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1254 | static void schedule_next_client_load_report(glb_lb_call_data* lb_calld) { |
Craig Tiller | c0df1c0 | 2017-07-17 16:12:33 -0700 | [diff] [blame] | 1255 | const grpc_millis next_client_load_report_time = |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1256 | grpc_core::ExecCtx::Get()->Now() + lb_calld->client_stats_report_interval; |
| 1257 | GRPC_CLOSURE_INIT( |
| 1258 | &lb_calld->client_load_report_closure, |
| 1259 | maybe_send_client_load_report_locked, lb_calld, |
| 1260 | grpc_combiner_scheduler(lb_calld->glb_policy->base.combiner)); |
| 1261 | grpc_timer_init(&lb_calld->client_load_report_timer, |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1262 | next_client_load_report_time, |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1263 | &lb_calld->client_load_report_closure); |
| 1264 | lb_calld->client_load_report_timer_callback_pending = true; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1267 | static void client_load_report_done_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1268 | glb_lb_call_data* lb_calld = static_cast<glb_lb_call_data*>(arg); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1269 | glb_lb_policy* glb_policy = lb_calld->glb_policy; |
| 1270 | grpc_byte_buffer_destroy(lb_calld->send_message_payload); |
| 1271 | lb_calld->send_message_payload = nullptr; |
| 1272 | if (error != GRPC_ERROR_NONE || lb_calld != glb_policy->lb_calld) { |
| 1273 | glb_lb_call_data_unref(lb_calld, "client_load_report"); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1274 | return; |
| 1275 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1276 | schedule_next_client_load_report(lb_calld); |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1277 | } |
| 1278 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1279 | static bool load_report_counters_are_zero(grpc_grpclb_request* request) { |
| 1280 | grpc_grpclb_dropped_call_counts* drop_entries = |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 1281 | static_cast<grpc_grpclb_dropped_call_counts*>( |
| 1282 | request->client_stats.calls_finished_with_drop.arg); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1283 | return request->client_stats.num_calls_started == 0 && |
| 1284 | request->client_stats.num_calls_finished == 0 && |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1285 | request->client_stats.num_calls_finished_with_client_failed_to_send == |
| 1286 | 0 && |
Mark D. Roth | e775180 | 2017-07-27 12:31:45 -0700 | [diff] [blame] | 1287 | request->client_stats.num_calls_finished_known_received == 0 && |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1288 | (drop_entries == nullptr || drop_entries->num_entries == 0); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1289 | } |
| 1290 | |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1291 | static void send_client_load_report_locked(glb_lb_call_data* lb_calld) { |
| 1292 | glb_lb_policy* glb_policy = lb_calld->glb_policy; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1293 | // Construct message payload. |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1294 | GPR_ASSERT(lb_calld->send_message_payload == nullptr); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1295 | grpc_grpclb_request* request = |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1296 | grpc_grpclb_load_report_request_create_locked(lb_calld->client_stats); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1297 | // Skip client load report if the counters were all zero in the last |
| 1298 | // report and they are still zero in this one. |
| 1299 | if (load_report_counters_are_zero(request)) { |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1300 | if (lb_calld->last_client_load_report_counters_were_zero) { |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1301 | grpc_grpclb_request_destroy(request); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1302 | schedule_next_client_load_report(lb_calld); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1303 | return; |
| 1304 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1305 | lb_calld->last_client_load_report_counters_were_zero = true; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1306 | } else { |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1307 | lb_calld->last_client_load_report_counters_were_zero = false; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1308 | } |
| 1309 | grpc_slice request_payload_slice = grpc_grpclb_request_encode(request); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1310 | lb_calld->send_message_payload = |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1311 | grpc_raw_byte_buffer_create(&request_payload_slice, 1); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1312 | grpc_slice_unref_internal(request_payload_slice); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1313 | grpc_grpclb_request_destroy(request); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1314 | // Send the report. |
| 1315 | grpc_op op; |
| 1316 | memset(&op, 0, sizeof(op)); |
| 1317 | op.op = GRPC_OP_SEND_MESSAGE; |
| 1318 | op.data.send_message.send_message = lb_calld->send_message_payload; |
| 1319 | GRPC_CLOSURE_INIT(&lb_calld->client_load_report_closure, |
| 1320 | client_load_report_done_locked, lb_calld, |
| 1321 | grpc_combiner_scheduler(glb_policy->base.combiner)); |
| 1322 | grpc_call_error call_error = grpc_call_start_batch_and_execute( |
| 1323 | lb_calld->lb_call, &op, 1, &lb_calld->client_load_report_closure); |
| 1324 | if (call_error != GRPC_CALL_OK) { |
| 1325 | gpr_log(GPR_ERROR, "[grpclb %p] call_error=%d", glb_policy, call_error); |
| 1326 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 1327 | } |
| 1328 | } |
| 1329 | |
| 1330 | static void maybe_send_client_load_report_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1331 | glb_lb_call_data* lb_calld = static_cast<glb_lb_call_data*>(arg); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1332 | glb_lb_policy* glb_policy = lb_calld->glb_policy; |
| 1333 | lb_calld->client_load_report_timer_callback_pending = false; |
| 1334 | if (error != GRPC_ERROR_NONE || lb_calld != glb_policy->lb_calld) { |
| 1335 | glb_lb_call_data_unref(lb_calld, "client_load_report"); |
| 1336 | return; |
| 1337 | } |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1338 | // If we've already sent the initial request, then we can go ahead and send |
| 1339 | // the load report. Otherwise, we need to wait until the initial request has |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1340 | // been sent to send this (see lb_on_sent_initial_request_locked()). |
| 1341 | if (lb_calld->send_message_payload == nullptr) { |
| 1342 | send_client_load_report_locked(lb_calld); |
| 1343 | } else { |
| 1344 | lb_calld->client_load_report_is_due = true; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1345 | } |
| 1346 | } |
| 1347 | |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1348 | static void lb_on_sent_initial_request_locked(void* arg, grpc_error* error); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1349 | static void lb_on_server_status_received_locked(void* arg, grpc_error* error); |
| 1350 | static void lb_on_response_received_locked(void* arg, grpc_error* error); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1351 | static glb_lb_call_data* lb_call_data_create_locked(glb_lb_policy* glb_policy) { |
| 1352 | GPR_ASSERT(!glb_policy->shutting_down); |
| 1353 | // Init the LB call. Note that the LB call will progress every time there's |
| 1354 | // activity in glb_policy->base.interested_parties, which is comprised of the |
| 1355 | // polling entities from client_channel. |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1356 | GPR_ASSERT(glb_policy->server_name != nullptr); |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 1357 | GPR_ASSERT(glb_policy->server_name[0] != '\0'); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1358 | grpc_slice host = grpc_slice_from_copied_string(glb_policy->server_name); |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 1359 | grpc_millis deadline = |
Mark D. Roth | 64d922a | 2017-05-03 12:52:04 -0700 | [diff] [blame] | 1360 | glb_policy->lb_call_timeout_ms == 0 |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 1361 | ? GRPC_MILLIS_INF_FUTURE |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1362 | : grpc_core::ExecCtx::Get()->Now() + glb_policy->lb_call_timeout_ms; |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 1363 | glb_lb_call_data* lb_calld = |
| 1364 | static_cast<glb_lb_call_data*>(gpr_zalloc(sizeof(*lb_calld))); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1365 | lb_calld->lb_call = grpc_channel_create_pollset_set_call( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1366 | glb_policy->lb_channel, nullptr, GRPC_PROPAGATE_DEFAULTS, |
David Garcia Quintas | 4543e5c | 2016-09-22 15:09:34 -0700 | [diff] [blame] | 1367 | glb_policy->base.interested_parties, |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1368 | GRPC_MDSTR_SLASH_GRPC_DOT_LB_DOT_V1_DOT_LOADBALANCER_SLASH_BALANCELOAD, |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1369 | &host, deadline, nullptr); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1370 | grpc_slice_unref_internal(host); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1371 | // Init the LB call request payload. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1372 | grpc_grpclb_request* request = |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 1373 | grpc_grpclb_request_create(glb_policy->server_name); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 1374 | grpc_slice request_payload_slice = grpc_grpclb_request_encode(request); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1375 | lb_calld->send_message_payload = |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1376 | grpc_raw_byte_buffer_create(&request_payload_slice, 1); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1377 | grpc_slice_unref_internal(request_payload_slice); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1378 | grpc_grpclb_request_destroy(request); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1379 | // Init other data associated with the LB call. |
| 1380 | lb_calld->glb_policy = glb_policy; |
| 1381 | gpr_ref_init(&lb_calld->refs, 1); |
| 1382 | grpc_metadata_array_init(&lb_calld->lb_initial_metadata_recv); |
| 1383 | grpc_metadata_array_init(&lb_calld->lb_trailing_metadata_recv); |
| 1384 | GRPC_CLOSURE_INIT(&lb_calld->lb_on_sent_initial_request, |
| 1385 | lb_on_sent_initial_request_locked, lb_calld, |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1386 | grpc_combiner_scheduler(glb_policy->base.combiner)); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1387 | GRPC_CLOSURE_INIT(&lb_calld->lb_on_response_received, |
| 1388 | lb_on_response_received_locked, lb_calld, |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 1389 | grpc_combiner_scheduler(glb_policy->base.combiner)); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1390 | GRPC_CLOSURE_INIT(&lb_calld->lb_on_server_status_received, |
| 1391 | lb_on_server_status_received_locked, lb_calld, |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 1392 | grpc_combiner_scheduler(glb_policy->base.combiner)); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1393 | // Hold a ref to the glb_policy. |
| 1394 | GRPC_LB_POLICY_REF(&glb_policy->base, "lb_calld"); |
| 1395 | return lb_calld; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1396 | } |
| 1397 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1398 | /* |
| 1399 | * Auxiliary functions and LB client callbacks. |
| 1400 | */ |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1401 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1402 | static void query_for_backends_locked(glb_lb_policy* glb_policy) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1403 | GPR_ASSERT(glb_policy->lb_channel != nullptr); |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 1404 | if (glb_policy->shutting_down) return; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1405 | // Init the LB call data. |
| 1406 | GPR_ASSERT(glb_policy->lb_calld == nullptr); |
| 1407 | glb_policy->lb_calld = lb_call_data_create_locked(glb_policy); |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 1408 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1409 | gpr_log(GPR_INFO, |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1410 | "[grpclb %p] Query for backends (lb_channel: %p, lb_calld: %p, " |
| 1411 | "lb_call: %p)", |
| 1412 | glb_policy, glb_policy->lb_channel, glb_policy->lb_calld, |
| 1413 | glb_policy->lb_calld->lb_call); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1414 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1415 | GPR_ASSERT(glb_policy->lb_calld->lb_call != nullptr); |
| 1416 | // Create the ops. |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1417 | grpc_call_error call_error; |
Mark D. Roth | 2de36a8 | 2017-09-25 14:54:44 -0700 | [diff] [blame] | 1418 | grpc_op ops[3]; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1419 | memset(ops, 0, sizeof(ops)); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1420 | // Op: send initial metadata. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1421 | grpc_op* op = ops; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1422 | op->op = GRPC_OP_SEND_INITIAL_METADATA; |
| 1423 | op->data.send_initial_metadata.count = 0; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1424 | op->flags = 0; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1425 | op->reserved = nullptr; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1426 | op++; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1427 | // Op: send request message. |
| 1428 | GPR_ASSERT(glb_policy->lb_calld->send_message_payload != nullptr); |
| 1429 | op->op = GRPC_OP_SEND_MESSAGE; |
| 1430 | op->data.send_message.send_message = |
| 1431 | glb_policy->lb_calld->send_message_payload; |
| 1432 | op->flags = 0; |
| 1433 | op->reserved = nullptr; |
| 1434 | op++; |
| 1435 | glb_lb_call_data_ref(glb_policy->lb_calld, |
| 1436 | "lb_on_sent_initial_request_locked"); |
| 1437 | call_error = grpc_call_start_batch_and_execute( |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1438 | glb_policy->lb_calld->lb_call, ops, static_cast<size_t>(op - ops), |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1439 | &glb_policy->lb_calld->lb_on_sent_initial_request); |
| 1440 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 1441 | // Op: recv initial metadata. |
| 1442 | op = ops; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1443 | op->op = GRPC_OP_RECV_INITIAL_METADATA; |
Mark D. Roth | 448c1f0 | 2017-01-25 10:44:30 -0800 | [diff] [blame] | 1444 | op->data.recv_initial_metadata.recv_initial_metadata = |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1445 | &glb_policy->lb_calld->lb_initial_metadata_recv; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1446 | op->flags = 0; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1447 | op->reserved = nullptr; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1448 | op++; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1449 | // Op: recv response. |
| 1450 | op->op = GRPC_OP_RECV_MESSAGE; |
| 1451 | op->data.recv_message.recv_message = |
| 1452 | &glb_policy->lb_calld->recv_message_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1453 | op->flags = 0; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1454 | op->reserved = nullptr; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1455 | op++; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1456 | glb_lb_call_data_ref(glb_policy->lb_calld, "lb_on_response_received_locked"); |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1457 | call_error = grpc_call_start_batch_and_execute( |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1458 | glb_policy->lb_calld->lb_call, ops, static_cast<size_t>(op - ops), |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1459 | &glb_policy->lb_calld->lb_on_response_received); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1460 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1461 | // Op: recv server status. |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1462 | op = ops; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1463 | op->op = GRPC_OP_RECV_STATUS_ON_CLIENT; |
| 1464 | op->data.recv_status_on_client.trailing_metadata = |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1465 | &glb_policy->lb_calld->lb_trailing_metadata_recv; |
| 1466 | op->data.recv_status_on_client.status = &glb_policy->lb_calld->lb_call_status; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1467 | op->data.recv_status_on_client.status_details = |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1468 | &glb_policy->lb_calld->lb_call_status_details; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1469 | op->flags = 0; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1470 | op->reserved = nullptr; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1471 | op++; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1472 | // This callback signals the end of the LB call, so it relies on the initial |
| 1473 | // ref instead of a new ref. When it's invoked, it's the initial ref that is |
| 1474 | // unreffed. |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1475 | call_error = grpc_call_start_batch_and_execute( |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1476 | glb_policy->lb_calld->lb_call, ops, static_cast<size_t>(op - ops), |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1477 | &glb_policy->lb_calld->lb_on_server_status_received); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 1478 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1479 | } |
| 1480 | |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1481 | static void lb_on_sent_initial_request_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1482 | glb_lb_call_data* lb_calld = static_cast<glb_lb_call_data*>(arg); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1483 | grpc_byte_buffer_destroy(lb_calld->send_message_payload); |
| 1484 | lb_calld->send_message_payload = nullptr; |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1485 | // If we attempted to send a client load report before the initial request was |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1486 | // sent (and this lb_calld is still in use), send the load report now. |
| 1487 | if (lb_calld->client_load_report_is_due && |
| 1488 | lb_calld == lb_calld->glb_policy->lb_calld) { |
| 1489 | send_client_load_report_locked(lb_calld); |
| 1490 | lb_calld->client_load_report_is_due = false; |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1491 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1492 | glb_lb_call_data_unref(lb_calld, "lb_on_sent_initial_request_locked"); |
Juanli Shen | f2a0ae7 | 2017-12-27 16:08:12 -0800 | [diff] [blame] | 1493 | } |
| 1494 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1495 | static void lb_on_response_received_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1496 | glb_lb_call_data* lb_calld = static_cast<glb_lb_call_data*>(arg); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1497 | glb_lb_policy* glb_policy = lb_calld->glb_policy; |
| 1498 | // Empty payload means the LB call was cancelled. |
| 1499 | if (lb_calld != glb_policy->lb_calld || |
| 1500 | lb_calld->recv_message_payload == nullptr) { |
| 1501 | glb_lb_call_data_unref(lb_calld, "lb_on_response_received_locked"); |
| 1502 | return; |
| 1503 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1504 | grpc_op ops[2]; |
| 1505 | memset(ops, 0, sizeof(ops)); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1506 | grpc_op* op = ops; |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1507 | glb_policy->lb_call_backoff->Reset(); |
| 1508 | grpc_byte_buffer_reader bbr; |
| 1509 | grpc_byte_buffer_reader_init(&bbr, lb_calld->recv_message_payload); |
| 1510 | grpc_slice response_slice = grpc_byte_buffer_reader_readall(&bbr); |
| 1511 | grpc_byte_buffer_reader_destroy(&bbr); |
| 1512 | grpc_byte_buffer_destroy(lb_calld->recv_message_payload); |
| 1513 | lb_calld->recv_message_payload = nullptr; |
| 1514 | grpc_grpclb_initial_response* initial_response; |
| 1515 | grpc_grpclb_serverlist* serverlist; |
| 1516 | if (!lb_calld->seen_initial_response && |
| 1517 | (initial_response = grpc_grpclb_initial_response_parse(response_slice)) != |
| 1518 | nullptr) { |
| 1519 | // Have NOT seen initial response, look for initial response. |
| 1520 | if (initial_response->has_client_stats_report_interval) { |
| 1521 | lb_calld->client_stats_report_interval = GPR_MAX( |
| 1522 | GPR_MS_PER_SEC, grpc_grpclb_duration_to_millis( |
| 1523 | &initial_response->client_stats_report_interval)); |
| 1524 | if (grpc_lb_glb_trace.enabled()) { |
| 1525 | gpr_log(GPR_INFO, |
| 1526 | "[grpclb %p] Received initial LB response message; " |
| 1527 | "client load reporting interval = %" PRIdPTR " milliseconds", |
| 1528 | glb_policy, lb_calld->client_stats_report_interval); |
| 1529 | } |
| 1530 | } else if (grpc_lb_glb_trace.enabled()) { |
| 1531 | gpr_log(GPR_INFO, |
| 1532 | "[grpclb %p] Received initial LB response message; client load " |
| 1533 | "reporting NOT enabled", |
| 1534 | glb_policy); |
| 1535 | } |
| 1536 | grpc_grpclb_initial_response_destroy(initial_response); |
| 1537 | lb_calld->seen_initial_response = true; |
| 1538 | } else if ((serverlist = grpc_grpclb_response_parse_serverlist( |
| 1539 | response_slice)) != nullptr) { |
| 1540 | // Have seen initial response, look for serverlist. |
| 1541 | GPR_ASSERT(lb_calld->lb_call != nullptr); |
| 1542 | if (grpc_lb_glb_trace.enabled()) { |
| 1543 | gpr_log(GPR_INFO, |
| 1544 | "[grpclb %p] Serverlist with %" PRIuPTR " servers received", |
| 1545 | glb_policy, serverlist->num_servers); |
| 1546 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
| 1547 | grpc_resolved_address addr; |
| 1548 | parse_server(serverlist->servers[i], &addr); |
| 1549 | char* ipport; |
| 1550 | grpc_sockaddr_to_string(&ipport, &addr, false); |
| 1551 | gpr_log(GPR_INFO, "[grpclb %p] Serverlist[%" PRIuPTR "]: %s", |
| 1552 | glb_policy, i, ipport); |
| 1553 | gpr_free(ipport); |
| 1554 | } |
| 1555 | } |
| 1556 | /* update serverlist */ |
| 1557 | if (serverlist->num_servers > 0) { |
| 1558 | // Start sending client load report only after we start using the |
| 1559 | // serverlist returned from the current LB call. |
| 1560 | if (lb_calld->client_stats_report_interval > 0 && |
| 1561 | lb_calld->client_stats == nullptr) { |
| 1562 | lb_calld->client_stats = grpc_grpclb_client_stats_create(); |
| 1563 | glb_lb_call_data_ref(lb_calld, "client_load_report"); |
| 1564 | schedule_next_client_load_report(lb_calld); |
| 1565 | } |
| 1566 | if (grpc_grpclb_serverlist_equals(glb_policy->serverlist, serverlist)) { |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 1567 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1568 | gpr_log(GPR_INFO, |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1569 | "[grpclb %p] Incoming server list identical to current, " |
| 1570 | "ignoring.", |
| 1571 | glb_policy); |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1572 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1573 | grpc_grpclb_destroy_serverlist(serverlist); |
| 1574 | } else { /* new serverlist */ |
| 1575 | if (glb_policy->serverlist != nullptr) { |
| 1576 | /* dispose of the old serverlist */ |
| 1577 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
| 1578 | } else { |
| 1579 | /* or dispose of the fallback */ |
| 1580 | grpc_lb_addresses_destroy(glb_policy->fallback_backend_addresses); |
| 1581 | glb_policy->fallback_backend_addresses = nullptr; |
| 1582 | if (glb_policy->fallback_timer_callback_pending) { |
| 1583 | grpc_timer_cancel(&glb_policy->lb_fallback_timer); |
| 1584 | glb_policy->fallback_timer_callback_pending = false; |
| 1585 | } |
| 1586 | } |
| 1587 | /* and update the copy in the glb_lb_policy instance. This |
| 1588 | * serverlist instance will be destroyed either upon the next |
| 1589 | * update or in glb_destroy() */ |
| 1590 | glb_policy->serverlist = serverlist; |
| 1591 | glb_policy->serverlist_index = 0; |
| 1592 | rr_handover_locked(glb_policy); |
| 1593 | } |
| 1594 | } else { |
| 1595 | if (grpc_lb_glb_trace.enabled()) { |
| 1596 | gpr_log(GPR_INFO, "[grpclb %p] Received empty server list, ignoring.", |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1597 | glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1598 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1599 | grpc_grpclb_destroy_serverlist(serverlist); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1600 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1601 | } else { |
| 1602 | // No valid initial response or serverlist found. |
| 1603 | gpr_log(GPR_ERROR, |
| 1604 | "[grpclb %p] Invalid LB response received: '%s'. Ignoring.", |
| 1605 | glb_policy, |
| 1606 | grpc_dump_slice(response_slice, GPR_DUMP_ASCII | GPR_DUMP_HEX)); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1607 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1608 | grpc_slice_unref_internal(response_slice); |
| 1609 | if (!glb_policy->shutting_down) { |
| 1610 | // Keep listening for serverlist updates. |
| 1611 | op->op = GRPC_OP_RECV_MESSAGE; |
| 1612 | op->data.recv_message.recv_message = &lb_calld->recv_message_payload; |
| 1613 | op->flags = 0; |
| 1614 | op->reserved = nullptr; |
| 1615 | op++; |
| 1616 | // Reuse the "lb_on_response_received_locked" ref taken in |
| 1617 | // query_for_backends_locked(). |
| 1618 | const grpc_call_error call_error = grpc_call_start_batch_and_execute( |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1619 | lb_calld->lb_call, ops, static_cast<size_t>(op - ops), |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1620 | &lb_calld->lb_on_response_received); |
| 1621 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 1622 | } else { |
| 1623 | glb_lb_call_data_unref(lb_calld, |
| 1624 | "lb_on_response_received_locked+glb_shutdown"); |
| 1625 | } |
| 1626 | } |
| 1627 | |
| 1628 | static void lb_on_server_status_received_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1629 | glb_lb_call_data* lb_calld = static_cast<glb_lb_call_data*>(arg); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1630 | glb_lb_policy* glb_policy = lb_calld->glb_policy; |
| 1631 | GPR_ASSERT(lb_calld->lb_call != nullptr); |
| 1632 | if (grpc_lb_glb_trace.enabled()) { |
| 1633 | char* status_details = |
| 1634 | grpc_slice_to_c_string(lb_calld->lb_call_status_details); |
| 1635 | gpr_log(GPR_INFO, |
| 1636 | "[grpclb %p] Status from LB server received. Status = %d, details " |
| 1637 | "= '%s', (lb_calld: %p, lb_call: %p), error '%s'", |
| 1638 | lb_calld->glb_policy, lb_calld->lb_call_status, status_details, |
| 1639 | lb_calld, lb_calld->lb_call, grpc_error_string(error)); |
| 1640 | gpr_free(status_details); |
| 1641 | } |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 1642 | grpc_lb_policy_try_reresolve(&glb_policy->base, &grpc_lb_glb_trace, |
| 1643 | GRPC_ERROR_NONE); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1644 | // If this lb_calld is still in use, this call ended because of a failure so |
| 1645 | // we want to retry connecting. Otherwise, we have deliberately ended this |
| 1646 | // call and no further action is required. |
| 1647 | if (lb_calld == glb_policy->lb_calld) { |
| 1648 | glb_policy->lb_calld = nullptr; |
| 1649 | if (lb_calld->client_load_report_timer_callback_pending) { |
| 1650 | grpc_timer_cancel(&lb_calld->client_load_report_timer); |
| 1651 | } |
| 1652 | GPR_ASSERT(!glb_policy->shutting_down); |
| 1653 | if (lb_calld->seen_initial_response) { |
| 1654 | // If we lose connection to the LB server, reset the backoff and restart |
| 1655 | // the LB call immediately. |
| 1656 | glb_policy->lb_call_backoff->Reset(); |
| 1657 | query_for_backends_locked(glb_policy); |
| 1658 | } else { |
| 1659 | // If this LB call fails establishing any connection to the LB server, |
| 1660 | // retry later. |
| 1661 | start_lb_call_retry_timer_locked(glb_policy); |
| 1662 | } |
| 1663 | } |
| 1664 | glb_lb_call_data_unref(lb_calld, "lb_call_ended"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1665 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1666 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1667 | static void lb_on_fallback_timer_locked(void* arg, grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1668 | glb_lb_policy* glb_policy = static_cast<glb_lb_policy*>(arg); |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 1669 | glb_policy->fallback_timer_callback_pending = false; |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1670 | /* If we receive a serverlist after the timer fires but before this callback |
| 1671 | * actually runs, don't fall back. */ |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 1672 | if (glb_policy->serverlist == nullptr && !glb_policy->shutting_down && |
| 1673 | error == GRPC_ERROR_NONE) { |
| 1674 | if (grpc_lb_glb_trace.enabled()) { |
| 1675 | gpr_log(GPR_INFO, |
| 1676 | "[grpclb %p] Falling back to use backends from resolver", |
| 1677 | glb_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1678 | } |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 1679 | GPR_ASSERT(glb_policy->fallback_backend_addresses != nullptr); |
| 1680 | rr_handover_locked(glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1681 | } |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1682 | GRPC_LB_POLICY_UNREF(&glb_policy->base, "grpclb_fallback_timer"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1683 | } |
| 1684 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1685 | static void fallback_update_locked(glb_lb_policy* glb_policy, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1686 | const grpc_lb_addresses* addresses) { |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1687 | GPR_ASSERT(glb_policy->fallback_backend_addresses != nullptr); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1688 | grpc_lb_addresses_destroy(glb_policy->fallback_backend_addresses); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1689 | glb_policy->fallback_backend_addresses = |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1690 | extract_backend_addresses_locked(addresses); |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 1691 | if (glb_policy->lb_fallback_timeout_ms > 0 && |
| 1692 | glb_policy->rr_policy != nullptr) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1693 | rr_handover_locked(glb_policy); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1694 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1695 | } |
| 1696 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1697 | static void glb_update_locked(grpc_lb_policy* policy, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1698 | const grpc_lb_policy_args* args) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1699 | glb_lb_policy* glb_policy = reinterpret_cast<glb_lb_policy*>(policy); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1700 | const grpc_arg* arg = |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1701 | grpc_channel_args_find(args->args, GRPC_ARG_LB_ADDRESSES); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1702 | if (arg == nullptr || arg->type != GRPC_ARG_POINTER) { |
| 1703 | if (glb_policy->lb_channel == nullptr) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1704 | // If we don't have a current channel to the LB, go into TRANSIENT |
| 1705 | // FAILURE. |
| 1706 | grpc_connectivity_state_set( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1707 | &glb_policy->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE, |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1708 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing update in args"), |
| 1709 | "glb_update_missing"); |
| 1710 | } else { |
| 1711 | // otherwise, keep using the current LB channel (ignore this update). |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1712 | gpr_log( |
| 1713 | GPR_ERROR, |
| 1714 | "[grpclb %p] No valid LB addresses channel arg in update, ignoring.", |
| 1715 | glb_policy); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1716 | } |
| 1717 | return; |
| 1718 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1719 | const grpc_lb_addresses* addresses = |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1720 | static_cast<const grpc_lb_addresses*>(arg->value.pointer.p); |
Mark D. Roth | 97b6e5d | 2017-10-09 08:31:41 -0700 | [diff] [blame] | 1721 | // If a non-empty serverlist hasn't been received from the balancer, |
| 1722 | // propagate the update to fallback_backend_addresses. |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1723 | if (glb_policy->serverlist == nullptr) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1724 | fallback_update_locked(glb_policy, addresses); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1725 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1726 | GPR_ASSERT(glb_policy->lb_channel != nullptr); |
Mark D. Roth | 97b6e5d | 2017-10-09 08:31:41 -0700 | [diff] [blame] | 1727 | // Propagate updates to the LB channel (pick_first) through the fake |
| 1728 | // resolver. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1729 | grpc_channel_args* lb_channel_args = build_lb_channel_args( |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 1730 | addresses, glb_policy->response_generator.get(), args->args); |
| 1731 | glb_policy->response_generator->SetResponse(lb_channel_args); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1732 | grpc_channel_args_destroy(lb_channel_args); |
Mark D. Roth | 97b6e5d | 2017-10-09 08:31:41 -0700 | [diff] [blame] | 1733 | // Start watching the LB channel connectivity for connection, if not |
| 1734 | // already doing so. |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1735 | if (!glb_policy->watching_lb_channel) { |
David Garcia Quintas | 6a7935e | 2017-07-27 19:24:52 -0700 | [diff] [blame] | 1736 | glb_policy->lb_channel_connectivity = grpc_channel_check_connectivity_state( |
| 1737 | glb_policy->lb_channel, true /* try to connect */); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1738 | grpc_channel_element* client_channel_elem = grpc_channel_stack_last_element( |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1739 | grpc_channel_get_channel_stack(glb_policy->lb_channel)); |
| 1740 | GPR_ASSERT(client_channel_elem->filter == &grpc_client_channel_filter); |
| 1741 | glb_policy->watching_lb_channel = true; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1742 | GRPC_LB_POLICY_REF(&glb_policy->base, "watch_lb_channel_connectivity"); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1743 | grpc_client_channel_watch_connectivity_state( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1744 | client_channel_elem, |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1745 | grpc_polling_entity_create_from_pollset_set( |
| 1746 | glb_policy->base.interested_parties), |
| 1747 | &glb_policy->lb_channel_connectivity, |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1748 | &glb_policy->lb_channel_on_connectivity_changed, nullptr); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1749 | } |
| 1750 | } |
| 1751 | |
| 1752 | // Invoked as part of the update process. It continues watching the LB channel |
| 1753 | // until it shuts down or becomes READY. It's invoked even if the LB channel |
| 1754 | // stayed READY throughout the update (for example if the update is identical). |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1755 | static void glb_lb_channel_on_connectivity_changed_cb(void* arg, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1756 | grpc_error* error) { |
Noah Eisen | be82e64 | 2018-02-09 09:16:55 -0800 | [diff] [blame] | 1757 | glb_lb_policy* glb_policy = static_cast<glb_lb_policy*>(arg); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1758 | if (glb_policy->shutting_down) goto done; |
| 1759 | // Re-initialize the lb_call. This should also take care of updating the |
| 1760 | // embedded RR policy. Note that the current RR policy, if any, will stay in |
| 1761 | // effect until an update from the new lb_call is received. |
| 1762 | switch (glb_policy->lb_channel_connectivity) { |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1763 | case GRPC_CHANNEL_CONNECTING: |
| 1764 | case GRPC_CHANNEL_TRANSIENT_FAILURE: { |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1765 | // Keep watching the LB channel. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1766 | grpc_channel_element* client_channel_elem = |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1767 | grpc_channel_stack_last_element( |
| 1768 | grpc_channel_get_channel_stack(glb_policy->lb_channel)); |
| 1769 | GPR_ASSERT(client_channel_elem->filter == &grpc_client_channel_filter); |
| 1770 | grpc_client_channel_watch_connectivity_state( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1771 | client_channel_elem, |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1772 | grpc_polling_entity_create_from_pollset_set( |
| 1773 | glb_policy->base.interested_parties), |
| 1774 | &glb_policy->lb_channel_connectivity, |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1775 | &glb_policy->lb_channel_on_connectivity_changed, nullptr); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1776 | break; |
| 1777 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1778 | // The LB channel may be IDLE because it's shut down before the update. |
| 1779 | // Restart the LB call to kick the LB channel into gear. |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1780 | case GRPC_CHANNEL_IDLE: |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1781 | case GRPC_CHANNEL_READY: |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1782 | if (glb_policy->lb_calld != nullptr) { |
| 1783 | lb_call_data_shutdown(glb_policy); |
| 1784 | } |
| 1785 | if (glb_policy->started_picking) { |
Juanli Shen | 4ed35d1 | 2018-01-08 18:01:45 -0800 | [diff] [blame] | 1786 | if (glb_policy->retry_timer_callback_pending) { |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1787 | grpc_timer_cancel(&glb_policy->lb_call_retry_timer); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1788 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1789 | glb_policy->lb_call_backoff->Reset(); |
| 1790 | query_for_backends_locked(glb_policy); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1791 | } |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1792 | // Fall through. |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1793 | case GRPC_CHANNEL_SHUTDOWN: |
| 1794 | done: |
| 1795 | glb_policy->watching_lb_channel = false; |
Mark D. Roth | c0febd3 | 2018-01-09 10:25:24 -0800 | [diff] [blame] | 1796 | GRPC_LB_POLICY_UNREF(&glb_policy->base, |
| 1797 | "watch_lb_channel_connectivity_cb_shutdown"); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1798 | } |
| 1799 | } |
| 1800 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1801 | /* Code wiring the policy with the rest of the core */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1802 | static const grpc_lb_policy_vtable glb_lb_policy_vtable = { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 1803 | glb_destroy, |
| 1804 | glb_shutdown_locked, |
| 1805 | glb_pick_locked, |
| 1806 | glb_cancel_pick_locked, |
| 1807 | glb_cancel_picks_locked, |
| 1808 | glb_ping_one_locked, |
| 1809 | glb_exit_idle_locked, |
| 1810 | glb_check_connectivity_locked, |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1811 | glb_notify_on_state_change_locked, |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 1812 | glb_update_locked}; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1813 | |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1814 | static grpc_lb_policy* glb_create(grpc_lb_policy_factory* factory, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1815 | grpc_lb_policy_args* args) { |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1816 | /* Count the number of gRPC-LB addresses. There must be at least one. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1817 | const grpc_arg* arg = |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1818 | grpc_channel_args_find(args->args, GRPC_ARG_LB_ADDRESSES); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1819 | if (arg == nullptr || arg->type != GRPC_ARG_POINTER) { |
| 1820 | return nullptr; |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1821 | } |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 1822 | grpc_lb_addresses* addresses = |
| 1823 | static_cast<grpc_lb_addresses*>(arg->value.pointer.p); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1824 | size_t num_grpclb_addrs = 0; |
| 1825 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 1826 | if (addresses->addresses[i].is_balancer) ++num_grpclb_addrs; |
| 1827 | } |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1828 | if (num_grpclb_addrs == 0) return nullptr; |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1829 | |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 1830 | glb_lb_policy* glb_policy = |
| 1831 | static_cast<glb_lb_policy*>(gpr_zalloc(sizeof(*glb_policy))); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1832 | |
| 1833 | /* Get server name. */ |
| 1834 | arg = grpc_channel_args_find(args->args, GRPC_ARG_SERVER_URI); |
ncteisen | bf323a9 | 2018-02-14 17:34:05 -0800 | [diff] [blame] | 1835 | const char* server_uri = grpc_channel_arg_get_string(arg); |
| 1836 | GPR_ASSERT(server_uri != nullptr); |
| 1837 | grpc_uri* uri = grpc_uri_parse(server_uri, true); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1838 | GPR_ASSERT(uri->path[0] != '\0'); |
| 1839 | glb_policy->server_name = |
| 1840 | gpr_strdup(uri->path[0] == '/' ? uri->path + 1 : uri->path); |
Craig Tiller | 6014e8a | 2017-10-16 13:50:29 -0700 | [diff] [blame] | 1841 | if (grpc_lb_glb_trace.enabled()) { |
David Garcia Quintas | a1c6590 | 2017-11-09 10:37:35 -0800 | [diff] [blame] | 1842 | gpr_log(GPR_INFO, |
| 1843 | "[grpclb %p] Will use '%s' as the server name for LB request.", |
| 1844 | glb_policy, glb_policy->server_name); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1845 | } |
| 1846 | grpc_uri_destroy(uri); |
| 1847 | |
| 1848 | glb_policy->cc_factory = args->client_channel_factory; |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1849 | GPR_ASSERT(glb_policy->cc_factory != nullptr); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1850 | |
| 1851 | arg = grpc_channel_args_find(args->args, GRPC_ARG_GRPCLB_CALL_TIMEOUT_MS); |
| 1852 | glb_policy->lb_call_timeout_ms = |
Yash Tibrewal | d8b84a2 | 2017-09-25 13:38:03 -0700 | [diff] [blame] | 1853 | grpc_channel_arg_get_integer(arg, {0, 0, INT_MAX}); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1854 | |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1855 | arg = grpc_channel_args_find(args->args, GRPC_ARG_GRPCLB_FALLBACK_TIMEOUT_MS); |
| 1856 | glb_policy->lb_fallback_timeout_ms = grpc_channel_arg_get_integer( |
Yash Tibrewal | 1150bfb | 2017-09-28 14:43:41 -0700 | [diff] [blame] | 1857 | arg, {GRPC_GRPCLB_DEFAULT_FALLBACK_TIMEOUT_MS, 0, INT_MAX}); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1858 | |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1859 | // Make sure that GRPC_ARG_LB_POLICY_NAME is set in channel args, |
| 1860 | // since we use this to trigger the client_load_reporting filter. |
Yash Tibrewal | 9eb8672 | 2017-09-17 23:43:30 -0700 | [diff] [blame] | 1861 | grpc_arg new_arg = grpc_channel_arg_string_create( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1862 | (char*)GRPC_ARG_LB_POLICY_NAME, (char*)"grpclb"); |
| 1863 | static const char* args_to_remove[] = {GRPC_ARG_LB_POLICY_NAME}; |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1864 | glb_policy->args = grpc_channel_args_copy_and_add_and_remove( |
| 1865 | args->args, args_to_remove, GPR_ARRAY_SIZE(args_to_remove), &new_arg, 1); |
| 1866 | |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1867 | /* Extract the backend addresses (may be empty) from the resolver for |
| 1868 | * fallback. */ |
| 1869 | glb_policy->fallback_backend_addresses = |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1870 | extract_backend_addresses_locked(addresses); |
Juanli Shen | fe40815 | 2017-09-27 12:27:20 -0700 | [diff] [blame] | 1871 | |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1872 | /* Create a client channel over them to communicate with a LB service */ |
| 1873 | glb_policy->response_generator = |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 1874 | grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>(); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1875 | grpc_channel_args* lb_channel_args = build_lb_channel_args( |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 1876 | addresses, glb_policy->response_generator.get(), args->args); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1877 | char* uri_str; |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1878 | gpr_asprintf(&uri_str, "fake:///%s", glb_policy->server_name); |
| 1879 | glb_policy->lb_channel = grpc_lb_policy_grpclb_create_lb_channel( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1880 | uri_str, args->client_channel_factory, lb_channel_args); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1881 | |
| 1882 | /* Propagate initial resolution */ |
Mark D. Roth | 209f644 | 2018-02-08 10:26:46 -0800 | [diff] [blame] | 1883 | glb_policy->response_generator->SetResponse(lb_channel_args); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1884 | grpc_channel_args_destroy(lb_channel_args); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1885 | gpr_free(uri_str); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1886 | if (glb_policy->lb_channel == nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1887 | gpr_free((void*)glb_policy->server_name); |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1888 | grpc_channel_args_destroy(glb_policy->args); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1889 | gpr_free(glb_policy); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1890 | return nullptr; |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1891 | } |
Ken Payson | 9fa10cc | 2017-09-14 11:49:52 -0700 | [diff] [blame] | 1892 | grpc_subchannel_index_ref(); |
Juanli Shen | 87c6504 | 2018-02-15 09:42:45 -0800 | [diff] [blame^] | 1893 | GRPC_CLOSURE_INIT(&glb_policy->rr_on_connectivity_changed, |
| 1894 | rr_on_connectivity_changed_locked, glb_policy, |
| 1895 | grpc_combiner_scheduler(args->combiner)); |
| 1896 | GRPC_CLOSURE_INIT(&glb_policy->rr_on_reresolution_requested, |
| 1897 | rr_on_reresolution_requested_locked, glb_policy, |
| 1898 | grpc_combiner_scheduler(args->combiner)); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1899 | GRPC_CLOSURE_INIT(&glb_policy->lb_channel_on_connectivity_changed, |
| 1900 | glb_lb_channel_on_connectivity_changed_cb, glb_policy, |
| 1901 | grpc_combiner_scheduler(args->combiner)); |
| 1902 | grpc_lb_policy_init(&glb_policy->base, &glb_lb_policy_vtable, args->combiner); |
| 1903 | grpc_connectivity_state_init(&glb_policy->state_tracker, GRPC_CHANNEL_IDLE, |
| 1904 | "grpclb"); |
Juanli Shen | 8e4c9d3 | 2018-01-23 16:26:39 -0800 | [diff] [blame] | 1905 | // Init LB call backoff option. |
| 1906 | grpc_core::BackOff::Options backoff_options; |
| 1907 | backoff_options |
| 1908 | .set_initial_backoff(GRPC_GRPCLB_INITIAL_CONNECT_BACKOFF_SECONDS * 1000) |
| 1909 | .set_multiplier(GRPC_GRPCLB_RECONNECT_BACKOFF_MULTIPLIER) |
| 1910 | .set_jitter(GRPC_GRPCLB_RECONNECT_JITTER) |
| 1911 | .set_max_backoff(GRPC_GRPCLB_RECONNECT_MAX_BACKOFF_SECONDS * 1000); |
| 1912 | glb_policy->lb_call_backoff.Init(backoff_options); |
Yash Tibrewal | a495220 | 2017-09-13 10:53:28 -0700 | [diff] [blame] | 1913 | return &glb_policy->base; |
| 1914 | } |
| 1915 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1916 | static void glb_factory_ref(grpc_lb_policy_factory* factory) {} |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1917 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1918 | static void glb_factory_unref(grpc_lb_policy_factory* factory) {} |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1919 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1920 | static const grpc_lb_policy_factory_vtable glb_factory_vtable = { |
| 1921 | glb_factory_ref, glb_factory_unref, glb_create, "grpclb"}; |
| 1922 | |
| 1923 | static grpc_lb_policy_factory glb_lb_policy_factory = {&glb_factory_vtable}; |
| 1924 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1925 | grpc_lb_policy_factory* grpc_glb_lb_factory_create() { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1926 | return &glb_lb_policy_factory; |
| 1927 | } |
| 1928 | |
| 1929 | /* Plugin registration */ |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1930 | |
| 1931 | // Only add client_load_reporting filter if the grpclb LB policy is used. |
| 1932 | static bool maybe_add_client_load_reporting_filter( |
Yash Tibrewal | 8cf1470 | 2017-12-06 09:47:54 -0800 | [diff] [blame] | 1933 | grpc_channel_stack_builder* builder, void* arg) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1934 | const grpc_channel_args* args = |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1935 | grpc_channel_stack_builder_get_channel_arguments(builder); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1936 | const grpc_arg* channel_arg = |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1937 | grpc_channel_args_find(args, GRPC_ARG_LB_POLICY_NAME); |
Noah Eisen | 882dfed | 2017-11-14 14:58:20 -0800 | [diff] [blame] | 1938 | if (channel_arg != nullptr && channel_arg->type == GRPC_ARG_STRING && |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1939 | strcmp(channel_arg->value.string, "grpclb") == 0) { |
| 1940 | return grpc_channel_stack_builder_append_filter( |
Noah Eisen | 4d20a66 | 2018-02-09 09:34:04 -0800 | [diff] [blame] | 1941 | builder, static_cast<const grpc_channel_filter*>(arg), nullptr, |
| 1942 | nullptr); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1943 | } |
| 1944 | return true; |
| 1945 | } |
| 1946 | |
ncteisen | adbfbd5 | 2017-11-16 15:35:45 -0800 | [diff] [blame] | 1947 | void grpc_lb_policy_grpclb_init() { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1948 | grpc_register_lb_policy(grpc_glb_lb_factory_create()); |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1949 | grpc_channel_init_register_stage(GRPC_CLIENT_SUBCHANNEL, |
| 1950 | GRPC_CHANNEL_INIT_BUILTIN_PRIORITY, |
| 1951 | maybe_add_client_load_reporting_filter, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1952 | (void*)&grpc_client_load_reporting_filter); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1953 | } |
| 1954 | |
ncteisen | adbfbd5 | 2017-11-16 15:35:45 -0800 | [diff] [blame] | 1955 | void grpc_lb_policy_grpclb_shutdown() {} |