David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2016, Google Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
David Garcia Quintas | 8b3b97f | 2016-07-15 07:46:47 -0700 | [diff] [blame] | 34 | /** Implementation of the gRPC LB policy. |
| 35 | * |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 36 | * This policy takes as input a set of resolved addresses {a1..an} for which the |
| 37 | * LB set was set (it's the resolver's responsibility to ensure this). That is |
| 38 | * to say, {a1..an} represent a collection of LB servers. |
| 39 | * |
| 40 | * An internal channel (\a glb_lb_policy.lb_channel) is created over {a1..an}. |
| 41 | * This channel behaves just like a regular channel. In particular, the |
| 42 | * constructed URI over the addresses a1..an will use the default pick first |
| 43 | * policy to select from this list of LB server backends. |
| 44 | * |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 45 | * 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] | 46 | * idle state, \a query_for_backends_locked() is called. This function sets up |
| 47 | * and initiates the internal communication with the LB server. In particular, |
| 48 | * it's responsible for instantiating the internal *streaming* call to the LB |
| 49 | * 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] | 50 | * serviced by two callbacks, \a lb_on_server_status_received and \a |
| 51 | * lb_on_response_received. The former will be called when the call to the LB |
| 52 | * server completes. This can happen if the LB server closes the connection or |
| 53 | * 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] | 54 | * 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] | 55 | * applies, continuing to pick from the list {a1..an}. |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 56 | * |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 57 | * Upon sucesss, the incoming \a LoadBalancingResponse is processed by \a |
| 58 | * res_recv. An invalid one results in the termination of the streaming call. A |
| 59 | * new streaming call should be created if possible, failing the original call |
| 60 | * otherwise. For a valid \a LoadBalancingResponse, the server list of actual |
| 61 | * backends is extracted. A Round Robin policy will be created from this list. |
| 62 | * There are two possible scenarios: |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 63 | * |
| 64 | * 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] | 65 | * the Round Robin policy. \a rr_handover_locked() will instantiate the RR |
| 66 | * policy and perform all the pending operations over it. |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 67 | * 2. There's already a RR policy instance active. We need to introduce the new |
| 68 | * one build from the new serverlist, but taking care not to disrupt the |
| 69 | * operations in progress over the old RR instance. This is done by |
| 70 | * decreasing the reference count on the old policy. The moment no more |
| 71 | * references are held on the old RR policy, it'll be destroyed and \a |
David Garcia Quintas | 348cfdb | 2016-08-19 12:19:43 -0700 | [diff] [blame] | 72 | * glb_rr_connectivity_changed notified with a \a GRPC_CHANNEL_SHUTDOWN |
| 73 | * 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] | 74 | * is done once again via \a rr_handover_locked(). |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 75 | * |
| 76 | * |
| 77 | * Once a RR policy instance is in place (and getting updated as described), |
| 78 | * calls to for a pick, a ping or a cancellation will be serviced right away by |
| 79 | * 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] | 80 | * (ie, right after the creation of the gRPCLB policy, if an empty serverlist is |
| 81 | * received, etc), pick/ping requests are added to a list of pending picks/pings |
| 82 | * to be flushed and serviced as part of \a rr_handover_locked() the moment the |
| 83 | * RR policy instance becomes available. |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 84 | * |
| 85 | * \see https://github.com/grpc/grpc/blob/master/doc/load-balancing.md for the |
| 86 | * high level design and details. */ |
David Garcia Quintas | 8b3b97f | 2016-07-15 07:46:47 -0700 | [diff] [blame] | 87 | |
| 88 | /* TODO(dgq): |
| 89 | * - Implement LB service forwarding (point 2c. in the doc's diagram). |
| 90 | */ |
| 91 | |
murgatroid99 | 085f9af | 2016-10-24 09:55:44 -0700 | [diff] [blame] | 92 | /* With the addition of a libuv endpoint, sockaddr.h now includes uv.h when |
| 93 | using that endpoint. Because of various transitive includes in uv.h, |
| 94 | including windows.h on Windows, uv.h must be included before other system |
| 95 | headers. Therefore, sockaddr.h must always be included first */ |
murgatroid99 | 7871f73 | 2016-09-23 13:49:05 -0700 | [diff] [blame] | 96 | #include "src/core/lib/iomgr/sockaddr.h" |
| 97 | |
David Garcia Quintas | 8a81aa1 | 2016-08-22 15:06:49 -0700 | [diff] [blame] | 98 | #include <errno.h> |
| 99 | |
David Garcia Quintas | 22e8f1d | 2016-06-15 23:53:00 -0700 | [diff] [blame] | 100 | #include <string.h> |
| 101 | |
| 102 | #include <grpc/byte_buffer_reader.h> |
| 103 | #include <grpc/grpc.h> |
| 104 | #include <grpc/support/alloc.h> |
| 105 | #include <grpc/support/host_port.h> |
| 106 | #include <grpc/support/string_util.h> |
David Garcia Quintas | 6909922 | 2016-10-03 11:28:37 -0700 | [diff] [blame] | 107 | #include <grpc/support/time.h> |
David Garcia Quintas | 22e8f1d | 2016-06-15 23:53:00 -0700 | [diff] [blame] | 108 | |
Mark D. Roth | 2137cd8 | 2016-09-14 09:04:00 -0700 | [diff] [blame] | 109 | #include "src/core/ext/client_channel/client_channel_factory.h" |
Mark D. Roth | 1519574 | 2016-10-07 09:02:28 -0700 | [diff] [blame] | 110 | #include "src/core/ext/client_channel/lb_policy_factory.h" |
Mark D. Roth | 2137cd8 | 2016-09-14 09:04:00 -0700 | [diff] [blame] | 111 | #include "src/core/ext/client_channel/lb_policy_registry.h" |
| 112 | #include "src/core/ext/client_channel/parse_address.h" |
David Garcia Quintas | 8782d1b | 2016-06-15 23:58:44 -0700 | [diff] [blame] | 113 | #include "src/core/ext/lb_policy/grpclb/grpclb.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 114 | #include "src/core/ext/lb_policy/grpclb/load_balancer_api.h" |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 115 | #include "src/core/lib/channel/channel_args.h" |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 116 | #include "src/core/lib/iomgr/sockaddr.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 117 | #include "src/core/lib/iomgr/sockaddr_utils.h" |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 118 | #include "src/core/lib/iomgr/timer.h" |
Craig Tiller | 18b4ba3 | 2016-11-09 15:23:42 -0800 | [diff] [blame^] | 119 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 0f31080 | 2016-10-26 16:25:56 -0700 | [diff] [blame] | 120 | #include "src/core/lib/slice/slice_string_helpers.h" |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 121 | #include "src/core/lib/support/backoff.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 122 | #include "src/core/lib/support/string.h" |
| 123 | #include "src/core/lib/surface/call.h" |
| 124 | #include "src/core/lib/surface/channel.h" |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 125 | #include "src/core/lib/transport/static_metadata.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 126 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 127 | #define BACKOFF_MULTIPLIER 1.6 |
| 128 | #define BACKOFF_JITTER 0.2 |
| 129 | #define BACKOFF_MIN_SECONDS 10 |
| 130 | #define BACKOFF_MAX_SECONDS 60 |
| 131 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 132 | int grpc_lb_glb_trace = 0; |
| 133 | |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 134 | /* add lb_token of selected subchannel (address) to the call's initial |
| 135 | * metadata */ |
| 136 | static void initial_metadata_add_lb_token( |
| 137 | grpc_metadata_batch *initial_metadata, |
| 138 | grpc_linked_mdelem *lb_token_mdelem_storage, grpc_mdelem *lb_token) { |
| 139 | GPR_ASSERT(lb_token_mdelem_storage != NULL); |
| 140 | GPR_ASSERT(lb_token != NULL); |
| 141 | grpc_metadata_batch_add_tail(initial_metadata, lb_token_mdelem_storage, |
| 142 | lb_token); |
| 143 | } |
| 144 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 145 | typedef struct wrapped_rr_closure_arg { |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 146 | /* the closure instance using this struct as argument */ |
| 147 | grpc_closure wrapper_closure; |
| 148 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 149 | /* the original closure. Usually a on_complete/notify cb for pick() and ping() |
| 150 | * calls against the internal RR instance, respectively. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 151 | grpc_closure *wrapped_closure; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 152 | |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 153 | /* the pick's initial metadata, kept in order to append the LB token for the |
| 154 | * pick */ |
| 155 | grpc_metadata_batch *initial_metadata; |
| 156 | |
| 157 | /* the picked target, used to determine which LB token to add to the pick's |
| 158 | * initial metadata */ |
| 159 | grpc_connected_subchannel **target; |
| 160 | |
| 161 | /* the LB token associated with the pick */ |
| 162 | grpc_mdelem *lb_token; |
| 163 | |
| 164 | /* storage for the lb token initial metadata mdelem */ |
| 165 | grpc_linked_mdelem *lb_token_mdelem_storage; |
| 166 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 167 | /* The RR instance related to the closure */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 168 | grpc_lb_policy *rr_policy; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 169 | |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 170 | /* heap memory to be freed upon closure execution. */ |
| 171 | void *free_when_done; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 172 | } wrapped_rr_closure_arg; |
| 173 | |
| 174 | /* The \a on_complete closure passed as part of the pick requires keeping a |
| 175 | * reference to its associated round robin instance. We wrap this closure in |
| 176 | * order to unref the round robin instance upon its invocation */ |
| 177 | static void wrapped_rr_closure(grpc_exec_ctx *exec_ctx, void *arg, |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 178 | grpc_error *error) { |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 179 | wrapped_rr_closure_arg *wc_arg = arg; |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 180 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 181 | GPR_ASSERT(wc_arg->wrapped_closure != NULL); |
| 182 | grpc_exec_ctx_sched(exec_ctx, wc_arg->wrapped_closure, GRPC_ERROR_REF(error), |
| 183 | NULL); |
| 184 | |
| 185 | if (wc_arg->rr_policy != NULL) { |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 186 | /* if target is NULL, no pick has been made by the RR policy (eg, all |
| 187 | * addresses failed to connect). There won't be any user_data/token |
| 188 | * available */ |
| 189 | if (wc_arg->target != NULL) { |
| 190 | initial_metadata_add_lb_token(wc_arg->initial_metadata, |
| 191 | wc_arg->lb_token_mdelem_storage, |
| 192 | GRPC_MDELEM_REF(wc_arg->lb_token)); |
| 193 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 194 | if (grpc_lb_glb_trace) { |
| 195 | gpr_log(GPR_INFO, "Unreffing RR (0x%" PRIxPTR ")", |
| 196 | (intptr_t)wc_arg->rr_policy); |
| 197 | } |
| 198 | GRPC_LB_POLICY_UNREF(exec_ctx, wc_arg->rr_policy, "wrapped_rr_closure"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 199 | } |
David Garcia Quintas | b39330d | 2016-10-14 13:35:56 -0700 | [diff] [blame] | 200 | GPR_ASSERT(wc_arg->free_when_done != NULL); |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 201 | gpr_free(wc_arg->free_when_done); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 202 | } |
| 203 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 204 | /* Linked list of pending pick requests. It stores all information needed to |
| 205 | * eventually call (Round Robin's) pick() on them. They mainly stay pending |
| 206 | * waiting for the RR policy to be created/updated. |
| 207 | * |
| 208 | * One particularity is the wrapping of the user-provided \a on_complete closure |
| 209 | * (in \a wrapped_on_complete and \a wrapped_on_complete_arg). This is needed in |
| 210 | * order to correctly unref the RR policy instance upon completion of the pick. |
| 211 | * See \a wrapped_rr_closure for details. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 212 | typedef struct pending_pick { |
| 213 | struct pending_pick *next; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 214 | |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 215 | /* original pick()'s arguments */ |
| 216 | grpc_lb_policy_pick_args pick_args; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 217 | |
| 218 | /* output argument where to store the pick()ed connected subchannel, or NULL |
| 219 | * upon error. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 220 | grpc_connected_subchannel **target; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 221 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 222 | /* args for wrapped_on_complete */ |
| 223 | wrapped_rr_closure_arg wrapped_on_complete_arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 224 | } pending_pick; |
| 225 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 226 | static void add_pending_pick(pending_pick **root, |
| 227 | const grpc_lb_policy_pick_args *pick_args, |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 228 | grpc_connected_subchannel **target, |
| 229 | grpc_closure *on_complete) { |
| 230 | pending_pick *pp = gpr_malloc(sizeof(*pp)); |
| 231 | memset(pp, 0, sizeof(pending_pick)); |
| 232 | memset(&pp->wrapped_on_complete_arg, 0, sizeof(wrapped_rr_closure_arg)); |
| 233 | pp->next = *root; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 234 | pp->pick_args = *pick_args; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 235 | pp->target = target; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 236 | pp->wrapped_on_complete_arg.wrapped_closure = on_complete; |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 237 | pp->wrapped_on_complete_arg.target = target; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 238 | pp->wrapped_on_complete_arg.initial_metadata = pick_args->initial_metadata; |
| 239 | pp->wrapped_on_complete_arg.lb_token_mdelem_storage = |
| 240 | pick_args->lb_token_mdelem_storage; |
David Garcia Quintas | b39330d | 2016-10-14 13:35:56 -0700 | [diff] [blame] | 241 | pp->wrapped_on_complete_arg.free_when_done = pp; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 242 | grpc_closure_init(&pp->wrapped_on_complete_arg.wrapper_closure, |
| 243 | wrapped_rr_closure, &pp->wrapped_on_complete_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 244 | *root = pp; |
| 245 | } |
| 246 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 247 | /* Same as the \a pending_pick struct but for ping operations */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 248 | typedef struct pending_ping { |
| 249 | struct pending_ping *next; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 250 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 251 | /* args for wrapped_notify */ |
| 252 | wrapped_rr_closure_arg wrapped_notify_arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 253 | } pending_ping; |
| 254 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 255 | static void add_pending_ping(pending_ping **root, grpc_closure *notify) { |
| 256 | pending_ping *pping = gpr_malloc(sizeof(*pping)); |
| 257 | memset(pping, 0, sizeof(pending_ping)); |
| 258 | memset(&pping->wrapped_notify_arg, 0, sizeof(wrapped_rr_closure_arg)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 259 | pping->wrapped_notify_arg.wrapped_closure = notify; |
David Garcia Quintas | b39330d | 2016-10-14 13:35:56 -0700 | [diff] [blame] | 260 | pping->wrapped_notify_arg.free_when_done = pping; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 261 | pping->next = *root; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 262 | grpc_closure_init(&pping->wrapped_notify_arg.wrapper_closure, |
| 263 | wrapped_rr_closure, &pping->wrapped_notify_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 264 | *root = pping; |
| 265 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 266 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 267 | /* |
| 268 | * glb_lb_policy |
| 269 | */ |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 270 | typedef struct rr_connectivity_data rr_connectivity_data; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 271 | static const grpc_lb_policy_vtable glb_lb_policy_vtable; |
| 272 | typedef struct glb_lb_policy { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 273 | /** base policy: must be first */ |
| 274 | grpc_lb_policy base; |
| 275 | |
| 276 | /** mutex protecting remaining members */ |
| 277 | gpr_mu mu; |
| 278 | |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 279 | /** who the client is trying to communicate with */ |
Mark D. Roth | d1604af | 2016-09-22 11:20:27 -0700 | [diff] [blame] | 280 | const char *server_name; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 281 | grpc_client_channel_factory *cc_factory; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 282 | grpc_channel_args *args; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 283 | |
David Garcia Quintas | 5cf3c37 | 2016-10-03 14:30:03 -0700 | [diff] [blame] | 284 | /** deadline for the LB's call */ |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 285 | gpr_timespec deadline; |
| 286 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 287 | /** for communicating with the LB server */ |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 288 | grpc_channel *lb_channel; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 289 | |
| 290 | /** the RR policy to use of the backend servers returned by the LB server */ |
| 291 | grpc_lb_policy *rr_policy; |
| 292 | |
| 293 | bool started_picking; |
| 294 | |
| 295 | /** our connectivity state tracker */ |
| 296 | grpc_connectivity_state_tracker state_tracker; |
| 297 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 298 | /** stores the deserialized response from the LB. May be NULL until one such |
| 299 | * response has arrived. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 300 | grpc_grpclb_serverlist *serverlist; |
| 301 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 302 | /** list of picks that are waiting on RR's policy connectivity */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 303 | pending_pick *pending_picks; |
| 304 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 305 | /** list of pings that are waiting on RR's policy connectivity */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 306 | pending_ping *pending_pings; |
| 307 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 308 | bool shutting_down; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 309 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 310 | /************************************************************/ |
| 311 | /* client data associated with the LB server communication */ |
| 312 | /************************************************************/ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 313 | /* Status from the LB server has been received. This signals the end of the LB |
| 314 | * call. */ |
| 315 | grpc_closure lb_on_server_status_received; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 316 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 317 | /* A response from the LB server has been received. Process it */ |
| 318 | grpc_closure lb_on_response_received; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 319 | |
| 320 | grpc_call *lb_call; /* streaming call to the LB server, */ |
| 321 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 322 | grpc_metadata_array lb_initial_metadata_recv; /* initial MD from LB server */ |
| 323 | grpc_metadata_array |
| 324 | lb_trailing_metadata_recv; /* trailing MD from LB server */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 325 | |
| 326 | /* what's being sent to the LB server. Note that its value may vary if the LB |
| 327 | * server indicates a redirect. */ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 328 | grpc_byte_buffer *lb_request_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 329 | |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 330 | /* response the LB server, if any. Processed in lb_on_response_received() */ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 331 | grpc_byte_buffer *lb_response_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 332 | |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 333 | /* call status code and details, set in lb_on_server_status_received() */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 334 | grpc_status_code lb_call_status; |
| 335 | char *lb_call_status_details; |
| 336 | size_t lb_call_status_details_capacity; |
| 337 | |
| 338 | /** LB call retry backoff state */ |
| 339 | gpr_backoff lb_call_backoff_state; |
| 340 | |
| 341 | /** LB call retry timer */ |
| 342 | grpc_timer lb_call_retry_timer; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 343 | } glb_lb_policy; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 344 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 345 | /* Keeps track and reacts to changes in connectivity of the RR instance */ |
| 346 | struct rr_connectivity_data { |
| 347 | grpc_closure on_change; |
| 348 | grpc_connectivity_state state; |
| 349 | glb_lb_policy *glb_policy; |
| 350 | }; |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 351 | |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 352 | static bool is_server_valid(const grpc_grpclb_server *server, size_t idx, |
| 353 | bool log) { |
| 354 | const grpc_grpclb_ip_address *ip = &server->ip_address; |
| 355 | if (server->port >> 16 != 0) { |
| 356 | if (log) { |
| 357 | gpr_log(GPR_ERROR, |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 358 | "Invalid port '%d' at index %lu of serverlist. Ignoring.", |
| 359 | server->port, (unsigned long)idx); |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 360 | } |
| 361 | return false; |
| 362 | } |
| 363 | |
| 364 | if (ip->size != 4 && ip->size != 16) { |
| 365 | if (log) { |
| 366 | gpr_log(GPR_ERROR, |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 367 | "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] | 368 | "serverlist. Ignoring", |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 369 | ip->size, (unsigned long)idx); |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 370 | } |
| 371 | return false; |
| 372 | } |
| 373 | return true; |
| 374 | } |
| 375 | |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 376 | /* vtable for LB tokens in grpc_lb_addresses. */ |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 377 | static void *lb_token_copy(void *token) { |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 378 | return token == NULL ? NULL : GRPC_MDELEM_REF(token); |
| 379 | } |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 380 | static void lb_token_destroy(grpc_exec_ctx *exec_ctx, void *token) { |
| 381 | if (token != NULL) GRPC_MDELEM_UNREF(exec_ctx, token); |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 382 | } |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 383 | static int lb_token_cmp(void *token1, void *token2) { |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 384 | if (token1 > token2) return 1; |
| 385 | if (token1 < token2) return -1; |
| 386 | return 0; |
| 387 | } |
| 388 | static const grpc_lb_user_data_vtable lb_token_vtable = { |
| 389 | lb_token_copy, lb_token_destroy, lb_token_cmp}; |
| 390 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 391 | static void parse_server(const grpc_grpclb_server *server, |
| 392 | grpc_resolved_address *addr) { |
| 393 | const uint16_t netorder_port = htons((uint16_t)server->port); |
| 394 | /* the addresses are given in binary format (a in(6)_addr struct) in |
| 395 | * server->ip_address.bytes. */ |
| 396 | const grpc_grpclb_ip_address *ip = &server->ip_address; |
| 397 | memset(addr, 0, sizeof(*addr)); |
| 398 | if (ip->size == 4) { |
| 399 | addr->len = sizeof(struct sockaddr_in); |
| 400 | struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr->addr; |
| 401 | addr4->sin_family = AF_INET; |
| 402 | memcpy(&addr4->sin_addr, ip->bytes, ip->size); |
| 403 | addr4->sin_port = netorder_port; |
| 404 | } else if (ip->size == 16) { |
| 405 | addr->len = sizeof(struct sockaddr_in6); |
| 406 | struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr->addr; |
David Garcia Quintas | 107ca16 | 2016-11-02 18:17:03 -0700 | [diff] [blame] | 407 | addr6->sin6_family = AF_INET6; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 408 | memcpy(&addr6->sin6_addr, ip->bytes, ip->size); |
| 409 | addr6->sin6_port = netorder_port; |
| 410 | } |
| 411 | } |
| 412 | |
Mark D. Roth | 7ce14d2 | 2016-09-16 13:03:46 -0700 | [diff] [blame] | 413 | /* Returns addresses extracted from \a serverlist. */ |
Mark D. Roth | 64f1f8d | 2016-09-16 09:00:09 -0700 | [diff] [blame] | 414 | static grpc_lb_addresses *process_serverlist( |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 415 | grpc_exec_ctx *exec_ctx, const grpc_grpclb_serverlist *serverlist) { |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 416 | size_t num_valid = 0; |
| 417 | /* first pass: count how many are valid in order to allocate the necessary |
| 418 | * memory in a single block */ |
| 419 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 420 | if (is_server_valid(serverlist->servers[i], i, true)) ++num_valid; |
David Garcia Quintas | b8b384a | 2016-08-23 21:10:29 -0700 | [diff] [blame] | 421 | } |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 422 | if (num_valid == 0) return NULL; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 423 | |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 424 | grpc_lb_addresses *lb_addresses = |
| 425 | grpc_lb_addresses_create(num_valid, &lb_token_vtable); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 426 | |
| 427 | /* 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] | 428 | * to the outside world) to be read by the RR policy during its creation. |
| 429 | * Given that the validity tests are very cheap, they are performed again |
| 430 | * instead of marking the valid ones during the first pass, as this would |
| 431 | * incurr in an allocation due to the arbitrary number of server */ |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 432 | size_t addr_idx = 0; |
| 433 | for (size_t sl_idx = 0; sl_idx < serverlist->num_servers; ++sl_idx) { |
| 434 | GPR_ASSERT(addr_idx < num_valid); |
| 435 | const grpc_grpclb_server *server = serverlist->servers[sl_idx]; |
| 436 | if (!is_server_valid(serverlist->servers[sl_idx], sl_idx, false)) continue; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 437 | |
| 438 | /* address processing */ |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 439 | grpc_resolved_address addr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 440 | parse_server(server, &addr); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 441 | |
| 442 | /* lb token processing */ |
Mark D. Roth | 64f1f8d | 2016-09-16 09:00:09 -0700 | [diff] [blame] | 443 | void *user_data; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 444 | if (server->has_load_balance_token) { |
David Garcia Quintas | 0baf1dc | 2016-10-28 04:44:01 +0200 | [diff] [blame] | 445 | const size_t lb_token_max_length = |
| 446 | GPR_ARRAY_SIZE(server->load_balance_token); |
| 447 | const size_t lb_token_length = |
| 448 | strnlen(server->load_balance_token, lb_token_max_length); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 449 | grpc_mdstr *lb_token_mdstr = grpc_mdstr_from_buffer( |
David Garcia Quintas | 0baf1dc | 2016-10-28 04:44:01 +0200 | [diff] [blame] | 450 | (uint8_t *)server->load_balance_token, lb_token_length); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 451 | user_data = grpc_mdelem_from_metadata_strings( |
| 452 | exec_ctx, GRPC_MDSTR_LB_TOKEN, lb_token_mdstr); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 453 | } else { |
| 454 | gpr_log(GPR_ERROR, |
| 455 | "Missing LB token for backend address '%s'. The empty token will " |
| 456 | "be used instead", |
murgatroid99 | 08b0fab | 2016-09-23 14:35:49 -0700 | [diff] [blame] | 457 | grpc_sockaddr_to_uri(&addr)); |
David Garcia Quintas | a3654db | 2016-10-11 15:52:39 -0700 | [diff] [blame] | 458 | user_data = GRPC_MDELEM_LB_TOKEN_EMPTY; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 459 | } |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 460 | |
Mark D. Roth | 64f1f8d | 2016-09-16 09:00:09 -0700 | [diff] [blame] | 461 | grpc_lb_addresses_set_address(lb_addresses, addr_idx, &addr.addr, addr.len, |
| 462 | false /* is_balancer */, |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 463 | NULL /* balancer_name */, user_data); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 464 | ++addr_idx; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 465 | } |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 466 | GPR_ASSERT(addr_idx == num_valid); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 467 | return lb_addresses; |
| 468 | } |
| 469 | |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 470 | /* perform a pick over \a rr_policy. Given that a pick can return immediately |
| 471 | * (ignoring its completion callback) we need to perform the cleanups this |
| 472 | * callback would be otherwise resposible for */ |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 473 | static bool pick_from_internal_rr_locked( |
| 474 | grpc_exec_ctx *exec_ctx, grpc_lb_policy *rr_policy, |
| 475 | const grpc_lb_policy_pick_args *pick_args, |
| 476 | grpc_connected_subchannel **target, wrapped_rr_closure_arg *wc_arg) { |
| 477 | GPR_ASSERT(rr_policy != NULL); |
| 478 | const bool pick_done = |
| 479 | grpc_lb_policy_pick(exec_ctx, rr_policy, pick_args, target, |
| 480 | (void **)&wc_arg->lb_token, &wc_arg->wrapper_closure); |
| 481 | if (pick_done) { |
| 482 | /* synchronous grpc_lb_policy_pick call. Unref the RR policy. */ |
| 483 | if (grpc_lb_glb_trace) { |
| 484 | gpr_log(GPR_INFO, "Unreffing RR (0x%" PRIxPTR ")", |
| 485 | (intptr_t)wc_arg->rr_policy); |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 486 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 487 | GRPC_LB_POLICY_UNREF(exec_ctx, wc_arg->rr_policy, "glb_pick_sync"); |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 488 | |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 489 | /* add the load reporting initial metadata */ |
| 490 | initial_metadata_add_lb_token(pick_args->initial_metadata, |
| 491 | pick_args->lb_token_mdelem_storage, |
| 492 | GRPC_MDELEM_REF(wc_arg->lb_token)); |
| 493 | |
| 494 | gpr_free(wc_arg); |
| 495 | } |
| 496 | /* else, the pending pick will be registered and taken care of by the |
| 497 | * pending pick list inside the RR policy (glb_policy->rr_policy). |
| 498 | * Eventually, wrapped_on_complete will be called, which will -among other |
| 499 | * things- add the LB token to the call's initial metadata */ |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 500 | return pick_done; |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 501 | } |
| 502 | |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 503 | static grpc_lb_policy *create_rr_locked( |
| 504 | grpc_exec_ctx *exec_ctx, const grpc_grpclb_serverlist *serverlist, |
| 505 | glb_lb_policy *glb_policy) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 506 | GPR_ASSERT(serverlist != NULL && serverlist->num_servers > 0); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 507 | |
| 508 | grpc_lb_policy_args args; |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 509 | memset(&args, 0, sizeof(args)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 510 | args.client_channel_factory = glb_policy->cc_factory; |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 511 | grpc_lb_addresses *addresses = process_serverlist(exec_ctx, serverlist); |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 512 | |
| 513 | // Replace the LB addresses in the channel args that we pass down to |
| 514 | // the subchannel. |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 515 | static const char *keys_to_remove[] = {GRPC_ARG_LB_ADDRESSES}; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 516 | const grpc_arg arg = grpc_lb_addresses_create_channel_arg(addresses); |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 517 | args.args = grpc_channel_args_copy_and_add_and_remove( |
| 518 | glb_policy->args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), &arg, |
| 519 | 1); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 520 | |
| 521 | grpc_lb_policy *rr = grpc_lb_policy_create(exec_ctx, "round_robin", &args); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 522 | GPR_ASSERT(rr != NULL); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 523 | grpc_lb_addresses_destroy(exec_ctx, addresses); |
| 524 | grpc_channel_args_destroy(exec_ctx, args.args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 525 | return rr; |
| 526 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 527 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 528 | static void glb_rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg, |
| 529 | grpc_error *error); |
| 530 | /* glb_policy->rr_policy may be NULL (initial handover) */ |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 531 | static void rr_handover_locked(grpc_exec_ctx *exec_ctx, |
| 532 | glb_lb_policy *glb_policy, grpc_error *error) { |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 533 | GPR_ASSERT(glb_policy->serverlist != NULL && |
| 534 | glb_policy->serverlist->num_servers > 0); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 535 | |
| 536 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 537 | gpr_log(GPR_INFO, "RR handover. Old RR: %p", (void *)glb_policy->rr_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 538 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 539 | if (glb_policy->rr_policy != NULL) { |
| 540 | /* if we are phasing out an existing RR instance, unref it. */ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 541 | GRPC_LB_POLICY_UNREF(exec_ctx, glb_policy->rr_policy, "rr_handover"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | glb_policy->rr_policy = |
| 545 | create_rr_locked(exec_ctx, glb_policy->serverlist, glb_policy); |
| 546 | if (grpc_lb_glb_trace) { |
| 547 | gpr_log(GPR_INFO, "Created RR policy (%p)", (void *)glb_policy->rr_policy); |
| 548 | } |
| 549 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 550 | GPR_ASSERT(glb_policy->rr_policy != NULL); |
Yuchen Zeng | b429164 | 2016-09-01 19:17:14 -0700 | [diff] [blame] | 551 | grpc_pollset_set_add_pollset_set(exec_ctx, |
| 552 | glb_policy->rr_policy->interested_parties, |
| 553 | glb_policy->base.interested_parties); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 554 | |
| 555 | rr_connectivity_data *rr_connectivity = |
| 556 | gpr_malloc(sizeof(rr_connectivity_data)); |
| 557 | memset(rr_connectivity, 0, sizeof(rr_connectivity_data)); |
| 558 | grpc_closure_init(&rr_connectivity->on_change, glb_rr_connectivity_changed, |
| 559 | rr_connectivity); |
| 560 | rr_connectivity->glb_policy = glb_policy; |
| 561 | rr_connectivity->state = grpc_lb_policy_check_connectivity( |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 562 | exec_ctx, glb_policy->rr_policy, &error); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 563 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 564 | grpc_connectivity_state_set(exec_ctx, &glb_policy->state_tracker, |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 565 | rr_connectivity->state, GRPC_ERROR_REF(error), |
| 566 | "rr_handover"); |
| 567 | /* subscribe */ |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 568 | GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "rr_connectivity_cb"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 569 | grpc_lb_policy_notify_on_state_change(exec_ctx, glb_policy->rr_policy, |
| 570 | &rr_connectivity->state, |
| 571 | &rr_connectivity->on_change); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 572 | grpc_lb_policy_exit_idle(exec_ctx, glb_policy->rr_policy); |
| 573 | |
| 574 | /* flush pending ops */ |
| 575 | pending_pick *pp; |
| 576 | while ((pp = glb_policy->pending_picks)) { |
| 577 | glb_policy->pending_picks = pp->next; |
| 578 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "rr_handover_pending_pick"); |
| 579 | pp->wrapped_on_complete_arg.rr_policy = glb_policy->rr_policy; |
| 580 | if (grpc_lb_glb_trace) { |
| 581 | gpr_log(GPR_INFO, "Pending pick about to PICK from 0x%" PRIxPTR "", |
| 582 | (intptr_t)glb_policy->rr_policy); |
| 583 | } |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 584 | pick_from_internal_rr_locked(exec_ctx, glb_policy->rr_policy, |
| 585 | &pp->pick_args, pp->target, |
| 586 | &pp->wrapped_on_complete_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | pending_ping *pping; |
| 590 | while ((pping = glb_policy->pending_pings)) { |
| 591 | glb_policy->pending_pings = pping->next; |
| 592 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "rr_handover_pending_ping"); |
| 593 | pping->wrapped_notify_arg.rr_policy = glb_policy->rr_policy; |
| 594 | if (grpc_lb_glb_trace) { |
| 595 | gpr_log(GPR_INFO, "Pending ping about to PING from 0x%" PRIxPTR "", |
| 596 | (intptr_t)glb_policy->rr_policy); |
| 597 | } |
| 598 | grpc_lb_policy_ping_one(exec_ctx, glb_policy->rr_policy, |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 599 | &pping->wrapped_notify_arg.wrapper_closure); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 600 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 601 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 602 | |
David Garcia Quintas | 348cfdb | 2016-08-19 12:19:43 -0700 | [diff] [blame] | 603 | static void glb_rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg, |
| 604 | grpc_error *error) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 605 | /* If shutdown or error free the arg. Rely on the rest of the code to set the |
| 606 | * right grpclb status. */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 607 | rr_connectivity_data *rr_conn_data = arg; |
| 608 | glb_lb_policy *glb_policy = rr_conn_data->glb_policy; |
David Garcia Quintas | 348cfdb | 2016-08-19 12:19:43 -0700 | [diff] [blame] | 609 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 610 | if (rr_conn_data->state != GRPC_CHANNEL_SHUTDOWN && |
| 611 | !glb_policy->shutting_down) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 612 | gpr_mu_lock(&glb_policy->mu); |
| 613 | /* RR not shutting down. Mimic the RR's policy state */ |
| 614 | grpc_connectivity_state_set(exec_ctx, &glb_policy->state_tracker, |
| 615 | rr_conn_data->state, GRPC_ERROR_REF(error), |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 616 | "rr_connectivity_cb"); |
| 617 | /* resubscribe. Reuse the "rr_connectivity_cb" weak ref. */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 618 | grpc_lb_policy_notify_on_state_change(exec_ctx, glb_policy->rr_policy, |
| 619 | &rr_conn_data->state, |
| 620 | &rr_conn_data->on_change); |
| 621 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 622 | } else { |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 623 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 624 | "rr_connectivity_cb"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 625 | gpr_free(rr_conn_data); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 626 | } |
| 627 | } |
| 628 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 629 | static grpc_lb_policy *glb_create(grpc_exec_ctx *exec_ctx, |
| 630 | grpc_lb_policy_factory *factory, |
| 631 | grpc_lb_policy_args *args) { |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 632 | /* Get server name. */ |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 633 | const grpc_arg *arg = |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 634 | grpc_channel_args_find(args->args, GRPC_ARG_SERVER_NAME); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 635 | const char *server_name = |
| 636 | arg != NULL && arg->type == GRPC_ARG_STRING ? arg->value.string : NULL; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 637 | |
Mark D. Roth | e011b1e | 2016-09-07 08:28:00 -0700 | [diff] [blame] | 638 | /* Count the number of gRPC-LB addresses. There must be at least one. |
| 639 | * TODO(roth): For now, we ignore non-balancer addresses, but in the |
| 640 | * future, we may change the behavior such that we fall back to using |
| 641 | * the non-balancer addresses if we cannot reach any balancers. At that |
| 642 | * time, this should be changed to allow a list with no balancer addresses, |
| 643 | * since the resolver might fail to return a balancer address even when |
| 644 | * this is the right LB policy to use. */ |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 645 | arg = grpc_channel_args_find(args->args, GRPC_ARG_LB_ADDRESSES); |
| 646 | GPR_ASSERT(arg != NULL && arg->type == GRPC_ARG_POINTER); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 647 | grpc_lb_addresses *addresses = arg->value.pointer.p; |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 648 | size_t num_grpclb_addrs = 0; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 649 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 650 | if (addresses->addresses[i].is_balancer) ++num_grpclb_addrs; |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 651 | } |
| 652 | if (num_grpclb_addrs == 0) return NULL; |
| 653 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 654 | glb_lb_policy *glb_policy = gpr_malloc(sizeof(*glb_policy)); |
| 655 | memset(glb_policy, 0, sizeof(*glb_policy)); |
| 656 | |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 657 | /* All input addresses in addresses come from a resolver that claims |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 658 | * they are LB services. It's the resolver's responsibility to make sure |
| 659 | * this |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 660 | * policy is only instantiated and used in that case. |
| 661 | * |
| 662 | * Create a client channel over them to communicate with a LB service */ |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 663 | glb_policy->server_name = gpr_strdup(server_name); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 664 | glb_policy->cc_factory = args->client_channel_factory; |
Mark D. Roth | 98abfd3 | 2016-10-21 08:10:51 -0700 | [diff] [blame] | 665 | glb_policy->args = grpc_channel_args_copy(args->args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 666 | GPR_ASSERT(glb_policy->cc_factory != NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 667 | |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 668 | /* construct a target from the addresses in args, given in the form |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 669 | * ipvX://ip1:port1,ip2:port2,... |
| 670 | * TODO(dgq): support mixed ip version */ |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 671 | char **addr_strs = gpr_malloc(sizeof(char *) * num_grpclb_addrs); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 672 | size_t addr_index = 0; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 673 | for (size_t i = 0; i < addresses->num_addresses; i++) { |
| 674 | if (addresses->addresses[i].user_data != NULL) { |
David Garcia Quintas | 5ebb7af | 2016-09-15 10:02:16 -0700 | [diff] [blame] | 675 | gpr_log(GPR_ERROR, |
| 676 | "This LB policy doesn't support user data. It will be ignored"); |
| 677 | } |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 678 | if (addresses->addresses[i].is_balancer) { |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 679 | if (addr_index == 0) { |
murgatroid99 | dedb923 | 2016-09-26 13:54:04 -0700 | [diff] [blame] | 680 | addr_strs[addr_index++] = |
Mark D. Roth | fb809b7 | 2016-10-26 09:12:25 -0700 | [diff] [blame] | 681 | grpc_sockaddr_to_uri(&addresses->addresses[i].address); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 682 | } else { |
Mark D. Roth | 49f89f0 | 2016-10-26 11:16:59 -0700 | [diff] [blame] | 683 | GPR_ASSERT(grpc_sockaddr_to_string(&addr_strs[addr_index++], |
| 684 | &addresses->addresses[i].address, |
| 685 | true) > 0); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 686 | } |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 687 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 688 | } |
| 689 | size_t uri_path_len; |
Mark D. Roth | 989cdcd | 2016-09-06 13:28:28 -0700 | [diff] [blame] | 690 | char *target_uri_str = gpr_strjoin_sep((const char **)addr_strs, |
| 691 | num_grpclb_addrs, ",", &uri_path_len); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 692 | |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 693 | /* Create a channel to talk to the LBs. |
| 694 | * |
| 695 | * We strip out the channel arg for the LB policy name, since we want |
| 696 | * to use the default (pick_first) in this case. |
| 697 | * |
| 698 | * We also strip out the channel arg for the resolved addresses, since |
| 699 | * that will be generated by the name resolver used in the LB channel. |
| 700 | * Note that the LB channel will use the sockaddr resolver, so this |
| 701 | * won't actually generate a query to DNS (or some other name service). |
| 702 | * However, the addresses returned by the sockaddr resolver will have |
| 703 | * is_balancer=false, whereas our own addresses have is_balancer=true. |
| 704 | * We need the LB channel to return addresses with is_balancer=false |
| 705 | * so that it does not wind up recursively using the grpclb LB policy, |
| 706 | * as per the special case logic in client_channel.c. |
| 707 | */ |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 708 | static const char *keys_to_remove[] = {GRPC_ARG_LB_POLICY_NAME, |
| 709 | GRPC_ARG_LB_ADDRESSES}; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 710 | grpc_channel_args *new_args = grpc_channel_args_copy_and_remove( |
| 711 | args->args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 712 | glb_policy->lb_channel = grpc_client_channel_factory_create_channel( |
| 713 | exec_ctx, glb_policy->cc_factory, target_uri_str, |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 714 | GRPC_CLIENT_CHANNEL_TYPE_LOAD_BALANCING, new_args); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 715 | grpc_channel_args_destroy(exec_ctx, new_args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 716 | |
| 717 | gpr_free(target_uri_str); |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 718 | for (size_t i = 0; i < num_grpclb_addrs; i++) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 719 | gpr_free(addr_strs[i]); |
| 720 | } |
| 721 | gpr_free(addr_strs); |
| 722 | |
| 723 | if (glb_policy->lb_channel == NULL) { |
| 724 | gpr_free(glb_policy); |
| 725 | return NULL; |
| 726 | } |
| 727 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 728 | grpc_lb_policy_init(&glb_policy->base, &glb_lb_policy_vtable); |
| 729 | gpr_mu_init(&glb_policy->mu); |
| 730 | grpc_connectivity_state_init(&glb_policy->state_tracker, GRPC_CHANNEL_IDLE, |
| 731 | "grpclb"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 732 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 733 | return &glb_policy->base; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 734 | } |
| 735 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 736 | static void glb_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 737 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 738 | GPR_ASSERT(glb_policy->pending_picks == NULL); |
| 739 | GPR_ASSERT(glb_policy->pending_pings == NULL); |
Mark D. Roth | d1604af | 2016-09-22 11:20:27 -0700 | [diff] [blame] | 740 | gpr_free((void *)glb_policy->server_name); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 741 | grpc_channel_args_destroy(exec_ctx, glb_policy->args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 742 | grpc_channel_destroy(glb_policy->lb_channel); |
| 743 | glb_policy->lb_channel = NULL; |
| 744 | grpc_connectivity_state_destroy(exec_ctx, &glb_policy->state_tracker); |
| 745 | if (glb_policy->serverlist != NULL) { |
| 746 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
| 747 | } |
| 748 | gpr_mu_destroy(&glb_policy->mu); |
| 749 | gpr_free(glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 750 | } |
| 751 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 752 | static void glb_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 753 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 754 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 755 | glb_policy->shutting_down = true; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 756 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 757 | pending_pick *pp = glb_policy->pending_picks; |
| 758 | glb_policy->pending_picks = NULL; |
| 759 | pending_ping *pping = glb_policy->pending_pings; |
| 760 | glb_policy->pending_pings = NULL; |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 761 | if (glb_policy->rr_policy) { |
| 762 | GRPC_LB_POLICY_UNREF(exec_ctx, glb_policy->rr_policy, "glb_shutdown"); |
| 763 | } |
| 764 | if (glb_policy->started_picking) { |
| 765 | if (glb_policy->lb_call != NULL) { |
| 766 | grpc_call_cancel(glb_policy->lb_call, NULL); |
| 767 | /* lb_on_server_status_received will pick up the cancel and clean up */ |
| 768 | } |
| 769 | } |
| 770 | grpc_connectivity_state_set( |
| 771 | exec_ctx, &glb_policy->state_tracker, GRPC_CHANNEL_SHUTDOWN, |
| 772 | GRPC_ERROR_CREATE("Channel Shutdown"), "glb_shutdown"); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 773 | gpr_mu_unlock(&glb_policy->mu); |
| 774 | |
| 775 | while (pp != NULL) { |
| 776 | pending_pick *next = pp->next; |
| 777 | *pp->target = NULL; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 778 | grpc_exec_ctx_sched(exec_ctx, &pp->wrapped_on_complete_arg.wrapper_closure, |
| 779 | GRPC_ERROR_NONE, NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 780 | pp = next; |
| 781 | } |
| 782 | |
| 783 | while (pping != NULL) { |
| 784 | pending_ping *next = pping->next; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 785 | grpc_exec_ctx_sched(exec_ctx, &pping->wrapped_notify_arg.wrapper_closure, |
| 786 | GRPC_ERROR_NONE, NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 787 | pping = next; |
| 788 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | static void glb_cancel_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 792 | grpc_connected_subchannel **target, |
| 793 | grpc_error *error) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 794 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 795 | gpr_mu_lock(&glb_policy->mu); |
| 796 | pending_pick *pp = glb_policy->pending_picks; |
| 797 | glb_policy->pending_picks = NULL; |
| 798 | while (pp != NULL) { |
| 799 | pending_pick *next = pp->next; |
| 800 | if (pp->target == target) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 801 | *target = NULL; |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 802 | grpc_exec_ctx_sched( |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 803 | exec_ctx, &pp->wrapped_on_complete_arg.wrapper_closure, |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 804 | GRPC_ERROR_CREATE_REFERENCING("Pick Cancelled", &error, 1), NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 805 | } else { |
| 806 | pp->next = glb_policy->pending_picks; |
| 807 | glb_policy->pending_picks = pp; |
| 808 | } |
| 809 | pp = next; |
| 810 | } |
| 811 | gpr_mu_unlock(&glb_policy->mu); |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 812 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 813 | } |
| 814 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 815 | static void glb_cancel_picks(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 816 | uint32_t initial_metadata_flags_mask, |
Mark D. Roth | e65ff11 | 2016-09-09 13:48:38 -0700 | [diff] [blame] | 817 | uint32_t initial_metadata_flags_eq, |
| 818 | grpc_error *error) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 819 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 820 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 821 | pending_pick *pp = glb_policy->pending_picks; |
| 822 | glb_policy->pending_picks = NULL; |
| 823 | while (pp != NULL) { |
| 824 | pending_pick *next = pp->next; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 825 | if ((pp->pick_args.initial_metadata_flags & initial_metadata_flags_mask) == |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 826 | initial_metadata_flags_eq) { |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 827 | grpc_exec_ctx_sched( |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 828 | exec_ctx, &pp->wrapped_on_complete_arg.wrapper_closure, |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 829 | GRPC_ERROR_CREATE_REFERENCING("Pick Cancelled", &error, 1), NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 830 | } else { |
| 831 | pp->next = glb_policy->pending_picks; |
| 832 | glb_policy->pending_picks = pp; |
| 833 | } |
| 834 | pp = next; |
| 835 | } |
| 836 | gpr_mu_unlock(&glb_policy->mu); |
Mark D. Roth | e65ff11 | 2016-09-09 13:48:38 -0700 | [diff] [blame] | 837 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 838 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 839 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 840 | static void query_for_backends_locked(grpc_exec_ctx *exec_ctx, |
| 841 | glb_lb_policy *glb_policy); |
| 842 | static void start_picking_locked(grpc_exec_ctx *exec_ctx, |
| 843 | glb_lb_policy *glb_policy) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 844 | glb_policy->started_picking = true; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 845 | gpr_backoff_reset(&glb_policy->lb_call_backoff_state); |
| 846 | query_for_backends_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 847 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 848 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 849 | static void glb_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 850 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 851 | gpr_mu_lock(&glb_policy->mu); |
| 852 | if (!glb_policy->started_picking) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 853 | start_picking_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 854 | } |
| 855 | gpr_mu_unlock(&glb_policy->mu); |
| 856 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 857 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 858 | static int glb_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 859 | const grpc_lb_policy_pick_args *pick_args, |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 860 | grpc_connected_subchannel **target, void **user_data, |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 861 | grpc_closure *on_complete) { |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 862 | if (pick_args->lb_token_mdelem_storage == NULL) { |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 863 | *target = NULL; |
David Garcia Quintas | 6cc44fc | 2016-09-12 23:04:35 -0700 | [diff] [blame] | 864 | grpc_exec_ctx_sched( |
| 865 | exec_ctx, on_complete, |
| 866 | GRPC_ERROR_CREATE("No mdelem storage for the LB token. Load reporting " |
| 867 | "won't work without it. Failing"), |
| 868 | NULL); |
Mark D. Roth | 1e5f6af | 2016-10-07 08:32:58 -0700 | [diff] [blame] | 869 | return 0; |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 870 | } |
| 871 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 872 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 873 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 5cf3c37 | 2016-10-03 14:30:03 -0700 | [diff] [blame] | 874 | glb_policy->deadline = pick_args->deadline; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 875 | bool pick_done; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 876 | |
| 877 | if (glb_policy->rr_policy != NULL) { |
| 878 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 879 | gpr_log(GPR_INFO, "grpclb %p about to PICK from RR %p", |
| 880 | (void *)glb_policy, (void *)glb_policy->rr_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 881 | } |
| 882 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "glb_pick"); |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 883 | |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 884 | wrapped_rr_closure_arg *wc_arg = gpr_malloc(sizeof(wrapped_rr_closure_arg)); |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 885 | memset(wc_arg, 0, sizeof(wrapped_rr_closure_arg)); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 886 | |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 887 | grpc_closure_init(&wc_arg->wrapper_closure, wrapped_rr_closure, wc_arg); |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 888 | wc_arg->rr_policy = glb_policy->rr_policy; |
| 889 | wc_arg->target = target; |
| 890 | wc_arg->wrapped_closure = on_complete; |
| 891 | wc_arg->lb_token_mdelem_storage = pick_args->lb_token_mdelem_storage; |
| 892 | wc_arg->initial_metadata = pick_args->initial_metadata; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 893 | wc_arg->free_when_done = wc_arg; |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 894 | pick_done = pick_from_internal_rr_locked(exec_ctx, glb_policy->rr_policy, |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 895 | pick_args, target, wc_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 896 | } else { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 897 | if (grpc_lb_glb_trace) { |
| 898 | gpr_log(GPR_DEBUG, |
| 899 | "No RR policy in grpclb instance %p. Adding to grpclb's pending " |
| 900 | "picks", |
| 901 | (void *)(glb_policy)); |
| 902 | } |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 903 | add_pending_pick(&glb_policy->pending_picks, pick_args, target, |
| 904 | on_complete); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 905 | |
| 906 | if (!glb_policy->started_picking) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 907 | start_picking_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 908 | } |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 909 | pick_done = false; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 910 | } |
| 911 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 912 | return pick_done; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 913 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 914 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 915 | static grpc_connectivity_state glb_check_connectivity( |
| 916 | grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 917 | grpc_error **connectivity_error) { |
| 918 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 919 | grpc_connectivity_state st; |
| 920 | gpr_mu_lock(&glb_policy->mu); |
| 921 | st = grpc_connectivity_state_check(&glb_policy->state_tracker, |
| 922 | connectivity_error); |
| 923 | gpr_mu_unlock(&glb_policy->mu); |
| 924 | return st; |
| 925 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 926 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 927 | static void glb_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 928 | grpc_closure *closure) { |
| 929 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 930 | gpr_mu_lock(&glb_policy->mu); |
| 931 | if (glb_policy->rr_policy) { |
| 932 | grpc_lb_policy_ping_one(exec_ctx, glb_policy->rr_policy, closure); |
| 933 | } else { |
| 934 | add_pending_ping(&glb_policy->pending_pings, closure); |
| 935 | if (!glb_policy->started_picking) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 936 | start_picking_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 937 | } |
| 938 | } |
| 939 | gpr_mu_unlock(&glb_policy->mu); |
| 940 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 941 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 942 | static void glb_notify_on_state_change(grpc_exec_ctx *exec_ctx, |
| 943 | grpc_lb_policy *pol, |
| 944 | grpc_connectivity_state *current, |
| 945 | grpc_closure *notify) { |
| 946 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 947 | gpr_mu_lock(&glb_policy->mu); |
| 948 | grpc_connectivity_state_notify_on_state_change( |
| 949 | exec_ctx, &glb_policy->state_tracker, current, notify); |
| 950 | |
| 951 | gpr_mu_unlock(&glb_policy->mu); |
| 952 | } |
| 953 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 954 | static void lb_on_server_status_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 955 | grpc_error *error); |
| 956 | static void lb_on_response_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 957 | grpc_error *error); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 958 | static void lb_call_init(grpc_exec_ctx *exec_ctx, glb_lb_policy *glb_policy) { |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 959 | GPR_ASSERT(glb_policy->server_name != NULL); |
| 960 | GPR_ASSERT(glb_policy->server_name[0] != '\0'); |
| 961 | |
David Garcia Quintas | 15eba13 | 2016-08-09 15:20:48 -0700 | [diff] [blame] | 962 | /* Note the following LB call progresses every time there's activity in \a |
| 963 | * glb_policy->base.interested_parties, which is comprised of the polling |
Yuchen Zeng | f7c45ae | 2016-09-15 13:40:32 -0700 | [diff] [blame] | 964 | * entities from \a client_channel. */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 965 | glb_policy->lb_call = grpc_channel_create_pollset_set_call( |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 966 | exec_ctx, glb_policy->lb_channel, NULL, GRPC_PROPAGATE_DEFAULTS, |
David Garcia Quintas | 4543e5c | 2016-09-22 15:09:34 -0700 | [diff] [blame] | 967 | glb_policy->base.interested_parties, |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 968 | "/grpc.lb.v1.LoadBalancer/BalanceLoad", glb_policy->server_name, |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 969 | glb_policy->deadline, NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 970 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 971 | grpc_metadata_array_init(&glb_policy->lb_initial_metadata_recv); |
| 972 | grpc_metadata_array_init(&glb_policy->lb_trailing_metadata_recv); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 973 | |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 974 | grpc_grpclb_request *request = |
| 975 | grpc_grpclb_request_create(glb_policy->server_name); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 976 | grpc_slice request_payload_slice = grpc_grpclb_request_encode(request); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 977 | glb_policy->lb_request_payload = |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 978 | grpc_raw_byte_buffer_create(&request_payload_slice, 1); |
Craig Tiller | 18b4ba3 | 2016-11-09 15:23:42 -0800 | [diff] [blame^] | 979 | grpc_slice_unref_internal(exec_ctx, request_payload_slice); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 980 | grpc_grpclb_request_destroy(request); |
| 981 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 982 | glb_policy->lb_call_status_details = NULL; |
| 983 | glb_policy->lb_call_status_details_capacity = 0; |
| 984 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 985 | grpc_closure_init(&glb_policy->lb_on_server_status_received, |
| 986 | lb_on_server_status_received, glb_policy); |
| 987 | grpc_closure_init(&glb_policy->lb_on_response_received, |
| 988 | lb_on_response_received, glb_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 989 | |
| 990 | gpr_backoff_init(&glb_policy->lb_call_backoff_state, BACKOFF_MULTIPLIER, |
| 991 | BACKOFF_JITTER, BACKOFF_MIN_SECONDS * 1000, |
| 992 | BACKOFF_MAX_SECONDS * 1000); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 993 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 994 | |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 995 | static void lb_call_destroy_locked(glb_lb_policy *glb_policy) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 996 | GPR_ASSERT(glb_policy->lb_call != NULL); |
| 997 | grpc_call_destroy(glb_policy->lb_call); |
| 998 | glb_policy->lb_call = NULL; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 999 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1000 | grpc_metadata_array_destroy(&glb_policy->lb_initial_metadata_recv); |
| 1001 | grpc_metadata_array_destroy(&glb_policy->lb_trailing_metadata_recv); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1002 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1003 | grpc_byte_buffer_destroy(glb_policy->lb_request_payload); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1004 | gpr_free(glb_policy->lb_call_status_details); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1005 | } |
| 1006 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1007 | /* |
| 1008 | * Auxiliary functions and LB client callbacks. |
| 1009 | */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1010 | static void query_for_backends_locked(grpc_exec_ctx *exec_ctx, |
| 1011 | glb_lb_policy *glb_policy) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1012 | GPR_ASSERT(glb_policy->lb_channel != NULL); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 1013 | lb_call_init(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1014 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1015 | if (grpc_lb_glb_trace) { |
| 1016 | gpr_log(GPR_INFO, "Query for backends (grpclb: %p, lb_call: %p)", |
| 1017 | (void *)glb_policy, (void *)glb_policy->lb_call); |
| 1018 | } |
| 1019 | GPR_ASSERT(glb_policy->lb_call != NULL); |
| 1020 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1021 | grpc_call_error call_error; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1022 | grpc_op ops[4]; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1023 | memset(ops, 0, sizeof(ops)); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1024 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1025 | grpc_op *op = ops; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1026 | op->op = GRPC_OP_SEND_INITIAL_METADATA; |
| 1027 | op->data.send_initial_metadata.count = 0; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1028 | op->flags = 0; |
| 1029 | op->reserved = NULL; |
| 1030 | op++; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1031 | |
| 1032 | op->op = GRPC_OP_RECV_INITIAL_METADATA; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1033 | op->data.recv_initial_metadata = &glb_policy->lb_initial_metadata_recv; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1034 | op->flags = 0; |
| 1035 | op->reserved = NULL; |
| 1036 | op++; |
| 1037 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1038 | GPR_ASSERT(glb_policy->lb_request_payload != NULL); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1039 | op->op = GRPC_OP_SEND_MESSAGE; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1040 | op->data.send_message = glb_policy->lb_request_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1041 | op->flags = 0; |
| 1042 | op->reserved = NULL; |
| 1043 | op++; |
| 1044 | |
| 1045 | op->op = GRPC_OP_RECV_STATUS_ON_CLIENT; |
| 1046 | op->data.recv_status_on_client.trailing_metadata = |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1047 | &glb_policy->lb_trailing_metadata_recv; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1048 | op->data.recv_status_on_client.status = &glb_policy->lb_call_status; |
| 1049 | op->data.recv_status_on_client.status_details = |
| 1050 | &glb_policy->lb_call_status_details; |
| 1051 | op->data.recv_status_on_client.status_details_capacity = |
| 1052 | &glb_policy->lb_call_status_details_capacity; |
| 1053 | op->flags = 0; |
| 1054 | op->reserved = NULL; |
| 1055 | op++; |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1056 | /* take a weak ref (won't prevent calling of \a glb_shutdown if the strong ref |
| 1057 | * count goes to zero) to be unref'd in lb_on_server_status_received */ |
| 1058 | GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "lb_on_server_status_received"); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1059 | call_error = grpc_call_start_batch_and_execute( |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1060 | exec_ctx, glb_policy->lb_call, ops, (size_t)(op - ops), |
| 1061 | &glb_policy->lb_on_server_status_received); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1062 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 1063 | |
| 1064 | op = ops; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1065 | op->op = GRPC_OP_RECV_MESSAGE; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1066 | op->data.recv_message = &glb_policy->lb_response_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1067 | op->flags = 0; |
| 1068 | op->reserved = NULL; |
| 1069 | op++; |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1070 | /* take another weak ref to be unref'd in lb_on_response_received */ |
| 1071 | GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "lb_on_response_received"); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1072 | call_error = grpc_call_start_batch_and_execute( |
| 1073 | exec_ctx, glb_policy->lb_call, ops, (size_t)(op - ops), |
| 1074 | &glb_policy->lb_on_response_received); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 1075 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1076 | } |
| 1077 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1078 | static void lb_on_response_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 1079 | grpc_error *error) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1080 | glb_lb_policy *glb_policy = arg; |
| 1081 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1082 | grpc_op ops[2]; |
| 1083 | memset(ops, 0, sizeof(ops)); |
| 1084 | grpc_op *op = ops; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1085 | if (glb_policy->lb_response_payload != NULL) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1086 | gpr_backoff_reset(&glb_policy->lb_call_backoff_state); |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 1087 | /* Received data from the LB server. Look inside |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1088 | * glb_policy->lb_response_payload, for a serverlist. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1089 | grpc_byte_buffer_reader bbr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1090 | grpc_byte_buffer_reader_init(&bbr, glb_policy->lb_response_payload); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 1091 | grpc_slice response_slice = grpc_byte_buffer_reader_readall(&bbr); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1092 | grpc_byte_buffer_destroy(glb_policy->lb_response_payload); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1093 | grpc_grpclb_serverlist *serverlist = |
| 1094 | grpc_grpclb_response_parse_serverlist(response_slice); |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1095 | if (serverlist != NULL) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1096 | GPR_ASSERT(glb_policy->lb_call != NULL); |
Craig Tiller | 18b4ba3 | 2016-11-09 15:23:42 -0800 | [diff] [blame^] | 1097 | grpc_slice_unref_internal(exec_ctx, response_slice); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1098 | if (grpc_lb_glb_trace) { |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 1099 | gpr_log(GPR_INFO, "Serverlist with %lu servers received", |
| 1100 | (unsigned long)serverlist->num_servers); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1101 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
| 1102 | grpc_resolved_address addr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1103 | parse_server(serverlist->servers[i], &addr); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1104 | char *ipport; |
| 1105 | grpc_sockaddr_to_string(&ipport, &addr, false); |
| 1106 | gpr_log(GPR_INFO, "Serverlist[%lu]: %s", (unsigned long)i, ipport); |
| 1107 | gpr_free(ipport); |
| 1108 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1109 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1110 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1111 | /* update serverlist */ |
| 1112 | if (serverlist->num_servers > 0) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1113 | gpr_mu_lock(&glb_policy->mu); |
| 1114 | if (grpc_grpclb_serverlist_equals(glb_policy->serverlist, serverlist)) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1115 | if (grpc_lb_glb_trace) { |
| 1116 | gpr_log(GPR_INFO, |
| 1117 | "Incoming server list identical to current, ignoring."); |
| 1118 | } |
| 1119 | } else { /* new serverlist */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1120 | if (glb_policy->serverlist != NULL) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1121 | /* dispose of the old serverlist */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1122 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1123 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1124 | /* and update the copy in the glb_lb_policy instance */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1125 | glb_policy->serverlist = serverlist; |
| 1126 | |
| 1127 | rr_handover_locked(exec_ctx, glb_policy, error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1128 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1129 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1130 | } else { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1131 | if (grpc_lb_glb_trace) { |
| 1132 | gpr_log(GPR_INFO, |
| 1133 | "Received empty server list. Picks will stay pending until a " |
| 1134 | "response with > 0 servers is received"); |
| 1135 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1136 | } |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1137 | } else { /* serverlist == NULL */ |
| 1138 | gpr_log(GPR_ERROR, "Invalid LB response received: '%s'. Ignoring.", |
Craig Tiller | 32df467 | 2016-11-04 08:21:56 -0700 | [diff] [blame] | 1139 | grpc_dump_slice(response_slice, GPR_DUMP_ASCII | GPR_DUMP_HEX)); |
Craig Tiller | 18b4ba3 | 2016-11-09 15:23:42 -0800 | [diff] [blame^] | 1140 | grpc_slice_unref_internal(exec_ctx, response_slice); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1141 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1142 | |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 1143 | if (!glb_policy->shutting_down) { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1144 | /* keep listening for serverlist updates */ |
| 1145 | op->op = GRPC_OP_RECV_MESSAGE; |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 1146 | op->data.recv_message = &glb_policy->lb_response_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1147 | op->flags = 0; |
| 1148 | op->reserved = NULL; |
| 1149 | op++; |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1150 | /* reuse the "lb_on_response_received" weak ref taken in |
| 1151 | * query_for_backends_locked() */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1152 | const grpc_call_error call_error = grpc_call_start_batch_and_execute( |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 1153 | exec_ctx, glb_policy->lb_call, ops, (size_t)(op - ops), |
| 1154 | &glb_policy->lb_on_response_received); /* loop */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1155 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1156 | } |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1157 | } else { /* empty payload: call cancelled. */ |
| 1158 | /* dispose of the "lb_on_response_received" weak ref taken in |
| 1159 | * query_for_backends_locked() and reused in every reception loop */ |
| 1160 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
| 1161 | "lb_on_response_received_empty_payload"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1162 | } |
| 1163 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1164 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1165 | static void lb_call_on_retry_timer(grpc_exec_ctx *exec_ctx, void *arg, |
| 1166 | grpc_error *error) { |
| 1167 | glb_lb_policy *glb_policy = arg; |
| 1168 | gpr_mu_lock(&glb_policy->mu); |
| 1169 | |
| 1170 | if (!glb_policy->shutting_down) { |
| 1171 | if (grpc_lb_glb_trace) { |
| 1172 | gpr_log(GPR_INFO, "Restaring call to LB server (grpclb %p)", |
| 1173 | (void *)glb_policy); |
| 1174 | } |
| 1175 | GPR_ASSERT(glb_policy->lb_call == NULL); |
| 1176 | query_for_backends_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1177 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1178 | gpr_mu_unlock(&glb_policy->mu); |
| 1179 | |
| 1180 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
| 1181 | "grpclb_on_retry_timer"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1182 | } |
| 1183 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1184 | static void lb_on_server_status_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 1185 | grpc_error *error) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1186 | glb_lb_policy *glb_policy = arg; |
| 1187 | gpr_mu_lock(&glb_policy->mu); |
| 1188 | |
| 1189 | GPR_ASSERT(glb_policy->lb_call != NULL); |
| 1190 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1191 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1192 | gpr_log(GPR_DEBUG, |
| 1193 | "Status from LB server received. Status = %d, Details = '%s', " |
| 1194 | "(call: %p)", |
| 1195 | glb_policy->lb_call_status, glb_policy->lb_call_status_details, |
| 1196 | (void *)glb_policy->lb_call); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1197 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1198 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1199 | /* We need to performe cleanups no matter what. */ |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 1200 | lb_call_destroy_locked(glb_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1201 | |
| 1202 | if (!glb_policy->shutting_down) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1203 | /* if we aren't shutting down, restart the LB client call after some time */ |
| 1204 | gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); |
| 1205 | gpr_timespec next_try = |
| 1206 | gpr_backoff_step(&glb_policy->lb_call_backoff_state, now); |
| 1207 | if (grpc_lb_glb_trace) { |
| 1208 | gpr_log(GPR_DEBUG, "Connection to LB server lost (grpclb: %p)...", |
| 1209 | (void *)glb_policy); |
| 1210 | gpr_timespec timeout = gpr_time_sub(next_try, now); |
| 1211 | if (gpr_time_cmp(timeout, gpr_time_0(timeout.clock_type)) > 0) { |
| 1212 | gpr_log(GPR_DEBUG, "... retrying in %" PRId64 ".%09d seconds.", |
| 1213 | timeout.tv_sec, timeout.tv_nsec); |
| 1214 | } else { |
| 1215 | gpr_log(GPR_DEBUG, "... retrying immediately."); |
| 1216 | } |
| 1217 | } |
| 1218 | GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "grpclb_retry_timer"); |
| 1219 | grpc_timer_init(exec_ctx, &glb_policy->lb_call_retry_timer, next_try, |
| 1220 | lb_call_on_retry_timer, glb_policy, now); |
| 1221 | } |
| 1222 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1223 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
| 1224 | "lb_on_server_status_received"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1225 | } |
| 1226 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1227 | /* Code wiring the policy with the rest of the core */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1228 | static const grpc_lb_policy_vtable glb_lb_policy_vtable = { |
| 1229 | glb_destroy, glb_shutdown, glb_pick, |
| 1230 | glb_cancel_pick, glb_cancel_picks, glb_ping_one, |
| 1231 | glb_exit_idle, glb_check_connectivity, glb_notify_on_state_change}; |
| 1232 | |
| 1233 | static void glb_factory_ref(grpc_lb_policy_factory *factory) {} |
| 1234 | |
| 1235 | static void glb_factory_unref(grpc_lb_policy_factory *factory) {} |
| 1236 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1237 | static const grpc_lb_policy_factory_vtable glb_factory_vtable = { |
| 1238 | glb_factory_ref, glb_factory_unref, glb_create, "grpclb"}; |
| 1239 | |
| 1240 | static grpc_lb_policy_factory glb_lb_policy_factory = {&glb_factory_vtable}; |
| 1241 | |
| 1242 | grpc_lb_policy_factory *grpc_glb_lb_factory_create() { |
| 1243 | return &glb_lb_policy_factory; |
| 1244 | } |
| 1245 | |
| 1246 | /* Plugin registration */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1247 | void grpc_lb_policy_grpclb_init() { |
| 1248 | grpc_register_lb_policy(grpc_glb_lb_factory_create()); |
| 1249 | grpc_register_tracer("glb", &grpc_lb_glb_trace); |
| 1250 | } |
| 1251 | |
| 1252 | void grpc_lb_policy_grpclb_shutdown() {} |