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 | 0f31080 | 2016-10-26 16:25:56 -0700 | [diff] [blame] | 119 | #include "src/core/lib/slice/slice_string_helpers.h" |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 120 | #include "src/core/lib/support/backoff.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 121 | #include "src/core/lib/support/string.h" |
| 122 | #include "src/core/lib/surface/call.h" |
| 123 | #include "src/core/lib/surface/channel.h" |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 124 | #include "src/core/lib/transport/static_metadata.h" |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 125 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 126 | #define BACKOFF_MULTIPLIER 1.6 |
| 127 | #define BACKOFF_JITTER 0.2 |
| 128 | #define BACKOFF_MIN_SECONDS 10 |
| 129 | #define BACKOFF_MAX_SECONDS 60 |
| 130 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 131 | int grpc_lb_glb_trace = 0; |
| 132 | |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 133 | /* add lb_token of selected subchannel (address) to the call's initial |
| 134 | * metadata */ |
| 135 | static void initial_metadata_add_lb_token( |
| 136 | grpc_metadata_batch *initial_metadata, |
| 137 | grpc_linked_mdelem *lb_token_mdelem_storage, grpc_mdelem *lb_token) { |
| 138 | GPR_ASSERT(lb_token_mdelem_storage != NULL); |
| 139 | GPR_ASSERT(lb_token != NULL); |
| 140 | grpc_metadata_batch_add_tail(initial_metadata, lb_token_mdelem_storage, |
| 141 | lb_token); |
| 142 | } |
| 143 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 144 | typedef struct wrapped_rr_closure_arg { |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 145 | /* the closure instance using this struct as argument */ |
| 146 | grpc_closure wrapper_closure; |
| 147 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 148 | /* the original closure. Usually a on_complete/notify cb for pick() and ping() |
| 149 | * calls against the internal RR instance, respectively. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 150 | grpc_closure *wrapped_closure; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 151 | |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 152 | /* the pick's initial metadata, kept in order to append the LB token for the |
| 153 | * pick */ |
| 154 | grpc_metadata_batch *initial_metadata; |
| 155 | |
| 156 | /* the picked target, used to determine which LB token to add to the pick's |
| 157 | * initial metadata */ |
| 158 | grpc_connected_subchannel **target; |
| 159 | |
| 160 | /* the LB token associated with the pick */ |
| 161 | grpc_mdelem *lb_token; |
| 162 | |
| 163 | /* storage for the lb token initial metadata mdelem */ |
| 164 | grpc_linked_mdelem *lb_token_mdelem_storage; |
| 165 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 166 | /* The RR instance related to the closure */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 167 | grpc_lb_policy *rr_policy; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 168 | |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 169 | /* heap memory to be freed upon closure execution. */ |
| 170 | void *free_when_done; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 171 | } wrapped_rr_closure_arg; |
| 172 | |
| 173 | /* The \a on_complete closure passed as part of the pick requires keeping a |
| 174 | * reference to its associated round robin instance. We wrap this closure in |
| 175 | * order to unref the round robin instance upon its invocation */ |
| 176 | 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] | 177 | grpc_error *error) { |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 178 | wrapped_rr_closure_arg *wc_arg = arg; |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 179 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 180 | GPR_ASSERT(wc_arg->wrapped_closure != NULL); |
| 181 | grpc_exec_ctx_sched(exec_ctx, wc_arg->wrapped_closure, GRPC_ERROR_REF(error), |
| 182 | NULL); |
| 183 | |
| 184 | if (wc_arg->rr_policy != NULL) { |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 185 | /* if target is NULL, no pick has been made by the RR policy (eg, all |
| 186 | * addresses failed to connect). There won't be any user_data/token |
| 187 | * available */ |
| 188 | if (wc_arg->target != NULL) { |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame^] | 189 | if (wc_arg->lb_token != 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 | } else { |
| 194 | gpr_log(GPR_ERROR, |
| 195 | "No LB token for connected subchannel pick %p (from RR " |
| 196 | "instance %p).", |
| 197 | (void *)*wc_arg->target, (void *)wc_arg->rr_policy); |
| 198 | abort(); |
| 199 | } |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 200 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 201 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame^] | 202 | gpr_log(GPR_INFO, "Unreffing RR %p", (void *)wc_arg->rr_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 203 | } |
| 204 | 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] | 205 | } |
David Garcia Quintas | b39330d | 2016-10-14 13:35:56 -0700 | [diff] [blame] | 206 | GPR_ASSERT(wc_arg->free_when_done != NULL); |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 207 | gpr_free(wc_arg->free_when_done); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 208 | } |
| 209 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 210 | /* Linked list of pending pick requests. It stores all information needed to |
| 211 | * eventually call (Round Robin's) pick() on them. They mainly stay pending |
| 212 | * waiting for the RR policy to be created/updated. |
| 213 | * |
| 214 | * One particularity is the wrapping of the user-provided \a on_complete closure |
| 215 | * (in \a wrapped_on_complete and \a wrapped_on_complete_arg). This is needed in |
| 216 | * order to correctly unref the RR policy instance upon completion of the pick. |
| 217 | * See \a wrapped_rr_closure for details. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 218 | typedef struct pending_pick { |
| 219 | struct pending_pick *next; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 220 | |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 221 | /* original pick()'s arguments */ |
| 222 | grpc_lb_policy_pick_args pick_args; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 223 | |
| 224 | /* output argument where to store the pick()ed connected subchannel, or NULL |
| 225 | * upon error. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 226 | grpc_connected_subchannel **target; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 227 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 228 | /* args for wrapped_on_complete */ |
| 229 | wrapped_rr_closure_arg wrapped_on_complete_arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 230 | } pending_pick; |
| 231 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 232 | static void add_pending_pick(pending_pick **root, |
| 233 | const grpc_lb_policy_pick_args *pick_args, |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 234 | grpc_connected_subchannel **target, |
| 235 | grpc_closure *on_complete) { |
| 236 | pending_pick *pp = gpr_malloc(sizeof(*pp)); |
| 237 | memset(pp, 0, sizeof(pending_pick)); |
| 238 | memset(&pp->wrapped_on_complete_arg, 0, sizeof(wrapped_rr_closure_arg)); |
| 239 | pp->next = *root; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 240 | pp->pick_args = *pick_args; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 241 | pp->target = target; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 242 | pp->wrapped_on_complete_arg.wrapped_closure = on_complete; |
David Garcia Quintas | 5bb7b9c | 2016-09-15 23:46:32 -0700 | [diff] [blame] | 243 | pp->wrapped_on_complete_arg.target = target; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 244 | pp->wrapped_on_complete_arg.initial_metadata = pick_args->initial_metadata; |
| 245 | pp->wrapped_on_complete_arg.lb_token_mdelem_storage = |
| 246 | pick_args->lb_token_mdelem_storage; |
David Garcia Quintas | b39330d | 2016-10-14 13:35:56 -0700 | [diff] [blame] | 247 | pp->wrapped_on_complete_arg.free_when_done = pp; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 248 | grpc_closure_init(&pp->wrapped_on_complete_arg.wrapper_closure, |
| 249 | wrapped_rr_closure, &pp->wrapped_on_complete_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 250 | *root = pp; |
| 251 | } |
| 252 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 253 | /* Same as the \a pending_pick struct but for ping operations */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 254 | typedef struct pending_ping { |
| 255 | struct pending_ping *next; |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 256 | |
David Garcia Quintas | 4333984 | 2016-07-18 12:56:09 -0700 | [diff] [blame] | 257 | /* args for wrapped_notify */ |
| 258 | wrapped_rr_closure_arg wrapped_notify_arg; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 259 | } pending_ping; |
| 260 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 261 | static void add_pending_ping(pending_ping **root, grpc_closure *notify) { |
| 262 | pending_ping *pping = gpr_malloc(sizeof(*pping)); |
| 263 | memset(pping, 0, sizeof(pending_ping)); |
| 264 | memset(&pping->wrapped_notify_arg, 0, sizeof(wrapped_rr_closure_arg)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 265 | pping->wrapped_notify_arg.wrapped_closure = notify; |
David Garcia Quintas | b39330d | 2016-10-14 13:35:56 -0700 | [diff] [blame] | 266 | pping->wrapped_notify_arg.free_when_done = pping; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 267 | pping->next = *root; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 268 | grpc_closure_init(&pping->wrapped_notify_arg.wrapper_closure, |
| 269 | wrapped_rr_closure, &pping->wrapped_notify_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 270 | *root = pping; |
| 271 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 272 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 273 | /* |
| 274 | * glb_lb_policy |
| 275 | */ |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 276 | typedef struct rr_connectivity_data rr_connectivity_data; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 277 | static const grpc_lb_policy_vtable glb_lb_policy_vtable; |
| 278 | typedef struct glb_lb_policy { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 279 | /** base policy: must be first */ |
| 280 | grpc_lb_policy base; |
| 281 | |
| 282 | /** mutex protecting remaining members */ |
| 283 | gpr_mu mu; |
| 284 | |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 285 | /** who the client is trying to communicate with */ |
Mark D. Roth | d1604af | 2016-09-22 11:20:27 -0700 | [diff] [blame] | 286 | const char *server_name; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 287 | grpc_client_channel_factory *cc_factory; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 288 | grpc_channel_args *args; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 289 | |
David Garcia Quintas | 5cf3c37 | 2016-10-03 14:30:03 -0700 | [diff] [blame] | 290 | /** deadline for the LB's call */ |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 291 | gpr_timespec deadline; |
| 292 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 293 | /** for communicating with the LB server */ |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 294 | grpc_channel *lb_channel; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 295 | |
| 296 | /** the RR policy to use of the backend servers returned by the LB server */ |
| 297 | grpc_lb_policy *rr_policy; |
| 298 | |
| 299 | bool started_picking; |
| 300 | |
| 301 | /** our connectivity state tracker */ |
| 302 | grpc_connectivity_state_tracker state_tracker; |
| 303 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 304 | /** stores the deserialized response from the LB. May be NULL until one such |
| 305 | * response has arrived. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 306 | grpc_grpclb_serverlist *serverlist; |
| 307 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 308 | /** list of picks that are waiting on RR's policy connectivity */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 309 | pending_pick *pending_picks; |
| 310 | |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 311 | /** list of pings that are waiting on RR's policy connectivity */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 312 | pending_ping *pending_pings; |
| 313 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 314 | bool shutting_down; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 315 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 316 | /************************************************************/ |
| 317 | /* client data associated with the LB server communication */ |
| 318 | /************************************************************/ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 319 | /* Status from the LB server has been received. This signals the end of the LB |
| 320 | * call. */ |
| 321 | grpc_closure lb_on_server_status_received; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 322 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 323 | /* A response from the LB server has been received. Process it */ |
| 324 | grpc_closure lb_on_response_received; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 325 | |
| 326 | grpc_call *lb_call; /* streaming call to the LB server, */ |
| 327 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 328 | grpc_metadata_array lb_initial_metadata_recv; /* initial MD from LB server */ |
| 329 | grpc_metadata_array |
| 330 | lb_trailing_metadata_recv; /* trailing MD from LB server */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 331 | |
| 332 | /* what's being sent to the LB server. Note that its value may vary if the LB |
| 333 | * server indicates a redirect. */ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 334 | grpc_byte_buffer *lb_request_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 335 | |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 336 | /* 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] | 337 | grpc_byte_buffer *lb_response_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 338 | |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 339 | /* 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] | 340 | grpc_status_code lb_call_status; |
| 341 | char *lb_call_status_details; |
| 342 | size_t lb_call_status_details_capacity; |
| 343 | |
| 344 | /** LB call retry backoff state */ |
| 345 | gpr_backoff lb_call_backoff_state; |
| 346 | |
| 347 | /** LB call retry timer */ |
| 348 | grpc_timer lb_call_retry_timer; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 349 | } glb_lb_policy; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 350 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 351 | /* Keeps track and reacts to changes in connectivity of the RR instance */ |
| 352 | struct rr_connectivity_data { |
| 353 | grpc_closure on_change; |
| 354 | grpc_connectivity_state state; |
| 355 | glb_lb_policy *glb_policy; |
| 356 | }; |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 357 | |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 358 | static bool is_server_valid(const grpc_grpclb_server *server, size_t idx, |
| 359 | bool log) { |
| 360 | const grpc_grpclb_ip_address *ip = &server->ip_address; |
| 361 | if (server->port >> 16 != 0) { |
| 362 | if (log) { |
| 363 | gpr_log(GPR_ERROR, |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 364 | "Invalid port '%d' at index %lu of serverlist. Ignoring.", |
| 365 | server->port, (unsigned long)idx); |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 366 | } |
| 367 | return false; |
| 368 | } |
| 369 | |
| 370 | if (ip->size != 4 && ip->size != 16) { |
| 371 | if (log) { |
| 372 | gpr_log(GPR_ERROR, |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 373 | "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] | 374 | "serverlist. Ignoring", |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 375 | ip->size, (unsigned long)idx); |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 376 | } |
| 377 | return false; |
| 378 | } |
| 379 | return true; |
| 380 | } |
| 381 | |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 382 | /* vtable for LB tokens in grpc_lb_addresses. */ |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 383 | static void *lb_token_copy(void *token) { |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 384 | return token == NULL ? NULL : GRPC_MDELEM_REF(token); |
| 385 | } |
| 386 | static void lb_token_destroy(void *token) { |
| 387 | if (token != NULL) GRPC_MDELEM_UNREF(token); |
| 388 | } |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 389 | static int lb_token_cmp(void *token1, void *token2) { |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 390 | if (token1 > token2) return 1; |
| 391 | if (token1 < token2) return -1; |
| 392 | return 0; |
| 393 | } |
| 394 | static const grpc_lb_user_data_vtable lb_token_vtable = { |
| 395 | lb_token_copy, lb_token_destroy, lb_token_cmp}; |
| 396 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 397 | static void parse_server(const grpc_grpclb_server *server, |
| 398 | grpc_resolved_address *addr) { |
| 399 | const uint16_t netorder_port = htons((uint16_t)server->port); |
| 400 | /* the addresses are given in binary format (a in(6)_addr struct) in |
| 401 | * server->ip_address.bytes. */ |
| 402 | const grpc_grpclb_ip_address *ip = &server->ip_address; |
| 403 | memset(addr, 0, sizeof(*addr)); |
| 404 | if (ip->size == 4) { |
| 405 | addr->len = sizeof(struct sockaddr_in); |
| 406 | struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr->addr; |
| 407 | addr4->sin_family = AF_INET; |
| 408 | memcpy(&addr4->sin_addr, ip->bytes, ip->size); |
| 409 | addr4->sin_port = netorder_port; |
| 410 | } else if (ip->size == 16) { |
| 411 | addr->len = sizeof(struct sockaddr_in6); |
| 412 | struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr->addr; |
David Garcia Quintas | 107ca16 | 2016-11-02 18:17:03 -0700 | [diff] [blame] | 413 | addr6->sin6_family = AF_INET6; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 414 | memcpy(&addr6->sin6_addr, ip->bytes, ip->size); |
| 415 | addr6->sin6_port = netorder_port; |
| 416 | } |
| 417 | } |
| 418 | |
Mark D. Roth | 7ce14d2 | 2016-09-16 13:03:46 -0700 | [diff] [blame] | 419 | /* Returns addresses extracted from \a serverlist. */ |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame^] | 420 | static grpc_lb_addresses *process_serverlist_locked( |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 421 | const grpc_grpclb_serverlist *serverlist) { |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 422 | size_t num_valid = 0; |
| 423 | /* first pass: count how many are valid in order to allocate the necessary |
| 424 | * memory in a single block */ |
| 425 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
David Garcia Quintas | 35c2aba | 2016-09-13 15:28:09 -0700 | [diff] [blame] | 426 | if (is_server_valid(serverlist->servers[i], i, true)) ++num_valid; |
David Garcia Quintas | b8b384a | 2016-08-23 21:10:29 -0700 | [diff] [blame] | 427 | } |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 428 | if (num_valid == 0) return NULL; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 429 | |
Mark D. Roth | 16883a3 | 2016-10-21 10:30:58 -0700 | [diff] [blame] | 430 | grpc_lb_addresses *lb_addresses = |
| 431 | grpc_lb_addresses_create(num_valid, &lb_token_vtable); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 432 | |
| 433 | /* 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] | 434 | * to the outside world) to be read by the RR policy during its creation. |
| 435 | * Given that the validity tests are very cheap, they are performed again |
| 436 | * instead of marking the valid ones during the first pass, as this would |
| 437 | * incurr in an allocation due to the arbitrary number of server */ |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 438 | size_t addr_idx = 0; |
| 439 | for (size_t sl_idx = 0; sl_idx < serverlist->num_servers; ++sl_idx) { |
| 440 | GPR_ASSERT(addr_idx < num_valid); |
| 441 | const grpc_grpclb_server *server = serverlist->servers[sl_idx]; |
| 442 | 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] | 443 | |
| 444 | /* address processing */ |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 445 | grpc_resolved_address addr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 446 | parse_server(server, &addr); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 447 | |
| 448 | /* lb token processing */ |
Mark D. Roth | 64f1f8d | 2016-09-16 09:00:09 -0700 | [diff] [blame] | 449 | void *user_data; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 450 | if (server->has_load_balance_token) { |
David Garcia Quintas | 0baf1dc | 2016-10-28 04:44:01 +0200 | [diff] [blame] | 451 | const size_t lb_token_max_length = |
| 452 | GPR_ARRAY_SIZE(server->load_balance_token); |
| 453 | const size_t lb_token_length = |
| 454 | strnlen(server->load_balance_token, lb_token_max_length); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 455 | grpc_mdstr *lb_token_mdstr = grpc_mdstr_from_buffer( |
David Garcia Quintas | 0baf1dc | 2016-10-28 04:44:01 +0200 | [diff] [blame] | 456 | (uint8_t *)server->load_balance_token, lb_token_length); |
David Garcia Quintas | a3654db | 2016-10-11 15:52:39 -0700 | [diff] [blame] | 457 | user_data = grpc_mdelem_from_metadata_strings(GRPC_MDSTR_LB_TOKEN, |
| 458 | lb_token_mdstr); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 459 | } else { |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame^] | 460 | char *uri = grpc_sockaddr_to_uri(&addr); |
| 461 | gpr_log(GPR_INFO, |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 462 | "Missing LB token for backend address '%s'. The empty token will " |
| 463 | "be used instead", |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame^] | 464 | uri); |
| 465 | gpr_free(uri); |
David Garcia Quintas | a3654db | 2016-10-11 15:52:39 -0700 | [diff] [blame] | 466 | user_data = GRPC_MDELEM_LB_TOKEN_EMPTY; |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 467 | } |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 468 | |
Mark D. Roth | 64f1f8d | 2016-09-16 09:00:09 -0700 | [diff] [blame] | 469 | grpc_lb_addresses_set_address(lb_addresses, addr_idx, &addr.addr, addr.len, |
| 470 | false /* is_balancer */, |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 471 | NULL /* balancer_name */, user_data); |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 472 | ++addr_idx; |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 473 | } |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 474 | GPR_ASSERT(addr_idx == num_valid); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 475 | return lb_addresses; |
| 476 | } |
| 477 | |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 478 | /* perform a pick over \a rr_policy. Given that a pick can return immediately |
| 479 | * (ignoring its completion callback) we need to perform the cleanups this |
| 480 | * callback would be otherwise resposible for */ |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 481 | static bool pick_from_internal_rr_locked( |
| 482 | grpc_exec_ctx *exec_ctx, grpc_lb_policy *rr_policy, |
| 483 | const grpc_lb_policy_pick_args *pick_args, |
| 484 | grpc_connected_subchannel **target, wrapped_rr_closure_arg *wc_arg) { |
| 485 | GPR_ASSERT(rr_policy != NULL); |
| 486 | const bool pick_done = |
| 487 | grpc_lb_policy_pick(exec_ctx, rr_policy, pick_args, target, |
| 488 | (void **)&wc_arg->lb_token, &wc_arg->wrapper_closure); |
| 489 | if (pick_done) { |
| 490 | /* synchronous grpc_lb_policy_pick call. Unref the RR policy. */ |
| 491 | if (grpc_lb_glb_trace) { |
| 492 | gpr_log(GPR_INFO, "Unreffing RR (0x%" PRIxPTR ")", |
| 493 | (intptr_t)wc_arg->rr_policy); |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 494 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 495 | 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] | 496 | |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 497 | /* add the load reporting initial metadata */ |
| 498 | initial_metadata_add_lb_token(pick_args->initial_metadata, |
| 499 | pick_args->lb_token_mdelem_storage, |
| 500 | GRPC_MDELEM_REF(wc_arg->lb_token)); |
| 501 | |
| 502 | gpr_free(wc_arg); |
| 503 | } |
| 504 | /* else, the pending pick will be registered and taken care of by the |
| 505 | * pending pick list inside the RR policy (glb_policy->rr_policy). |
| 506 | * Eventually, wrapped_on_complete will be called, which will -among other |
| 507 | * things- add the LB token to the call's initial metadata */ |
David Garcia Quintas | 2035906 | 2016-10-15 15:22:51 -0700 | [diff] [blame] | 508 | return pick_done; |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 509 | } |
| 510 | |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 511 | static grpc_lb_policy *create_rr_locked( |
| 512 | grpc_exec_ctx *exec_ctx, const grpc_grpclb_serverlist *serverlist, |
| 513 | glb_lb_policy *glb_policy) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 514 | GPR_ASSERT(serverlist != NULL && serverlist->num_servers > 0); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 515 | |
| 516 | grpc_lb_policy_args args; |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 517 | memset(&args, 0, sizeof(args)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 518 | args.client_channel_factory = glb_policy->cc_factory; |
David Garcia Quintas | 850cbaa | 2016-11-15 15:13:35 -0800 | [diff] [blame^] | 519 | grpc_lb_addresses *addresses = process_serverlist_locked(serverlist); |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 520 | |
| 521 | // Replace the LB addresses in the channel args that we pass down to |
| 522 | // the subchannel. |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 523 | static const char *keys_to_remove[] = {GRPC_ARG_LB_ADDRESSES}; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 524 | const grpc_arg arg = grpc_lb_addresses_create_channel_arg(addresses); |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 525 | args.args = grpc_channel_args_copy_and_add_and_remove( |
| 526 | glb_policy->args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), &arg, |
| 527 | 1); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 528 | |
| 529 | 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] | 530 | GPR_ASSERT(rr != NULL); |
| 531 | grpc_lb_addresses_destroy(addresses); |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 532 | grpc_channel_args_destroy(args.args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 533 | return rr; |
| 534 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 535 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 536 | static void glb_rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg, |
| 537 | grpc_error *error); |
| 538 | /* glb_policy->rr_policy may be NULL (initial handover) */ |
David Garcia Quintas | 90712d5 | 2016-10-13 19:33:04 -0700 | [diff] [blame] | 539 | static void rr_handover_locked(grpc_exec_ctx *exec_ctx, |
| 540 | glb_lb_policy *glb_policy, grpc_error *error) { |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 541 | GPR_ASSERT(glb_policy->serverlist != NULL && |
| 542 | glb_policy->serverlist->num_servers > 0); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 543 | |
| 544 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 545 | 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] | 546 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 547 | if (glb_policy->rr_policy != NULL) { |
| 548 | /* if we are phasing out an existing RR instance, unref it. */ |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 549 | 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] | 550 | } |
| 551 | |
| 552 | glb_policy->rr_policy = |
| 553 | create_rr_locked(exec_ctx, glb_policy->serverlist, glb_policy); |
| 554 | if (grpc_lb_glb_trace) { |
| 555 | gpr_log(GPR_INFO, "Created RR policy (%p)", (void *)glb_policy->rr_policy); |
| 556 | } |
| 557 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 558 | GPR_ASSERT(glb_policy->rr_policy != NULL); |
Yuchen Zeng | b429164 | 2016-09-01 19:17:14 -0700 | [diff] [blame] | 559 | grpc_pollset_set_add_pollset_set(exec_ctx, |
| 560 | glb_policy->rr_policy->interested_parties, |
| 561 | glb_policy->base.interested_parties); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 562 | |
| 563 | rr_connectivity_data *rr_connectivity = |
| 564 | gpr_malloc(sizeof(rr_connectivity_data)); |
| 565 | memset(rr_connectivity, 0, sizeof(rr_connectivity_data)); |
| 566 | grpc_closure_init(&rr_connectivity->on_change, glb_rr_connectivity_changed, |
| 567 | rr_connectivity); |
| 568 | rr_connectivity->glb_policy = glb_policy; |
| 569 | rr_connectivity->state = grpc_lb_policy_check_connectivity( |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 570 | exec_ctx, glb_policy->rr_policy, &error); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 571 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 572 | grpc_connectivity_state_set(exec_ctx, &glb_policy->state_tracker, |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 573 | rr_connectivity->state, GRPC_ERROR_REF(error), |
| 574 | "rr_handover"); |
| 575 | /* subscribe */ |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 576 | GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "rr_connectivity_cb"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 577 | grpc_lb_policy_notify_on_state_change(exec_ctx, glb_policy->rr_policy, |
| 578 | &rr_connectivity->state, |
| 579 | &rr_connectivity->on_change); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 580 | grpc_lb_policy_exit_idle(exec_ctx, glb_policy->rr_policy); |
| 581 | |
| 582 | /* flush pending ops */ |
| 583 | pending_pick *pp; |
| 584 | while ((pp = glb_policy->pending_picks)) { |
| 585 | glb_policy->pending_picks = pp->next; |
| 586 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "rr_handover_pending_pick"); |
| 587 | pp->wrapped_on_complete_arg.rr_policy = glb_policy->rr_policy; |
| 588 | if (grpc_lb_glb_trace) { |
| 589 | gpr_log(GPR_INFO, "Pending pick about to PICK from 0x%" PRIxPTR "", |
| 590 | (intptr_t)glb_policy->rr_policy); |
| 591 | } |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 592 | pick_from_internal_rr_locked(exec_ctx, glb_policy->rr_policy, |
| 593 | &pp->pick_args, pp->target, |
| 594 | &pp->wrapped_on_complete_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | pending_ping *pping; |
| 598 | while ((pping = glb_policy->pending_pings)) { |
| 599 | glb_policy->pending_pings = pping->next; |
| 600 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "rr_handover_pending_ping"); |
| 601 | pping->wrapped_notify_arg.rr_policy = glb_policy->rr_policy; |
| 602 | if (grpc_lb_glb_trace) { |
| 603 | gpr_log(GPR_INFO, "Pending ping about to PING from 0x%" PRIxPTR "", |
| 604 | (intptr_t)glb_policy->rr_policy); |
| 605 | } |
| 606 | grpc_lb_policy_ping_one(exec_ctx, glb_policy->rr_policy, |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 607 | &pping->wrapped_notify_arg.wrapper_closure); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 608 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 609 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 610 | |
David Garcia Quintas | 348cfdb | 2016-08-19 12:19:43 -0700 | [diff] [blame] | 611 | static void glb_rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg, |
| 612 | grpc_error *error) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 613 | /* If shutdown or error free the arg. Rely on the rest of the code to set the |
| 614 | * right grpclb status. */ |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 615 | rr_connectivity_data *rr_conn_data = arg; |
| 616 | glb_lb_policy *glb_policy = rr_conn_data->glb_policy; |
David Garcia Quintas | f953295 | 2016-11-08 14:14:25 -0800 | [diff] [blame] | 617 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 348cfdb | 2016-08-19 12:19:43 -0700 | [diff] [blame] | 618 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 619 | if (rr_conn_data->state != GRPC_CHANNEL_SHUTDOWN && |
| 620 | !glb_policy->shutting_down) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 621 | /* RR not shutting down. Mimic the RR's policy state */ |
| 622 | grpc_connectivity_state_set(exec_ctx, &glb_policy->state_tracker, |
| 623 | rr_conn_data->state, GRPC_ERROR_REF(error), |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 624 | "rr_connectivity_cb"); |
| 625 | /* resubscribe. Reuse the "rr_connectivity_cb" weak ref. */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 626 | grpc_lb_policy_notify_on_state_change(exec_ctx, glb_policy->rr_policy, |
| 627 | &rr_conn_data->state, |
| 628 | &rr_conn_data->on_change); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 629 | } else { |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 630 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 631 | "rr_connectivity_cb"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 632 | gpr_free(rr_conn_data); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 633 | } |
David Garcia Quintas | f953295 | 2016-11-08 14:14:25 -0800 | [diff] [blame] | 634 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 635 | } |
| 636 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 637 | static grpc_lb_policy *glb_create(grpc_exec_ctx *exec_ctx, |
| 638 | grpc_lb_policy_factory *factory, |
| 639 | grpc_lb_policy_args *args) { |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 640 | /* Get server name. */ |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 641 | const grpc_arg *arg = |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 642 | grpc_channel_args_find(args->args, GRPC_ARG_SERVER_NAME); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 643 | const char *server_name = |
| 644 | arg != NULL && arg->type == GRPC_ARG_STRING ? arg->value.string : NULL; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 645 | |
Mark D. Roth | e011b1e | 2016-09-07 08:28:00 -0700 | [diff] [blame] | 646 | /* Count the number of gRPC-LB addresses. There must be at least one. |
| 647 | * TODO(roth): For now, we ignore non-balancer addresses, but in the |
| 648 | * future, we may change the behavior such that we fall back to using |
| 649 | * the non-balancer addresses if we cannot reach any balancers. At that |
| 650 | * time, this should be changed to allow a list with no balancer addresses, |
| 651 | * since the resolver might fail to return a balancer address even when |
| 652 | * this is the right LB policy to use. */ |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 653 | arg = grpc_channel_args_find(args->args, GRPC_ARG_LB_ADDRESSES); |
| 654 | GPR_ASSERT(arg != NULL && arg->type == GRPC_ARG_POINTER); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 655 | grpc_lb_addresses *addresses = arg->value.pointer.p; |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 656 | size_t num_grpclb_addrs = 0; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 657 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 658 | if (addresses->addresses[i].is_balancer) ++num_grpclb_addrs; |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 659 | } |
| 660 | if (num_grpclb_addrs == 0) return NULL; |
| 661 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 662 | glb_lb_policy *glb_policy = gpr_malloc(sizeof(*glb_policy)); |
| 663 | memset(glb_policy, 0, sizeof(*glb_policy)); |
| 664 | |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 665 | /* All input addresses in addresses come from a resolver that claims |
David Garcia Quintas | f47d6fb | 2016-09-14 12:59:17 -0700 | [diff] [blame] | 666 | * they are LB services. It's the resolver's responsibility to make sure |
| 667 | * this |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 668 | * policy is only instantiated and used in that case. |
| 669 | * |
| 670 | * 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] | 671 | glb_policy->server_name = gpr_strdup(server_name); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 672 | glb_policy->cc_factory = args->client_channel_factory; |
Mark D. Roth | 98abfd3 | 2016-10-21 08:10:51 -0700 | [diff] [blame] | 673 | glb_policy->args = grpc_channel_args_copy(args->args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 674 | GPR_ASSERT(glb_policy->cc_factory != NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 675 | |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 676 | /* 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] | 677 | * ipvX://ip1:port1,ip2:port2,... |
| 678 | * TODO(dgq): support mixed ip version */ |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 679 | char **addr_strs = gpr_malloc(sizeof(char *) * num_grpclb_addrs); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 680 | size_t addr_index = 0; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 681 | for (size_t i = 0; i < addresses->num_addresses; i++) { |
| 682 | if (addresses->addresses[i].user_data != NULL) { |
David Garcia Quintas | 5ebb7af | 2016-09-15 10:02:16 -0700 | [diff] [blame] | 683 | gpr_log(GPR_ERROR, |
| 684 | "This LB policy doesn't support user data. It will be ignored"); |
| 685 | } |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 686 | if (addresses->addresses[i].is_balancer) { |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 687 | if (addr_index == 0) { |
murgatroid99 | dedb923 | 2016-09-26 13:54:04 -0700 | [diff] [blame] | 688 | addr_strs[addr_index++] = |
Mark D. Roth | fb809b7 | 2016-10-26 09:12:25 -0700 | [diff] [blame] | 689 | grpc_sockaddr_to_uri(&addresses->addresses[i].address); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 690 | } else { |
Mark D. Roth | 49f89f0 | 2016-10-26 11:16:59 -0700 | [diff] [blame] | 691 | GPR_ASSERT(grpc_sockaddr_to_string(&addr_strs[addr_index++], |
| 692 | &addresses->addresses[i].address, |
| 693 | true) > 0); |
Mark D. Roth | c5c3878 | 2016-09-16 08:51:01 -0700 | [diff] [blame] | 694 | } |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 695 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 696 | } |
| 697 | size_t uri_path_len; |
Mark D. Roth | 989cdcd | 2016-09-06 13:28:28 -0700 | [diff] [blame] | 698 | char *target_uri_str = gpr_strjoin_sep((const char **)addr_strs, |
| 699 | num_grpclb_addrs, ",", &uri_path_len); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 700 | |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 701 | /* Create a channel to talk to the LBs. |
| 702 | * |
| 703 | * We strip out the channel arg for the LB policy name, since we want |
| 704 | * to use the default (pick_first) in this case. |
| 705 | * |
| 706 | * We also strip out the channel arg for the resolved addresses, since |
| 707 | * that will be generated by the name resolver used in the LB channel. |
| 708 | * Note that the LB channel will use the sockaddr resolver, so this |
| 709 | * won't actually generate a query to DNS (or some other name service). |
| 710 | * However, the addresses returned by the sockaddr resolver will have |
| 711 | * is_balancer=false, whereas our own addresses have is_balancer=true. |
| 712 | * We need the LB channel to return addresses with is_balancer=false |
| 713 | * so that it does not wind up recursively using the grpclb LB policy, |
| 714 | * as per the special case logic in client_channel.c. |
| 715 | */ |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 716 | static const char *keys_to_remove[] = {GRPC_ARG_LB_POLICY_NAME, |
| 717 | GRPC_ARG_LB_ADDRESSES}; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 718 | grpc_channel_args *new_args = grpc_channel_args_copy_and_remove( |
| 719 | args->args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove)); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 720 | glb_policy->lb_channel = grpc_client_channel_factory_create_channel( |
| 721 | exec_ctx, glb_policy->cc_factory, target_uri_str, |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 722 | GRPC_CLIENT_CHANNEL_TYPE_LOAD_BALANCING, new_args); |
| 723 | grpc_channel_args_destroy(new_args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 724 | |
| 725 | gpr_free(target_uri_str); |
Mark D. Roth | f655c85 | 2016-09-06 10:40:38 -0700 | [diff] [blame] | 726 | for (size_t i = 0; i < num_grpclb_addrs; i++) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 727 | gpr_free(addr_strs[i]); |
| 728 | } |
| 729 | gpr_free(addr_strs); |
| 730 | |
| 731 | if (glb_policy->lb_channel == NULL) { |
| 732 | gpr_free(glb_policy); |
| 733 | return NULL; |
| 734 | } |
| 735 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 736 | grpc_lb_policy_init(&glb_policy->base, &glb_lb_policy_vtable); |
| 737 | gpr_mu_init(&glb_policy->mu); |
| 738 | grpc_connectivity_state_init(&glb_policy->state_tracker, GRPC_CHANNEL_IDLE, |
| 739 | "grpclb"); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 740 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 741 | return &glb_policy->base; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 742 | } |
| 743 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 744 | static void glb_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 745 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 746 | GPR_ASSERT(glb_policy->pending_picks == NULL); |
| 747 | GPR_ASSERT(glb_policy->pending_pings == NULL); |
Mark D. Roth | d1604af | 2016-09-22 11:20:27 -0700 | [diff] [blame] | 748 | gpr_free((void *)glb_policy->server_name); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 749 | grpc_channel_args_destroy(glb_policy->args); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 750 | grpc_channel_destroy(glb_policy->lb_channel); |
| 751 | glb_policy->lb_channel = NULL; |
| 752 | grpc_connectivity_state_destroy(exec_ctx, &glb_policy->state_tracker); |
| 753 | if (glb_policy->serverlist != NULL) { |
| 754 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
| 755 | } |
| 756 | gpr_mu_destroy(&glb_policy->mu); |
| 757 | gpr_free(glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 758 | } |
| 759 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 760 | static void glb_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 761 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 762 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 763 | glb_policy->shutting_down = true; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 764 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 765 | pending_pick *pp = glb_policy->pending_picks; |
| 766 | glb_policy->pending_picks = NULL; |
| 767 | pending_ping *pping = glb_policy->pending_pings; |
| 768 | glb_policy->pending_pings = NULL; |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 769 | if (glb_policy->rr_policy) { |
| 770 | GRPC_LB_POLICY_UNREF(exec_ctx, glb_policy->rr_policy, "glb_shutdown"); |
| 771 | } |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 772 | grpc_connectivity_state_set( |
| 773 | exec_ctx, &glb_policy->state_tracker, GRPC_CHANNEL_SHUTDOWN, |
| 774 | GRPC_ERROR_CREATE("Channel Shutdown"), "glb_shutdown"); |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 775 | /* We need a copy of the lb_call pointer because we can't cancell the call |
| 776 | * while holding glb_policy->mu: lb_on_server_status_received, invoked due to |
| 777 | * the cancel, needs to acquire that same lock */ |
| 778 | grpc_call *lb_call = glb_policy->lb_call; |
David Garcia Quintas | 3ddebf4 | 2016-11-14 13:18:53 -0800 | [diff] [blame] | 779 | glb_policy->lb_call = NULL; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 780 | gpr_mu_unlock(&glb_policy->mu); |
| 781 | |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 782 | /* glb_policy->lb_call and this local lb_call must be consistent at this point |
| 783 | * because glb_policy->lb_call is only assigned in lb_call_init_locked as part |
| 784 | * of query_for_backends_locked, which can only be invoked while |
| 785 | * glb_policy->shutting_down is false. */ |
| 786 | if (lb_call != NULL) { |
| 787 | grpc_call_cancel(lb_call, NULL); |
| 788 | /* lb_on_server_status_received will pick up the cancel and clean up */ |
| 789 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 790 | while (pp != NULL) { |
| 791 | pending_pick *next = pp->next; |
| 792 | *pp->target = NULL; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 793 | grpc_exec_ctx_sched(exec_ctx, &pp->wrapped_on_complete_arg.wrapper_closure, |
| 794 | GRPC_ERROR_NONE, NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 795 | pp = next; |
| 796 | } |
| 797 | |
| 798 | while (pping != NULL) { |
| 799 | pending_ping *next = pping->next; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 800 | grpc_exec_ctx_sched(exec_ctx, &pping->wrapped_notify_arg.wrapper_closure, |
| 801 | GRPC_ERROR_NONE, NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 802 | pping = next; |
| 803 | } |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | 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] | 807 | grpc_connected_subchannel **target, |
| 808 | grpc_error *error) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 809 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 810 | gpr_mu_lock(&glb_policy->mu); |
| 811 | pending_pick *pp = glb_policy->pending_picks; |
| 812 | glb_policy->pending_picks = NULL; |
| 813 | while (pp != NULL) { |
| 814 | pending_pick *next = pp->next; |
| 815 | if (pp->target == target) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 816 | *target = NULL; |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 817 | grpc_exec_ctx_sched( |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 818 | exec_ctx, &pp->wrapped_on_complete_arg.wrapper_closure, |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 819 | GRPC_ERROR_CREATE_REFERENCING("Pick Cancelled", &error, 1), NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 820 | } else { |
| 821 | pp->next = glb_policy->pending_picks; |
| 822 | glb_policy->pending_picks = pp; |
| 823 | } |
| 824 | pp = next; |
| 825 | } |
| 826 | gpr_mu_unlock(&glb_policy->mu); |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 827 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 828 | } |
| 829 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 830 | static void glb_cancel_picks(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 831 | uint32_t initial_metadata_flags_mask, |
Mark D. Roth | e65ff11 | 2016-09-09 13:48:38 -0700 | [diff] [blame] | 832 | uint32_t initial_metadata_flags_eq, |
| 833 | grpc_error *error) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 834 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 835 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 836 | pending_pick *pp = glb_policy->pending_picks; |
| 837 | glb_policy->pending_picks = NULL; |
| 838 | while (pp != NULL) { |
| 839 | pending_pick *next = pp->next; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 840 | if ((pp->pick_args.initial_metadata_flags & initial_metadata_flags_mask) == |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 841 | initial_metadata_flags_eq) { |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 842 | grpc_exec_ctx_sched( |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 843 | exec_ctx, &pp->wrapped_on_complete_arg.wrapper_closure, |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 844 | GRPC_ERROR_CREATE_REFERENCING("Pick Cancelled", &error, 1), NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 845 | } else { |
| 846 | pp->next = glb_policy->pending_picks; |
| 847 | glb_policy->pending_picks = pp; |
| 848 | } |
| 849 | pp = next; |
| 850 | } |
| 851 | gpr_mu_unlock(&glb_policy->mu); |
Mark D. Roth | e65ff11 | 2016-09-09 13:48:38 -0700 | [diff] [blame] | 852 | GRPC_ERROR_UNREF(error); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 853 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 854 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 855 | static void query_for_backends_locked(grpc_exec_ctx *exec_ctx, |
| 856 | glb_lb_policy *glb_policy); |
| 857 | static void start_picking_locked(grpc_exec_ctx *exec_ctx, |
| 858 | glb_lb_policy *glb_policy) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 859 | glb_policy->started_picking = true; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 860 | gpr_backoff_reset(&glb_policy->lb_call_backoff_state); |
| 861 | query_for_backends_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 862 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 863 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 864 | static void glb_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) { |
| 865 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 866 | gpr_mu_lock(&glb_policy->mu); |
| 867 | if (!glb_policy->started_picking) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 868 | start_picking_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 869 | } |
| 870 | gpr_mu_unlock(&glb_policy->mu); |
| 871 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 872 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 873 | 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] | 874 | const grpc_lb_policy_pick_args *pick_args, |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 875 | grpc_connected_subchannel **target, void **user_data, |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 876 | grpc_closure *on_complete) { |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 877 | if (pick_args->lb_token_mdelem_storage == NULL) { |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 878 | *target = NULL; |
David Garcia Quintas | 6cc44fc | 2016-09-12 23:04:35 -0700 | [diff] [blame] | 879 | grpc_exec_ctx_sched( |
| 880 | exec_ctx, on_complete, |
| 881 | GRPC_ERROR_CREATE("No mdelem storage for the LB token. Load reporting " |
| 882 | "won't work without it. Failing"), |
| 883 | NULL); |
Mark D. Roth | 1e5f6af | 2016-10-07 08:32:58 -0700 | [diff] [blame] | 884 | return 0; |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 885 | } |
| 886 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 887 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 888 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 5cf3c37 | 2016-10-03 14:30:03 -0700 | [diff] [blame] | 889 | glb_policy->deadline = pick_args->deadline; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 890 | bool pick_done; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 891 | |
| 892 | if (glb_policy->rr_policy != NULL) { |
| 893 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 894 | gpr_log(GPR_INFO, "grpclb %p about to PICK from RR %p", |
| 895 | (void *)glb_policy, (void *)glb_policy->rr_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 896 | } |
| 897 | GRPC_LB_POLICY_REF(glb_policy->rr_policy, "glb_pick"); |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 898 | |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 899 | 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] | 900 | memset(wc_arg, 0, sizeof(wrapped_rr_closure_arg)); |
David Garcia Quintas | 331b9c0 | 2016-09-12 18:37:05 -0700 | [diff] [blame] | 901 | |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 902 | 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] | 903 | wc_arg->rr_policy = glb_policy->rr_policy; |
| 904 | wc_arg->target = target; |
| 905 | wc_arg->wrapped_closure = on_complete; |
| 906 | wc_arg->lb_token_mdelem_storage = pick_args->lb_token_mdelem_storage; |
| 907 | wc_arg->initial_metadata = pick_args->initial_metadata; |
David Garcia Quintas | 97ba642 | 2016-10-14 13:06:45 -0700 | [diff] [blame] | 908 | wc_arg->free_when_done = wc_arg; |
David Garcia Quintas | 58c18e7 | 2016-10-14 15:23:45 -0700 | [diff] [blame] | 909 | 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] | 910 | pick_args, target, wc_arg); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 911 | } else { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 912 | if (grpc_lb_glb_trace) { |
| 913 | gpr_log(GPR_DEBUG, |
| 914 | "No RR policy in grpclb instance %p. Adding to grpclb's pending " |
| 915 | "picks", |
| 916 | (void *)(glb_policy)); |
| 917 | } |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 918 | add_pending_pick(&glb_policy->pending_picks, pick_args, target, |
| 919 | on_complete); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 920 | |
| 921 | if (!glb_policy->started_picking) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 922 | start_picking_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 923 | } |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 924 | pick_done = false; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 925 | } |
| 926 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 927 | return pick_done; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 928 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 929 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 930 | static grpc_connectivity_state glb_check_connectivity( |
| 931 | grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 932 | grpc_error **connectivity_error) { |
| 933 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 934 | grpc_connectivity_state st; |
| 935 | gpr_mu_lock(&glb_policy->mu); |
| 936 | st = grpc_connectivity_state_check(&glb_policy->state_tracker, |
| 937 | connectivity_error); |
| 938 | gpr_mu_unlock(&glb_policy->mu); |
| 939 | return st; |
| 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_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, |
| 943 | grpc_closure *closure) { |
| 944 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 945 | gpr_mu_lock(&glb_policy->mu); |
| 946 | if (glb_policy->rr_policy) { |
| 947 | grpc_lb_policy_ping_one(exec_ctx, glb_policy->rr_policy, closure); |
| 948 | } else { |
| 949 | add_pending_ping(&glb_policy->pending_pings, closure); |
| 950 | if (!glb_policy->started_picking) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 951 | start_picking_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 952 | } |
| 953 | } |
| 954 | gpr_mu_unlock(&glb_policy->mu); |
| 955 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 956 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 957 | static void glb_notify_on_state_change(grpc_exec_ctx *exec_ctx, |
| 958 | grpc_lb_policy *pol, |
| 959 | grpc_connectivity_state *current, |
| 960 | grpc_closure *notify) { |
| 961 | glb_lb_policy *glb_policy = (glb_lb_policy *)pol; |
| 962 | gpr_mu_lock(&glb_policy->mu); |
| 963 | grpc_connectivity_state_notify_on_state_change( |
| 964 | exec_ctx, &glb_policy->state_tracker, current, notify); |
| 965 | |
| 966 | gpr_mu_unlock(&glb_policy->mu); |
| 967 | } |
| 968 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 969 | static void lb_on_server_status_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 970 | grpc_error *error); |
| 971 | static void lb_on_response_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 972 | grpc_error *error); |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 973 | static void lb_call_init_locked(glb_lb_policy *glb_policy) { |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 974 | GPR_ASSERT(glb_policy->server_name != NULL); |
| 975 | GPR_ASSERT(glb_policy->server_name[0] != '\0'); |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 976 | GPR_ASSERT(!glb_policy->shutting_down); |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 977 | |
David Garcia Quintas | 15eba13 | 2016-08-09 15:20:48 -0700 | [diff] [blame] | 978 | /* Note the following LB call progresses every time there's activity in \a |
| 979 | * glb_policy->base.interested_parties, which is comprised of the polling |
Yuchen Zeng | f7c45ae | 2016-09-15 13:40:32 -0700 | [diff] [blame] | 980 | * entities from \a client_channel. */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 981 | glb_policy->lb_call = grpc_channel_create_pollset_set_call( |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 982 | glb_policy->lb_channel, NULL, GRPC_PROPAGATE_DEFAULTS, |
David Garcia Quintas | 4543e5c | 2016-09-22 15:09:34 -0700 | [diff] [blame] | 983 | glb_policy->base.interested_parties, |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 984 | "/grpc.lb.v1.LoadBalancer/BalanceLoad", glb_policy->server_name, |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 985 | glb_policy->deadline, NULL); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 986 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 987 | grpc_metadata_array_init(&glb_policy->lb_initial_metadata_recv); |
| 988 | grpc_metadata_array_init(&glb_policy->lb_trailing_metadata_recv); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 989 | |
David Garcia Quintas | 55ba14a | 2016-09-27 18:45:30 -0700 | [diff] [blame] | 990 | grpc_grpclb_request *request = |
| 991 | grpc_grpclb_request_create(glb_policy->server_name); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 992 | grpc_slice request_payload_slice = grpc_grpclb_request_encode(request); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 993 | glb_policy->lb_request_payload = |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 994 | grpc_raw_byte_buffer_create(&request_payload_slice, 1); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 995 | grpc_slice_unref(request_payload_slice); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 996 | grpc_grpclb_request_destroy(request); |
| 997 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 998 | glb_policy->lb_call_status_details = NULL; |
| 999 | glb_policy->lb_call_status_details_capacity = 0; |
| 1000 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1001 | grpc_closure_init(&glb_policy->lb_on_server_status_received, |
| 1002 | lb_on_server_status_received, glb_policy); |
| 1003 | grpc_closure_init(&glb_policy->lb_on_response_received, |
| 1004 | lb_on_response_received, glb_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1005 | |
| 1006 | gpr_backoff_init(&glb_policy->lb_call_backoff_state, BACKOFF_MULTIPLIER, |
| 1007 | BACKOFF_JITTER, BACKOFF_MIN_SECONDS * 1000, |
| 1008 | BACKOFF_MAX_SECONDS * 1000); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1009 | } |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1010 | |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 1011 | static void lb_call_destroy_locked(glb_lb_policy *glb_policy) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1012 | GPR_ASSERT(glb_policy->lb_call != NULL); |
| 1013 | grpc_call_destroy(glb_policy->lb_call); |
| 1014 | glb_policy->lb_call = NULL; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1015 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1016 | grpc_metadata_array_destroy(&glb_policy->lb_initial_metadata_recv); |
| 1017 | grpc_metadata_array_destroy(&glb_policy->lb_trailing_metadata_recv); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1018 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1019 | grpc_byte_buffer_destroy(glb_policy->lb_request_payload); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1020 | gpr_free(glb_policy->lb_call_status_details); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1021 | } |
| 1022 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1023 | /* |
| 1024 | * Auxiliary functions and LB client callbacks. |
| 1025 | */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1026 | static void query_for_backends_locked(grpc_exec_ctx *exec_ctx, |
| 1027 | glb_lb_policy *glb_policy) { |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1028 | GPR_ASSERT(glb_policy->lb_channel != NULL); |
David Garcia Quintas | a74b246 | 2016-11-11 14:07:27 -0800 | [diff] [blame] | 1029 | if (glb_policy->shutting_down) return; |
| 1030 | |
| 1031 | lb_call_init_locked(glb_policy); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1032 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1033 | if (grpc_lb_glb_trace) { |
| 1034 | gpr_log(GPR_INFO, "Query for backends (grpclb: %p, lb_call: %p)", |
| 1035 | (void *)glb_policy, (void *)glb_policy->lb_call); |
| 1036 | } |
| 1037 | GPR_ASSERT(glb_policy->lb_call != NULL); |
| 1038 | |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1039 | grpc_call_error call_error; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1040 | grpc_op ops[4]; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1041 | memset(ops, 0, sizeof(ops)); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1042 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1043 | grpc_op *op = ops; |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1044 | op->op = GRPC_OP_SEND_INITIAL_METADATA; |
| 1045 | op->data.send_initial_metadata.count = 0; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1046 | op->flags = 0; |
| 1047 | op->reserved = NULL; |
| 1048 | op++; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1049 | |
| 1050 | op->op = GRPC_OP_RECV_INITIAL_METADATA; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1051 | op->data.recv_initial_metadata = &glb_policy->lb_initial_metadata_recv; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1052 | op->flags = 0; |
| 1053 | op->reserved = NULL; |
| 1054 | op++; |
| 1055 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1056 | GPR_ASSERT(glb_policy->lb_request_payload != NULL); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1057 | op->op = GRPC_OP_SEND_MESSAGE; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1058 | op->data.send_message = glb_policy->lb_request_payload; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1059 | op->flags = 0; |
| 1060 | op->reserved = NULL; |
| 1061 | op++; |
| 1062 | |
| 1063 | op->op = GRPC_OP_RECV_STATUS_ON_CLIENT; |
| 1064 | op->data.recv_status_on_client.trailing_metadata = |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1065 | &glb_policy->lb_trailing_metadata_recv; |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1066 | op->data.recv_status_on_client.status = &glb_policy->lb_call_status; |
| 1067 | op->data.recv_status_on_client.status_details = |
| 1068 | &glb_policy->lb_call_status_details; |
| 1069 | op->data.recv_status_on_client.status_details_capacity = |
| 1070 | &glb_policy->lb_call_status_details_capacity; |
| 1071 | op->flags = 0; |
| 1072 | op->reserved = NULL; |
| 1073 | op++; |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1074 | /* take a weak ref (won't prevent calling of \a glb_shutdown if the strong ref |
| 1075 | * count goes to zero) to be unref'd in lb_on_server_status_received */ |
| 1076 | 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] | 1077 | call_error = grpc_call_start_batch_and_execute( |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1078 | exec_ctx, glb_policy->lb_call, ops, (size_t)(op - ops), |
| 1079 | &glb_policy->lb_on_server_status_received); |
David Garcia Quintas | 6531826 | 2016-07-29 13:43:38 -0700 | [diff] [blame] | 1080 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
| 1081 | |
| 1082 | op = ops; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1083 | op->op = GRPC_OP_RECV_MESSAGE; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1084 | op->data.recv_message = &glb_policy->lb_response_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1085 | op->flags = 0; |
| 1086 | op->reserved = NULL; |
| 1087 | op++; |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1088 | /* take another weak ref to be unref'd in lb_on_response_received */ |
| 1089 | 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] | 1090 | call_error = grpc_call_start_batch_and_execute( |
| 1091 | exec_ctx, glb_policy->lb_call, ops, (size_t)(op - ops), |
| 1092 | &glb_policy->lb_on_response_received); |
David Garcia Quintas | 280fd2a | 2016-06-20 22:04:48 -0700 | [diff] [blame] | 1093 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1094 | } |
| 1095 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1096 | static void lb_on_response_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 1097 | grpc_error *error) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1098 | glb_lb_policy *glb_policy = arg; |
| 1099 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1100 | grpc_op ops[2]; |
| 1101 | memset(ops, 0, sizeof(ops)); |
| 1102 | grpc_op *op = ops; |
David Garcia Quintas | f953295 | 2016-11-08 14:14:25 -0800 | [diff] [blame] | 1103 | gpr_mu_lock(&glb_policy->mu); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1104 | if (glb_policy->lb_response_payload != NULL) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1105 | gpr_backoff_reset(&glb_policy->lb_call_backoff_state); |
David Garcia Quintas | 41bef45 | 2016-07-28 19:19:58 -0700 | [diff] [blame] | 1106 | /* Received data from the LB server. Look inside |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1107 | * glb_policy->lb_response_payload, for a serverlist. */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1108 | grpc_byte_buffer_reader bbr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1109 | grpc_byte_buffer_reader_init(&bbr, glb_policy->lb_response_payload); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 1110 | grpc_slice response_slice = grpc_byte_buffer_reader_readall(&bbr); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1111 | grpc_byte_buffer_destroy(glb_policy->lb_response_payload); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1112 | grpc_grpclb_serverlist *serverlist = |
| 1113 | grpc_grpclb_response_parse_serverlist(response_slice); |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1114 | if (serverlist != NULL) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1115 | GPR_ASSERT(glb_policy->lb_call != NULL); |
Craig Tiller | d41a4a7 | 2016-10-26 16:16:06 -0700 | [diff] [blame] | 1116 | grpc_slice_unref(response_slice); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1117 | if (grpc_lb_glb_trace) { |
Jan Tattermusch | 2b39808 | 2016-10-07 14:40:30 +0200 | [diff] [blame] | 1118 | gpr_log(GPR_INFO, "Serverlist with %lu servers received", |
| 1119 | (unsigned long)serverlist->num_servers); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1120 | for (size_t i = 0; i < serverlist->num_servers; ++i) { |
| 1121 | grpc_resolved_address addr; |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1122 | parse_server(serverlist->servers[i], &addr); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1123 | char *ipport; |
| 1124 | grpc_sockaddr_to_string(&ipport, &addr, false); |
| 1125 | gpr_log(GPR_INFO, "Serverlist[%lu]: %s", (unsigned long)i, ipport); |
| 1126 | gpr_free(ipport); |
| 1127 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1128 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1129 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1130 | /* update serverlist */ |
| 1131 | if (serverlist->num_servers > 0) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1132 | if (grpc_grpclb_serverlist_equals(glb_policy->serverlist, serverlist)) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1133 | if (grpc_lb_glb_trace) { |
| 1134 | gpr_log(GPR_INFO, |
| 1135 | "Incoming server list identical to current, ignoring."); |
| 1136 | } |
| 1137 | } else { /* new serverlist */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1138 | if (glb_policy->serverlist != NULL) { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1139 | /* dispose of the old serverlist */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1140 | grpc_grpclb_destroy_serverlist(glb_policy->serverlist); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1141 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1142 | /* and update the copy in the glb_lb_policy instance */ |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1143 | glb_policy->serverlist = serverlist; |
| 1144 | |
| 1145 | rr_handover_locked(exec_ctx, glb_policy, error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1146 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1147 | } else { |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1148 | if (grpc_lb_glb_trace) { |
| 1149 | gpr_log(GPR_INFO, |
| 1150 | "Received empty server list. Picks will stay pending until a " |
| 1151 | "response with > 0 servers is received"); |
| 1152 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1153 | } |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1154 | } else { /* serverlist == NULL */ |
| 1155 | gpr_log(GPR_ERROR, "Invalid LB response received: '%s'. Ignoring.", |
Craig Tiller | 32df467 | 2016-11-04 08:21:56 -0700 | [diff] [blame] | 1156 | grpc_dump_slice(response_slice, GPR_DUMP_ASCII | GPR_DUMP_HEX)); |
| 1157 | grpc_slice_unref(response_slice); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1158 | } |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1159 | |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 1160 | if (!glb_policy->shutting_down) { |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1161 | /* keep listening for serverlist updates */ |
| 1162 | op->op = GRPC_OP_RECV_MESSAGE; |
David Garcia Quintas | 246c564 | 2016-11-01 11:16:52 -0700 | [diff] [blame] | 1163 | op->data.recv_message = &glb_policy->lb_response_payload; |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1164 | op->flags = 0; |
| 1165 | op->reserved = NULL; |
| 1166 | op++; |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1167 | /* reuse the "lb_on_response_received" weak ref taken in |
| 1168 | * query_for_backends_locked() */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1169 | 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] | 1170 | exec_ctx, glb_policy->lb_call, ops, (size_t)(op - ops), |
| 1171 | &glb_policy->lb_on_response_received); /* loop */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1172 | GPR_ASSERT(GRPC_CALL_OK == call_error); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1173 | } |
David Garcia Quintas | f953295 | 2016-11-08 14:14:25 -0800 | [diff] [blame] | 1174 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 1175 | } else { /* empty payload: call cancelled. */ |
murgatroid99 | 2e01234 | 2016-11-10 18:24:08 -0800 | [diff] [blame] | 1176 | /* dispose of the "lb_on_response_received" weak ref taken in |
| 1177 | * query_for_backends_locked() and reused in every reception loop */ |
David Garcia Quintas | d4d2ece | 2016-11-08 14:38:12 -0800 | [diff] [blame] | 1178 | gpr_mu_unlock(&glb_policy->mu); |
| 1179 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
| 1180 | "lb_on_response_received_empty_payload"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1181 | } |
| 1182 | } |
David Garcia Quintas | ea11d16 | 2016-07-14 17:27:28 -0700 | [diff] [blame] | 1183 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1184 | static void lb_call_on_retry_timer(grpc_exec_ctx *exec_ctx, void *arg, |
| 1185 | grpc_error *error) { |
| 1186 | glb_lb_policy *glb_policy = arg; |
| 1187 | gpr_mu_lock(&glb_policy->mu); |
| 1188 | |
| 1189 | if (!glb_policy->shutting_down) { |
| 1190 | if (grpc_lb_glb_trace) { |
| 1191 | gpr_log(GPR_INFO, "Restaring call to LB server (grpclb %p)", |
| 1192 | (void *)glb_policy); |
| 1193 | } |
| 1194 | GPR_ASSERT(glb_policy->lb_call == NULL); |
| 1195 | query_for_backends_locked(exec_ctx, glb_policy); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1196 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1197 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1198 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
| 1199 | "grpclb_on_retry_timer"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1200 | } |
| 1201 | |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1202 | static void lb_on_server_status_received(grpc_exec_ctx *exec_ctx, void *arg, |
| 1203 | grpc_error *error) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1204 | glb_lb_policy *glb_policy = arg; |
| 1205 | gpr_mu_lock(&glb_policy->mu); |
| 1206 | |
| 1207 | GPR_ASSERT(glb_policy->lb_call != NULL); |
| 1208 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1209 | if (grpc_lb_glb_trace) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1210 | gpr_log(GPR_DEBUG, |
| 1211 | "Status from LB server received. Status = %d, Details = '%s', " |
| 1212 | "(call: %p)", |
| 1213 | glb_policy->lb_call_status, glb_policy->lb_call_status_details, |
| 1214 | (void *)glb_policy->lb_call); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1215 | } |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1216 | |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1217 | /* We need to performe cleanups no matter what. */ |
David Garcia Quintas | aa24e9a | 2016-11-07 11:05:50 -0800 | [diff] [blame] | 1218 | lb_call_destroy_locked(glb_policy); |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1219 | |
| 1220 | if (!glb_policy->shutting_down) { |
David Garcia Quintas | 98da61b | 2016-10-29 08:46:31 +0200 | [diff] [blame] | 1221 | /* if we aren't shutting down, restart the LB client call after some time */ |
| 1222 | gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); |
| 1223 | gpr_timespec next_try = |
| 1224 | gpr_backoff_step(&glb_policy->lb_call_backoff_state, now); |
| 1225 | if (grpc_lb_glb_trace) { |
| 1226 | gpr_log(GPR_DEBUG, "Connection to LB server lost (grpclb: %p)...", |
| 1227 | (void *)glb_policy); |
| 1228 | gpr_timespec timeout = gpr_time_sub(next_try, now); |
| 1229 | if (gpr_time_cmp(timeout, gpr_time_0(timeout.clock_type)) > 0) { |
| 1230 | gpr_log(GPR_DEBUG, "... retrying in %" PRId64 ".%09d seconds.", |
| 1231 | timeout.tv_sec, timeout.tv_nsec); |
| 1232 | } else { |
| 1233 | gpr_log(GPR_DEBUG, "... retrying immediately."); |
| 1234 | } |
| 1235 | } |
| 1236 | GRPC_LB_POLICY_WEAK_REF(&glb_policy->base, "grpclb_retry_timer"); |
| 1237 | grpc_timer_init(exec_ctx, &glb_policy->lb_call_retry_timer, next_try, |
| 1238 | lb_call_on_retry_timer, glb_policy, now); |
| 1239 | } |
| 1240 | gpr_mu_unlock(&glb_policy->mu); |
David Garcia Quintas | 7ec2913 | 2016-11-01 04:09:05 +0100 | [diff] [blame] | 1241 | GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, &glb_policy->base, |
| 1242 | "lb_on_server_status_received"); |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
David Garcia Quintas | 8d48911 | 2016-07-29 15:20:42 -0700 | [diff] [blame] | 1245 | /* Code wiring the policy with the rest of the core */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1246 | static const grpc_lb_policy_vtable glb_lb_policy_vtable = { |
| 1247 | glb_destroy, glb_shutdown, glb_pick, |
| 1248 | glb_cancel_pick, glb_cancel_picks, glb_ping_one, |
| 1249 | glb_exit_idle, glb_check_connectivity, glb_notify_on_state_change}; |
| 1250 | |
| 1251 | static void glb_factory_ref(grpc_lb_policy_factory *factory) {} |
| 1252 | |
| 1253 | static void glb_factory_unref(grpc_lb_policy_factory *factory) {} |
| 1254 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1255 | static const grpc_lb_policy_factory_vtable glb_factory_vtable = { |
| 1256 | glb_factory_ref, glb_factory_unref, glb_create, "grpclb"}; |
| 1257 | |
| 1258 | static grpc_lb_policy_factory glb_lb_policy_factory = {&glb_factory_vtable}; |
| 1259 | |
| 1260 | grpc_lb_policy_factory *grpc_glb_lb_factory_create() { |
| 1261 | return &glb_lb_policy_factory; |
| 1262 | } |
| 1263 | |
| 1264 | /* Plugin registration */ |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 1265 | void grpc_lb_policy_grpclb_init() { |
| 1266 | grpc_register_lb_policy(grpc_glb_lb_factory_create()); |
| 1267 | grpc_register_tracer("glb", &grpc_lb_glb_trace); |
| 1268 | } |
| 1269 | |
| 1270 | void grpc_lb_policy_grpclb_shutdown() {} |