Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 6169d5f | 2016-03-31 07:46:18 -0700 | [diff] [blame] | 3 | * Copyright 2015, Google Inc. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 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 | |
Mark D. Roth | 2137cd8 | 2016-09-14 09:04:00 -0700 | [diff] [blame] | 34 | #include "src/core/ext/client_channel/client_channel.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 35 | |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 36 | #include <stdbool.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 37 | #include <stdio.h> |
Craig Tiller | eb3b12e | 2015-06-26 14:42:49 -0700 | [diff] [blame] | 38 | #include <string.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 39 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 40 | #include <grpc/support/alloc.h> |
| 41 | #include <grpc/support/log.h> |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 42 | #include <grpc/support/string_util.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 43 | #include <grpc/support/sync.h> |
| 44 | #include <grpc/support/useful.h> |
| 45 | |
Mark D. Roth | 1519574 | 2016-10-07 09:02:28 -0700 | [diff] [blame] | 46 | #include "src/core/ext/client_channel/lb_policy_registry.h" |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 47 | #include "src/core/ext/client_channel/resolver_registry.h" |
Mark D. Roth | 2137cd8 | 2016-09-14 09:04:00 -0700 | [diff] [blame] | 48 | #include "src/core/ext/client_channel/subchannel.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 49 | #include "src/core/lib/channel/channel_args.h" |
| 50 | #include "src/core/lib/channel/connected_channel.h" |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 51 | #include "src/core/lib/channel/deadline_filter.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 52 | #include "src/core/lib/iomgr/iomgr.h" |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 53 | #include "src/core/lib/iomgr/polling_entity.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 54 | #include "src/core/lib/profiling/timers.h" |
| 55 | #include "src/core/lib/support/string.h" |
| 56 | #include "src/core/lib/surface/channel.h" |
| 57 | #include "src/core/lib/transport/connectivity_state.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 58 | #include "src/core/lib/transport/metadata.h" |
| 59 | #include "src/core/lib/transport/metadata_batch.h" |
Mark D. Roth | bfe5680 | 2016-10-26 12:45:20 -0700 | [diff] [blame] | 60 | #include "src/core/lib/transport/method_config.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 61 | #include "src/core/lib/transport/static_metadata.h" |
Craig Tiller | 8910ac6 | 2015-10-08 16:49:15 -0700 | [diff] [blame] | 62 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 63 | /* Client channel implementation */ |
| 64 | |
Mark D. Roth | 26b7be4 | 2016-10-24 10:08:07 -0700 | [diff] [blame] | 65 | /************************************************************************* |
| 66 | * METHOD-CONFIG TABLE |
| 67 | */ |
| 68 | |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 69 | typedef enum { |
| 70 | WAIT_FOR_READY_UNSET, |
| 71 | WAIT_FOR_READY_FALSE, |
| 72 | WAIT_FOR_READY_TRUE |
| 73 | } wait_for_ready_value; |
| 74 | |
| 75 | typedef struct method_parameters { |
| 76 | gpr_timespec timeout; |
| 77 | wait_for_ready_value wait_for_ready; |
| 78 | } method_parameters; |
| 79 | |
| 80 | static void *method_parameters_copy(void *value) { |
| 81 | void *new_value = gpr_malloc(sizeof(method_parameters)); |
| 82 | memcpy(new_value, value, sizeof(method_parameters)); |
| 83 | return new_value; |
| 84 | } |
| 85 | |
| 86 | static int method_parameters_cmp(void *value1, void *value2) { |
| 87 | const method_parameters *v1 = value1; |
| 88 | const method_parameters *v2 = value2; |
| 89 | const int retval = gpr_time_cmp(v1->timeout, v2->timeout); |
| 90 | if (retval != 0) return retval; |
| 91 | if (v1->wait_for_ready > v2->wait_for_ready) return 1; |
| 92 | if (v1->wait_for_ready < v2->wait_for_ready) return -1; |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static const grpc_mdstr_hash_table_vtable method_parameters_vtable = { |
| 97 | gpr_free, method_parameters_copy, method_parameters_cmp}; |
| 98 | |
| 99 | static void *method_config_convert_value( |
| 100 | const grpc_method_config *method_config) { |
| 101 | method_parameters *value = gpr_malloc(sizeof(method_parameters)); |
| 102 | const gpr_timespec *timeout = grpc_method_config_get_timeout(method_config); |
| 103 | value->timeout = timeout != NULL ? *timeout : gpr_time_0(GPR_TIMESPAN); |
| 104 | const bool *wait_for_ready = |
| 105 | grpc_method_config_get_wait_for_ready(method_config); |
| 106 | value->wait_for_ready = |
| 107 | wait_for_ready == NULL |
| 108 | ? WAIT_FOR_READY_UNSET |
| 109 | : (wait_for_ready ? WAIT_FOR_READY_TRUE : WAIT_FOR_READY_FALSE); |
| 110 | return value; |
| 111 | } |
| 112 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 113 | /************************************************************************* |
| 114 | * CHANNEL-WIDE FUNCTIONS |
| 115 | */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 116 | |
Craig Tiller | 800dacb | 2015-10-06 09:10:26 -0700 | [diff] [blame] | 117 | typedef struct client_channel_channel_data { |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 118 | /** resolver for this channel */ |
| 119 | grpc_resolver *resolver; |
Craig Tiller | 20a3c35 | 2015-08-05 08:39:50 -0700 | [diff] [blame] | 120 | /** have we started resolving this channel */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 121 | bool started_resolving; |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 122 | /** client channel factory */ |
| 123 | grpc_client_channel_factory *client_channel_factory; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 124 | |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 125 | /** mutex protecting all variables below in this data structure */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 126 | gpr_mu mu; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 127 | /** currently active load balancer */ |
Mark D. Roth | 78afd77 | 2016-11-04 12:49:49 -0700 | [diff] [blame] | 128 | char *lb_policy_name; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 129 | grpc_lb_policy *lb_policy; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 130 | /** maps method names to method_parameters structs */ |
| 131 | grpc_mdstr_hash_table *method_params_table; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 132 | /** incoming resolver result - set by resolver.next() */ |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 133 | grpc_channel_args *resolver_result; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 134 | /** a list of closures that are all waiting for config to come in */ |
Craig Tiller | d9ccbbf | 2015-09-22 09:30:00 -0700 | [diff] [blame] | 135 | grpc_closure_list waiting_for_config_closures; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 136 | /** resolver callback */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 137 | grpc_closure on_resolver_result_changed; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 138 | /** connectivity state being tracked */ |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 139 | grpc_connectivity_state_tracker state_tracker; |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 140 | /** when an lb_policy arrives, should we try to exit idle */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 141 | bool exit_idle_when_lb_policy_arrives; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 142 | /** owning stack */ |
| 143 | grpc_channel_stack *owning_stack; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 144 | /** interested parties (owned) */ |
| 145 | grpc_pollset_set *interested_parties; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 146 | } channel_data; |
| 147 | |
Craig Tiller | d6c98df | 2015-08-18 09:33:44 -0700 | [diff] [blame] | 148 | /** We create one watcher for each new lb_policy that is returned from a |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 149 | resolver, to watch for state changes from the lb_policy. When a state |
| 150 | change is seen, we update the channel, and create a new watcher. */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 151 | typedef struct { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 152 | channel_data *chand; |
Craig Tiller | 3382511 | 2015-09-18 07:44:19 -0700 | [diff] [blame] | 153 | grpc_closure on_changed; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 154 | grpc_connectivity_state state; |
| 155 | grpc_lb_policy *lb_policy; |
| 156 | } lb_policy_connectivity_watcher; |
| 157 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 158 | static void watch_lb_policy(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 159 | grpc_lb_policy *lb_policy, |
| 160 | grpc_connectivity_state current_state); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 161 | |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 162 | static void set_channel_connectivity_state_locked(grpc_exec_ctx *exec_ctx, |
| 163 | channel_data *chand, |
| 164 | grpc_connectivity_state state, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 165 | grpc_error *error, |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 166 | const char *reason) { |
| 167 | if ((state == GRPC_CHANNEL_TRANSIENT_FAILURE || |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 168 | state == GRPC_CHANNEL_SHUTDOWN) && |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 169 | chand->lb_policy != NULL) { |
Mark D. Roth | 59c9f90 | 2016-09-28 13:33:21 -0700 | [diff] [blame] | 170 | /* cancel picks with wait_for_ready=false */ |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 171 | grpc_lb_policy_cancel_picks( |
| 172 | exec_ctx, chand->lb_policy, |
Mark D. Roth | 59c9f90 | 2016-09-28 13:33:21 -0700 | [diff] [blame] | 173 | /* mask= */ GRPC_INITIAL_METADATA_WAIT_FOR_READY, |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 174 | /* check= */ 0, GRPC_ERROR_REF(error)); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 175 | } |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 176 | grpc_connectivity_state_set(exec_ctx, &chand->state_tracker, state, error, |
| 177 | reason); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 178 | } |
| 179 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 180 | static void on_lb_policy_state_changed_locked(grpc_exec_ctx *exec_ctx, |
| 181 | lb_policy_connectivity_watcher *w, |
| 182 | grpc_error *error) { |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 183 | grpc_connectivity_state publish_state = w->state; |
Craig Tiller | 5795da7 | 2015-09-17 15:27:13 -0700 | [diff] [blame] | 184 | /* check if the notification is for a stale policy */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 185 | if (w->lb_policy != w->chand->lb_policy) return; |
Craig Tiller | 5795da7 | 2015-09-17 15:27:13 -0700 | [diff] [blame] | 186 | |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 187 | if (publish_state == GRPC_CHANNEL_SHUTDOWN && w->chand->resolver != NULL) { |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 188 | publish_state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
| 189 | grpc_resolver_channel_saw_error(exec_ctx, w->chand->resolver); |
Craig Tiller | f62c4d5 | 2015-12-04 07:43:07 -0800 | [diff] [blame] | 190 | GRPC_LB_POLICY_UNREF(exec_ctx, w->chand->lb_policy, "channel"); |
| 191 | w->chand->lb_policy = NULL; |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 192 | } |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 193 | set_channel_connectivity_state_locked(exec_ctx, w->chand, publish_state, |
Craig Tiller | fc353d6 | 2016-05-10 12:58:03 -0700 | [diff] [blame] | 194 | GRPC_ERROR_REF(error), "lb_changed"); |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 195 | if (w->state != GRPC_CHANNEL_SHUTDOWN) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 196 | watch_lb_policy(exec_ctx, w->chand, w->lb_policy, w->state); |
| 197 | } |
Craig Tiller | 5795da7 | 2015-09-17 15:27:13 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 200 | static void on_lb_policy_state_changed(grpc_exec_ctx *exec_ctx, void *arg, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 201 | grpc_error *error) { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 202 | lb_policy_connectivity_watcher *w = arg; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 203 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 204 | gpr_mu_lock(&w->chand->mu); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 205 | on_lb_policy_state_changed_locked(exec_ctx, w, error); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 206 | gpr_mu_unlock(&w->chand->mu); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 207 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 208 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, "watch_lb_policy"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 209 | gpr_free(w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 210 | } |
| 211 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 212 | static void watch_lb_policy(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 213 | grpc_lb_policy *lb_policy, |
| 214 | grpc_connectivity_state current_state) { |
| 215 | lb_policy_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 216 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "watch_lb_policy"); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 217 | |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 218 | w->chand = chand; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 219 | grpc_closure_init(&w->on_changed, on_lb_policy_state_changed, w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 220 | w->state = current_state; |
| 221 | w->lb_policy = lb_policy; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 222 | grpc_lb_policy_notify_on_state_change(exec_ctx, lb_policy, &w->state, |
| 223 | &w->on_changed); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 224 | } |
| 225 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 226 | static void on_resolver_result_changed(grpc_exec_ctx *exec_ctx, void *arg, |
| 227 | grpc_error *error) { |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 228 | channel_data *chand = arg; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 229 | char *lb_policy_name = NULL; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 230 | grpc_lb_policy *lb_policy = NULL; |
| 231 | grpc_lb_policy *old_lb_policy; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 232 | grpc_mdstr_hash_table *method_params_table = NULL; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 233 | grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 234 | bool exit_idle = false; |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 235 | grpc_error *state_error = GRPC_ERROR_CREATE("No load balancing policy"); |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 236 | |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 237 | if (chand->resolver_result != NULL) { |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 238 | grpc_lb_policy_args lb_policy_args; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 239 | lb_policy_args.args = chand->resolver_result; |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 240 | lb_policy_args.client_channel_factory = chand->client_channel_factory; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 241 | |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 242 | // Find LB policy name. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 243 | const grpc_arg *channel_arg = |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 244 | grpc_channel_args_find(lb_policy_args.args, GRPC_ARG_LB_POLICY_NAME); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 245 | if (channel_arg != NULL) { |
| 246 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
| 247 | lb_policy_name = channel_arg->value.string; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 248 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 249 | // Special case: If all of the addresses are balancer addresses, |
| 250 | // assume that we should use the grpclb policy, regardless of what the |
| 251 | // resolver actually specified. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 252 | channel_arg = |
| 253 | grpc_channel_args_find(lb_policy_args.args, GRPC_ARG_LB_ADDRESSES); |
| 254 | if (channel_arg != NULL) { |
| 255 | GPR_ASSERT(channel_arg->type == GRPC_ARG_POINTER); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 256 | grpc_lb_addresses *addresses = channel_arg->value.pointer.p; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 257 | bool found_backend_address = false; |
| 258 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 259 | if (!addresses->addresses[i].is_balancer) { |
| 260 | found_backend_address = true; |
| 261 | break; |
| 262 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 263 | } |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 264 | if (!found_backend_address) { |
| 265 | if (lb_policy_name != NULL && strcmp(lb_policy_name, "grpclb") != 0) { |
| 266 | gpr_log(GPR_INFO, |
| 267 | "resolver requested LB policy %s but provided only balancer " |
| 268 | "addresses, no backend addresses -- forcing use of grpclb LB " |
| 269 | "policy", |
Mark D. Roth | 5f40e5d | 2016-10-24 13:09:05 -0700 | [diff] [blame] | 270 | lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 271 | } |
| 272 | lb_policy_name = "grpclb"; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 273 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 274 | } |
| 275 | // Use pick_first if nothing was specified and we didn't select grpclb |
| 276 | // above. |
| 277 | if (lb_policy_name == NULL) lb_policy_name = "pick_first"; |
| 278 | |
| 279 | lb_policy = |
| 280 | grpc_lb_policy_create(exec_ctx, lb_policy_name, &lb_policy_args); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 281 | if (lb_policy != NULL) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 282 | GRPC_LB_POLICY_REF(lb_policy, "config_change"); |
Craig Tiller | f707d62 | 2016-05-06 14:26:12 -0700 | [diff] [blame] | 283 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 284 | state = |
| 285 | grpc_lb_policy_check_connectivity(exec_ctx, lb_policy, &state_error); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 286 | } |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 287 | channel_arg = |
| 288 | grpc_channel_args_find(lb_policy_args.args, GRPC_ARG_SERVICE_CONFIG); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 289 | if (channel_arg != NULL) { |
| 290 | GPR_ASSERT(channel_arg->type == GRPC_ARG_POINTER); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 291 | method_params_table = grpc_method_config_table_convert( |
| 292 | (grpc_method_config_table *)channel_arg->value.pointer.p, |
| 293 | method_config_convert_value, &method_parameters_vtable); |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 294 | } |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 295 | // Before we clean up, save a copy of lb_policy_name, since it might |
| 296 | // be pointing to data inside chand->resolver_result. |
| 297 | // The copy will be saved in chand->lb_policy_name below. |
| 298 | lb_policy_name = gpr_strdup(lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 299 | grpc_channel_args_destroy(chand->resolver_result); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 300 | chand->resolver_result = NULL; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 301 | } |
| 302 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 303 | if (lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 304 | grpc_pollset_set_add_pollset_set(exec_ctx, lb_policy->interested_parties, |
| 305 | chand->interested_parties); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 306 | } |
| 307 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 308 | gpr_mu_lock(&chand->mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 309 | if (lb_policy_name != NULL) { |
| 310 | gpr_free(chand->lb_policy_name); |
| 311 | chand->lb_policy_name = lb_policy_name; |
| 312 | } |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 313 | old_lb_policy = chand->lb_policy; |
| 314 | chand->lb_policy = lb_policy; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 315 | if (chand->method_params_table != NULL) { |
| 316 | grpc_mdstr_hash_table_unref(chand->method_params_table); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 317 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 318 | chand->method_params_table = method_params_table; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 319 | if (lb_policy != NULL) { |
| 320 | grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures, |
| 321 | NULL); |
| 322 | } else if (chand->resolver == NULL /* disconnected */) { |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 323 | grpc_closure_list_fail_all( |
| 324 | &chand->waiting_for_config_closures, |
| 325 | GRPC_ERROR_CREATE_REFERENCING("Channel disconnected", &error, 1)); |
Craig Tiller | 6c39686 | 2016-01-28 13:53:40 -0800 | [diff] [blame] | 326 | grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures, |
| 327 | NULL); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 328 | } |
| 329 | if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) { |
| 330 | GRPC_LB_POLICY_REF(lb_policy, "exit_idle"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 331 | exit_idle = true; |
| 332 | chand->exit_idle_when_lb_policy_arrives = false; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 333 | } |
Craig Tiller | 9846503 | 2015-06-29 14:36:42 -0700 | [diff] [blame] | 334 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 335 | if (error == GRPC_ERROR_NONE && chand->resolver) { |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 336 | set_channel_connectivity_state_locked( |
| 337 | exec_ctx, chand, state, GRPC_ERROR_REF(state_error), "new_lb+resolver"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 338 | if (lb_policy != NULL) { |
| 339 | watch_lb_policy(exec_ctx, chand, lb_policy, state); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 340 | } |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 341 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 342 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 343 | &chand->on_resolver_result_changed); |
| 344 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 345 | } else { |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 346 | if (chand->resolver != NULL) { |
| 347 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 348 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 349 | chand->resolver = NULL; |
| 350 | } |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 351 | grpc_error *refs[] = {error, state_error}; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 352 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 353 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 354 | GRPC_ERROR_CREATE_REFERENCING("Got config after disconnection", refs, |
| 355 | GPR_ARRAY_SIZE(refs)), |
| 356 | "resolver_gone"); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 357 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 358 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 359 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 360 | if (exit_idle) { |
| 361 | grpc_lb_policy_exit_idle(exec_ctx, lb_policy); |
| 362 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "exit_idle"); |
| 363 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 364 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 365 | if (old_lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 366 | grpc_pollset_set_del_pollset_set( |
| 367 | exec_ctx, old_lb_policy->interested_parties, chand->interested_parties); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 368 | GRPC_LB_POLICY_UNREF(exec_ctx, old_lb_policy, "channel"); |
| 369 | } |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 370 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 371 | if (lb_policy != NULL) { |
| 372 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "config_change"); |
| 373 | } |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 374 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 375 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver"); |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 376 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 379 | static void cc_start_transport_op(grpc_exec_ctx *exec_ctx, |
| 380 | grpc_channel_element *elem, |
| 381 | grpc_transport_op *op) { |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 382 | channel_data *chand = elem->channel_data; |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 383 | |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 384 | grpc_exec_ctx_sched(exec_ctx, op->on_consumed, GRPC_ERROR_NONE, NULL); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 385 | |
Craig Tiller | d7f12e3 | 2016-03-03 10:08:31 -0800 | [diff] [blame] | 386 | GPR_ASSERT(op->set_accept_stream == false); |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 387 | if (op->bind_pollset != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 388 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, |
Craig Tiller | e2c6237 | 2015-12-07 16:11:03 -0800 | [diff] [blame] | 389 | op->bind_pollset); |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 390 | } |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 391 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 392 | gpr_mu_lock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 393 | if (op->on_connectivity_state_change != NULL) { |
| 394 | grpc_connectivity_state_notify_on_state_change( |
| 395 | exec_ctx, &chand->state_tracker, op->connectivity_state, |
| 396 | op->on_connectivity_state_change); |
| 397 | op->on_connectivity_state_change = NULL; |
| 398 | op->connectivity_state = NULL; |
| 399 | } |
| 400 | |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 401 | if (op->send_ping != NULL) { |
Craig Tiller | 87b71e2 | 2015-12-07 15:14:14 -0800 | [diff] [blame] | 402 | if (chand->lb_policy == NULL) { |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 403 | grpc_exec_ctx_sched(exec_ctx, op->send_ping, |
| 404 | GRPC_ERROR_CREATE("Ping with no load balancing"), |
| 405 | NULL); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 406 | } else { |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 407 | grpc_lb_policy_ping_one(exec_ctx, chand->lb_policy, op->send_ping); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 408 | op->bind_pollset = NULL; |
| 409 | } |
| 410 | op->send_ping = NULL; |
| 411 | } |
| 412 | |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 413 | if (op->disconnect_with_error != GRPC_ERROR_NONE) { |
| 414 | if (chand->resolver != NULL) { |
| 415 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 416 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 417 | GRPC_ERROR_REF(op->disconnect_with_error), "disconnect"); |
| 418 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 419 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 420 | chand->resolver = NULL; |
| 421 | if (!chand->started_resolving) { |
| 422 | grpc_closure_list_fail_all(&chand->waiting_for_config_closures, |
| 423 | GRPC_ERROR_REF(op->disconnect_with_error)); |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 424 | grpc_exec_ctx_enqueue_list(exec_ctx, |
| 425 | &chand->waiting_for_config_closures, NULL); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 426 | } |
| 427 | if (chand->lb_policy != NULL) { |
| 428 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 429 | chand->lb_policy->interested_parties, |
| 430 | chand->interested_parties); |
| 431 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 432 | chand->lb_policy = NULL; |
| 433 | } |
Craig Tiller | b12d22a | 2016-04-23 12:50:21 -0700 | [diff] [blame] | 434 | } |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 435 | GRPC_ERROR_UNREF(op->disconnect_with_error); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 436 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 437 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 438 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 439 | |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 440 | static void cc_get_channel_info(grpc_exec_ctx *exec_ctx, |
| 441 | grpc_channel_element *elem, |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 442 | const grpc_channel_info *info) { |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 443 | channel_data *chand = elem->channel_data; |
| 444 | gpr_mu_lock(&chand->mu); |
| 445 | if (info->lb_policy_name != NULL) { |
| 446 | *info->lb_policy_name = chand->lb_policy_name == NULL |
Mark D. Roth | 78afd77 | 2016-11-04 12:49:49 -0700 | [diff] [blame] | 447 | ? NULL |
| 448 | : gpr_strdup(chand->lb_policy_name); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 449 | } |
| 450 | gpr_mu_unlock(&chand->mu); |
| 451 | } |
| 452 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 453 | /* Constructor for channel_data */ |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame^] | 454 | static grpc_error* cc_init_channel_elem(grpc_exec_ctx *exec_ctx, |
| 455 | grpc_channel_element *elem, |
| 456 | grpc_channel_element_args *args) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 457 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 458 | memset(chand, 0, sizeof(*chand)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 459 | GPR_ASSERT(args->is_last); |
| 460 | GPR_ASSERT(elem->filter == &grpc_client_channel_filter); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 461 | // Initialize data members. |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 462 | gpr_mu_init(&chand->mu); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 463 | chand->owning_stack = args->channel_stack; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 464 | grpc_closure_init(&chand->on_resolver_result_changed, |
| 465 | on_resolver_result_changed, chand); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 466 | chand->interested_parties = grpc_pollset_set_create(); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 467 | grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE, |
| 468 | "client_channel"); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 469 | // Record client channel factory. |
| 470 | const grpc_arg *arg = grpc_channel_args_find(args->channel_args, |
| 471 | GRPC_ARG_CLIENT_CHANNEL_FACTORY); |
| 472 | GPR_ASSERT(arg != NULL); |
| 473 | GPR_ASSERT(arg->type == GRPC_ARG_POINTER); |
| 474 | grpc_client_channel_factory_ref(arg->value.pointer.p); |
| 475 | chand->client_channel_factory = arg->value.pointer.p; |
| 476 | // Instantiate resolver. |
Mark D. Roth | 86e9059 | 2016-11-18 09:56:40 -0800 | [diff] [blame] | 477 | arg = grpc_channel_args_find(args->channel_args, GRPC_ARG_SERVER_URI); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 478 | GPR_ASSERT(arg != NULL); |
| 479 | GPR_ASSERT(arg->type == GRPC_ARG_STRING); |
| 480 | chand->resolver = grpc_resolver_create(arg->value.string, args->channel_args); |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame^] | 481 | if (chand->resolver == NULL) { |
| 482 | return GRPC_ERROR_CREATE("resolver creation failed"); |
| 483 | } |
| 484 | return GRPC_ERROR_NONE; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | /* Destructor for channel_data */ |
| 488 | static void cc_destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| 489 | grpc_channel_element *elem) { |
| 490 | channel_data *chand = elem->channel_data; |
| 491 | |
| 492 | if (chand->resolver != NULL) { |
| 493 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 494 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 495 | } |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 496 | if (chand->client_channel_factory != NULL) { |
| 497 | grpc_client_channel_factory_unref(exec_ctx, chand->client_channel_factory); |
| 498 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 499 | if (chand->lb_policy != NULL) { |
| 500 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 501 | chand->lb_policy->interested_parties, |
| 502 | chand->interested_parties); |
| 503 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 504 | } |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 505 | gpr_free(chand->lb_policy_name); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 506 | if (chand->method_params_table != NULL) { |
| 507 | grpc_mdstr_hash_table_unref(chand->method_params_table); |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 508 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 509 | grpc_connectivity_state_destroy(exec_ctx, &chand->state_tracker); |
| 510 | grpc_pollset_set_destroy(chand->interested_parties); |
| 511 | gpr_mu_destroy(&chand->mu); |
| 512 | } |
| 513 | |
| 514 | /************************************************************************* |
| 515 | * PER-CALL FUNCTIONS |
| 516 | */ |
| 517 | |
| 518 | #define GET_CALL(call_data) \ |
| 519 | ((grpc_subchannel_call *)(gpr_atm_acq_load(&(call_data)->subchannel_call))) |
| 520 | |
| 521 | #define CANCELLED_CALL ((grpc_subchannel_call *)1) |
| 522 | |
| 523 | typedef enum { |
| 524 | GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING, |
| 525 | GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL |
| 526 | } subchannel_creation_phase; |
| 527 | |
| 528 | /** Call data. Holds a pointer to grpc_subchannel_call and the |
| 529 | associated machinery to create such a pointer. |
| 530 | Handles queueing of stream ops until a call object is ready, waiting |
| 531 | for initial metadata before trying to create a call object, |
| 532 | and handling cancellation gracefully. */ |
| 533 | typedef struct client_channel_call_data { |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 534 | // State for handling deadlines. |
| 535 | // The code in deadline_filter.c requires this to be the first field. |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 536 | // TODO(roth): This is slightly sub-optimal in that grpc_deadline_state |
| 537 | // and this struct both independently store a pointer to the call |
| 538 | // stack and each has its own mutex. If/when we have time, find a way |
Mark D. Roth | 6ad9917 | 2016-09-09 07:52:48 -0700 | [diff] [blame] | 539 | // to avoid this without breaking the grpc_deadline_state abstraction. |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 540 | grpc_deadline_state deadline_state; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 541 | |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 542 | grpc_mdstr *path; // Request path. |
| 543 | gpr_timespec call_start_time; |
| 544 | gpr_timespec deadline; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 545 | wait_for_ready_value wait_for_ready_from_service_config; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 546 | grpc_closure read_service_config; |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 547 | |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 548 | grpc_error *cancel_error; |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 549 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 550 | /** either 0 for no call, 1 for cancelled, or a pointer to a |
| 551 | grpc_subchannel_call */ |
| 552 | gpr_atm subchannel_call; |
| 553 | |
| 554 | gpr_mu mu; |
| 555 | |
| 556 | subchannel_creation_phase creation_phase; |
| 557 | grpc_connected_subchannel *connected_subchannel; |
| 558 | grpc_polling_entity *pollent; |
| 559 | |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 560 | grpc_transport_stream_op **waiting_ops; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 561 | size_t waiting_ops_count; |
| 562 | size_t waiting_ops_capacity; |
| 563 | |
| 564 | grpc_closure next_step; |
| 565 | |
| 566 | grpc_call_stack *owning_call; |
David Garcia Quintas | d1a47f1 | 2016-09-02 12:46:44 +0200 | [diff] [blame] | 567 | |
| 568 | grpc_linked_mdelem lb_token_mdelem; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 569 | } call_data; |
| 570 | |
| 571 | static void add_waiting_locked(call_data *calld, grpc_transport_stream_op *op) { |
| 572 | GPR_TIMER_BEGIN("add_waiting_locked", 0); |
| 573 | if (calld->waiting_ops_count == calld->waiting_ops_capacity) { |
| 574 | calld->waiting_ops_capacity = GPR_MAX(3, 2 * calld->waiting_ops_capacity); |
| 575 | calld->waiting_ops = |
| 576 | gpr_realloc(calld->waiting_ops, |
| 577 | calld->waiting_ops_capacity * sizeof(*calld->waiting_ops)); |
| 578 | } |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 579 | calld->waiting_ops[calld->waiting_ops_count++] = op; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 580 | GPR_TIMER_END("add_waiting_locked", 0); |
| 581 | } |
| 582 | |
| 583 | static void fail_locked(grpc_exec_ctx *exec_ctx, call_data *calld, |
| 584 | grpc_error *error) { |
| 585 | size_t i; |
| 586 | for (i = 0; i < calld->waiting_ops_count; i++) { |
| 587 | grpc_transport_stream_op_finish_with_failure( |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 588 | exec_ctx, calld->waiting_ops[i], GRPC_ERROR_REF(error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 589 | } |
| 590 | calld->waiting_ops_count = 0; |
| 591 | GRPC_ERROR_UNREF(error); |
| 592 | } |
| 593 | |
| 594 | typedef struct { |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 595 | grpc_transport_stream_op **ops; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 596 | size_t nops; |
| 597 | grpc_subchannel_call *call; |
| 598 | } retry_ops_args; |
| 599 | |
| 600 | static void retry_ops(grpc_exec_ctx *exec_ctx, void *args, grpc_error *error) { |
| 601 | retry_ops_args *a = args; |
| 602 | size_t i; |
| 603 | for (i = 0; i < a->nops; i++) { |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 604 | grpc_subchannel_call_process_op(exec_ctx, a->call, a->ops[i]); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 605 | } |
| 606 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, a->call, "retry_ops"); |
| 607 | gpr_free(a->ops); |
| 608 | gpr_free(a); |
| 609 | } |
| 610 | |
| 611 | static void retry_waiting_locked(grpc_exec_ctx *exec_ctx, call_data *calld) { |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 612 | if (calld->waiting_ops_count == 0) { |
| 613 | return; |
| 614 | } |
| 615 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 616 | retry_ops_args *a = gpr_malloc(sizeof(*a)); |
| 617 | a->ops = calld->waiting_ops; |
| 618 | a->nops = calld->waiting_ops_count; |
| 619 | a->call = GET_CALL(calld); |
| 620 | if (a->call == CANCELLED_CALL) { |
| 621 | gpr_free(a); |
| 622 | fail_locked(exec_ctx, calld, GRPC_ERROR_CANCELLED); |
| 623 | return; |
| 624 | } |
| 625 | calld->waiting_ops = NULL; |
| 626 | calld->waiting_ops_count = 0; |
| 627 | calld->waiting_ops_capacity = 0; |
| 628 | GRPC_SUBCHANNEL_CALL_REF(a->call, "retry_ops"); |
| 629 | grpc_exec_ctx_sched(exec_ctx, grpc_closure_create(retry_ops, a), |
| 630 | GRPC_ERROR_NONE, NULL); |
| 631 | } |
| 632 | |
| 633 | static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *arg, |
| 634 | grpc_error *error) { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 635 | grpc_call_element *elem = arg; |
| 636 | call_data *calld = elem->call_data; |
| 637 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 638 | gpr_mu_lock(&calld->mu); |
| 639 | GPR_ASSERT(calld->creation_phase == |
| 640 | GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL); |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 641 | grpc_polling_entity_del_from_pollset_set(exec_ctx, calld->pollent, |
| 642 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 643 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 644 | if (calld->connected_subchannel == NULL) { |
| 645 | gpr_atm_no_barrier_store(&calld->subchannel_call, 1); |
| 646 | fail_locked(exec_ctx, calld, GRPC_ERROR_CREATE_REFERENCING( |
| 647 | "Failed to create subchannel", &error, 1)); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 648 | } else if (GET_CALL(calld) == CANCELLED_CALL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 649 | /* already cancelled before subchannel became ready */ |
| 650 | fail_locked(exec_ctx, calld, |
| 651 | GRPC_ERROR_CREATE_REFERENCING( |
| 652 | "Cancelled before creating subchannel", &error, 1)); |
| 653 | } else { |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 654 | /* Create call on subchannel. */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 655 | grpc_subchannel_call *subchannel_call = NULL; |
| 656 | grpc_error *new_error = grpc_connected_subchannel_create_call( |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 657 | exec_ctx, calld->connected_subchannel, calld->pollent, calld->path, |
Mark D. Roth | 3d88341 | 2016-11-07 13:42:54 -0800 | [diff] [blame] | 658 | calld->call_start_time, calld->deadline, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 659 | if (new_error != GRPC_ERROR_NONE) { |
| 660 | new_error = grpc_error_add_child(new_error, error); |
| 661 | subchannel_call = CANCELLED_CALL; |
| 662 | fail_locked(exec_ctx, calld, new_error); |
| 663 | } |
| 664 | gpr_atm_rel_store(&calld->subchannel_call, |
| 665 | (gpr_atm)(uintptr_t)subchannel_call); |
| 666 | retry_waiting_locked(exec_ctx, calld); |
| 667 | } |
| 668 | gpr_mu_unlock(&calld->mu); |
| 669 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
| 670 | } |
| 671 | |
| 672 | static char *cc_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) { |
| 673 | call_data *calld = elem->call_data; |
| 674 | grpc_subchannel_call *subchannel_call = GET_CALL(calld); |
| 675 | if (subchannel_call == NULL || subchannel_call == CANCELLED_CALL) { |
| 676 | return NULL; |
| 677 | } else { |
| 678 | return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call); |
| 679 | } |
| 680 | } |
| 681 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 682 | typedef struct { |
| 683 | grpc_metadata_batch *initial_metadata; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 684 | uint32_t initial_metadata_flags; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 685 | grpc_connected_subchannel **connected_subchannel; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 686 | grpc_closure *on_ready; |
| 687 | grpc_call_element *elem; |
| 688 | grpc_closure closure; |
| 689 | } continue_picking_args; |
| 690 | |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 691 | /** Return true if subchannel is available immediately (in which case on_ready |
| 692 | should not be called), or false otherwise (in which case on_ready should be |
| 693 | called when the subchannel is available). */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 694 | static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 695 | grpc_metadata_batch *initial_metadata, |
| 696 | uint32_t initial_metadata_flags, |
| 697 | grpc_connected_subchannel **connected_subchannel, |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 698 | grpc_closure *on_ready, grpc_error *error); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 699 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 700 | static void continue_picking(grpc_exec_ctx *exec_ctx, void *arg, |
| 701 | grpc_error *error) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 702 | continue_picking_args *cpa = arg; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 703 | if (cpa->connected_subchannel == NULL) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 704 | /* cancelled, do nothing */ |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 705 | } else if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 706 | grpc_exec_ctx_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_REF(error), NULL); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 707 | } else { |
| 708 | call_data *calld = cpa->elem->call_data; |
| 709 | gpr_mu_lock(&calld->mu); |
| 710 | if (pick_subchannel(exec_ctx, cpa->elem, cpa->initial_metadata, |
Mark D. Roth | fd2ddd2 | 2016-10-07 10:11:10 -0700 | [diff] [blame] | 711 | cpa->initial_metadata_flags, cpa->connected_subchannel, |
| 712 | cpa->on_ready, GRPC_ERROR_NONE)) { |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 713 | grpc_exec_ctx_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_NONE, NULL); |
| 714 | } |
| 715 | gpr_mu_unlock(&calld->mu); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 716 | } |
| 717 | gpr_free(cpa); |
| 718 | } |
| 719 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 720 | static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 721 | grpc_metadata_batch *initial_metadata, |
| 722 | uint32_t initial_metadata_flags, |
| 723 | grpc_connected_subchannel **connected_subchannel, |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 724 | grpc_closure *on_ready, grpc_error *error) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 725 | GPR_TIMER_BEGIN("pick_subchannel", 0); |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 726 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 727 | channel_data *chand = elem->channel_data; |
| 728 | call_data *calld = elem->call_data; |
| 729 | continue_picking_args *cpa; |
| 730 | grpc_closure *closure; |
| 731 | |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 732 | GPR_ASSERT(connected_subchannel); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 733 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 734 | gpr_mu_lock(&chand->mu); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 735 | if (initial_metadata == NULL) { |
| 736 | if (chand->lb_policy != NULL) { |
Craig Tiller | ab33b48 | 2015-11-21 08:11:04 -0800 | [diff] [blame] | 737 | grpc_lb_policy_cancel_pick(exec_ctx, chand->lb_policy, |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 738 | connected_subchannel, GRPC_ERROR_REF(error)); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 739 | } |
| 740 | for (closure = chand->waiting_for_config_closures.head; closure != NULL; |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 741 | closure = closure->next_data.next) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 742 | cpa = closure->cb_arg; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 743 | if (cpa->connected_subchannel == connected_subchannel) { |
| 744 | cpa->connected_subchannel = NULL; |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 745 | grpc_exec_ctx_sched( |
| 746 | exec_ctx, cpa->on_ready, |
| 747 | GRPC_ERROR_CREATE_REFERENCING("Pick cancelled", &error, 1), NULL); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 748 | } |
| 749 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 750 | gpr_mu_unlock(&chand->mu); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 751 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 697a1f6 | 2016-09-07 13:35:07 -0700 | [diff] [blame] | 752 | GRPC_ERROR_UNREF(error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 753 | return true; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 754 | } |
Mark D. Roth | 697a1f6 | 2016-09-07 13:35:07 -0700 | [diff] [blame] | 755 | GPR_ASSERT(error == GRPC_ERROR_NONE); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 756 | if (chand->lb_policy != NULL) { |
Craig Tiller | 86c0f8a | 2015-12-01 20:05:40 -0800 | [diff] [blame] | 757 | grpc_lb_policy *lb_policy = chand->lb_policy; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 758 | GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel"); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 759 | gpr_mu_unlock(&chand->mu); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 760 | // If the application explicitly set wait_for_ready, use that. |
| 761 | // Otherwise, if the service config specified a value for this |
| 762 | // method, use that. |
Mark D. Roth | c1c3858 | 2016-10-11 11:03:27 -0700 | [diff] [blame] | 763 | const bool wait_for_ready_set_from_api = |
| 764 | initial_metadata_flags & |
| 765 | GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET; |
| 766 | const bool wait_for_ready_set_from_service_config = |
| 767 | calld->wait_for_ready_from_service_config != WAIT_FOR_READY_UNSET; |
| 768 | if (!wait_for_ready_set_from_api && |
| 769 | wait_for_ready_set_from_service_config) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 770 | if (calld->wait_for_ready_from_service_config == WAIT_FOR_READY_TRUE) { |
| 771 | initial_metadata_flags |= GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 772 | } else { |
| 773 | initial_metadata_flags &= ~GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 774 | } |
| 775 | } |
David Garcia Quintas | 61c5801 | 2016-10-03 14:44:20 -0700 | [diff] [blame] | 776 | // TODO(dgq): make this deadline configurable somehow. |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 777 | const grpc_lb_policy_pick_args inputs = { |
Yuchen Zeng | ac8bc42 | 2016-10-05 14:00:02 -0700 | [diff] [blame] | 778 | initial_metadata, initial_metadata_flags, &calld->lb_token_mdelem, |
| 779 | gpr_inf_future(GPR_CLOCK_MONOTONIC)}; |
Mark D. Roth | 55f25b6 | 2016-10-12 14:55:20 -0700 | [diff] [blame] | 780 | const bool result = grpc_lb_policy_pick( |
| 781 | exec_ctx, lb_policy, &inputs, connected_subchannel, NULL, on_ready); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 782 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "pick_subchannel"); |
| 783 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 784 | return result; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 785 | } |
| 786 | if (chand->resolver != NULL && !chand->started_resolving) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 787 | chand->started_resolving = true; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 788 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 789 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 790 | &chand->on_resolver_result_changed); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 791 | } |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 792 | if (chand->resolver != NULL) { |
| 793 | cpa = gpr_malloc(sizeof(*cpa)); |
| 794 | cpa->initial_metadata = initial_metadata; |
| 795 | cpa->initial_metadata_flags = initial_metadata_flags; |
| 796 | cpa->connected_subchannel = connected_subchannel; |
| 797 | cpa->on_ready = on_ready; |
| 798 | cpa->elem = elem; |
| 799 | grpc_closure_init(&cpa->closure, continue_picking, cpa); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 800 | grpc_closure_list_append(&chand->waiting_for_config_closures, &cpa->closure, |
| 801 | GRPC_ERROR_NONE); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 802 | } else { |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 803 | grpc_exec_ctx_sched(exec_ctx, on_ready, GRPC_ERROR_CREATE("Disconnected"), |
| 804 | NULL); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 805 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 806 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 807 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 808 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 809 | return false; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 810 | } |
| 811 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 812 | // The logic here is fairly complicated, due to (a) the fact that we |
| 813 | // need to handle the case where we receive the send op before the |
| 814 | // initial metadata op, and (b) the need for efficiency, especially in |
| 815 | // the streaming case. |
| 816 | // TODO(ctiller): Explain this more thoroughly. |
| 817 | static void cc_start_transport_stream_op(grpc_exec_ctx *exec_ctx, |
| 818 | grpc_call_element *elem, |
| 819 | grpc_transport_stream_op *op) { |
| 820 | call_data *calld = elem->call_data; |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 821 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 822 | GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 823 | grpc_deadline_state_client_start_transport_stream_op(exec_ctx, elem, op); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 824 | /* try to (atomically) get the call */ |
| 825 | grpc_subchannel_call *call = GET_CALL(calld); |
| 826 | GPR_TIMER_BEGIN("cc_start_transport_stream_op", 0); |
| 827 | if (call == CANCELLED_CALL) { |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 828 | grpc_transport_stream_op_finish_with_failure( |
| 829 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 830 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 831 | return; |
| 832 | } |
| 833 | if (call != NULL) { |
| 834 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
| 835 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 836 | return; |
| 837 | } |
| 838 | /* we failed; lock and figure out what to do */ |
| 839 | gpr_mu_lock(&calld->mu); |
| 840 | retry: |
| 841 | /* need to recheck that another thread hasn't set the call */ |
| 842 | call = GET_CALL(calld); |
| 843 | if (call == CANCELLED_CALL) { |
| 844 | gpr_mu_unlock(&calld->mu); |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 845 | grpc_transport_stream_op_finish_with_failure( |
| 846 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 847 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 848 | return; |
| 849 | } |
| 850 | if (call != NULL) { |
| 851 | gpr_mu_unlock(&calld->mu); |
| 852 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
| 853 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 854 | return; |
| 855 | } |
| 856 | /* if this is a cancellation, then we can raise our cancelled flag */ |
| 857 | if (op->cancel_error != GRPC_ERROR_NONE) { |
| 858 | if (!gpr_atm_rel_cas(&calld->subchannel_call, 0, |
| 859 | (gpr_atm)(uintptr_t)CANCELLED_CALL)) { |
| 860 | goto retry; |
| 861 | } else { |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 862 | // Stash a copy of cancel_error in our call data, so that we can use |
| 863 | // it for subsequent operations. This ensures that if the call is |
| 864 | // cancelled before any ops are passed down (e.g., if the deadline |
| 865 | // is in the past when the call starts), we can return the right |
| 866 | // error to the caller when the first op does get passed down. |
| 867 | calld->cancel_error = GRPC_ERROR_REF(op->cancel_error); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 868 | switch (calld->creation_phase) { |
| 869 | case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING: |
| 870 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(op->cancel_error)); |
| 871 | break; |
| 872 | case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL: |
Mark D. Roth | d4c0f55 | 2016-09-01 09:25:32 -0700 | [diff] [blame] | 873 | pick_subchannel(exec_ctx, elem, NULL, 0, &calld->connected_subchannel, |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 874 | NULL, GRPC_ERROR_REF(op->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 875 | break; |
| 876 | } |
| 877 | gpr_mu_unlock(&calld->mu); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 878 | grpc_transport_stream_op_finish_with_failure( |
| 879 | exec_ctx, op, GRPC_ERROR_REF(op->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 880 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 881 | return; |
| 882 | } |
| 883 | } |
| 884 | /* if we don't have a subchannel, try to get one */ |
| 885 | if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && |
| 886 | calld->connected_subchannel == NULL && |
| 887 | op->send_initial_metadata != NULL) { |
| 888 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL; |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 889 | grpc_closure_init(&calld->next_step, subchannel_ready, elem); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 890 | GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel"); |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 891 | /* If a subchannel is not available immediately, the polling entity from |
| 892 | call_data should be provided to channel_data's interested_parties, so |
| 893 | that IO of the lb_policy and resolver could be done under it. */ |
Mark D. Roth | d4c0f55 | 2016-09-01 09:25:32 -0700 | [diff] [blame] | 894 | if (pick_subchannel(exec_ctx, elem, op->send_initial_metadata, |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 895 | op->send_initial_metadata_flags, |
| 896 | &calld->connected_subchannel, &calld->next_step, |
| 897 | GRPC_ERROR_NONE)) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 898 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 899 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 900 | } else { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 901 | grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent, |
| 902 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 903 | } |
| 904 | } |
| 905 | /* if we've got a subchannel, then let's ask it to create a call */ |
| 906 | if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && |
| 907 | calld->connected_subchannel != NULL) { |
| 908 | grpc_subchannel_call *subchannel_call = NULL; |
| 909 | grpc_error *error = grpc_connected_subchannel_create_call( |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 910 | exec_ctx, calld->connected_subchannel, calld->pollent, calld->path, |
Mark D. Roth | 3d88341 | 2016-11-07 13:42:54 -0800 | [diff] [blame] | 911 | calld->call_start_time, calld->deadline, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 912 | if (error != GRPC_ERROR_NONE) { |
| 913 | subchannel_call = CANCELLED_CALL; |
| 914 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(error)); |
| 915 | grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error); |
| 916 | } |
| 917 | gpr_atm_rel_store(&calld->subchannel_call, |
| 918 | (gpr_atm)(uintptr_t)subchannel_call); |
| 919 | retry_waiting_locked(exec_ctx, calld); |
| 920 | goto retry; |
| 921 | } |
| 922 | /* nothing to be done but wait */ |
| 923 | add_waiting_locked(calld, op); |
| 924 | gpr_mu_unlock(&calld->mu); |
| 925 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 926 | } |
| 927 | |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 928 | // Gets data from the service config. Invoked when the resolver returns |
| 929 | // its initial result. |
| 930 | static void read_service_config(grpc_exec_ctx *exec_ctx, void *arg, |
| 931 | grpc_error *error) { |
| 932 | grpc_call_element *elem = arg; |
| 933 | channel_data *chand = elem->channel_data; |
| 934 | call_data *calld = elem->call_data; |
| 935 | // If this is an error, there's no point in looking at the service config. |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 936 | if (error == GRPC_ERROR_NONE) { |
| 937 | // Get the method config table from channel data. |
| 938 | gpr_mu_lock(&chand->mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 939 | grpc_mdstr_hash_table *method_params_table = NULL; |
| 940 | if (chand->method_params_table != NULL) { |
| 941 | method_params_table = |
| 942 | grpc_mdstr_hash_table_ref(chand->method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 943 | } |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 944 | gpr_mu_unlock(&chand->mu); |
| 945 | // If the method config table was present, use it. |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 946 | if (method_params_table != NULL) { |
| 947 | const method_parameters *method_params = |
| 948 | grpc_method_config_table_get(method_params_table, calld->path); |
| 949 | if (method_params != NULL) { |
| 950 | const bool have_method_timeout = |
| 951 | gpr_time_cmp(method_params->timeout, gpr_time_0(GPR_TIMESPAN)) != 0; |
| 952 | if (have_method_timeout || |
| 953 | method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 954 | gpr_mu_lock(&calld->mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 955 | if (have_method_timeout) { |
| 956 | const gpr_timespec per_method_deadline = |
| 957 | gpr_time_add(calld->call_start_time, method_params->timeout); |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 958 | if (gpr_time_cmp(per_method_deadline, calld->deadline) < 0) { |
| 959 | calld->deadline = per_method_deadline; |
| 960 | // Reset deadline timer. |
| 961 | grpc_deadline_state_reset(exec_ctx, elem, calld->deadline); |
| 962 | } |
| 963 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 964 | if (method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 965 | calld->wait_for_ready_from_service_config = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 966 | method_params->wait_for_ready; |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 967 | } |
| 968 | gpr_mu_unlock(&calld->mu); |
| 969 | } |
| 970 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 971 | grpc_mdstr_hash_table_unref(method_params_table); |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 972 | } |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 973 | } |
Mark D. Roth | 31292f2 | 2016-10-12 13:14:07 -0700 | [diff] [blame] | 974 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "read_service_config"); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 975 | } |
| 976 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 977 | /* Constructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 978 | static grpc_error *cc_init_call_elem(grpc_exec_ctx *exec_ctx, |
| 979 | grpc_call_element *elem, |
| 980 | grpc_call_element_args *args) { |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 981 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 982 | call_data *calld = elem->call_data; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 983 | // Initialize data members. |
| 984 | grpc_deadline_state_init(exec_ctx, elem, args->call_stack); |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 985 | calld->path = GRPC_MDSTR_REF(args->path); |
Mark D. Roth | ff08f33 | 2016-10-14 13:01:01 -0700 | [diff] [blame] | 986 | calld->call_start_time = args->start_time; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 987 | calld->deadline = gpr_convert_clock_type(args->deadline, GPR_CLOCK_MONOTONIC); |
| 988 | calld->wait_for_ready_from_service_config = WAIT_FOR_READY_UNSET; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 989 | calld->cancel_error = GRPC_ERROR_NONE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 990 | gpr_atm_rel_store(&calld->subchannel_call, 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 991 | gpr_mu_init(&calld->mu); |
| 992 | calld->connected_subchannel = NULL; |
| 993 | calld->waiting_ops = NULL; |
| 994 | calld->waiting_ops_count = 0; |
| 995 | calld->waiting_ops_capacity = 0; |
| 996 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 997 | calld->owning_call = args->call_stack; |
| 998 | calld->pollent = NULL; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 999 | // If the resolver has already returned results, then we can access |
| 1000 | // the service config parameters immediately. Otherwise, we need to |
| 1001 | // defer that work until the resolver returns an initial result. |
| 1002 | // TODO(roth): This code is almost but not quite identical to the code |
| 1003 | // in read_service_config() above. It would be nice to find a way to |
| 1004 | // combine them, to avoid having to maintain it twice. |
| 1005 | gpr_mu_lock(&chand->mu); |
| 1006 | if (chand->lb_policy != NULL) { |
| 1007 | // We already have a resolver result, so check for service config. |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1008 | if (chand->method_params_table != NULL) { |
| 1009 | grpc_mdstr_hash_table *method_params_table = |
| 1010 | grpc_mdstr_hash_table_ref(chand->method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1011 | gpr_mu_unlock(&chand->mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1012 | method_parameters *method_params = |
| 1013 | grpc_method_config_table_get(method_params_table, args->path); |
| 1014 | if (method_params != NULL) { |
| 1015 | if (gpr_time_cmp(method_params->timeout, |
| 1016 | gpr_time_0(GPR_CLOCK_MONOTONIC)) != 0) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1017 | gpr_timespec per_method_deadline = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1018 | gpr_time_add(calld->call_start_time, method_params->timeout); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1019 | calld->deadline = gpr_time_min(calld->deadline, per_method_deadline); |
| 1020 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1021 | if (method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1022 | calld->wait_for_ready_from_service_config = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1023 | method_params->wait_for_ready; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1024 | } |
| 1025 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1026 | grpc_mdstr_hash_table_unref(method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1027 | } else { |
| 1028 | gpr_mu_unlock(&chand->mu); |
| 1029 | } |
| 1030 | } else { |
| 1031 | // We don't yet have a resolver result, so register a callback to |
| 1032 | // get the service config data once the resolver returns. |
Mark D. Roth | 31292f2 | 2016-10-12 13:14:07 -0700 | [diff] [blame] | 1033 | // Take a reference to the call stack to be owned by the callback. |
| 1034 | GRPC_CALL_STACK_REF(calld->owning_call, "read_service_config"); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1035 | grpc_closure_init(&calld->read_service_config, read_service_config, elem); |
| 1036 | grpc_closure_list_append(&chand->waiting_for_config_closures, |
| 1037 | &calld->read_service_config, GRPC_ERROR_NONE); |
| 1038 | gpr_mu_unlock(&chand->mu); |
| 1039 | } |
| 1040 | // Start the deadline timer with the current deadline value. If we |
| 1041 | // do not yet have service config data, then the timer may be reset |
| 1042 | // later. |
| 1043 | grpc_deadline_state_start(exec_ctx, elem, calld->deadline); |
Mark D. Roth | 0badbe8 | 2016-06-23 10:15:12 -0700 | [diff] [blame] | 1044 | return GRPC_ERROR_NONE; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1045 | } |
| 1046 | |
| 1047 | /* Destructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1048 | static void cc_destroy_call_elem(grpc_exec_ctx *exec_ctx, |
| 1049 | grpc_call_element *elem, |
| 1050 | const grpc_call_final_info *final_info, |
| 1051 | void *and_free_memory) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1052 | call_data *calld = elem->call_data; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1053 | grpc_deadline_state_destroy(exec_ctx, elem); |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 1054 | GRPC_MDSTR_UNREF(calld->path); |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1055 | GRPC_ERROR_UNREF(calld->cancel_error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1056 | grpc_subchannel_call *call = GET_CALL(calld); |
| 1057 | if (call != NULL && call != CANCELLED_CALL) { |
| 1058 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "client_channel_destroy_call"); |
| 1059 | } |
| 1060 | GPR_ASSERT(calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING); |
| 1061 | gpr_mu_destroy(&calld->mu); |
| 1062 | GPR_ASSERT(calld->waiting_ops_count == 0); |
Craig Tiller | 693d394 | 2016-10-27 16:51:25 -0700 | [diff] [blame] | 1063 | if (calld->connected_subchannel != NULL) { |
| 1064 | GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, calld->connected_subchannel, |
| 1065 | "picked"); |
| 1066 | } |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1067 | gpr_free(calld->waiting_ops); |
Craig Tiller | 2c8063c | 2016-03-22 22:12:15 -0700 | [diff] [blame] | 1068 | gpr_free(and_free_memory); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1069 | } |
| 1070 | |
David Garcia Quintas | f72eb97 | 2016-05-03 18:28:09 -0700 | [diff] [blame] | 1071 | static void cc_set_pollset_or_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1072 | grpc_call_element *elem, |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1073 | grpc_polling_entity *pollent) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1074 | call_data *calld = elem->call_data; |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1075 | calld->pollent = pollent; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1076 | } |
| 1077 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1078 | /************************************************************************* |
| 1079 | * EXPORTED SYMBOLS |
| 1080 | */ |
| 1081 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1082 | const grpc_channel_filter grpc_client_channel_filter = { |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1083 | cc_start_transport_stream_op, |
| 1084 | cc_start_transport_op, |
| 1085 | sizeof(call_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1086 | cc_init_call_elem, |
David Garcia Quintas | 4afce7e | 2016-04-18 16:25:17 -0700 | [diff] [blame] | 1087 | cc_set_pollset_or_pollset_set, |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1088 | cc_destroy_call_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1089 | sizeof(channel_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1090 | cc_init_channel_elem, |
| 1091 | cc_destroy_channel_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1092 | cc_get_peer, |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 1093 | cc_get_channel_info, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1094 | "client-channel", |
Craig Tiller | 87d5b19 | 2015-04-16 14:37:57 -0700 | [diff] [blame] | 1095 | }; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1096 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1097 | grpc_connectivity_state grpc_client_channel_check_connectivity_state( |
| 1098 | grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, int try_to_connect) { |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1099 | channel_data *chand = elem->channel_data; |
| 1100 | grpc_connectivity_state out; |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1101 | gpr_mu_lock(&chand->mu); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 1102 | out = grpc_connectivity_state_check(&chand->state_tracker, NULL); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1103 | if (out == GRPC_CHANNEL_IDLE && try_to_connect) { |
| 1104 | if (chand->lb_policy != NULL) { |
| 1105 | grpc_lb_policy_exit_idle(exec_ctx, chand->lb_policy); |
| 1106 | } else { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1107 | chand->exit_idle_when_lb_policy_arrives = true; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1108 | if (!chand->started_resolving && chand->resolver != NULL) { |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1109 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1110 | chand->started_resolving = true; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 1111 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1112 | &chand->on_resolver_result_changed); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1113 | } |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1114 | } |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1115 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1116 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1117 | return out; |
| 1118 | } |
| 1119 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1120 | typedef struct { |
| 1121 | channel_data *chand; |
| 1122 | grpc_pollset *pollset; |
| 1123 | grpc_closure *on_complete; |
| 1124 | grpc_closure my_closure; |
| 1125 | } external_connectivity_watcher; |
| 1126 | |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1127 | static void on_external_watch_complete(grpc_exec_ctx *exec_ctx, void *arg, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 1128 | grpc_error *error) { |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1129 | external_connectivity_watcher *w = arg; |
| 1130 | grpc_closure *follow_up = w->on_complete; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1131 | grpc_pollset_set_del_pollset(exec_ctx, w->chand->interested_parties, |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1132 | w->pollset); |
| 1133 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, |
| 1134 | "external_connectivity_watcher"); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1135 | gpr_free(w); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 1136 | follow_up->cb(exec_ctx, follow_up->cb_arg, error); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1137 | } |
| 1138 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1139 | void grpc_client_channel_watch_connectivity_state( |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1140 | grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, grpc_pollset *pollset, |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1141 | grpc_connectivity_state *state, grpc_closure *on_complete) { |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1142 | channel_data *chand = elem->channel_data; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1143 | external_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
| 1144 | w->chand = chand; |
| 1145 | w->pollset = pollset; |
| 1146 | w->on_complete = on_complete; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1147 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, pollset); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1148 | grpc_closure_init(&w->my_closure, on_external_watch_complete, w); |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1149 | GRPC_CHANNEL_STACK_REF(w->chand->owning_stack, |
| 1150 | "external_connectivity_watcher"); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1151 | gpr_mu_lock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1152 | grpc_connectivity_state_notify_on_state_change( |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1153 | exec_ctx, &chand->state_tracker, state, &w->my_closure); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1154 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1155 | } |