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 | 2137cd8 | 2016-09-14 09:04:00 -0700 | [diff] [blame] | 47 | #include "src/core/ext/client_channel/subchannel.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 48 | #include "src/core/lib/channel/channel_args.h" |
| 49 | #include "src/core/lib/channel/connected_channel.h" |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 50 | #include "src/core/lib/channel/deadline_filter.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 51 | #include "src/core/lib/iomgr/iomgr.h" |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 52 | #include "src/core/lib/iomgr/polling_entity.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 53 | #include "src/core/lib/profiling/timers.h" |
| 54 | #include "src/core/lib/support/string.h" |
| 55 | #include "src/core/lib/surface/channel.h" |
| 56 | #include "src/core/lib/transport/connectivity_state.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 57 | #include "src/core/lib/transport/metadata.h" |
| 58 | #include "src/core/lib/transport/metadata_batch.h" |
Mark D. Roth | ea846a0 | 2016-11-03 11:32:54 -0700 | [diff] [blame] | 59 | #include "src/core/lib/transport/service_config.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 60 | #include "src/core/lib/transport/static_metadata.h" |
Craig Tiller | 8910ac6 | 2015-10-08 16:49:15 -0700 | [diff] [blame] | 61 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 62 | /* Client channel implementation */ |
| 63 | |
Mark D. Roth | 26b7be4 | 2016-10-24 10:08:07 -0700 | [diff] [blame] | 64 | /************************************************************************* |
| 65 | * METHOD-CONFIG TABLE |
| 66 | */ |
| 67 | |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 68 | typedef enum { |
| 69 | WAIT_FOR_READY_UNSET, |
| 70 | WAIT_FOR_READY_FALSE, |
| 71 | WAIT_FOR_READY_TRUE |
| 72 | } wait_for_ready_value; |
| 73 | |
| 74 | typedef struct method_parameters { |
| 75 | gpr_timespec timeout; |
| 76 | wait_for_ready_value wait_for_ready; |
| 77 | } method_parameters; |
| 78 | |
| 79 | static void *method_parameters_copy(void *value) { |
| 80 | void *new_value = gpr_malloc(sizeof(method_parameters)); |
| 81 | memcpy(new_value, value, sizeof(method_parameters)); |
| 82 | return new_value; |
| 83 | } |
| 84 | |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 85 | static const grpc_mdstr_hash_table_vtable method_parameters_vtable = { |
Mark D. Roth | 6ad8057 | 2016-11-03 08:33:17 -0700 | [diff] [blame] | 86 | gpr_free, method_parameters_copy}; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 87 | |
Mark D. Roth | e30baeb | 2016-11-03 08:16:19 -0700 | [diff] [blame] | 88 | static void *method_parameters_create_from_json(const grpc_json *json) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 89 | wait_for_ready_value wait_for_ready = WAIT_FOR_READY_UNSET; |
Mark D. Roth | 47f1084 | 2016-11-03 08:45:27 -0700 | [diff] [blame] | 90 | gpr_timespec timeout = {0, 0, GPR_TIMESPAN}; |
| 91 | for (grpc_json *field = json->child; field != NULL; field = field->next) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 92 | if (field->key == NULL) continue; |
| 93 | if (strcmp(field->key, "wait_for_ready") == 0) { |
| 94 | if (wait_for_ready != WAIT_FOR_READY_UNSET) return NULL; // Duplicate. |
| 95 | if (field->type != GRPC_JSON_TRUE && field->type != GRPC_JSON_FALSE) { |
| 96 | return NULL; |
| 97 | } |
Mark D. Roth | 47f1084 | 2016-11-03 08:45:27 -0700 | [diff] [blame] | 98 | wait_for_ready = field->type == GRPC_JSON_TRUE ? WAIT_FOR_READY_TRUE |
| 99 | : WAIT_FOR_READY_FALSE; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 100 | } else if (strcmp(field->key, "timeout") == 0) { |
| 101 | if (timeout.tv_sec > 0 || timeout.tv_nsec > 0) return NULL; // Duplicate. |
| 102 | if (field->type != GRPC_JSON_OBJECT) return NULL; |
| 103 | if (field->child == NULL) return NULL; |
Mark D. Roth | 47f1084 | 2016-11-03 08:45:27 -0700 | [diff] [blame] | 104 | for (grpc_json *subfield = field->child; subfield != NULL; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 105 | subfield = subfield->next) { |
| 106 | if (subfield->key == NULL) return NULL; |
| 107 | if (strcmp(subfield->key, "seconds") == 0) { |
| 108 | if (timeout.tv_sec > 0) return NULL; // Duplicate. |
| 109 | if (subfield->type != GRPC_JSON_NUMBER) return NULL; |
| 110 | timeout.tv_sec = gpr_parse_nonnegative_number(subfield->value); |
| 111 | if (timeout.tv_sec == -1) return NULL; |
| 112 | } else if (strcmp(subfield->key, "nanos") == 0) { |
| 113 | if (timeout.tv_nsec > 0) return NULL; // Duplicate. |
| 114 | if (subfield->type != GRPC_JSON_NUMBER) return NULL; |
| 115 | timeout.tv_nsec = gpr_parse_nonnegative_number(subfield->value); |
| 116 | if (timeout.tv_nsec == -1) return NULL; |
| 117 | } else { |
| 118 | // Unknown key. |
| 119 | return NULL; |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 124 | method_parameters *value = gpr_malloc(sizeof(method_parameters)); |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 125 | value->timeout = timeout; |
| 126 | value->wait_for_ready = wait_for_ready; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 127 | return value; |
| 128 | } |
| 129 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 130 | /************************************************************************* |
| 131 | * CHANNEL-WIDE FUNCTIONS |
| 132 | */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 133 | |
Craig Tiller | 800dacb | 2015-10-06 09:10:26 -0700 | [diff] [blame] | 134 | typedef struct client_channel_channel_data { |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 135 | /** resolver for this channel */ |
| 136 | grpc_resolver *resolver; |
Craig Tiller | 20a3c35 | 2015-08-05 08:39:50 -0700 | [diff] [blame] | 137 | /** have we started resolving this channel */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 138 | bool started_resolving; |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 139 | /** client channel factory */ |
| 140 | grpc_client_channel_factory *client_channel_factory; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 141 | |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 142 | /** mutex protecting all variables below in this data structure */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 143 | gpr_mu mu; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 144 | /** currently active load balancer */ |
Mark D. Roth | 78afd77 | 2016-11-04 12:49:49 -0700 | [diff] [blame] | 145 | char *lb_policy_name; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 146 | grpc_lb_policy *lb_policy; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 147 | /** service config in JSON form */ |
| 148 | char *service_config_json; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 149 | /** maps method names to method_parameters structs */ |
| 150 | grpc_mdstr_hash_table *method_params_table; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 151 | /** incoming resolver result - set by resolver.next() */ |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 152 | grpc_channel_args *resolver_result; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 153 | /** 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] | 154 | grpc_closure_list waiting_for_config_closures; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 155 | /** resolver callback */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 156 | grpc_closure on_resolver_result_changed; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 157 | /** connectivity state being tracked */ |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 158 | grpc_connectivity_state_tracker state_tracker; |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 159 | /** when an lb_policy arrives, should we try to exit idle */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 160 | bool exit_idle_when_lb_policy_arrives; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 161 | /** owning stack */ |
| 162 | grpc_channel_stack *owning_stack; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 163 | /** interested parties (owned) */ |
| 164 | grpc_pollset_set *interested_parties; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 165 | } channel_data; |
| 166 | |
Craig Tiller | d6c98df | 2015-08-18 09:33:44 -0700 | [diff] [blame] | 167 | /** 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] | 168 | resolver, to watch for state changes from the lb_policy. When a state |
| 169 | change is seen, we update the channel, and create a new watcher. */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 170 | typedef struct { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 171 | channel_data *chand; |
Craig Tiller | 3382511 | 2015-09-18 07:44:19 -0700 | [diff] [blame] | 172 | grpc_closure on_changed; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 173 | grpc_connectivity_state state; |
| 174 | grpc_lb_policy *lb_policy; |
| 175 | } lb_policy_connectivity_watcher; |
| 176 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 177 | static void watch_lb_policy(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 178 | grpc_lb_policy *lb_policy, |
| 179 | grpc_connectivity_state current_state); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 180 | |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 181 | static void set_channel_connectivity_state_locked(grpc_exec_ctx *exec_ctx, |
| 182 | channel_data *chand, |
| 183 | grpc_connectivity_state state, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 184 | grpc_error *error, |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 185 | const char *reason) { |
| 186 | if ((state == GRPC_CHANNEL_TRANSIENT_FAILURE || |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 187 | state == GRPC_CHANNEL_SHUTDOWN) && |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 188 | chand->lb_policy != NULL) { |
Mark D. Roth | 59c9f90 | 2016-09-28 13:33:21 -0700 | [diff] [blame] | 189 | /* cancel picks with wait_for_ready=false */ |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 190 | grpc_lb_policy_cancel_picks( |
| 191 | exec_ctx, chand->lb_policy, |
Mark D. Roth | 59c9f90 | 2016-09-28 13:33:21 -0700 | [diff] [blame] | 192 | /* mask= */ GRPC_INITIAL_METADATA_WAIT_FOR_READY, |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 193 | /* check= */ 0, GRPC_ERROR_REF(error)); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 194 | } |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 195 | grpc_connectivity_state_set(exec_ctx, &chand->state_tracker, state, error, |
| 196 | reason); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 197 | } |
| 198 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 199 | static void on_lb_policy_state_changed_locked(grpc_exec_ctx *exec_ctx, |
| 200 | lb_policy_connectivity_watcher *w, |
| 201 | grpc_error *error) { |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 202 | grpc_connectivity_state publish_state = w->state; |
Craig Tiller | 5795da7 | 2015-09-17 15:27:13 -0700 | [diff] [blame] | 203 | /* check if the notification is for a stale policy */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 204 | if (w->lb_policy != w->chand->lb_policy) return; |
Craig Tiller | 5795da7 | 2015-09-17 15:27:13 -0700 | [diff] [blame] | 205 | |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 206 | if (publish_state == GRPC_CHANNEL_SHUTDOWN && w->chand->resolver != NULL) { |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 207 | publish_state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
| 208 | grpc_resolver_channel_saw_error(exec_ctx, w->chand->resolver); |
Craig Tiller | f62c4d5 | 2015-12-04 07:43:07 -0800 | [diff] [blame] | 209 | GRPC_LB_POLICY_UNREF(exec_ctx, w->chand->lb_policy, "channel"); |
| 210 | w->chand->lb_policy = NULL; |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 211 | } |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 212 | set_channel_connectivity_state_locked(exec_ctx, w->chand, publish_state, |
Craig Tiller | fc353d6 | 2016-05-10 12:58:03 -0700 | [diff] [blame] | 213 | GRPC_ERROR_REF(error), "lb_changed"); |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 214 | if (w->state != GRPC_CHANNEL_SHUTDOWN) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 215 | watch_lb_policy(exec_ctx, w->chand, w->lb_policy, w->state); |
| 216 | } |
Craig Tiller | 5795da7 | 2015-09-17 15:27:13 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 219 | 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] | 220 | grpc_error *error) { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 221 | lb_policy_connectivity_watcher *w = arg; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 222 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 223 | gpr_mu_lock(&w->chand->mu); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 224 | on_lb_policy_state_changed_locked(exec_ctx, w, error); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 225 | gpr_mu_unlock(&w->chand->mu); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 226 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 227 | 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] | 228 | gpr_free(w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 231 | static void watch_lb_policy(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 232 | grpc_lb_policy *lb_policy, |
| 233 | grpc_connectivity_state current_state) { |
| 234 | lb_policy_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 235 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "watch_lb_policy"); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 236 | |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 237 | w->chand = chand; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 238 | grpc_closure_init(&w->on_changed, on_lb_policy_state_changed, w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 239 | w->state = current_state; |
| 240 | w->lb_policy = lb_policy; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 241 | grpc_lb_policy_notify_on_state_change(exec_ctx, lb_policy, &w->state, |
| 242 | &w->on_changed); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 245 | static void on_resolver_result_changed(grpc_exec_ctx *exec_ctx, void *arg, |
| 246 | grpc_error *error) { |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 247 | channel_data *chand = arg; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 248 | char *lb_policy_name = NULL; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 249 | grpc_lb_policy *lb_policy = NULL; |
| 250 | grpc_lb_policy *old_lb_policy; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 251 | grpc_mdstr_hash_table *method_params_table = NULL; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 252 | grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 253 | bool exit_idle = false; |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 254 | grpc_error *state_error = GRPC_ERROR_CREATE("No load balancing policy"); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 255 | char *service_config_json = NULL; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 256 | |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 257 | if (chand->resolver_result != NULL) { |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 258 | // Find LB policy name. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 259 | const grpc_arg *channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 260 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_LB_POLICY_NAME); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 261 | if (channel_arg != NULL) { |
| 262 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
| 263 | lb_policy_name = channel_arg->value.string; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 264 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 265 | // Special case: If all of the addresses are balancer addresses, |
| 266 | // assume that we should use the grpclb policy, regardless of what the |
| 267 | // resolver actually specified. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 268 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 269 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_LB_ADDRESSES); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 270 | if (channel_arg != NULL) { |
| 271 | GPR_ASSERT(channel_arg->type == GRPC_ARG_POINTER); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 272 | grpc_lb_addresses *addresses = channel_arg->value.pointer.p; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 273 | bool found_backend_address = false; |
| 274 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 275 | if (!addresses->addresses[i].is_balancer) { |
| 276 | found_backend_address = true; |
| 277 | break; |
| 278 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 279 | } |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 280 | if (!found_backend_address) { |
| 281 | if (lb_policy_name != NULL && strcmp(lb_policy_name, "grpclb") != 0) { |
| 282 | gpr_log(GPR_INFO, |
| 283 | "resolver requested LB policy %s but provided only balancer " |
| 284 | "addresses, no backend addresses -- forcing use of grpclb LB " |
| 285 | "policy", |
Mark D. Roth | 5f40e5d | 2016-10-24 13:09:05 -0700 | [diff] [blame] | 286 | lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 287 | } |
| 288 | lb_policy_name = "grpclb"; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 289 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 290 | } |
| 291 | // Use pick_first if nothing was specified and we didn't select grpclb |
| 292 | // above. |
| 293 | if (lb_policy_name == NULL) lb_policy_name = "pick_first"; |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 294 | // Instantiate LB policy. |
| 295 | grpc_lb_policy_args lb_policy_args; |
| 296 | lb_policy_args.args = chand->resolver_result; |
| 297 | lb_policy_args.client_channel_factory = chand->client_channel_factory; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 298 | lb_policy = |
| 299 | grpc_lb_policy_create(exec_ctx, lb_policy_name, &lb_policy_args); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 300 | if (lb_policy != NULL) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 301 | GRPC_LB_POLICY_REF(lb_policy, "config_change"); |
Craig Tiller | f707d62 | 2016-05-06 14:26:12 -0700 | [diff] [blame] | 302 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 303 | state = |
| 304 | grpc_lb_policy_check_connectivity(exec_ctx, lb_policy, &state_error); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 305 | } |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 306 | // Find service config. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 307 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 308 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_SERVICE_CONFIG); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 309 | if (channel_arg != NULL) { |
Mark D. Roth | 9ec28af | 2016-11-03 12:32:39 -0700 | [diff] [blame] | 310 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 311 | service_config_json = gpr_strdup(channel_arg->value.string); |
Mark D. Roth | 70a1abd | 2016-11-04 09:26:37 -0700 | [diff] [blame] | 312 | grpc_service_config *service_config = |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 313 | grpc_service_config_create(service_config_json); |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 314 | if (service_config != NULL) { |
| 315 | method_params_table = grpc_service_config_create_method_config_table( |
| 316 | service_config, method_parameters_create_from_json, |
| 317 | &method_parameters_vtable); |
| 318 | grpc_service_config_destroy(service_config); |
| 319 | } |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 320 | } |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 321 | // Before we clean up, save a copy of lb_policy_name, since it might |
| 322 | // be pointing to data inside chand->resolver_result. |
| 323 | // The copy will be saved in chand->lb_policy_name below. |
| 324 | lb_policy_name = gpr_strdup(lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 325 | grpc_channel_args_destroy(chand->resolver_result); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 326 | chand->resolver_result = NULL; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 329 | if (lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 330 | grpc_pollset_set_add_pollset_set(exec_ctx, lb_policy->interested_parties, |
| 331 | chand->interested_parties); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 332 | } |
| 333 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 334 | gpr_mu_lock(&chand->mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 335 | if (lb_policy_name != NULL) { |
| 336 | gpr_free(chand->lb_policy_name); |
| 337 | chand->lb_policy_name = lb_policy_name; |
| 338 | } |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 339 | old_lb_policy = chand->lb_policy; |
| 340 | chand->lb_policy = lb_policy; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 341 | if (service_config_json != NULL) { |
| 342 | gpr_free(chand->service_config_json); |
| 343 | chand->service_config_json = service_config_json; |
| 344 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 345 | if (chand->method_params_table != NULL) { |
| 346 | grpc_mdstr_hash_table_unref(chand->method_params_table); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 347 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 348 | chand->method_params_table = method_params_table; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 349 | if (lb_policy != NULL) { |
| 350 | grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures, |
| 351 | NULL); |
| 352 | } else if (chand->resolver == NULL /* disconnected */) { |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 353 | grpc_closure_list_fail_all( |
| 354 | &chand->waiting_for_config_closures, |
| 355 | GRPC_ERROR_CREATE_REFERENCING("Channel disconnected", &error, 1)); |
Craig Tiller | 6c39686 | 2016-01-28 13:53:40 -0800 | [diff] [blame] | 356 | grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures, |
| 357 | NULL); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 358 | } |
| 359 | if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) { |
| 360 | GRPC_LB_POLICY_REF(lb_policy, "exit_idle"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 361 | exit_idle = true; |
| 362 | chand->exit_idle_when_lb_policy_arrives = false; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 363 | } |
Craig Tiller | 9846503 | 2015-06-29 14:36:42 -0700 | [diff] [blame] | 364 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 365 | if (error == GRPC_ERROR_NONE && chand->resolver) { |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 366 | set_channel_connectivity_state_locked( |
| 367 | exec_ctx, chand, state, GRPC_ERROR_REF(state_error), "new_lb+resolver"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 368 | if (lb_policy != NULL) { |
| 369 | watch_lb_policy(exec_ctx, chand, lb_policy, state); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 370 | } |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 371 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 372 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 373 | &chand->on_resolver_result_changed); |
| 374 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 375 | } else { |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 376 | if (chand->resolver != NULL) { |
| 377 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 378 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 379 | chand->resolver = NULL; |
| 380 | } |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 381 | grpc_error *refs[] = {error, state_error}; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 382 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 383 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 384 | GRPC_ERROR_CREATE_REFERENCING("Got config after disconnection", refs, |
| 385 | GPR_ARRAY_SIZE(refs)), |
| 386 | "resolver_gone"); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 387 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 388 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 389 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 390 | if (exit_idle) { |
| 391 | grpc_lb_policy_exit_idle(exec_ctx, lb_policy); |
| 392 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "exit_idle"); |
| 393 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 394 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 395 | if (old_lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 396 | grpc_pollset_set_del_pollset_set( |
| 397 | exec_ctx, old_lb_policy->interested_parties, chand->interested_parties); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 398 | GRPC_LB_POLICY_UNREF(exec_ctx, old_lb_policy, "channel"); |
| 399 | } |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 400 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 401 | if (lb_policy != NULL) { |
| 402 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "config_change"); |
| 403 | } |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 404 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 405 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver"); |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 406 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 407 | } |
| 408 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 409 | static void cc_start_transport_op(grpc_exec_ctx *exec_ctx, |
| 410 | grpc_channel_element *elem, |
| 411 | grpc_transport_op *op) { |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 412 | channel_data *chand = elem->channel_data; |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 413 | |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 414 | 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] | 415 | |
Craig Tiller | d7f12e3 | 2016-03-03 10:08:31 -0800 | [diff] [blame] | 416 | GPR_ASSERT(op->set_accept_stream == false); |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 417 | if (op->bind_pollset != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 418 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, |
Craig Tiller | e2c6237 | 2015-12-07 16:11:03 -0800 | [diff] [blame] | 419 | op->bind_pollset); |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 420 | } |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 421 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 422 | gpr_mu_lock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 423 | if (op->on_connectivity_state_change != NULL) { |
| 424 | grpc_connectivity_state_notify_on_state_change( |
| 425 | exec_ctx, &chand->state_tracker, op->connectivity_state, |
| 426 | op->on_connectivity_state_change); |
| 427 | op->on_connectivity_state_change = NULL; |
| 428 | op->connectivity_state = NULL; |
| 429 | } |
| 430 | |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 431 | if (op->send_ping != NULL) { |
Craig Tiller | 87b71e2 | 2015-12-07 15:14:14 -0800 | [diff] [blame] | 432 | if (chand->lb_policy == NULL) { |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 433 | grpc_exec_ctx_sched(exec_ctx, op->send_ping, |
| 434 | GRPC_ERROR_CREATE("Ping with no load balancing"), |
| 435 | NULL); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 436 | } else { |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 437 | 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] | 438 | op->bind_pollset = NULL; |
| 439 | } |
| 440 | op->send_ping = NULL; |
| 441 | } |
| 442 | |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 443 | if (op->disconnect_with_error != GRPC_ERROR_NONE) { |
| 444 | if (chand->resolver != NULL) { |
| 445 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 446 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 447 | GRPC_ERROR_REF(op->disconnect_with_error), "disconnect"); |
| 448 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 449 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 450 | chand->resolver = NULL; |
| 451 | if (!chand->started_resolving) { |
| 452 | grpc_closure_list_fail_all(&chand->waiting_for_config_closures, |
| 453 | GRPC_ERROR_REF(op->disconnect_with_error)); |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 454 | grpc_exec_ctx_enqueue_list(exec_ctx, |
| 455 | &chand->waiting_for_config_closures, NULL); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 456 | } |
| 457 | if (chand->lb_policy != NULL) { |
| 458 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 459 | chand->lb_policy->interested_parties, |
| 460 | chand->interested_parties); |
| 461 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 462 | chand->lb_policy = NULL; |
| 463 | } |
Craig Tiller | b12d22a | 2016-04-23 12:50:21 -0700 | [diff] [blame] | 464 | } |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 465 | GRPC_ERROR_UNREF(op->disconnect_with_error); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 466 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 467 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 468 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 469 | |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 470 | static void cc_get_channel_info(grpc_exec_ctx *exec_ctx, |
| 471 | grpc_channel_element *elem, |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 472 | const grpc_channel_info *info) { |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 473 | channel_data *chand = elem->channel_data; |
| 474 | gpr_mu_lock(&chand->mu); |
| 475 | if (info->lb_policy_name != NULL) { |
| 476 | *info->lb_policy_name = chand->lb_policy_name == NULL |
Mark D. Roth | 78afd77 | 2016-11-04 12:49:49 -0700 | [diff] [blame] | 477 | ? NULL |
| 478 | : gpr_strdup(chand->lb_policy_name); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 479 | } |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 480 | if (info->service_config_json != NULL) { |
| 481 | *info->service_config_json = chand->service_config_json == NULL |
| 482 | ? NULL |
| 483 | : gpr_strdup(chand->service_config_json); |
| 484 | } |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 485 | gpr_mu_unlock(&chand->mu); |
| 486 | } |
| 487 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 488 | /* Constructor for channel_data */ |
| 489 | static void cc_init_channel_elem(grpc_exec_ctx *exec_ctx, |
| 490 | grpc_channel_element *elem, |
| 491 | grpc_channel_element_args *args) { |
| 492 | channel_data *chand = elem->channel_data; |
| 493 | |
| 494 | memset(chand, 0, sizeof(*chand)); |
| 495 | |
| 496 | GPR_ASSERT(args->is_last); |
| 497 | GPR_ASSERT(elem->filter == &grpc_client_channel_filter); |
| 498 | |
| 499 | gpr_mu_init(&chand->mu); |
| 500 | grpc_closure_init(&chand->on_resolver_result_changed, |
| 501 | on_resolver_result_changed, chand); |
| 502 | chand->owning_stack = args->channel_stack; |
| 503 | |
| 504 | grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE, |
| 505 | "client_channel"); |
| 506 | chand->interested_parties = grpc_pollset_set_create(); |
| 507 | } |
| 508 | |
| 509 | /* Destructor for channel_data */ |
| 510 | static void cc_destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| 511 | grpc_channel_element *elem) { |
| 512 | channel_data *chand = elem->channel_data; |
| 513 | |
| 514 | if (chand->resolver != NULL) { |
| 515 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 516 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 517 | } |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 518 | if (chand->client_channel_factory != NULL) { |
| 519 | grpc_client_channel_factory_unref(exec_ctx, chand->client_channel_factory); |
| 520 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 521 | if (chand->lb_policy != NULL) { |
| 522 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 523 | chand->lb_policy->interested_parties, |
| 524 | chand->interested_parties); |
| 525 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 526 | } |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 527 | gpr_free(chand->lb_policy_name); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame^] | 528 | gpr_free(chand->service_config_json); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 529 | if (chand->method_params_table != NULL) { |
| 530 | grpc_mdstr_hash_table_unref(chand->method_params_table); |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 531 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 532 | grpc_connectivity_state_destroy(exec_ctx, &chand->state_tracker); |
| 533 | grpc_pollset_set_destroy(chand->interested_parties); |
| 534 | gpr_mu_destroy(&chand->mu); |
| 535 | } |
| 536 | |
| 537 | /************************************************************************* |
| 538 | * PER-CALL FUNCTIONS |
| 539 | */ |
| 540 | |
| 541 | #define GET_CALL(call_data) \ |
| 542 | ((grpc_subchannel_call *)(gpr_atm_acq_load(&(call_data)->subchannel_call))) |
| 543 | |
| 544 | #define CANCELLED_CALL ((grpc_subchannel_call *)1) |
| 545 | |
| 546 | typedef enum { |
| 547 | GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING, |
| 548 | GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL |
| 549 | } subchannel_creation_phase; |
| 550 | |
| 551 | /** Call data. Holds a pointer to grpc_subchannel_call and the |
| 552 | associated machinery to create such a pointer. |
| 553 | Handles queueing of stream ops until a call object is ready, waiting |
| 554 | for initial metadata before trying to create a call object, |
| 555 | and handling cancellation gracefully. */ |
| 556 | typedef struct client_channel_call_data { |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 557 | // State for handling deadlines. |
| 558 | // 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] | 559 | // TODO(roth): This is slightly sub-optimal in that grpc_deadline_state |
| 560 | // and this struct both independently store a pointer to the call |
| 561 | // 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] | 562 | // to avoid this without breaking the grpc_deadline_state abstraction. |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 563 | grpc_deadline_state deadline_state; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 564 | |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 565 | grpc_mdstr *path; // Request path. |
| 566 | gpr_timespec call_start_time; |
| 567 | gpr_timespec deadline; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 568 | wait_for_ready_value wait_for_ready_from_service_config; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 569 | grpc_closure read_service_config; |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 570 | |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 571 | grpc_error *cancel_error; |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 572 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 573 | /** either 0 for no call, 1 for cancelled, or a pointer to a |
| 574 | grpc_subchannel_call */ |
| 575 | gpr_atm subchannel_call; |
| 576 | |
| 577 | gpr_mu mu; |
| 578 | |
| 579 | subchannel_creation_phase creation_phase; |
| 580 | grpc_connected_subchannel *connected_subchannel; |
| 581 | grpc_polling_entity *pollent; |
| 582 | |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 583 | grpc_transport_stream_op **waiting_ops; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 584 | size_t waiting_ops_count; |
| 585 | size_t waiting_ops_capacity; |
| 586 | |
| 587 | grpc_closure next_step; |
| 588 | |
| 589 | grpc_call_stack *owning_call; |
David Garcia Quintas | d1a47f1 | 2016-09-02 12:46:44 +0200 | [diff] [blame] | 590 | |
| 591 | grpc_linked_mdelem lb_token_mdelem; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 592 | } call_data; |
| 593 | |
| 594 | static void add_waiting_locked(call_data *calld, grpc_transport_stream_op *op) { |
| 595 | GPR_TIMER_BEGIN("add_waiting_locked", 0); |
| 596 | if (calld->waiting_ops_count == calld->waiting_ops_capacity) { |
| 597 | calld->waiting_ops_capacity = GPR_MAX(3, 2 * calld->waiting_ops_capacity); |
| 598 | calld->waiting_ops = |
| 599 | gpr_realloc(calld->waiting_ops, |
| 600 | calld->waiting_ops_capacity * sizeof(*calld->waiting_ops)); |
| 601 | } |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 602 | calld->waiting_ops[calld->waiting_ops_count++] = op; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 603 | GPR_TIMER_END("add_waiting_locked", 0); |
| 604 | } |
| 605 | |
| 606 | static void fail_locked(grpc_exec_ctx *exec_ctx, call_data *calld, |
| 607 | grpc_error *error) { |
| 608 | size_t i; |
| 609 | for (i = 0; i < calld->waiting_ops_count; i++) { |
| 610 | grpc_transport_stream_op_finish_with_failure( |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 611 | exec_ctx, calld->waiting_ops[i], GRPC_ERROR_REF(error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 612 | } |
| 613 | calld->waiting_ops_count = 0; |
| 614 | GRPC_ERROR_UNREF(error); |
| 615 | } |
| 616 | |
| 617 | typedef struct { |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 618 | grpc_transport_stream_op **ops; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 619 | size_t nops; |
| 620 | grpc_subchannel_call *call; |
| 621 | } retry_ops_args; |
| 622 | |
| 623 | static void retry_ops(grpc_exec_ctx *exec_ctx, void *args, grpc_error *error) { |
| 624 | retry_ops_args *a = args; |
| 625 | size_t i; |
| 626 | for (i = 0; i < a->nops; i++) { |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 627 | 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] | 628 | } |
| 629 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, a->call, "retry_ops"); |
| 630 | gpr_free(a->ops); |
| 631 | gpr_free(a); |
| 632 | } |
| 633 | |
| 634 | 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] | 635 | if (calld->waiting_ops_count == 0) { |
| 636 | return; |
| 637 | } |
| 638 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 639 | retry_ops_args *a = gpr_malloc(sizeof(*a)); |
| 640 | a->ops = calld->waiting_ops; |
| 641 | a->nops = calld->waiting_ops_count; |
| 642 | a->call = GET_CALL(calld); |
| 643 | if (a->call == CANCELLED_CALL) { |
| 644 | gpr_free(a); |
| 645 | fail_locked(exec_ctx, calld, GRPC_ERROR_CANCELLED); |
| 646 | return; |
| 647 | } |
| 648 | calld->waiting_ops = NULL; |
| 649 | calld->waiting_ops_count = 0; |
| 650 | calld->waiting_ops_capacity = 0; |
| 651 | GRPC_SUBCHANNEL_CALL_REF(a->call, "retry_ops"); |
| 652 | grpc_exec_ctx_sched(exec_ctx, grpc_closure_create(retry_ops, a), |
| 653 | GRPC_ERROR_NONE, NULL); |
| 654 | } |
| 655 | |
| 656 | static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *arg, |
| 657 | grpc_error *error) { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 658 | grpc_call_element *elem = arg; |
| 659 | call_data *calld = elem->call_data; |
| 660 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 661 | gpr_mu_lock(&calld->mu); |
| 662 | GPR_ASSERT(calld->creation_phase == |
| 663 | GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL); |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 664 | grpc_polling_entity_del_from_pollset_set(exec_ctx, calld->pollent, |
| 665 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 666 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 667 | if (calld->connected_subchannel == NULL) { |
| 668 | gpr_atm_no_barrier_store(&calld->subchannel_call, 1); |
| 669 | fail_locked(exec_ctx, calld, GRPC_ERROR_CREATE_REFERENCING( |
| 670 | "Failed to create subchannel", &error, 1)); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 671 | } else if (GET_CALL(calld) == CANCELLED_CALL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 672 | /* already cancelled before subchannel became ready */ |
| 673 | fail_locked(exec_ctx, calld, |
| 674 | GRPC_ERROR_CREATE_REFERENCING( |
| 675 | "Cancelled before creating subchannel", &error, 1)); |
| 676 | } else { |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 677 | /* Create call on subchannel. */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 678 | grpc_subchannel_call *subchannel_call = NULL; |
| 679 | grpc_error *new_error = grpc_connected_subchannel_create_call( |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 680 | exec_ctx, calld->connected_subchannel, calld->pollent, calld->path, |
| 681 | calld->deadline, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 682 | if (new_error != GRPC_ERROR_NONE) { |
| 683 | new_error = grpc_error_add_child(new_error, error); |
| 684 | subchannel_call = CANCELLED_CALL; |
| 685 | fail_locked(exec_ctx, calld, new_error); |
| 686 | } |
| 687 | gpr_atm_rel_store(&calld->subchannel_call, |
| 688 | (gpr_atm)(uintptr_t)subchannel_call); |
| 689 | retry_waiting_locked(exec_ctx, calld); |
| 690 | } |
| 691 | gpr_mu_unlock(&calld->mu); |
| 692 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
| 693 | } |
| 694 | |
| 695 | static char *cc_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) { |
| 696 | call_data *calld = elem->call_data; |
| 697 | grpc_subchannel_call *subchannel_call = GET_CALL(calld); |
| 698 | if (subchannel_call == NULL || subchannel_call == CANCELLED_CALL) { |
| 699 | return NULL; |
| 700 | } else { |
| 701 | return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call); |
| 702 | } |
| 703 | } |
| 704 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 705 | typedef struct { |
| 706 | grpc_metadata_batch *initial_metadata; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 707 | uint32_t initial_metadata_flags; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 708 | grpc_connected_subchannel **connected_subchannel; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 709 | grpc_closure *on_ready; |
| 710 | grpc_call_element *elem; |
| 711 | grpc_closure closure; |
| 712 | } continue_picking_args; |
| 713 | |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 714 | /** Return true if subchannel is available immediately (in which case on_ready |
| 715 | should not be called), or false otherwise (in which case on_ready should be |
| 716 | called when the subchannel is available). */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 717 | static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 718 | grpc_metadata_batch *initial_metadata, |
| 719 | uint32_t initial_metadata_flags, |
| 720 | grpc_connected_subchannel **connected_subchannel, |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 721 | grpc_closure *on_ready, grpc_error *error); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 722 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 723 | static void continue_picking(grpc_exec_ctx *exec_ctx, void *arg, |
| 724 | grpc_error *error) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 725 | continue_picking_args *cpa = arg; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 726 | if (cpa->connected_subchannel == NULL) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 727 | /* cancelled, do nothing */ |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 728 | } else if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 729 | 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] | 730 | } else { |
| 731 | call_data *calld = cpa->elem->call_data; |
| 732 | gpr_mu_lock(&calld->mu); |
| 733 | if (pick_subchannel(exec_ctx, cpa->elem, cpa->initial_metadata, |
Mark D. Roth | fd2ddd2 | 2016-10-07 10:11:10 -0700 | [diff] [blame] | 734 | cpa->initial_metadata_flags, cpa->connected_subchannel, |
| 735 | cpa->on_ready, GRPC_ERROR_NONE)) { |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 736 | grpc_exec_ctx_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_NONE, NULL); |
| 737 | } |
| 738 | gpr_mu_unlock(&calld->mu); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 739 | } |
| 740 | gpr_free(cpa); |
| 741 | } |
| 742 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 743 | static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 744 | grpc_metadata_batch *initial_metadata, |
| 745 | uint32_t initial_metadata_flags, |
| 746 | grpc_connected_subchannel **connected_subchannel, |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 747 | grpc_closure *on_ready, grpc_error *error) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 748 | GPR_TIMER_BEGIN("pick_subchannel", 0); |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 749 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 750 | channel_data *chand = elem->channel_data; |
| 751 | call_data *calld = elem->call_data; |
| 752 | continue_picking_args *cpa; |
| 753 | grpc_closure *closure; |
| 754 | |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 755 | GPR_ASSERT(connected_subchannel); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 756 | |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 757 | gpr_mu_lock(&chand->mu); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 758 | if (initial_metadata == NULL) { |
| 759 | if (chand->lb_policy != NULL) { |
Craig Tiller | ab33b48 | 2015-11-21 08:11:04 -0800 | [diff] [blame] | 760 | grpc_lb_policy_cancel_pick(exec_ctx, chand->lb_policy, |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 761 | connected_subchannel, GRPC_ERROR_REF(error)); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 762 | } |
| 763 | for (closure = chand->waiting_for_config_closures.head; closure != NULL; |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 764 | closure = closure->next_data.next) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 765 | cpa = closure->cb_arg; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 766 | if (cpa->connected_subchannel == connected_subchannel) { |
| 767 | cpa->connected_subchannel = NULL; |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 768 | grpc_exec_ctx_sched( |
| 769 | exec_ctx, cpa->on_ready, |
| 770 | GRPC_ERROR_CREATE_REFERENCING("Pick cancelled", &error, 1), NULL); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 771 | } |
| 772 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 773 | gpr_mu_unlock(&chand->mu); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 774 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 697a1f6 | 2016-09-07 13:35:07 -0700 | [diff] [blame] | 775 | GRPC_ERROR_UNREF(error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 776 | return true; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 777 | } |
Mark D. Roth | 697a1f6 | 2016-09-07 13:35:07 -0700 | [diff] [blame] | 778 | GPR_ASSERT(error == GRPC_ERROR_NONE); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 779 | if (chand->lb_policy != NULL) { |
Craig Tiller | 86c0f8a | 2015-12-01 20:05:40 -0800 | [diff] [blame] | 780 | grpc_lb_policy *lb_policy = chand->lb_policy; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 781 | GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel"); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 782 | gpr_mu_unlock(&chand->mu); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 783 | // If the application explicitly set wait_for_ready, use that. |
| 784 | // Otherwise, if the service config specified a value for this |
| 785 | // method, use that. |
Mark D. Roth | c1c3858 | 2016-10-11 11:03:27 -0700 | [diff] [blame] | 786 | const bool wait_for_ready_set_from_api = |
| 787 | initial_metadata_flags & |
| 788 | GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET; |
| 789 | const bool wait_for_ready_set_from_service_config = |
| 790 | calld->wait_for_ready_from_service_config != WAIT_FOR_READY_UNSET; |
| 791 | if (!wait_for_ready_set_from_api && |
| 792 | wait_for_ready_set_from_service_config) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 793 | if (calld->wait_for_ready_from_service_config == WAIT_FOR_READY_TRUE) { |
| 794 | initial_metadata_flags |= GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 795 | } else { |
| 796 | initial_metadata_flags &= ~GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 797 | } |
| 798 | } |
David Garcia Quintas | 61c5801 | 2016-10-03 14:44:20 -0700 | [diff] [blame] | 799 | // TODO(dgq): make this deadline configurable somehow. |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 800 | const grpc_lb_policy_pick_args inputs = { |
Yuchen Zeng | ac8bc42 | 2016-10-05 14:00:02 -0700 | [diff] [blame] | 801 | initial_metadata, initial_metadata_flags, &calld->lb_token_mdelem, |
| 802 | gpr_inf_future(GPR_CLOCK_MONOTONIC)}; |
Mark D. Roth | 55f25b6 | 2016-10-12 14:55:20 -0700 | [diff] [blame] | 803 | const bool result = grpc_lb_policy_pick( |
| 804 | exec_ctx, lb_policy, &inputs, connected_subchannel, NULL, on_ready); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 805 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "pick_subchannel"); |
| 806 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 807 | return result; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 808 | } |
| 809 | if (chand->resolver != NULL && !chand->started_resolving) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 810 | chand->started_resolving = true; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 811 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 812 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 813 | &chand->on_resolver_result_changed); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 814 | } |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 815 | if (chand->resolver != NULL) { |
| 816 | cpa = gpr_malloc(sizeof(*cpa)); |
| 817 | cpa->initial_metadata = initial_metadata; |
| 818 | cpa->initial_metadata_flags = initial_metadata_flags; |
| 819 | cpa->connected_subchannel = connected_subchannel; |
| 820 | cpa->on_ready = on_ready; |
| 821 | cpa->elem = elem; |
| 822 | grpc_closure_init(&cpa->closure, continue_picking, cpa); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 823 | grpc_closure_list_append(&chand->waiting_for_config_closures, &cpa->closure, |
| 824 | GRPC_ERROR_NONE); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 825 | } else { |
Craig Tiller | 332f1b3 | 2016-05-24 13:21:21 -0700 | [diff] [blame] | 826 | grpc_exec_ctx_sched(exec_ctx, on_ready, GRPC_ERROR_CREATE("Disconnected"), |
| 827 | NULL); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 828 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 829 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 830 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 831 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 832 | return false; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 833 | } |
| 834 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 835 | // The logic here is fairly complicated, due to (a) the fact that we |
| 836 | // need to handle the case where we receive the send op before the |
| 837 | // initial metadata op, and (b) the need for efficiency, especially in |
| 838 | // the streaming case. |
| 839 | // TODO(ctiller): Explain this more thoroughly. |
| 840 | static void cc_start_transport_stream_op(grpc_exec_ctx *exec_ctx, |
| 841 | grpc_call_element *elem, |
| 842 | grpc_transport_stream_op *op) { |
| 843 | call_data *calld = elem->call_data; |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 844 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 845 | GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 846 | 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] | 847 | /* try to (atomically) get the call */ |
| 848 | grpc_subchannel_call *call = GET_CALL(calld); |
| 849 | GPR_TIMER_BEGIN("cc_start_transport_stream_op", 0); |
| 850 | if (call == CANCELLED_CALL) { |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 851 | grpc_transport_stream_op_finish_with_failure( |
| 852 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 853 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 854 | return; |
| 855 | } |
| 856 | if (call != NULL) { |
| 857 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
| 858 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 859 | return; |
| 860 | } |
| 861 | /* we failed; lock and figure out what to do */ |
| 862 | gpr_mu_lock(&calld->mu); |
| 863 | retry: |
| 864 | /* need to recheck that another thread hasn't set the call */ |
| 865 | call = GET_CALL(calld); |
| 866 | if (call == CANCELLED_CALL) { |
| 867 | gpr_mu_unlock(&calld->mu); |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 868 | grpc_transport_stream_op_finish_with_failure( |
| 869 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 870 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 871 | return; |
| 872 | } |
| 873 | if (call != NULL) { |
| 874 | gpr_mu_unlock(&calld->mu); |
| 875 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
| 876 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 877 | return; |
| 878 | } |
| 879 | /* if this is a cancellation, then we can raise our cancelled flag */ |
| 880 | if (op->cancel_error != GRPC_ERROR_NONE) { |
| 881 | if (!gpr_atm_rel_cas(&calld->subchannel_call, 0, |
| 882 | (gpr_atm)(uintptr_t)CANCELLED_CALL)) { |
| 883 | goto retry; |
| 884 | } else { |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 885 | // Stash a copy of cancel_error in our call data, so that we can use |
| 886 | // it for subsequent operations. This ensures that if the call is |
| 887 | // cancelled before any ops are passed down (e.g., if the deadline |
| 888 | // is in the past when the call starts), we can return the right |
| 889 | // error to the caller when the first op does get passed down. |
| 890 | calld->cancel_error = GRPC_ERROR_REF(op->cancel_error); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 891 | switch (calld->creation_phase) { |
| 892 | case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING: |
| 893 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(op->cancel_error)); |
| 894 | break; |
| 895 | case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL: |
Mark D. Roth | d4c0f55 | 2016-09-01 09:25:32 -0700 | [diff] [blame] | 896 | pick_subchannel(exec_ctx, elem, NULL, 0, &calld->connected_subchannel, |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 897 | NULL, GRPC_ERROR_REF(op->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 898 | break; |
| 899 | } |
| 900 | gpr_mu_unlock(&calld->mu); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 901 | grpc_transport_stream_op_finish_with_failure( |
| 902 | exec_ctx, op, GRPC_ERROR_REF(op->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 903 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 904 | return; |
| 905 | } |
| 906 | } |
| 907 | /* if we don't have a subchannel, try to get one */ |
| 908 | if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && |
| 909 | calld->connected_subchannel == NULL && |
| 910 | op->send_initial_metadata != NULL) { |
| 911 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL; |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 912 | grpc_closure_init(&calld->next_step, subchannel_ready, elem); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 913 | GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel"); |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 914 | /* If a subchannel is not available immediately, the polling entity from |
| 915 | call_data should be provided to channel_data's interested_parties, so |
| 916 | 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] | 917 | if (pick_subchannel(exec_ctx, elem, op->send_initial_metadata, |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 918 | op->send_initial_metadata_flags, |
| 919 | &calld->connected_subchannel, &calld->next_step, |
| 920 | GRPC_ERROR_NONE)) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 921 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 922 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 923 | } else { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 924 | grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent, |
| 925 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
| 928 | /* if we've got a subchannel, then let's ask it to create a call */ |
| 929 | if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && |
| 930 | calld->connected_subchannel != NULL) { |
| 931 | grpc_subchannel_call *subchannel_call = NULL; |
| 932 | grpc_error *error = grpc_connected_subchannel_create_call( |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 933 | exec_ctx, calld->connected_subchannel, calld->pollent, calld->path, |
| 934 | calld->deadline, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 935 | if (error != GRPC_ERROR_NONE) { |
| 936 | subchannel_call = CANCELLED_CALL; |
| 937 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(error)); |
| 938 | grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error); |
| 939 | } |
| 940 | gpr_atm_rel_store(&calld->subchannel_call, |
| 941 | (gpr_atm)(uintptr_t)subchannel_call); |
| 942 | retry_waiting_locked(exec_ctx, calld); |
| 943 | goto retry; |
| 944 | } |
| 945 | /* nothing to be done but wait */ |
| 946 | add_waiting_locked(calld, op); |
| 947 | gpr_mu_unlock(&calld->mu); |
| 948 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
| 949 | } |
| 950 | |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 951 | // Gets data from the service config. Invoked when the resolver returns |
| 952 | // its initial result. |
| 953 | static void read_service_config(grpc_exec_ctx *exec_ctx, void *arg, |
| 954 | grpc_error *error) { |
| 955 | grpc_call_element *elem = arg; |
| 956 | channel_data *chand = elem->channel_data; |
| 957 | call_data *calld = elem->call_data; |
| 958 | // 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] | 959 | if (error == GRPC_ERROR_NONE) { |
| 960 | // Get the method config table from channel data. |
| 961 | gpr_mu_lock(&chand->mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 962 | grpc_mdstr_hash_table *method_params_table = NULL; |
| 963 | if (chand->method_params_table != NULL) { |
| 964 | method_params_table = |
| 965 | grpc_mdstr_hash_table_ref(chand->method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 966 | } |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 967 | gpr_mu_unlock(&chand->mu); |
| 968 | // If the method config table was present, use it. |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 969 | if (method_params_table != NULL) { |
| 970 | const method_parameters *method_params = |
| 971 | grpc_method_config_table_get(method_params_table, calld->path); |
| 972 | if (method_params != NULL) { |
| 973 | const bool have_method_timeout = |
| 974 | gpr_time_cmp(method_params->timeout, gpr_time_0(GPR_TIMESPAN)) != 0; |
| 975 | if (have_method_timeout || |
| 976 | method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 977 | gpr_mu_lock(&calld->mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 978 | if (have_method_timeout) { |
| 979 | const gpr_timespec per_method_deadline = |
| 980 | gpr_time_add(calld->call_start_time, method_params->timeout); |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 981 | if (gpr_time_cmp(per_method_deadline, calld->deadline) < 0) { |
| 982 | calld->deadline = per_method_deadline; |
| 983 | // Reset deadline timer. |
| 984 | grpc_deadline_state_reset(exec_ctx, elem, calld->deadline); |
| 985 | } |
| 986 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 987 | if (method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 988 | calld->wait_for_ready_from_service_config = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 989 | method_params->wait_for_ready; |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 990 | } |
| 991 | gpr_mu_unlock(&calld->mu); |
| 992 | } |
| 993 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 994 | grpc_mdstr_hash_table_unref(method_params_table); |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 995 | } |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 996 | } |
Mark D. Roth | 31292f2 | 2016-10-12 13:14:07 -0700 | [diff] [blame] | 997 | 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] | 998 | } |
| 999 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1000 | /* Constructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1001 | static grpc_error *cc_init_call_elem(grpc_exec_ctx *exec_ctx, |
| 1002 | grpc_call_element *elem, |
| 1003 | grpc_call_element_args *args) { |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 1004 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1005 | call_data *calld = elem->call_data; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1006 | // Initialize data members. |
| 1007 | grpc_deadline_state_init(exec_ctx, elem, args->call_stack); |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 1008 | calld->path = GRPC_MDSTR_REF(args->path); |
Mark D. Roth | ff08f33 | 2016-10-14 13:01:01 -0700 | [diff] [blame] | 1009 | calld->call_start_time = args->start_time; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1010 | calld->deadline = gpr_convert_clock_type(args->deadline, GPR_CLOCK_MONOTONIC); |
| 1011 | calld->wait_for_ready_from_service_config = WAIT_FOR_READY_UNSET; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1012 | calld->cancel_error = GRPC_ERROR_NONE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1013 | gpr_atm_rel_store(&calld->subchannel_call, 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1014 | gpr_mu_init(&calld->mu); |
| 1015 | calld->connected_subchannel = NULL; |
| 1016 | calld->waiting_ops = NULL; |
| 1017 | calld->waiting_ops_count = 0; |
| 1018 | calld->waiting_ops_capacity = 0; |
| 1019 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 1020 | calld->owning_call = args->call_stack; |
| 1021 | calld->pollent = NULL; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1022 | // If the resolver has already returned results, then we can access |
| 1023 | // the service config parameters immediately. Otherwise, we need to |
| 1024 | // defer that work until the resolver returns an initial result. |
| 1025 | // TODO(roth): This code is almost but not quite identical to the code |
| 1026 | // in read_service_config() above. It would be nice to find a way to |
| 1027 | // combine them, to avoid having to maintain it twice. |
| 1028 | gpr_mu_lock(&chand->mu); |
| 1029 | if (chand->lb_policy != NULL) { |
| 1030 | // We already have a resolver result, so check for service config. |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1031 | if (chand->method_params_table != NULL) { |
| 1032 | grpc_mdstr_hash_table *method_params_table = |
| 1033 | grpc_mdstr_hash_table_ref(chand->method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1034 | gpr_mu_unlock(&chand->mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1035 | method_parameters *method_params = |
| 1036 | grpc_method_config_table_get(method_params_table, args->path); |
| 1037 | if (method_params != NULL) { |
| 1038 | if (gpr_time_cmp(method_params->timeout, |
| 1039 | gpr_time_0(GPR_CLOCK_MONOTONIC)) != 0) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1040 | gpr_timespec per_method_deadline = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1041 | gpr_time_add(calld->call_start_time, method_params->timeout); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1042 | calld->deadline = gpr_time_min(calld->deadline, per_method_deadline); |
| 1043 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1044 | if (method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1045 | calld->wait_for_ready_from_service_config = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1046 | method_params->wait_for_ready; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1047 | } |
| 1048 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1049 | grpc_mdstr_hash_table_unref(method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1050 | } else { |
| 1051 | gpr_mu_unlock(&chand->mu); |
| 1052 | } |
| 1053 | } else { |
| 1054 | // We don't yet have a resolver result, so register a callback to |
| 1055 | // get the service config data once the resolver returns. |
Mark D. Roth | 31292f2 | 2016-10-12 13:14:07 -0700 | [diff] [blame] | 1056 | // Take a reference to the call stack to be owned by the callback. |
| 1057 | GRPC_CALL_STACK_REF(calld->owning_call, "read_service_config"); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1058 | grpc_closure_init(&calld->read_service_config, read_service_config, elem); |
| 1059 | grpc_closure_list_append(&chand->waiting_for_config_closures, |
| 1060 | &calld->read_service_config, GRPC_ERROR_NONE); |
| 1061 | gpr_mu_unlock(&chand->mu); |
| 1062 | } |
| 1063 | // Start the deadline timer with the current deadline value. If we |
| 1064 | // do not yet have service config data, then the timer may be reset |
| 1065 | // later. |
| 1066 | grpc_deadline_state_start(exec_ctx, elem, calld->deadline); |
Mark D. Roth | 0badbe8 | 2016-06-23 10:15:12 -0700 | [diff] [blame] | 1067 | return GRPC_ERROR_NONE; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1068 | } |
| 1069 | |
| 1070 | /* Destructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1071 | static void cc_destroy_call_elem(grpc_exec_ctx *exec_ctx, |
| 1072 | grpc_call_element *elem, |
| 1073 | const grpc_call_final_info *final_info, |
| 1074 | void *and_free_memory) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1075 | call_data *calld = elem->call_data; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1076 | grpc_deadline_state_destroy(exec_ctx, elem); |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 1077 | GRPC_MDSTR_UNREF(calld->path); |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1078 | GRPC_ERROR_UNREF(calld->cancel_error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1079 | grpc_subchannel_call *call = GET_CALL(calld); |
| 1080 | if (call != NULL && call != CANCELLED_CALL) { |
| 1081 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "client_channel_destroy_call"); |
| 1082 | } |
| 1083 | GPR_ASSERT(calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING); |
| 1084 | gpr_mu_destroy(&calld->mu); |
| 1085 | GPR_ASSERT(calld->waiting_ops_count == 0); |
Craig Tiller | 693d394 | 2016-10-27 16:51:25 -0700 | [diff] [blame] | 1086 | if (calld->connected_subchannel != NULL) { |
| 1087 | GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, calld->connected_subchannel, |
| 1088 | "picked"); |
| 1089 | } |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1090 | gpr_free(calld->waiting_ops); |
Craig Tiller | 2c8063c | 2016-03-22 22:12:15 -0700 | [diff] [blame] | 1091 | gpr_free(and_free_memory); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1092 | } |
| 1093 | |
David Garcia Quintas | f72eb97 | 2016-05-03 18:28:09 -0700 | [diff] [blame] | 1094 | static void cc_set_pollset_or_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1095 | grpc_call_element *elem, |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1096 | grpc_polling_entity *pollent) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1097 | call_data *calld = elem->call_data; |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1098 | calld->pollent = pollent; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1099 | } |
| 1100 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1101 | /************************************************************************* |
| 1102 | * EXPORTED SYMBOLS |
| 1103 | */ |
| 1104 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1105 | const grpc_channel_filter grpc_client_channel_filter = { |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1106 | cc_start_transport_stream_op, |
| 1107 | cc_start_transport_op, |
| 1108 | sizeof(call_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1109 | cc_init_call_elem, |
David Garcia Quintas | 4afce7e | 2016-04-18 16:25:17 -0700 | [diff] [blame] | 1110 | cc_set_pollset_or_pollset_set, |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1111 | cc_destroy_call_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1112 | sizeof(channel_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1113 | cc_init_channel_elem, |
| 1114 | cc_destroy_channel_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1115 | cc_get_peer, |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 1116 | cc_get_channel_info, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1117 | "client-channel", |
Craig Tiller | 87d5b19 | 2015-04-16 14:37:57 -0700 | [diff] [blame] | 1118 | }; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1119 | |
Mark D. Roth | 6053497 | 2016-09-20 08:37:12 -0700 | [diff] [blame] | 1120 | void grpc_client_channel_finish_initialization( |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 1121 | grpc_exec_ctx *exec_ctx, grpc_channel_stack *channel_stack, |
| 1122 | grpc_resolver *resolver, |
| 1123 | grpc_client_channel_factory *client_channel_factory) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1124 | /* post construction initialization: set the transport setup pointer */ |
Mark D. Roth | 7f7d165 | 2016-09-20 10:46:15 -0700 | [diff] [blame] | 1125 | GPR_ASSERT(client_channel_factory != NULL); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1126 | grpc_channel_element *elem = grpc_channel_stack_last_element(channel_stack); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1127 | channel_data *chand = elem->channel_data; |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1128 | gpr_mu_lock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1129 | GPR_ASSERT(!chand->resolver); |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 1130 | chand->resolver = resolver; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1131 | GRPC_RESOLVER_REF(resolver, "channel"); |
| 1132 | if (!grpc_closure_list_empty(chand->waiting_for_config_closures) || |
| 1133 | chand->exit_idle_when_lb_policy_arrives) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1134 | chand->started_resolving = true; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1135 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 1136 | grpc_resolver_next(exec_ctx, resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1137 | &chand->on_resolver_result_changed); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1138 | } |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 1139 | chand->client_channel_factory = client_channel_factory; |
| 1140 | grpc_client_channel_factory_ref(client_channel_factory); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1141 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | 190d360 | 2015-02-18 09:23:38 -0800 | [diff] [blame] | 1142 | } |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1143 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1144 | grpc_connectivity_state grpc_client_channel_check_connectivity_state( |
| 1145 | 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] | 1146 | channel_data *chand = elem->channel_data; |
| 1147 | grpc_connectivity_state out; |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1148 | gpr_mu_lock(&chand->mu); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 1149 | out = grpc_connectivity_state_check(&chand->state_tracker, NULL); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1150 | if (out == GRPC_CHANNEL_IDLE && try_to_connect) { |
| 1151 | if (chand->lb_policy != NULL) { |
| 1152 | grpc_lb_policy_exit_idle(exec_ctx, chand->lb_policy); |
| 1153 | } else { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1154 | chand->exit_idle_when_lb_policy_arrives = true; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1155 | if (!chand->started_resolving && chand->resolver != NULL) { |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1156 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1157 | chand->started_resolving = true; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 1158 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1159 | &chand->on_resolver_result_changed); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1160 | } |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1161 | } |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1162 | } |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1163 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1164 | return out; |
| 1165 | } |
| 1166 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1167 | typedef struct { |
| 1168 | channel_data *chand; |
| 1169 | grpc_pollset *pollset; |
| 1170 | grpc_closure *on_complete; |
| 1171 | grpc_closure my_closure; |
| 1172 | } external_connectivity_watcher; |
| 1173 | |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1174 | 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] | 1175 | grpc_error *error) { |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1176 | external_connectivity_watcher *w = arg; |
| 1177 | grpc_closure *follow_up = w->on_complete; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1178 | grpc_pollset_set_del_pollset(exec_ctx, w->chand->interested_parties, |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1179 | w->pollset); |
| 1180 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, |
| 1181 | "external_connectivity_watcher"); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1182 | gpr_free(w); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 1183 | follow_up->cb(exec_ctx, follow_up->cb_arg, error); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1184 | } |
| 1185 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1186 | void grpc_client_channel_watch_connectivity_state( |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1187 | grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, grpc_pollset *pollset, |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1188 | grpc_connectivity_state *state, grpc_closure *on_complete) { |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1189 | channel_data *chand = elem->channel_data; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1190 | external_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
| 1191 | w->chand = chand; |
| 1192 | w->pollset = pollset; |
| 1193 | w->on_complete = on_complete; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1194 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, pollset); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1195 | grpc_closure_init(&w->my_closure, on_external_watch_complete, w); |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1196 | GRPC_CHANNEL_STACK_REF(w->chand->owning_stack, |
| 1197 | "external_connectivity_watcher"); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1198 | gpr_mu_lock(&chand->mu); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1199 | grpc_connectivity_state_notify_on_state_change( |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1200 | exec_ctx, &chand->state_tracker, state, &w->my_closure); |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 1201 | gpr_mu_unlock(&chand->mu); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1202 | } |