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 | d58a985 | 2017-01-18 08:28:57 -0800 | [diff] [blame] | 46 | #include "src/core/ext/client_channel/http_connect_handshaker.h" |
Mark D. Roth | 1519574 | 2016-10-07 09:02:28 -0700 | [diff] [blame] | 47 | #include "src/core/ext/client_channel/lb_policy_registry.h" |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 48 | #include "src/core/ext/client_channel/proxy_mapper_registry.h" |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 49 | #include "src/core/ext/client_channel/resolver_registry.h" |
Mark D. Roth | 2137cd8 | 2016-09-14 09:04:00 -0700 | [diff] [blame] | 50 | #include "src/core/ext/client_channel/subchannel.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 51 | #include "src/core/lib/channel/channel_args.h" |
| 52 | #include "src/core/lib/channel/connected_channel.h" |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 53 | #include "src/core/lib/channel/deadline_filter.h" |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 54 | #include "src/core/lib/iomgr/combiner.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 55 | #include "src/core/lib/iomgr/iomgr.h" |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 56 | #include "src/core/lib/iomgr/polling_entity.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 57 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 58 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 59 | #include "src/core/lib/support/string.h" |
| 60 | #include "src/core/lib/surface/channel.h" |
| 61 | #include "src/core/lib/transport/connectivity_state.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 62 | #include "src/core/lib/transport/metadata.h" |
| 63 | #include "src/core/lib/transport/metadata_batch.h" |
Mark D. Roth | ea846a0 | 2016-11-03 11:32:54 -0700 | [diff] [blame] | 64 | #include "src/core/lib/transport/service_config.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 65 | #include "src/core/lib/transport/static_metadata.h" |
Craig Tiller | 8910ac6 | 2015-10-08 16:49:15 -0700 | [diff] [blame] | 66 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 67 | /* Client channel implementation */ |
| 68 | |
Mark D. Roth | 26b7be4 | 2016-10-24 10:08:07 -0700 | [diff] [blame] | 69 | /************************************************************************* |
| 70 | * METHOD-CONFIG TABLE |
| 71 | */ |
| 72 | |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 73 | typedef enum { |
| 74 | WAIT_FOR_READY_UNSET, |
| 75 | WAIT_FOR_READY_FALSE, |
| 76 | WAIT_FOR_READY_TRUE |
| 77 | } wait_for_ready_value; |
| 78 | |
| 79 | typedef struct method_parameters { |
| 80 | gpr_timespec timeout; |
| 81 | wait_for_ready_value wait_for_ready; |
| 82 | } method_parameters; |
| 83 | |
| 84 | static void *method_parameters_copy(void *value) { |
| 85 | void *new_value = gpr_malloc(sizeof(method_parameters)); |
| 86 | memcpy(new_value, value, sizeof(method_parameters)); |
| 87 | return new_value; |
| 88 | } |
| 89 | |
Craig Tiller | b28c7e8 | 2016-11-18 10:29:04 -0800 | [diff] [blame] | 90 | static void method_parameters_free(grpc_exec_ctx *exec_ctx, void *p) { |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 91 | gpr_free(p); |
| 92 | } |
| 93 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 94 | static const grpc_slice_hash_table_vtable method_parameters_vtable = { |
Craig Tiller | b28c7e8 | 2016-11-18 10:29:04 -0800 | [diff] [blame] | 95 | method_parameters_free, method_parameters_copy}; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 96 | |
Mark D. Roth | e30baeb | 2016-11-03 08:16:19 -0700 | [diff] [blame] | 97 | static void *method_parameters_create_from_json(const grpc_json *json) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 98 | wait_for_ready_value wait_for_ready = WAIT_FOR_READY_UNSET; |
Mark D. Roth | 47f1084 | 2016-11-03 08:45:27 -0700 | [diff] [blame] | 99 | gpr_timespec timeout = {0, 0, GPR_TIMESPAN}; |
| 100 | for (grpc_json *field = json->child; field != NULL; field = field->next) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 101 | if (field->key == NULL) continue; |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 102 | if (strcmp(field->key, "waitForReady") == 0) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 103 | if (wait_for_ready != WAIT_FOR_READY_UNSET) return NULL; // Duplicate. |
| 104 | if (field->type != GRPC_JSON_TRUE && field->type != GRPC_JSON_FALSE) { |
| 105 | return NULL; |
| 106 | } |
Mark D. Roth | 47f1084 | 2016-11-03 08:45:27 -0700 | [diff] [blame] | 107 | wait_for_ready = field->type == GRPC_JSON_TRUE ? WAIT_FOR_READY_TRUE |
| 108 | : WAIT_FOR_READY_FALSE; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 109 | } else if (strcmp(field->key, "timeout") == 0) { |
| 110 | if (timeout.tv_sec > 0 || timeout.tv_nsec > 0) return NULL; // Duplicate. |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 111 | if (field->type != GRPC_JSON_STRING) return NULL; |
| 112 | size_t len = strlen(field->value); |
| 113 | if (field->value[len - 1] != 's') return NULL; |
Mark D. Roth | c19049c | 2016-11-10 09:43:06 -0800 | [diff] [blame] | 114 | char *buf = gpr_strdup(field->value); |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 115 | buf[len - 1] = '\0'; // Remove trailing 's'. |
Mark D. Roth | c19049c | 2016-11-10 09:43:06 -0800 | [diff] [blame] | 116 | char *decimal_point = strchr(buf, '.'); |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 117 | if (decimal_point != NULL) { |
| 118 | *decimal_point = '\0'; |
| 119 | timeout.tv_nsec = gpr_parse_nonnegative_int(decimal_point + 1); |
| 120 | if (timeout.tv_nsec == -1) { |
| 121 | gpr_free(buf); |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 122 | return NULL; |
| 123 | } |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 124 | // There should always be exactly 3, 6, or 9 fractional digits. |
| 125 | int multiplier = 1; |
| 126 | switch (strlen(decimal_point + 1)) { |
| 127 | case 9: |
| 128 | break; |
| 129 | case 6: |
| 130 | multiplier *= 1000; |
| 131 | break; |
| 132 | case 3: |
| 133 | multiplier *= 1000000; |
| 134 | break; |
| 135 | default: // Unsupported number of digits. |
| 136 | gpr_free(buf); |
| 137 | return NULL; |
| 138 | } |
| 139 | timeout.tv_nsec *= multiplier; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 140 | } |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 141 | timeout.tv_sec = gpr_parse_nonnegative_int(buf); |
| 142 | if (timeout.tv_sec == -1) return NULL; |
| 143 | gpr_free(buf); |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 144 | } |
| 145 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 146 | method_parameters *value = gpr_malloc(sizeof(method_parameters)); |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 147 | value->timeout = timeout; |
| 148 | value->wait_for_ready = wait_for_ready; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 149 | return value; |
| 150 | } |
| 151 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 152 | /************************************************************************* |
| 153 | * CHANNEL-WIDE FUNCTIONS |
| 154 | */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 155 | |
Craig Tiller | 800dacb | 2015-10-06 09:10:26 -0700 | [diff] [blame] | 156 | typedef struct client_channel_channel_data { |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 157 | /** resolver for this channel */ |
| 158 | grpc_resolver *resolver; |
Craig Tiller | 20a3c35 | 2015-08-05 08:39:50 -0700 | [diff] [blame] | 159 | /** have we started resolving this channel */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 160 | bool started_resolving; |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 161 | /** client channel factory */ |
| 162 | grpc_client_channel_factory *client_channel_factory; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 163 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 164 | /** combiner protecting all variables below in this data structure */ |
| 165 | grpc_combiner *combiner; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 166 | /** currently active load balancer */ |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 167 | grpc_lb_policy *lb_policy; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 168 | /** maps method names to method_parameters structs */ |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 169 | grpc_slice_hash_table *method_params_table; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 170 | /** incoming resolver result - set by resolver.next() */ |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 171 | grpc_channel_args *resolver_result; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 172 | /** 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] | 173 | grpc_closure_list waiting_for_config_closures; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 174 | /** resolver callback */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 175 | grpc_closure on_resolver_result_changed; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 176 | /** connectivity state being tracked */ |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 177 | grpc_connectivity_state_tracker state_tracker; |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 178 | /** when an lb_policy arrives, should we try to exit idle */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 179 | bool exit_idle_when_lb_policy_arrives; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 180 | /** owning stack */ |
| 181 | grpc_channel_stack *owning_stack; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 182 | /** interested parties (owned) */ |
| 183 | grpc_pollset_set *interested_parties; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 184 | |
| 185 | /* the following properties are guarded by a mutex since API's require them |
| 186 | to be instantaniously available */ |
| 187 | gpr_mu info_mu; |
| 188 | char *info_lb_policy_name; |
| 189 | /** service config in JSON form */ |
| 190 | char *info_service_config_json; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 191 | } channel_data; |
| 192 | |
Craig Tiller | d6c98df | 2015-08-18 09:33:44 -0700 | [diff] [blame] | 193 | /** 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] | 194 | resolver, to watch for state changes from the lb_policy. When a state |
| 195 | change is seen, we update the channel, and create a new watcher. */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 196 | typedef struct { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 197 | channel_data *chand; |
Craig Tiller | 3382511 | 2015-09-18 07:44:19 -0700 | [diff] [blame] | 198 | grpc_closure on_changed; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 199 | grpc_connectivity_state state; |
| 200 | grpc_lb_policy *lb_policy; |
| 201 | } lb_policy_connectivity_watcher; |
| 202 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 203 | static void watch_lb_policy(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 204 | grpc_lb_policy *lb_policy, |
| 205 | grpc_connectivity_state current_state); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 206 | |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 207 | static void set_channel_connectivity_state_locked(grpc_exec_ctx *exec_ctx, |
| 208 | channel_data *chand, |
| 209 | grpc_connectivity_state state, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 210 | grpc_error *error, |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 211 | const char *reason) { |
| 212 | if ((state == GRPC_CHANNEL_TRANSIENT_FAILURE || |
Craig Tiller | 48ed92e | 2016-06-02 11:07:12 -0700 | [diff] [blame] | 213 | state == GRPC_CHANNEL_SHUTDOWN) && |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 214 | chand->lb_policy != NULL) { |
Mark D. Roth | 59c9f90 | 2016-09-28 13:33:21 -0700 | [diff] [blame] | 215 | /* cancel picks with wait_for_ready=false */ |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 216 | grpc_lb_policy_cancel_picks( |
| 217 | exec_ctx, chand->lb_policy, |
Mark D. Roth | 59c9f90 | 2016-09-28 13:33:21 -0700 | [diff] [blame] | 218 | /* mask= */ GRPC_INITIAL_METADATA_WAIT_FOR_READY, |
Mark D. Roth | 58f52b7 | 2016-09-09 13:55:18 -0700 | [diff] [blame] | 219 | /* check= */ 0, GRPC_ERROR_REF(error)); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 220 | } |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 221 | grpc_connectivity_state_set(exec_ctx, &chand->state_tracker, state, error, |
| 222 | reason); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 223 | } |
| 224 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 225 | static void on_lb_policy_state_changed_locked(grpc_exec_ctx *exec_ctx, |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 226 | void *arg, grpc_error *error) { |
| 227 | lb_policy_connectivity_watcher *w = arg; |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 228 | grpc_connectivity_state publish_state = w->state; |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 229 | /* check if the notification is for the latest policy */ |
| 230 | if (w->lb_policy == w->chand->lb_policy) { |
| 231 | if (publish_state == GRPC_CHANNEL_SHUTDOWN && w->chand->resolver != NULL) { |
| 232 | publish_state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
| 233 | grpc_resolver_channel_saw_error(exec_ctx, w->chand->resolver); |
| 234 | GRPC_LB_POLICY_UNREF(exec_ctx, w->chand->lb_policy, "channel"); |
| 235 | w->chand->lb_policy = NULL; |
| 236 | } |
| 237 | set_channel_connectivity_state_locked(exec_ctx, w->chand, publish_state, |
| 238 | GRPC_ERROR_REF(error), "lb_changed"); |
| 239 | if (w->state != GRPC_CHANNEL_SHUTDOWN) { |
| 240 | watch_lb_policy(exec_ctx, w->chand, w->lb_policy, w->state); |
| 241 | } |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 242 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 243 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 244 | 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] | 245 | gpr_free(w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 246 | } |
| 247 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 248 | static void watch_lb_policy(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 249 | grpc_lb_policy *lb_policy, |
| 250 | grpc_connectivity_state current_state) { |
| 251 | lb_policy_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 252 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "watch_lb_policy"); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 253 | |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 254 | w->chand = chand; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 255 | grpc_closure_init(&w->on_changed, on_lb_policy_state_changed_locked, w, |
| 256 | grpc_combiner_scheduler(chand->combiner, false)); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 257 | w->state = current_state; |
| 258 | w->lb_policy = lb_policy; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 259 | grpc_lb_policy_notify_on_state_change(exec_ctx, lb_policy, &w->state, |
| 260 | &w->on_changed); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 261 | } |
| 262 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 263 | static void on_resolver_result_changed_locked(grpc_exec_ctx *exec_ctx, |
| 264 | void *arg, grpc_error *error) { |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 265 | channel_data *chand = arg; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 266 | char *lb_policy_name = NULL; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 267 | grpc_lb_policy *lb_policy = NULL; |
| 268 | grpc_lb_policy *old_lb_policy; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 269 | grpc_slice_hash_table *method_params_table = NULL; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 270 | grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 271 | bool exit_idle = false; |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 272 | grpc_error *state_error = GRPC_ERROR_CREATE("No load balancing policy"); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 273 | char *service_config_json = NULL; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 274 | |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 275 | if (chand->resolver_result != NULL) { |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 276 | // Find LB policy name. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 277 | const grpc_arg *channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 278 | 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] | 279 | if (channel_arg != NULL) { |
| 280 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
| 281 | lb_policy_name = channel_arg->value.string; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 282 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 283 | // Special case: If all of the addresses are balancer addresses, |
| 284 | // assume that we should use the grpclb policy, regardless of what the |
| 285 | // resolver actually specified. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 286 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 287 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_LB_ADDRESSES); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 288 | if (channel_arg != NULL) { |
| 289 | GPR_ASSERT(channel_arg->type == GRPC_ARG_POINTER); |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 290 | grpc_lb_addresses *addresses = channel_arg->value.pointer.p; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 291 | bool found_backend_address = false; |
| 292 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
| 293 | if (!addresses->addresses[i].is_balancer) { |
| 294 | found_backend_address = true; |
| 295 | break; |
| 296 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 297 | } |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 298 | if (!found_backend_address) { |
| 299 | if (lb_policy_name != NULL && strcmp(lb_policy_name, "grpclb") != 0) { |
| 300 | gpr_log(GPR_INFO, |
| 301 | "resolver requested LB policy %s but provided only balancer " |
| 302 | "addresses, no backend addresses -- forcing use of grpclb LB " |
| 303 | "policy", |
Mark D. Roth | 5f40e5d | 2016-10-24 13:09:05 -0700 | [diff] [blame] | 304 | lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 305 | } |
| 306 | lb_policy_name = "grpclb"; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 307 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 308 | } |
| 309 | // Use pick_first if nothing was specified and we didn't select grpclb |
| 310 | // above. |
| 311 | if (lb_policy_name == NULL) lb_policy_name = "pick_first"; |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 312 | // Instantiate LB policy. |
| 313 | grpc_lb_policy_args lb_policy_args; |
| 314 | lb_policy_args.args = chand->resolver_result; |
| 315 | lb_policy_args.client_channel_factory = chand->client_channel_factory; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 316 | lb_policy = |
| 317 | grpc_lb_policy_create(exec_ctx, lb_policy_name, &lb_policy_args); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 318 | if (lb_policy != NULL) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 319 | GRPC_LB_POLICY_REF(lb_policy, "config_change"); |
Craig Tiller | f707d62 | 2016-05-06 14:26:12 -0700 | [diff] [blame] | 320 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 321 | state = |
| 322 | grpc_lb_policy_check_connectivity(exec_ctx, lb_policy, &state_error); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 323 | } |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 324 | // Find service config. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 325 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 326 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_SERVICE_CONFIG); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 327 | if (channel_arg != NULL) { |
Mark D. Roth | 9ec28af | 2016-11-03 12:32:39 -0700 | [diff] [blame] | 328 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 329 | service_config_json = gpr_strdup(channel_arg->value.string); |
Mark D. Roth | 70a1abd | 2016-11-04 09:26:37 -0700 | [diff] [blame] | 330 | grpc_service_config *service_config = |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 331 | grpc_service_config_create(service_config_json); |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 332 | if (service_config != NULL) { |
| 333 | method_params_table = grpc_service_config_create_method_config_table( |
Craig Tiller | b28c7e8 | 2016-11-18 10:29:04 -0800 | [diff] [blame] | 334 | exec_ctx, service_config, method_parameters_create_from_json, |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 335 | &method_parameters_vtable); |
| 336 | grpc_service_config_destroy(service_config); |
| 337 | } |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 338 | } |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 339 | // Before we clean up, save a copy of lb_policy_name, since it might |
| 340 | // be pointing to data inside chand->resolver_result. |
| 341 | // The copy will be saved in chand->lb_policy_name below. |
| 342 | lb_policy_name = gpr_strdup(lb_policy_name); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 343 | grpc_channel_args_destroy(exec_ctx, chand->resolver_result); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 344 | chand->resolver_result = NULL; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 347 | if (lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 348 | grpc_pollset_set_add_pollset_set(exec_ctx, lb_policy->interested_parties, |
| 349 | chand->interested_parties); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 350 | } |
| 351 | |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 352 | gpr_mu_lock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 353 | if (lb_policy_name != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 354 | gpr_free(chand->info_lb_policy_name); |
| 355 | chand->info_lb_policy_name = lb_policy_name; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 356 | } |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 357 | old_lb_policy = chand->lb_policy; |
| 358 | chand->lb_policy = lb_policy; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 359 | if (service_config_json != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 360 | gpr_free(chand->info_service_config_json); |
| 361 | chand->info_service_config_json = service_config_json; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 362 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 363 | gpr_mu_unlock(&chand->info_mu); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 364 | if (chand->method_params_table != NULL) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 365 | grpc_slice_hash_table_unref(exec_ctx, chand->method_params_table); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 366 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 367 | chand->method_params_table = method_params_table; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 368 | if (lb_policy != NULL) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 369 | grpc_closure_list_sched(exec_ctx, &chand->waiting_for_config_closures); |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 370 | } else if (chand->resolver == NULL /* disconnected */) { |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 371 | grpc_closure_list_fail_all( |
| 372 | &chand->waiting_for_config_closures, |
| 373 | GRPC_ERROR_CREATE_REFERENCING("Channel disconnected", &error, 1)); |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 374 | grpc_closure_list_sched(exec_ctx, &chand->waiting_for_config_closures); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 375 | } |
| 376 | if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) { |
| 377 | GRPC_LB_POLICY_REF(lb_policy, "exit_idle"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 378 | exit_idle = true; |
| 379 | chand->exit_idle_when_lb_policy_arrives = false; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 380 | } |
Craig Tiller | 9846503 | 2015-06-29 14:36:42 -0700 | [diff] [blame] | 381 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 382 | if (error == GRPC_ERROR_NONE && chand->resolver) { |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 383 | set_channel_connectivity_state_locked( |
| 384 | exec_ctx, chand, state, GRPC_ERROR_REF(state_error), "new_lb+resolver"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 385 | if (lb_policy != NULL) { |
| 386 | watch_lb_policy(exec_ctx, chand, lb_policy, state); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 387 | } |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 388 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 389 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 390 | &chand->on_resolver_result_changed); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 391 | } else { |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 392 | if (chand->resolver != NULL) { |
| 393 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 394 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 395 | chand->resolver = NULL; |
| 396 | } |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 397 | grpc_error *refs[] = {error, state_error}; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 398 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 399 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 400 | GRPC_ERROR_CREATE_REFERENCING("Got config after disconnection", refs, |
| 401 | GPR_ARRAY_SIZE(refs)), |
| 402 | "resolver_gone"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 403 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 404 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 405 | if (exit_idle) { |
| 406 | grpc_lb_policy_exit_idle(exec_ctx, lb_policy); |
| 407 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "exit_idle"); |
| 408 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 409 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 410 | if (old_lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 411 | grpc_pollset_set_del_pollset_set( |
| 412 | exec_ctx, old_lb_policy->interested_parties, chand->interested_parties); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 413 | GRPC_LB_POLICY_UNREF(exec_ctx, old_lb_policy, "channel"); |
| 414 | } |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 415 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 416 | if (lb_policy != NULL) { |
| 417 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "config_change"); |
| 418 | } |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 419 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 420 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver"); |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 421 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 422 | } |
| 423 | |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 424 | static void start_transport_op_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 425 | grpc_error *error_ignored) { |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 426 | grpc_transport_op *op = arg; |
| 427 | grpc_channel_element *elem = op->transport_private.args[0]; |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 428 | channel_data *chand = elem->channel_data; |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 429 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 430 | if (op->on_connectivity_state_change != NULL) { |
| 431 | grpc_connectivity_state_notify_on_state_change( |
| 432 | exec_ctx, &chand->state_tracker, op->connectivity_state, |
| 433 | op->on_connectivity_state_change); |
| 434 | op->on_connectivity_state_change = NULL; |
| 435 | op->connectivity_state = NULL; |
| 436 | } |
| 437 | |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 438 | if (op->send_ping != NULL) { |
Craig Tiller | 87b71e2 | 2015-12-07 15:14:14 -0800 | [diff] [blame] | 439 | if (chand->lb_policy == NULL) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 440 | grpc_closure_sched(exec_ctx, op->send_ping, |
| 441 | GRPC_ERROR_CREATE("Ping with no load balancing")); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 442 | } else { |
Craig Tiller | 28bf891 | 2015-12-07 16:07:04 -0800 | [diff] [blame] | 443 | 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] | 444 | op->bind_pollset = NULL; |
| 445 | } |
| 446 | op->send_ping = NULL; |
| 447 | } |
| 448 | |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 449 | if (op->disconnect_with_error != GRPC_ERROR_NONE) { |
| 450 | if (chand->resolver != NULL) { |
| 451 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 452 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 453 | GRPC_ERROR_REF(op->disconnect_with_error), "disconnect"); |
| 454 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 455 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 456 | chand->resolver = NULL; |
| 457 | if (!chand->started_resolving) { |
| 458 | grpc_closure_list_fail_all(&chand->waiting_for_config_closures, |
| 459 | GRPC_ERROR_REF(op->disconnect_with_error)); |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 460 | grpc_closure_list_sched(exec_ctx, &chand->waiting_for_config_closures); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 461 | } |
| 462 | if (chand->lb_policy != NULL) { |
| 463 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 464 | chand->lb_policy->interested_parties, |
| 465 | chand->interested_parties); |
| 466 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 467 | chand->lb_policy = NULL; |
| 468 | } |
Craig Tiller | b12d22a | 2016-04-23 12:50:21 -0700 | [diff] [blame] | 469 | } |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 470 | GRPC_ERROR_UNREF(op->disconnect_with_error); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 471 | } |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 472 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "start_transport_op"); |
| 473 | |
| 474 | grpc_closure_sched(exec_ctx, op->on_consumed, GRPC_ERROR_NONE); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | static void cc_start_transport_op(grpc_exec_ctx *exec_ctx, |
| 478 | grpc_channel_element *elem, |
| 479 | grpc_transport_op *op) { |
| 480 | channel_data *chand = elem->channel_data; |
| 481 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 482 | GPR_ASSERT(op->set_accept_stream == false); |
| 483 | if (op->bind_pollset != NULL) { |
| 484 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, |
| 485 | op->bind_pollset); |
| 486 | } |
| 487 | |
| 488 | op->transport_private.args[0] = elem; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 489 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "start_transport_op"); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 490 | grpc_closure_sched( |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 491 | exec_ctx, grpc_closure_init( |
| 492 | &op->transport_private.closure, start_transport_op_locked, |
| 493 | op, grpc_combiner_scheduler(chand->combiner, false)), |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 494 | GRPC_ERROR_NONE); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 495 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 496 | |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 497 | static void cc_get_channel_info(grpc_exec_ctx *exec_ctx, |
| 498 | grpc_channel_element *elem, |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 499 | const grpc_channel_info *info) { |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 500 | channel_data *chand = elem->channel_data; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 501 | gpr_mu_lock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 502 | if (info->lb_policy_name != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 503 | *info->lb_policy_name = chand->info_lb_policy_name == NULL |
Mark D. Roth | 78afd77 | 2016-11-04 12:49:49 -0700 | [diff] [blame] | 504 | ? NULL |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 505 | : gpr_strdup(chand->info_lb_policy_name); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 506 | } |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 507 | if (info->service_config_json != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 508 | *info->service_config_json = |
| 509 | chand->info_service_config_json == NULL |
| 510 | ? NULL |
| 511 | : gpr_strdup(chand->info_service_config_json); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 512 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 513 | gpr_mu_unlock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 514 | } |
| 515 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 516 | /* Constructor for channel_data */ |
Mark D. Roth | c108788 | 2016-11-18 10:54:45 -0800 | [diff] [blame] | 517 | static grpc_error *cc_init_channel_elem(grpc_exec_ctx *exec_ctx, |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame] | 518 | grpc_channel_element *elem, |
| 519 | grpc_channel_element_args *args) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 520 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 521 | memset(chand, 0, sizeof(*chand)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 522 | GPR_ASSERT(args->is_last); |
| 523 | GPR_ASSERT(elem->filter == &grpc_client_channel_filter); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 524 | // Initialize data members. |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 525 | chand->combiner = grpc_combiner_create(NULL); |
Craig Tiller | d8547751 | 2017-02-09 12:02:39 -0800 | [diff] [blame] | 526 | gpr_mu_init(&chand->info_mu); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 527 | chand->owning_stack = args->channel_stack; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 528 | grpc_closure_init(&chand->on_resolver_result_changed, |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 529 | on_resolver_result_changed_locked, chand, |
| 530 | grpc_combiner_scheduler(chand->combiner, false)); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 531 | chand->interested_parties = grpc_pollset_set_create(); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 532 | grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE, |
| 533 | "client_channel"); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 534 | // Record client channel factory. |
| 535 | const grpc_arg *arg = grpc_channel_args_find(args->channel_args, |
| 536 | GRPC_ARG_CLIENT_CHANNEL_FACTORY); |
| 537 | GPR_ASSERT(arg != NULL); |
| 538 | GPR_ASSERT(arg->type == GRPC_ARG_POINTER); |
| 539 | grpc_client_channel_factory_ref(arg->value.pointer.p); |
| 540 | chand->client_channel_factory = arg->value.pointer.p; |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 541 | // Get server name to resolve, using proxy mapper if needed. |
Mark D. Roth | 86e9059 | 2016-11-18 09:56:40 -0800 | [diff] [blame] | 542 | 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] | 543 | GPR_ASSERT(arg != NULL); |
| 544 | GPR_ASSERT(arg->type == GRPC_ARG_STRING); |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 545 | char *proxy_name = NULL; |
| 546 | grpc_channel_args *new_args = NULL; |
| 547 | grpc_proxy_mappers_map_name(exec_ctx, arg->value.string, args->channel_args, |
| 548 | &proxy_name, &new_args); |
| 549 | // Instantiate resolver. |
Mark D. Roth | 45ccec5 | 2017-01-18 14:04:01 -0800 | [diff] [blame] | 550 | chand->resolver = grpc_resolver_create( |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 551 | exec_ctx, proxy_name != NULL ? proxy_name : arg->value.string, |
| 552 | new_args != NULL ? new_args : args->channel_args, |
| 553 | chand->interested_parties); |
| 554 | if (proxy_name != NULL) gpr_free(proxy_name); |
| 555 | if (new_args != NULL) grpc_channel_args_destroy(exec_ctx, new_args); |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame] | 556 | if (chand->resolver == NULL) { |
| 557 | return GRPC_ERROR_CREATE("resolver creation failed"); |
| 558 | } |
| 559 | return GRPC_ERROR_NONE; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /* Destructor for channel_data */ |
| 563 | static void cc_destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| 564 | grpc_channel_element *elem) { |
| 565 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 566 | if (chand->resolver != NULL) { |
| 567 | grpc_resolver_shutdown(exec_ctx, chand->resolver); |
| 568 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 569 | } |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 570 | if (chand->client_channel_factory != NULL) { |
| 571 | grpc_client_channel_factory_unref(exec_ctx, chand->client_channel_factory); |
| 572 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 573 | if (chand->lb_policy != NULL) { |
| 574 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 575 | chand->lb_policy->interested_parties, |
| 576 | chand->interested_parties); |
| 577 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 578 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 579 | gpr_free(chand->info_lb_policy_name); |
| 580 | gpr_free(chand->info_service_config_json); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 581 | if (chand->method_params_table != NULL) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 582 | grpc_slice_hash_table_unref(exec_ctx, chand->method_params_table); |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 583 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 584 | grpc_connectivity_state_destroy(exec_ctx, &chand->state_tracker); |
| 585 | grpc_pollset_set_destroy(chand->interested_parties); |
Craig Tiller | f102167 | 2017-02-09 21:29:50 -0800 | [diff] [blame] | 586 | GRPC_COMBINER_UNREF(exec_ctx, chand->combiner, "client_channel"); |
Craig Tiller | d8547751 | 2017-02-09 12:02:39 -0800 | [diff] [blame] | 587 | gpr_mu_destroy(&chand->info_mu); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | /************************************************************************* |
| 591 | * PER-CALL FUNCTIONS |
| 592 | */ |
| 593 | |
| 594 | #define GET_CALL(call_data) \ |
| 595 | ((grpc_subchannel_call *)(gpr_atm_acq_load(&(call_data)->subchannel_call))) |
| 596 | |
| 597 | #define CANCELLED_CALL ((grpc_subchannel_call *)1) |
| 598 | |
| 599 | typedef enum { |
| 600 | GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING, |
| 601 | GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL |
| 602 | } subchannel_creation_phase; |
| 603 | |
| 604 | /** Call data. Holds a pointer to grpc_subchannel_call and the |
| 605 | associated machinery to create such a pointer. |
| 606 | Handles queueing of stream ops until a call object is ready, waiting |
| 607 | for initial metadata before trying to create a call object, |
| 608 | and handling cancellation gracefully. */ |
| 609 | typedef struct client_channel_call_data { |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 610 | // State for handling deadlines. |
| 611 | // 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] | 612 | // TODO(roth): This is slightly sub-optimal in that grpc_deadline_state |
| 613 | // and this struct both independently store a pointer to the call |
| 614 | // 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] | 615 | // to avoid this without breaking the grpc_deadline_state abstraction. |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 616 | grpc_deadline_state deadline_state; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 617 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 618 | grpc_slice path; // Request path. |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 619 | gpr_timespec call_start_time; |
| 620 | gpr_timespec deadline; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 621 | wait_for_ready_value wait_for_ready_from_service_config; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 622 | grpc_closure read_service_config; |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 623 | |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 624 | grpc_error *cancel_error; |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 625 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 626 | /** either 0 for no call, 1 for cancelled, or a pointer to a |
| 627 | grpc_subchannel_call */ |
| 628 | gpr_atm subchannel_call; |
| 629 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 630 | subchannel_creation_phase creation_phase; |
| 631 | grpc_connected_subchannel *connected_subchannel; |
| 632 | grpc_polling_entity *pollent; |
| 633 | |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 634 | grpc_transport_stream_op **waiting_ops; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 635 | size_t waiting_ops_count; |
| 636 | size_t waiting_ops_capacity; |
| 637 | |
| 638 | grpc_closure next_step; |
| 639 | |
| 640 | grpc_call_stack *owning_call; |
David Garcia Quintas | d1a47f1 | 2016-09-02 12:46:44 +0200 | [diff] [blame] | 641 | |
| 642 | grpc_linked_mdelem lb_token_mdelem; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 643 | } call_data; |
| 644 | |
Craig Tiller | 8b1d59c | 2016-12-27 15:15:30 -0800 | [diff] [blame] | 645 | grpc_subchannel_call *grpc_client_channel_get_subchannel_call( |
| 646 | grpc_call_element *call_elem) { |
| 647 | grpc_subchannel_call *scc = GET_CALL((call_data *)call_elem->call_data); |
| 648 | return scc == CANCELLED_CALL ? NULL : scc; |
| 649 | } |
| 650 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 651 | static void add_waiting_locked(call_data *calld, grpc_transport_stream_op *op) { |
| 652 | GPR_TIMER_BEGIN("add_waiting_locked", 0); |
| 653 | if (calld->waiting_ops_count == calld->waiting_ops_capacity) { |
| 654 | calld->waiting_ops_capacity = GPR_MAX(3, 2 * calld->waiting_ops_capacity); |
| 655 | calld->waiting_ops = |
| 656 | gpr_realloc(calld->waiting_ops, |
| 657 | calld->waiting_ops_capacity * sizeof(*calld->waiting_ops)); |
| 658 | } |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 659 | calld->waiting_ops[calld->waiting_ops_count++] = op; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 660 | GPR_TIMER_END("add_waiting_locked", 0); |
| 661 | } |
| 662 | |
| 663 | static void fail_locked(grpc_exec_ctx *exec_ctx, call_data *calld, |
| 664 | grpc_error *error) { |
| 665 | size_t i; |
| 666 | for (i = 0; i < calld->waiting_ops_count; i++) { |
| 667 | grpc_transport_stream_op_finish_with_failure( |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 668 | exec_ctx, calld->waiting_ops[i], GRPC_ERROR_REF(error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 669 | } |
| 670 | calld->waiting_ops_count = 0; |
| 671 | GRPC_ERROR_UNREF(error); |
| 672 | } |
| 673 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 674 | 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] | 675 | if (calld->waiting_ops_count == 0) { |
| 676 | return; |
| 677 | } |
| 678 | |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 679 | grpc_subchannel_call *call = GET_CALL(calld); |
| 680 | grpc_transport_stream_op **ops = calld->waiting_ops; |
| 681 | size_t nops = calld->waiting_ops_count; |
| 682 | if (call == CANCELLED_CALL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 683 | fail_locked(exec_ctx, calld, GRPC_ERROR_CANCELLED); |
| 684 | return; |
| 685 | } |
| 686 | calld->waiting_ops = NULL; |
| 687 | calld->waiting_ops_count = 0; |
| 688 | calld->waiting_ops_capacity = 0; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 689 | for (size_t i = 0; i < nops; i++) { |
| 690 | grpc_subchannel_call_process_op(exec_ctx, call, ops[i]); |
| 691 | } |
Craig Tiller | 9efea88 | 2017-02-09 13:06:52 -0800 | [diff] [blame] | 692 | gpr_free(ops); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 693 | } |
| 694 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 695 | static void subchannel_ready_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 696 | grpc_error *error) { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 697 | grpc_call_element *elem = arg; |
| 698 | call_data *calld = elem->call_data; |
| 699 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 700 | GPR_ASSERT(calld->creation_phase == |
| 701 | GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL); |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 702 | grpc_polling_entity_del_from_pollset_set(exec_ctx, calld->pollent, |
| 703 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 704 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 705 | if (calld->connected_subchannel == NULL) { |
| 706 | gpr_atm_no_barrier_store(&calld->subchannel_call, 1); |
| 707 | fail_locked(exec_ctx, calld, GRPC_ERROR_CREATE_REFERENCING( |
| 708 | "Failed to create subchannel", &error, 1)); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 709 | } else if (GET_CALL(calld) == CANCELLED_CALL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 710 | /* already cancelled before subchannel became ready */ |
David Garcia Quintas | 68a9e38 | 2016-12-13 10:50:40 -0800 | [diff] [blame] | 711 | grpc_error *cancellation_error = GRPC_ERROR_CREATE_REFERENCING( |
| 712 | "Cancelled before creating subchannel", &error, 1); |
| 713 | /* if due to deadline, attach the deadline exceeded status to the error */ |
| 714 | if (gpr_time_cmp(calld->deadline, gpr_now(GPR_CLOCK_MONOTONIC)) < 0) { |
| 715 | cancellation_error = |
| 716 | grpc_error_set_int(cancellation_error, GRPC_ERROR_INT_GRPC_STATUS, |
| 717 | GRPC_STATUS_DEADLINE_EXCEEDED); |
| 718 | } |
| 719 | fail_locked(exec_ctx, calld, cancellation_error); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 720 | } else { |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 721 | /* Create call on subchannel. */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 722 | grpc_subchannel_call *subchannel_call = NULL; |
| 723 | grpc_error *new_error = grpc_connected_subchannel_create_call( |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 724 | exec_ctx, calld->connected_subchannel, calld->pollent, calld->path, |
Mark D. Roth | 3d88341 | 2016-11-07 13:42:54 -0800 | [diff] [blame] | 725 | calld->call_start_time, calld->deadline, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 726 | if (new_error != GRPC_ERROR_NONE) { |
| 727 | new_error = grpc_error_add_child(new_error, error); |
| 728 | subchannel_call = CANCELLED_CALL; |
| 729 | fail_locked(exec_ctx, calld, new_error); |
| 730 | } |
| 731 | gpr_atm_rel_store(&calld->subchannel_call, |
| 732 | (gpr_atm)(uintptr_t)subchannel_call); |
| 733 | retry_waiting_locked(exec_ctx, calld); |
| 734 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 735 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
| 736 | } |
| 737 | |
| 738 | static char *cc_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) { |
| 739 | call_data *calld = elem->call_data; |
| 740 | grpc_subchannel_call *subchannel_call = GET_CALL(calld); |
| 741 | if (subchannel_call == NULL || subchannel_call == CANCELLED_CALL) { |
| 742 | return NULL; |
| 743 | } else { |
| 744 | return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call); |
| 745 | } |
| 746 | } |
| 747 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 748 | typedef struct { |
| 749 | grpc_metadata_batch *initial_metadata; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 750 | uint32_t initial_metadata_flags; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 751 | grpc_connected_subchannel **connected_subchannel; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 752 | grpc_closure *on_ready; |
| 753 | grpc_call_element *elem; |
| 754 | grpc_closure closure; |
| 755 | } continue_picking_args; |
| 756 | |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 757 | /** Return true if subchannel is available immediately (in which case on_ready |
| 758 | should not be called), or false otherwise (in which case on_ready should be |
| 759 | called when the subchannel is available). */ |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 760 | static bool pick_subchannel_locked( |
| 761 | grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 762 | grpc_metadata_batch *initial_metadata, uint32_t initial_metadata_flags, |
| 763 | grpc_connected_subchannel **connected_subchannel, grpc_closure *on_ready, |
| 764 | grpc_error *error); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 765 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 766 | static void continue_picking_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 767 | grpc_error *error) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 768 | continue_picking_args *cpa = arg; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 769 | if (cpa->connected_subchannel == NULL) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 770 | /* cancelled, do nothing */ |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 771 | } else if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 772 | grpc_closure_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_REF(error)); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 773 | } else { |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 774 | if (pick_subchannel_locked(exec_ctx, cpa->elem, cpa->initial_metadata, |
| 775 | cpa->initial_metadata_flags, |
| 776 | cpa->connected_subchannel, cpa->on_ready, |
| 777 | GRPC_ERROR_NONE)) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 778 | grpc_closure_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_NONE); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 779 | } |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 780 | } |
| 781 | gpr_free(cpa); |
| 782 | } |
| 783 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 784 | static bool pick_subchannel_locked( |
| 785 | grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 786 | grpc_metadata_batch *initial_metadata, uint32_t initial_metadata_flags, |
| 787 | grpc_connected_subchannel **connected_subchannel, grpc_closure *on_ready, |
| 788 | grpc_error *error) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 789 | GPR_TIMER_BEGIN("pick_subchannel", 0); |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 790 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 791 | channel_data *chand = elem->channel_data; |
| 792 | call_data *calld = elem->call_data; |
| 793 | continue_picking_args *cpa; |
| 794 | grpc_closure *closure; |
| 795 | |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 796 | GPR_ASSERT(connected_subchannel); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 797 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 798 | if (initial_metadata == NULL) { |
| 799 | if (chand->lb_policy != NULL) { |
Craig Tiller | ab33b48 | 2015-11-21 08:11:04 -0800 | [diff] [blame] | 800 | grpc_lb_policy_cancel_pick(exec_ctx, chand->lb_policy, |
Mark D. Roth | 5f84400 | 2016-09-08 08:20:53 -0700 | [diff] [blame] | 801 | connected_subchannel, GRPC_ERROR_REF(error)); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 802 | } |
| 803 | for (closure = chand->waiting_for_config_closures.head; closure != NULL; |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 804 | closure = closure->next_data.next) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 805 | cpa = closure->cb_arg; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 806 | if (cpa->connected_subchannel == connected_subchannel) { |
| 807 | cpa->connected_subchannel = NULL; |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 808 | grpc_closure_sched( |
Mark D. Roth | 932b10c | 2016-09-09 08:44:30 -0700 | [diff] [blame] | 809 | exec_ctx, cpa->on_ready, |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 810 | GRPC_ERROR_CREATE_REFERENCING("Pick cancelled", &error, 1)); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 811 | } |
| 812 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 813 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 697a1f6 | 2016-09-07 13:35:07 -0700 | [diff] [blame] | 814 | GRPC_ERROR_UNREF(error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 815 | return true; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 816 | } |
Mark D. Roth | 697a1f6 | 2016-09-07 13:35:07 -0700 | [diff] [blame] | 817 | GPR_ASSERT(error == GRPC_ERROR_NONE); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 818 | if (chand->lb_policy != NULL) { |
Craig Tiller | 86c0f8a | 2015-12-01 20:05:40 -0800 | [diff] [blame] | 819 | grpc_lb_policy *lb_policy = chand->lb_policy; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 820 | GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel"); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 821 | // If the application explicitly set wait_for_ready, use that. |
| 822 | // Otherwise, if the service config specified a value for this |
| 823 | // method, use that. |
Mark D. Roth | c1c3858 | 2016-10-11 11:03:27 -0700 | [diff] [blame] | 824 | const bool wait_for_ready_set_from_api = |
| 825 | initial_metadata_flags & |
| 826 | GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET; |
| 827 | const bool wait_for_ready_set_from_service_config = |
| 828 | calld->wait_for_ready_from_service_config != WAIT_FOR_READY_UNSET; |
| 829 | if (!wait_for_ready_set_from_api && |
| 830 | wait_for_ready_set_from_service_config) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 831 | if (calld->wait_for_ready_from_service_config == WAIT_FOR_READY_TRUE) { |
| 832 | initial_metadata_flags |= GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 833 | } else { |
| 834 | initial_metadata_flags &= ~GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 835 | } |
| 836 | } |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 837 | const grpc_lb_policy_pick_args inputs = { |
Yuchen Zeng | ac8bc42 | 2016-10-05 14:00:02 -0700 | [diff] [blame] | 838 | initial_metadata, initial_metadata_flags, &calld->lb_token_mdelem, |
| 839 | gpr_inf_future(GPR_CLOCK_MONOTONIC)}; |
Mark D. Roth | 55f25b6 | 2016-10-12 14:55:20 -0700 | [diff] [blame] | 840 | const bool result = grpc_lb_policy_pick( |
| 841 | exec_ctx, lb_policy, &inputs, connected_subchannel, NULL, on_ready); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 842 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "pick_subchannel"); |
| 843 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 844 | return result; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 845 | } |
| 846 | if (chand->resolver != NULL && !chand->started_resolving) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 847 | chand->started_resolving = true; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 848 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 849 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 850 | &chand->on_resolver_result_changed); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 851 | } |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 852 | if (chand->resolver != NULL) { |
| 853 | cpa = gpr_malloc(sizeof(*cpa)); |
| 854 | cpa->initial_metadata = initial_metadata; |
| 855 | cpa->initial_metadata_flags = initial_metadata_flags; |
| 856 | cpa->connected_subchannel = connected_subchannel; |
| 857 | cpa->on_ready = on_ready; |
| 858 | cpa->elem = elem; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 859 | grpc_closure_init(&cpa->closure, continue_picking_locked, cpa, |
| 860 | grpc_combiner_scheduler(chand->combiner, true)); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 861 | grpc_closure_list_append(&chand->waiting_for_config_closures, &cpa->closure, |
| 862 | GRPC_ERROR_NONE); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 863 | } else { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 864 | grpc_closure_sched(exec_ctx, on_ready, GRPC_ERROR_CREATE("Disconnected")); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 865 | } |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 866 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 867 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 868 | return false; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 869 | } |
| 870 | |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 871 | static void start_transport_stream_op_locked_inner(grpc_exec_ctx *exec_ctx, |
| 872 | grpc_transport_stream_op *op, |
| 873 | grpc_call_element *elem) { |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 874 | channel_data *chand = elem->channel_data; |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 875 | call_data *calld = elem->call_data; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 876 | grpc_subchannel_call *call; |
| 877 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 878 | /* need to recheck that another thread hasn't set the call */ |
| 879 | call = GET_CALL(calld); |
| 880 | if (call == CANCELLED_CALL) { |
| 881 | grpc_transport_stream_op_finish_with_failure( |
| 882 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 883 | /* early out */ |
| 884 | return; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 885 | } |
| 886 | if (call != NULL) { |
| 887 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 888 | /* early out */ |
| 889 | return; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 890 | } |
| 891 | /* if this is a cancellation, then we can raise our cancelled flag */ |
| 892 | if (op->cancel_error != GRPC_ERROR_NONE) { |
| 893 | if (!gpr_atm_rel_cas(&calld->subchannel_call, 0, |
| 894 | (gpr_atm)(uintptr_t)CANCELLED_CALL)) { |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 895 | /* recurse to retry */ |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 896 | start_transport_stream_op_locked_inner(exec_ctx, op, elem); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 897 | /* early out */ |
| 898 | return; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 899 | } else { |
Craig Tiller | be9691a | 2017-02-14 10:00:42 -0800 | [diff] [blame] | 900 | /* Stash a copy of cancel_error in our call data, so that we can use |
| 901 | it for subsequent operations. This ensures that if the call is |
| 902 | cancelled before any ops are passed down (e.g., if the deadline |
| 903 | is in the past when the call starts), we can return the right |
| 904 | error to the caller when the first op does get passed down. */ |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 905 | calld->cancel_error = GRPC_ERROR_REF(op->cancel_error); |
| 906 | switch (calld->creation_phase) { |
| 907 | case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING: |
| 908 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(op->cancel_error)); |
| 909 | break; |
| 910 | case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL: |
| 911 | pick_subchannel_locked(exec_ctx, elem, NULL, 0, |
| 912 | &calld->connected_subchannel, NULL, |
| 913 | GRPC_ERROR_REF(op->cancel_error)); |
| 914 | break; |
| 915 | } |
| 916 | grpc_transport_stream_op_finish_with_failure( |
| 917 | exec_ctx, op, GRPC_ERROR_REF(op->cancel_error)); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 918 | /* early out */ |
| 919 | return; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 920 | } |
| 921 | } |
| 922 | /* if we don't have a subchannel, try to get one */ |
| 923 | if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && |
| 924 | calld->connected_subchannel == NULL && |
| 925 | op->send_initial_metadata != NULL) { |
| 926 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL; |
| 927 | grpc_closure_init(&calld->next_step, subchannel_ready_locked, elem, |
| 928 | grpc_combiner_scheduler(chand->combiner, true)); |
| 929 | GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel"); |
| 930 | /* If a subchannel is not available immediately, the polling entity from |
| 931 | call_data should be provided to channel_data's interested_parties, so |
| 932 | that IO of the lb_policy and resolver could be done under it. */ |
| 933 | if (pick_subchannel_locked(exec_ctx, elem, op->send_initial_metadata, |
| 934 | op->send_initial_metadata_flags, |
| 935 | &calld->connected_subchannel, &calld->next_step, |
| 936 | GRPC_ERROR_NONE)) { |
| 937 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 938 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
| 939 | } else { |
| 940 | grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent, |
| 941 | chand->interested_parties); |
| 942 | } |
| 943 | } |
| 944 | /* if we've got a subchannel, then let's ask it to create a call */ |
| 945 | if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && |
| 946 | calld->connected_subchannel != NULL) { |
| 947 | grpc_subchannel_call *subchannel_call = NULL; |
| 948 | grpc_error *error = grpc_connected_subchannel_create_call( |
| 949 | exec_ctx, calld->connected_subchannel, calld->pollent, calld->path, |
| 950 | calld->call_start_time, calld->deadline, &subchannel_call); |
| 951 | if (error != GRPC_ERROR_NONE) { |
| 952 | subchannel_call = CANCELLED_CALL; |
| 953 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(error)); |
| 954 | grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error); |
| 955 | } |
| 956 | gpr_atm_rel_store(&calld->subchannel_call, |
| 957 | (gpr_atm)(uintptr_t)subchannel_call); |
| 958 | retry_waiting_locked(exec_ctx, calld); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 959 | /* recurse to retry */ |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 960 | start_transport_stream_op_locked_inner(exec_ctx, op, elem); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 961 | /* early out */ |
| 962 | return; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 963 | } |
| 964 | /* nothing to be done but wait */ |
| 965 | add_waiting_locked(calld, op); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 966 | } |
| 967 | |
| 968 | static void cc_start_transport_stream_op_locked(grpc_exec_ctx *exec_ctx, |
| 969 | void *arg, |
| 970 | grpc_error *error_ignored) { |
| 971 | GPR_TIMER_BEGIN("cc_start_transport_stream_op_locked", 0); |
| 972 | |
| 973 | grpc_transport_stream_op *op = arg; |
| 974 | grpc_call_element *elem = op->handler_private.args[0]; |
| 975 | call_data *calld = elem->call_data; |
| 976 | |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 977 | start_transport_stream_op_locked_inner(exec_ctx, op, elem); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 978 | |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 979 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, |
| 980 | "start_transport_stream_op"); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 981 | GPR_TIMER_END("cc_start_transport_stream_op_locked", 0); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 982 | } |
| 983 | |
Craig Tiller | be9691a | 2017-02-14 10:00:42 -0800 | [diff] [blame] | 984 | /* The logic here is fairly complicated, due to (a) the fact that we |
| 985 | need to handle the case where we receive the send op before the |
| 986 | initial metadata op, and (b) the need for efficiency, especially in |
| 987 | the streaming case. |
| 988 | |
| 989 | We use double-checked locking to initially see if initialization has been |
| 990 | performed. If it has not, we acquire the combiner and perform initialization. |
| 991 | If it has, we proceed on the fast path. */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 992 | static void cc_start_transport_stream_op(grpc_exec_ctx *exec_ctx, |
| 993 | grpc_call_element *elem, |
| 994 | grpc_transport_stream_op *op) { |
| 995 | call_data *calld = elem->call_data; |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 996 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 997 | GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 998 | 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] | 999 | /* try to (atomically) get the call */ |
| 1000 | grpc_subchannel_call *call = GET_CALL(calld); |
| 1001 | GPR_TIMER_BEGIN("cc_start_transport_stream_op", 0); |
| 1002 | if (call == CANCELLED_CALL) { |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1003 | grpc_transport_stream_op_finish_with_failure( |
| 1004 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1005 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1006 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1007 | return; |
| 1008 | } |
| 1009 | if (call != NULL) { |
| 1010 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
| 1011 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1012 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1013 | return; |
| 1014 | } |
| 1015 | /* we failed; lock and figure out what to do */ |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1016 | GRPC_CALL_STACK_REF(calld->owning_call, "start_transport_stream_op"); |
Craig Tiller | 4a84bdd | 2017-02-14 09:48:41 -0800 | [diff] [blame] | 1017 | op->handler_private.args[0] = elem; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1018 | grpc_closure_sched( |
| 1019 | exec_ctx, |
Craig Tiller | 4a84bdd | 2017-02-14 09:48:41 -0800 | [diff] [blame] | 1020 | grpc_closure_init(&op->handler_private.closure, |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1021 | cc_start_transport_stream_op_locked, op, |
| 1022 | grpc_combiner_scheduler(chand->combiner, false)), |
| 1023 | GRPC_ERROR_NONE); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1024 | GPR_TIMER_END("cc_start_transport_stream_op", 0); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1025 | } |
| 1026 | |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1027 | // Gets data from the service config. Invoked when the resolver returns |
| 1028 | // its initial result. |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1029 | static void read_service_config_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 1030 | grpc_error *error) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1031 | grpc_call_element *elem = arg; |
| 1032 | channel_data *chand = elem->channel_data; |
| 1033 | call_data *calld = elem->call_data; |
| 1034 | // 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] | 1035 | if (error == GRPC_ERROR_NONE) { |
| 1036 | // Get the method config table from channel data. |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1037 | grpc_slice_hash_table *method_params_table = NULL; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1038 | if (chand->method_params_table != NULL) { |
| 1039 | method_params_table = |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1040 | grpc_slice_hash_table_ref(chand->method_params_table); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1041 | } |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 1042 | // If the method config table was present, use it. |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1043 | if (method_params_table != NULL) { |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 1044 | const method_parameters *method_params = grpc_method_config_table_get( |
| 1045 | exec_ctx, method_params_table, calld->path); |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1046 | if (method_params != NULL) { |
| 1047 | const bool have_method_timeout = |
| 1048 | gpr_time_cmp(method_params->timeout, gpr_time_0(GPR_TIMESPAN)) != 0; |
| 1049 | if (have_method_timeout || |
| 1050 | method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1051 | if (have_method_timeout) { |
| 1052 | const gpr_timespec per_method_deadline = |
| 1053 | gpr_time_add(calld->call_start_time, method_params->timeout); |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 1054 | if (gpr_time_cmp(per_method_deadline, calld->deadline) < 0) { |
| 1055 | calld->deadline = per_method_deadline; |
| 1056 | // Reset deadline timer. |
| 1057 | grpc_deadline_state_reset(exec_ctx, elem, calld->deadline); |
| 1058 | } |
| 1059 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1060 | if (method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 1061 | calld->wait_for_ready_from_service_config = |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 1062 | method_params->wait_for_ready; |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 1063 | } |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 1064 | } |
| 1065 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1066 | grpc_slice_hash_table_unref(exec_ctx, method_params_table); |
Mark D. Roth | 196387a | 2016-10-12 14:53:36 -0700 | [diff] [blame] | 1067 | } |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1068 | } |
Mark D. Roth | 31292f2 | 2016-10-12 13:14:07 -0700 | [diff] [blame] | 1069 | 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] | 1070 | } |
| 1071 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1072 | static void initial_read_service_config_locked(grpc_exec_ctx *exec_ctx, |
| 1073 | void *arg, |
| 1074 | grpc_error *error_ignored) { |
| 1075 | grpc_call_element *elem = arg; |
| 1076 | channel_data *chand = elem->channel_data; |
| 1077 | call_data *calld = elem->call_data; |
| 1078 | // If the resolver has already returned results, then we can access |
| 1079 | // the service config parameters immediately. Otherwise, we need to |
| 1080 | // defer that work until the resolver returns an initial result. |
| 1081 | // TODO(roth): This code is almost but not quite identical to the code |
| 1082 | // in read_service_config() above. It would be nice to find a way to |
| 1083 | // combine them, to avoid having to maintain it twice. |
| 1084 | if (chand->lb_policy != NULL) { |
| 1085 | // We already have a resolver result, so check for service config. |
| 1086 | if (chand->method_params_table != NULL) { |
| 1087 | grpc_slice_hash_table *method_params_table = |
| 1088 | grpc_slice_hash_table_ref(chand->method_params_table); |
| 1089 | method_parameters *method_params = grpc_method_config_table_get( |
| 1090 | exec_ctx, method_params_table, calld->path); |
| 1091 | if (method_params != NULL) { |
| 1092 | if (gpr_time_cmp(method_params->timeout, |
| 1093 | gpr_time_0(GPR_CLOCK_MONOTONIC)) != 0) { |
| 1094 | gpr_timespec per_method_deadline = |
| 1095 | gpr_time_add(calld->call_start_time, method_params->timeout); |
| 1096 | calld->deadline = gpr_time_min(calld->deadline, per_method_deadline); |
| 1097 | } |
| 1098 | if (method_params->wait_for_ready != WAIT_FOR_READY_UNSET) { |
| 1099 | calld->wait_for_ready_from_service_config = |
| 1100 | method_params->wait_for_ready; |
| 1101 | } |
| 1102 | } |
| 1103 | grpc_slice_hash_table_unref(exec_ctx, method_params_table); |
| 1104 | } |
| 1105 | } else { |
| 1106 | // We don't yet have a resolver result, so register a callback to |
| 1107 | // get the service config data once the resolver returns. |
| 1108 | // Take a reference to the call stack to be owned by the callback. |
| 1109 | GRPC_CALL_STACK_REF(calld->owning_call, "read_service_config"); |
| 1110 | grpc_closure_init(&calld->read_service_config, read_service_config_locked, |
| 1111 | elem, grpc_combiner_scheduler(chand->combiner, false)); |
| 1112 | grpc_closure_list_append(&chand->waiting_for_config_closures, |
| 1113 | &calld->read_service_config, GRPC_ERROR_NONE); |
| 1114 | } |
| 1115 | // Start the deadline timer with the current deadline value. If we |
| 1116 | // do not yet have service config data, then the timer may be reset |
| 1117 | // later. |
| 1118 | grpc_deadline_state_start(exec_ctx, elem, calld->deadline); |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1119 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, |
| 1120 | "initial_read_service_config"); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1121 | } |
| 1122 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1123 | /* Constructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1124 | static grpc_error *cc_init_call_elem(grpc_exec_ctx *exec_ctx, |
| 1125 | grpc_call_element *elem, |
| 1126 | grpc_call_element_args *args) { |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 1127 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1128 | call_data *calld = elem->call_data; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1129 | // Initialize data members. |
| 1130 | grpc_deadline_state_init(exec_ctx, elem, args->call_stack); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1131 | calld->path = grpc_slice_ref_internal(args->path); |
Mark D. Roth | ff08f33 | 2016-10-14 13:01:01 -0700 | [diff] [blame] | 1132 | calld->call_start_time = args->start_time; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1133 | calld->deadline = gpr_convert_clock_type(args->deadline, GPR_CLOCK_MONOTONIC); |
| 1134 | calld->wait_for_ready_from_service_config = WAIT_FOR_READY_UNSET; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1135 | calld->cancel_error = GRPC_ERROR_NONE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1136 | gpr_atm_rel_store(&calld->subchannel_call, 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1137 | calld->connected_subchannel = NULL; |
| 1138 | calld->waiting_ops = NULL; |
| 1139 | calld->waiting_ops_count = 0; |
| 1140 | calld->waiting_ops_capacity = 0; |
| 1141 | calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; |
| 1142 | calld->owning_call = args->call_stack; |
| 1143 | calld->pollent = NULL; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1144 | GRPC_CALL_STACK_REF(calld->owning_call, "initial_read_service_config"); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1145 | grpc_closure_sched( |
| 1146 | exec_ctx, |
| 1147 | grpc_closure_init(&calld->read_service_config, |
| 1148 | initial_read_service_config_locked, elem, |
| 1149 | grpc_combiner_scheduler(chand->combiner, false)), |
| 1150 | GRPC_ERROR_NONE); |
Mark D. Roth | 0badbe8 | 2016-06-23 10:15:12 -0700 | [diff] [blame] | 1151 | return GRPC_ERROR_NONE; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1152 | } |
| 1153 | |
| 1154 | /* Destructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1155 | static void cc_destroy_call_elem(grpc_exec_ctx *exec_ctx, |
| 1156 | grpc_call_element *elem, |
| 1157 | const grpc_call_final_info *final_info, |
| 1158 | void *and_free_memory) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1159 | call_data *calld = elem->call_data; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1160 | grpc_deadline_state_destroy(exec_ctx, elem); |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1161 | grpc_slice_unref_internal(exec_ctx, calld->path); |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1162 | GRPC_ERROR_UNREF(calld->cancel_error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1163 | grpc_subchannel_call *call = GET_CALL(calld); |
| 1164 | if (call != NULL && call != CANCELLED_CALL) { |
| 1165 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "client_channel_destroy_call"); |
| 1166 | } |
| 1167 | GPR_ASSERT(calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1168 | GPR_ASSERT(calld->waiting_ops_count == 0); |
Craig Tiller | 693d394 | 2016-10-27 16:51:25 -0700 | [diff] [blame] | 1169 | if (calld->connected_subchannel != NULL) { |
| 1170 | GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, calld->connected_subchannel, |
| 1171 | "picked"); |
| 1172 | } |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1173 | gpr_free(calld->waiting_ops); |
Craig Tiller | 2c8063c | 2016-03-22 22:12:15 -0700 | [diff] [blame] | 1174 | gpr_free(and_free_memory); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1175 | } |
| 1176 | |
David Garcia Quintas | f72eb97 | 2016-05-03 18:28:09 -0700 | [diff] [blame] | 1177 | static void cc_set_pollset_or_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1178 | grpc_call_element *elem, |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1179 | grpc_polling_entity *pollent) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1180 | call_data *calld = elem->call_data; |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1181 | calld->pollent = pollent; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1182 | } |
| 1183 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1184 | /************************************************************************* |
| 1185 | * EXPORTED SYMBOLS |
| 1186 | */ |
| 1187 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1188 | const grpc_channel_filter grpc_client_channel_filter = { |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1189 | cc_start_transport_stream_op, |
| 1190 | cc_start_transport_op, |
| 1191 | sizeof(call_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1192 | cc_init_call_elem, |
David Garcia Quintas | 4afce7e | 2016-04-18 16:25:17 -0700 | [diff] [blame] | 1193 | cc_set_pollset_or_pollset_set, |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1194 | cc_destroy_call_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1195 | sizeof(channel_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1196 | cc_init_channel_elem, |
| 1197 | cc_destroy_channel_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1198 | cc_get_peer, |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 1199 | cc_get_channel_info, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1200 | "client-channel", |
Craig Tiller | 87d5b19 | 2015-04-16 14:37:57 -0700 | [diff] [blame] | 1201 | }; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1202 | |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1203 | static void try_to_connect_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 1204 | grpc_error *error_ignored) { |
| 1205 | channel_data *chand = arg; |
| 1206 | if (chand->lb_policy != NULL) { |
| 1207 | grpc_lb_policy_exit_idle(exec_ctx, chand->lb_policy); |
| 1208 | } else { |
| 1209 | chand->exit_idle_when_lb_policy_arrives = true; |
| 1210 | if (!chand->started_resolving && chand->resolver != NULL) { |
| 1211 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
| 1212 | chand->started_resolving = true; |
| 1213 | grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result, |
| 1214 | &chand->on_resolver_result_changed); |
| 1215 | } |
| 1216 | } |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1217 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "try_to_connect"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1218 | } |
| 1219 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1220 | grpc_connectivity_state grpc_client_channel_check_connectivity_state( |
| 1221 | 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] | 1222 | channel_data *chand = elem->channel_data; |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 1223 | grpc_connectivity_state out = |
| 1224 | grpc_connectivity_state_check(&chand->state_tracker); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1225 | if (out == GRPC_CHANNEL_IDLE && try_to_connect) { |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1226 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "try_to_connect"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1227 | grpc_closure_sched( |
| 1228 | exec_ctx, |
| 1229 | grpc_closure_create(try_to_connect_locked, chand, |
| 1230 | grpc_combiner_scheduler(chand->combiner, false)), |
| 1231 | GRPC_ERROR_NONE); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1232 | } |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1233 | return out; |
| 1234 | } |
| 1235 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1236 | typedef struct { |
| 1237 | channel_data *chand; |
| 1238 | grpc_pollset *pollset; |
| 1239 | grpc_closure *on_complete; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1240 | grpc_connectivity_state *state; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1241 | grpc_closure my_closure; |
| 1242 | } external_connectivity_watcher; |
| 1243 | |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1244 | 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] | 1245 | grpc_error *error) { |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1246 | external_connectivity_watcher *w = arg; |
| 1247 | grpc_closure *follow_up = w->on_complete; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1248 | grpc_pollset_set_del_pollset(exec_ctx, w->chand->interested_parties, |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1249 | w->pollset); |
| 1250 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, |
| 1251 | "external_connectivity_watcher"); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1252 | gpr_free(w); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1253 | grpc_closure_run(exec_ctx, follow_up, GRPC_ERROR_REF(error)); |
| 1254 | } |
| 1255 | |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 1256 | static void watch_connectivity_state_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 1257 | grpc_error *error_ignored) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1258 | external_connectivity_watcher *w = arg; |
| 1259 | grpc_closure_init(&w->my_closure, on_external_watch_complete, w, |
| 1260 | grpc_schedule_on_exec_ctx); |
| 1261 | grpc_connectivity_state_notify_on_state_change( |
| 1262 | exec_ctx, &w->chand->state_tracker, w->state, &w->my_closure); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1263 | } |
| 1264 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1265 | void grpc_client_channel_watch_connectivity_state( |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1266 | grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, grpc_pollset *pollset, |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1267 | grpc_connectivity_state *state, grpc_closure *on_complete) { |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1268 | channel_data *chand = elem->channel_data; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1269 | external_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
| 1270 | w->chand = chand; |
| 1271 | w->pollset = pollset; |
| 1272 | w->on_complete = on_complete; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1273 | w->state = state; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1274 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, pollset); |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1275 | GRPC_CHANNEL_STACK_REF(w->chand->owning_stack, |
| 1276 | "external_connectivity_watcher"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1277 | grpc_closure_sched( |
| 1278 | exec_ctx, |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame^] | 1279 | grpc_closure_init(&w->my_closure, watch_connectivity_state_locked, w, |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1280 | grpc_combiner_scheduler(chand->combiner, true)), |
| 1281 | GRPC_ERROR_NONE); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1282 | } |