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 | |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 34 | #include "src/core/ext/filters/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 | |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 46 | #include "src/core/ext/filters/client_channel/http_connect_handshaker.h" |
| 47 | #include "src/core/ext/filters/client_channel/lb_policy_registry.h" |
| 48 | #include "src/core/ext/filters/client_channel/proxy_mapper_registry.h" |
| 49 | #include "src/core/ext/filters/client_channel/resolver_registry.h" |
| 50 | #include "src/core/ext/filters/client_channel/retry_throttle.h" |
| 51 | #include "src/core/ext/filters/client_channel/subchannel.h" |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 52 | #include "src/core/ext/filters/deadline/deadline_filter.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 53 | #include "src/core/lib/channel/channel_args.h" |
| 54 | #include "src/core/lib/channel/connected_channel.h" |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 55 | #include "src/core/lib/iomgr/combiner.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 56 | #include "src/core/lib/iomgr/iomgr.h" |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 57 | #include "src/core/lib/iomgr/polling_entity.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 58 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 59 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 60 | #include "src/core/lib/support/string.h" |
| 61 | #include "src/core/lib/surface/channel.h" |
| 62 | #include "src/core/lib/transport/connectivity_state.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 63 | #include "src/core/lib/transport/metadata.h" |
| 64 | #include "src/core/lib/transport/metadata_batch.h" |
Mark D. Roth | ea846a0 | 2016-11-03 11:32:54 -0700 | [diff] [blame] | 65 | #include "src/core/lib/transport/service_config.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 66 | #include "src/core/lib/transport/static_metadata.h" |
Craig Tiller | 8910ac6 | 2015-10-08 16:49:15 -0700 | [diff] [blame] | 67 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 68 | /* Client channel implementation */ |
| 69 | |
Mark D. Roth | 26b7be4 | 2016-10-24 10:08:07 -0700 | [diff] [blame] | 70 | /************************************************************************* |
| 71 | * METHOD-CONFIG TABLE |
| 72 | */ |
| 73 | |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 74 | typedef enum { |
Craig Tiller | 7acc37e | 2017-02-28 10:01:37 -0800 | [diff] [blame] | 75 | /* zero so it can be default initialized */ |
| 76 | WAIT_FOR_READY_UNSET = 0, |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 77 | WAIT_FOR_READY_FALSE, |
| 78 | WAIT_FOR_READY_TRUE |
| 79 | } wait_for_ready_value; |
| 80 | |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 81 | typedef struct { |
| 82 | gpr_refcount refs; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 83 | gpr_timespec timeout; |
| 84 | wait_for_ready_value wait_for_ready; |
| 85 | } method_parameters; |
| 86 | |
Mark D. Roth | 722de8d | 2017-02-27 10:50:44 -0800 | [diff] [blame] | 87 | static method_parameters *method_parameters_ref( |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 88 | method_parameters *method_params) { |
| 89 | gpr_ref(&method_params->refs); |
| 90 | return method_params; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 91 | } |
| 92 | |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 93 | static void method_parameters_unref(method_parameters *method_params) { |
| 94 | if (gpr_unref(&method_params->refs)) { |
| 95 | gpr_free(method_params); |
| 96 | } |
| 97 | } |
| 98 | |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 99 | static void method_parameters_free(grpc_exec_ctx *exec_ctx, void *value) { |
| 100 | method_parameters_unref(value); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 101 | } |
| 102 | |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 103 | static bool parse_wait_for_ready(grpc_json *field, |
| 104 | wait_for_ready_value *wait_for_ready) { |
| 105 | if (field->type != GRPC_JSON_TRUE && field->type != GRPC_JSON_FALSE) { |
| 106 | return false; |
| 107 | } |
| 108 | *wait_for_ready = field->type == GRPC_JSON_TRUE ? WAIT_FOR_READY_TRUE |
| 109 | : WAIT_FOR_READY_FALSE; |
| 110 | return true; |
| 111 | } |
| 112 | |
Mark D. Roth | 722de8d | 2017-02-27 10:50:44 -0800 | [diff] [blame] | 113 | static bool parse_timeout(grpc_json *field, gpr_timespec *timeout) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 114 | if (field->type != GRPC_JSON_STRING) return false; |
| 115 | size_t len = strlen(field->value); |
| 116 | if (field->value[len - 1] != 's') return false; |
| 117 | char *buf = gpr_strdup(field->value); |
| 118 | buf[len - 1] = '\0'; // Remove trailing 's'. |
| 119 | char *decimal_point = strchr(buf, '.'); |
| 120 | if (decimal_point != NULL) { |
| 121 | *decimal_point = '\0'; |
| 122 | timeout->tv_nsec = gpr_parse_nonnegative_int(decimal_point + 1); |
| 123 | if (timeout->tv_nsec == -1) { |
| 124 | gpr_free(buf); |
| 125 | return false; |
| 126 | } |
| 127 | // There should always be exactly 3, 6, or 9 fractional digits. |
| 128 | int multiplier = 1; |
| 129 | switch (strlen(decimal_point + 1)) { |
| 130 | case 9: |
| 131 | break; |
| 132 | case 6: |
| 133 | multiplier *= 1000; |
| 134 | break; |
| 135 | case 3: |
| 136 | multiplier *= 1000000; |
| 137 | break; |
| 138 | default: // Unsupported number of digits. |
| 139 | gpr_free(buf); |
| 140 | return false; |
| 141 | } |
| 142 | timeout->tv_nsec *= multiplier; |
| 143 | } |
| 144 | timeout->tv_sec = gpr_parse_nonnegative_int(buf); |
| 145 | gpr_free(buf); |
| 146 | if (timeout->tv_sec == -1) return false; |
| 147 | return true; |
| 148 | } |
| 149 | |
Mark D. Roth | e30baeb | 2016-11-03 08:16:19 -0700 | [diff] [blame] | 150 | static void *method_parameters_create_from_json(const grpc_json *json) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 151 | wait_for_ready_value wait_for_ready = WAIT_FOR_READY_UNSET; |
Mark D. Roth | 47f1084 | 2016-11-03 08:45:27 -0700 | [diff] [blame] | 152 | gpr_timespec timeout = {0, 0, GPR_TIMESPAN}; |
| 153 | for (grpc_json *field = json->child; field != NULL; field = field->next) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 154 | if (field->key == NULL) continue; |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 155 | if (strcmp(field->key, "waitForReady") == 0) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 156 | if (wait_for_ready != WAIT_FOR_READY_UNSET) return NULL; // Duplicate. |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 157 | if (!parse_wait_for_ready(field, &wait_for_ready)) return NULL; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 158 | } else if (strcmp(field->key, "timeout") == 0) { |
| 159 | if (timeout.tv_sec > 0 || timeout.tv_nsec > 0) return NULL; // Duplicate. |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 160 | if (!parse_timeout(field, &timeout)) return NULL; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 161 | } |
| 162 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 163 | method_parameters *value = gpr_malloc(sizeof(method_parameters)); |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 164 | gpr_ref_init(&value->refs, 1); |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 165 | value->timeout = timeout; |
| 166 | value->wait_for_ready = wait_for_ready; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 167 | return value; |
| 168 | } |
| 169 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 170 | /************************************************************************* |
| 171 | * CHANNEL-WIDE FUNCTIONS |
| 172 | */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 173 | |
Craig Tiller | 800dacb | 2015-10-06 09:10:26 -0700 | [diff] [blame] | 174 | typedef struct client_channel_channel_data { |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 175 | /** resolver for this channel */ |
| 176 | grpc_resolver *resolver; |
Craig Tiller | 20a3c35 | 2015-08-05 08:39:50 -0700 | [diff] [blame] | 177 | /** have we started resolving this channel */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 178 | bool started_resolving; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 179 | /** is deadline checking enabled? */ |
| 180 | bool deadline_checking_enabled; |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 181 | /** client channel factory */ |
| 182 | grpc_client_channel_factory *client_channel_factory; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 183 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 184 | /** combiner protecting all variables below in this data structure */ |
| 185 | grpc_combiner *combiner; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 186 | /** currently active load balancer */ |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 187 | grpc_lb_policy *lb_policy; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 188 | /** retry throttle data */ |
| 189 | grpc_server_retry_throttle_data *retry_throttle_data; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 190 | /** maps method names to method_parameters structs */ |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 191 | grpc_slice_hash_table *method_params_table; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 192 | /** incoming resolver result - set by resolver.next() */ |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 193 | grpc_channel_args *resolver_result; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 194 | /** 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] | 195 | grpc_closure_list waiting_for_config_closures; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 196 | /** resolver callback */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 197 | grpc_closure on_resolver_result_changed; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 198 | /** connectivity state being tracked */ |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 199 | grpc_connectivity_state_tracker state_tracker; |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 200 | /** when an lb_policy arrives, should we try to exit idle */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 201 | bool exit_idle_when_lb_policy_arrives; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 202 | /** owning stack */ |
| 203 | grpc_channel_stack *owning_stack; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 204 | /** interested parties (owned) */ |
| 205 | grpc_pollset_set *interested_parties; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 206 | |
| 207 | /* the following properties are guarded by a mutex since API's require them |
Craig Tiller | 46dd790 | 2017-02-23 09:42:16 -0800 | [diff] [blame] | 208 | to be instantaneously available */ |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 209 | gpr_mu info_mu; |
| 210 | char *info_lb_policy_name; |
| 211 | /** service config in JSON form */ |
| 212 | char *info_service_config_json; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 213 | } channel_data; |
| 214 | |
Craig Tiller | d6c98df | 2015-08-18 09:33:44 -0700 | [diff] [blame] | 215 | /** 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] | 216 | resolver, to watch for state changes from the lb_policy. When a state |
| 217 | change is seen, we update the channel, and create a new watcher. */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 218 | typedef struct { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 219 | channel_data *chand; |
Craig Tiller | 3382511 | 2015-09-18 07:44:19 -0700 | [diff] [blame] | 220 | grpc_closure on_changed; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 221 | grpc_connectivity_state state; |
| 222 | grpc_lb_policy *lb_policy; |
| 223 | } lb_policy_connectivity_watcher; |
| 224 | |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 225 | static void watch_lb_policy_locked(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 226 | grpc_lb_policy *lb_policy, |
| 227 | grpc_connectivity_state current_state); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 228 | |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 229 | static void set_channel_connectivity_state_locked(grpc_exec_ctx *exec_ctx, |
| 230 | channel_data *chand, |
| 231 | grpc_connectivity_state state, |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 232 | grpc_error *error, |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 233 | const char *reason) { |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 234 | /* TODO: Improve failure handling: |
| 235 | * - Make it possible for policies to return GRPC_CHANNEL_TRANSIENT_FAILURE. |
| 236 | * - Hand over pending picks from old policies during the switch that happens |
| 237 | * when resolver provides an update. */ |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 238 | if (chand->lb_policy != NULL) { |
| 239 | if (state == GRPC_CHANNEL_TRANSIENT_FAILURE) { |
| 240 | /* cancel picks with wait_for_ready=false */ |
| 241 | grpc_lb_policy_cancel_picks_locked( |
| 242 | exec_ctx, chand->lb_policy, |
| 243 | /* mask= */ GRPC_INITIAL_METADATA_WAIT_FOR_READY, |
| 244 | /* check= */ 0, GRPC_ERROR_REF(error)); |
| 245 | } else if (state == GRPC_CHANNEL_SHUTDOWN) { |
| 246 | /* cancel all picks */ |
| 247 | grpc_lb_policy_cancel_picks_locked(exec_ctx, chand->lb_policy, |
| 248 | /* mask= */ 0, /* check= */ 0, |
| 249 | GRPC_ERROR_REF(error)); |
| 250 | } |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 251 | } |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 252 | grpc_connectivity_state_set(exec_ctx, &chand->state_tracker, state, error, |
| 253 | reason); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 254 | } |
| 255 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 256 | 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] | 257 | void *arg, grpc_error *error) { |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 258 | lb_policy_connectivity_watcher *w = arg; |
Craig Tiller | 5d44c06 | 2015-07-01 08:55:28 -0700 | [diff] [blame] | 259 | grpc_connectivity_state publish_state = w->state; |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 260 | /* check if the notification is for the latest policy */ |
| 261 | if (w->lb_policy == w->chand->lb_policy) { |
| 262 | if (publish_state == GRPC_CHANNEL_SHUTDOWN && w->chand->resolver != NULL) { |
| 263 | publish_state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 264 | grpc_resolver_channel_saw_error_locked(exec_ctx, w->chand->resolver); |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 265 | GRPC_LB_POLICY_UNREF(exec_ctx, w->chand->lb_policy, "channel"); |
| 266 | w->chand->lb_policy = NULL; |
| 267 | } |
| 268 | set_channel_connectivity_state_locked(exec_ctx, w->chand, publish_state, |
| 269 | GRPC_ERROR_REF(error), "lb_changed"); |
| 270 | if (w->state != GRPC_CHANNEL_SHUTDOWN) { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 271 | watch_lb_policy_locked(exec_ctx, w->chand, w->lb_policy, w->state); |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 272 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 273 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 274 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 275 | 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] | 276 | gpr_free(w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 279 | static void watch_lb_policy_locked(grpc_exec_ctx *exec_ctx, channel_data *chand, |
| 280 | grpc_lb_policy *lb_policy, |
| 281 | grpc_connectivity_state current_state) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 282 | lb_policy_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 283 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "watch_lb_policy"); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 284 | |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 285 | w->chand = chand; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 286 | grpc_closure_init(&w->on_changed, on_lb_policy_state_changed_locked, w, |
| 287 | grpc_combiner_scheduler(chand->combiner, false)); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 288 | w->state = current_state; |
| 289 | w->lb_policy = lb_policy; |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 290 | grpc_lb_policy_notify_on_state_change_locked(exec_ctx, lb_policy, &w->state, |
| 291 | &w->on_changed); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 292 | } |
| 293 | |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 294 | typedef struct { |
| 295 | char *server_name; |
| 296 | grpc_server_retry_throttle_data *retry_throttle_data; |
| 297 | } service_config_parsing_state; |
| 298 | |
| 299 | static void parse_retry_throttle_params(const grpc_json *field, void *arg) { |
| 300 | service_config_parsing_state *parsing_state = arg; |
| 301 | if (strcmp(field->key, "retryThrottling") == 0) { |
| 302 | if (parsing_state->retry_throttle_data != NULL) return; // Duplicate. |
| 303 | if (field->type != GRPC_JSON_OBJECT) return; |
| 304 | int max_milli_tokens = 0; |
| 305 | int milli_token_ratio = 0; |
| 306 | for (grpc_json *sub_field = field->child; sub_field != NULL; |
| 307 | sub_field = sub_field->next) { |
Mark D. Roth | b332256 | 2017-02-23 14:38:02 -0800 | [diff] [blame] | 308 | if (sub_field->key == NULL) return; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 309 | if (strcmp(sub_field->key, "maxTokens") == 0) { |
| 310 | if (max_milli_tokens != 0) return; // Duplicate. |
| 311 | if (sub_field->type != GRPC_JSON_NUMBER) return; |
| 312 | max_milli_tokens = gpr_parse_nonnegative_int(sub_field->value); |
| 313 | if (max_milli_tokens == -1) return; |
| 314 | max_milli_tokens *= 1000; |
| 315 | } else if (strcmp(sub_field->key, "tokenRatio") == 0) { |
| 316 | if (milli_token_ratio != 0) return; // Duplicate. |
| 317 | if (sub_field->type != GRPC_JSON_NUMBER) return; |
| 318 | // We support up to 3 decimal digits. |
| 319 | size_t whole_len = strlen(sub_field->value); |
| 320 | uint32_t multiplier = 1; |
| 321 | uint32_t decimal_value = 0; |
| 322 | const char *decimal_point = strchr(sub_field->value, '.'); |
| 323 | if (decimal_point != NULL) { |
| 324 | whole_len = (size_t)(decimal_point - sub_field->value); |
| 325 | multiplier = 1000; |
| 326 | size_t decimal_len = strlen(decimal_point + 1); |
| 327 | if (decimal_len > 3) decimal_len = 3; |
| 328 | if (!gpr_parse_bytes_to_uint32(decimal_point + 1, decimal_len, |
| 329 | &decimal_value)) { |
| 330 | return; |
| 331 | } |
| 332 | uint32_t decimal_multiplier = 1; |
| 333 | for (size_t i = 0; i < (3 - decimal_len); ++i) { |
| 334 | decimal_multiplier *= 10; |
| 335 | } |
| 336 | decimal_value *= decimal_multiplier; |
| 337 | } |
| 338 | uint32_t whole_value; |
| 339 | if (!gpr_parse_bytes_to_uint32(sub_field->value, whole_len, |
| 340 | &whole_value)) { |
| 341 | return; |
| 342 | } |
| 343 | milli_token_ratio = (int)((whole_value * multiplier) + decimal_value); |
Mark D. Roth | b332256 | 2017-02-23 14:38:02 -0800 | [diff] [blame] | 344 | if (milli_token_ratio <= 0) return; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 345 | } |
| 346 | } |
| 347 | parsing_state->retry_throttle_data = |
| 348 | grpc_retry_throttle_map_get_data_for_server( |
| 349 | parsing_state->server_name, max_milli_tokens, milli_token_ratio); |
| 350 | } |
| 351 | } |
| 352 | |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 353 | // Wrap a closure associated with \a lb_policy. The associated callback (\a |
| 354 | // wrapped_on_pick_closure_cb) is responsible for unref'ing \a lb_policy after |
| 355 | // scheduling \a wrapped_closure. |
| 356 | typedef struct wrapped_on_pick_closure_arg { |
| 357 | /* the closure instance using this struct as argument */ |
| 358 | grpc_closure wrapper_closure; |
| 359 | |
| 360 | /* the original closure. Usually a on_complete/notify cb for pick() and ping() |
| 361 | * calls against the internal RR instance, respectively. */ |
| 362 | grpc_closure *wrapped_closure; |
| 363 | |
| 364 | /* The policy instance related to the closure */ |
| 365 | grpc_lb_policy *lb_policy; |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 366 | } wrapped_on_pick_closure_arg; |
| 367 | |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 368 | // Invoke \a arg->wrapped_closure, unref \a arg->lb_policy and free \a arg. |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 369 | static void wrapped_on_pick_closure_cb(grpc_exec_ctx *exec_ctx, void *arg, |
| 370 | grpc_error *error) { |
| 371 | wrapped_on_pick_closure_arg *wc_arg = arg; |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 372 | GPR_ASSERT(wc_arg != NULL); |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 373 | GPR_ASSERT(wc_arg->wrapped_closure != NULL); |
| 374 | GPR_ASSERT(wc_arg->lb_policy != NULL); |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 375 | grpc_closure_run(exec_ctx, wc_arg->wrapped_closure, GRPC_ERROR_REF(error)); |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 376 | GRPC_LB_POLICY_UNREF(exec_ctx, wc_arg->lb_policy, "pick_subchannel_wrapping"); |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 377 | gpr_free(wc_arg); |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 380 | static void on_resolver_result_changed_locked(grpc_exec_ctx *exec_ctx, |
| 381 | void *arg, grpc_error *error) { |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 382 | channel_data *chand = arg; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 383 | char *lb_policy_name = NULL; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 384 | grpc_lb_policy *lb_policy = NULL; |
| 385 | grpc_lb_policy *old_lb_policy; |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 386 | grpc_slice_hash_table *method_params_table = NULL; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 387 | grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 388 | bool exit_idle = false; |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 389 | grpc_error *state_error = |
| 390 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("No load balancing policy"); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 391 | char *service_config_json = NULL; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 392 | service_config_parsing_state parsing_state; |
| 393 | memset(&parsing_state, 0, sizeof(parsing_state)); |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 394 | |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 395 | if (chand->resolver_result != NULL) { |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 396 | // Find LB policy name. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 397 | const grpc_arg *channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 398 | 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] | 399 | if (channel_arg != NULL) { |
| 400 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
| 401 | lb_policy_name = channel_arg->value.string; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 402 | } |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 403 | // Special case: If at least one balancer address is present, we use |
| 404 | // the grpclb policy, regardless of what the resolver actually specified. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 405 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 406 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_LB_ADDRESSES); |
David Garcia Quintas | 143cb77 | 2017-03-31 13:39:27 -0700 | [diff] [blame] | 407 | if (channel_arg != NULL && channel_arg->type == GRPC_ARG_POINTER) { |
Mark D. Roth | 557c990 | 2016-10-24 11:12:05 -0700 | [diff] [blame] | 408 | grpc_lb_addresses *addresses = channel_arg->value.pointer.p; |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 409 | bool found_balancer_address = false; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 410 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 411 | if (addresses->addresses[i].is_balancer) { |
| 412 | found_balancer_address = true; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 413 | break; |
| 414 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 415 | } |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 416 | if (found_balancer_address) { |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 417 | if (lb_policy_name != NULL && strcmp(lb_policy_name, "grpclb") != 0) { |
| 418 | gpr_log(GPR_INFO, |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 419 | "resolver requested LB policy %s but provided at least one " |
| 420 | "balancer address -- forcing use of grpclb LB policy", |
Mark D. Roth | 5f40e5d | 2016-10-24 13:09:05 -0700 | [diff] [blame] | 421 | lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 422 | } |
| 423 | lb_policy_name = "grpclb"; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 424 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 425 | } |
| 426 | // Use pick_first if nothing was specified and we didn't select grpclb |
| 427 | // above. |
| 428 | if (lb_policy_name == NULL) lb_policy_name = "pick_first"; |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 429 | // Instantiate LB policy. |
| 430 | grpc_lb_policy_args lb_policy_args; |
| 431 | lb_policy_args.args = chand->resolver_result; |
| 432 | lb_policy_args.client_channel_factory = chand->client_channel_factory; |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 433 | lb_policy_args.combiner = chand->combiner; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 434 | lb_policy = |
| 435 | grpc_lb_policy_create(exec_ctx, lb_policy_name, &lb_policy_args); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 436 | if (lb_policy != NULL) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 437 | GRPC_LB_POLICY_REF(lb_policy, "config_change"); |
Craig Tiller | f707d62 | 2016-05-06 14:26:12 -0700 | [diff] [blame] | 438 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 439 | state = grpc_lb_policy_check_connectivity_locked(exec_ctx, lb_policy, |
| 440 | &state_error); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 441 | } |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 442 | // Find service config. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 443 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 444 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_SERVICE_CONFIG); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 445 | if (channel_arg != NULL) { |
Mark D. Roth | 9ec28af | 2016-11-03 12:32:39 -0700 | [diff] [blame] | 446 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 447 | service_config_json = gpr_strdup(channel_arg->value.string); |
Mark D. Roth | 70a1abd | 2016-11-04 09:26:37 -0700 | [diff] [blame] | 448 | grpc_service_config *service_config = |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 449 | grpc_service_config_create(service_config_json); |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 450 | if (service_config != NULL) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 451 | channel_arg = |
| 452 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_SERVER_URI); |
| 453 | GPR_ASSERT(channel_arg != NULL); |
| 454 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 455 | grpc_uri *uri = |
| 456 | grpc_uri_parse(exec_ctx, channel_arg->value.string, true); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 457 | GPR_ASSERT(uri->path[0] != '\0'); |
| 458 | parsing_state.server_name = |
| 459 | uri->path[0] == '/' ? uri->path + 1 : uri->path; |
| 460 | grpc_service_config_parse_global_params( |
| 461 | service_config, parse_retry_throttle_params, &parsing_state); |
| 462 | parsing_state.server_name = NULL; |
| 463 | grpc_uri_destroy(uri); |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 464 | method_params_table = grpc_service_config_create_method_config_table( |
Craig Tiller | b28c7e8 | 2016-11-18 10:29:04 -0800 | [diff] [blame] | 465 | exec_ctx, service_config, method_parameters_create_from_json, |
Mark D. Roth | e300670 | 2017-04-19 07:43:56 -0700 | [diff] [blame] | 466 | method_parameters_free); |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 467 | grpc_service_config_destroy(service_config); |
| 468 | } |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 469 | } |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 470 | // Before we clean up, save a copy of lb_policy_name, since it might |
| 471 | // be pointing to data inside chand->resolver_result. |
| 472 | // The copy will be saved in chand->lb_policy_name below. |
| 473 | lb_policy_name = gpr_strdup(lb_policy_name); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 474 | grpc_channel_args_destroy(exec_ctx, chand->resolver_result); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 475 | chand->resolver_result = NULL; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 476 | } |
| 477 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 478 | if (lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 479 | grpc_pollset_set_add_pollset_set(exec_ctx, lb_policy->interested_parties, |
| 480 | chand->interested_parties); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 481 | } |
| 482 | |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 483 | gpr_mu_lock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 484 | if (lb_policy_name != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 485 | gpr_free(chand->info_lb_policy_name); |
| 486 | chand->info_lb_policy_name = lb_policy_name; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 487 | } |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 488 | old_lb_policy = chand->lb_policy; |
| 489 | chand->lb_policy = lb_policy; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 490 | if (service_config_json != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 491 | gpr_free(chand->info_service_config_json); |
| 492 | chand->info_service_config_json = service_config_json; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 493 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 494 | gpr_mu_unlock(&chand->info_mu); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 495 | |
| 496 | if (chand->retry_throttle_data != NULL) { |
| 497 | grpc_server_retry_throttle_data_unref(chand->retry_throttle_data); |
| 498 | } |
| 499 | chand->retry_throttle_data = parsing_state.retry_throttle_data; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 500 | if (chand->method_params_table != NULL) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 501 | grpc_slice_hash_table_unref(exec_ctx, chand->method_params_table); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 502 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 503 | chand->method_params_table = method_params_table; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 504 | if (lb_policy != NULL) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 505 | grpc_closure_list_sched(exec_ctx, &chand->waiting_for_config_closures); |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 506 | } else if (chand->resolver == NULL /* disconnected */) { |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 507 | grpc_closure_list_fail_all(&chand->waiting_for_config_closures, |
| 508 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 509 | "Channel disconnected", &error, 1)); |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 510 | grpc_closure_list_sched(exec_ctx, &chand->waiting_for_config_closures); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 511 | } |
| 512 | if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) { |
| 513 | GRPC_LB_POLICY_REF(lb_policy, "exit_idle"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 514 | exit_idle = true; |
| 515 | chand->exit_idle_when_lb_policy_arrives = false; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 516 | } |
Craig Tiller | 9846503 | 2015-06-29 14:36:42 -0700 | [diff] [blame] | 517 | |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 518 | if (error == GRPC_ERROR_NONE && chand->resolver) { |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 519 | set_channel_connectivity_state_locked( |
| 520 | exec_ctx, chand, state, GRPC_ERROR_REF(state_error), "new_lb+resolver"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 521 | if (lb_policy != NULL) { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 522 | watch_lb_policy_locked(exec_ctx, chand, lb_policy, state); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 523 | } |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 524 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 525 | grpc_resolver_next_locked(exec_ctx, chand->resolver, |
| 526 | &chand->resolver_result, |
| 527 | &chand->on_resolver_result_changed); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 528 | } else { |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 529 | if (chand->resolver != NULL) { |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 530 | grpc_resolver_shutdown_locked(exec_ctx, chand->resolver); |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 531 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 532 | chand->resolver = NULL; |
| 533 | } |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 534 | grpc_error *refs[] = {error, state_error}; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 535 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 536 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 537 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 538 | "Got config after disconnection", refs, GPR_ARRAY_SIZE(refs)), |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 539 | "resolver_gone"); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 540 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 541 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 542 | if (exit_idle) { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 543 | grpc_lb_policy_exit_idle_locked(exec_ctx, lb_policy); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 544 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "exit_idle"); |
| 545 | } |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 546 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 547 | if (old_lb_policy != NULL) { |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 548 | grpc_pollset_set_del_pollset_set( |
| 549 | exec_ctx, old_lb_policy->interested_parties, chand->interested_parties); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 550 | GRPC_LB_POLICY_UNREF(exec_ctx, old_lb_policy, "channel"); |
| 551 | } |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 552 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 553 | if (lb_policy != NULL) { |
| 554 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "config_change"); |
| 555 | } |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 556 | |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 557 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver"); |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 558 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 559 | } |
| 560 | |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame] | 561 | static void start_transport_op_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 562 | grpc_error *error_ignored) { |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 563 | grpc_transport_op *op = arg; |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 564 | grpc_channel_element *elem = op->handler_private.extra_arg; |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 565 | channel_data *chand = elem->channel_data; |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 566 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 567 | if (op->on_connectivity_state_change != NULL) { |
| 568 | grpc_connectivity_state_notify_on_state_change( |
| 569 | exec_ctx, &chand->state_tracker, op->connectivity_state, |
| 570 | op->on_connectivity_state_change); |
| 571 | op->on_connectivity_state_change = NULL; |
| 572 | op->connectivity_state = NULL; |
| 573 | } |
| 574 | |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 575 | if (op->send_ping != NULL) { |
Craig Tiller | 87b71e2 | 2015-12-07 15:14:14 -0800 | [diff] [blame] | 576 | if (chand->lb_policy == NULL) { |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 577 | grpc_closure_sched( |
| 578 | exec_ctx, op->send_ping, |
| 579 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("Ping with no load balancing")); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 580 | } else { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 581 | grpc_lb_policy_ping_one_locked(exec_ctx, chand->lb_policy, op->send_ping); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 582 | op->bind_pollset = NULL; |
| 583 | } |
| 584 | op->send_ping = NULL; |
| 585 | } |
| 586 | |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 587 | if (op->disconnect_with_error != GRPC_ERROR_NONE) { |
| 588 | if (chand->resolver != NULL) { |
| 589 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 590 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 591 | GRPC_ERROR_REF(op->disconnect_with_error), "disconnect"); |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 592 | grpc_resolver_shutdown_locked(exec_ctx, chand->resolver); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 593 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
| 594 | chand->resolver = NULL; |
| 595 | if (!chand->started_resolving) { |
| 596 | grpc_closure_list_fail_all(&chand->waiting_for_config_closures, |
| 597 | GRPC_ERROR_REF(op->disconnect_with_error)); |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 598 | grpc_closure_list_sched(exec_ctx, &chand->waiting_for_config_closures); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 599 | } |
| 600 | if (chand->lb_policy != NULL) { |
| 601 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 602 | chand->lb_policy->interested_parties, |
| 603 | chand->interested_parties); |
| 604 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 605 | chand->lb_policy = NULL; |
| 606 | } |
Craig Tiller | b12d22a | 2016-04-23 12:50:21 -0700 | [diff] [blame] | 607 | } |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 608 | GRPC_ERROR_UNREF(op->disconnect_with_error); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 609 | } |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 610 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "start_transport_op"); |
| 611 | |
| 612 | grpc_closure_sched(exec_ctx, op->on_consumed, GRPC_ERROR_NONE); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | static void cc_start_transport_op(grpc_exec_ctx *exec_ctx, |
| 616 | grpc_channel_element *elem, |
| 617 | grpc_transport_op *op) { |
| 618 | channel_data *chand = elem->channel_data; |
| 619 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 620 | GPR_ASSERT(op->set_accept_stream == false); |
| 621 | if (op->bind_pollset != NULL) { |
| 622 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, |
| 623 | op->bind_pollset); |
| 624 | } |
| 625 | |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 626 | op->handler_private.extra_arg = elem; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 627 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "start_transport_op"); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 628 | grpc_closure_sched( |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 629 | exec_ctx, |
| 630 | grpc_closure_init(&op->handler_private.closure, start_transport_op_locked, |
| 631 | op, grpc_combiner_scheduler(chand->combiner, false)), |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 632 | GRPC_ERROR_NONE); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 633 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 634 | |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 635 | static void cc_get_channel_info(grpc_exec_ctx *exec_ctx, |
| 636 | grpc_channel_element *elem, |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 637 | const grpc_channel_info *info) { |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 638 | channel_data *chand = elem->channel_data; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 639 | gpr_mu_lock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 640 | if (info->lb_policy_name != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 641 | *info->lb_policy_name = chand->info_lb_policy_name == NULL |
Mark D. Roth | 78afd77 | 2016-11-04 12:49:49 -0700 | [diff] [blame] | 642 | ? NULL |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 643 | : gpr_strdup(chand->info_lb_policy_name); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 644 | } |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 645 | if (info->service_config_json != NULL) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 646 | *info->service_config_json = |
| 647 | chand->info_service_config_json == NULL |
| 648 | ? NULL |
| 649 | : gpr_strdup(chand->info_service_config_json); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 650 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 651 | gpr_mu_unlock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 654 | /* Constructor for channel_data */ |
Mark D. Roth | c108788 | 2016-11-18 10:54:45 -0800 | [diff] [blame] | 655 | 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] | 656 | grpc_channel_element *elem, |
| 657 | grpc_channel_element_args *args) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 658 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 659 | GPR_ASSERT(args->is_last); |
| 660 | GPR_ASSERT(elem->filter == &grpc_client_channel_filter); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 661 | // Initialize data members. |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 662 | chand->combiner = grpc_combiner_create(NULL); |
Craig Tiller | d8547751 | 2017-02-09 12:02:39 -0800 | [diff] [blame] | 663 | gpr_mu_init(&chand->info_mu); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 664 | chand->owning_stack = args->channel_stack; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 665 | grpc_closure_init(&chand->on_resolver_result_changed, |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 666 | on_resolver_result_changed_locked, chand, |
| 667 | grpc_combiner_scheduler(chand->combiner, false)); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 668 | chand->interested_parties = grpc_pollset_set_create(); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 669 | grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE, |
| 670 | "client_channel"); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 671 | // Record client channel factory. |
| 672 | const grpc_arg *arg = grpc_channel_args_find(args->channel_args, |
| 673 | GRPC_ARG_CLIENT_CHANNEL_FACTORY); |
David Garcia Quintas | 228a514 | 2017-03-30 19:43:00 -0700 | [diff] [blame] | 674 | if (arg == NULL) { |
| 675 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 676 | "Missing client channel factory in args for client channel filter"); |
| 677 | } |
| 678 | if (arg->type != GRPC_ARG_POINTER) { |
| 679 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 680 | "client channel factory arg must be a pointer"); |
| 681 | } |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 682 | grpc_client_channel_factory_ref(arg->value.pointer.p); |
| 683 | chand->client_channel_factory = arg->value.pointer.p; |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 684 | // Get server name to resolve, using proxy mapper if needed. |
Mark D. Roth | 86e9059 | 2016-11-18 09:56:40 -0800 | [diff] [blame] | 685 | arg = grpc_channel_args_find(args->channel_args, GRPC_ARG_SERVER_URI); |
David Garcia Quintas | 228a514 | 2017-03-30 19:43:00 -0700 | [diff] [blame] | 686 | if (arg == NULL) { |
| 687 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 688 | "Missing server uri in args for client channel filter"); |
| 689 | } |
| 690 | if (arg->type != GRPC_ARG_STRING) { |
| 691 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 692 | "server uri arg must be a string"); |
| 693 | } |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 694 | char *proxy_name = NULL; |
| 695 | grpc_channel_args *new_args = NULL; |
| 696 | grpc_proxy_mappers_map_name(exec_ctx, arg->value.string, args->channel_args, |
| 697 | &proxy_name, &new_args); |
| 698 | // Instantiate resolver. |
Mark D. Roth | 45ccec5 | 2017-01-18 14:04:01 -0800 | [diff] [blame] | 699 | chand->resolver = grpc_resolver_create( |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 700 | exec_ctx, proxy_name != NULL ? proxy_name : arg->value.string, |
| 701 | new_args != NULL ? new_args : args->channel_args, |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 702 | chand->interested_parties, chand->combiner); |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 703 | if (proxy_name != NULL) gpr_free(proxy_name); |
| 704 | 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] | 705 | if (chand->resolver == NULL) { |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 706 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING("resolver creation failed"); |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame] | 707 | } |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 708 | chand->deadline_checking_enabled = |
| 709 | grpc_deadline_checking_enabled(args->channel_args); |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame] | 710 | return GRPC_ERROR_NONE; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 711 | } |
| 712 | |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 713 | static void shutdown_resolver_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 714 | grpc_error *error) { |
| 715 | grpc_resolver *resolver = arg; |
| 716 | grpc_resolver_shutdown_locked(exec_ctx, resolver); |
| 717 | GRPC_RESOLVER_UNREF(exec_ctx, resolver, "channel"); |
| 718 | } |
| 719 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 720 | /* Destructor for channel_data */ |
| 721 | static void cc_destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| 722 | grpc_channel_element *elem) { |
| 723 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 724 | if (chand->resolver != NULL) { |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 725 | grpc_closure_sched( |
| 726 | exec_ctx, |
| 727 | grpc_closure_create(shutdown_resolver_locked, chand->resolver, |
| 728 | grpc_combiner_scheduler(chand->combiner, false)), |
| 729 | GRPC_ERROR_NONE); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 730 | } |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 731 | if (chand->client_channel_factory != NULL) { |
| 732 | grpc_client_channel_factory_unref(exec_ctx, chand->client_channel_factory); |
| 733 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 734 | if (chand->lb_policy != NULL) { |
| 735 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 736 | chand->lb_policy->interested_parties, |
| 737 | chand->interested_parties); |
| 738 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 739 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 740 | gpr_free(chand->info_lb_policy_name); |
| 741 | gpr_free(chand->info_service_config_json); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 742 | if (chand->retry_throttle_data != NULL) { |
| 743 | grpc_server_retry_throttle_data_unref(chand->retry_throttle_data); |
| 744 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 745 | if (chand->method_params_table != NULL) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 746 | grpc_slice_hash_table_unref(exec_ctx, chand->method_params_table); |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 747 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 748 | grpc_connectivity_state_destroy(exec_ctx, &chand->state_tracker); |
Craig Tiller | 9e5ac1b | 2017-02-14 22:25:50 -0800 | [diff] [blame] | 749 | grpc_pollset_set_destroy(exec_ctx, chand->interested_parties); |
Craig Tiller | f102167 | 2017-02-09 21:29:50 -0800 | [diff] [blame] | 750 | GRPC_COMBINER_UNREF(exec_ctx, chand->combiner, "client_channel"); |
Craig Tiller | d8547751 | 2017-02-09 12:02:39 -0800 | [diff] [blame] | 751 | gpr_mu_destroy(&chand->info_mu); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | /************************************************************************* |
| 755 | * PER-CALL FUNCTIONS |
| 756 | */ |
| 757 | |
| 758 | #define GET_CALL(call_data) \ |
| 759 | ((grpc_subchannel_call *)(gpr_atm_acq_load(&(call_data)->subchannel_call))) |
| 760 | |
| 761 | #define CANCELLED_CALL ((grpc_subchannel_call *)1) |
| 762 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 763 | /** Call data. Holds a pointer to grpc_subchannel_call and the |
| 764 | associated machinery to create such a pointer. |
| 765 | Handles queueing of stream ops until a call object is ready, waiting |
| 766 | for initial metadata before trying to create a call object, |
| 767 | and handling cancellation gracefully. */ |
| 768 | typedef struct client_channel_call_data { |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 769 | // State for handling deadlines. |
| 770 | // 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] | 771 | // TODO(roth): This is slightly sub-optimal in that grpc_deadline_state |
| 772 | // and this struct both independently store a pointer to the call |
| 773 | // 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] | 774 | // to avoid this without breaking the grpc_deadline_state abstraction. |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 775 | grpc_deadline_state deadline_state; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 776 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 777 | grpc_slice path; // Request path. |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 778 | gpr_timespec call_start_time; |
| 779 | gpr_timespec deadline; |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 780 | grpc_server_retry_throttle_data *retry_throttle_data; |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 781 | method_parameters *method_params; |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 782 | |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 783 | grpc_error *cancel_error; |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 784 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 785 | /** either 0 for no call, 1 for cancelled, or a pointer to a |
| 786 | grpc_subchannel_call */ |
| 787 | gpr_atm subchannel_call; |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 788 | gpr_arena *arena; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 789 | |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 790 | bool pick_pending; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 791 | grpc_connected_subchannel *connected_subchannel; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 792 | grpc_call_context_element subchannel_call_context[GRPC_CONTEXT_COUNT]; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 793 | grpc_polling_entity *pollent; |
| 794 | |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 795 | grpc_transport_stream_op_batch **waiting_ops; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 796 | size_t waiting_ops_count; |
| 797 | size_t waiting_ops_capacity; |
| 798 | |
| 799 | grpc_closure next_step; |
| 800 | |
| 801 | grpc_call_stack *owning_call; |
David Garcia Quintas | d1a47f1 | 2016-09-02 12:46:44 +0200 | [diff] [blame] | 802 | |
| 803 | grpc_linked_mdelem lb_token_mdelem; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 804 | |
| 805 | grpc_closure on_complete; |
| 806 | grpc_closure *original_on_complete; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 807 | } call_data; |
| 808 | |
Craig Tiller | 8b1d59c | 2016-12-27 15:15:30 -0800 | [diff] [blame] | 809 | grpc_subchannel_call *grpc_client_channel_get_subchannel_call( |
| 810 | grpc_call_element *call_elem) { |
| 811 | grpc_subchannel_call *scc = GET_CALL((call_data *)call_elem->call_data); |
| 812 | return scc == CANCELLED_CALL ? NULL : scc; |
| 813 | } |
| 814 | |
Craig Tiller | e1b51da | 2017-03-31 15:44:33 -0700 | [diff] [blame] | 815 | static void add_waiting_locked(call_data *calld, |
| 816 | grpc_transport_stream_op_batch *op) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 817 | GPR_TIMER_BEGIN("add_waiting_locked", 0); |
| 818 | if (calld->waiting_ops_count == calld->waiting_ops_capacity) { |
| 819 | calld->waiting_ops_capacity = GPR_MAX(3, 2 * calld->waiting_ops_capacity); |
| 820 | calld->waiting_ops = |
| 821 | gpr_realloc(calld->waiting_ops, |
| 822 | calld->waiting_ops_capacity * sizeof(*calld->waiting_ops)); |
| 823 | } |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 824 | calld->waiting_ops[calld->waiting_ops_count++] = op; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 825 | GPR_TIMER_END("add_waiting_locked", 0); |
| 826 | } |
| 827 | |
| 828 | static void fail_locked(grpc_exec_ctx *exec_ctx, call_data *calld, |
| 829 | grpc_error *error) { |
| 830 | size_t i; |
| 831 | for (i = 0; i < calld->waiting_ops_count; i++) { |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 832 | grpc_transport_stream_op_batch_finish_with_failure( |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 833 | exec_ctx, calld->waiting_ops[i], GRPC_ERROR_REF(error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 834 | } |
| 835 | calld->waiting_ops_count = 0; |
| 836 | GRPC_ERROR_UNREF(error); |
| 837 | } |
| 838 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 839 | 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] | 840 | if (calld->waiting_ops_count == 0) { |
| 841 | return; |
| 842 | } |
| 843 | |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 844 | grpc_subchannel_call *call = GET_CALL(calld); |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 845 | grpc_transport_stream_op_batch **ops = calld->waiting_ops; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 846 | size_t nops = calld->waiting_ops_count; |
| 847 | if (call == CANCELLED_CALL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 848 | fail_locked(exec_ctx, calld, GRPC_ERROR_CANCELLED); |
| 849 | return; |
| 850 | } |
| 851 | calld->waiting_ops = NULL; |
| 852 | calld->waiting_ops_count = 0; |
| 853 | calld->waiting_ops_capacity = 0; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 854 | for (size_t i = 0; i < nops; i++) { |
| 855 | grpc_subchannel_call_process_op(exec_ctx, call, ops[i]); |
| 856 | } |
Craig Tiller | 9efea88 | 2017-02-09 13:06:52 -0800 | [diff] [blame] | 857 | gpr_free(ops); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 858 | } |
| 859 | |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 860 | // Sets calld->method_params and calld->retry_throttle_data. |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 861 | // If the method params specify a timeout, populates |
| 862 | // *per_method_deadline and returns true. |
| 863 | static bool set_call_method_params_from_service_config_locked( |
| 864 | grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 865 | gpr_timespec *per_method_deadline) { |
| 866 | channel_data *chand = elem->channel_data; |
| 867 | call_data *calld = elem->call_data; |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 868 | if (chand->retry_throttle_data != NULL) { |
| 869 | calld->retry_throttle_data = |
| 870 | grpc_server_retry_throttle_data_ref(chand->retry_throttle_data); |
| 871 | } |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 872 | if (chand->method_params_table != NULL) { |
| 873 | calld->method_params = grpc_method_config_table_get( |
| 874 | exec_ctx, chand->method_params_table, calld->path); |
| 875 | if (calld->method_params != NULL) { |
| 876 | method_parameters_ref(calld->method_params); |
| 877 | if (gpr_time_cmp(calld->method_params->timeout, |
| 878 | gpr_time_0(GPR_TIMESPAN)) != 0) { |
| 879 | *per_method_deadline = |
| 880 | gpr_time_add(calld->call_start_time, calld->method_params->timeout); |
| 881 | return true; |
| 882 | } |
| 883 | } |
| 884 | } |
| 885 | return false; |
| 886 | } |
Craig Tiller | ea4a4f1 | 2017-03-13 13:36:52 -0700 | [diff] [blame] | 887 | |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 888 | static void apply_final_configuration_locked(grpc_exec_ctx *exec_ctx, |
| 889 | grpc_call_element *elem) { |
| 890 | /* apply service-config level configuration to the call (now that we're |
| 891 | * certain it exists) */ |
| 892 | call_data *calld = elem->call_data; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 893 | channel_data *chand = elem->channel_data; |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 894 | gpr_timespec per_method_deadline; |
| 895 | if (set_call_method_params_from_service_config_locked(exec_ctx, elem, |
| 896 | &per_method_deadline)) { |
| 897 | // If the deadline from the service config is shorter than the one |
| 898 | // from the client API, reset the deadline timer. |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 899 | if (chand->deadline_checking_enabled && |
| 900 | gpr_time_cmp(per_method_deadline, calld->deadline) < 0) { |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 901 | calld->deadline = per_method_deadline; |
| 902 | grpc_deadline_state_reset(exec_ctx, elem, calld->deadline); |
| 903 | } |
| 904 | } |
| 905 | } |
| 906 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 907 | static void subchannel_ready_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 908 | grpc_error *error) { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 909 | grpc_call_element *elem = arg; |
| 910 | call_data *calld = elem->call_data; |
| 911 | channel_data *chand = elem->channel_data; |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 912 | GPR_ASSERT(calld->pick_pending); |
| 913 | calld->pick_pending = false; |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 914 | grpc_polling_entity_del_from_pollset_set(exec_ctx, calld->pollent, |
| 915 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 916 | if (calld->connected_subchannel == NULL) { |
| 917 | gpr_atm_no_barrier_store(&calld->subchannel_call, 1); |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 918 | fail_locked(exec_ctx, calld, |
| 919 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 920 | "Failed to create subchannel", &error, 1)); |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 921 | } else if (GET_CALL(calld) == CANCELLED_CALL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 922 | /* already cancelled before subchannel became ready */ |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 923 | grpc_error *cancellation_error = |
| 924 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 925 | "Cancelled before creating subchannel", &error, 1); |
David Garcia Quintas | 68a9e38 | 2016-12-13 10:50:40 -0800 | [diff] [blame] | 926 | /* if due to deadline, attach the deadline exceeded status to the error */ |
| 927 | if (gpr_time_cmp(calld->deadline, gpr_now(GPR_CLOCK_MONOTONIC)) < 0) { |
| 928 | cancellation_error = |
| 929 | grpc_error_set_int(cancellation_error, GRPC_ERROR_INT_GRPC_STATUS, |
| 930 | GRPC_STATUS_DEADLINE_EXCEEDED); |
| 931 | } |
| 932 | fail_locked(exec_ctx, calld, cancellation_error); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 933 | } else { |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 934 | /* Create call on subchannel. */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 935 | grpc_subchannel_call *subchannel_call = NULL; |
Craig Tiller | fb9d112 | 2017-03-14 09:26:27 -0700 | [diff] [blame] | 936 | const grpc_connected_subchannel_call_args call_args = { |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 937 | .pollent = calld->pollent, |
| 938 | .path = calld->path, |
| 939 | .start_time = calld->call_start_time, |
| 940 | .deadline = calld->deadline, |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 941 | .arena = calld->arena, |
| 942 | .context = calld->subchannel_call_context}; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 943 | grpc_error *new_error = grpc_connected_subchannel_create_call( |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 944 | exec_ctx, calld->connected_subchannel, &call_args, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 945 | gpr_atm_rel_store(&calld->subchannel_call, |
| 946 | (gpr_atm)(uintptr_t)subchannel_call); |
Mark D. Roth | 61a6398 | 2017-04-05 09:56:12 -0700 | [diff] [blame] | 947 | if (new_error != GRPC_ERROR_NONE) { |
| 948 | new_error = grpc_error_add_child(new_error, error); |
| 949 | fail_locked(exec_ctx, calld, new_error); |
| 950 | } else { |
| 951 | retry_waiting_locked(exec_ctx, calld); |
| 952 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 953 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 954 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
| 955 | } |
| 956 | |
| 957 | static char *cc_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) { |
| 958 | call_data *calld = elem->call_data; |
| 959 | grpc_subchannel_call *subchannel_call = GET_CALL(calld); |
| 960 | if (subchannel_call == NULL || subchannel_call == CANCELLED_CALL) { |
| 961 | return NULL; |
| 962 | } else { |
| 963 | return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call); |
| 964 | } |
| 965 | } |
| 966 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 967 | typedef struct { |
| 968 | grpc_metadata_batch *initial_metadata; |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 969 | uint32_t initial_metadata_flags; |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 970 | grpc_connected_subchannel **connected_subchannel; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 971 | grpc_call_context_element *subchannel_call_context; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 972 | grpc_closure *on_ready; |
| 973 | grpc_call_element *elem; |
| 974 | grpc_closure closure; |
| 975 | } continue_picking_args; |
| 976 | |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 977 | /** Return true if subchannel is available immediately (in which case on_ready |
| 978 | should not be called), or false otherwise (in which case on_ready should be |
| 979 | called when the subchannel is available). */ |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 980 | static bool pick_subchannel_locked( |
| 981 | grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 982 | grpc_metadata_batch *initial_metadata, uint32_t initial_metadata_flags, |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 983 | grpc_connected_subchannel **connected_subchannel, |
Mark D. Roth | b7e6fa5 | 2017-05-02 15:01:29 -0700 | [diff] [blame] | 984 | grpc_call_context_element *subchannel_call_context, grpc_closure *on_ready); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 985 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 986 | static void continue_picking_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 987 | grpc_error *error) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 988 | continue_picking_args *cpa = arg; |
Craig Tiller | 0ede545 | 2016-04-23 12:21:45 -0700 | [diff] [blame] | 989 | if (cpa->connected_subchannel == NULL) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 990 | /* cancelled, do nothing */ |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 991 | } else if (error != GRPC_ERROR_NONE) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 992 | 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] | 993 | } else { |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 994 | if (pick_subchannel_locked( |
| 995 | exec_ctx, cpa->elem, cpa->initial_metadata, |
| 996 | cpa->initial_metadata_flags, cpa->connected_subchannel, |
Mark D. Roth | b7e6fa5 | 2017-05-02 15:01:29 -0700 | [diff] [blame] | 997 | cpa->subchannel_call_context, cpa->on_ready)) { |
Craig Tiller | 91031da | 2016-12-28 15:44:25 -0800 | [diff] [blame] | 998 | grpc_closure_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_NONE); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 999 | } |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1000 | } |
| 1001 | gpr_free(cpa); |
| 1002 | } |
| 1003 | |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1004 | static void cancel_pick_locked(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 1005 | grpc_error *error) { |
| 1006 | channel_data *chand = elem->channel_data; |
| 1007 | call_data *calld = elem->call_data; |
| 1008 | if (chand->lb_policy != NULL) { |
| 1009 | grpc_lb_policy_cancel_pick_locked(exec_ctx, chand->lb_policy, |
| 1010 | &calld->connected_subchannel, |
| 1011 | GRPC_ERROR_REF(error)); |
| 1012 | } |
| 1013 | for (grpc_closure *closure = chand->waiting_for_config_closures.head; |
| 1014 | closure != NULL; closure = closure->next_data.next) { |
| 1015 | continue_picking_args *cpa = closure->cb_arg; |
| 1016 | if (cpa->connected_subchannel == &calld->connected_subchannel) { |
| 1017 | cpa->connected_subchannel = NULL; |
| 1018 | grpc_closure_sched(exec_ctx, cpa->on_ready, |
| 1019 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 1020 | "Pick cancelled", &error, 1)); |
| 1021 | } |
| 1022 | } |
| 1023 | GRPC_ERROR_UNREF(error); |
| 1024 | } |
| 1025 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1026 | static bool pick_subchannel_locked( |
| 1027 | grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 1028 | grpc_metadata_batch *initial_metadata, uint32_t initial_metadata_flags, |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1029 | grpc_connected_subchannel **connected_subchannel, |
Mark D. Roth | b7e6fa5 | 2017-05-02 15:01:29 -0700 | [diff] [blame] | 1030 | grpc_call_context_element *subchannel_call_context, |
| 1031 | grpc_closure *on_ready) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1032 | GPR_TIMER_BEGIN("pick_subchannel", 0); |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 1033 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1034 | channel_data *chand = elem->channel_data; |
| 1035 | call_data *calld = elem->call_data; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1036 | |
Craig Tiller | b5585d4 | 2015-11-17 07:18:31 -0800 | [diff] [blame] | 1037 | GPR_ASSERT(connected_subchannel); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1038 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1039 | if (chand->lb_policy != NULL) { |
Craig Tiller | 2e0788a | 2017-03-14 06:55:44 -0700 | [diff] [blame] | 1040 | apply_final_configuration_locked(exec_ctx, elem); |
Craig Tiller | 86c0f8a | 2015-12-01 20:05:40 -0800 | [diff] [blame] | 1041 | grpc_lb_policy *lb_policy = chand->lb_policy; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1042 | GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel"); |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1043 | // If the application explicitly set wait_for_ready, use that. |
| 1044 | // Otherwise, if the service config specified a value for this |
| 1045 | // method, use that. |
Mark D. Roth | c1c3858 | 2016-10-11 11:03:27 -0700 | [diff] [blame] | 1046 | const bool wait_for_ready_set_from_api = |
| 1047 | initial_metadata_flags & |
| 1048 | GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET; |
| 1049 | const bool wait_for_ready_set_from_service_config = |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 1050 | calld->method_params != NULL && |
| 1051 | calld->method_params->wait_for_ready != WAIT_FOR_READY_UNSET; |
Mark D. Roth | c1c3858 | 2016-10-11 11:03:27 -0700 | [diff] [blame] | 1052 | if (!wait_for_ready_set_from_api && |
| 1053 | wait_for_ready_set_from_service_config) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 1054 | if (calld->method_params->wait_for_ready == WAIT_FOR_READY_TRUE) { |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1055 | initial_metadata_flags |= GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 1056 | } else { |
| 1057 | initial_metadata_flags &= ~GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 1058 | } |
| 1059 | } |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 1060 | const grpc_lb_policy_pick_args inputs = { |
Yuchen Zeng | ac8bc42 | 2016-10-05 14:00:02 -0700 | [diff] [blame] | 1061 | initial_metadata, initial_metadata_flags, &calld->lb_token_mdelem, |
| 1062 | gpr_inf_future(GPR_CLOCK_MONOTONIC)}; |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 1063 | |
| 1064 | // Wrap the user-provided callback in order to hold a strong reference to |
| 1065 | // the LB policy for the duration of the pick. |
| 1066 | wrapped_on_pick_closure_arg *w_on_pick_arg = |
| 1067 | gpr_zalloc(sizeof(*w_on_pick_arg)); |
| 1068 | grpc_closure_init(&w_on_pick_arg->wrapper_closure, |
| 1069 | wrapped_on_pick_closure_cb, w_on_pick_arg, |
| 1070 | grpc_schedule_on_exec_ctx); |
| 1071 | w_on_pick_arg->wrapped_closure = on_ready; |
| 1072 | GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel_wrapping"); |
| 1073 | w_on_pick_arg->lb_policy = lb_policy; |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 1074 | const bool pick_done = grpc_lb_policy_pick_locked( |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1075 | exec_ctx, lb_policy, &inputs, connected_subchannel, |
| 1076 | subchannel_call_context, NULL, &w_on_pick_arg->wrapper_closure); |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 1077 | if (pick_done) { |
| 1078 | /* synchronous grpc_lb_policy_pick call. Unref the LB policy. */ |
| 1079 | GRPC_LB_POLICY_UNREF(exec_ctx, w_on_pick_arg->lb_policy, |
| 1080 | "pick_subchannel_wrapping"); |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 1081 | gpr_free(w_on_pick_arg); |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 1082 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1083 | GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "pick_subchannel"); |
| 1084 | GPR_TIMER_END("pick_subchannel", 0); |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 1085 | return pick_done; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1086 | } |
| 1087 | if (chand->resolver != NULL && !chand->started_resolving) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1088 | chand->started_resolving = true; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1089 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 1090 | grpc_resolver_next_locked(exec_ctx, chand->resolver, |
| 1091 | &chand->resolver_result, |
| 1092 | &chand->on_resolver_result_changed); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1093 | } |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 1094 | if (chand->resolver != NULL) { |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1095 | continue_picking_args *cpa = gpr_malloc(sizeof(*cpa)); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 1096 | cpa->initial_metadata = initial_metadata; |
| 1097 | cpa->initial_metadata_flags = initial_metadata_flags; |
| 1098 | cpa->connected_subchannel = connected_subchannel; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1099 | cpa->subchannel_call_context = subchannel_call_context; |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 1100 | cpa->on_ready = on_ready; |
| 1101 | cpa->elem = elem; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1102 | grpc_closure_init(&cpa->closure, continue_picking_locked, cpa, |
| 1103 | grpc_combiner_scheduler(chand->combiner, true)); |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 1104 | grpc_closure_list_append(&chand->waiting_for_config_closures, &cpa->closure, |
| 1105 | GRPC_ERROR_NONE); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 1106 | } else { |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 1107 | grpc_closure_sched(exec_ctx, on_ready, |
| 1108 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("Disconnected")); |
Craig Tiller | 0eab697 | 2016-04-23 12:59:57 -0700 | [diff] [blame] | 1109 | } |
Craig Tiller | bfc9adc | 2016-06-27 13:16:22 -0700 | [diff] [blame] | 1110 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1111 | GPR_TIMER_END("pick_subchannel", 0); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1112 | return false; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1113 | } |
| 1114 | |
Craig Tiller | e1b51da | 2017-03-31 15:44:33 -0700 | [diff] [blame] | 1115 | static void start_transport_stream_op_batch_locked_inner( |
| 1116 | grpc_exec_ctx *exec_ctx, grpc_transport_stream_op_batch *op, |
| 1117 | grpc_call_element *elem) { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 1118 | channel_data *chand = elem->channel_data; |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1119 | call_data *calld = elem->call_data; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1120 | grpc_subchannel_call *call; |
| 1121 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1122 | /* need to recheck that another thread hasn't set the call */ |
| 1123 | call = GET_CALL(calld); |
| 1124 | if (call == CANCELLED_CALL) { |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1125 | grpc_transport_stream_op_batch_finish_with_failure( |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1126 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1127 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1128 | return; |
| 1129 | } |
| 1130 | if (call != NULL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1131 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1132 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1133 | return; |
| 1134 | } |
| 1135 | /* if this is a cancellation, then we can raise our cancelled flag */ |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 1136 | if (op->cancel_stream) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1137 | if (!gpr_atm_rel_cas(&calld->subchannel_call, 0, |
| 1138 | (gpr_atm)(uintptr_t)CANCELLED_CALL)) { |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1139 | /* recurse to retry */ |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1140 | start_transport_stream_op_batch_locked_inner(exec_ctx, op, elem); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1141 | /* early out */ |
| 1142 | return; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1143 | } else { |
Craig Tiller | be9691a | 2017-02-14 10:00:42 -0800 | [diff] [blame] | 1144 | /* Stash a copy of cancel_error in our call data, so that we can use |
| 1145 | it for subsequent operations. This ensures that if the call is |
| 1146 | cancelled before any ops are passed down (e.g., if the deadline |
| 1147 | is in the past when the call starts), we can return the right |
| 1148 | error to the caller when the first op does get passed down. */ |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 1149 | calld->cancel_error = |
| 1150 | GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error); |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1151 | if (calld->pick_pending) { |
| 1152 | cancel_pick_locked( |
| 1153 | exec_ctx, elem, |
| 1154 | GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); |
| 1155 | } else { |
| 1156 | fail_locked(exec_ctx, calld, |
| 1157 | GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1158 | } |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1159 | grpc_transport_stream_op_batch_finish_with_failure( |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 1160 | exec_ctx, op, |
| 1161 | GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1162 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1163 | return; |
| 1164 | } |
| 1165 | } |
| 1166 | /* if we don't have a subchannel, try to get one */ |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1167 | if (!calld->pick_pending && calld->connected_subchannel == NULL && |
| 1168 | op->send_initial_metadata) { |
| 1169 | calld->pick_pending = true; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1170 | grpc_closure_init(&calld->next_step, subchannel_ready_locked, elem, |
| 1171 | grpc_combiner_scheduler(chand->combiner, true)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1172 | GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel"); |
Yuchen Zeng | 144ce65 | 2016-09-01 18:19:34 -0700 | [diff] [blame] | 1173 | /* If a subchannel is not available immediately, the polling entity from |
| 1174 | call_data should be provided to channel_data's interested_parties, so |
| 1175 | that IO of the lb_policy and resolver could be done under it. */ |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 1176 | if (pick_subchannel_locked( |
| 1177 | exec_ctx, elem, |
| 1178 | op->payload->send_initial_metadata.send_initial_metadata, |
| 1179 | op->payload->send_initial_metadata.send_initial_metadata_flags, |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1180 | &calld->connected_subchannel, calld->subchannel_call_context, |
Mark D. Roth | b7e6fa5 | 2017-05-02 15:01:29 -0700 | [diff] [blame] | 1181 | &calld->next_step)) { |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1182 | calld->pick_pending = false; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1183 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 1184 | } else { |
Yuchen Zeng | 19656b1 | 2016-09-01 18:00:45 -0700 | [diff] [blame] | 1185 | grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent, |
| 1186 | chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1187 | } |
| 1188 | } |
| 1189 | /* if we've got a subchannel, then let's ask it to create a call */ |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1190 | if (!calld->pick_pending && calld->connected_subchannel != NULL) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1191 | grpc_subchannel_call *subchannel_call = NULL; |
Craig Tiller | fb9d112 | 2017-03-14 09:26:27 -0700 | [diff] [blame] | 1192 | const grpc_connected_subchannel_call_args call_args = { |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1193 | .pollent = calld->pollent, |
| 1194 | .path = calld->path, |
| 1195 | .start_time = calld->call_start_time, |
| 1196 | .deadline = calld->deadline, |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1197 | .arena = calld->arena, |
| 1198 | .context = calld->subchannel_call_context}; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1199 | grpc_error *error = grpc_connected_subchannel_create_call( |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1200 | exec_ctx, calld->connected_subchannel, &call_args, &subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1201 | gpr_atm_rel_store(&calld->subchannel_call, |
| 1202 | (gpr_atm)(uintptr_t)subchannel_call); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1203 | if (error != GRPC_ERROR_NONE) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1204 | fail_locked(exec_ctx, calld, GRPC_ERROR_REF(error)); |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1205 | grpc_transport_stream_op_batch_finish_with_failure(exec_ctx, op, error); |
Mark D. Roth | ca13603 | 2017-04-04 13:53:29 -0700 | [diff] [blame] | 1206 | } else { |
Mark D. Roth | ca13603 | 2017-04-04 13:53:29 -0700 | [diff] [blame] | 1207 | retry_waiting_locked(exec_ctx, calld); |
| 1208 | /* recurse to retry */ |
| 1209 | start_transport_stream_op_batch_locked_inner(exec_ctx, op, elem); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1210 | } |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1211 | /* early out */ |
| 1212 | return; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1213 | } |
| 1214 | /* nothing to be done but wait */ |
| 1215 | add_waiting_locked(calld, op); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1216 | } |
| 1217 | |
Mark D. Roth | de14410 | 2017-03-15 10:11:03 -0700 | [diff] [blame] | 1218 | static void on_complete(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1219 | grpc_call_element *elem = arg; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1220 | call_data *calld = elem->call_data; |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 1221 | if (calld->retry_throttle_data != NULL) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1222 | if (error == GRPC_ERROR_NONE) { |
| 1223 | grpc_server_retry_throttle_data_record_success( |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 1224 | calld->retry_throttle_data); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1225 | } else { |
| 1226 | // TODO(roth): In a subsequent PR, check the return value here and |
Mark D. Roth | b332256 | 2017-02-23 14:38:02 -0800 | [diff] [blame] | 1227 | // decide whether or not to retry. Note that we should only |
| 1228 | // record failures whose statuses match the configured retryable |
| 1229 | // or non-fatal status codes. |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1230 | grpc_server_retry_throttle_data_record_failure( |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 1231 | calld->retry_throttle_data); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1232 | } |
| 1233 | } |
Mark D. Roth | 95039b5 | 2017-02-24 07:59:45 -0800 | [diff] [blame] | 1234 | grpc_closure_run(exec_ctx, calld->original_on_complete, |
| 1235 | GRPC_ERROR_REF(error)); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1236 | } |
| 1237 | |
Craig Tiller | e1b51da | 2017-03-31 15:44:33 -0700 | [diff] [blame] | 1238 | static void start_transport_stream_op_batch_locked(grpc_exec_ctx *exec_ctx, |
| 1239 | void *arg, |
| 1240 | grpc_error *error_ignored) { |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1241 | GPR_TIMER_BEGIN("start_transport_stream_op_batch_locked", 0); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1242 | |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1243 | grpc_transport_stream_op_batch *op = arg; |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 1244 | grpc_call_element *elem = op->handler_private.extra_arg; |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1245 | call_data *calld = elem->call_data; |
| 1246 | |
Craig Tiller | f6cb0c0 | 2017-03-28 14:11:49 -0700 | [diff] [blame] | 1247 | if (op->recv_trailing_metadata) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1248 | GPR_ASSERT(op->on_complete != NULL); |
| 1249 | calld->original_on_complete = op->on_complete; |
Mark D. Roth | de14410 | 2017-03-15 10:11:03 -0700 | [diff] [blame] | 1250 | grpc_closure_init(&calld->on_complete, on_complete, elem, |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 1251 | grpc_schedule_on_exec_ctx); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1252 | op->on_complete = &calld->on_complete; |
| 1253 | } |
| 1254 | |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1255 | start_transport_stream_op_batch_locked_inner(exec_ctx, op, elem); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1256 | |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1257 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1258 | "start_transport_stream_op_batch"); |
| 1259 | GPR_TIMER_END("start_transport_stream_op_batch_locked", 0); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1260 | } |
| 1261 | |
Craig Tiller | be9691a | 2017-02-14 10:00:42 -0800 | [diff] [blame] | 1262 | /* The logic here is fairly complicated, due to (a) the fact that we |
| 1263 | need to handle the case where we receive the send op before the |
| 1264 | initial metadata op, and (b) the need for efficiency, especially in |
| 1265 | the streaming case. |
| 1266 | |
| 1267 | We use double-checked locking to initially see if initialization has been |
| 1268 | performed. If it has not, we acquire the combiner and perform initialization. |
| 1269 | If it has, we proceed on the fast path. */ |
Craig Tiller | e1b51da | 2017-03-31 15:44:33 -0700 | [diff] [blame] | 1270 | static void cc_start_transport_stream_op_batch( |
| 1271 | grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| 1272 | grpc_transport_stream_op_batch *op) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1273 | call_data *calld = elem->call_data; |
| 1274 | channel_data *chand = elem->channel_data; |
| 1275 | GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1276 | if (chand->deadline_checking_enabled) { |
Craig Tiller | 29ebc57 | 2017-04-04 08:00:55 -0700 | [diff] [blame] | 1277 | grpc_deadline_state_client_start_transport_stream_op_batch(exec_ctx, elem, |
| 1278 | op); |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1279 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1280 | /* try to (atomically) get the call */ |
| 1281 | grpc_subchannel_call *call = GET_CALL(calld); |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1282 | GPR_TIMER_BEGIN("cc_start_transport_stream_op_batch", 0); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1283 | if (call == CANCELLED_CALL) { |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1284 | grpc_transport_stream_op_batch_finish_with_failure( |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1285 | exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error)); |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1286 | GPR_TIMER_END("cc_start_transport_stream_op_batch", 0); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1287 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1288 | return; |
| 1289 | } |
| 1290 | if (call != NULL) { |
| 1291 | grpc_subchannel_call_process_op(exec_ctx, call, op); |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1292 | GPR_TIMER_END("cc_start_transport_stream_op_batch", 0); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1293 | /* early out */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1294 | return; |
| 1295 | } |
| 1296 | /* we failed; lock and figure out what to do */ |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1297 | GRPC_CALL_STACK_REF(calld->owning_call, "start_transport_stream_op_batch"); |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 1298 | op->handler_private.extra_arg = elem; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1299 | grpc_closure_sched( |
| 1300 | exec_ctx, |
Craig Tiller | 4a84bdd | 2017-02-14 09:48:41 -0800 | [diff] [blame] | 1301 | grpc_closure_init(&op->handler_private.closure, |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1302 | start_transport_stream_op_batch_locked, op, |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 1303 | grpc_combiner_scheduler(chand->combiner, false)), |
| 1304 | GRPC_ERROR_NONE); |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1305 | GPR_TIMER_END("cc_start_transport_stream_op_batch", 0); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1306 | } |
| 1307 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1308 | /* Constructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1309 | static grpc_error *cc_init_call_elem(grpc_exec_ctx *exec_ctx, |
| 1310 | grpc_call_element *elem, |
Craig Tiller | c52ba3a | 2017-02-15 22:57:43 -0800 | [diff] [blame] | 1311 | const grpc_call_element_args *args) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1312 | call_data *calld = elem->call_data; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1313 | channel_data *chand = elem->channel_data; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1314 | // Initialize data members. |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1315 | calld->path = grpc_slice_ref_internal(args->path); |
Mark D. Roth | ff08f33 | 2016-10-14 13:01:01 -0700 | [diff] [blame] | 1316 | calld->call_start_time = args->start_time; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1317 | calld->deadline = gpr_convert_clock_type(args->deadline, GPR_CLOCK_MONOTONIC); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1318 | calld->owning_call = args->call_stack; |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1319 | calld->arena = args->arena; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1320 | if (chand->deadline_checking_enabled) { |
Craig Tiller | 71d6ce6 | 2017-04-06 09:10:09 -0700 | [diff] [blame] | 1321 | grpc_deadline_state_init(exec_ctx, elem, args->call_stack, calld->deadline); |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1322 | } |
Mark D. Roth | 0badbe8 | 2016-06-23 10:15:12 -0700 | [diff] [blame] | 1323 | return GRPC_ERROR_NONE; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1324 | } |
| 1325 | |
| 1326 | /* Destructor for call_data */ |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1327 | static void cc_destroy_call_elem(grpc_exec_ctx *exec_ctx, |
| 1328 | grpc_call_element *elem, |
| 1329 | const grpc_call_final_info *final_info, |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1330 | grpc_closure *then_schedule_closure) { |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1331 | call_data *calld = elem->call_data; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1332 | channel_data *chand = elem->channel_data; |
| 1333 | if (chand->deadline_checking_enabled) { |
| 1334 | grpc_deadline_state_destroy(exec_ctx, elem); |
| 1335 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1336 | grpc_slice_unref_internal(exec_ctx, calld->path); |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 1337 | if (calld->method_params != NULL) { |
| 1338 | method_parameters_unref(calld->method_params); |
| 1339 | } |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 1340 | GRPC_ERROR_UNREF(calld->cancel_error); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1341 | grpc_subchannel_call *call = GET_CALL(calld); |
| 1342 | if (call != NULL && call != CANCELLED_CALL) { |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1343 | grpc_subchannel_call_set_cleanup_closure(call, then_schedule_closure); |
| 1344 | then_schedule_closure = NULL; |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1345 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "client_channel_destroy_call"); |
| 1346 | } |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1347 | GPR_ASSERT(!calld->pick_pending); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1348 | GPR_ASSERT(calld->waiting_ops_count == 0); |
Craig Tiller | 693d394 | 2016-10-27 16:51:25 -0700 | [diff] [blame] | 1349 | if (calld->connected_subchannel != NULL) { |
| 1350 | GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, calld->connected_subchannel, |
| 1351 | "picked"); |
| 1352 | } |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1353 | for (size_t i = 0; i < GRPC_CONTEXT_COUNT; ++i) { |
| 1354 | if (calld->subchannel_call_context[i].value != NULL) { |
| 1355 | calld->subchannel_call_context[i].destroy( |
| 1356 | calld->subchannel_call_context[i].value); |
| 1357 | } |
| 1358 | } |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1359 | gpr_free(calld->waiting_ops); |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1360 | grpc_closure_sched(exec_ctx, then_schedule_closure, GRPC_ERROR_NONE); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1361 | } |
| 1362 | |
David Garcia Quintas | f72eb97 | 2016-05-03 18:28:09 -0700 | [diff] [blame] | 1363 | static void cc_set_pollset_or_pollset_set(grpc_exec_ctx *exec_ctx, |
| 1364 | grpc_call_element *elem, |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1365 | grpc_polling_entity *pollent) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1366 | call_data *calld = elem->call_data; |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1367 | calld->pollent = pollent; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1368 | } |
| 1369 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1370 | /************************************************************************* |
| 1371 | * EXPORTED SYMBOLS |
| 1372 | */ |
| 1373 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1374 | const grpc_channel_filter grpc_client_channel_filter = { |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1375 | cc_start_transport_stream_op_batch, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1376 | cc_start_transport_op, |
| 1377 | sizeof(call_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1378 | cc_init_call_elem, |
David Garcia Quintas | 4afce7e | 2016-04-18 16:25:17 -0700 | [diff] [blame] | 1379 | cc_set_pollset_or_pollset_set, |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1380 | cc_destroy_call_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1381 | sizeof(channel_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1382 | cc_init_channel_elem, |
| 1383 | cc_destroy_channel_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1384 | cc_get_peer, |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 1385 | cc_get_channel_info, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1386 | "client-channel", |
Craig Tiller | 87d5b19 | 2015-04-16 14:37:57 -0700 | [diff] [blame] | 1387 | }; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1388 | |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1389 | static void try_to_connect_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 1390 | grpc_error *error_ignored) { |
| 1391 | channel_data *chand = arg; |
| 1392 | if (chand->lb_policy != NULL) { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 1393 | grpc_lb_policy_exit_idle_locked(exec_ctx, chand->lb_policy); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1394 | } else { |
| 1395 | chand->exit_idle_when_lb_policy_arrives = true; |
| 1396 | if (!chand->started_resolving && chand->resolver != NULL) { |
| 1397 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
| 1398 | chand->started_resolving = true; |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 1399 | grpc_resolver_next_locked(exec_ctx, chand->resolver, |
| 1400 | &chand->resolver_result, |
| 1401 | &chand->on_resolver_result_changed); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1402 | } |
| 1403 | } |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1404 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "try_to_connect"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1405 | } |
| 1406 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1407 | grpc_connectivity_state grpc_client_channel_check_connectivity_state( |
| 1408 | 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] | 1409 | channel_data *chand = elem->channel_data; |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame] | 1410 | grpc_connectivity_state out = |
| 1411 | grpc_connectivity_state_check(&chand->state_tracker); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1412 | if (out == GRPC_CHANNEL_IDLE && try_to_connect) { |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1413 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "try_to_connect"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1414 | grpc_closure_sched( |
| 1415 | exec_ctx, |
| 1416 | grpc_closure_create(try_to_connect_locked, chand, |
| 1417 | grpc_combiner_scheduler(chand->combiner, false)), |
| 1418 | GRPC_ERROR_NONE); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1419 | } |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1420 | return out; |
| 1421 | } |
| 1422 | |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1423 | typedef struct { |
| 1424 | channel_data *chand; |
| 1425 | grpc_pollset *pollset; |
| 1426 | grpc_closure *on_complete; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1427 | grpc_connectivity_state *state; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1428 | grpc_closure my_closure; |
| 1429 | } external_connectivity_watcher; |
| 1430 | |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1431 | 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] | 1432 | grpc_error *error) { |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1433 | external_connectivity_watcher *w = arg; |
| 1434 | grpc_closure *follow_up = w->on_complete; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1435 | grpc_pollset_set_del_pollset(exec_ctx, w->chand->interested_parties, |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1436 | w->pollset); |
| 1437 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, |
| 1438 | "external_connectivity_watcher"); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1439 | gpr_free(w); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1440 | grpc_closure_run(exec_ctx, follow_up, GRPC_ERROR_REF(error)); |
| 1441 | } |
| 1442 | |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame] | 1443 | static void watch_connectivity_state_locked(grpc_exec_ctx *exec_ctx, void *arg, |
| 1444 | grpc_error *error_ignored) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1445 | external_connectivity_watcher *w = arg; |
| 1446 | grpc_closure_init(&w->my_closure, on_external_watch_complete, w, |
| 1447 | grpc_schedule_on_exec_ctx); |
| 1448 | grpc_connectivity_state_notify_on_state_change( |
| 1449 | exec_ctx, &w->chand->state_tracker, w->state, &w->my_closure); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1450 | } |
| 1451 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1452 | void grpc_client_channel_watch_connectivity_state( |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 1453 | grpc_exec_ctx *exec_ctx, grpc_channel_element *elem, grpc_pollset *pollset, |
Mark D. Roth | 9221083 | 2017-05-02 15:04:39 -0700 | [diff] [blame^] | 1454 | grpc_connectivity_state *state, grpc_closure *closure) { |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1455 | channel_data *chand = elem->channel_data; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1456 | external_connectivity_watcher *w = gpr_malloc(sizeof(*w)); |
| 1457 | w->chand = chand; |
| 1458 | w->pollset = pollset; |
Mark D. Roth | 9221083 | 2017-05-02 15:04:39 -0700 | [diff] [blame^] | 1459 | w->on_complete = closure; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1460 | w->state = state; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 1461 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, pollset); |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1462 | GRPC_CHANNEL_STACK_REF(w->chand->owning_stack, |
| 1463 | "external_connectivity_watcher"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1464 | grpc_closure_sched( |
| 1465 | exec_ctx, |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame] | 1466 | grpc_closure_init(&w->my_closure, watch_connectivity_state_locked, w, |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1467 | grpc_combiner_scheduler(chand->combiner, true)), |
| 1468 | GRPC_ERROR_NONE); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1469 | } |