Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2015 gRPC authors. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
Yash Tibrewal | 37fdb73 | 2017-09-25 16:45:02 -0700 | [diff] [blame] | 19 | #include <grpc/support/port_platform.h> |
| 20 | |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 21 | #include "src/core/ext/filters/client_channel/client_channel.h" |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 22 | |
Yash Tibrewal | fcd26bc | 2017-09-25 15:08:28 -0700 | [diff] [blame] | 23 | #include <inttypes.h> |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 24 | #include <stdbool.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 25 | #include <stdio.h> |
Craig Tiller | eb3b12e | 2015-06-26 14:42:49 -0700 | [diff] [blame] | 26 | #include <string.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 27 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 28 | #include <grpc/support/alloc.h> |
| 29 | #include <grpc/support/log.h> |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 30 | #include <grpc/support/string_util.h> |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 31 | #include <grpc/support/sync.h> |
| 32 | #include <grpc/support/useful.h> |
| 33 | |
Yuchen Zeng | 0bad30a | 2017-10-05 21:47:39 -0700 | [diff] [blame] | 34 | #include "src/core/ext/filters/client_channel/backup_poller.h" |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 35 | #include "src/core/ext/filters/client_channel/http_connect_handshaker.h" |
| 36 | #include "src/core/ext/filters/client_channel/lb_policy_registry.h" |
| 37 | #include "src/core/ext/filters/client_channel/proxy_mapper_registry.h" |
| 38 | #include "src/core/ext/filters/client_channel/resolver_registry.h" |
| 39 | #include "src/core/ext/filters/client_channel/retry_throttle.h" |
| 40 | #include "src/core/ext/filters/client_channel/subchannel.h" |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 41 | #include "src/core/ext/filters/deadline/deadline_filter.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 42 | #include "src/core/lib/channel/channel_args.h" |
| 43 | #include "src/core/lib/channel/connected_channel.h" |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 44 | #include "src/core/lib/iomgr/combiner.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 45 | #include "src/core/lib/iomgr/iomgr.h" |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 46 | #include "src/core/lib/iomgr/polling_entity.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 47 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 48 | #include "src/core/lib/slice/slice_internal.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 49 | #include "src/core/lib/support/string.h" |
| 50 | #include "src/core/lib/surface/channel.h" |
| 51 | #include "src/core/lib/transport/connectivity_state.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 52 | #include "src/core/lib/transport/metadata.h" |
| 53 | #include "src/core/lib/transport/metadata_batch.h" |
Mark D. Roth | ea846a0 | 2016-11-03 11:32:54 -0700 | [diff] [blame] | 54 | #include "src/core/lib/transport/service_config.h" |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 55 | #include "src/core/lib/transport/static_metadata.h" |
Craig Tiller | 8910ac6 | 2015-10-08 16:49:15 -0700 | [diff] [blame] | 56 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 57 | /* Client channel implementation */ |
| 58 | |
ncteisen | 7712c7c | 2017-07-12 23:11:27 -0700 | [diff] [blame] | 59 | grpc_tracer_flag grpc_client_channel_trace = |
| 60 | GRPC_TRACER_INITIALIZER(false, "client_channel"); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 61 | |
Mark D. Roth | 26b7be4 | 2016-10-24 10:08:07 -0700 | [diff] [blame] | 62 | /************************************************************************* |
| 63 | * METHOD-CONFIG TABLE |
| 64 | */ |
| 65 | |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 66 | typedef enum { |
Craig Tiller | 7acc37e | 2017-02-28 10:01:37 -0800 | [diff] [blame] | 67 | /* zero so it can be default initialized */ |
| 68 | WAIT_FOR_READY_UNSET = 0, |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 69 | WAIT_FOR_READY_FALSE, |
| 70 | WAIT_FOR_READY_TRUE |
| 71 | } wait_for_ready_value; |
| 72 | |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 73 | typedef struct { |
| 74 | gpr_refcount refs; |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 75 | grpc_millis timeout; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 76 | wait_for_ready_value wait_for_ready; |
| 77 | } method_parameters; |
| 78 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 79 | static method_parameters* method_parameters_ref( |
| 80 | method_parameters* method_params) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 81 | gpr_ref(&method_params->refs); |
| 82 | return method_params; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 83 | } |
| 84 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 85 | static void method_parameters_unref(method_parameters* method_params) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 86 | if (gpr_unref(&method_params->refs)) { |
| 87 | gpr_free(method_params); |
| 88 | } |
| 89 | } |
| 90 | |
Mark D. Roth | 76d0ec4 | 2017-10-26 11:08:14 -0700 | [diff] [blame] | 91 | // Wrappers to pass to grpc_service_config_create_method_config_table(). |
Craig Tiller | a64b2b1 | 2017-11-03 15:23:13 -0700 | [diff] [blame] | 92 | static void* method_parameters_ref_wrapper(void* value) { |
| 93 | return method_parameters_ref((method_parameters*)value); |
Mark D. Roth | 76d0ec4 | 2017-10-26 11:08:14 -0700 | [diff] [blame] | 94 | } |
Craig Tiller | a64b2b1 | 2017-11-03 15:23:13 -0700 | [diff] [blame] | 95 | static void method_parameters_unref_wrapper(grpc_exec_ctx* exec_ctx, |
| 96 | void* value) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 97 | method_parameters_unref((method_parameters*)value); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 98 | } |
| 99 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 100 | static bool parse_wait_for_ready(grpc_json* field, |
| 101 | wait_for_ready_value* wait_for_ready) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 102 | if (field->type != GRPC_JSON_TRUE && field->type != GRPC_JSON_FALSE) { |
| 103 | return false; |
| 104 | } |
| 105 | *wait_for_ready = field->type == GRPC_JSON_TRUE ? WAIT_FOR_READY_TRUE |
| 106 | : WAIT_FOR_READY_FALSE; |
| 107 | return true; |
| 108 | } |
| 109 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 110 | static bool parse_timeout(grpc_json* field, grpc_millis* timeout) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 111 | if (field->type != GRPC_JSON_STRING) return false; |
| 112 | size_t len = strlen(field->value); |
| 113 | if (field->value[len - 1] != 's') return false; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 114 | char* buf = gpr_strdup(field->value); |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 115 | buf[len - 1] = '\0'; // Remove trailing 's'. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 116 | char* decimal_point = strchr(buf, '.'); |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 117 | int nanos = 0; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 118 | if (decimal_point != nullptr) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 119 | *decimal_point = '\0'; |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 120 | nanos = gpr_parse_nonnegative_int(decimal_point + 1); |
| 121 | if (nanos == -1) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 122 | gpr_free(buf); |
| 123 | return false; |
| 124 | } |
Mark D. Roth | a282146 | 2017-10-26 11:31:58 -0700 | [diff] [blame] | 125 | int num_digits = (int)strlen(decimal_point + 1); |
| 126 | if (num_digits > 9) { // We don't accept greater precision than nanos. |
| 127 | gpr_free(buf); |
| 128 | return false; |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 129 | } |
Mark D. Roth | a282146 | 2017-10-26 11:31:58 -0700 | [diff] [blame] | 130 | for (int i = 0; i < (9 - num_digits); ++i) { |
| 131 | nanos *= 10; |
| 132 | } |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 133 | } |
Mark D. Roth | a282146 | 2017-10-26 11:31:58 -0700 | [diff] [blame] | 134 | int seconds = decimal_point == buf ? 0 : gpr_parse_nonnegative_int(buf); |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 135 | gpr_free(buf); |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 136 | if (seconds == -1) return false; |
| 137 | *timeout = seconds * GPR_MS_PER_SEC + nanos / GPR_NS_PER_MS; |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 138 | return true; |
| 139 | } |
| 140 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 141 | static void* method_parameters_create_from_json(const grpc_json* json) { |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 142 | wait_for_ready_value wait_for_ready = WAIT_FOR_READY_UNSET; |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 143 | grpc_millis timeout = 0; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 144 | for (grpc_json* field = json->child; field != nullptr; field = field->next) { |
| 145 | if (field->key == nullptr) continue; |
Mark D. Roth | 84c8a02 | 2016-11-10 09:39:34 -0800 | [diff] [blame] | 146 | if (strcmp(field->key, "waitForReady") == 0) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 147 | if (wait_for_ready != WAIT_FOR_READY_UNSET) return nullptr; // Duplicate. |
| 148 | if (!parse_wait_for_ready(field, &wait_for_ready)) return nullptr; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 149 | } else if (strcmp(field->key, "timeout") == 0) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 150 | if (timeout > 0) return nullptr; // Duplicate. |
| 151 | if (!parse_timeout(field, &timeout)) return nullptr; |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 152 | } |
| 153 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 154 | method_parameters* value = |
| 155 | (method_parameters*)gpr_malloc(sizeof(method_parameters)); |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 156 | gpr_ref_init(&value->refs, 1); |
Mark D. Roth | c968e60 | 2016-11-02 14:07:36 -0700 | [diff] [blame] | 157 | value->timeout = timeout; |
| 158 | value->wait_for_ready = wait_for_ready; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 159 | return value; |
| 160 | } |
| 161 | |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 162 | struct external_connectivity_watcher; |
| 163 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 164 | /************************************************************************* |
| 165 | * CHANNEL-WIDE FUNCTIONS |
| 166 | */ |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 167 | |
Craig Tiller | 800dacb | 2015-10-06 09:10:26 -0700 | [diff] [blame] | 168 | typedef struct client_channel_channel_data { |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 169 | /** resolver for this channel */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 170 | grpc_resolver* resolver; |
Craig Tiller | 20a3c35 | 2015-08-05 08:39:50 -0700 | [diff] [blame] | 171 | /** have we started resolving this channel */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 172 | bool started_resolving; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 173 | /** is deadline checking enabled? */ |
| 174 | bool deadline_checking_enabled; |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 175 | /** client channel factory */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 176 | grpc_client_channel_factory* client_channel_factory; |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 177 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 178 | /** combiner protecting all variables below in this data structure */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 179 | grpc_combiner* combiner; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 180 | /** currently active load balancer */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 181 | grpc_lb_policy* lb_policy; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 182 | /** retry throttle data */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 183 | grpc_server_retry_throttle_data* retry_throttle_data; |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 184 | /** maps method names to method_parameters structs */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 185 | grpc_slice_hash_table* method_params_table; |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 186 | /** incoming resolver result - set by resolver.next() */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 187 | grpc_channel_args* resolver_result; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 188 | /** a list of closures that are all waiting for resolver result to come in */ |
| 189 | grpc_closure_list waiting_for_resolver_result_closures; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 190 | /** resolver callback */ |
Mark D. Roth | ff4df06 | 2016-08-22 15:02:49 -0700 | [diff] [blame] | 191 | grpc_closure on_resolver_result_changed; |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 192 | /** connectivity state being tracked */ |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 193 | grpc_connectivity_state_tracker state_tracker; |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 194 | /** when an lb_policy arrives, should we try to exit idle */ |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 195 | bool exit_idle_when_lb_policy_arrives; |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 196 | /** owning stack */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 197 | grpc_channel_stack* owning_stack; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 198 | /** interested parties (owned) */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 199 | grpc_pollset_set* interested_parties; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 200 | |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 201 | /* external_connectivity_watcher_list head is guarded by its own mutex, since |
| 202 | * counts need to be grabbed immediately without polling on a cq */ |
| 203 | gpr_mu external_connectivity_watcher_list_mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 204 | struct external_connectivity_watcher* external_connectivity_watcher_list_head; |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 205 | |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 206 | /* 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] | 207 | to be instantaneously available */ |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 208 | gpr_mu info_mu; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 209 | char* info_lb_policy_name; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 210 | /** service config in JSON form */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 211 | char* info_service_config_json; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 212 | } channel_data; |
| 213 | |
Craig Tiller | d6c98df | 2015-08-18 09:33:44 -0700 | [diff] [blame] | 214 | /** 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] | 215 | resolver, to watch for state changes from the lb_policy. When a state |
| 216 | change is seen, we update the channel, and create a new watcher. */ |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 217 | typedef struct { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 218 | channel_data* chand; |
Craig Tiller | 3382511 | 2015-09-18 07:44:19 -0700 | [diff] [blame] | 219 | grpc_closure on_changed; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 220 | grpc_connectivity_state state; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 221 | grpc_lb_policy* lb_policy; |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 222 | } lb_policy_connectivity_watcher; |
| 223 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 224 | static void watch_lb_policy_locked(grpc_exec_ctx* exec_ctx, channel_data* chand, |
| 225 | grpc_lb_policy* lb_policy, |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 226 | grpc_connectivity_state current_state); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 227 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 228 | static void set_channel_connectivity_state_locked(grpc_exec_ctx* exec_ctx, |
| 229 | channel_data* chand, |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 230 | grpc_connectivity_state state, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 231 | grpc_error* error, |
| 232 | const char* reason) { |
David Garcia Quintas | 3725128 | 2017-04-14 13:46:03 -0700 | [diff] [blame] | 233 | /* TODO: Improve failure handling: |
| 234 | * - Make it possible for policies to return GRPC_CHANNEL_TRANSIENT_FAILURE. |
| 235 | * - Hand over pending picks from old policies during the switch that happens |
| 236 | * when resolver provides an update. */ |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 237 | if (chand->lb_policy != nullptr) { |
David Garcia Quintas | 956f700 | 2017-04-13 15:40:06 -0700 | [diff] [blame] | 238 | if (state == GRPC_CHANNEL_TRANSIENT_FAILURE) { |
| 239 | /* cancel picks with wait_for_ready=false */ |
| 240 | grpc_lb_policy_cancel_picks_locked( |
| 241 | exec_ctx, chand->lb_policy, |
| 242 | /* mask= */ GRPC_INITIAL_METADATA_WAIT_FOR_READY, |
| 243 | /* check= */ 0, GRPC_ERROR_REF(error)); |
| 244 | } else if (state == GRPC_CHANNEL_SHUTDOWN) { |
| 245 | /* cancel all picks */ |
| 246 | grpc_lb_policy_cancel_picks_locked(exec_ctx, chand->lb_policy, |
| 247 | /* mask= */ 0, /* check= */ 0, |
| 248 | GRPC_ERROR_REF(error)); |
| 249 | } |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 250 | } |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 251 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 252 | gpr_log(GPR_DEBUG, "chand=%p: setting connectivity state to %s", chand, |
| 253 | grpc_connectivity_state_name(state)); |
| 254 | } |
Craig Tiller | 9ccf5f1 | 2016-05-07 21:41:01 -0700 | [diff] [blame] | 255 | grpc_connectivity_state_set(exec_ctx, &chand->state_tracker, state, error, |
| 256 | reason); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 257 | } |
| 258 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 259 | static void on_lb_policy_state_changed_locked(grpc_exec_ctx* exec_ctx, |
| 260 | void* arg, grpc_error* error) { |
| 261 | lb_policy_connectivity_watcher* w = (lb_policy_connectivity_watcher*)arg; |
Craig Tiller | cb2609f | 2015-11-24 17:19:19 -0800 | [diff] [blame] | 262 | grpc_connectivity_state publish_state = w->state; |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 263 | /* check if the notification is for the latest policy */ |
| 264 | if (w->lb_policy == w->chand->lb_policy) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 265 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 266 | gpr_log(GPR_DEBUG, "chand=%p: lb_policy=%p state changed to %s", w->chand, |
| 267 | w->lb_policy, grpc_connectivity_state_name(w->state)); |
| 268 | } |
Craig Tiller | be98d24 | 2017-11-10 15:26:57 -0800 | [diff] [blame] | 269 | if (publish_state == GRPC_CHANNEL_SHUTDOWN && |
| 270 | w->chand->resolver != nullptr) { |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 271 | publish_state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 272 | grpc_resolver_channel_saw_error_locked(exec_ctx, w->chand->resolver); |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 273 | GRPC_LB_POLICY_UNREF(exec_ctx, w->chand->lb_policy, "channel"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 274 | w->chand->lb_policy = nullptr; |
Craig Tiller | c5de835 | 2017-02-09 14:08:05 -0800 | [diff] [blame] | 275 | } |
| 276 | set_channel_connectivity_state_locked(exec_ctx, w->chand, publish_state, |
| 277 | GRPC_ERROR_REF(error), "lb_changed"); |
| 278 | if (w->state != GRPC_CHANNEL_SHUTDOWN) { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 279 | 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] | 280 | } |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 281 | } |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 282 | 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] | 283 | gpr_free(w); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 284 | } |
| 285 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 286 | static void watch_lb_policy_locked(grpc_exec_ctx* exec_ctx, channel_data* chand, |
| 287 | grpc_lb_policy* lb_policy, |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 288 | grpc_connectivity_state current_state) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 289 | lb_policy_connectivity_watcher* w = |
| 290 | (lb_policy_connectivity_watcher*)gpr_malloc(sizeof(*w)); |
Craig Tiller | 906e3bc | 2015-11-24 07:31:31 -0800 | [diff] [blame] | 291 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "watch_lb_policy"); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 292 | w->chand = chand; |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 293 | GRPC_CLOSURE_INIT(&w->on_changed, on_lb_policy_state_changed_locked, w, |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 294 | grpc_combiner_scheduler(chand->combiner)); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 295 | w->state = current_state; |
| 296 | w->lb_policy = lb_policy; |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 297 | grpc_lb_policy_notify_on_state_change_locked(exec_ctx, lb_policy, &w->state, |
| 298 | &w->on_changed); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 299 | } |
| 300 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 301 | static void start_resolving_locked(grpc_exec_ctx* exec_ctx, |
| 302 | channel_data* chand) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 303 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 304 | gpr_log(GPR_DEBUG, "chand=%p: starting name resolution", chand); |
| 305 | } |
| 306 | GPR_ASSERT(!chand->started_resolving); |
| 307 | chand->started_resolving = true; |
| 308 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver"); |
| 309 | grpc_resolver_next_locked(exec_ctx, chand->resolver, &chand->resolver_result, |
| 310 | &chand->on_resolver_result_changed); |
| 311 | } |
| 312 | |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 313 | typedef struct { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 314 | char* server_name; |
| 315 | grpc_server_retry_throttle_data* retry_throttle_data; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 316 | } service_config_parsing_state; |
| 317 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 318 | static void parse_retry_throttle_params(const grpc_json* field, void* arg) { |
| 319 | service_config_parsing_state* parsing_state = |
| 320 | (service_config_parsing_state*)arg; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 321 | if (strcmp(field->key, "retryThrottling") == 0) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 322 | if (parsing_state->retry_throttle_data != nullptr) return; // Duplicate. |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 323 | if (field->type != GRPC_JSON_OBJECT) return; |
| 324 | int max_milli_tokens = 0; |
| 325 | int milli_token_ratio = 0; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 326 | for (grpc_json* sub_field = field->child; sub_field != nullptr; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 327 | sub_field = sub_field->next) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 328 | if (sub_field->key == nullptr) return; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 329 | if (strcmp(sub_field->key, "maxTokens") == 0) { |
| 330 | if (max_milli_tokens != 0) return; // Duplicate. |
| 331 | if (sub_field->type != GRPC_JSON_NUMBER) return; |
| 332 | max_milli_tokens = gpr_parse_nonnegative_int(sub_field->value); |
| 333 | if (max_milli_tokens == -1) return; |
| 334 | max_milli_tokens *= 1000; |
| 335 | } else if (strcmp(sub_field->key, "tokenRatio") == 0) { |
| 336 | if (milli_token_ratio != 0) return; // Duplicate. |
| 337 | if (sub_field->type != GRPC_JSON_NUMBER) return; |
| 338 | // We support up to 3 decimal digits. |
| 339 | size_t whole_len = strlen(sub_field->value); |
| 340 | uint32_t multiplier = 1; |
| 341 | uint32_t decimal_value = 0; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 342 | const char* decimal_point = strchr(sub_field->value, '.'); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 343 | if (decimal_point != nullptr) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 344 | whole_len = (size_t)(decimal_point - sub_field->value); |
| 345 | multiplier = 1000; |
| 346 | size_t decimal_len = strlen(decimal_point + 1); |
| 347 | if (decimal_len > 3) decimal_len = 3; |
| 348 | if (!gpr_parse_bytes_to_uint32(decimal_point + 1, decimal_len, |
| 349 | &decimal_value)) { |
| 350 | return; |
| 351 | } |
| 352 | uint32_t decimal_multiplier = 1; |
| 353 | for (size_t i = 0; i < (3 - decimal_len); ++i) { |
| 354 | decimal_multiplier *= 10; |
| 355 | } |
| 356 | decimal_value *= decimal_multiplier; |
| 357 | } |
| 358 | uint32_t whole_value; |
| 359 | if (!gpr_parse_bytes_to_uint32(sub_field->value, whole_len, |
| 360 | &whole_value)) { |
| 361 | return; |
| 362 | } |
| 363 | milli_token_ratio = (int)((whole_value * multiplier) + decimal_value); |
Mark D. Roth | b332256 | 2017-02-23 14:38:02 -0800 | [diff] [blame] | 364 | if (milli_token_ratio <= 0) return; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 365 | } |
| 366 | } |
| 367 | parsing_state->retry_throttle_data = |
| 368 | grpc_retry_throttle_map_get_data_for_server( |
| 369 | parsing_state->server_name, max_milli_tokens, milli_token_ratio); |
| 370 | } |
| 371 | } |
| 372 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 373 | static void on_resolver_result_changed_locked(grpc_exec_ctx* exec_ctx, |
| 374 | void* arg, grpc_error* error) { |
| 375 | channel_data* chand = (channel_data*)arg; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 376 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 377 | gpr_log(GPR_DEBUG, "chand=%p: got resolver result: error=%s", chand, |
| 378 | grpc_error_string(error)); |
| 379 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 380 | // Extract the following fields from the resolver result, if non-NULL. |
Mark D. Roth | 15494b5 | 2017-07-12 15:26:55 -0700 | [diff] [blame] | 381 | bool lb_policy_updated = false; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 382 | char* lb_policy_name_dup = nullptr; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 383 | bool lb_policy_name_changed = false; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 384 | grpc_lb_policy* new_lb_policy = nullptr; |
| 385 | char* service_config_json = nullptr; |
| 386 | grpc_server_retry_throttle_data* retry_throttle_data = nullptr; |
| 387 | grpc_slice_hash_table* method_params_table = nullptr; |
| 388 | if (chand->resolver_result != nullptr) { |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 389 | // Find LB policy name. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 390 | const char* lb_policy_name = nullptr; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 391 | const grpc_arg* channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 392 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_LB_POLICY_NAME); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 393 | if (channel_arg != nullptr) { |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 394 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
| 395 | lb_policy_name = channel_arg->value.string; |
Mark D. Roth | 5bd7be0 | 2016-10-21 14:19:50 -0700 | [diff] [blame] | 396 | } |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 397 | // Special case: If at least one balancer address is present, we use |
| 398 | // the grpclb policy, regardless of what the resolver actually specified. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 399 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 400 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_LB_ADDRESSES); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 401 | if (channel_arg != nullptr && channel_arg->type == GRPC_ARG_POINTER) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 402 | grpc_lb_addresses* addresses = |
| 403 | (grpc_lb_addresses*)channel_arg->value.pointer.p; |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 404 | bool found_balancer_address = false; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 405 | for (size_t i = 0; i < addresses->num_addresses; ++i) { |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 406 | if (addresses->addresses[i].is_balancer) { |
| 407 | found_balancer_address = true; |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 408 | break; |
| 409 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 410 | } |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 411 | if (found_balancer_address) { |
Craig Tiller | be98d24 | 2017-11-10 15:26:57 -0800 | [diff] [blame] | 412 | if (lb_policy_name != nullptr && |
| 413 | strcmp(lb_policy_name, "grpclb") != 0) { |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 414 | gpr_log(GPR_INFO, |
Mark D. Roth | 1eb96dc | 2017-03-22 12:19:03 -0700 | [diff] [blame] | 415 | "resolver requested LB policy %s but provided at least one " |
| 416 | "balancer address -- forcing use of grpclb LB policy", |
Mark D. Roth | 5f40e5d | 2016-10-24 13:09:05 -0700 | [diff] [blame] | 417 | lb_policy_name); |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 418 | } |
| 419 | lb_policy_name = "grpclb"; |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 420 | } |
Mark D. Roth | 88405f7 | 2016-10-03 08:24:52 -0700 | [diff] [blame] | 421 | } |
| 422 | // Use pick_first if nothing was specified and we didn't select grpclb |
| 423 | // above. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 424 | if (lb_policy_name == nullptr) lb_policy_name = "pick_first"; |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 425 | grpc_lb_policy_args lb_policy_args; |
| 426 | lb_policy_args.args = chand->resolver_result; |
| 427 | lb_policy_args.client_channel_factory = chand->client_channel_factory; |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 428 | lb_policy_args.combiner = chand->combiner; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 429 | // Check to see if we're already using the right LB policy. |
| 430 | // Note: It's safe to use chand->info_lb_policy_name here without |
| 431 | // taking a lock on chand->info_mu, because this function is the |
| 432 | // only thing that modifies its value, and it can only be invoked |
| 433 | // once at any given time. |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 434 | lb_policy_name_changed = |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 435 | chand->info_lb_policy_name == nullptr || |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 436 | strcmp(chand->info_lb_policy_name, lb_policy_name) != 0; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 437 | if (chand->lb_policy != nullptr && !lb_policy_name_changed) { |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 438 | // Continue using the same LB policy. Update with new addresses. |
Mark D. Roth | 15494b5 | 2017-07-12 15:26:55 -0700 | [diff] [blame] | 439 | lb_policy_updated = true; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 440 | grpc_lb_policy_update_locked(exec_ctx, chand->lb_policy, &lb_policy_args); |
| 441 | } else { |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 442 | // Instantiate new LB policy. |
| 443 | new_lb_policy = |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 444 | grpc_lb_policy_create(exec_ctx, lb_policy_name, &lb_policy_args); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 445 | if (new_lb_policy == nullptr) { |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 446 | gpr_log(GPR_ERROR, "could not create LB policy \"%s\"", lb_policy_name); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 447 | } |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 448 | } |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 449 | // Find service config. |
Mark D. Roth | af84245 | 2016-10-21 15:05:15 -0700 | [diff] [blame] | 450 | channel_arg = |
Mark D. Roth | 4112499 | 2016-11-03 11:22:20 -0700 | [diff] [blame] | 451 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_SERVICE_CONFIG); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 452 | if (channel_arg != nullptr) { |
Mark D. Roth | 9ec28af | 2016-11-03 12:32:39 -0700 | [diff] [blame] | 453 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 454 | service_config_json = gpr_strdup(channel_arg->value.string); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 455 | grpc_service_config* service_config = |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 456 | grpc_service_config_create(service_config_json); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 457 | if (service_config != nullptr) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 458 | channel_arg = |
| 459 | grpc_channel_args_find(chand->resolver_result, GRPC_ARG_SERVER_URI); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 460 | GPR_ASSERT(channel_arg != nullptr); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 461 | GPR_ASSERT(channel_arg->type == GRPC_ARG_STRING); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 462 | grpc_uri* uri = |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 463 | grpc_uri_parse(exec_ctx, channel_arg->value.string, true); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 464 | GPR_ASSERT(uri->path[0] != '\0'); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 465 | service_config_parsing_state parsing_state; |
| 466 | memset(&parsing_state, 0, sizeof(parsing_state)); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 467 | parsing_state.server_name = |
| 468 | uri->path[0] == '/' ? uri->path + 1 : uri->path; |
| 469 | grpc_service_config_parse_global_params( |
| 470 | service_config, parse_retry_throttle_params, &parsing_state); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 471 | grpc_uri_destroy(uri); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 472 | retry_throttle_data = parsing_state.retry_throttle_data; |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 473 | method_params_table = grpc_service_config_create_method_config_table( |
Craig Tiller | b28c7e8 | 2016-11-18 10:29:04 -0800 | [diff] [blame] | 474 | exec_ctx, service_config, method_parameters_create_from_json, |
Mark D. Roth | 76d0ec4 | 2017-10-26 11:08:14 -0700 | [diff] [blame] | 475 | method_parameters_ref_wrapper, method_parameters_unref_wrapper); |
Mark D. Roth | bdc58b2 | 2016-11-04 09:25:57 -0700 | [diff] [blame] | 476 | grpc_service_config_destroy(service_config); |
| 477 | } |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 478 | } |
Mark D. Roth | f79ce7d | 2016-11-04 08:43:36 -0700 | [diff] [blame] | 479 | // Before we clean up, save a copy of lb_policy_name, since it might |
| 480 | // be pointing to data inside chand->resolver_result. |
| 481 | // The copy will be saved in chand->lb_policy_name below. |
Yash Tibrewal | 9eb8672 | 2017-09-17 23:43:30 -0700 | [diff] [blame] | 482 | lb_policy_name_dup = gpr_strdup(lb_policy_name); |
Craig Tiller | 87a7e1f | 2016-11-09 09:42:19 -0800 | [diff] [blame] | 483 | grpc_channel_args_destroy(exec_ctx, chand->resolver_result); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 484 | chand->resolver_result = nullptr; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 485 | } |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 486 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 487 | gpr_log(GPR_DEBUG, |
| 488 | "chand=%p: resolver result: lb_policy_name=\"%s\"%s, " |
| 489 | "service_config=\"%s\"", |
Yash Tibrewal | 9eb8672 | 2017-09-17 23:43:30 -0700 | [diff] [blame] | 490 | chand, lb_policy_name_dup, |
| 491 | lb_policy_name_changed ? " (changed)" : "", service_config_json); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 492 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 493 | // Now swap out fields in chand. Note that the new values may still |
| 494 | // be NULL if (e.g.) the resolver failed to return results or the |
| 495 | // results did not contain the necessary data. |
| 496 | // |
| 497 | // First, swap out the data used by cc_get_channel_info(). |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 498 | gpr_mu_lock(&chand->info_mu); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 499 | if (lb_policy_name_dup != nullptr) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 500 | gpr_free(chand->info_lb_policy_name); |
Yash Tibrewal | 9eb8672 | 2017-09-17 23:43:30 -0700 | [diff] [blame] | 501 | chand->info_lb_policy_name = lb_policy_name_dup; |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 502 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 503 | if (service_config_json != nullptr) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 504 | gpr_free(chand->info_service_config_json); |
| 505 | chand->info_service_config_json = service_config_json; |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 506 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 507 | gpr_mu_unlock(&chand->info_mu); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 508 | // Swap out the retry throttle data. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 509 | if (chand->retry_throttle_data != nullptr) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 510 | grpc_server_retry_throttle_data_unref(chand->retry_throttle_data); |
| 511 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 512 | chand->retry_throttle_data = retry_throttle_data; |
| 513 | // Swap out the method params table. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 514 | if (chand->method_params_table != nullptr) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 515 | grpc_slice_hash_table_unref(exec_ctx, chand->method_params_table); |
Mark D. Roth | 046cf76 | 2016-09-26 11:13:51 -0700 | [diff] [blame] | 516 | } |
Mark D. Roth | 9d48094 | 2016-10-19 14:18:05 -0700 | [diff] [blame] | 517 | chand->method_params_table = method_params_table; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 518 | // If we have a new LB policy or are shutting down (in which case |
| 519 | // new_lb_policy will be NULL), swap out the LB policy, unreffing the |
| 520 | // old one and removing its fds from chand->interested_parties. |
| 521 | // Note that we do NOT do this if either (a) we updated the existing |
| 522 | // LB policy above or (b) we failed to create the new LB policy (in |
| 523 | // which case we want to continue using the most recent one we had). |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 524 | if (new_lb_policy != nullptr || error != GRPC_ERROR_NONE || |
| 525 | chand->resolver == nullptr) { |
| 526 | if (chand->lb_policy != nullptr) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 527 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 528 | gpr_log(GPR_DEBUG, "chand=%p: unreffing lb_policy=%p", chand, |
| 529 | chand->lb_policy); |
| 530 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 531 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 532 | chand->lb_policy->interested_parties, |
| 533 | chand->interested_parties); |
| 534 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
Craig Tiller | 45724b3 | 2015-09-22 10:42:19 -0700 | [diff] [blame] | 535 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 536 | chand->lb_policy = new_lb_policy; |
| 537 | } |
| 538 | // Now that we've swapped out the relevant fields of chand, check for |
| 539 | // error or shutdown. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 540 | if (error != GRPC_ERROR_NONE || chand->resolver == nullptr) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 541 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 542 | gpr_log(GPR_DEBUG, "chand=%p: shutting down", chand); |
| 543 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 544 | if (chand->resolver != nullptr) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 545 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 546 | gpr_log(GPR_DEBUG, "chand=%p: shutting down resolver", chand); |
| 547 | } |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 548 | grpc_resolver_shutdown_locked(exec_ctx, chand->resolver); |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 549 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 550 | chand->resolver = nullptr; |
Craig Tiller | 76a5c0e | 2016-03-09 09:05:30 -0800 | [diff] [blame] | 551 | } |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 552 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 553 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 554 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 555 | "Got resolver result after disconnection", &error, 1), |
Craig Tiller | 804ff71 | 2016-05-05 16:25:40 -0700 | [diff] [blame] | 556 | "resolver_gone"); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 557 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver"); |
| 558 | grpc_closure_list_fail_all(&chand->waiting_for_resolver_result_closures, |
| 559 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 560 | "Channel disconnected", &error, 1)); |
| 561 | GRPC_CLOSURE_LIST_SCHED(exec_ctx, |
| 562 | &chand->waiting_for_resolver_result_closures); |
| 563 | } else { // Not shutting down. |
| 564 | grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 565 | grpc_error* state_error = |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 566 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("No load balancing policy"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 567 | if (new_lb_policy != nullptr) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 568 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 569 | gpr_log(GPR_DEBUG, "chand=%p: initializing new LB policy", chand); |
| 570 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 571 | GRPC_ERROR_UNREF(state_error); |
| 572 | state = grpc_lb_policy_check_connectivity_locked(exec_ctx, new_lb_policy, |
| 573 | &state_error); |
| 574 | grpc_pollset_set_add_pollset_set(exec_ctx, |
| 575 | new_lb_policy->interested_parties, |
| 576 | chand->interested_parties); |
| 577 | GRPC_CLOSURE_LIST_SCHED(exec_ctx, |
| 578 | &chand->waiting_for_resolver_result_closures); |
| 579 | if (chand->exit_idle_when_lb_policy_arrives) { |
| 580 | grpc_lb_policy_exit_idle_locked(exec_ctx, new_lb_policy); |
| 581 | chand->exit_idle_when_lb_policy_arrives = false; |
| 582 | } |
| 583 | watch_lb_policy_locked(exec_ctx, chand, new_lb_policy, state); |
| 584 | } |
Mark D. Roth | 15494b5 | 2017-07-12 15:26:55 -0700 | [diff] [blame] | 585 | if (!lb_policy_updated) { |
| 586 | set_channel_connectivity_state_locked(exec_ctx, chand, state, |
| 587 | GRPC_ERROR_REF(state_error), |
| 588 | "new_lb+resolver"); |
| 589 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 590 | grpc_resolver_next_locked(exec_ctx, chand->resolver, |
| 591 | &chand->resolver_result, |
| 592 | &chand->on_resolver_result_changed); |
| 593 | GRPC_ERROR_UNREF(state_error); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 594 | } |
Craig Tiller | 3f47542 | 2015-06-25 10:43:05 -0700 | [diff] [blame] | 595 | } |
| 596 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 597 | static void start_transport_op_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 598 | grpc_error* error_ignored) { |
| 599 | grpc_transport_op* op = (grpc_transport_op*)arg; |
| 600 | grpc_channel_element* elem = |
| 601 | (grpc_channel_element*)op->handler_private.extra_arg; |
| 602 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 000cd8f | 2015-09-18 07:20:29 -0700 | [diff] [blame] | 603 | |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 604 | if (op->on_connectivity_state_change != nullptr) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 605 | grpc_connectivity_state_notify_on_state_change( |
| 606 | exec_ctx, &chand->state_tracker, op->connectivity_state, |
| 607 | op->on_connectivity_state_change); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 608 | op->on_connectivity_state_change = nullptr; |
| 609 | op->connectivity_state = nullptr; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 610 | } |
| 611 | |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 612 | if (op->send_ping != nullptr) { |
| 613 | if (chand->lb_policy == nullptr) { |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 614 | GRPC_CLOSURE_SCHED( |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 615 | exec_ctx, op->send_ping, |
| 616 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("Ping with no load balancing")); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 617 | } else { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 618 | grpc_lb_policy_ping_one_locked(exec_ctx, chand->lb_policy, op->send_ping); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 619 | op->bind_pollset = nullptr; |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 620 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 621 | op->send_ping = nullptr; |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 624 | if (op->disconnect_with_error != GRPC_ERROR_NONE) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 625 | if (chand->resolver != nullptr) { |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 626 | set_channel_connectivity_state_locked( |
Craig Tiller | d925c93 | 2016-06-06 08:38:50 -0700 | [diff] [blame] | 627 | exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN, |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 628 | GRPC_ERROR_REF(op->disconnect_with_error), "disconnect"); |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 629 | grpc_resolver_shutdown_locked(exec_ctx, chand->resolver); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 630 | GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 631 | chand->resolver = nullptr; |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 632 | if (!chand->started_resolving) { |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 633 | grpc_closure_list_fail_all(&chand->waiting_for_resolver_result_closures, |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 634 | GRPC_ERROR_REF(op->disconnect_with_error)); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 635 | GRPC_CLOSURE_LIST_SCHED(exec_ctx, |
| 636 | &chand->waiting_for_resolver_result_closures); |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 637 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 638 | if (chand->lb_policy != nullptr) { |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 639 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 640 | chand->lb_policy->interested_parties, |
| 641 | chand->interested_parties); |
| 642 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 643 | chand->lb_policy = nullptr; |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 644 | } |
Craig Tiller | b12d22a | 2016-04-23 12:50:21 -0700 | [diff] [blame] | 645 | } |
Craig Tiller | 1c51edc | 2016-05-07 16:18:43 -0700 | [diff] [blame] | 646 | GRPC_ERROR_UNREF(op->disconnect_with_error); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 647 | } |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 648 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "start_transport_op"); |
| 649 | |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 650 | GRPC_CLOSURE_SCHED(exec_ctx, op->on_consumed, GRPC_ERROR_NONE); |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 651 | } |
| 652 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 653 | static void cc_start_transport_op(grpc_exec_ctx* exec_ctx, |
| 654 | grpc_channel_element* elem, |
| 655 | grpc_transport_op* op) { |
| 656 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 657 | |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 658 | GPR_ASSERT(op->set_accept_stream == false); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 659 | if (op->bind_pollset != nullptr) { |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 660 | grpc_pollset_set_add_pollset(exec_ctx, chand->interested_parties, |
| 661 | op->bind_pollset); |
| 662 | } |
| 663 | |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 664 | op->handler_private.extra_arg = elem; |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 665 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "start_transport_op"); |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 666 | GRPC_CLOSURE_SCHED( |
Craig Tiller | c55c102 | 2017-03-10 10:26:42 -0800 | [diff] [blame] | 667 | exec_ctx, |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 668 | GRPC_CLOSURE_INIT(&op->handler_private.closure, start_transport_op_locked, |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 669 | op, grpc_combiner_scheduler(chand->combiner)), |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 670 | GRPC_ERROR_NONE); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 671 | } |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 672 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 673 | static void cc_get_channel_info(grpc_exec_ctx* exec_ctx, |
| 674 | grpc_channel_element* elem, |
| 675 | const grpc_channel_info* info) { |
| 676 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 677 | gpr_mu_lock(&chand->info_mu); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 678 | if (info->lb_policy_name != nullptr) { |
| 679 | *info->lb_policy_name = chand->info_lb_policy_name == nullptr |
| 680 | ? nullptr |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 681 | : gpr_strdup(chand->info_lb_policy_name); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 682 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 683 | if (info->service_config_json != nullptr) { |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 684 | *info->service_config_json = |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 685 | chand->info_service_config_json == nullptr |
| 686 | ? nullptr |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 687 | : gpr_strdup(chand->info_service_config_json); |
Mark D. Roth | c625c7a | 2016-11-09 14:12:37 -0800 | [diff] [blame] | 688 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 689 | gpr_mu_unlock(&chand->info_mu); |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 690 | } |
| 691 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 692 | /* Constructor for channel_data */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 693 | static grpc_error* cc_init_channel_elem(grpc_exec_ctx* exec_ctx, |
| 694 | grpc_channel_element* elem, |
| 695 | grpc_channel_element_args* args) { |
| 696 | channel_data* chand = (channel_data*)elem->channel_data; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 697 | GPR_ASSERT(args->is_last); |
| 698 | GPR_ASSERT(elem->filter == &grpc_client_channel_filter); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 699 | // Initialize data members. |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 700 | chand->combiner = grpc_combiner_create(); |
Craig Tiller | d8547751 | 2017-02-09 12:02:39 -0800 | [diff] [blame] | 701 | gpr_mu_init(&chand->info_mu); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 702 | gpr_mu_init(&chand->external_connectivity_watcher_list_mu); |
| 703 | |
| 704 | gpr_mu_lock(&chand->external_connectivity_watcher_list_mu); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 705 | chand->external_connectivity_watcher_list_head = nullptr; |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 706 | gpr_mu_unlock(&chand->external_connectivity_watcher_list_mu); |
| 707 | |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 708 | chand->owning_stack = args->channel_stack; |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 709 | GRPC_CLOSURE_INIT(&chand->on_resolver_result_changed, |
Craig Tiller | befafe6 | 2017-02-09 11:30:54 -0800 | [diff] [blame] | 710 | on_resolver_result_changed_locked, chand, |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 711 | grpc_combiner_scheduler(chand->combiner)); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 712 | chand->interested_parties = grpc_pollset_set_create(); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 713 | grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE, |
| 714 | "client_channel"); |
Yuchen Zeng | 6f9985e | 2017-10-10 19:00:01 -0700 | [diff] [blame] | 715 | grpc_client_channel_start_backup_polling(exec_ctx, chand->interested_parties); |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 716 | // Record client channel factory. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 717 | const grpc_arg* arg = grpc_channel_args_find(args->channel_args, |
Mark D. Roth | 21d4b2d | 2016-11-18 09:53:41 -0800 | [diff] [blame] | 718 | GRPC_ARG_CLIENT_CHANNEL_FACTORY); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 719 | if (arg == nullptr) { |
David Garcia Quintas | 228a514 | 2017-03-30 19:43:00 -0700 | [diff] [blame] | 720 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 721 | "Missing client channel factory in args for client channel filter"); |
| 722 | } |
| 723 | if (arg->type != GRPC_ARG_POINTER) { |
| 724 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 725 | "client channel factory arg must be a pointer"); |
| 726 | } |
Yash Tibrewal | bc130da | 2017-09-12 22:44:08 -0700 | [diff] [blame] | 727 | grpc_client_channel_factory_ref( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 728 | (grpc_client_channel_factory*)arg->value.pointer.p); |
Yash Tibrewal | ca3c1c0 | 2017-09-07 22:47:16 -0700 | [diff] [blame] | 729 | chand->client_channel_factory = |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 730 | (grpc_client_channel_factory*)arg->value.pointer.p; |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 731 | // Get server name to resolve, using proxy mapper if needed. |
Mark D. Roth | 86e9059 | 2016-11-18 09:56:40 -0800 | [diff] [blame] | 732 | arg = grpc_channel_args_find(args->channel_args, GRPC_ARG_SERVER_URI); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 733 | if (arg == nullptr) { |
David Garcia Quintas | 228a514 | 2017-03-30 19:43:00 -0700 | [diff] [blame] | 734 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 735 | "Missing server uri in args for client channel filter"); |
| 736 | } |
| 737 | if (arg->type != GRPC_ARG_STRING) { |
| 738 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 739 | "server uri arg must be a string"); |
| 740 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 741 | char* proxy_name = nullptr; |
| 742 | grpc_channel_args* new_args = nullptr; |
Mark D. Roth | dc9bee7 | 2017-02-07 12:29:14 -0800 | [diff] [blame] | 743 | grpc_proxy_mappers_map_name(exec_ctx, arg->value.string, args->channel_args, |
| 744 | &proxy_name, &new_args); |
| 745 | // Instantiate resolver. |
Mark D. Roth | 45ccec5 | 2017-01-18 14:04:01 -0800 | [diff] [blame] | 746 | chand->resolver = grpc_resolver_create( |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 747 | exec_ctx, proxy_name != nullptr ? proxy_name : arg->value.string, |
| 748 | new_args != nullptr ? new_args : args->channel_args, |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 749 | chand->interested_parties, chand->combiner); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 750 | if (proxy_name != nullptr) gpr_free(proxy_name); |
| 751 | if (new_args != nullptr) grpc_channel_args_destroy(exec_ctx, new_args); |
| 752 | if (chand->resolver == nullptr) { |
ncteisen | 4b36a3d | 2017-03-13 19:08:06 -0700 | [diff] [blame] | 753 | return GRPC_ERROR_CREATE_FROM_STATIC_STRING("resolver creation failed"); |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame] | 754 | } |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 755 | chand->deadline_checking_enabled = |
| 756 | grpc_deadline_checking_enabled(args->channel_args); |
Mark D. Roth | 5e2566e | 2016-11-18 10:53:13 -0800 | [diff] [blame] | 757 | return GRPC_ERROR_NONE; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 758 | } |
| 759 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 760 | static void shutdown_resolver_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 761 | grpc_error* error) { |
| 762 | grpc_resolver* resolver = (grpc_resolver*)arg; |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 763 | grpc_resolver_shutdown_locked(exec_ctx, resolver); |
| 764 | GRPC_RESOLVER_UNREF(exec_ctx, resolver, "channel"); |
| 765 | } |
| 766 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 767 | /* Destructor for channel_data */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 768 | static void cc_destroy_channel_elem(grpc_exec_ctx* exec_ctx, |
| 769 | grpc_channel_element* elem) { |
| 770 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 771 | if (chand->resolver != nullptr) { |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 772 | GRPC_CLOSURE_SCHED( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 773 | exec_ctx, |
| 774 | GRPC_CLOSURE_CREATE(shutdown_resolver_locked, chand->resolver, |
| 775 | grpc_combiner_scheduler(chand->combiner)), |
Craig Tiller | 972470b | 2017-02-09 15:05:36 -0800 | [diff] [blame] | 776 | GRPC_ERROR_NONE); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 777 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 778 | if (chand->client_channel_factory != nullptr) { |
Mark D. Roth | 0e48a9a | 2016-09-08 14:14:39 -0700 | [diff] [blame] | 779 | grpc_client_channel_factory_unref(exec_ctx, chand->client_channel_factory); |
| 780 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 781 | if (chand->lb_policy != nullptr) { |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 782 | grpc_pollset_set_del_pollset_set(exec_ctx, |
| 783 | chand->lb_policy->interested_parties, |
| 784 | chand->interested_parties); |
| 785 | GRPC_LB_POLICY_UNREF(exec_ctx, chand->lb_policy, "channel"); |
| 786 | } |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 787 | gpr_free(chand->info_lb_policy_name); |
| 788 | gpr_free(chand->info_service_config_json); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 789 | if (chand->retry_throttle_data != nullptr) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 790 | grpc_server_retry_throttle_data_unref(chand->retry_throttle_data); |
| 791 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 792 | if (chand->method_params_table != nullptr) { |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 793 | grpc_slice_hash_table_unref(exec_ctx, chand->method_params_table); |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 794 | } |
Yuchen Zeng | 0bad30a | 2017-10-05 21:47:39 -0700 | [diff] [blame] | 795 | grpc_client_channel_stop_backup_polling(exec_ctx, chand->interested_parties); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 796 | grpc_connectivity_state_destroy(exec_ctx, &chand->state_tracker); |
Craig Tiller | 9e5ac1b | 2017-02-14 22:25:50 -0800 | [diff] [blame] | 797 | grpc_pollset_set_destroy(exec_ctx, chand->interested_parties); |
Craig Tiller | f102167 | 2017-02-09 21:29:50 -0800 | [diff] [blame] | 798 | GRPC_COMBINER_UNREF(exec_ctx, chand->combiner, "client_channel"); |
Craig Tiller | d8547751 | 2017-02-09 12:02:39 -0800 | [diff] [blame] | 799 | gpr_mu_destroy(&chand->info_mu); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 800 | gpr_mu_destroy(&chand->external_connectivity_watcher_list_mu); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | /************************************************************************* |
| 804 | * PER-CALL FUNCTIONS |
| 805 | */ |
| 806 | |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 807 | // Max number of batches that can be pending on a call at any given |
| 808 | // time. This includes: |
| 809 | // recv_initial_metadata |
| 810 | // send_initial_metadata |
| 811 | // recv_message |
| 812 | // send_message |
| 813 | // recv_trailing_metadata |
| 814 | // send_trailing_metadata |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 815 | // We also add room for a single cancel_stream batch. |
| 816 | #define MAX_WAITING_BATCHES 7 |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 817 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 818 | /** Call data. Holds a pointer to grpc_subchannel_call and the |
| 819 | associated machinery to create such a pointer. |
| 820 | Handles queueing of stream ops until a call object is ready, waiting |
| 821 | for initial metadata before trying to create a call object, |
| 822 | and handling cancellation gracefully. */ |
| 823 | typedef struct client_channel_call_data { |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 824 | // State for handling deadlines. |
| 825 | // 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] | 826 | // TODO(roth): This is slightly sub-optimal in that grpc_deadline_state |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 827 | // and this struct both independently store pointers to the call stack |
| 828 | // and call combiner. If/when we have time, find a way to avoid this |
| 829 | // without breaking the grpc_deadline_state abstraction. |
Mark D. Roth | 72f6da8 | 2016-09-02 13:42:38 -0700 | [diff] [blame] | 830 | grpc_deadline_state deadline_state; |
Mark D. Roth | f28763c | 2016-09-14 15:18:40 -0700 | [diff] [blame] | 831 | |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 832 | grpc_slice path; // Request path. |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 833 | gpr_timespec call_start_time; |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 834 | grpc_millis deadline; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 835 | gpr_arena* arena; |
| 836 | grpc_call_stack* owning_call; |
| 837 | grpc_call_combiner* call_combiner; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 838 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 839 | grpc_server_retry_throttle_data* retry_throttle_data; |
| 840 | method_parameters* method_params; |
Mark D. Roth | aa850a7 | 2016-09-26 13:38:02 -0700 | [diff] [blame] | 841 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 842 | grpc_subchannel_call* subchannel_call; |
| 843 | grpc_error* error; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 844 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 845 | grpc_lb_policy* lb_policy; // Holds ref while LB pick is pending. |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 846 | grpc_closure lb_pick_closure; |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 847 | grpc_closure lb_pick_cancel_closure; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 848 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 849 | grpc_connected_subchannel* connected_subchannel; |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 850 | grpc_call_context_element subchannel_call_context[GRPC_CONTEXT_COUNT]; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 851 | grpc_polling_entity* pollent; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 852 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 853 | grpc_transport_stream_op_batch* waiting_for_pick_batches[MAX_WAITING_BATCHES]; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 854 | size_t waiting_for_pick_batches_count; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 855 | grpc_closure handle_pending_batch_in_call_combiner[MAX_WAITING_BATCHES]; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 856 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 857 | grpc_transport_stream_op_batch* initial_metadata_batch; |
David Garcia Quintas | d1a47f1 | 2016-09-02 12:46:44 +0200 | [diff] [blame] | 858 | |
| 859 | grpc_linked_mdelem lb_token_mdelem; |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 860 | |
| 861 | grpc_closure on_complete; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 862 | grpc_closure* original_on_complete; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 863 | } call_data; |
| 864 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 865 | grpc_subchannel_call* grpc_client_channel_get_subchannel_call( |
| 866 | grpc_call_element* elem) { |
| 867 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 868 | return calld->subchannel_call; |
Craig Tiller | 8b1d59c | 2016-12-27 15:15:30 -0800 | [diff] [blame] | 869 | } |
| 870 | |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 871 | // This is called via the call combiner, so access to calld is synchronized. |
| 872 | static void waiting_for_pick_batches_add( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 873 | call_data* calld, grpc_transport_stream_op_batch* batch) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 874 | if (batch->send_initial_metadata) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 875 | GPR_ASSERT(calld->initial_metadata_batch == nullptr); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 876 | calld->initial_metadata_batch = batch; |
| 877 | } else { |
| 878 | GPR_ASSERT(calld->waiting_for_pick_batches_count < MAX_WAITING_BATCHES); |
| 879 | calld->waiting_for_pick_batches[calld->waiting_for_pick_batches_count++] = |
| 880 | batch; |
| 881 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 884 | // This is called via the call combiner, so access to calld is synchronized. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 885 | static void fail_pending_batch_in_call_combiner(grpc_exec_ctx* exec_ctx, |
| 886 | void* arg, grpc_error* error) { |
| 887 | call_data* calld = (call_data*)arg; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 888 | if (calld->waiting_for_pick_batches_count > 0) { |
| 889 | --calld->waiting_for_pick_batches_count; |
| 890 | grpc_transport_stream_op_batch_finish_with_failure( |
| 891 | exec_ctx, |
| 892 | calld->waiting_for_pick_batches[calld->waiting_for_pick_batches_count], |
| 893 | GRPC_ERROR_REF(error), calld->call_combiner); |
| 894 | } |
| 895 | } |
| 896 | |
| 897 | // This is called via the call combiner, so access to calld is synchronized. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 898 | static void waiting_for_pick_batches_fail(grpc_exec_ctx* exec_ctx, |
| 899 | grpc_call_element* elem, |
| 900 | grpc_error* error) { |
| 901 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 902 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 903 | gpr_log(GPR_DEBUG, |
Mark D. Roth | e9b1083 | 2017-10-26 13:18:25 -0700 | [diff] [blame] | 904 | "chand=%p calld=%p: failing %" PRIuPTR " pending batches: %s", |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 905 | elem->channel_data, calld, calld->waiting_for_pick_batches_count, |
| 906 | grpc_error_string(error)); |
| 907 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 908 | for (size_t i = 0; i < calld->waiting_for_pick_batches_count; ++i) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 909 | GRPC_CLOSURE_INIT(&calld->handle_pending_batch_in_call_combiner[i], |
| 910 | fail_pending_batch_in_call_combiner, calld, |
| 911 | grpc_schedule_on_exec_ctx); |
| 912 | GRPC_CALL_COMBINER_START(exec_ctx, calld->call_combiner, |
| 913 | &calld->handle_pending_batch_in_call_combiner[i], |
| 914 | GRPC_ERROR_REF(error), |
| 915 | "waiting_for_pick_batches_fail"); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 916 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 917 | if (calld->initial_metadata_batch != nullptr) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 918 | grpc_transport_stream_op_batch_finish_with_failure( |
| 919 | exec_ctx, calld->initial_metadata_batch, GRPC_ERROR_REF(error), |
| 920 | calld->call_combiner); |
| 921 | } else { |
| 922 | GRPC_CALL_COMBINER_STOP(exec_ctx, calld->call_combiner, |
| 923 | "waiting_for_pick_batches_fail"); |
| 924 | } |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 925 | GRPC_ERROR_UNREF(error); |
| 926 | } |
| 927 | |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 928 | // This is called via the call combiner, so access to calld is synchronized. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 929 | static void run_pending_batch_in_call_combiner(grpc_exec_ctx* exec_ctx, |
| 930 | void* arg, grpc_error* ignored) { |
| 931 | call_data* calld = (call_data*)arg; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 932 | if (calld->waiting_for_pick_batches_count > 0) { |
| 933 | --calld->waiting_for_pick_batches_count; |
| 934 | grpc_subchannel_call_process_op( |
| 935 | exec_ctx, calld->subchannel_call, |
| 936 | calld->waiting_for_pick_batches[calld->waiting_for_pick_batches_count]); |
Craig Tiller | 57726ca | 2016-09-12 11:59:45 -0700 | [diff] [blame] | 937 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | // This is called via the call combiner, so access to calld is synchronized. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 941 | static void waiting_for_pick_batches_resume(grpc_exec_ctx* exec_ctx, |
| 942 | grpc_call_element* elem) { |
| 943 | channel_data* chand = (channel_data*)elem->channel_data; |
| 944 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 945 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 946 | gpr_log(GPR_DEBUG, |
| 947 | "chand=%p calld=%p: sending %" PRIuPTR |
| 948 | " pending batches to subchannel_call=%p", |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 949 | chand, calld, calld->waiting_for_pick_batches_count, |
| 950 | calld->subchannel_call); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 951 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 952 | for (size_t i = 0; i < calld->waiting_for_pick_batches_count; ++i) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 953 | GRPC_CLOSURE_INIT(&calld->handle_pending_batch_in_call_combiner[i], |
| 954 | run_pending_batch_in_call_combiner, calld, |
| 955 | grpc_schedule_on_exec_ctx); |
| 956 | GRPC_CALL_COMBINER_START(exec_ctx, calld->call_combiner, |
| 957 | &calld->handle_pending_batch_in_call_combiner[i], |
| 958 | GRPC_ERROR_NONE, |
| 959 | "waiting_for_pick_batches_resume"); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 960 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 961 | GPR_ASSERT(calld->initial_metadata_batch != nullptr); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 962 | grpc_subchannel_call_process_op(exec_ctx, calld->subchannel_call, |
| 963 | calld->initial_metadata_batch); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 964 | } |
| 965 | |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 966 | // Applies service config to the call. Must be invoked once we know |
| 967 | // that the resolver has returned results to the channel. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 968 | static void apply_service_config_to_call_locked(grpc_exec_ctx* exec_ctx, |
| 969 | grpc_call_element* elem) { |
| 970 | channel_data* chand = (channel_data*)elem->channel_data; |
| 971 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 972 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 973 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: applying service config to call", |
| 974 | chand, calld); |
| 975 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 976 | if (chand->retry_throttle_data != nullptr) { |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 977 | calld->retry_throttle_data = |
| 978 | grpc_server_retry_throttle_data_ref(chand->retry_throttle_data); |
| 979 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 980 | if (chand->method_params_table != nullptr) { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 981 | calld->method_params = (method_parameters*)grpc_method_config_table_get( |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 982 | exec_ctx, chand->method_params_table, calld->path); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 983 | if (calld->method_params != nullptr) { |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 984 | method_parameters_ref(calld->method_params); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 985 | // If the deadline from the service config is shorter than the one |
| 986 | // from the client API, reset the deadline timer. |
| 987 | if (chand->deadline_checking_enabled && |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 988 | calld->method_params->timeout != 0) { |
| 989 | const grpc_millis per_method_deadline = |
Craig Tiller | 9a8c3f3 | 2017-07-21 13:14:14 -0700 | [diff] [blame] | 990 | grpc_timespec_to_millis_round_up(calld->call_start_time) + |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 991 | calld->method_params->timeout; |
| 992 | if (per_method_deadline < calld->deadline) { |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 993 | calld->deadline = per_method_deadline; |
| 994 | grpc_deadline_state_reset(exec_ctx, elem, calld->deadline); |
| 995 | } |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 996 | } |
| 997 | } |
| 998 | } |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 999 | } |
Craig Tiller | ea4a4f1 | 2017-03-13 13:36:52 -0700 | [diff] [blame] | 1000 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1001 | static void create_subchannel_call_locked(grpc_exec_ctx* exec_ctx, |
| 1002 | grpc_call_element* elem, |
| 1003 | grpc_error* error) { |
| 1004 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1005 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1006 | const grpc_connected_subchannel_call_args call_args = { |
Yash Tibrewal | d8b84a2 | 2017-09-25 13:38:03 -0700 | [diff] [blame] | 1007 | calld->pollent, // pollent |
| 1008 | calld->path, // path |
| 1009 | calld->call_start_time, // start_time |
| 1010 | calld->deadline, // deadline |
| 1011 | calld->arena, // arena |
| 1012 | calld->subchannel_call_context, // context |
| 1013 | calld->call_combiner // call_combiner |
| 1014 | }; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1015 | grpc_error* new_error = grpc_connected_subchannel_create_call( |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1016 | exec_ctx, calld->connected_subchannel, &call_args, |
| 1017 | &calld->subchannel_call); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1018 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1019 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: create subchannel_call=%p: error=%s", |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1020 | chand, calld, calld->subchannel_call, grpc_error_string(new_error)); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1021 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1022 | if (new_error != GRPC_ERROR_NONE) { |
| 1023 | new_error = grpc_error_add_child(new_error, error); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1024 | waiting_for_pick_batches_fail(exec_ctx, elem, new_error); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1025 | } else { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1026 | waiting_for_pick_batches_resume(exec_ctx, elem); |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 1027 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1028 | GRPC_ERROR_UNREF(error); |
Craig Tiller | 11c17d4 | 2017-03-13 13:36:34 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1031 | // Invoked when a pick is completed, on both success or failure. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1032 | static void pick_done_locked(grpc_exec_ctx* exec_ctx, grpc_call_element* elem, |
| 1033 | grpc_error* error) { |
| 1034 | call_data* calld = (call_data*)elem->call_data; |
| 1035 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1036 | if (calld->connected_subchannel == nullptr) { |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1037 | // Failed to create subchannel. |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1038 | GRPC_ERROR_UNREF(calld->error); |
| 1039 | calld->error = error == GRPC_ERROR_NONE |
| 1040 | ? GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| 1041 | "Call dropped by load balancing policy") |
| 1042 | : GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 1043 | "Failed to create subchannel", &error, 1); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1044 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1045 | gpr_log(GPR_DEBUG, |
| 1046 | "chand=%p calld=%p: failed to create subchannel: error=%s", chand, |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1047 | calld, grpc_error_string(calld->error)); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1048 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1049 | waiting_for_pick_batches_fail(exec_ctx, elem, GRPC_ERROR_REF(calld->error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1050 | } else { |
Mark D. Roth | 9fe284e | 2016-09-12 11:22:27 -0700 | [diff] [blame] | 1051 | /* Create call on subchannel. */ |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1052 | create_subchannel_call_locked(exec_ctx, elem, GRPC_ERROR_REF(error)); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1053 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1054 | GRPC_ERROR_UNREF(error); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1055 | } |
| 1056 | |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1057 | // A wrapper around pick_done_locked() that is used in cases where |
| 1058 | // either (a) the pick was deferred pending a resolver result or (b) the |
| 1059 | // pick was done asynchronously. Removes the call's polling entity from |
| 1060 | // chand->interested_parties before invoking pick_done_locked(). |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1061 | static void async_pick_done_locked(grpc_exec_ctx* exec_ctx, |
| 1062 | grpc_call_element* elem, grpc_error* error) { |
| 1063 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1064 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1065 | grpc_polling_entity_del_from_pollset_set(exec_ctx, calld->pollent, |
| 1066 | chand->interested_parties); |
| 1067 | pick_done_locked(exec_ctx, elem, error); |
| 1068 | } |
| 1069 | |
| 1070 | // Note: This runs under the client_channel combiner, but will NOT be |
| 1071 | // holding the call combiner. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1072 | static void pick_callback_cancel_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 1073 | grpc_error* error) { |
| 1074 | grpc_call_element* elem = (grpc_call_element*)arg; |
| 1075 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1076 | call_data* calld = (call_data*)elem->call_data; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1077 | if (calld->lb_policy != nullptr) { |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1078 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1079 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: cancelling pick from LB policy %p", |
| 1080 | chand, calld, calld->lb_policy); |
| 1081 | } |
| 1082 | grpc_lb_policy_cancel_pick_locked(exec_ctx, calld->lb_policy, |
| 1083 | &calld->connected_subchannel, |
| 1084 | GRPC_ERROR_REF(error)); |
| 1085 | } |
| 1086 | GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_callback_cancel"); |
| 1087 | } |
| 1088 | |
| 1089 | // Callback invoked by grpc_lb_policy_pick_locked() for async picks. |
| 1090 | // Unrefs the LB policy and invokes async_pick_done_locked(). |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1091 | static void pick_callback_done_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 1092 | grpc_error* error) { |
| 1093 | grpc_call_element* elem = (grpc_call_element*)arg; |
| 1094 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1095 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1096 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1097 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: pick completed asynchronously", |
| 1098 | chand, calld); |
| 1099 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1100 | GPR_ASSERT(calld->lb_policy != nullptr); |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1101 | GRPC_LB_POLICY_UNREF(exec_ctx, calld->lb_policy, "pick_subchannel"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1102 | calld->lb_policy = nullptr; |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1103 | async_pick_done_locked(exec_ctx, elem, GRPC_ERROR_REF(error)); |
| 1104 | } |
| 1105 | |
| 1106 | // Takes a ref to chand->lb_policy and calls grpc_lb_policy_pick_locked(). |
| 1107 | // If the pick was completed synchronously, unrefs the LB policy and |
| 1108 | // returns true. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1109 | static bool pick_callback_start_locked(grpc_exec_ctx* exec_ctx, |
| 1110 | grpc_call_element* elem) { |
| 1111 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1112 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1113 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1114 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: starting pick on lb_policy=%p", |
| 1115 | chand, calld, chand->lb_policy); |
| 1116 | } |
| 1117 | apply_service_config_to_call_locked(exec_ctx, elem); |
| 1118 | // If the application explicitly set wait_for_ready, use that. |
| 1119 | // Otherwise, if the service config specified a value for this |
| 1120 | // method, use that. |
| 1121 | uint32_t initial_metadata_flags = |
| 1122 | calld->initial_metadata_batch->payload->send_initial_metadata |
| 1123 | .send_initial_metadata_flags; |
| 1124 | const bool wait_for_ready_set_from_api = |
| 1125 | initial_metadata_flags & |
| 1126 | GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET; |
| 1127 | const bool wait_for_ready_set_from_service_config = |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1128 | calld->method_params != nullptr && |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1129 | calld->method_params->wait_for_ready != WAIT_FOR_READY_UNSET; |
| 1130 | if (!wait_for_ready_set_from_api && wait_for_ready_set_from_service_config) { |
| 1131 | if (calld->method_params->wait_for_ready == WAIT_FOR_READY_TRUE) { |
| 1132 | initial_metadata_flags |= GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 1133 | } else { |
| 1134 | initial_metadata_flags &= ~GRPC_INITIAL_METADATA_WAIT_FOR_READY; |
| 1135 | } |
| 1136 | } |
| 1137 | const grpc_lb_policy_pick_args inputs = { |
| 1138 | calld->initial_metadata_batch->payload->send_initial_metadata |
| 1139 | .send_initial_metadata, |
| 1140 | initial_metadata_flags, &calld->lb_token_mdelem}; |
| 1141 | // Keep a ref to the LB policy in calld while the pick is pending. |
| 1142 | GRPC_LB_POLICY_REF(chand->lb_policy, "pick_subchannel"); |
| 1143 | calld->lb_policy = chand->lb_policy; |
| 1144 | GRPC_CLOSURE_INIT(&calld->lb_pick_closure, pick_callback_done_locked, elem, |
| 1145 | grpc_combiner_scheduler(chand->combiner)); |
| 1146 | const bool pick_done = grpc_lb_policy_pick_locked( |
| 1147 | exec_ctx, chand->lb_policy, &inputs, &calld->connected_subchannel, |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1148 | calld->subchannel_call_context, nullptr, &calld->lb_pick_closure); |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1149 | if (pick_done) { |
| 1150 | /* synchronous grpc_lb_policy_pick call. Unref the LB policy. */ |
| 1151 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1152 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: pick completed synchronously", |
| 1153 | chand, calld); |
| 1154 | } |
| 1155 | GRPC_LB_POLICY_UNREF(exec_ctx, calld->lb_policy, "pick_subchannel"); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1156 | calld->lb_policy = nullptr; |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1157 | } else { |
| 1158 | GRPC_CALL_STACK_REF(calld->owning_call, "pick_callback_cancel"); |
| 1159 | grpc_call_combiner_set_notify_on_cancel( |
| 1160 | exec_ctx, calld->call_combiner, |
| 1161 | GRPC_CLOSURE_INIT(&calld->lb_pick_cancel_closure, |
| 1162 | pick_callback_cancel_locked, elem, |
| 1163 | grpc_combiner_scheduler(chand->combiner))); |
| 1164 | } |
| 1165 | return pick_done; |
| 1166 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1167 | |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1168 | typedef struct { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1169 | grpc_call_element* elem; |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1170 | bool finished; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1171 | grpc_closure closure; |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1172 | grpc_closure cancel_closure; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1173 | } pick_after_resolver_result_args; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1174 | |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1175 | // Note: This runs under the client_channel combiner, but will NOT be |
| 1176 | // holding the call combiner. |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1177 | static void pick_after_resolver_result_cancel_locked(grpc_exec_ctx* exec_ctx, |
| 1178 | void* arg, |
| 1179 | grpc_error* error) { |
| 1180 | pick_after_resolver_result_args* args = (pick_after_resolver_result_args*)arg; |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1181 | if (args->finished) { |
| 1182 | gpr_free(args); |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1183 | return; |
Mark D. Roth | 764cf04 | 2017-09-01 09:00:06 -0700 | [diff] [blame] | 1184 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1185 | // If we don't yet have a resolver result, then a closure for |
| 1186 | // pick_after_resolver_result_done_locked() will have been added to |
| 1187 | // chand->waiting_for_resolver_result_closures, and it may not be invoked |
| 1188 | // until after this call has been destroyed. We mark the operation as |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1189 | // finished, so that when pick_after_resolver_result_done_locked() |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1190 | // is called, it will be a no-op. We also immediately invoke |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1191 | // async_pick_done_locked() to propagate the error back to the caller. |
| 1192 | args->finished = true; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1193 | grpc_call_element* elem = args->elem; |
| 1194 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1195 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1196 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1197 | gpr_log(GPR_DEBUG, |
| 1198 | "chand=%p calld=%p: cancelling pick waiting for resolver result", |
| 1199 | chand, calld); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1200 | } |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1201 | // Note: Although we are not in the call combiner here, we are |
| 1202 | // basically stealing the call combiner from the pending pick, so |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1203 | // it's safe to call async_pick_done_locked() here -- we are |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1204 | // essentially calling it here instead of calling it in |
| 1205 | // pick_after_resolver_result_done_locked(). |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1206 | async_pick_done_locked(exec_ctx, elem, |
| 1207 | GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| 1208 | "Pick cancelled", &error, 1)); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1209 | } |
| 1210 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1211 | static void pick_after_resolver_result_start_locked(grpc_exec_ctx* exec_ctx, |
| 1212 | grpc_call_element* elem); |
Mark D. Roth | 48be9de | 2017-10-23 12:27:37 -0700 | [diff] [blame] | 1213 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1214 | static void pick_after_resolver_result_done_locked(grpc_exec_ctx* exec_ctx, |
| 1215 | void* arg, |
| 1216 | grpc_error* error) { |
| 1217 | pick_after_resolver_result_args* args = (pick_after_resolver_result_args*)arg; |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1218 | if (args->finished) { |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1219 | /* cancelled, do nothing */ |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1220 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1221 | gpr_log(GPR_DEBUG, "call cancelled before resolver result"); |
| 1222 | } |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1223 | gpr_free(args); |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1224 | return; |
| 1225 | } |
| 1226 | args->finished = true; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1227 | grpc_call_element* elem = args->elem; |
| 1228 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1229 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1230 | if (error != GRPC_ERROR_NONE) { |
| 1231 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1232 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: resolver failed to return data", |
| 1233 | chand, calld); |
| 1234 | } |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1235 | async_pick_done_locked(exec_ctx, elem, GRPC_ERROR_REF(error)); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1236 | } else if (chand->lb_policy != nullptr) { |
Mark D. Roth | b2b9a0f | 2017-09-01 09:06:47 -0700 | [diff] [blame] | 1237 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1238 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: resolver returned, doing pick", |
| 1239 | chand, calld); |
| 1240 | } |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1241 | if (pick_callback_start_locked(exec_ctx, elem)) { |
| 1242 | // Even if the LB policy returns a result synchronously, we have |
| 1243 | // already added our polling entity to chand->interested_parties |
| 1244 | // in order to wait for the resolver result, so we need to |
| 1245 | // remove it here. Therefore, we call async_pick_done_locked() |
| 1246 | // instead of pick_done_locked(). |
| 1247 | async_pick_done_locked(exec_ctx, elem, GRPC_ERROR_NONE); |
Mark D. Roth | 9dab7d5 | 2016-10-07 07:48:03 -0700 | [diff] [blame] | 1248 | } |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1249 | } |
Mark D. Roth | 48be9de | 2017-10-23 12:27:37 -0700 | [diff] [blame] | 1250 | // TODO(roth): It should be impossible for chand->lb_policy to be NULL |
| 1251 | // here, so the rest of this code should never actually be executed. |
| 1252 | // However, we have reports of a crash on iOS that triggers this case, |
| 1253 | // so we are temporarily adding this to restore branches that were |
| 1254 | // removed in https://github.com/grpc/grpc/pull/12297. Need to figure |
| 1255 | // out what is actually causing this to occur and then figure out the |
| 1256 | // right way to deal with it. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1257 | else if (chand->resolver != nullptr) { |
Mark D. Roth | 48be9de | 2017-10-23 12:27:37 -0700 | [diff] [blame] | 1258 | // No LB policy, so try again. |
| 1259 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1260 | gpr_log(GPR_DEBUG, |
| 1261 | "chand=%p calld=%p: resolver returned but no LB policy, " |
| 1262 | "trying again", |
| 1263 | chand, calld); |
| 1264 | } |
| 1265 | pick_after_resolver_result_start_locked(exec_ctx, elem); |
| 1266 | } else { |
| 1267 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1268 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: resolver disconnected", chand, |
| 1269 | calld); |
| 1270 | } |
| 1271 | async_pick_done_locked( |
| 1272 | exec_ctx, elem, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Disconnected")); |
| 1273 | } |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1274 | } |
| 1275 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1276 | static void pick_after_resolver_result_start_locked(grpc_exec_ctx* exec_ctx, |
| 1277 | grpc_call_element* elem) { |
| 1278 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1279 | call_data* calld = (call_data*)elem->call_data; |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1280 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1281 | gpr_log(GPR_DEBUG, |
| 1282 | "chand=%p calld=%p: deferring pick pending resolver result", chand, |
| 1283 | calld); |
Mark D. Roth | 64a317c | 2017-05-02 08:27:08 -0700 | [diff] [blame] | 1284 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1285 | pick_after_resolver_result_args* args = |
| 1286 | (pick_after_resolver_result_args*)gpr_zalloc(sizeof(*args)); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1287 | args->elem = elem; |
| 1288 | GRPC_CLOSURE_INIT(&args->closure, pick_after_resolver_result_done_locked, |
| 1289 | args, grpc_combiner_scheduler(chand->combiner)); |
| 1290 | grpc_closure_list_append(&chand->waiting_for_resolver_result_closures, |
| 1291 | &args->closure, GRPC_ERROR_NONE); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1292 | grpc_call_combiner_set_notify_on_cancel( |
| 1293 | exec_ctx, calld->call_combiner, |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1294 | GRPC_CLOSURE_INIT(&args->cancel_closure, |
| 1295 | pick_after_resolver_result_cancel_locked, args, |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1296 | grpc_combiner_scheduler(chand->combiner))); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1297 | } |
| 1298 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1299 | static void start_pick_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 1300 | grpc_error* ignored) { |
| 1301 | grpc_call_element* elem = (grpc_call_element*)arg; |
| 1302 | call_data* calld = (call_data*)elem->call_data; |
| 1303 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1304 | GPR_ASSERT(calld->connected_subchannel == nullptr); |
| 1305 | if (chand->lb_policy != nullptr) { |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1306 | // We already have an LB policy, so ask it for a pick. |
| 1307 | if (pick_callback_start_locked(exec_ctx, elem)) { |
| 1308 | // Pick completed synchronously. |
| 1309 | pick_done_locked(exec_ctx, elem, GRPC_ERROR_NONE); |
| 1310 | return; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1311 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1312 | } else { |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1313 | // We do not yet have an LB policy, so wait for a resolver result. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1314 | if (chand->resolver == nullptr) { |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1315 | pick_done_locked(exec_ctx, elem, |
| 1316 | GRPC_ERROR_CREATE_FROM_STATIC_STRING("Disconnected")); |
| 1317 | return; |
| 1318 | } |
| 1319 | if (!chand->started_resolving) { |
| 1320 | start_resolving_locked(exec_ctx, chand); |
| 1321 | } |
| 1322 | pick_after_resolver_result_start_locked(exec_ctx, elem); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1323 | } |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1324 | // We need to wait for either a resolver result or for an async result |
| 1325 | // from the LB policy. Add the polling entity from call_data to the |
| 1326 | // channel_data's interested_parties, so that the I/O of the LB policy |
| 1327 | // and resolver can be done under it. The polling entity will be |
| 1328 | // removed in async_pick_done_locked(). |
| 1329 | grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent, |
| 1330 | chand->interested_parties); |
Craig Tiller | a11bfc8 | 2017-02-14 09:56:33 -0800 | [diff] [blame] | 1331 | } |
| 1332 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1333 | static void on_complete(grpc_exec_ctx* exec_ctx, void* arg, grpc_error* error) { |
| 1334 | grpc_call_element* elem = (grpc_call_element*)arg; |
| 1335 | call_data* calld = (call_data*)elem->call_data; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1336 | if (calld->retry_throttle_data != nullptr) { |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1337 | if (error == GRPC_ERROR_NONE) { |
| 1338 | grpc_server_retry_throttle_data_record_success( |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 1339 | calld->retry_throttle_data); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1340 | } else { |
| 1341 | // 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] | 1342 | // decide whether or not to retry. Note that we should only |
| 1343 | // record failures whose statuses match the configured retryable |
| 1344 | // or non-fatal status codes. |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1345 | grpc_server_retry_throttle_data_record_failure( |
Mark D. Roth | 9ccbc4d | 2017-03-15 08:30:04 -0700 | [diff] [blame] | 1346 | calld->retry_throttle_data); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1347 | } |
| 1348 | } |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1349 | GRPC_CLOSURE_RUN(exec_ctx, calld->original_on_complete, |
Mark D. Roth | 95039b5 | 2017-02-24 07:59:45 -0800 | [diff] [blame] | 1350 | GRPC_ERROR_REF(error)); |
Mark D. Roth | d6d192d | 2017-02-23 08:58:42 -0800 | [diff] [blame] | 1351 | } |
| 1352 | |
Craig Tiller | e1b51da | 2017-03-31 15:44:33 -0700 | [diff] [blame] | 1353 | static void cc_start_transport_stream_op_batch( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1354 | grpc_exec_ctx* exec_ctx, grpc_call_element* elem, |
| 1355 | grpc_transport_stream_op_batch* batch) { |
| 1356 | call_data* calld = (call_data*)elem->call_data; |
| 1357 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1358 | if (chand->deadline_checking_enabled) { |
Craig Tiller | 29ebc57 | 2017-04-04 08:00:55 -0700 | [diff] [blame] | 1359 | grpc_deadline_state_client_start_transport_stream_op_batch(exec_ctx, elem, |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1360 | batch); |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1361 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1362 | GPR_TIMER_BEGIN("cc_start_transport_stream_op_batch", 0); |
| 1363 | // If we've previously been cancelled, immediately fail any new batches. |
| 1364 | if (calld->error != GRPC_ERROR_NONE) { |
| 1365 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1366 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: failing batch with error: %s", |
| 1367 | chand, calld, grpc_error_string(calld->error)); |
| 1368 | } |
| 1369 | grpc_transport_stream_op_batch_finish_with_failure( |
| 1370 | exec_ctx, batch, GRPC_ERROR_REF(calld->error), calld->call_combiner); |
| 1371 | goto done; |
| 1372 | } |
| 1373 | if (batch->cancel_stream) { |
| 1374 | // Stash a copy of cancel_error in our call data, so that we can use |
| 1375 | // it for subsequent operations. This ensures that if the call is |
| 1376 | // cancelled before any batches are passed down (e.g., if the deadline |
| 1377 | // is in the past when the call starts), we can return the right |
| 1378 | // error to the caller when the first batch does get passed down. |
| 1379 | GRPC_ERROR_UNREF(calld->error); |
| 1380 | calld->error = GRPC_ERROR_REF(batch->payload->cancel_stream.cancel_error); |
| 1381 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1382 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: recording cancel_error=%s", chand, |
| 1383 | calld, grpc_error_string(calld->error)); |
| 1384 | } |
| 1385 | // If we have a subchannel call, send the cancellation batch down. |
| 1386 | // Otherwise, fail all pending batches. |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1387 | if (calld->subchannel_call != nullptr) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1388 | grpc_subchannel_call_process_op(exec_ctx, calld->subchannel_call, batch); |
| 1389 | } else { |
| 1390 | waiting_for_pick_batches_add(calld, batch); |
| 1391 | waiting_for_pick_batches_fail(exec_ctx, elem, |
| 1392 | GRPC_ERROR_REF(calld->error)); |
| 1393 | } |
| 1394 | goto done; |
| 1395 | } |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1396 | // Intercept on_complete for recv_trailing_metadata so that we can |
| 1397 | // check retry throttle status. |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1398 | if (batch->recv_trailing_metadata) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1399 | GPR_ASSERT(batch->on_complete != nullptr); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1400 | calld->original_on_complete = batch->on_complete; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1401 | GRPC_CLOSURE_INIT(&calld->on_complete, on_complete, elem, |
| 1402 | grpc_schedule_on_exec_ctx); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1403 | batch->on_complete = &calld->on_complete; |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1404 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1405 | // Check if we've already gotten a subchannel call. |
| 1406 | // Note that once we have completed the pick, we do not need to enter |
| 1407 | // the channel combiner, which is more efficient (especially for |
| 1408 | // streaming calls). |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1409 | if (calld->subchannel_call != nullptr) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1410 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1411 | gpr_log(GPR_DEBUG, |
| 1412 | "chand=%p calld=%p: sending batch to subchannel_call=%p", chand, |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1413 | calld, calld->subchannel_call); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1414 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1415 | grpc_subchannel_call_process_op(exec_ctx, calld->subchannel_call, batch); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1416 | goto done; |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1417 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1418 | // We do not yet have a subchannel call. |
| 1419 | // Add the batch to the waiting-for-pick list. |
| 1420 | waiting_for_pick_batches_add(calld, batch); |
| 1421 | // For batches containing a send_initial_metadata op, enter the channel |
| 1422 | // combiner to start a pick. |
| 1423 | if (batch->send_initial_metadata) { |
| 1424 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
Mark D. Roth | b292960 | 2017-09-11 09:31:11 -0700 | [diff] [blame] | 1425 | gpr_log(GPR_DEBUG, "chand=%p calld=%p: entering client_channel combiner", |
| 1426 | chand, calld); |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1427 | } |
| 1428 | GRPC_CLOSURE_SCHED( |
| 1429 | exec_ctx, |
| 1430 | GRPC_CLOSURE_INIT(&batch->handler_private.closure, start_pick_locked, |
| 1431 | elem, grpc_combiner_scheduler(chand->combiner)), |
| 1432 | GRPC_ERROR_NONE); |
| 1433 | } else { |
| 1434 | // For all other batches, release the call combiner. |
| 1435 | if (GRPC_TRACER_ON(grpc_client_channel_trace)) { |
| 1436 | gpr_log(GPR_DEBUG, |
| 1437 | "chand=%p calld=%p: saved batch, yeilding call combiner", chand, |
| 1438 | calld); |
| 1439 | } |
| 1440 | GRPC_CALL_COMBINER_STOP(exec_ctx, calld->call_combiner, |
| 1441 | "batch does not include send_initial_metadata"); |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1442 | } |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1443 | done: |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1444 | GPR_TIMER_END("cc_start_transport_stream_op_batch", 0); |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1445 | } |
| 1446 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1447 | /* Constructor for call_data */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1448 | static grpc_error* cc_init_call_elem(grpc_exec_ctx* exec_ctx, |
| 1449 | grpc_call_element* elem, |
| 1450 | const grpc_call_element_args* args) { |
| 1451 | call_data* calld = (call_data*)elem->call_data; |
| 1452 | channel_data* chand = (channel_data*)elem->channel_data; |
Mark D. Roth | e40dd29 | 2016-10-05 14:58:37 -0700 | [diff] [blame] | 1453 | // Initialize data members. |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1454 | calld->path = grpc_slice_ref_internal(args->path); |
Mark D. Roth | ff08f33 | 2016-10-14 13:01:01 -0700 | [diff] [blame] | 1455 | calld->call_start_time = args->start_time; |
Craig Tiller | 89c1428 | 2017-07-19 15:32:27 -0700 | [diff] [blame] | 1456 | calld->deadline = args->deadline; |
Craig Tiller | d426cac | 2017-03-13 12:30:45 -0700 | [diff] [blame] | 1457 | calld->arena = args->arena; |
Mark D. Roth | 66f3d2b | 2017-09-01 09:02:17 -0700 | [diff] [blame] | 1458 | calld->owning_call = args->call_stack; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1459 | calld->call_combiner = args->call_combiner; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1460 | if (chand->deadline_checking_enabled) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1461 | grpc_deadline_state_init(exec_ctx, elem, args->call_stack, |
| 1462 | args->call_combiner, calld->deadline); |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1463 | } |
Mark D. Roth | 0badbe8 | 2016-06-23 10:15:12 -0700 | [diff] [blame] | 1464 | return GRPC_ERROR_NONE; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1465 | } |
| 1466 | |
| 1467 | /* Destructor for call_data */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1468 | static void cc_destroy_call_elem(grpc_exec_ctx* exec_ctx, |
| 1469 | grpc_call_element* elem, |
| 1470 | const grpc_call_final_info* final_info, |
| 1471 | grpc_closure* then_schedule_closure) { |
| 1472 | call_data* calld = (call_data*)elem->call_data; |
| 1473 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | 3be7dd0 | 2017-04-03 14:30:03 -0700 | [diff] [blame] | 1474 | if (chand->deadline_checking_enabled) { |
| 1475 | grpc_deadline_state_destroy(exec_ctx, elem); |
| 1476 | } |
Craig Tiller | 7c70b6c | 2017-01-23 07:48:42 -0800 | [diff] [blame] | 1477 | grpc_slice_unref_internal(exec_ctx, calld->path); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1478 | if (calld->method_params != nullptr) { |
Mark D. Roth | 95b627b | 2017-02-24 11:02:58 -0800 | [diff] [blame] | 1479 | method_parameters_unref(calld->method_params); |
| 1480 | } |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1481 | GRPC_ERROR_UNREF(calld->error); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1482 | if (calld->subchannel_call != nullptr) { |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1483 | grpc_subchannel_call_set_cleanup_closure(calld->subchannel_call, |
Craig Tiller | f7c8c9f | 2017-05-17 15:22:05 -0700 | [diff] [blame] | 1484 | then_schedule_closure); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1485 | then_schedule_closure = nullptr; |
Mark D. Roth | 76e264b | 2017-08-25 09:03:33 -0700 | [diff] [blame] | 1486 | GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, calld->subchannel_call, |
Craig Tiller | f7c8c9f | 2017-05-17 15:22:05 -0700 | [diff] [blame] | 1487 | "client_channel_destroy_call"); |
Mark D. Roth | 4c0fe49 | 2016-08-31 13:51:55 -0700 | [diff] [blame] | 1488 | } |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1489 | GPR_ASSERT(calld->lb_policy == nullptr); |
Mark D. Roth | 0ca0be8 | 2017-06-20 07:49:33 -0700 | [diff] [blame] | 1490 | GPR_ASSERT(calld->waiting_for_pick_batches_count == 0); |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1491 | if (calld->connected_subchannel != nullptr) { |
Craig Tiller | 693d394 | 2016-10-27 16:51:25 -0700 | [diff] [blame] | 1492 | GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, calld->connected_subchannel, |
| 1493 | "picked"); |
| 1494 | } |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1495 | for (size_t i = 0; i < GRPC_CONTEXT_COUNT; ++i) { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1496 | if (calld->subchannel_call_context[i].value != nullptr) { |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 1497 | calld->subchannel_call_context[i].destroy( |
| 1498 | calld->subchannel_call_context[i].value); |
| 1499 | } |
| 1500 | } |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1501 | GRPC_CLOSURE_SCHED(exec_ctx, then_schedule_closure, GRPC_ERROR_NONE); |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1502 | } |
| 1503 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1504 | static void cc_set_pollset_or_pollset_set(grpc_exec_ctx* exec_ctx, |
| 1505 | grpc_call_element* elem, |
| 1506 | grpc_polling_entity* pollent) { |
| 1507 | call_data* calld = (call_data*)elem->call_data; |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 1508 | calld->pollent = pollent; |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 1509 | } |
| 1510 | |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1511 | /************************************************************************* |
| 1512 | * EXPORTED SYMBOLS |
| 1513 | */ |
| 1514 | |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1515 | const grpc_channel_filter grpc_client_channel_filter = { |
Craig Tiller | a0f3abd | 2017-03-31 15:42:16 -0700 | [diff] [blame] | 1516 | cc_start_transport_stream_op_batch, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1517 | cc_start_transport_op, |
| 1518 | sizeof(call_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1519 | cc_init_call_elem, |
David Garcia Quintas | 4afce7e | 2016-04-18 16:25:17 -0700 | [diff] [blame] | 1520 | cc_set_pollset_or_pollset_set, |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1521 | cc_destroy_call_elem, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1522 | sizeof(channel_data), |
Mark D. Roth | 2a5959f | 2016-09-01 08:20:27 -0700 | [diff] [blame] | 1523 | cc_init_channel_elem, |
| 1524 | cc_destroy_channel_elem, |
Mark D. Roth | b2d2488 | 2016-10-27 15:44:07 -0700 | [diff] [blame] | 1525 | cc_get_channel_info, |
Craig Tiller | f40df23 | 2016-03-25 13:38:14 -0700 | [diff] [blame] | 1526 | "client-channel", |
Craig Tiller | 87d5b19 | 2015-04-16 14:37:57 -0700 | [diff] [blame] | 1527 | }; |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1528 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1529 | static void try_to_connect_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 1530 | grpc_error* error_ignored) { |
| 1531 | channel_data* chand = (channel_data*)arg; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1532 | if (chand->lb_policy != nullptr) { |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 1533 | grpc_lb_policy_exit_idle_locked(exec_ctx, chand->lb_policy); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1534 | } else { |
| 1535 | chand->exit_idle_when_lb_policy_arrives = true; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1536 | if (!chand->started_resolving && chand->resolver != nullptr) { |
Mark D. Roth | 60751fe | 2017-07-07 12:50:33 -0700 | [diff] [blame] | 1537 | start_resolving_locked(exec_ctx, chand); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1538 | } |
| 1539 | } |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1540 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "try_to_connect"); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1541 | } |
| 1542 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1543 | grpc_connectivity_state grpc_client_channel_check_connectivity_state( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1544 | grpc_exec_ctx* exec_ctx, grpc_channel_element* elem, int try_to_connect) { |
| 1545 | channel_data* chand = (channel_data*)elem->channel_data; |
Craig Tiller | a8610c0 | 2017-02-14 10:05:11 -0800 | [diff] [blame] | 1546 | grpc_connectivity_state out = |
| 1547 | grpc_connectivity_state_check(&chand->state_tracker); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1548 | if (out == GRPC_CHANNEL_IDLE && try_to_connect) { |
Craig Tiller | d2e5cfc | 2017-02-09 13:02:20 -0800 | [diff] [blame] | 1549 | GRPC_CHANNEL_STACK_REF(chand->owning_stack, "try_to_connect"); |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1550 | GRPC_CLOSURE_SCHED( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1551 | exec_ctx, |
| 1552 | GRPC_CLOSURE_CREATE(try_to_connect_locked, chand, |
| 1553 | grpc_combiner_scheduler(chand->combiner)), |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1554 | GRPC_ERROR_NONE); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1555 | } |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1556 | return out; |
| 1557 | } |
| 1558 | |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1559 | typedef struct external_connectivity_watcher { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1560 | channel_data* chand; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1561 | grpc_polling_entity pollent; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1562 | grpc_closure* on_complete; |
| 1563 | grpc_closure* watcher_timer_init; |
| 1564 | grpc_connectivity_state* state; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1565 | grpc_closure my_closure; |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1566 | struct external_connectivity_watcher* next; |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1567 | } external_connectivity_watcher; |
| 1568 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1569 | static external_connectivity_watcher* lookup_external_connectivity_watcher( |
| 1570 | channel_data* chand, grpc_closure* on_complete) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1571 | gpr_mu_lock(&chand->external_connectivity_watcher_list_mu); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1572 | external_connectivity_watcher* w = |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1573 | chand->external_connectivity_watcher_list_head; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1574 | while (w != nullptr && w->on_complete != on_complete) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1575 | w = w->next; |
| 1576 | } |
| 1577 | gpr_mu_unlock(&chand->external_connectivity_watcher_list_mu); |
| 1578 | return w; |
| 1579 | } |
| 1580 | |
| 1581 | static void external_connectivity_watcher_list_append( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1582 | channel_data* chand, external_connectivity_watcher* w) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1583 | GPR_ASSERT(!lookup_external_connectivity_watcher(chand, w->on_complete)); |
| 1584 | |
| 1585 | gpr_mu_lock(&w->chand->external_connectivity_watcher_list_mu); |
| 1586 | GPR_ASSERT(!w->next); |
| 1587 | w->next = chand->external_connectivity_watcher_list_head; |
| 1588 | chand->external_connectivity_watcher_list_head = w; |
| 1589 | gpr_mu_unlock(&w->chand->external_connectivity_watcher_list_mu); |
| 1590 | } |
| 1591 | |
| 1592 | static void external_connectivity_watcher_list_remove( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1593 | channel_data* chand, external_connectivity_watcher* too_remove) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1594 | GPR_ASSERT( |
| 1595 | lookup_external_connectivity_watcher(chand, too_remove->on_complete)); |
| 1596 | gpr_mu_lock(&chand->external_connectivity_watcher_list_mu); |
| 1597 | if (too_remove == chand->external_connectivity_watcher_list_head) { |
| 1598 | chand->external_connectivity_watcher_list_head = too_remove->next; |
| 1599 | gpr_mu_unlock(&chand->external_connectivity_watcher_list_mu); |
| 1600 | return; |
| 1601 | } |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1602 | external_connectivity_watcher* w = |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1603 | chand->external_connectivity_watcher_list_head; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1604 | while (w != nullptr) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1605 | if (w->next == too_remove) { |
| 1606 | w->next = w->next->next; |
| 1607 | gpr_mu_unlock(&chand->external_connectivity_watcher_list_mu); |
| 1608 | return; |
| 1609 | } |
| 1610 | w = w->next; |
| 1611 | } |
| 1612 | GPR_UNREACHABLE_CODE(return ); |
| 1613 | } |
| 1614 | |
| 1615 | int grpc_client_channel_num_external_connectivity_watchers( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1616 | grpc_channel_element* elem) { |
| 1617 | channel_data* chand = (channel_data*)elem->channel_data; |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1618 | int count = 0; |
| 1619 | |
| 1620 | gpr_mu_lock(&chand->external_connectivity_watcher_list_mu); |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1621 | external_connectivity_watcher* w = |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1622 | chand->external_connectivity_watcher_list_head; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1623 | while (w != nullptr) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1624 | count++; |
| 1625 | w = w->next; |
| 1626 | } |
| 1627 | gpr_mu_unlock(&chand->external_connectivity_watcher_list_mu); |
| 1628 | |
| 1629 | return count; |
| 1630 | } |
| 1631 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1632 | static void on_external_watch_complete_locked(grpc_exec_ctx* exec_ctx, |
| 1633 | void* arg, grpc_error* error) { |
| 1634 | external_connectivity_watcher* w = (external_connectivity_watcher*)arg; |
| 1635 | grpc_closure* follow_up = w->on_complete; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1636 | grpc_polling_entity_del_from_pollset_set(exec_ctx, &w->pollent, |
| 1637 | w->chand->interested_parties); |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1638 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, |
| 1639 | "external_connectivity_watcher"); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1640 | external_connectivity_watcher_list_remove(w->chand, w); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1641 | gpr_free(w); |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1642 | GRPC_CLOSURE_RUN(exec_ctx, follow_up, GRPC_ERROR_REF(error)); |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1643 | } |
| 1644 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1645 | static void watch_connectivity_state_locked(grpc_exec_ctx* exec_ctx, void* arg, |
| 1646 | grpc_error* error_ignored) { |
| 1647 | external_connectivity_watcher* w = (external_connectivity_watcher*)arg; |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1648 | external_connectivity_watcher* found = nullptr; |
| 1649 | if (w->state != nullptr) { |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1650 | external_connectivity_watcher_list_append(w->chand, w); |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1651 | GRPC_CLOSURE_RUN(exec_ctx, w->watcher_timer_init, GRPC_ERROR_NONE); |
Alexander Polcyn | 2004e39 | 2017-10-16 15:14:46 -0700 | [diff] [blame] | 1652 | GRPC_CLOSURE_INIT(&w->my_closure, on_external_watch_complete_locked, w, |
| 1653 | grpc_combiner_scheduler(w->chand->combiner)); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1654 | grpc_connectivity_state_notify_on_state_change( |
| 1655 | exec_ctx, &w->chand->state_tracker, w->state, &w->my_closure); |
| 1656 | } else { |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1657 | GPR_ASSERT(w->watcher_timer_init == nullptr); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1658 | found = lookup_external_connectivity_watcher(w->chand, w->on_complete); |
| 1659 | if (found) { |
| 1660 | GPR_ASSERT(found->on_complete == w->on_complete); |
| 1661 | grpc_connectivity_state_notify_on_state_change( |
Craig Tiller | 4782d92 | 2017-11-10 09:53:21 -0800 | [diff] [blame] | 1662 | exec_ctx, &found->chand->state_tracker, nullptr, &found->my_closure); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1663 | } |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1664 | grpc_polling_entity_del_from_pollset_set(exec_ctx, &w->pollent, |
| 1665 | w->chand->interested_parties); |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1666 | GRPC_CHANNEL_STACK_UNREF(exec_ctx, w->chand->owning_stack, |
| 1667 | "external_connectivity_watcher"); |
| 1668 | gpr_free(w); |
| 1669 | } |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1670 | } |
| 1671 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 1672 | void grpc_client_channel_watch_connectivity_state( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 1673 | grpc_exec_ctx* exec_ctx, grpc_channel_element* elem, |
| 1674 | grpc_polling_entity pollent, grpc_connectivity_state* state, |
| 1675 | grpc_closure* closure, grpc_closure* watcher_timer_init) { |
| 1676 | channel_data* chand = (channel_data*)elem->channel_data; |
| 1677 | external_connectivity_watcher* w = |
| 1678 | (external_connectivity_watcher*)gpr_zalloc(sizeof(*w)); |
Craig Tiller | 86c9958 | 2015-11-25 15:22:26 -0800 | [diff] [blame] | 1679 | w->chand = chand; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1680 | w->pollent = pollent; |
Mark D. Roth | 9221083 | 2017-05-02 15:04:39 -0700 | [diff] [blame] | 1681 | w->on_complete = closure; |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1682 | w->state = state; |
Alexander Polcyn | c3b1f18 | 2017-04-18 13:51:36 -0700 | [diff] [blame] | 1683 | w->watcher_timer_init = watcher_timer_init; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 1684 | grpc_polling_entity_add_to_pollset_set(exec_ctx, &w->pollent, |
| 1685 | chand->interested_parties); |
Craig Tiller | 1d881fb | 2015-12-01 07:39:04 -0800 | [diff] [blame] | 1686 | GRPC_CHANNEL_STACK_REF(w->chand->owning_stack, |
| 1687 | "external_connectivity_watcher"); |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1688 | GRPC_CLOSURE_SCHED( |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1689 | exec_ctx, |
ncteisen | 274bbbe | 2017-06-08 14:57:11 -0700 | [diff] [blame] | 1690 | GRPC_CLOSURE_INIT(&w->my_closure, watch_connectivity_state_locked, w, |
Craig Tiller | ee4b145 | 2017-05-12 10:56:03 -0700 | [diff] [blame] | 1691 | grpc_combiner_scheduler(chand->combiner)), |
Craig Tiller | 613dafa | 2017-02-09 12:00:43 -0800 | [diff] [blame] | 1692 | GRPC_ERROR_NONE); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 1693 | } |