Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2015 gRPC authors. |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [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 |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [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. |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
Craig Tiller | d608cd6 | 2017-04-02 16:23:17 -0700 | [diff] [blame] | 19 | #ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_H |
| 20 | #define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_H |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 21 | |
Craig Tiller | 9eb0fde | 2017-03-31 16:59:30 -0700 | [diff] [blame] | 22 | #include "src/core/ext/filters/client_channel/subchannel.h" |
David Garcia Quintas | 2a50dfe | 2016-05-31 15:09:12 -0700 | [diff] [blame] | 23 | #include "src/core/lib/iomgr/polling_entity.h" |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 24 | #include "src/core/lib/transport/connectivity_state.h" |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 25 | |
| 26 | /** A load balancing policy: specified by a vtable and a struct (which |
| 27 | is expected to be extended to contain some parameters) */ |
| 28 | typedef struct grpc_lb_policy grpc_lb_policy; |
| 29 | typedef struct grpc_lb_policy_vtable grpc_lb_policy_vtable; |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 30 | typedef struct grpc_lb_policy_args grpc_lb_policy_args; |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 31 | |
ncteisen | 05294b6 | 2017-11-10 16:57:53 -0800 | [diff] [blame] | 32 | extern grpc_core::DebugOnlyTraceFlag grpc_trace_lb_policy_refcount; |
ncteisen | 9c43fc0 | 2017-06-08 16:06:23 -0700 | [diff] [blame] | 33 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 34 | struct grpc_lb_policy { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 35 | const grpc_lb_policy_vtable* vtable; |
Craig Tiller | 4861304 | 2015-11-29 14:45:11 -0800 | [diff] [blame] | 36 | gpr_atm ref_pair; |
Craig Tiller | 69b093b | 2016-02-25 19:04:07 -0800 | [diff] [blame] | 37 | /* owned pointer to interested parties in load balancing decisions */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 38 | grpc_pollset_set* interested_parties; |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 39 | /* combiner under which lb_policy actions take place */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 40 | grpc_combiner* combiner; |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 41 | /* callback to force a re-resolution */ |
| 42 | grpc_closure* request_reresolution; |
Craig Tiller | 7c0b4d7 | 2015-06-25 14:44:44 -0700 | [diff] [blame] | 43 | }; |
| 44 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 45 | /** Extra arguments for an LB pick */ |
| 46 | typedef struct grpc_lb_policy_pick_args { |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 47 | /** Initial metadata associated with the picking call. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 48 | grpc_metadata_batch* initial_metadata; |
David Garcia Quintas | 92eb6b9 | 2016-09-30 14:07:39 -0700 | [diff] [blame] | 49 | /** Bitmask used for selective cancelling. See \a |
| 50 | * grpc_lb_policy_cancel_picks() and \a GRPC_INITIAL_METADATA_* in |
| 51 | * grpc_types.h */ |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 52 | uint32_t initial_metadata_flags; |
David Garcia Quintas | 5b0e946 | 2016-08-15 19:38:39 -0700 | [diff] [blame] | 53 | /** Storage for LB token in \a initial_metadata, or NULL if not used */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 54 | grpc_linked_mdelem* lb_token_mdelem_storage; |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 55 | } grpc_lb_policy_pick_args; |
| 56 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 57 | struct grpc_lb_policy_vtable { |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 58 | void (*destroy)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy); |
| 59 | void (*shutdown_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy); |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 60 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 61 | /** \see grpc_lb_policy_pick */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 62 | int (*pick_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 63 | const grpc_lb_policy_pick_args* pick_args, |
| 64 | grpc_connected_subchannel** target, |
| 65 | grpc_call_context_element* context, void** user_data, |
| 66 | grpc_closure* on_complete); |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 67 | |
| 68 | /** \see grpc_lb_policy_cancel_pick */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 69 | void (*cancel_pick_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 70 | grpc_connected_subchannel** target, |
| 71 | grpc_error* error); |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 72 | |
| 73 | /** \see grpc_lb_policy_cancel_picks */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 74 | void (*cancel_picks_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 75 | uint32_t initial_metadata_flags_mask, |
| 76 | uint32_t initial_metadata_flags_eq, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 77 | grpc_error* error); |
Craig Tiller | c7b5f76 | 2015-06-27 11:48:42 -0700 | [diff] [blame] | 78 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 79 | /** \see grpc_lb_policy_ping_one */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 80 | void (*ping_one_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 81 | grpc_closure* closure); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 82 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 83 | /** Try to enter a READY connectivity state */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 84 | void (*exit_idle_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 85 | |
Craig Tiller | c7b5f76 | 2015-06-27 11:48:42 -0700 | [diff] [blame] | 86 | /** check the current connectivity of the lb_policy */ |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 87 | grpc_connectivity_state (*check_connectivity_locked)( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 88 | grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 89 | grpc_error** connectivity_error); |
Craig Tiller | c7b5f76 | 2015-06-27 11:48:42 -0700 | [diff] [blame] | 90 | |
| 91 | /** call notify when the connectivity state of a channel changes from *state. |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 92 | Updates *state with the new state of the policy. Calling with a NULL \a |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 93 | state cancels the subscription. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 94 | void (*notify_on_state_change_locked)(grpc_exec_ctx* exec_ctx, |
| 95 | grpc_lb_policy* policy, |
| 96 | grpc_connectivity_state* state, |
| 97 | grpc_closure* closure); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 98 | |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 99 | void (*update_locked)(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 100 | const grpc_lb_policy_args* args); |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 101 | |
| 102 | /** \see grpc_lb_policy_set_reresolve_closure */ |
| 103 | void (*set_reresolve_closure_locked)(grpc_exec_ctx* exec_ctx, |
| 104 | grpc_lb_policy* policy, |
| 105 | grpc_closure* request_reresolution); |
Craig Tiller | 9d0e047 | 2015-06-23 09:12:48 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
ncteisen | 9c43fc0 | 2017-06-08 16:06:23 -0700 | [diff] [blame] | 108 | #ifndef NDEBUG |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 109 | |
| 110 | /* Strong references: the policy will shutdown when they reach zero */ |
Craig Tiller | 4ab82d2 | 2015-06-29 09:40:33 -0700 | [diff] [blame] | 111 | #define GRPC_LB_POLICY_REF(p, r) \ |
| 112 | grpc_lb_policy_ref((p), __FILE__, __LINE__, (r)) |
Craig Tiller | 8af4c33 | 2015-09-22 12:32:31 -0700 | [diff] [blame] | 113 | #define GRPC_LB_POLICY_UNREF(exec_ctx, p, r) \ |
| 114 | grpc_lb_policy_unref((exec_ctx), (p), __FILE__, __LINE__, (r)) |
David Garcia Quintas | e224a76 | 2016-11-01 13:00:58 -0700 | [diff] [blame] | 115 | |
| 116 | /* Weak references: they don't prevent the shutdown of the LB policy. When no |
| 117 | * strong references are left but there are still weak ones, shutdown is called. |
| 118 | * Once the weak reference also reaches zero, the LB policy is destroyed. */ |
Craig Tiller | 4861304 | 2015-11-29 14:45:11 -0800 | [diff] [blame] | 119 | #define GRPC_LB_POLICY_WEAK_REF(p, r) \ |
| 120 | grpc_lb_policy_weak_ref((p), __FILE__, __LINE__, (r)) |
| 121 | #define GRPC_LB_POLICY_WEAK_UNREF(exec_ctx, p, r) \ |
| 122 | grpc_lb_policy_weak_unref((exec_ctx), (p), __FILE__, __LINE__, (r)) |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 123 | void grpc_lb_policy_ref(grpc_lb_policy* policy, const char* file, int line, |
| 124 | const char* reason); |
| 125 | void grpc_lb_policy_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 126 | const char* file, int line, const char* reason); |
| 127 | void grpc_lb_policy_weak_ref(grpc_lb_policy* policy, const char* file, int line, |
| 128 | const char* reason); |
| 129 | void grpc_lb_policy_weak_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 130 | const char* file, int line, const char* reason); |
Craig Tiller | d7b68e7 | 2015-06-28 11:41:09 -0700 | [diff] [blame] | 131 | #else |
| 132 | #define GRPC_LB_POLICY_REF(p, r) grpc_lb_policy_ref((p)) |
Craig Tiller | 8af4c33 | 2015-09-22 12:32:31 -0700 | [diff] [blame] | 133 | #define GRPC_LB_POLICY_UNREF(cl, p, r) grpc_lb_policy_unref((cl), (p)) |
Craig Tiller | 4861304 | 2015-11-29 14:45:11 -0800 | [diff] [blame] | 134 | #define GRPC_LB_POLICY_WEAK_REF(p, r) grpc_lb_policy_weak_ref((p)) |
| 135 | #define GRPC_LB_POLICY_WEAK_UNREF(cl, p, r) grpc_lb_policy_weak_unref((cl), (p)) |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 136 | void grpc_lb_policy_ref(grpc_lb_policy* policy); |
| 137 | void grpc_lb_policy_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy); |
| 138 | void grpc_lb_policy_weak_ref(grpc_lb_policy* policy); |
| 139 | void grpc_lb_policy_weak_unref(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy); |
Craig Tiller | d7b68e7 | 2015-06-28 11:41:09 -0700 | [diff] [blame] | 140 | #endif |
| 141 | |
| 142 | /** called by concrete implementations to initialize the base struct */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 143 | void grpc_lb_policy_init(grpc_lb_policy* policy, |
| 144 | const grpc_lb_policy_vtable* vtable, |
| 145 | grpc_combiner* combiner); |
Craig Tiller | f5f1712 | 2015-06-25 08:47:26 -0700 | [diff] [blame] | 146 | |
Mark D. Roth | 1e5f6af | 2016-10-07 08:32:58 -0700 | [diff] [blame] | 147 | /** Finds an appropriate subchannel for a call, based on \a pick_args. |
| 148 | |
Mark D. Roth | d7389b4 | 2017-05-17 12:22:17 -0700 | [diff] [blame] | 149 | \a target will be set to the selected subchannel, or NULL on failure |
| 150 | or when the LB policy decides to drop the call. |
| 151 | |
Mark D. Roth | 1e5f6af | 2016-10-07 08:32:58 -0700 | [diff] [blame] | 152 | Upon success, \a user_data will be set to whatever opaque information |
| 153 | may need to be propagated from the LB policy, or NULL if not needed. |
Mark D. Roth | 09e458c | 2017-05-02 08:13:26 -0700 | [diff] [blame] | 154 | \a context will be populated with context to pass to the subchannel |
| 155 | call, if needed. |
Mark D. Roth | 1e5f6af | 2016-10-07 08:32:58 -0700 | [diff] [blame] | 156 | |
| 157 | If the pick succeeds and a result is known immediately, a non-zero |
| 158 | value will be returned. Otherwise, \a on_complete will be invoked |
| 159 | once the pick is complete with its error argument set to indicate |
| 160 | success or failure. |
| 161 | |
Yuchen Zeng | 3efcb48 | 2016-10-10 15:28:50 -0700 | [diff] [blame] | 162 | Any IO should be done under the \a interested_parties \a grpc_pollset_set |
| 163 | in the \a grpc_lb_policy struct. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 164 | int grpc_lb_policy_pick_locked(grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 165 | const grpc_lb_policy_pick_args* pick_args, |
| 166 | grpc_connected_subchannel** target, |
| 167 | grpc_call_context_element* context, |
| 168 | void** user_data, grpc_closure* on_complete); |
Craig Tiller | 577c9b2 | 2015-11-02 14:11:15 -0800 | [diff] [blame] | 169 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 170 | /** Perform a connected subchannel ping (see \a grpc_connected_subchannel_ping) |
| 171 | against one of the connected subchannels managed by \a policy. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 172 | void grpc_lb_policy_ping_one_locked(grpc_exec_ctx* exec_ctx, |
| 173 | grpc_lb_policy* policy, |
| 174 | grpc_closure* closure); |
Craig Tiller | 26dab31 | 2015-12-07 14:43:47 -0800 | [diff] [blame] | 175 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 176 | /** Cancel picks for \a target. |
| 177 | The \a on_complete callback of the pending picks will be invoked with \a |
| 178 | *target set to NULL. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 179 | void grpc_lb_policy_cancel_pick_locked(grpc_exec_ctx* exec_ctx, |
| 180 | grpc_lb_policy* policy, |
| 181 | grpc_connected_subchannel** target, |
| 182 | grpc_error* error); |
Craig Tiller | ca3e9d3 | 2015-06-27 18:37:27 -0700 | [diff] [blame] | 183 | |
David Garcia Quintas | 8aace51 | 2016-08-15 14:55:12 -0700 | [diff] [blame] | 184 | /** Cancel all pending picks for which their \a initial_metadata_flags (as given |
| 185 | in the call to \a grpc_lb_policy_pick) matches \a initial_metadata_flags_eq |
| 186 | when AND'd with \a initial_metadata_flags_mask */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 187 | void grpc_lb_policy_cancel_picks_locked(grpc_exec_ctx* exec_ctx, |
| 188 | grpc_lb_policy* policy, |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 189 | uint32_t initial_metadata_flags_mask, |
| 190 | uint32_t initial_metadata_flags_eq, |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 191 | grpc_error* error); |
Craig Tiller | 8c0d96f | 2016-03-11 14:27:52 -0800 | [diff] [blame] | 192 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 193 | /** Try to enter a READY connectivity state */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 194 | void grpc_lb_policy_exit_idle_locked(grpc_exec_ctx* exec_ctx, |
| 195 | grpc_lb_policy* policy); |
Craig Tiller | 48cb07c | 2015-07-15 16:16:15 -0700 | [diff] [blame] | 196 | |
David Garcia Quintas | 3fb8f73 | 2016-06-15 22:53:08 -0700 | [diff] [blame] | 197 | /* Call notify when the connectivity state of a channel changes from \a *state. |
| 198 | * Updates \a *state with the new state of the policy */ |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 199 | void grpc_lb_policy_notify_on_state_change_locked( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 200 | grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 201 | grpc_connectivity_state* state, grpc_closure* closure); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 202 | |
Craig Tiller | 2400bf5 | 2017-02-09 16:25:19 -0800 | [diff] [blame] | 203 | grpc_connectivity_state grpc_lb_policy_check_connectivity_locked( |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 204 | grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 205 | grpc_error** connectivity_error); |
Craig Tiller | 1ada6ad | 2015-07-16 16:19:14 -0700 | [diff] [blame] | 206 | |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 207 | /** Update \a policy with \a lb_policy_args. */ |
Craig Tiller | baa14a9 | 2017-11-03 09:09:36 -0700 | [diff] [blame] | 208 | void grpc_lb_policy_update_locked(grpc_exec_ctx* exec_ctx, |
| 209 | grpc_lb_policy* policy, |
| 210 | const grpc_lb_policy_args* lb_policy_args); |
David Garcia Quintas | 87d5a31 | 2017-06-06 19:45:58 -0700 | [diff] [blame] | 211 | |
Juanli Shen | 592cf34 | 2017-12-04 20:52:01 -0800 | [diff] [blame] | 212 | /** Set the re-resolution closure to \a request_reresolution. */ |
| 213 | void grpc_lb_policy_set_reresolve_closure_locked( |
| 214 | grpc_exec_ctx* exec_ctx, grpc_lb_policy* policy, |
| 215 | grpc_closure* request_reresolution); |
| 216 | |
| 217 | /** Try to request a re-resolution. It's NOT a public API; it's only for use by |
| 218 | the LB policy implementations. */ |
| 219 | void grpc_lb_policy_try_reresolve(grpc_exec_ctx* exec_ctx, |
| 220 | grpc_lb_policy* policy, |
| 221 | grpc_core::TraceFlag* grpc_lb_trace, |
| 222 | grpc_error* error); |
| 223 | |
Craig Tiller | d608cd6 | 2017-04-02 16:23:17 -0700 | [diff] [blame] | 224 | #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_H */ |