src/core/ext/filters/client_channel/client_channel_factory.cc

   1 /*
   2  *
   3  * Copyright 2015 gRPC authors.
   4  *
   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
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  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.
  16  *
  17  */
  18
  19 #include <grpc/support/port_platform.h>
  20
  21 #include "src/core/ext/filters/client_channel/client_channel_factory.h"
  22 #include "src/core/lib/channel/channel_args.h"
  23
  24 // Channel arg key for client channel factory.
  25 #define GRPC_ARG_CLIENT_CHANNEL_FACTORY "grpc.client_channel_factory"
  26
  27 namespace grpc_core {
  28
  29 namespace {
  30
  31 void* factory_arg_copy(void* f) { return f; }
  32 void factory_arg_destroy(void* /*f*/) {}
  33 int factory_arg_cmp(void* factory1, void* factory2) {
  34   return GPR_ICMP(factory1, factory2);
  35 }
  36 const grpc_arg_pointer_vtable factory_arg_vtable = {
  37     factory_arg_copy, factory_arg_destroy, factory_arg_cmp};
  38
  39 }  // namespace
  40
  41 grpc_arg ClientChannelFactory::CreateChannelArg(ClientChannelFactory* factory) {
  42   return grpc_channel_arg_pointer_create(
  43       const_cast<char*>(GRPC_ARG_CLIENT_CHANNEL_FACTORY), factory,
  44       &factory_arg_vtable);
  45 }
  46
  47 ClientChannelFactory* ClientChannelFactory::GetFromChannelArgs(
  48     const grpc_channel_args* args) {
  49   const grpc_arg* arg =
  50       grpc_channel_args_find(args, GRPC_ARG_CLIENT_CHANNEL_FACTORY);
  51   if (arg == nullptr || arg->type != GRPC_ARG_POINTER) return nullptr;
  52   return static_cast<ClientChannelFactory*>(arg->value.pointer.p);
  53 }
  54
  55 }  // namespace grpc_core