legacy-libs/grpc/deps/grpc/src/core/ext/transport/chttp2/client/insecure/channel_create.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 <grpc/grpc.h>
  22
  23 #include <string.h>
  24
  25 #include <grpc/support/alloc.h>
  26 #include <grpc/support/string_util.h>
  27
  28 #include "src/core/ext/filters/client_channel/client_channel.h"
  29 #include "src/core/ext/filters/client_channel/resolver_registry.h"
  30 #include "src/core/ext/transport/chttp2/client/authority.h"
  31 #include "src/core/ext/transport/chttp2/client/chttp2_connector.h"
  32 #include "src/core/lib/channel/channel_args.h"
  33 #include "src/core/lib/surface/api_trace.h"
  34 #include "src/core/lib/surface/channel.h"
  35
  36 namespace grpc_core {
  37
  38 class Chttp2InsecureClientChannelFactory : public ClientChannelFactory {
  39  public:
  40   Subchannel* CreateSubchannel(const grpc_channel_args* args) override {
  41     grpc_channel_args* new_args =
  42         grpc_default_authority_add_if_not_present(args);
  43     grpc_connector* connector = grpc_chttp2_connector_create();
  44     Subchannel* s = Subchannel::Create(connector, new_args);
  45     grpc_connector_unref(connector);
  46     grpc_channel_args_destroy(new_args);
  47     return s;
  48   }
  49 };
  50
  51 namespace {
  52
  53 grpc_channel* CreateChannel(const char* target, const grpc_channel_args* args) {
  54   if (target == nullptr) {
  55     gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
  56     return nullptr;
  57   }
  58   // Add channel arg containing the server URI.
  59   UniquePtr<char> canonical_target =
  60       ResolverRegistry::AddDefaultPrefixIfNeeded(target);
  61   grpc_arg arg = grpc_channel_arg_string_create(
  62       const_cast<char*>(GRPC_ARG_SERVER_URI), canonical_target.get());
  63   const char* to_remove[] = {GRPC_ARG_SERVER_URI};
  64   grpc_channel_args* new_args =
  65       grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
  66   grpc_channel* channel =
  67       grpc_channel_create(target, new_args, GRPC_CLIENT_CHANNEL, nullptr);
  68   grpc_channel_args_destroy(new_args);
  69   return channel;
  70 }
  71
  72 }  // namespace
  73
  74 }  // namespace grpc_core
  75
  76 namespace {
  77
  78 grpc_core::Chttp2InsecureClientChannelFactory* g_factory;
  79 gpr_once g_factory_once = GPR_ONCE_INIT;
  80
  81 void FactoryInit() {
  82   g_factory = grpc_core::New<grpc_core::Chttp2InsecureClientChannelFactory>();
  83 }
  84
  85 }  // namespace
  86
  87 /* Create a client channel:
  88    Asynchronously: - resolve target
  89                    - connect to it (trying alternatives as presented)
  90                    - perform handshakes */
  91 grpc_channel* grpc_insecure_channel_create(const char* target,
  92                                            const grpc_channel_args* args,
  93                                            void* reserved) {
  94   grpc_core::ExecCtx exec_ctx;
  95   GRPC_API_TRACE(
  96       "grpc_insecure_channel_create(target=%s, args=%p, reserved=%p)", 3,
  97       (target, args, reserved));
  98   GPR_ASSERT(reserved == nullptr);
  99   // Add channel arg containing the client channel factory.
 100   gpr_once_init(&g_factory_once, FactoryInit);
 101   grpc_arg arg = grpc_core::ClientChannelFactory::CreateChannelArg(g_factory);
 102   grpc_channel_args* new_args = grpc_channel_args_copy_and_add(args, &arg, 1);
 103   // Create channel.
 104   grpc_channel* channel = grpc_core::CreateChannel(target, new_args);
 105   // Clean up.
 106   grpc_channel_args_destroy(new_args);
 107   return channel != nullptr ? channel
 108                             : grpc_lame_client_channel_create(
 109                                   target, GRPC_STATUS_INTERNAL,
 110                                   "Failed to create client channel");
 111 }