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   RefCountedPtr<Subchannel> CreateSubchannel(
  41       const grpc_channel_args* args) override {
  42     grpc_channel_args* new_args =
  43         grpc_default_authority_add_if_not_present(args);
  44     RefCountedPtr<Subchannel> s =
  45         Subchannel::Create(MakeOrphanable<Chttp2Connector>(), new_args);
  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                             grpc_error_handle* error) {
  55   if (target == nullptr) {
  56     gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
  57     if (error != nullptr) {
  58       *error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("channel target is NULL");
  59     }
  60     return nullptr;
  61   }
  62   // Add channel arg containing the server URI.
  63   grpc_core::UniquePtr<char> canonical_target =
  64       ResolverRegistry::AddDefaultPrefixIfNeeded(target);
  65   grpc_arg arg = grpc_channel_arg_string_create(
  66       const_cast<char*>(GRPC_ARG_SERVER_URI), canonical_target.get());
  67   const char* to_remove[] = {GRPC_ARG_SERVER_URI};
  68   grpc_channel_args* new_args =
  69       grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
  70   grpc_channel* channel = grpc_channel_create(
  71       target, new_args, GRPC_CLIENT_CHANNEL, nullptr, nullptr, error);
  72   grpc_channel_args_destroy(new_args);
  73   return channel;
  74 }
  75
  76 }  // namespace
  77
  78 }  // namespace grpc_core
  79
  80 namespace {
  81
  82 grpc_core::Chttp2InsecureClientChannelFactory* g_factory;
  83 gpr_once g_factory_once = GPR_ONCE_INIT;
  84
  85 void FactoryInit() {
  86   g_factory = new grpc_core::Chttp2InsecureClientChannelFactory();
  87 }
  88
  89 }  // namespace
  90
  91 /* Create a client channel:
  92    Asynchronously: - resolve target
  93                    - connect to it (trying alternatives as presented)
  94                    - perform handshakes */
  95 grpc_channel* grpc_insecure_channel_create(const char* target,
  96                                            const grpc_channel_args* args,
  97                                            void* reserved) {
  98   grpc_core::ExecCtx exec_ctx;
  99   GRPC_API_TRACE(
 100       "grpc_insecure_channel_create(target=%s, args=%p, reserved=%p)", 3,
 101       (target, args, reserved));
 102   GPR_ASSERT(reserved == nullptr);
 103   // Add channel arg containing the client channel factory.
 104   gpr_once_init(&g_factory_once, FactoryInit);
 105   grpc_arg arg = grpc_core::ClientChannelFactory::CreateChannelArg(g_factory);
 106   const char* arg_to_remove = arg.key;
 107   grpc_channel_args* new_args = grpc_channel_args_copy_and_add_and_remove(
 108       args, &arg_to_remove, 1, &arg, 1);
 109   grpc_error_handle error = GRPC_ERROR_NONE;
 110   // Create channel.
 111   grpc_channel* channel = grpc_core::CreateChannel(target, new_args, &error);
 112   // Clean up.
 113   grpc_channel_args_destroy(new_args);
 114   if (channel == nullptr) {
 115     intptr_t integer;
 116     grpc_status_code status = GRPC_STATUS_INTERNAL;
 117     if (grpc_error_get_int(error, GRPC_ERROR_INT_GRPC_STATUS, &integer)) {
 118       status = static_cast<grpc_status_code>(integer);
 119     }
 120     GRPC_ERROR_UNREF(error);
 121     channel = grpc_lame_client_channel_create(
 122         target, status, "Failed to create client channel");
 123   }
 124   return channel;
 125 }