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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include <grpc/grpc.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/client_channel/client_channel.h"
#include "src/core/ext/filters/client_channel/resolver_registry.h"
#include "src/core/ext/transport/chttp2/client/chttp2_connector.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/channel.h"
static void client_channel_factory_ref(
grpc_client_channel_factory* cc_factory) {}
static void client_channel_factory_unref(
grpc_client_channel_factory* cc_factory) {}
static grpc_channel_args* add_default_authority_if_not_present(
const grpc_channel_args* args) {
const bool has_default_authority =
grpc_channel_args_find(args, GRPC_ARG_DEFAULT_AUTHORITY) != nullptr;
grpc_arg new_args[1];
size_t num_new_args = 0;
grpc_core::UniquePtr<char> default_authority;
if (!has_default_authority) {
const grpc_arg* server_uri_arg =
grpc_channel_args_find(args, GRPC_ARG_SERVER_URI);
const char* server_uri_str = grpc_channel_arg_get_string(server_uri_arg);
GPR_ASSERT(server_uri_str != nullptr);
default_authority =
grpc_core::ResolverRegistry::GetDefaultAuthority(server_uri_str);
GPR_ASSERT(default_authority != nullptr);
new_args[num_new_args++] = grpc_channel_arg_string_create(
const_cast<char*>(GRPC_ARG_DEFAULT_AUTHORITY), default_authority.get());
}
return grpc_channel_args_copy_and_add(args, new_args, num_new_args);
}
static grpc_subchannel* client_channel_factory_create_subchannel(
grpc_client_channel_factory* cc_factory, const grpc_subchannel_args* args) {
grpc_subchannel_args* final_sc_args =
static_cast<grpc_subchannel_args*>(gpr_malloc(sizeof(*final_sc_args)));
memcpy(final_sc_args, args, sizeof(*args));
final_sc_args->args = add_default_authority_if_not_present(args->args);
grpc_connector* connector = grpc_chttp2_connector_create();
grpc_subchannel* s = grpc_subchannel_create(connector, final_sc_args);
grpc_connector_unref(connector);
grpc_channel_args_destroy(
const_cast<grpc_channel_args*>(final_sc_args->args));
gpr_free(final_sc_args);
return s;
}
static grpc_channel* client_channel_factory_create_channel(
grpc_client_channel_factory* cc_factory, const char* target,
grpc_client_channel_type type, const grpc_channel_args* args) {
if (target == nullptr) {
gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
return nullptr;
}
// Add channel arg containing the server URI.
grpc_core::UniquePtr<char> canonical_target =
grpc_core::ResolverRegistry::AddDefaultPrefixIfNeeded(target);
grpc_arg arg = grpc_channel_arg_string_create(
const_cast<char*>(GRPC_ARG_SERVER_URI), canonical_target.get());
const char* to_remove[] = {GRPC_ARG_SERVER_URI};
grpc_channel_args* new_args =
grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
grpc_channel* channel =
grpc_channel_create(target, new_args, GRPC_CLIENT_CHANNEL, nullptr);
grpc_channel_args_destroy(new_args);
return channel;
}
static const grpc_client_channel_factory_vtable client_channel_factory_vtable =
{client_channel_factory_ref, client_channel_factory_unref,
client_channel_factory_create_subchannel,
client_channel_factory_create_channel};
static grpc_client_channel_factory client_channel_factory = {
&client_channel_factory_vtable};
/* Create a client channel:
Asynchronously: - resolve target
- connect to it (trying alternatives as presented)
- perform handshakes */
grpc_channel* grpc_insecure_channel_create(const char* target,
const grpc_channel_args* args,
void* reserved) {
grpc_core::ExecCtx exec_ctx;
GRPC_API_TRACE(
"grpc_insecure_channel_create(target=%s, args=%p, reserved=%p)", 3,
(target, args, reserved));
GPR_ASSERT(reserved == nullptr);
// Add channel arg containing the client channel factory.
grpc_arg arg =
grpc_client_channel_factory_create_channel_arg(&client_channel_factory);
grpc_channel_args* new_args = grpc_channel_args_copy_and_add(args, &arg, 1);
// Create channel.
grpc_channel* channel = client_channel_factory_create_channel(
&client_channel_factory, target, GRPC_CLIENT_CHANNEL_TYPE_REGULAR,
new_args);
// Clean up.
grpc_channel_args_destroy(new_args);
return channel != nullptr ? channel
: grpc_lame_client_channel_create(
target, GRPC_STATUS_INTERNAL,
"Failed to create client channel");
}
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