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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/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_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory) {}
static grpc_subchannel* client_channel_factory_create_subchannel(
grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
const grpc_subchannel_args* args) {
grpc_connector* connector = grpc_chttp2_connector_create();
grpc_subchannel* s = grpc_subchannel_create(exec_ctx, connector, args);
grpc_connector_unref(exec_ctx, connector);
return s;
}
static grpc_channel* client_channel_factory_create_channel(
grpc_exec_ctx* exec_ctx, grpc_client_channel_factory* cc_factory,
const char* target, grpc_client_channel_type type,
const grpc_channel_args* args) {
if (target == NULL) {
gpr_log(GPR_ERROR, "cannot create channel with NULL target name");
return NULL;
}
// Add channel arg containing the server URI.
grpc_arg arg = grpc_channel_arg_string_create(
(char*)GRPC_ARG_SERVER_URI,
grpc_resolver_factory_add_default_prefix_if_needed(exec_ctx, target));
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);
gpr_free(arg.value.string);
grpc_channel* channel = grpc_channel_create(exec_ctx, target, new_args,
GRPC_CLIENT_CHANNEL, NULL);
grpc_channel_args_destroy(exec_ctx, 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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE(
"grpc_insecure_channel_create(target=%s, args=%p, reserved=%p)", 3,
(target, args, reserved));
GPR_ASSERT(reserved == NULL);
// 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(
&exec_ctx, &client_channel_factory, target,
GRPC_CLIENT_CHANNEL_TYPE_REGULAR, new_args);
// Clean up.
grpc_channel_args_destroy(&exec_ctx, new_args);
grpc_exec_ctx_finish(&exec_ctx);
return channel != NULL ? channel
: grpc_lame_client_channel_create(
target, GRPC_STATUS_INTERNAL,
"Failed to create client channel");
}
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