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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++/channel.h>
#include <memory>
#include <grpc++/client_context.h>
#include <grpc++/completion_queue.h>
#include <grpc++/impl/call.h>
#include <grpc++/impl/codegen/completion_queue_tag.h>
#include <grpc++/impl/grpc_library.h>
#include <grpc++/impl/rpc_method.h>
#include <grpc++/security/credentials.h>
#include <grpc++/support/channel_arguments.h>
#include <grpc++/support/config.h>
#include <grpc++/support/status.h>
#include <grpc++/support/time.h>
#include <grpc/grpc.h>
#include <grpc/slice.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/profiling/timers.h"
namespace grpc {
static internal::GrpcLibraryInitializer g_gli_initializer;
Channel::Channel(const grpc::string& host, grpc_channel* channel)
: host_(host), c_channel_(channel) {
g_gli_initializer.summon();
}
Channel::~Channel() { grpc_channel_destroy(c_channel_); }
namespace {
grpc::string GetChannelInfoField(grpc_channel* channel,
grpc_channel_info* channel_info,
char*** channel_info_field) {
char* value = NULL;
memset(channel_info, 0, sizeof(*channel_info));
*channel_info_field = &value;
grpc_channel_get_info(channel, channel_info);
if (value == NULL) return "";
grpc::string result = value;
gpr_free(value);
return result;
}
} // namespace
grpc::string Channel::GetLoadBalancingPolicyName() const {
grpc_channel_info channel_info;
return GetChannelInfoField(c_channel_, &channel_info,
&channel_info.lb_policy_name);
}
grpc::string Channel::GetServiceConfigJSON() const {
grpc_channel_info channel_info;
return GetChannelInfoField(c_channel_, &channel_info,
&channel_info.service_config_json);
}
Call Channel::CreateCall(const RpcMethod& method, ClientContext* context,
CompletionQueue* cq) {
const bool kRegistered = method.channel_tag() && context->authority().empty();
grpc_call* c_call = NULL;
if (kRegistered) {
c_call = grpc_channel_create_registered_call(
c_channel_, context->propagate_from_call_,
context->propagation_options_.c_bitmask(), cq->cq(),
method.channel_tag(), context->raw_deadline(), nullptr);
} else {
const char* host_str = NULL;
if (!context->authority().empty()) {
host_str = context->authority_.c_str();
} else if (!host_.empty()) {
host_str = host_.c_str();
}
grpc_slice method_slice = SliceFromCopiedString(method.name());
grpc_slice host_slice;
if (host_str != nullptr) {
host_slice = SliceFromCopiedString(host_str);
}
c_call = grpc_channel_create_call(
c_channel_, context->propagate_from_call_,
context->propagation_options_.c_bitmask(), cq->cq(), method_slice,
host_str == nullptr ? nullptr : &host_slice, context->raw_deadline(),
nullptr);
grpc_slice_unref(method_slice);
if (host_str != nullptr) {
grpc_slice_unref(host_slice);
}
}
grpc_census_call_set_context(c_call, context->census_context());
context->set_call(c_call, shared_from_this());
return Call(c_call, this, cq);
}
void Channel::PerformOpsOnCall(CallOpSetInterface* ops, Call* call) {
static const size_t MAX_OPS = 8;
size_t nops = 0;
grpc_op cops[MAX_OPS];
ops->FillOps(call->call(), cops, &nops);
GPR_ASSERT(GRPC_CALL_OK ==
grpc_call_start_batch(call->call(), cops, nops, ops, nullptr));
}
void* Channel::RegisterMethod(const char* method) {
return grpc_channel_register_call(
c_channel_, method, host_.empty() ? NULL : host_.c_str(), nullptr);
}
grpc_connectivity_state Channel::GetState(bool try_to_connect) {
return grpc_channel_check_connectivity_state(c_channel_, try_to_connect);
}
namespace {
class TagSaver final : public CompletionQueueTag {
public:
explicit TagSaver(void* tag) : tag_(tag) {}
~TagSaver() override {}
bool FinalizeResult(void** tag, bool* status) override {
*tag = tag_;
delete this;
return true;
}
private:
void* tag_;
};
} // namespace
void Channel::NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
gpr_timespec deadline,
CompletionQueue* cq, void* tag) {
TagSaver* tag_saver = new TagSaver(tag);
grpc_channel_watch_connectivity_state(c_channel_, last_observed, deadline,
cq->cq(), tag_saver);
}
bool Channel::WaitForStateChangeImpl(grpc_connectivity_state last_observed,
gpr_timespec deadline) {
CompletionQueue cq;
bool ok = false;
void* tag = NULL;
NotifyOnStateChangeImpl(last_observed, deadline, &cq, NULL);
cq.Next(&tag, &ok);
GPR_ASSERT(tag == NULL);
return ok;
}
} // namespace grpc
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