| /* |
| * |
| * Copyright 2014, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "src/cpp/client/channel.h" |
| |
| #include <chrono> |
| #include <memory> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/grpc_security.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/slice.h> |
| |
| #include "src/cpp/proto/proto_utils.h" |
| #include "src/cpp/stream/stream_context.h" |
| #include <grpc++/channel_arguments.h> |
| #include <grpc++/client_context.h> |
| #include <grpc++/config.h> |
| #include <grpc++/credentials.h> |
| #include <grpc++/impl/rpc_method.h> |
| #include <grpc++/status.h> |
| #include <google/protobuf/message.h> |
| |
| namespace grpc { |
| |
| Channel::Channel(const grpc::string& target, const ChannelArguments& args) |
| : target_(target) { |
| grpc_channel_args channel_args; |
| args.SetChannelArgs(&channel_args); |
| c_channel_ = grpc_channel_create( |
| target_.c_str(), channel_args.num_args > 0 ? &channel_args : nullptr); |
| } |
| |
| Channel::Channel(const grpc::string& target, |
| const std::unique_ptr<Credentials>& creds, |
| const ChannelArguments& args) |
| : target_(args.GetSslTargetNameOverride().empty() |
| ? target |
| : args.GetSslTargetNameOverride()) { |
| grpc_channel_args channel_args; |
| args.SetChannelArgs(&channel_args); |
| grpc_credentials* c_creds = creds ? creds->GetRawCreds() : nullptr; |
| c_channel_ = grpc_secure_channel_create( |
| c_creds, target.c_str(), |
| channel_args.num_args > 0 ? &channel_args : nullptr); |
| } |
| |
| Channel::~Channel() { grpc_channel_destroy(c_channel_); } |
| |
| namespace { |
| // Pluck the finished event and set to status when it is not nullptr. |
| void GetFinalStatus(grpc_completion_queue* cq, void* finished_tag, |
| Status* status) { |
| grpc_event* ev = |
| grpc_completion_queue_pluck(cq, finished_tag, gpr_inf_future); |
| if (status) { |
| StatusCode error_code = static_cast<StatusCode>(ev->data.finished.status); |
| grpc::string details(ev->data.finished.details ? ev->data.finished.details |
| : ""); |
| *status = Status(error_code, details); |
| } |
| grpc_event_finish(ev); |
| } |
| } // namespace |
| |
| // TODO(yangg) more error handling |
| Status Channel::StartBlockingRpc(const RpcMethod& method, |
| ClientContext* context, |
| const google::protobuf::Message& request, |
| google::protobuf::Message* result) { |
| Status status; |
| grpc_call* call = grpc_channel_create_call( |
| c_channel_, method.name(), target_.c_str(), context->RawDeadline()); |
| context->set_call(call); |
| grpc_event* ev; |
| void* finished_tag = reinterpret_cast<char*>(call); |
| void* invoke_tag = reinterpret_cast<char*>(call) + 1; |
| void* metadata_read_tag = reinterpret_cast<char*>(call) + 2; |
| void* write_tag = reinterpret_cast<char*>(call) + 3; |
| void* halfclose_tag = reinterpret_cast<char*>(call) + 4; |
| void* read_tag = reinterpret_cast<char*>(call) + 5; |
| |
| grpc_completion_queue* cq = grpc_completion_queue_create(); |
| context->set_cq(cq); |
| // add_metadata from context |
| // |
| // invoke |
| GPR_ASSERT(grpc_call_start_invoke(call, cq, invoke_tag, metadata_read_tag, |
| finished_tag, |
| GRPC_WRITE_BUFFER_HINT) == GRPC_CALL_OK); |
| ev = grpc_completion_queue_pluck(cq, invoke_tag, gpr_inf_future); |
| bool success = ev->data.invoke_accepted == GRPC_OP_OK; |
| grpc_event_finish(ev); |
| if (!success) { |
| GetFinalStatus(cq, finished_tag, &status); |
| return status; |
| } |
| // write request |
| grpc_byte_buffer* write_buffer = nullptr; |
| success = SerializeProto(request, &write_buffer); |
| if (!success) { |
| grpc_call_cancel(call); |
| status = |
| Status(StatusCode::DATA_LOSS, "Failed to serialize request proto."); |
| GetFinalStatus(cq, finished_tag, nullptr); |
| return status; |
| } |
| GPR_ASSERT(grpc_call_start_write(call, write_buffer, write_tag, |
| GRPC_WRITE_BUFFER_HINT) == GRPC_CALL_OK); |
| grpc_byte_buffer_destroy(write_buffer); |
| ev = grpc_completion_queue_pluck(cq, write_tag, gpr_inf_future); |
| |
| success = ev->data.write_accepted == GRPC_OP_OK; |
| grpc_event_finish(ev); |
| if (!success) { |
| GetFinalStatus(cq, finished_tag, &status); |
| return status; |
| } |
| // writes done |
| GPR_ASSERT(grpc_call_writes_done(call, halfclose_tag) == GRPC_CALL_OK); |
| ev = grpc_completion_queue_pluck(cq, halfclose_tag, gpr_inf_future); |
| grpc_event_finish(ev); |
| // start read metadata |
| // |
| ev = grpc_completion_queue_pluck(cq, metadata_read_tag, gpr_inf_future); |
| grpc_event_finish(ev); |
| // start read |
| GPR_ASSERT(grpc_call_start_read(call, read_tag) == GRPC_CALL_OK); |
| ev = grpc_completion_queue_pluck(cq, read_tag, gpr_inf_future); |
| if (ev->data.read) { |
| if (!DeserializeProto(ev->data.read, result)) { |
| grpc_event_finish(ev); |
| status = Status(StatusCode::DATA_LOSS, "Failed to parse response proto."); |
| GetFinalStatus(cq, finished_tag, nullptr); |
| return status; |
| } |
| } |
| grpc_event_finish(ev); |
| |
| // wait status |
| GetFinalStatus(cq, finished_tag, &status); |
| return status; |
| } |
| |
| StreamContextInterface* Channel::CreateStream( |
| const RpcMethod& method, ClientContext* context, |
| const google::protobuf::Message* request, |
| google::protobuf::Message* result) { |
| grpc_call* call = grpc_channel_create_call( |
| c_channel_, method.name(), target_.c_str(), context->RawDeadline()); |
| context->set_call(call); |
| grpc_completion_queue* cq = grpc_completion_queue_create(); |
| context->set_cq(cq); |
| return new StreamContext(method, context, request, result); |
| } |
| |
| } // namespace grpc |