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/*
*
* 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/stream/stream_context.h"
#include <grpc/support/log.h>
#include "src/cpp/proto/proto_utils.h"
#include "src/cpp/util/time.h"
#include <grpc++/client_context.h>
#include <grpc++/config.h>
#include <grpc++/impl/rpc_method.h>
#include <google/protobuf/message.h>
namespace grpc {
// Client only ctor
StreamContext::StreamContext(const RpcMethod& method, ClientContext* context,
const google::protobuf::Message* request,
google::protobuf::Message* result)
: is_client_(true),
method_(&method),
call_(context->call()),
cq_(context->cq()),
request_(const_cast<google::protobuf::Message*>(request)),
result_(result),
peer_halfclosed_(false),
self_halfclosed_(false) {
GPR_ASSERT(method_->method_type() != RpcMethod::RpcType::NORMAL_RPC);
}
// Server only ctor
StreamContext::StreamContext(const RpcMethod& method, grpc_call* call,
grpc_completion_queue* cq,
google::protobuf::Message* request,
google::protobuf::Message* result)
: is_client_(false),
method_(&method),
call_(call),
cq_(cq),
request_(request),
result_(result),
peer_halfclosed_(false),
self_halfclosed_(false) {
GPR_ASSERT(method_->method_type() != RpcMethod::RpcType::NORMAL_RPC);
}
StreamContext::~StreamContext() {}
void StreamContext::Start(bool buffered) {
if (is_client_) {
// TODO(yangg) handle metadata send path
int flag = buffered ? GRPC_WRITE_BUFFER_HINT : 0;
grpc_call_error error = grpc_call_start_invoke(call(), cq(), invoke_tag(),
client_metadata_read_tag(),
finished_tag(), flag);
GPR_ASSERT(GRPC_CALL_OK == error);
grpc_event* invoke_ev =
grpc_completion_queue_pluck(cq(), invoke_tag(), gpr_inf_future);
if (invoke_ev->data.invoke_accepted != GRPC_OP_OK) {
peer_halfclosed_ = true;
self_halfclosed_ = true;
}
grpc_event_finish(invoke_ev);
} else {
// TODO(yangg) metadata needs to be added before accept
// TODO(yangg) correctly set flag to accept
GPR_ASSERT(grpc_call_server_accept(call(), cq(), finished_tag()) ==
GRPC_CALL_OK);
GPR_ASSERT(grpc_call_server_end_initial_metadata(call(), 0) ==
GRPC_CALL_OK);
}
}
bool StreamContext::Read(google::protobuf::Message* msg) {
// TODO(yangg) check peer_halfclosed_ here for possible early return.
grpc_call_error err = grpc_call_start_read(call(), read_tag());
GPR_ASSERT(err == GRPC_CALL_OK);
grpc_event* read_ev =
grpc_completion_queue_pluck(cq(), read_tag(), gpr_inf_future);
GPR_ASSERT(read_ev->type == GRPC_READ);
bool ret = true;
if (read_ev->data.read) {
if (!DeserializeProto(read_ev->data.read, msg)) {
ret = false;
FinishStream(
Status(StatusCode::DATA_LOSS, "Failed to parse incoming proto"),
true);
}
} else {
ret = false;
peer_halfclosed_ = true;
}
grpc_event_finish(read_ev);
return ret;
}
bool StreamContext::Write(const google::protobuf::Message* msg, bool is_last) {
// TODO(yangg) check self_halfclosed_ for possible early return.
bool ret = true;
grpc_event* ev = nullptr;
if (msg) {
grpc_byte_buffer* out_buf = nullptr;
if (!SerializeProto(*msg, &out_buf)) {
FinishStream(Status(StatusCode::INVALID_ARGUMENT,
"Failed to serialize outgoing proto"),
true);
return false;
}
int flag = is_last ? GRPC_WRITE_BUFFER_HINT : 0;
grpc_call_error err =
grpc_call_start_write(call(), out_buf, write_tag(), flag);
grpc_byte_buffer_destroy(out_buf);
GPR_ASSERT(err == GRPC_CALL_OK);
ev = grpc_completion_queue_pluck(cq(), write_tag(), gpr_inf_future);
GPR_ASSERT(ev->type == GRPC_WRITE_ACCEPTED);
ret = ev->data.write_accepted == GRPC_OP_OK;
grpc_event_finish(ev);
}
if (ret && is_last) {
grpc_call_error err = grpc_call_writes_done(call(), halfclose_tag());
GPR_ASSERT(err == GRPC_CALL_OK);
ev = grpc_completion_queue_pluck(cq(), halfclose_tag(), gpr_inf_future);
GPR_ASSERT(ev->type == GRPC_FINISH_ACCEPTED);
grpc_event_finish(ev);
self_halfclosed_ = true;
} else if (!ret) { // Stream broken
self_halfclosed_ = true;
peer_halfclosed_ = true;
}
return ret;
}
const Status& StreamContext::Wait() {
// TODO(yangg) properly support metadata
grpc_event* metadata_ev = grpc_completion_queue_pluck(
cq(), client_metadata_read_tag(), gpr_inf_future);
grpc_event_finish(metadata_ev);
// TODO(yangg) protect states by a mutex, including other places.
if (!self_halfclosed_ || !peer_halfclosed_) {
FinishStream(Status::Cancelled, true);
} else {
grpc_event* finish_ev =
grpc_completion_queue_pluck(cq(), finished_tag(), gpr_inf_future);
GPR_ASSERT(finish_ev->type == GRPC_FINISHED);
final_status_ = Status(
static_cast<StatusCode>(finish_ev->data.finished.status),
finish_ev->data.finished.details ? finish_ev->data.finished.details
: "");
grpc_event_finish(finish_ev);
}
return final_status_;
}
void StreamContext::FinishStream(const Status& status, bool send) {
if (send) {
grpc_call_cancel(call());
}
grpc_event* finish_ev =
grpc_completion_queue_pluck(cq(), finished_tag(), gpr_inf_future);
GPR_ASSERT(finish_ev->type == GRPC_FINISHED);
grpc_event_finish(finish_ev);
final_status_ = status;
}
} // namespace grpc
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