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/*
*
* Copyright 2016 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 "test/cpp/end2end/test_service_impl.h"
#include <string>
#include <thread>
#include <grpc/support/log.h>
#include <grpcpp/security/credentials.h>
#include <grpcpp/server_context.h>
#include "src/proto/grpc/testing/echo.grpc.pb.h"
#include "test/cpp/util/string_ref_helper.h"
#include <gtest/gtest.h>
using std::chrono::system_clock;
namespace grpc {
namespace testing {
namespace {
// When echo_deadline is requested, deadline seen in the ServerContext is set in
// the response in seconds.
void MaybeEchoDeadline(ServerContext* context, const EchoRequest* request,
EchoResponse* response) {
if (request->has_param() && request->param().echo_deadline()) {
gpr_timespec deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
if (context->deadline() != system_clock::time_point::max()) {
Timepoint2Timespec(context->deadline(), &deadline);
}
response->mutable_param()->set_request_deadline(deadline.tv_sec);
}
}
void CheckServerAuthContext(
const ServerContext* context,
const grpc::string& expected_transport_security_type,
const grpc::string& expected_client_identity) {
std::shared_ptr<const AuthContext> auth_ctx = context->auth_context();
std::vector<grpc::string_ref> tst =
auth_ctx->FindPropertyValues("transport_security_type");
EXPECT_EQ(1u, tst.size());
EXPECT_EQ(expected_transport_security_type, ToString(tst[0]));
if (expected_client_identity.empty()) {
EXPECT_TRUE(auth_ctx->GetPeerIdentityPropertyName().empty());
EXPECT_TRUE(auth_ctx->GetPeerIdentity().empty());
EXPECT_FALSE(auth_ctx->IsPeerAuthenticated());
} else {
auto identity = auth_ctx->GetPeerIdentity();
EXPECT_TRUE(auth_ctx->IsPeerAuthenticated());
EXPECT_EQ(1u, identity.size());
EXPECT_EQ(expected_client_identity, identity[0]);
}
}
// Returns the number of pairs in metadata that exactly match the given
// key-value pair. Returns -1 if the pair wasn't found.
int MetadataMatchCount(
const std::multimap<grpc::string_ref, grpc::string_ref>& metadata,
const grpc::string& key, const grpc::string& value) {
int count = 0;
for (std::multimap<grpc::string_ref, grpc::string_ref>::const_iterator iter =
metadata.begin();
iter != metadata.end(); ++iter) {
if (ToString(iter->first) == key && ToString(iter->second) == value) {
count++;
}
}
return count;
}
} // namespace
namespace {
int GetIntValueFromMetadataHelper(
const char* key,
const std::multimap<grpc::string_ref, grpc::string_ref>& metadata,
int default_value) {
if (metadata.find(key) != metadata.end()) {
std::istringstream iss(ToString(metadata.find(key)->second));
iss >> default_value;
gpr_log(GPR_INFO, "%s : %d", key, default_value);
}
return default_value;
}
int GetIntValueFromMetadata(
const char* key,
const std::multimap<grpc::string_ref, grpc::string_ref>& metadata,
int default_value) {
return GetIntValueFromMetadataHelper(key, metadata, default_value);
}
void ServerTryCancel(ServerContext* context) {
EXPECT_FALSE(context->IsCancelled());
context->TryCancel();
gpr_log(GPR_INFO, "Server called TryCancel() to cancel the request");
// Now wait until it's really canceled
while (!context->IsCancelled()) {
gpr_sleep_until(gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_micros(1000, GPR_TIMESPAN)));
}
}
void ServerTryCancelNonblocking(ServerContext* context) {
EXPECT_FALSE(context->IsCancelled());
context->TryCancel();
gpr_log(GPR_INFO, "Server called TryCancel() to cancel the request");
}
void LoopUntilCancelled(Alarm* alarm, ServerContext* context,
experimental::ServerCallbackRpcController* controller) {
if (!context->IsCancelled()) {
alarm->experimental().Set(
gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_micros(1000, GPR_TIMESPAN)),
[alarm, context, controller](bool) {
LoopUntilCancelled(alarm, context, controller);
});
} else {
controller->Finish(Status::CANCELLED);
}
}
} // namespace
Status TestServiceImpl::Echo(ServerContext* context, const EchoRequest* request,
EchoResponse* response) {
// A bit of sleep to make sure that short deadline tests fail
if (request->has_param() && request->param().server_sleep_us() > 0) {
gpr_sleep_until(
gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
gpr_time_from_micros(request->param().server_sleep_us(),
GPR_TIMESPAN)));
}
if (request->has_param() && request->param().server_die()) {
gpr_log(GPR_ERROR, "The request should not reach application handler.");
GPR_ASSERT(0);
}
if (request->has_param() && request->param().has_expected_error()) {
const auto& error = request->param().expected_error();
return Status(static_cast<StatusCode>(error.code()), error.error_message(),
error.binary_error_details());
}
int server_try_cancel = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
if (server_try_cancel > DO_NOT_CANCEL) {
// Since this is a unary RPC, by the time this server handler is called,
// the 'request' message is already read from the client. So the scenarios
// in server_try_cancel don't make much sense. Just cancel the RPC as long
// as server_try_cancel is not DO_NOT_CANCEL
ServerTryCancel(context);
return Status::CANCELLED;
}
response->set_message(request->message());
MaybeEchoDeadline(context, request, response);
if (host_) {
response->mutable_param()->set_host(*host_);
}
if (request->has_param() && request->param().client_cancel_after_us()) {
{
std::unique_lock<std::mutex> lock(mu_);
signal_client_ = true;
}
while (!context->IsCancelled()) {
gpr_sleep_until(gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_micros(request->param().client_cancel_after_us(),
GPR_TIMESPAN)));
}
return Status::CANCELLED;
} else if (request->has_param() &&
request->param().server_cancel_after_us()) {
gpr_sleep_until(gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_micros(request->param().server_cancel_after_us(),
GPR_TIMESPAN)));
return Status::CANCELLED;
} else if (!request->has_param() ||
!request->param().skip_cancelled_check()) {
EXPECT_FALSE(context->IsCancelled());
}
if (request->has_param() && request->param().echo_metadata()) {
const std::multimap<grpc::string_ref, grpc::string_ref>& client_metadata =
context->client_metadata();
for (std::multimap<grpc::string_ref, grpc::string_ref>::const_iterator
iter = client_metadata.begin();
iter != client_metadata.end(); ++iter) {
context->AddTrailingMetadata(ToString(iter->first),
ToString(iter->second));
}
// Terminate rpc with error and debug info in trailer.
if (request->param().debug_info().stack_entries_size() ||
!request->param().debug_info().detail().empty()) {
grpc::string serialized_debug_info =
request->param().debug_info().SerializeAsString();
context->AddTrailingMetadata(kDebugInfoTrailerKey, serialized_debug_info);
return Status::CANCELLED;
}
}
if (request->has_param() &&
(request->param().expected_client_identity().length() > 0 ||
request->param().check_auth_context())) {
CheckServerAuthContext(context,
request->param().expected_transport_security_type(),
request->param().expected_client_identity());
}
if (request->has_param() && request->param().response_message_length() > 0) {
response->set_message(
grpc::string(request->param().response_message_length(), '\0'));
}
if (request->has_param() && request->param().echo_peer()) {
response->mutable_param()->set_peer(context->peer());
}
return Status::OK;
}
Status TestServiceImpl::CheckClientInitialMetadata(ServerContext* context,
const SimpleRequest* request,
SimpleResponse* response) {
EXPECT_EQ(MetadataMatchCount(context->client_metadata(),
kCheckClientInitialMetadataKey,
kCheckClientInitialMetadataVal),
1);
EXPECT_EQ(1u,
context->client_metadata().count(kCheckClientInitialMetadataKey));
return Status::OK;
}
void CallbackTestServiceImpl::Echo(
ServerContext* context, const EchoRequest* request, EchoResponse* response,
experimental::ServerCallbackRpcController* controller) {
// A bit of sleep to make sure that short deadline tests fail
if (request->has_param() && request->param().server_sleep_us() > 0) {
// Set an alarm for that much time
alarm_.experimental().Set(
gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
gpr_time_from_micros(request->param().server_sleep_us(),
GPR_TIMESPAN)),
[this, context, request, response, controller](bool) {
EchoNonDelayed(context, request, response, controller);
});
} else {
EchoNonDelayed(context, request, response, controller);
}
}
void CallbackTestServiceImpl::CheckClientInitialMetadata(
ServerContext* context, const SimpleRequest* request,
SimpleResponse* response,
experimental::ServerCallbackRpcController* controller) {
EXPECT_EQ(MetadataMatchCount(context->client_metadata(),
kCheckClientInitialMetadataKey,
kCheckClientInitialMetadataVal),
1);
EXPECT_EQ(1u,
context->client_metadata().count(kCheckClientInitialMetadataKey));
controller->Finish(Status::OK);
}
void CallbackTestServiceImpl::EchoNonDelayed(
ServerContext* context, const EchoRequest* request, EchoResponse* response,
experimental::ServerCallbackRpcController* controller) {
if (request->has_param() && request->param().server_die()) {
gpr_log(GPR_ERROR, "The request should not reach application handler.");
GPR_ASSERT(0);
}
if (request->has_param() && request->param().has_expected_error()) {
const auto& error = request->param().expected_error();
controller->Finish(Status(static_cast<StatusCode>(error.code()),
error.error_message(),
error.binary_error_details()));
return;
}
int server_try_cancel = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
if (server_try_cancel > DO_NOT_CANCEL) {
// Since this is a unary RPC, by the time this server handler is called,
// the 'request' message is already read from the client. So the scenarios
// in server_try_cancel don't make much sense. Just cancel the RPC as long
// as server_try_cancel is not DO_NOT_CANCEL
EXPECT_FALSE(context->IsCancelled());
context->TryCancel();
gpr_log(GPR_INFO, "Server called TryCancel() to cancel the request");
// Now wait until it's really canceled
LoopUntilCancelled(&alarm_, context, controller);
return;
}
gpr_log(GPR_DEBUG, "Request message was %s", request->message().c_str());
response->set_message(request->message());
MaybeEchoDeadline(context, request, response);
if (host_) {
response->mutable_param()->set_host(*host_);
}
if (request->has_param() && request->param().client_cancel_after_us()) {
{
std::unique_lock<std::mutex> lock(mu_);
signal_client_ = true;
}
std::function<void(bool)> recurrence = [this, context, request, controller,
&recurrence](bool) {
if (!context->IsCancelled()) {
alarm_.experimental().Set(
gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_micros(request->param().client_cancel_after_us(),
GPR_TIMESPAN)),
recurrence);
} else {
controller->Finish(Status::CANCELLED);
}
};
recurrence(true);
return;
} else if (request->has_param() &&
request->param().server_cancel_after_us()) {
alarm_.experimental().Set(
gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_micros(request->param().server_cancel_after_us(),
GPR_TIMESPAN)),
[controller](bool) { controller->Finish(Status::CANCELLED); });
return;
} else if (!request->has_param() ||
!request->param().skip_cancelled_check()) {
EXPECT_FALSE(context->IsCancelled());
}
if (request->has_param() && request->param().echo_metadata()) {
const std::multimap<grpc::string_ref, grpc::string_ref>& client_metadata =
context->client_metadata();
for (std::multimap<grpc::string_ref, grpc::string_ref>::const_iterator
iter = client_metadata.begin();
iter != client_metadata.end(); ++iter) {
context->AddTrailingMetadata(ToString(iter->first),
ToString(iter->second));
}
// Terminate rpc with error and debug info in trailer.
if (request->param().debug_info().stack_entries_size() ||
!request->param().debug_info().detail().empty()) {
grpc::string serialized_debug_info =
request->param().debug_info().SerializeAsString();
context->AddTrailingMetadata(kDebugInfoTrailerKey, serialized_debug_info);
controller->Finish(Status::CANCELLED);
return;
}
}
if (request->has_param() &&
(request->param().expected_client_identity().length() > 0 ||
request->param().check_auth_context())) {
CheckServerAuthContext(context,
request->param().expected_transport_security_type(),
request->param().expected_client_identity());
}
if (request->has_param() && request->param().response_message_length() > 0) {
response->set_message(
grpc::string(request->param().response_message_length(), '\0'));
}
if (request->has_param() && request->param().echo_peer()) {
response->mutable_param()->set_peer(context->peer());
}
controller->Finish(Status::OK);
}
// Unimplemented is left unimplemented to test the returned error.
Status TestServiceImpl::RequestStream(ServerContext* context,
ServerReader<EchoRequest>* reader,
EchoResponse* response) {
// If 'server_try_cancel' is set in the metadata, the RPC is cancelled by
// the server by calling ServerContext::TryCancel() depending on the value:
// CANCEL_BEFORE_PROCESSING: The RPC is cancelled before the server reads
// any message from the client
// CANCEL_DURING_PROCESSING: The RPC is cancelled while the server is
// reading messages from the client
// CANCEL_AFTER_PROCESSING: The RPC is cancelled after the server reads
// all the messages from the client
int server_try_cancel = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
EchoRequest request;
response->set_message("");
if (server_try_cancel == CANCEL_BEFORE_PROCESSING) {
ServerTryCancel(context);
return Status::CANCELLED;
}
std::thread* server_try_cancel_thd = nullptr;
if (server_try_cancel == CANCEL_DURING_PROCESSING) {
server_try_cancel_thd =
new std::thread([context] { ServerTryCancel(context); });
}
int num_msgs_read = 0;
while (reader->Read(&request)) {
response->mutable_message()->append(request.message());
}
gpr_log(GPR_INFO, "Read: %d messages", num_msgs_read);
if (server_try_cancel_thd != nullptr) {
server_try_cancel_thd->join();
delete server_try_cancel_thd;
return Status::CANCELLED;
}
if (server_try_cancel == CANCEL_AFTER_PROCESSING) {
ServerTryCancel(context);
return Status::CANCELLED;
}
return Status::OK;
}
// Return 'kNumResponseStreamMsgs' messages.
// TODO(yangg) make it generic by adding a parameter into EchoRequest
Status TestServiceImpl::ResponseStream(ServerContext* context,
const EchoRequest* request,
ServerWriter<EchoResponse>* writer) {
// If server_try_cancel is set in the metadata, the RPC is cancelled by the
// server by calling ServerContext::TryCancel() depending on the value:
// CANCEL_BEFORE_PROCESSING: The RPC is cancelled before the server writes
// any messages to the client
// CANCEL_DURING_PROCESSING: The RPC is cancelled while the server is
// writing messages to the client
// CANCEL_AFTER_PROCESSING: The RPC is cancelled after the server writes
// all the messages to the client
int server_try_cancel = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
int server_coalescing_api = GetIntValueFromMetadata(
kServerUseCoalescingApi, context->client_metadata(), 0);
int server_responses_to_send = GetIntValueFromMetadata(
kServerResponseStreamsToSend, context->client_metadata(),
kServerDefaultResponseStreamsToSend);
if (server_try_cancel == CANCEL_BEFORE_PROCESSING) {
ServerTryCancel(context);
return Status::CANCELLED;
}
EchoResponse response;
std::thread* server_try_cancel_thd = nullptr;
if (server_try_cancel == CANCEL_DURING_PROCESSING) {
server_try_cancel_thd =
new std::thread([context] { ServerTryCancel(context); });
}
for (int i = 0; i < server_responses_to_send; i++) {
response.set_message(request->message() + grpc::to_string(i));
if (i == server_responses_to_send - 1 && server_coalescing_api != 0) {
writer->WriteLast(response, WriteOptions());
} else {
writer->Write(response);
}
}
if (server_try_cancel_thd != nullptr) {
server_try_cancel_thd->join();
delete server_try_cancel_thd;
return Status::CANCELLED;
}
if (server_try_cancel == CANCEL_AFTER_PROCESSING) {
ServerTryCancel(context);
return Status::CANCELLED;
}
return Status::OK;
}
Status TestServiceImpl::BidiStream(
ServerContext* context,
ServerReaderWriter<EchoResponse, EchoRequest>* stream) {
// If server_try_cancel is set in the metadata, the RPC is cancelled by the
// server by calling ServerContext::TryCancel() depending on the value:
// CANCEL_BEFORE_PROCESSING: The RPC is cancelled before the server reads/
// writes any messages from/to the client
// CANCEL_DURING_PROCESSING: The RPC is cancelled while the server is
// reading/writing messages from/to the client
// CANCEL_AFTER_PROCESSING: The RPC is cancelled after the server
// reads/writes all messages from/to the client
int server_try_cancel = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
EchoRequest request;
EchoResponse response;
if (server_try_cancel == CANCEL_BEFORE_PROCESSING) {
ServerTryCancel(context);
return Status::CANCELLED;
}
std::thread* server_try_cancel_thd = nullptr;
if (server_try_cancel == CANCEL_DURING_PROCESSING) {
server_try_cancel_thd =
new std::thread([context] { ServerTryCancel(context); });
}
// kServerFinishAfterNReads suggests after how many reads, the server should
// write the last message and send status (coalesced using WriteLast)
int server_write_last = GetIntValueFromMetadata(
kServerFinishAfterNReads, context->client_metadata(), 0);
int read_counts = 0;
while (stream->Read(&request)) {
read_counts++;
gpr_log(GPR_INFO, "recv msg %s", request.message().c_str());
response.set_message(request.message());
if (read_counts == server_write_last) {
stream->WriteLast(response, WriteOptions());
} else {
stream->Write(response);
}
}
if (server_try_cancel_thd != nullptr) {
server_try_cancel_thd->join();
delete server_try_cancel_thd;
return Status::CANCELLED;
}
if (server_try_cancel == CANCEL_AFTER_PROCESSING) {
ServerTryCancel(context);
return Status::CANCELLED;
}
return Status::OK;
}
experimental::ServerReadReactor<EchoRequest, EchoResponse>*
CallbackTestServiceImpl::RequestStream() {
class Reactor : public ::grpc::experimental::ServerReadReactor<EchoRequest,
EchoResponse> {
public:
Reactor() {}
void OnStarted(ServerContext* context, EchoResponse* response) override {
ctx_ = context;
response_ = response;
// If 'server_try_cancel' is set in the metadata, the RPC is cancelled by
// the server by calling ServerContext::TryCancel() depending on the
// value:
// CANCEL_BEFORE_PROCESSING: The RPC is cancelled before the server
// reads any message from the client CANCEL_DURING_PROCESSING: The RPC
// is cancelled while the server is reading messages from the client
// CANCEL_AFTER_PROCESSING: The RPC is cancelled after the server reads
// all the messages from the client
server_try_cancel_ = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
response_->set_message("");
if (server_try_cancel_ == CANCEL_BEFORE_PROCESSING) {
ServerTryCancelNonblocking(ctx_);
return;
}
if (server_try_cancel_ == CANCEL_DURING_PROCESSING) {
ctx_->TryCancel();
// Don't wait for it here
}
StartRead(&request_);
}
void OnDone() override { delete this; }
void OnCancel() override {
EXPECT_TRUE(ctx_->IsCancelled());
FinishOnce(Status::CANCELLED);
}
void OnReadDone(bool ok) override {
if (ok) {
response_->mutable_message()->append(request_.message());
num_msgs_read_++;
StartRead(&request_);
} else {
gpr_log(GPR_INFO, "Read: %d messages", num_msgs_read_);
if (server_try_cancel_ == CANCEL_DURING_PROCESSING) {
// Let OnCancel recover this
return;
}
if (server_try_cancel_ == CANCEL_AFTER_PROCESSING) {
ServerTryCancelNonblocking(ctx_);
return;
}
FinishOnce(Status::OK);
}
}
private:
void FinishOnce(const Status& s) {
std::lock_guard<std::mutex> l(finish_mu_);
if (!finished_) {
Finish(s);
finished_ = true;
}
}
ServerContext* ctx_;
EchoResponse* response_;
EchoRequest request_;
int num_msgs_read_{0};
int server_try_cancel_;
std::mutex finish_mu_;
bool finished_{false};
};
return new Reactor;
}
// Return 'kNumResponseStreamMsgs' messages.
// TODO(yangg) make it generic by adding a parameter into EchoRequest
experimental::ServerWriteReactor<EchoRequest, EchoResponse>*
CallbackTestServiceImpl::ResponseStream() {
class Reactor
: public ::grpc::experimental::ServerWriteReactor<EchoRequest,
EchoResponse> {
public:
Reactor() {}
void OnStarted(ServerContext* context,
const EchoRequest* request) override {
ctx_ = context;
request_ = request;
// If 'server_try_cancel' is set in the metadata, the RPC is cancelled by
// the server by calling ServerContext::TryCancel() depending on the
// value:
// CANCEL_BEFORE_PROCESSING: The RPC is cancelled before the server
// reads any message from the client CANCEL_DURING_PROCESSING: The RPC
// is cancelled while the server is reading messages from the client
// CANCEL_AFTER_PROCESSING: The RPC is cancelled after the server reads
// all the messages from the client
server_try_cancel_ = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
server_coalescing_api_ = GetIntValueFromMetadata(
kServerUseCoalescingApi, context->client_metadata(), 0);
server_responses_to_send_ = GetIntValueFromMetadata(
kServerResponseStreamsToSend, context->client_metadata(),
kServerDefaultResponseStreamsToSend);
if (server_try_cancel_ == CANCEL_BEFORE_PROCESSING) {
ServerTryCancelNonblocking(ctx_);
return;
}
if (server_try_cancel_ == CANCEL_DURING_PROCESSING) {
ctx_->TryCancel();
}
if (num_msgs_sent_ < server_responses_to_send_) {
NextWrite();
}
}
void OnDone() override { delete this; }
void OnCancel() override {
EXPECT_TRUE(ctx_->IsCancelled());
FinishOnce(Status::CANCELLED);
}
void OnWriteDone(bool ok) override {
if (num_msgs_sent_ < server_responses_to_send_) {
NextWrite();
} else if (server_coalescing_api_ != 0) {
// We would have already done Finish just after the WriteLast
} else if (server_try_cancel_ == CANCEL_DURING_PROCESSING) {
// Let OnCancel recover this
} else if (server_try_cancel_ == CANCEL_AFTER_PROCESSING) {
ServerTryCancelNonblocking(ctx_);
} else {
FinishOnce(Status::OK);
}
}
private:
void FinishOnce(const Status& s) {
std::lock_guard<std::mutex> l(finish_mu_);
if (!finished_) {
Finish(s);
finished_ = true;
}
}
void NextWrite() {
response_.set_message(request_->message() +
grpc::to_string(num_msgs_sent_));
if (num_msgs_sent_ == server_responses_to_send_ - 1 &&
server_coalescing_api_ != 0) {
num_msgs_sent_++;
StartWriteLast(&response_, WriteOptions());
// If we use WriteLast, we shouldn't wait before attempting Finish
FinishOnce(Status::OK);
} else {
num_msgs_sent_++;
StartWrite(&response_);
}
}
ServerContext* ctx_;
const EchoRequest* request_;
EchoResponse response_;
int num_msgs_sent_{0};
int server_try_cancel_;
int server_coalescing_api_;
int server_responses_to_send_;
std::mutex finish_mu_;
bool finished_{false};
};
return new Reactor;
}
experimental::ServerBidiReactor<EchoRequest, EchoResponse>*
CallbackTestServiceImpl::BidiStream() {
class Reactor : public ::grpc::experimental::ServerBidiReactor<EchoRequest,
EchoResponse> {
public:
Reactor() {}
void OnStarted(ServerContext* context) override {
ctx_ = context;
// If 'server_try_cancel' is set in the metadata, the RPC is cancelled by
// the server by calling ServerContext::TryCancel() depending on the
// value:
// CANCEL_BEFORE_PROCESSING: The RPC is cancelled before the server
// reads any message from the client CANCEL_DURING_PROCESSING: The RPC
// is cancelled while the server is reading messages from the client
// CANCEL_AFTER_PROCESSING: The RPC is cancelled after the server reads
// all the messages from the client
server_try_cancel_ = GetIntValueFromMetadata(
kServerTryCancelRequest, context->client_metadata(), DO_NOT_CANCEL);
server_write_last_ = GetIntValueFromMetadata(
kServerFinishAfterNReads, context->client_metadata(), 0);
if (server_try_cancel_ == CANCEL_BEFORE_PROCESSING) {
ServerTryCancelNonblocking(ctx_);
return;
}
if (server_try_cancel_ == CANCEL_DURING_PROCESSING) {
ctx_->TryCancel();
}
StartRead(&request_);
}
void OnDone() override { delete this; }
void OnCancel() override {
EXPECT_TRUE(ctx_->IsCancelled());
FinishOnce(Status::CANCELLED);
}
void OnReadDone(bool ok) override {
if (ok) {
num_msgs_read_++;
gpr_log(GPR_INFO, "recv msg %s", request_.message().c_str());
response_.set_message(request_.message());
if (num_msgs_read_ == server_write_last_) {
StartWriteLast(&response_, WriteOptions());
// If we use WriteLast, we shouldn't wait before attempting Finish
} else {
StartWrite(&response_);
return;
}
}
if (server_try_cancel_ == CANCEL_DURING_PROCESSING) {
// Let OnCancel handle this
} else if (server_try_cancel_ == CANCEL_AFTER_PROCESSING) {
ServerTryCancelNonblocking(ctx_);
} else {
FinishOnce(Status::OK);
}
}
void OnWriteDone(bool ok) override {
std::lock_guard<std::mutex> l(finish_mu_);
if (!finished_) {
StartRead(&request_);
}
}
private:
void FinishOnce(const Status& s) {
std::lock_guard<std::mutex> l(finish_mu_);
if (!finished_) {
Finish(s);
finished_ = true;
}
}
ServerContext* ctx_;
EchoRequest request_;
EchoResponse response_;
int num_msgs_read_{0};
int server_try_cancel_;
int server_write_last_;
std::mutex finish_mu_;
bool finished_{false};
};
return new Reactor;
}
} // namespace testing
} // namespace grpc