gRPC-haskell/examples/hellos/hellos-cpp/hellos_server.cc
Joel Stanley 096d399b30 MONAPP-1035: Fix errant hang on metadata exchange in Haskell client-side bidirectional streaming (#70)
* (wip) Change ClientRWHandler to use an IO action for metadata acqui

* Demonstrate placement of WaitForInitialMetadata() in hellos_client

* Make hellos cpp server always send metadata first, for now

* Show getMD placement in haskell hellos-client

* Add prelim bidi metadata exchange behavior tweaks to line up with C++ API conventions
2016-08-15 12:55:40 -05:00

88 lines
2.4 KiB
C++

#include <iostream>
#include <memory>
#include <string>
#include <grpc++/grpc++.h>
#include "hellos.grpc.pb.h"
using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::ServerWriter;
using grpc::ServerReader;
using grpc::ServerReaderWriter;
using grpc::Status;
using hellos::SSRqt;
using hellos::SSRpy;
using hellos::CSRqt;
using hellos::CSRpy;
using hellos::BiRqtRpy;
using hellos::Hellos;
static void Die(const std::string& msg) {
std::cerr << "Fatal error: " << msg << std::endl;
exit(1);
}
class HellosImpl final : public Hellos::Service {
Status HelloSS(ServerContext* context,
const SSRqt* rqt,
ServerWriter<SSRpy>* writer) override {
for (unsigned i = 0; i < rqt->num_replies(); ++i) {
SSRpy rpy;
rpy.set_greeting("Hello there, " + rqt->name() + "!");
writer->Write(rpy);
}
return Status::OK;
}
Status HelloCS(ServerContext* context,
ServerReader<CSRqt>* reader,
CSRpy* rpy) override {
CSRqt rqt;
unsigned rqtCnt = 0;
std::string ex("client streaming payload");
while (reader->Read(&rqt)) {
if (rqt.message() != ex)
Die("HelloCS/rpy: expected payload '" + ex +
"', got '" + rqt.message() + "'");
++rqtCnt;
}
rpy->set_num_requests(rqtCnt);
return Status::OK;
}
Status HelloBi(ServerContext* context,
ServerReaderWriter<BiRqtRpy, BiRqtRpy>* strm) override {
BiRqtRpy rqt;
strm->SendInitialMetadata();
while (strm->Read(&rqt)) {
strm->Write(rqt);
}
return Status::OK;
}
};
void RunServer() {
std::string server_address("0.0.0.0:50051");
HellosImpl service;
ServerBuilder builder;
// Listen on the given address without any authentication mechanism.
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
// Register "service" as the instance through which we'll communicate with
// clients. In this case it corresponds to an *synchronous* service.
builder.RegisterService(&service);
// Finally assemble the server.
std::unique_ptr<Server> server(builder.BuildAndStart());
std::cout << "Server listening on " << server_address << std::endl;
// Wait for the server to shutdown. Note that some other thread must be
// responsible for shutting down the server for this call to ever return.
server->Wait();
}
int main(int argc, char** argv) {
RunServer();
return 0;
}