Pardon the newbie question. I am getting started with gRPC, and hitting a
basic issue where the client gets an error code for the RPC call:
Error code: 14 Err msg: Endpoint read failed
TL;DR Server starts fine. Netstat shows it is listening on the port. Client
fails to connect to netcat on same address as well.
The service is very simple:
<snip>
syntax = "proto3";
service MySvc { // name edited
rpc GetVersion(Version) returns (Version) {}
}
message Version {
int32 version = 1;
}
</snip>
The compilation succeeds with g++ 4.8.5 and "-Wall". The server starts up
fine and prints:
<snip>
I0606 16:17:24.415181976 4792 server_builder.cc:247] Synchronous
server. Num CQs: 1, Min pollers: 1, Max Pollers: 2147483647, CQ timeout
(msec): 1000
Server listening on 127.0.0.1:50051
</snip>
The command 'netstat -tulpn | grep ...' shows that the server is listening:
tcp6 0 0 127.0.0.1:50051 :::*
LISTEN 4792/./<service-name>
I also ran 'nc -l 127.0.0.1 50051' and executed the client binary. The
netcat got nothing. So, the issue seems be on the client side.
Here is my client code:
<snip>
class MySvcClient {
public:
MySvcClient(std::shared_ptr<Channel> channel)
: stub_(MySvc::NewStub(channel)) {}
int GetServerVersion(int version) {
Version client_version, server_version;
ClientContext ctx;
client_version.set_version(version);
Status status = stub_->GetVersion(&ctx, client_version,
&server_version);
cout << "Error code: " << status.error_code();
cout << " Err msg: " << status.error_message() << endl;
if (status.ok()) {
cout << "Server version: " << server_version.version() << endl;
return server_version.version();
} else {
cout << "Failed to get Server version: " << endl;
return -1;
}
}
private:
unique_ptr<MySvc::Stub> stub_;
};
int main(int argc, char** argv) {
MySvcClient client(grpc::CreateChannel(
"127.0.0.1:50051", grpc::InsecureChannelCredentials()));
int myversion = 2;
int server_version = client.GetServerVersion(myversion);
cout << "Server version: " << server_version << endl;
return 0;
}
</snip>
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