How about check what's happening on the network with wireshark?
On Tue, Jun 6, 2017 at 3:42 PM, <[email protected]> wrote:
> 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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