How to add multiple services in grpc-js server?

Question

Lets say I have .proto file like below:

service SvcOne{
    rpc MehtodOne(RequestOne) returns (ResponseOne) {}
}

service SvcTwo{
    rpc MethodTwo(RequestTwo) returns (ResponseTwo) {}
}

message RequestOne {
    string field_req= 1;
}

message ResponseOne {
    string field_res = 1;
}

message RequestTwo {
    string field_req= 1;
}

message ResponseTwo {
    string field_res = 1;
}

and then I try the code like below :

const server = new grpc.Server();      
server.addService(protoSchema.SvcOne.service, {MehtodOne: MethodOne});
server.addService(protoSchema.SvcTwo.service, {MethodTwo: MethodTwo});
server.bindAsync(
    "0.0.0.0:50051",
    grpc.ServerCredentials.createInsecure(),
    (err) => {
      if (err) {
        console.log("Error!");
      } else {
        routeServer.start();
        console.log("Server ready...");
      }
    }
  );

but got an error like this :

TypeError: Cannot read property 'service' of undefined

So I think I missing something in between.

The question: How to bind multiple services (SvcOne & SvcTwo) in grpc-js server ? or is that not possible in grpc-js ?

score 1 · Accepted Answer · answered Aug 07 '21 at 04:01

What I'm doing for this kind of scenario is define different services on it's own block in one proto file.

package servicePackage;

service Service1 {
    rpc Get(Empty) returns (Empty);
    rpc Insert(Empty) returns (Empty);
    rpc Remove(Empty) returns (Empty);
    rpc Update(Empty) returns (Empty);
}

service Service2 {
    rpc Get(Empty) returns (Empty);
    rpc Insert(Empty) returns (Empty);
    rpc Remove(Empty) returns (Empty);
    rpc Update(Empty) returns (Empty);
}

Then on addService just use each service name

server.addService(grpcPackage.Service1.service, {
   Insert: async (call, callback) => {
       callback(null, null);
   },
});

server.addService(grpcPackage.Service2.service, {
   Insert: async (call, callback) => {
       callback(null, null);
   },
});

The rest like binding, protoLoading, server.start() stays the same.

score 0 · Answer 2 · answered Jun 10 '21 at 01:26

0

Please reference route_guide_server, did you load definition before add start server like this?

answered Jun 10 '21 at 01:26

HelloWood

727
4
13

Yes I do route guide and load proto definition before add start server like the link you provided. The problem only accour when adding 2nd `server.addService()`, If I only use one `server.addService()` it working fine without any problem. @HelloWood – Bram Jun 10 '21 at 09:35

How to add multiple services in grpc-js server?

2 Answers2