Can gRPC Stream Data from Server to Client in a Pub/Sub Pattern?

Streaming Data with gRPC: Push or Pull?

Question:

Can one utilize gRPC to push data from server to client? Consider a pub/sub pattern with an infinite response stream on server and a never-ending routine on client that constantly reads from this stream.

// Service proto
service Service {
    rpc RegularChanges (Void) returns (stream Change) {}
}

// Server implementation
func (self *MyServiceImpl) RegularChanges(in *pb.Void, stream pb.Service_RegularChangesServer) error {
    for {
        stream.Send(&pb.Change{Name:"toto", Description:"status changed"})
        time.Sleep(d)
    }
    return nil
}

// Client
for {
        change, err := streamChanges.Recv()
        if err != nil {
            // Handle error
        } else {
            // Process change
        }
}

Answer:

gRPC is designed for such usage, facilitating a publish/subscribe pattern between client and server. However, certain considerations should be addressed:

• Client Failure Handling: Determine how the client should respond to failures in communication.
• Backend Balancing: Consider mechanisms for load balancing if multiple backends are involved.
• Network Connectivity: Enable keepalive parameters for connections that traverse the Internet to detect connection interruptions.

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