gRPC Interactive Deep Dive 18 Steps

Master client stubs, server skeletons, Protobuf framing, and HTTP/2 multiplexing lifecycle

Step 1 of 18

ORDER SERVICE CLIENT

Java Stub

Client Application caller

service.sayHello(req);

State: Idle Deadline: 100ms

gRPC Stub (Protobuf)

stub

Serializer

Protobuf

Unmarshaler

Protobuf

Status: Ready Bytes: 0 B

HTTP/2 Transport Layer multiplexer

Streams: 0 Active

HPACK: Enabled

Conn: 1 TCP Pipe State: Established

HTTP/2 TCP PIPE

Transport

RTT Latency: 120ms

Mux: Stream #1/#3 In-Flight: 0

PAYMENT SERVICE SERVER

Go Skeleton

HTTP/2 Server Layer demux

Streams: 0 Active

HPACK: Enabled

State: Listening Trailers: grpc-status

Server Skeleton (gRPC)

skeleton

Unmarshaler

Protobuf

Serializer

Protobuf

Status: Waiting Processed: 0 B

Service Implementation handler

func (s *Server) SayHello(...)

State: Listening Status: 0 (OK)

Step 1 of 18 Setup

1. The Contract: API Definition

Start with a .proto file. It defines the service, method, request, and response so the client and server agree on the same contract.

Component Inspector

Order Service Client

Current state: Order Service Client is responsible for the active step in the gRPC walkthrough.

What this component is doing now

Declaring the shared Greeter service and typed message contract.

Why this component matters

Contract-first .proto schemas eliminate mismatched field names and runtime deserialization bugs.

How this component works with the rest of the system

Feeds protoc to generate Java client stubs and Go server skeletons over HTTP/2.

syntax = "proto3";
service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest { string name = 1; int32 id = 2; }
message HelloReply { string message = 1; }

// Auto-generated Java Stub code (GreeterBlockingStub)
public final class GreeterGrpc {
  public static class GreeterBlockingStub {
    public HelloReply sayHello(HelloRequest req) {
      return blockingUnaryCall(..., req);
    }
  }
}

ORDER SERVICE CLIENT

HTTP/2 TCP PIPE

PAYMENT SERVICE SERVER

System Alert

Component