Build: Build a gRPC service from a .proto definition

0/1 steps

✓📚 Read

✓👁 See

✓🎞 Animate

✓🎯 Test

5⚙️ Build

Build Steps

Progress

0/1

◆ Before you start

Prerequisites

Python 3.11+Required
python --version
grpcio, grpcio-toolsRequired
pip install grpcio grpcio-tools

⚡

Step 1 of 1

Build a gRPC service from a .proto definition

Define a service in Protocol Buffers, generate Python code, implement the server, and call it from a client.

Tasks

Write greeter.proto with a Greeter service and SayHello RPC

Generate stubs: python -m grpc_tools.protoc

Implement the GreeterServicer class

Start the server on port 50051 and verify it accepts connections

Write a client that calls SayHello and prints the response

🎯 What You'll Learn

▸Write a .proto file with request/response messages
▸Generate Python gRPC stubs from .proto
▸Implement and run a gRPC server + client

Code

PROTOBUFgreeter.proto
1 syntax = "proto3";
2  
3 package greeter;
4  
5 service Greeter {
6   rpc SayHello (HelloRequest) returns (HelloReply);
7   rpc SayHelloStream (HelloRequest) returns (stream HelloReply);
8 }
9  
10 message HelloRequest {
11   string name = 1;
12   string language = 2;
13 }
14  
15 message HelloReply {
16   string message = 1;
17   int64 timestamp = 2;
18 }
19

💡 Pro Tips

▸Always use proto3 syntax for new services
▸Use server reflection (grpc_reflection) for debugging without the .proto file

Discussion