Mendadak Goblok

gRPC is a high-performance, open-source Remote Procedure Call (RPC) framework developed by Google. It lets applications running on different machines (or in different services) talk to each other as if they were calling local functions.

About GRPC

1. Protocol

check_circle Uses HTTP/2 as the transport layer (faster, multiplexed connections, streaming support).
check_circle Data is serialized with Protocol Buffers (protobuf) by default (compact, fast, strongly typed).

2. Cross-language

check_circle Supports many languages: Go, Java, Python, C#, C++, Node.js, etc.
check_circle A client written in one language can easily communicate with a server written in another.

3. Service definition

check_circle You define your APIs in a .proto file.
check_circle gRPC generates client and server code for you from this definition.

4. Communication styles

check_circle Unary RPC (single request → single response)
check_circle Server streaming (single request → stream of responses)
check_circle Client streaming (stream of requests → single response)
check_circle Bidirectional streaming (stream of requests ↔ stream of responses)

5. Use cases

check_circle Microservices communication
check_circle Low-latency real-time apps
check_circle Connecting backend services in different languages
check_circle Mobile to server communication

Requirements

check_circle Go 1.23.11
check_circle Go grpc
check_circle Protobuf cmd
check_circle Grpc cmd

Let's get start

Create folder learn-grpc then open it with Goland IDE

We have to prepare some dependencies first
Download go grpc

go get google.golang.org/grpc

Install protoc, im using mac so i will execute with syntax:

brew install protoc-gen-go-grpc

or you can install binary on GOBIN:

Init package project:

go mod init id.pandz/learn/grpc-sample from path /learn-grpc

Create folder name it student
Now, create student/student.proto file

STUDENT.PROTO GO

syntax = "proto3";
option go_package = "id.pandz/learn/grpc-sample/student";

package student;

service DataStudent {
    rpc FindStudentByEmail(Student) returns (Student);
}

message Student {
    string name = 1;
    int32 age = 2;
    string email = 3;
}

Then we need to generate student.proto to golang language