Docker + Go言語 + gRPC で簡単なWebアプリケーションを作る　その１

go mod init example.com/myproject

go install google.golang.org/grpc@latest
go install github.com/golang/protobuf/protoc-gen-go@latest

cd \path\to\my-web-app

my-web-app
├── main.go
├── pb
│   └── greeter.proto
└── Dockerfile

// main.go

package main

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, this is a simple HTTP server!")
    })

    log.Fatal(http.ListenAndServe(":8080", nil))
}
 

// pb/greeter.proto

syntax = "proto3";

package pb;

message HelloRequest {
    string name = 1;
}

message HelloResponse {
    string message = 1;
}

service Greeter {
    rpc SayHello (HelloRequest) returns (HelloResponse);
}
 

# Dockerfile

FROM golang:latest

WORKDIR /app

COPY . .

RUN go build -o main .

EXPOSE 8080

CMD ["./main"]
 

docker build -t my-web-app .
docker run -p 8080:8080 my-web-app