feat(backend): ref #4 開発環境の用意

development/Makefile

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+up:
+	docker-compose -f docker-compose.yml up --build
+
+down:
+	docker-compose -f docker-compose.yml down

development/backend/Dockerfile

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+FROM golang:1.16.5-alpine3.13
+
+WORKDIR /development
+COPY development/backend/air.toml .
+
+WORKDIR /go/src/isucondition
+
+ENV DOCKERIZE_VERSION v0.6.1
+RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
+    && tar -C /usr/local/bin -xzvf dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
+    && rm dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
+    && go get -u github.com/cosmtrek/air
+
+COPY webapp/go/go.mod .
+# COPY webapp/go/go.sum .
+
+RUN go mod download

development/backend/air.toml

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+# Config file for [Air](https://github.com/cosmtrek/air) in TOML format
+
+# Working directory
+# . or absolute path, please note that the directories following must be under root.
+root = "/go/src/isucondition"
+tmp_dir = "tmp"
+
+[build]
+# Just plain old shell command. You could use `make` as well.
+cmd = "go build -o isucondition ."
+# Binary file yields from `cmd`.
+bin = "isucondition"
+# Customize binary.
+full_bin = "APP_ENV=dev APP_USER=air ./isucondition"
+# Watch these filename extensions.
+include_ext = ["go"]
+# Ignore these filename extensions or directories.
+exclude_dir = []
+# Watch these directories if you specified.
+include_dir = []
+# Exclude files.
+exclude_file = []
+# Exclude specific regular expressions.
+exclude_regex = []
+# Exclude unchanged files.
+exclude_unchanged = true
+# Follow symlink for directories
+follow_symlink = true
+# This log file places in your tmp_dir.
+log = "air.log"
+# It's not necessary to trigger build each time file changes if it's too frequent.
+delay = 1000 # ms
+# Stop running old binary when build errors occur.
+stop_on_error = true
+# Send Interrupt signal before killing process (windows does not support this feature)
+send_interrupt = false
+# Delay after sending Interrupt signal
+kill_delay = 500 # ms
+
+[log]
+# Show log time
+time = false
+
+[color]
+# Customize each part's color. If no color found, use the raw app log.
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+# Delete tmp directory on exit
+clean_on_exit = true

development/docker-compose.yml

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+version: "3.8"
+
+services: 
+  backend:
+    build: 
+      context: ..
+      dockerfile: development/backend/Dockerfile
+    environment: 
+      MYSQL_HOST: mysql-backend
+      MYSQL_PORT: 3306
+      MYSQL_DATABASE: isucondition
+      MYSQL_USER: isucon
+      MYSQL_PASSWORD: isucon
+    entrypoint: dockerize -wait tcp://mysql-backend:3306 -timeout 60s
+    command: air -c /development/air.toml
+    ports: 
+      - "3000:3000"
+    volumes: 
+      - "../webapp/go:/go/src/isucondition"
+    depends_on: 
+      - mysql-backend
+
+  mysql-backend:
+    image: mysql:8.0.25
+    restart: always
+    environment: 
+      MYSQL_DATABASE: isucondition
+      MYSQL_USER: isucon
+      MYSQL_PASSWORD: isucon
+      MYSQL_ROOT_PASSWORD: root
+    expose: 
+      - "3306"
+    ports: 
+      - "3306:3306"
+

webapp/go/.gitignore

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+isucondition

webapp/go/go.mod

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+module github.com/isucon/isucon11-qualify/isucondition
+
+go 1.16

webapp/go/main.go

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+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	for {
+		fmt.Println("Hello World")
+		time.Sleep(time.Second * 10)
+	}
+}