KCD Taipei 2025 CLBO Contest: MinIO

README.md

KCD Taipei 2025 CLBO 挑戰賽

說明

ClashApp 是一個 Golang 應用服務，提供以下三個 API

• GET /health: 健康檢查
• GET /ready: 服務是否就緒
• POST /upload: 上傳檔案，並存到 MinIO

這個服務需要四個環境變數：

• MINIO_ENDPOINT
• MINIO_ACCESS_KEY
• MINIO_SECRET_KEY
• MINIO_BUCKET_NAME

Dockerfile 已經就緒，參賽者可以直接建立你專屬的 Image。

噢不！

不幸地，健忘的小精靈沒有更新 deployment.yaml，啟動這個 K8s 叢集遇到好多錯誤。而且，她也忘記附上 MinIO 的配置檔，讓同事好著急⋯⋯聰明的你，可以幫我們建立 MinIO 服務，並讓 ClashApp 順利運作起來嗎？

deployment.yaml

# bad-app-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: clash-app
  labels:
    app: clash-app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: clash-app
  template:
    metadata:
      labels:
        app: clash-app
    spec:
      containers:
      - name: clash-app
        image: your-app-image:latest # please build your image
        ports:
        - containerPort: 8080
        envFrom:
        - configMapRef:
            name: clash-app-config
        env:
        - name: MINIO_SECRET_KEY
          value: "my_secret"
        resources:
          requests:
            memory: "5Mi"
            cpu: "10m"
          limits:
            memory: "10Mi"
            cpu: "50m"
        livenessProbe:
          httpGet:
            path: /haelth
            port: 8080
          initialDelaySeconds: 1
          periodSeconds: 3
          failureThreshold: 1
        readinessProbe:
          httpGet:
            path: /readyz
            port: 8080
          initialDelaySeconds: 1
          periodSeconds: 3
          failureThreshold: 1

Dockerfile

FROM golang:1.24.4-alpine3.22

RUN mkdir -p /app

COPY go.mod go.sum main.go /app

WORKDIR /app

RUN go build -o clbo main.go

CMD ["./clbo"]

EXPOSE 8080

go.mod

module example.com/kcd_clbo

go 1.24.1

require github.com/minio/minio-go/v7 v7.0.93

require (
	github.com/davecgh/go-spew v1.1.1 // indirect
	github.com/dustin/go-humanize v1.0.1 // indirect
	github.com/go-ini/ini v1.67.0 // indirect
	github.com/goccy/go-json v0.10.5 // indirect
	github.com/google/uuid v1.6.0 // indirect
	github.com/klauspost/compress v1.18.0 // indirect
	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
	github.com/minio/crc64nvme v1.0.1 // indirect
	github.com/minio/md5-simd v1.1.2 // indirect
	github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c // indirect
	github.com/pmezard/go-difflib v1.0.0 // indirect
	github.com/rs/xid v1.6.0 // indirect
	github.com/tinylib/msgp v1.3.0 // indirect
	golang.org/x/crypto v0.36.0 // indirect
	golang.org/x/net v0.38.0 // indirect
	golang.org/x/sys v0.31.0 // indirect
	golang.org/x/text v0.23.0 // indirect
	gopkg.in/yaml.v3 v3.0.1 // indirect
)

go.sum

github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
github.com/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=
github.com/go-ini/ini v1.67.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
github.com/goccy/go-json v0.10.5/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
github.com/klauspost/cpuid/v2 v2.2.10 h1:tBs3QSyvjDyFTq3uoc/9xFpCuOsJQFNPiAhYdw2skhE=
github.com/klauspost/cpuid/v2 v2.2.10/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
github.com/minio/crc64nvme v1.0.1 h1:DHQPrYPdqK7jQG/Ls5CTBZWeex/2FMS3G5XGkycuFrY=
github.com/minio/crc64nvme v1.0.1/go.mod h1:eVfm2fAzLlxMdUGc0EEBGSMmPwmXD5XiNRpnu9J3bvg=
github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
github.com/minio/minio-go/v7 v7.0.93 h1:lAB4QJp8Nq3vDMOU0eKgMuyBiEGMNlXQ5Glc8qAxqSU=
github.com/minio/minio-go/v7 v7.0.93/go.mod h1:71t2CqDt3ThzESgZUlU1rBN54mksGGlkLcFgguDnnAc=
github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c h1:dAMKvw0MlJT1GshSTtih8C2gDs04w8dReiOGXrGLNoY=
github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c/go.mod h1:RqIHx9QI14HlwKwm98g9Re5prTQ6LdeRQn+gXJFxsJM=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rs/xid v1.6.0 h1:fV591PaemRlL6JfRxGDEPl69wICngIQ3shQtzfy2gxU=
github.com/rs/xid v1.6.0/go.mod h1:7XoLgs4eV+QndskICGsho+ADou8ySMSjJKDIan90Nz0=
github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
github.com/tinylib/msgp v1.3.0 h1:ULuf7GPooDaIlbyvgAxBV/FI7ynli6LZ1/nVUNu+0ww=
github.com/tinylib/msgp v1.3.0/go.mod h1:ykjzy2wzgrlvpDCRc4LA8UXy6D8bzMSuAF3WD57Gok0=
golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

// ClashApp - 簡單的 Golang 應用程式
package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"time"

	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"
)

var (
	endpoint        string = os.Getenv("MINIO_ENDPOINT")
	accessKeyID     string = os.Getenv("MINIO_ACCESS_KEY")
	secretAccessKey string = os.Getenv("MINIO_SECRET_KEY")
	bucketName      string = os.Getenv("MINIO_BUCKET_NAME")

	minioClient *minio.Client
)

func main() {
	log.Println("正在啟動 ClashApp...")

	if endpoint == "" || accessKeyID == "" || secretAccessKey == "" || bucketName == "" {
		log.Fatalf("錯誤: MINIO_ENDPOINT, MINIO_ACCESS_KEY, MINIO_SECRET_KEY, BUCKET_NAME 環境變數必須設定!")
	}

	// 初始化 MinIO 客戶端 (如果配置錯誤，這裡可能會 panic 或後續操作失敗)
	log.Printf("嘗試連接 MinIO: %s\n", endpoint)
	var err error
	minioClient, err = minio.New(endpoint, &minio.Options{
		Creds: credentials.NewStaticV4(accessKeyID, secretAccessKey, ""),
	})
	if err != nil {
		log.Fatalf("初始化 MinIO 客戶端失敗: %v", err)
	}

	log.Printf("成功初始化 MinIO 客戶端")

	log.Println("檢查 MinIO Bucket...")
	ok, err := minioClient.BucketExists(context.Background(), bucketName)
	if err != nil {
		log.Fatalf("檢查 Bucket '%s' 失敗: %v", bucketName, err)
	}
	if !ok {
		log.Fatalf("Bucket '%s' 不存在!", bucketName)
	}
	log.Printf("Bucket '%s' 存在。\n", bucketName)

	http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
		// 一個非常基礎的健康檢查，實際應用應更完善
		fmt.Fprintf(w, "ok")
	})

	http.HandleFunc("/ready", func(w http.ResponseWriter, r *http.Request) {
		// 模擬準備就緒探針，應檢查 MinIO 連接等
		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
		defer cancel()
		_, err := minioClient.BucketExists(ctx, bucketName)
		if err != nil {
			http.Error(w, "MinIO not ready", http.StatusServiceUnavailable)
			return
		}
		fmt.Fprintf(w, "ready")
	})

	http.HandleFunc("/upload", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
			return
		}

		// 限制最大上傳大小 (例如 10MB)
		r.Body = http.MaxBytesReader(w, r.Body, 10<<20)
		err := r.ParseMultipartForm(10 << 20)
		if err != nil {
			http.Error(w, "檔案太大或格式錯誤", http.StatusBadRequest)
			return
		}

		file, handler, err := r.FormFile("file")
		if err != nil {
			http.Error(w, "無法取得上傳檔案", http.StatusBadRequest)
			return
		}
		defer file.Close()

		objectName := handler.Filename
		contentType := handler.Header.Get("Content-Type")
		if contentType == "" {
			contentType = "application/octet-stream"
		}

		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()

		info, err := minioClient.PutObject(ctx, bucketName, objectName, file, handler.Size, minio.PutObjectOptions{
			ContentType: contentType,
		})
		if err != nil {
			log.Printf("上傳到 MinIO 失敗: %v", err)
			http.Error(w, "上傳失敗", http.StatusInternalServerError)
			return
		}

		log.Printf("成功上傳: %s (%d bytes)", info.Key, info.Size)
		fmt.Fprintf(w, "uploaded: %s\n", info.Key)
	})

	log.Println("ClashApp 正在監聽 :8080")
	if err := http.ListenAndServe(":8080", nil); err != nil {
		log.Fatalf("無法啟動 HTTP 伺服器: %v", err)
	}
}