FROM golang:1.20.13

WORKDIR /go/src/app

RUN apt-get -qqy update && apt-get install -qqy curl apt-transport-https lsb-release gnupg sudo && \
        export GCSFUSE_REPO="gcsfuse-$(lsb_release -c -s)" && \
        echo "deb https://packages.cloud.google.com/apt $GCSFUSE_REPO main" > /etc/apt/sources.list.d/gcsfuse.list && \
        curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - && \
        apt-get update && apt-get install -y gcsfuse

COPY ./go.mod /go/src/app
COPY ./go.sum /go/src/app
COPY ./src /go/src/app/src
COPY run.sh /go/src/app
RUN chmod +x /go/src/app/run.sh

ENV MOUNT_DIR /go/src/app/gcs

RUN go mod tidy
EXPOSE 8080

CMD ["/go/src/app/run.sh"]

#!/bin/bash

mkdir $MOUNT_DIR
nohup gcsfuse --implicit-dirs --foreground --debug_gcs --debug_fuse miistin.appspot.com $MOUNT_DIR &

go run src/main.go

$ docker run --env GOOGLE_APPLICATION_CREDENTIALS=/app/src/go/mount/XXXXX.json --privileged -v .\mount:/app/src/go/mount -p 8080:8080 <IMAGE ID>

package main

import (
	"fmt"
	"log"
	"os"
	"regexp"
	"strings"

	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
)

func main() {
	e := echo.New()
	e.Use(middleware.Recover())
	e.Use(middleware.Logger())

	e.GET("/:dir/:path", func(c echo.Context) error {
		path := c.Param("path")

		r, _ := regexp.Compile(`.*\.\w+$`)
		if !r.MatchString(path) {
			return c.String(404, "Not Found")
		}

		extR, _ := regexp.Compile(`\.\w+$`)
		extension := strings.TrimPrefix(extR.FindString(path), ".")

		if extension == "jpg" {
			extension = "jpeg"
		}

		var contentType string
		switch extension {
		case "jpeg":
			contentType = "image/jpeg"
		case "png":
			contentType = "image/png"
		case "gif":
			contentType = "image/gif"
		case "webp":
			contentType = "image/webp"
		case "svg":
			contentType = "image/svg+xml"
		case "bmp":
			contentType = "image/bmp"
		case "ico":
			contentType = "image/vnd.microsoft.icon"
		case "json":
			contentType = "application/json"
		case "xml":
			contentType = "application/xml"
		case "pdf":
			contentType = "application/pdf"
		case "txt":
			contentType = "text/plain"
		default:
			contentType = "application/octet-stream"
		}

		ls, err := os.ReadFile(fmt.Sprintf("/go/src/app/gcs/%s/%s", c.Param("dir"), c.Param("path")))
		if err != nil {
			return c.String(404, "Not Found")
		}

		return c.Blob(200, contentType, ls)
	})

	log.Fatal(e.Start(fmt.Sprintf(":8080")))
}

・ src
　・ main.go
・ Dockerfile
・ go.mod
・ go.sum
・ run.sh

# Artifact Registry を使うための認証情報設定
# 下記は us-central1 のリージョンに配置する場合
$ gcloud auth configure-docker us-central1-docker.pkg.dev 

# レポジトリの作成
$ gcloud artifacts repositories create cloudrun-sample --location=us-central1 --repository-format=docker --project=[PROJECT_ID]

# docker のビルド
$ docker build -t us-central1-docker.pkg.dev/[PROJECT_ID]/cloudrun-sample/cloudrun-image:tag1 .

# dockerイメージのpush
$ docker push us-central1-docker.pkg.dev/[PROJECT_ID]/cloudrun-sample/cloudrun-image:tag1

$ gcloud run deploy cdnservice --image us-central1-docker.pkg.dev/[PROJECT_ID]/cloudrun-sample/cloudrun-image:tag1 --platform=managed --project=[PROJECT_ID]--region=asia-northeast1 --service-account [サービスアカウント]@[PROJECT_ID].iam.gserviceaccount.com

Deploying container to Cloud Run service [cdnservice] in project [xxxx] region [asia-northeast1]
✓ Deploying... Done.
  ✓ Creating Revision...
  ✓ Routing traffic...
Done.
Service [cdnservice] revision [cdnservice-00003-jeq] has been deployed and is serving 100 percent of traffic.
Service URL: https://cdnservice-xxxxxx-an.a.run.app

package main

import (
	"fmt"
	"io"
	"log"
	"regexp"
	"strings"

	"cloud.google.com/go/storage"
	"github.com/bradhe/stopwatch"
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
)

func main() {
	e := echo.New()
	e.Use(middleware.Recover())
	e.Use(middleware.Logger())

	e.GET("/:dir/:path", func(c echo.Context) error {
		client, err := storage.NewClient(c.Request().Context())
		if err != nil {
			return c.String(500, "Internal Server Error")
		}

		path := c.Param("path")
		tm := stopwatch.Start()

		r, _ := regexp.Compile(`.*\.\w+$`)
		if !r.MatchString(path) {
			return c.String(404, "Not Found")
		}

		extR, _ := regexp.Compile(`\.\w+$`)
		extension := strings.TrimPrefix(extR.FindString(path), ".")

		if extension == "jpg" {
			extension = "jpeg"
		}

		var contentType string
		switch extension {
		case "jpeg":
			contentType = "image/jpeg"
		case "png":
			contentType = "image/png"
		case "gif":
			contentType = "image/gif"
		case "webp":
			contentType = "image/webp"
		case "svg":
			contentType = "image/svg+xml"
		case "bmp":
			contentType = "image/bmp"
		case "ico":
			contentType = "image/vnd.microsoft.icon"
		case "json":
			contentType = "application/json"
		case "xml":
			contentType = "application/xml"
		case "pdf":
			contentType = "application/pdf"
		case "txt":
			contentType = "text/plain"
		default:
			contentType = "application/octet-stream"
		}


		bucketName := os.Getenv("BUCKET_NAME")
		rc, err := client.Bucket(bucketName).Object(fmt.Sprintf("%s/%s", c.Param("dir"), c.Param("path"))).NewReader(c.Request().Context())

		if err != nil {
			return c.String(404, "Not Found")
		}
		ls, err := io.ReadAll(rc)
		if err != nil {
			return c.String(404, "Not Found")
		}

		log.Printf("Served %s in %s", path, tm.Stop().Milliseconds())
		return c.Blob(200, contentType, ls)
	})

	log.Fatal(e.Start(fmt.Sprintf(":8080")))
}

FROM golang:1.20.13

WORKDIR /go/src/app

COPY ./go.mod /go/src/app
COPY ./go.sum /go/src/app
COPY ./src /go/src/app/src
COPY run.sh /go/src/app

ENV MOUNT_DIR /go/src/app/gcs

RUN go mod tidy
EXPOSE 8080

CMD ["go", "run", "src/main.go"]

version: '3.8'

services:
  webapp:
    build: .
    ports:
      - "8080:8080"
    environment:
      - BUCKET_NAME=[BUCKET_NAME]
      - GOOGLE_APPLICATION_CREDENTIALS=/app/src/go/mount/XXXX.json
    volumes:
        - ./mount:/app/src/go/mount

FROM golang:1.20.13-bullseye

WORKDIR /go/src/app

COPY ./go.mod /go/src/app
COPY ./go.sum /go/src/app
COPY ./src /go/src/app/src

RUN go mod download
RUN go mod tidy
RUN go build -o main ./src

EXPOSE 8080

CMD ["./main"]

$ gcloud run deploy cdnservice \
--image us-central1-docker.pkg.dev/[PROJECT_ID]/cloudrun-sample/cloudrun-image:tag1 \
--platform=managed \
--project=[PROJECT_ID] \
--region=asia-northeast1 \
--service-account [サービスアカウント]@[PROJECT_ID].iam.gserviceaccount.com \
--update-env-vars BUCKET_NAME=<バケット名> \
--allow-unauthenticated \ #追加
--ingress=internal-and-cloud-load-balancing #追加