add docker support

.gitignore

@@ -1 +1,4 @@
 goproxy
+build/*
+go_repos/*
+.idea/*

Dockerfile

@@ -0,0 +1,8 @@
+FROM golang:1.11
+
+COPY ./ /goproxy
+WORKDIR /goproxy
+RUN go build
+
+CMD ["/goproxy/goproxy","-listen=0.0.0.0:8080"]
+

README.md

@@ -10,3 +10,17 @@ A global proxy for go modules. see: [https://goproxy.io](https://goproxy.io)
 ## Started
     
     ./goproxy -listen=0.0.0.0:80
+
+## Docker
+
+    docker run -it goproxyio/goproxy
+
+Use the -v flag to persisting the proxy module data (change ___go_repo___ to your own dir):
+
+    docker run -it -v go_repo:/go/pkg/mod/cache/download goproxyio/goproxy
+
+## Docker Compose
+
+    docker-compose up
+
+

docker-compose.yaml

@@ -0,0 +1,10 @@
+version: "3"
+services:
+
+  goproxy:
+    image: goproxyio/goproxy:latest
+    ports:
+    - "8080"
+    restart: always
+    volumes:
+      - ./go_repos:/go/pkg/mod/cache/download

main.go

@@ -28,8 +28,13 @@ func main() {
 	if gpEnv == "" {
 		panic("can not find $GOPATH")
 	}
+	fmt.Fprintf(os.Stdout, "goproxy: %s inited.\n", time.Now().Format("2006-01-02 15:04:05"))
 	gp := filepath.SplitList(gpEnv)
 	cacheDir = filepath.Join(gp[0], "pkg", "mod", "cache", "download")
+	if _, err := os.Stat(cacheDir); os.IsNotExist(err) {
+		fmt.Fprintf(os.Stdout, "goproxy: %s cache dir is not exist. %s\n", time.Now().Format("2006-01-02 15:04:05"), cacheDir)
+		os.MkdirAll(cacheDir, 0644)
+	}
 	http.Handle("/", mainHandler(http.FileServer(http.Dir(cacheDir))))
 	err := http.ListenAndServe(listen, nil)
 	if nil != err {