go-zero 文件服务

go-zero本身支持文件服务,但是我们需要写相关的handler文件,本文目的在于

  • 不写任何一个和文件相关的handler

  • 如果有新的文件,直接把文件模板到某个特定目录就好,不要动任何go代码

需求在这里,开撸吧

在代码开始前,你可能需要阅读

golang微服务框架go-zero系列-1:在go-zero中使用XormV2
golang微服务框架go-zero系列-2:在go-zero中使用jwt-token鉴权实践
golang微服务框架go-zero系列-3:扩展go-zero,使之支持html模板解析自动化

注意

微服务讲究资源分离,实际生产过程中尽量使用专业的文件服务器或者OSS等第三方存储平台

file服务实现思路 
ginstatic filego-zerogo-zero/asset/l1.jpg/asset/:1/asset/l1/l2.jpg/asset/:1/:2

映射指定路径到单个文件

favourite.ico./www/favourite.ico
//处理函数,传入文件地址
func filehandler(filepath string) http.HandlerFunc {
	return func(w http.ResponseWriter, req *http.Request) {
		http.ServeFile(w, req, filepath)
	}
}
AddRoute
func RegisterHandlers(engine *rest.Server, serverCtx *svc.ServiceContext) {

//这里直接添加单个
engine.AddRoute(
				rest.Route{
					Method:  http.MethodGet,
					Path:    "/favourite.ico",
					Handler: filehandler("./www/favourite.ico"),
				})
}

映射指定目录并提供服务

/assets/cssjsimg
tree /f
+---assets|   +---css|   +---fonts|   +---images|   +---js|   \---plugins|       +---font-awesome|       |   +---css|       |   \---fonts|       +---fontawesome|       |   +---css|       |   \---fonts|       +---ionicons|       |   +---css|       |   \---fonts|       +---jquery.contextmenu|       |   \---images|       +---jquery.pin|       |   +---css|       |   \---images|       +---jqueryui-1.12.1|       |   +---external|       |   |   \---jquery|       |   \---images|       \---swiper-4.5.3|           +---css|           \---js

如果使用单个文件的方式来实现,肯定不合理,因为router会非常大,怎么解决这个问题?我们可以使用如下方法实现文件夹服务

//
func dirhandler(patern, filedir string) http.HandlerFunc {

	return func(w http.ResponseWriter, req *http.Request) {
		handler := http.StripPrefix(patern, http.FileServer(http.Dir(filedir)))
		handler.ServeHTTP(w, req)

	}
}
http.StripPrefix(patern, http.FileServer(http.Dir(filedir)))paternfiledir
/assets/:1/assets/:1/:2./assets/
dirhandler
func RegisterHandlers(engine *rest.Server, serverCtx *svc.ServiceContext) {

			//这里注册
			dirlevel := []string{":1", ":2", ":3", ":4", ":5", ":6", ":7", ":8"}
			patern := "/asset/"
			dirpath := "./assets/"
			for i := 1; i < len(dirlevel); i++ {
				path := prefix + strings.Join(dirlevel[:i], "/")
				//最后生成 /asset
				engine.AddRoute(
					rest.Route{
						Method:  http.MethodGet,
						Path:    path,
						Handler: dirhandler(patern,dirpath),
					})

				logx.Infof("register dir  %s  %s", path,dirpath)
			}
}

404

404可以在main函数中配置

rt := router.NewPatRouter()
	rt.SetNotFoundHandler(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		//这里内容可以定制
		w.Write([]byte("服务器开小差了,这里可定制"))
	}))
	server := rest.MustNewServer(c.RestConf, rest.WithRouter(rt))
http://127.0.0.1:8888/hello服务器开小差了,这里可定制

测试

启动系统后运行

E:\workspace@go\gozero\file>go run file.go
2020/09/05 20:18:24 {"@timestamp":"2020-09-05T20:18:24.682+08","level":"info","content":"{{{file-api { console logs info false 0 100} pro  { 0 }} 0.0.0.0 8081 false 10000 1048576 3000 900 {false 0s []}} [/asset/=./assets]}"}
{"@timestamp":"2020-09-05T20:18:24.682+08","level":"info","content":"register dir  /asset/:1  ./assets"}
{"@timestamp":"2020-09-05T20:18:24.683+08","level":"info","content":"register dir  /asset/:1/:2  ./assets"}
{"@timestamp":"2020-09-05T20:18:24.683+08","level":"info","content":"register dir  /asset/:1/:2/:3  ./assets"}
{"@timestamp":"2020-09-05T20:18:24.683+08","level":"info","content":"register dir  /asset/:1/:2/:3/:4  ./assets"}
{"@timestamp":"2020-09-05T20:18:24.697+08","level":"info","content":"register dir  /asset/:1/:2/:3/:4/:5  ./assets"}
{"@timestamp":"2020-09-05T20:18:24.697+08","level":"info","content":"register dir  /asset/:1/:2/:3/:4/:5/:6  ./assets"}
{"@timestamp":"2020-09-05T20:18:24.698+08","level":"info","content":"register dir  /asset/:1/:2/:3/:4/:5/:6/:7  ./assets"}

访问系统都能正常响应

http://127.0.0.1:8888/asset/images/avatar.jpghttp://127.0.0.1:8888/asset/js/test.jshttp://127.0.0.1:8888/asset/js/lv2/test.js
/asset/**/assets/**

思考一下

我们可以在NotFoundHandler中根据req.URL.path来实现文件服务,如何实现呢?

本文代码获取 
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效果杠杠的3d7b0115ed7dd868d72e7a86f3152e7e.png

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