生命不止，繼續 go go go !!!

使用 Go 開發應用的時候，有時會遇到需要讀取靜態資源的情況。比如開發 Web 應用，程序需要加載模板文件生成輸出的 HTML。在程序部署的時候，除了發布應用可執行文件外，還需要發布依賴的靜態資源文件。這給發布過程添加了一些麻煩。既然發布單獨一個可執行文件是非常簡單的操作，就有人會想辦法把靜態資源文件打包進 Go 的程序文件中。

參考地址：
http://fuxiaohei.me/2016/10/1/go-binary-embed-asset.html

文中提到了：
go-bindata
go.rice
esc

本片博客只會介紹go.rice，其余的會之后進行介紹的。

What’s an Embedded Resource?
An embedded resource in a application is a file that is included as part of the application. The file is not compiled, but is accessable from the code at run-time. Embedded resources can be any file type.

Languages as JAVA and C# support resources out of box. However, this is not the case for Golang. In order to emebed resource, we need to develop our own solution. Thankfully, there are couple of tools that are doing this for us.

參考地址：
http://blog.ralch.com/tutorial/golang-embedded-resources/

go.rice

go.rice is a Go package that makes working with resources such as html,js,css,images,templates, etc very easy.

github地址：
https://github.com/GeertJohan/go.rice

Star: 1107

獲取：

go get github.com/GeertJohan/go.ricego get github.com/GeertJohan/go.rice/rice12

FindBox
funcation to access a particular resource bundler (directory).
The function is finding the correct absolute path for your resource files.

// find a rice.BoxtemplateBox, err := rice.FindBox("your-resource-directory")if err != nil { log.Fatal(err)}// get file contents as stringtmpl, err := templateBox.String("your_asset.tmpl")if err != nil { log.Fatal(err)}12345678910

Embedded resource as source code
作為源碼嵌入資源
命令：

rice embed-go1

生成文件：

.rice-box.go1

Embedded resource as an archive
appends a resource as a zip file to already built executable
以zip的形式附加到已經存在的可執行文件

Embedded resource as an syso resource
This is experimental method that generates .syso file that is compiled by Go compiler. The following command generates the coff syso resource files per directory:

rice embed-syso1go build -o rice append --exec 12

echo中使用go.rice

代碼main.go:

package mainimport ( "net/http" "github.com/GeertJohan/go.rice" "github.com/labstack/echo")func main() { e := echo.New() // the file server for rice. "app" is the folder where the files come from. assetHandler := http.FileServer(rice.MustFindBox("app").HTTPBox()) // serves the index.html from rice e.GET("/", echo.WrapHandler(assetHandler)) // servers other static files e.GET("/static/*", echo.WrapHandler(http.StripPrefix("/static/", assetHandler))) e.Logger.Fatal(e.Start(":1323"))}12345678910111213141516171819202122

跟main.go同一級，新建一個文件夾app，放入文件file.txt

執行：

rice embed-go1

生成了 rice-box.go：

package mainimport ( "github.com/GeertJohan/go.rice/embedded" "time")func init() { // define files file2 := &embedded.EmbeddedFile{ Filename: "file.txt", FileModTime: time.Unix(1511406219, 0), Content: string(""), } // define dirs dir1 := &embedded.EmbeddedDir{ Filename: "", DirModTime: time.Unix(1511406219, 0), ChildFiles: []*embedded.EmbeddedFile{ file2, // "file.txt" }, } // link ChildDirs dir1.ChildDirs = []*embedded.EmbeddedDir{} // register embeddedBox embedded.RegisterEmbeddedBox(`app`, &embedded.EmbeddedBox{ Name: `app`, Time: time.Unix(1511406219, 0), Dirs: map[string]*embedded.EmbeddedDir{ "": dir1, }, Files: map[string]*embedded.EmbeddedFile{ "file.txt": file2, }, })}123456789101112131415161718192021222324252627282930313233343536373839404142

執行：

go build1

生成文件：embed_resources.exe

運行embed_resources.exe
刪除app文件夾下的file.txt
瀏覽器訪問http://localhost:1323/
可以看到file.txt文件

總結

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