add go1.16 embed feature recipe

pyros2097 · aldas · commit 3dafe29e02eb · 2021-02-28T00:09:54.000+02:00
diff --git a/cookbook/embed/app/index.html b/cookbook/embed/app/index.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8">
+        <title>go embed Example</title>
+        <script src="/static/main.js" charset="utf-8"></script>
+    </head>
+    <body>
+        <h1>go embed Example</h1>
+    </body>
+</html>
diff --git a/cookbook/embed/app/main.js b/cookbook/embed/app/main.js
@@ -0,0 +1 @@
+alert("main.js");
diff --git a/cookbook/embed/server.go b/cookbook/embed/server.go
@@ -0,0 +1,38 @@
+package main
+
+import (
+	"embed"
+	"io/fs"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/labstack/echo/v4"
+)
+
+//go:embed app
+var embededFiles embed.FS
+
+func getFileSystem(useOS bool) http.FileSystem {
+	if useOS {
+		log.Print("using live mode")
+		return http.FS(os.DirFS("app"))
+	}
+
+	log.Print("using embed mode")
+	fsys, err := fs.Sub(embededFiles, "app")
+	if err != nil {
+		panic(err)
+	}
+
+	return http.FS(fsys)
+}
+
+func main() {
+	e := echo.New()
+	useOS := len(os.Args) > 1 && os.Args[1] == "live"
+	assetHandler := http.FileServer(getFileSystem(useOS))
+	e.GET("/", echo.WrapHandler(assetHandler))
+	e.GET("/static/*", echo.WrapHandler(http.StripPrefix("/static/", assetHandler)))
+	e.Logger.Fatal(e.Start(":1323"))
+}
diff --git a/website/content/cookbook/embed-resources.md b/website/content/cookbook/embed-resources.md
@@ -14,6 +14,14 @@ description = "Embed resources recipe for Echo"
 
 ## [Source Code]({{< source "embed-resources" >}})
 
+## With go 1.16 embed feature
+
+`server.go`
+
+{{< embed "embed/server.go" >}}
+
+## [Source Code]({{< source "embed" >}})
+
 ## Maintainers
 
 - [caarlos0](https://github.com/caarlos0)
