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Echo

Embed Resources

Go’s embed package (Go 1.16+) lets you compile static assets directly into the binary, so a single executable can ship with its frontend. This recipe serves the embedded filesystem through Echo, with an optional live mode that reads from disk during development.

Server

Section titled “Server”
package main


import (
  "context"
  "embed"
  "io/fs"
  "log"
  "net/http"
  "os"


  "github.com/labstack/echo/v5"
)


//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)))


  sc := echo.StartConfig{Address: ":1323"}
  if err := sc.Start(context.Background(), e); err != nil {
    e.Logger.Error("failed to start server", "error", err)
  }
}