Let's get rid of ugly statik (#2255)

* Get rid of ugly statik

go1.16 introduced the embed package, it's the more graceful solution for embedding file into binary.
https://golang.org/pkg/embed/

* remove statik totally

* split go and static files in assets

Makefile

@@ -12,9 +12,6 @@ file:
 	rm -rf ./assets/frpc/static/*
 	cp -rf ./web/frps/dist/* ./assets/frps/static
 	cp -rf ./web/frpc/dist/* ./assets/frpc/static
-	rm -rf ./assets/frps/statik
-	rm -rf ./assets/frpc/statik
-	go generate ./assets/...
 
 fmt:
 	go fmt ./...

assets/assets.go

@@ -14,22 +14,15 @@
 
 package assets
 
-//go:generate statik -src=./frps/static -dest=./frps
-//go:generate statik -src=./frpc/static -dest=./frpc
-//go:generate go fmt ./frps/statik/statik.go
-//go:generate go fmt ./frpc/statik/statik.go
-
 import (
-	"io/ioutil"
+	"io/fs"
 	"net/http"
-	"os"
-	"path"
-
-	"github.com/rakyll/statik/fs"
 )
 
 var (
-	// store static files in memory by statik
+	// read-only filesystem created by "embed" for embedded files
+	content fs.FS
+
 	FileSystem http.FileSystem
 
 	// if prefix is not empty, we get file content from disk
@@ -38,40 +31,18 @@ var (
 
 // if path is empty, load assets in memory
 // or set FileSystem using disk files
-func Load(path string) (err error) {
+func Load(path string) {
 	prefixPath = path
 	if prefixPath != "" {
 		FileSystem = http.Dir(prefixPath)
-		return nil
 	} else {
-		FileSystem, err = fs.New()
+		FileSystem = http.FS(content)
 	}
-	return err
 }
 
-func ReadFile(file string) (content string, err error) {
-	if prefixPath == "" {
-		file, err := FileSystem.Open(path.Join("/", file))
-		if err != nil {
-			return content, err
+func Register(fileSystem fs.FS) {
+	subFs, err := fs.Sub(fileSystem, "static")
+	if err == nil {
+		content = subFs
 	}
-		defer file.Close()
-		buf, err := ioutil.ReadAll(file)
-		if err != nil {
-			return content, err
-		}
-		content = string(buf)
-	} else {
-		file, err := os.Open(path.Join(prefixPath, file))
-		if err != nil {
-			return content, err
-		}
-		defer file.Close()
-		buf, err := ioutil.ReadAll(file)
-		if err != nil {
-			return content, err
-		}
-		content = string(buf)
-	}
-	return content, err
 }

assets/frpc/embed.go

@@ -0,0 +1,14 @@
+package frpc
+
+import (
+	"embed"
+
+	"github.com/fatedier/frp/assets"
+)
+
+//go:embed static/*
+var content embed.FS
+
+func init() {
+	assets.Register(content)
+}

assets/frps/embed.go

@@ -0,0 +1,14 @@
+package frpc
+
+import (
+	"embed"
+
+	"github.com/fatedier/frp/assets"
+)
+
+//go:embed static/*
+var content embed.FS
+
+func init() {
+	assets.Register(content)
+}

client/service.go

@@ -124,13 +124,10 @@ func (svr *Service) Run() error {
 
 	if svr.cfg.AdminPort != 0 {
 		// Init admin server assets
-		err := assets.Load(svr.cfg.AssetsDir)
-		if err != nil {
-			return fmt.Errorf("Load assets error: %v", err)
-		}
+		assets.Load(svr.cfg.AssetsDir)
 
 		address := net.JoinHostPort(svr.cfg.AdminAddr, strconv.Itoa(svr.cfg.AdminPort))
-		err = svr.RunAdminServer(address)
+		err := svr.RunAdminServer(address)
 		if err != nil {
 			log.Warn("run admin server error: %v", err)
 		}

cmd/frpc/main.go

@@ -18,7 +18,7 @@ import (
 	"math/rand"
 	"time"
 
-	_ "github.com/fatedier/frp/assets/frpc/statik"
+	_ "github.com/fatedier/frp/assets/frpc"
 	"github.com/fatedier/frp/cmd/frpc/sub"
 
 	"github.com/fatedier/golib/crypto"

cmd/frps/main.go

@@ -20,7 +20,7 @@ import (
 
 	"github.com/fatedier/golib/crypto"
 
-	_ "github.com/fatedier/frp/assets/frps/statik"
+	_ "github.com/fatedier/frp/assets/frps"
 	_ "github.com/fatedier/frp/pkg/metrics"
 )
 

go.mod

@@ -21,7 +21,6 @@ require (
 	github.com/pires/go-proxyproto v0.5.0
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
 	github.com/prometheus/client_golang v1.11.0
-	github.com/rakyll/statik v0.1.1
 	github.com/rodaine/table v1.0.1
 	github.com/spf13/cobra v1.1.3
 	github.com/stretchr/testify v1.7.0

go.sum

@@ -332,8 +332,6 @@ github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4O
 github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
 github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
-github.com/rakyll/statik v0.1.1 h1:fCLHsIMajHqD5RKigbFXpvX3dN7c80Pm12+NCrI3kvg=
-github.com/rakyll/statik v0.1.1/go.mod h1:OEi9wJV/fMUAGx1eNjq75DKDsJVuEv1U0oYdX6GX8Zs=
 github.com/rodaine/table v1.0.1 h1:U/VwCnUxlVYxw8+NJiLIuCxA/xa6jL38MY3FYysVWWQ=
 github.com/rodaine/table v1.0.1/go.mod h1:UVEtfBsflpeEcD56nF4F5AocNFta0ZuolpSVdPtlmP4=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=

server/service.go

@@ -280,11 +280,7 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 	// Create dashboard web server.
 	if cfg.DashboardPort > 0 {
 		// Init dashboard assets
-		err = assets.Load(cfg.AssetsDir)
-		if err != nil {
-			err = fmt.Errorf("Load assets error: %v", err)
-			return
-		}
+		assets.Load(cfg.AssetsDir)
 
 		address := net.JoinHostPort(cfg.DashboardAddr, strconv.Itoa(cfg.DashboardPort))
 		err = svr.RunDashboardServer(address)