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main.go
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main.go
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package main
import (
"bufio"
"context"
"errors"
"fmt"
"log"
"os"
"os/exec"
"os/signal"
"path/filepath"
"runtime"
"strings"
"sync"
"syscall"
"time"
"github.com/mattn/go-shellwords"
"github.com/urfave/cli/v2"
"github.com/acoshift/goreload/internal"
)
var (
logger = log.New(os.Stdout, "[goreload] ", 0)
colorGreen = string([]byte{27, 91, 57, 55, 59, 51, 50, 59, 49, 109})
colorYellow = string([]byte{27, 91, 57, 55, 59, 51, 51, 59, 49, 109})
colorRed = string([]byte{27, 91, 57, 55, 59, 51, 49, 59, 49, 109})
colorReset = string([]byte{27, 91, 48, 109})
)
func main() {
app := cli.NewApp()
app.Name = "goreload"
app.Usage = "A live reload utility for Go web applications."
app.Action = mainAction
app.Flags = []cli.Flag{
&cli.StringFlag{
Name: "bin",
Aliases: []string{"b"},
Value: ".goreload",
Usage: "name of generated binary file",
},
&cli.StringFlag{
Name: "path",
Aliases: []string{"t"},
Value: ".",
Usage: "Path to watch files from",
},
&cli.StringFlag{
Name: "build",
Aliases: []string{"d"},
Value: "",
Usage: "Path to build files from (defaults to same value as --path)",
},
&cli.StringSliceFlag{
Name: "excludeDir",
Aliases: []string{"x"},
Value: &cli.StringSlice{},
Usage: "Relative directories to exclude",
},
&cli.BoolFlag{
Name: "all",
Usage: "reloads whenever any file changes, as opposed to reloading only on .go file change",
},
&cli.StringFlag{
Name: "buildArgs",
Usage: "Additional go build arguments",
},
&cli.StringFlag{
Name: "logPrefix",
Usage: "Log prefix",
Value: "goreload",
},
}
app.Commands = []*cli.Command{
{
Name: "run",
Aliases: []string{"r"},
Usage: "Run the goreload",
Action: mainAction,
},
}
if err := app.Run(os.Args); err != nil {
logger.Fatal(err)
}
}
func mainAction(c *cli.Context) error {
logger.SetPrefix(fmt.Sprintf("[%s] ", c.String("logPrefix")))
all := c.Bool("all")
wd, err := os.Getwd()
if err != nil {
logger.Fatal(err)
return err
}
buildArgs, err := shellwords.Parse(c.String("buildArgs"))
if err != nil {
return err
}
buildPath := c.String("build")
if buildPath == "" {
buildPath = c.String("path")
}
builder := internal.NewBuilder(buildPath, c.String("bin"), wd, buildArgs)
runner := internal.NewRunner(filepath.Join(wd, builder.Binary()), c.Args().Slice()...)
runner.SetWriter(os.Stdout)
shutdown(runner)
ctx, cancel := context.WithCancel(context.Background())
buildAndRun(ctx, builder, runner)
scanChanges(c.String("path"), c.StringSlice("excludeDir"), all, func() {
cancel()
runner.Kill()
ctx, cancel = context.WithCancel(context.Background())
go buildAndRun(ctx, builder, runner)
})
return nil
}
var lockBuildAndRun sync.Mutex
func buildAndRun(ctx context.Context, builder *internal.Builder, runner *internal.Runner) {
// allow only single buildAndRun at anytime
lockBuildAndRun.Lock()
defer lockBuildAndRun.Unlock()
logger.Println("Building...")
err := builder.Build(ctx)
if err == context.Canceled {
logger.Printf("%sBuild canceled%s\n", colorYellow, colorReset)
return
}
if err != nil {
logger.Printf("%sBuild failed%s\n", colorRed, colorReset)
fmt.Println(err)
return
}
logger.Printf("%sBuild finished%s\n", colorGreen, colorReset)
runner.Run()
}
func scanChanges(watchPath string, excludeDirs []string, allFiles bool, cb func()) {
scanChangesFswatch(watchPath, excludeDirs, allFiles, cb)
scanChangesWalk(watchPath, excludeDirs, allFiles, cb)
}
func scanChangesFswatch(watchPath string, excludeDirs []string, allFiles bool, cb func()) {
if runtime.GOOS != "darwin" {
return
}
exit := false
curDir, err := os.Getwd()
if err != nil {
return
}
curDir += "/"
debouncedCallback := newDebounce(cb, 100*time.Millisecond)
// always retry when fswatch exit
for {
func() {
cmd := exec.Command("fswatch",
"-r",
"--event=Created",
"--event=Updated",
"--event=Removed",
watchPath,
)
p, err := cmd.StdoutPipe()
if err != nil {
return
}
err = cmd.Start()
if err != nil {
// fswatch not found, or can not start
exit = true
return
}
defer func() {
if cmd.Process != nil {
cmd.Process.Kill()
}
}()
r := bufio.NewReader(p)
for {
pathBytes, _, err := r.ReadLine()
if err != nil {
break
}
path := string(pathBytes)
path = strings.TrimPrefix(path, curDir)
if strings.HasPrefix(path, ".git/") {
continue
}
{
skip := false
for _, x := range excludeDirs {
if strings.HasPrefix(path, x) {
skip = true
break
}
}
if skip {
continue
}
}
if filepath.Base(path)[0] == '.' {
continue
}
if !(allFiles || filepath.Ext(path) == ".go") {
continue
}
debouncedCallback.Call()
}
}()
if exit {
return
}
time.Sleep(500 * time.Millisecond)
}
}
func scanChangesWalk(watchPath string, excludeDirs []string, allFiles bool, cb func()) {
excludeDir := make(map[string]bool)
for _, x := range excludeDirs {
excludeDir[x] = true
}
startTime := time.Now()
var errDone = errors.New("done")
for {
filepath.Walk(watchPath, func(path string, info os.FileInfo, err error) error {
if path == ".git" && info.IsDir() {
return filepath.SkipDir
}
if excludeDir[path] {
return filepath.SkipDir
}
// ignore hidden files
if filepath.Base(path)[0] == '.' {
return nil
}
if (allFiles || filepath.Ext(path) == ".go") && info.ModTime().After(startTime) {
cb()
startTime = time.Now()
return errDone
}
return nil
})
time.Sleep(500 * time.Millisecond)
}
}
func shutdown(runner *internal.Runner) {
c := make(chan os.Signal, 2)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
s := <-c
log.Println("Got signal: ", s)
err := runner.Kill()
if err != nil {
log.Print("Error killing: ", err)
}
os.Exit(1)
}()
}
type debounce struct {
mu sync.Mutex
t *time.Timer
f func()
d time.Duration
}
func newDebounce(f func(), d time.Duration) *debounce {
return &debounce{
f: f,
d: d,
}
}
func (d *debounce) Call() {
d.mu.Lock()
defer d.mu.Unlock()
if d.t == nil {
d.f()
d.t = time.AfterFunc(0, func() {})
return
}
d.t.Stop()
d.t = time.AfterFunc(d.d, d.f)
}