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watch.go
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watch.go
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package task
import (
"context"
"fmt"
"os"
"os/signal"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/radovskyb/watcher"
"github.com/siggimoo/task/v3/internal/logger"
"github.com/siggimoo/task/v3/internal/status"
"github.com/siggimoo/task/v3/taskfile"
)
const watchInterval = 5 * time.Second
// watchTasks start watching the given tasks
func (e *Executor) watchTasks(calls ...taskfile.Call) error {
tasks := make([]string, len(calls))
for i, c := range calls {
tasks[i] = c.Task
}
e.Logger.Errf(logger.Green, "task: Started watching for tasks: %s", strings.Join(tasks, ", "))
ctx, cancel := context.WithCancel(context.Background())
for _, c := range calls {
c := c
go func() {
if err := e.RunTask(ctx, c); err != nil && !isContextError(err) {
e.Logger.Errf(logger.Red, "%v", err)
}
}()
}
w := watcher.New()
defer w.Close()
w.SetMaxEvents(1)
closeOnInterrupt(w)
go func() {
for {
select {
case event := <-w.Event:
e.Logger.VerboseErrf(logger.Magenta, "task: received watch event: %v", event)
cancel()
ctx, cancel = context.WithCancel(context.Background())
e.Compiler.ResetCache()
for _, c := range calls {
c := c
go func() {
if err := e.RunTask(ctx, c); err != nil && !isContextError(err) {
e.Logger.Errf(logger.Red, "%v", err)
}
}()
}
case err := <-w.Error:
switch err {
case watcher.ErrWatchedFileDeleted:
default:
e.Logger.Errf(logger.Red, "%v", err)
}
case <-w.Closed:
cancel()
return
}
}
}()
go func() {
// re-register every 5 seconds because we can have new files, but this process is expensive to run
for {
if err := e.registerWatchedFiles(w, calls...); err != nil {
e.Logger.Errf(logger.Red, "%v", err)
}
time.Sleep(watchInterval)
}
}()
return w.Start(watchInterval)
}
func isContextError(err error) bool {
if taskRunErr, ok := err.(*taskRunError); ok {
err = taskRunErr.err
}
return err == context.Canceled || err == context.DeadlineExceeded
}
func closeOnInterrupt(w *watcher.Watcher) {
ch := make(chan os.Signal, 1)
signal.Notify(ch, os.Interrupt, os.Kill, syscall.SIGTERM)
go func() {
<-ch
w.Close()
}()
}
func (e *Executor) registerWatchedFiles(w *watcher.Watcher, calls ...taskfile.Call) error {
watchedFiles := w.WatchedFiles()
var registerTaskFiles func(taskfile.Call) error
registerTaskFiles = func(c taskfile.Call) error {
task, err := e.CompiledTask(c)
if err != nil {
return err
}
for _, d := range task.Deps {
if err := registerTaskFiles(taskfile.Call{Task: d.Task, Vars: d.Vars}); err != nil {
return err
}
}
for _, c := range task.Cmds {
if c.Task != "" {
if err := registerTaskFiles(taskfile.Call{Task: c.Task, Vars: c.Vars}); err != nil {
return err
}
}
}
for _, s := range task.Sources {
files, err := status.Glob(task.Dir, s)
if err != nil {
return fmt.Errorf("task: %s: %w", s, err)
}
for _, f := range files {
absFile, err := filepath.Abs(f)
if err != nil {
return err
}
if shouldIgnoreFile(absFile) {
continue
}
if _, ok := watchedFiles[absFile]; ok {
continue
}
if err := w.Add(absFile); err != nil {
return err
}
e.Logger.VerboseOutf(logger.Green, "task: watching new file: %v", absFile)
}
}
return nil
}
for _, c := range calls {
if err := registerTaskFiles(c); err != nil {
return err
}
}
return nil
}
func shouldIgnoreFile(path string) bool {
return strings.Contains(path, "/.git") || strings.Contains(path, "/.task") || strings.Contains(path, "/node_modules")
}