Add sync => go-sync

sync/task/local/local.go

@@ -0,0 +1,59 @@
+// Package local provides a local task runner
+package local
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/micro/go-micro/sync/task"
+)
+
+type localTask struct {
+	opts   task.Options
+	mtx    sync.RWMutex
+	status string
+}
+
+func (l *localTask) Run(t task.Command) error {
+	ch := make(chan error, l.opts.Pool)
+
+	for i := 0; i < l.opts.Pool; i++ {
+		go func() {
+			ch <- t.Execute()
+		}()
+	}
+
+	var err error
+
+	for i := 0; i < l.opts.Pool; i++ {
+		er := <-ch
+		if err != nil {
+			err = er
+			l.mtx.Lock()
+			l.status = fmt.Sprintf("command [%s] status: %s", t.Name, err.Error())
+			l.mtx.Unlock()
+		}
+	}
+
+	close(ch)
+	return err
+}
+
+func (l *localTask) Status() string {
+	l.mtx.RLock()
+	defer l.mtx.RUnlock()
+	return l.status
+}
+
+func NewTask(opts ...task.Option) task.Task {
+	var options task.Options
+	for _, o := range opts {
+		o(&options)
+	}
+	if options.Pool == 0 {
+		options.Pool = 1
+	}
+	return &localTask{
+		opts: options,
+	}
+}