fix: change tape error

tools/context.go

@@ -0,0 +1,42 @@
+package tools
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+type noTimeout struct {
+	ctx context.Context
+}
+
+func (c noTimeout) Deadline() (time.Time, bool)       { return time.Time{}, false }
+func (c noTimeout) Done() <-chan struct{}             { return nil }
+func (c noTimeout) Err() error                        { return nil }
+func (c noTimeout) Value(key interface{}) interface{} { return c.ctx.Value(key) }
+
+// WithoutCancel returns a context that is never canceled.
+func WithoutTimeout(ctx context.Context) context.Context {
+	return noTimeout{ctx: ctx}
+}
+
+var (
+	ShutdownContext context.Context
+)
+
+func init() {
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
+
+	bgctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		oscall := <-c
+		log.Printf("system call: %+v", oscall)
+		cancel()
+	}()
+
+	ShutdownContext = bgctx
+}

tools/error.go

@@ -0,0 +1,12 @@
+package tools
+
+import (
+	"github.com/hashicorp/go-multierror"
+)
+
+func AppendError(err, e error) error {
+	if err != nil {
+		return multierror.Append(err, e)
+	}
+	return e
+}

tools/working.go

@@ -0,0 +1,19 @@
+package tools
+
+import "sync"
+
+var (
+	wg sync.WaitGroup
+)
+
+func Working() {
+	wg.Add(1)
+}
+
+func Done() {
+	wg.Done()
+}
+
+func Wait() {
+	wg.Wait()
+}