补充实现细节

pkg/utils/cache.go

@@ -2,12 +2,13 @@ package utils
 
 import (
 	"bytes"
-	"errors"
 	"io"
 	"os"
 	"strings"
 	"sync"
 	"time"
+
+	"github.com/pkg/errors"
 )
 
 type CacheContent struct {

pkg/utils/error.go

@@ -0,0 +1,7 @@
+package utils
+
+import "github.com/pkg/errors"
+
+type StackTracer interface {
+	StackTrace() errors.StackTrace
+}