实现缓存策略部分管理功能

internal/errors/error.go

@@ -0,0 +1,60 @@
+package errors
+
+import (
+	"errors"
+	"path/filepath"
+	"runtime"
+	"strconv"
+)
+
+type errorObj struct {
+	err      error
+	file     string
+	line     int
+	funcName string
+}
+
+func (this *errorObj) Error() string {
+	s := this.err.Error() + "\n  " + this.file
+	if len(this.funcName) > 0 {
+		s += ":" + this.funcName + "()"
+	}
+	s += ":" + strconv.Itoa(this.line)
+	return s
+}
+
+// 新错误
+func New(errText string) error {
+	ptr, file, line, ok := runtime.Caller(1)
+	funcName := ""
+	if ok {
+		frame, _ := runtime.CallersFrames([]uintptr{ptr}).Next()
+		funcName = filepath.Base(frame.Function)
+	}
+	return &errorObj{
+		err:      errors.New(errText),
+		file:     file,
+		line:     line,
+		funcName: funcName,
+	}
+}
+
+// 包装已有错误
+func Wrap(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	ptr, file, line, ok := runtime.Caller(1)
+	funcName := ""
+	if ok {
+		frame, _ := runtime.CallersFrames([]uintptr{ptr}).Next()
+		funcName = filepath.Base(frame.Function)
+	}
+	return &errorObj{
+		err:      err,
+		file:     file,
+		line:     line,
+		funcName: funcName,
+	}
+}