feat: add XError to support more contextual error handling

xerror/stack.go

@@ -16,7 +16,26 @@ import (
 type Stack struct {
 	Func string `json:"func"`
 	File string `json:"file"`
-	Line string `json:"line"`
+	Line int    `json:"line"`
+}
+
+// Stacks returns stack trace array generated by pkg/errors
+func (e *XError) Stacks() []*Stack {
+	resp := make([]*Stack, len(*e.stack))
+	for i, st := range *e.stack {
+		f := frame(st)
+		resp[i] = &Stack{
+			Func: f.name(),
+			File: f.file(),
+			Line: f.line(),
+		}
+	}
+	return resp
+}
+
+// StackTrace returns stack trace which is compatible with pkg/errors
+func (e *XError) StackTrace() StackTrace {
+	return e.stack.StackTrace()
 }
 
 // ---------------------------------------