add stackerr for stack traces

pkg/stackerr/stackerr.go

@@ -0,0 +1,36 @@
+package stackerr
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+type StackErr struct {
+	cause error
+	stack []byte
+}
+
+func NewStackErr(cause error) error {
+	return StackErr{
+		cause: cause,
+		stack: debug.Stack(),
+	}
+}
+
+func NewStackErrf(cause error, f string, args ...any) error {
+	msg := fmt.Sprintf(f, args...)
+	cause = fmt.Errorf(msg+": %w", cause)
+	return NewStackErr(cause)
+}
+
+func (se StackErr) Error() string {
+	return se.cause.Error()
+}
+
+func (se StackErr) Unwrap() error {
+	return se.cause
+}
+
+func (se StackErr) Stack() []byte {
+	return se.stack
+}