add error code string representation to QuicError.Error

errorcodes/error_codes.go

@@ -6,6 +6,8 @@ package errorcodes
 type ErrorCode uint32
 
 // The error codes defined by QUIC
+// Remeber to run go generate ./... whenever the error codes change.
+//go:generate stringer -type=ErrorCode
 const (
 	InternalError      ErrorCode = 1
 	InvalidFrameData   ErrorCode = 4

errorcodes/errorcode_string.go

@@ -0,0 +1,38 @@
+// Code generated by "stringer -type=ErrorCode"; DO NOT EDIT
+
+package errorcodes
+
+import "fmt"
+
+const (
+	_ErrorCode_name_0 = "InternalError"
+	_ErrorCode_name_1 = "InvalidFrameData"
+	_ErrorCode_name_2 = "DecryptionFailure"
+	_ErrorCode_name_3 = "PeerGoingAway"
+	_ErrorCode_name_4 = "NetworkIdleTimeout"
+)
+
+var (
+	_ErrorCode_index_0 = [...]uint8{0, 13}
+	_ErrorCode_index_1 = [...]uint8{0, 16}
+	_ErrorCode_index_2 = [...]uint8{0, 17}
+	_ErrorCode_index_3 = [...]uint8{0, 13}
+	_ErrorCode_index_4 = [...]uint8{0, 18}
+)
+
+func (i ErrorCode) String() string {
+	switch {
+	case i == 1:
+		return _ErrorCode_name_0
+	case i == 4:
+		return _ErrorCode_name_1
+	case i == 12:
+		return _ErrorCode_name_2
+	case i == 16:
+		return _ErrorCode_name_3
+	case i == 25:
+		return _ErrorCode_name_4
+	default:
+		return fmt.Sprintf("ErrorCode(%d)", i)
+	}
+}