refactor: rename domain.Error methods (Code -> Type, Slug -> Code)

api/openapi3.yml

@@ -54,11 +54,11 @@ components:
     Error:
       type: object
       required:
-        - slug
+        - code
         - message
       additionalProperties: false
       properties:
-        slug:
+        code:
           type: string
           example: length-out-of-range
         message:

internal/domain/error.go

@@ -1,30 +1,30 @@
 package domain
 
-type ErrorCode uint8
+type ErrorType uint8
 
 const (
-	ErrorCodeUnknown ErrorCode = iota
+	ErrorTypeUnknown ErrorType = iota
-	ErrorCodeNotFound
+	ErrorTypeNotFound
-	ErrorCodeIncorrectInput
+	ErrorTypeIncorrectInput
 )
 
-func (e ErrorCode) String() string {
+func (e ErrorType) String() string {
 	switch e {
-	case ErrorCodeNotFound:
+	case ErrorTypeNotFound:
-		return "not-found"
+		return "not found"
-	case ErrorCodeIncorrectInput:
+	case ErrorTypeIncorrectInput:
-		return "incorrect-input"
+		return "incorrect input"
-	case ErrorCodeUnknown:
+	case ErrorTypeUnknown:
 		fallthrough
 	default:
-		return "unknown-error"
+		return "unknown error"
 	}
 }
 
 type Error interface {
 	error
-	Code() ErrorCode
+	Type() ErrorType
-	Slug() string
+	Code() string
 }
 
 type ErrorWithParams interface {
@@ -34,8 +34,8 @@ type ErrorWithParams interface {
 
 type simpleError struct {
 	msg  string
-	code ErrorCode
+	typ  ErrorType
-	slug string
+	code string
 }
 
 var _ Error = simpleError{}
@@ -44,10 +44,10 @@ func (e simpleError) Error() string {
 	return e.msg
 }
 
-func (e simpleError) Code() ErrorCode {
+func (e simpleError) Type() ErrorType {
-	return e.code
+	return e.typ
 }
 
-func (e simpleError) Slug() string {
+func (e simpleError) Code() string {
-	return e.slug
+	return e.code
 }

internal/domain/server.go

@@ -625,11 +625,11 @@ func (e ServerNotFoundError) Error() string {
 	return fmt.Sprintf("server with key %s not found", e.Key)
 }
 
-func (e ServerNotFoundError) Code() ErrorCode {
+func (e ServerNotFoundError) Type() ErrorType {
-	return ErrorCodeNotFound
+	return ErrorTypeNotFound
 }
 
-func (e ServerNotFoundError) Slug() string {
+func (e ServerNotFoundError) Code() string {
 	return "server-not-found"
 }
 

internal/domain/validation.go

@@ -37,19 +37,19 @@ func (e ValidationError) Path() string {
 	return path
 }
 
-func (e ValidationError) Code() ErrorCode {
+func (e ValidationError) Type() ErrorType {
+	var domainErr Error
+	if errors.As(e.Err, &domainErr) {
+		return domainErr.Type()
+	}
+	return ErrorTypeIncorrectInput
+}
+
+func (e ValidationError) Code() string {
 	var domainErr Error
 	if errors.As(e.Err, &domainErr) {
 		return domainErr.Code()
 	}
-	return ErrorCodeIncorrectInput
-}
-
-func (e ValidationError) Slug() string {
-	var domainErr Error
-	if errors.As(e.Err, &domainErr) {
-		return domainErr.Slug()
-	}
 	return "validation-failed"
 }
 
@@ -97,19 +97,19 @@ func (e SliceElementValidationError) Path() string {
 	return path
 }
 
-func (e SliceElementValidationError) Code() ErrorCode {
+func (e SliceElementValidationError) Type() ErrorType {
+	var domainErr Error
+	if errors.As(e.Err, &domainErr) {
+		return domainErr.Type()
+	}
+	return ErrorTypeIncorrectInput
+}
+
+func (e SliceElementValidationError) Code() string {
 	var domainErr Error
 	if errors.As(e.Err, &domainErr) {
 		return domainErr.Code()
 	}
-	return ErrorCodeIncorrectInput
-}
-
-func (e SliceElementValidationError) Slug() string {
-	var domainErr Error
-	if errors.As(e.Err, &domainErr) {
-		return domainErr.Slug()
-	}
 	return "slice-element-validation-failed"
 }
 
@@ -136,11 +136,11 @@ func (e MinGreaterEqualError) Error() string {
 	return fmt.Sprintf("must be no less than %d (current: %d)", e.Min, e.Current)
 }
 
-func (e MinGreaterEqualError) Code() ErrorCode {
+func (e MinGreaterEqualError) Type() ErrorType {
-	return ErrorCodeIncorrectInput
+	return ErrorTypeIncorrectInput
 }
 
-func (e MinGreaterEqualError) Slug() string {
+func (e MinGreaterEqualError) Code() string {
 	return "min-greater-equal"
 }
 
@@ -162,11 +162,11 @@ func (e MaxLessEqualError) Error() string {
 	return fmt.Sprintf("must be no greater than %d (current: %d)", e.Max, e.Current)
 }
 
-func (e MaxLessEqualError) Code() ErrorCode {
+func (e MaxLessEqualError) Type() ErrorType {
-	return ErrorCodeIncorrectInput
+	return ErrorTypeIncorrectInput
 }
 
-func (e MaxLessEqualError) Slug() string {
+func (e MaxLessEqualError) Code() string {
 	return "max-less-equal"
 }
 
@@ -189,11 +189,11 @@ func (e LenOutOfRangeError) Error() string {
 	return fmt.Sprintf("length must be between %d and %d (current length: %d)", e.Min, e.Max, e.Current)
 }
 
-func (e LenOutOfRangeError) Code() ErrorCode {
+func (e LenOutOfRangeError) Type() ErrorType {
-	return ErrorCodeIncorrectInput
+	return ErrorTypeIncorrectInput
 }
 
-func (e LenOutOfRangeError) Slug() string {
+func (e LenOutOfRangeError) Code() string {
 	return "length-out-of-range"
 }
 
@@ -215,11 +215,11 @@ func (e InvalidURLError) Error() string {
 	return fmt.Sprintf("%s: invalid URL", e.URL)
 }
 
-func (e InvalidURLError) Code() ErrorCode {
+func (e InvalidURLError) Type() ErrorType {
-	return ErrorCodeIncorrectInput
+	return ErrorTypeIncorrectInput
 }
 
-func (e InvalidURLError) Slug() string {
+func (e InvalidURLError) Code() string {
 	return "invalid-url"
 }
 
@@ -231,20 +231,20 @@ func (e InvalidURLError) Params() map[string]any {
 
 var ErrRequired error = simpleError{
 	msg:  "can't be blank",
-	code: ErrorCodeIncorrectInput,
+	typ:  ErrorTypeIncorrectInput,
-	slug: "required",
+	code: "required",
 }
 
 var ErrNil error = simpleError{
 	msg:  "must not be nil",
-	code: ErrorCodeIncorrectInput,
+	typ:  ErrorTypeIncorrectInput,
-	slug: "nil",
+	code: "nil",
 }
 
 var ErrInvalidCursor error = simpleError{
 	msg:  "invalid cursor",
-	code: ErrorCodeIncorrectInput,
+	typ:  ErrorTypeIncorrectInput,
-	slug: "invalid-cursor",
+	code: "invalid-cursor",
 }
 
 func validateSliceLen[S ~[]E, E any](s S, min, max int) error {

internal/domain/version.go

@@ -328,11 +328,11 @@ func (e VersionNotFoundError) Error() string {
 	return fmt.Sprintf("version with code %s not found", e.VersionCode)
 }
 
-func (e VersionNotFoundError) Code() ErrorCode {
+func (e VersionNotFoundError) Type() ErrorType {
-	return ErrorCodeNotFound
+	return ErrorTypeNotFound
 }
 
-func (e VersionNotFoundError) Slug() string {
+func (e VersionNotFoundError) Code() string {
 	return "version-not-found"
 }
 

internal/port/handler_http_api.go

@@ -69,7 +69,7 @@ func (h *apiHTTPHandler) handleNotFound(w http.ResponseWriter, r *http.Request)
 		errors: []error{
 			apiError{
 				status:  http.StatusNotFound,
-				slug:    "route-not-found",
+				code:    "route-not-found",
 				message: "route not found",
 			},
 		},
@@ -81,7 +81,7 @@ func (h *apiHTTPHandler) handleMethodNotAllowed(w http.ResponseWriter, r *http.R
 		errors: []error{
 			apiError{
 				status:  http.StatusMethodNotAllowed,
-				slug:    "method-not-allowed",
+				code:    "method-not-allowed",
 				message: "method not allowed",
 			},
 		},

internal/port/handler_http_api_error.go

@@ -11,7 +11,7 @@ import (
 
 type apiError struct {
 	status  int
-	slug    string
+	code    string
 	path    []string
 	params  map[string]any
 	message string
@@ -28,7 +28,7 @@ func (e apiError) toResponse() apimodel.ErrorResponse {
 				Message: e.message,
 				Params:  e.params,
 				Path:    e.path,
-				Slug:    e.slug,
+				Code:    e.code,
 			},
 		},
 	}
@@ -80,7 +80,7 @@ type apiErrorRenderer struct {
 
 var errInternalServerError = apiError{
 	status:  http.StatusInternalServerError,
-	slug:    "internal-server-error",
+	code:    "internal-server-error",
 	message: "internal server error",
 }
 
@@ -97,7 +97,7 @@ func (re apiErrorRenderer) render(w http.ResponseWriter, r *http.Request) {
 		case errors.As(err, &paramFormatErr):
 			apiErr = apiError{
 				status:  http.StatusBadRequest,
-				slug:    "invalid-param-format",
+				code:    "invalid-param-format",
 				path:    []string{"$query", paramFormatErr.ParamName},
 				message: paramFormatErr.Err.Error(),
 			}
@@ -169,21 +169,21 @@ func (re apiErrorRenderer) domainErrorToAPIError(domainErr domain.Error) apiErro
 	}
 
 	return apiError{
-		status:  errorCodeToStatusCode(domainErr.Code()),
+		status:  errorTypeToStatusCode(domainErr.Type()),
-		slug:    domainErr.Slug(),
+		code:    domainErr.Code(),
 		path:    path,
 		params:  cloned,
 		message: message,
 	}
 }
 
-func errorCodeToStatusCode(code domain.ErrorCode) int {
+func errorTypeToStatusCode(code domain.ErrorType) int {
 	switch code {
-	case domain.ErrorCodeIncorrectInput:
+	case domain.ErrorTypeIncorrectInput:
 		return http.StatusBadRequest
-	case domain.ErrorCodeNotFound:
+	case domain.ErrorTypeNotFound:
 		return http.StatusNotFound
-	case domain.ErrorCodeUnknown:
+	case domain.ErrorTypeUnknown:
 		fallthrough
 	default:
 		return http.StatusInternalServerError