feat(stacks): support compose v2.0 stack (#1963)

api/http/error/error.go

@@ -6,18 +6,36 @@ import (
 	"net/http"
 )
 
-// errorResponse is a generic response for sending a error.
-type errorResponse struct {
-	Err string `json:"err,omitempty"`
-}
-
-// WriteErrorResponse writes an error message to the response and logger.
-func WriteErrorResponse(w http.ResponseWriter, err error, code int, logger *log.Logger) {
-	if logger != nil {
-		logger.Printf("http error: %s (code=%d)", err, code)
+type (
+	// LoggerHandler defines a HTTP handler that includes a HandlerError return pointer
+	LoggerHandler func(http.ResponseWriter, *http.Request) *HandlerError
+	// HandlerError represents an error raised inside a HTTP handler
+	HandlerError struct {
+		StatusCode int
+		Message    string
+		Err        error
 	}
+	errorResponse struct {
+		Err string `json:"err,omitempty"`
+	}
+)
 
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(code)
-	json.NewEncoder(w).Encode(&errorResponse{Err: err.Error()})
+func (handler LoggerHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
+	err := handler(rw, r)
+	if err != nil {
+		writeErrorResponse(rw, err)
+	}
+}
+
+func writeErrorResponse(rw http.ResponseWriter, err *HandlerError) {
+	log.Printf("http error: %s (err=%s) (code=%d)\n", err.Message, err.Err, err.StatusCode)
+	rw.Header().Set("Content-Type", "application/json")
+	rw.WriteHeader(err.StatusCode)
+	json.NewEncoder(rw).Encode(&errorResponse{Err: err.Message})
+}
+
+// WriteError is a convenience function that creates a new HandlerError before calling writeErrorResponse.
+// For use outside of the standard http handlers.
+func WriteError(rw http.ResponseWriter, code int, message string, err error) {
+	writeErrorResponse(rw, &HandlerError{code, message, err})
 }