feat: add errno

internal/pkg/core/core.go

@@ -0,0 +1,51 @@
+// MIT License
+//
+// Copyright (c) 2024 vinchent <vinchent@vinchent.xyz>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package core
+
+import (
+	"net/http"
+
+	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/errno"
+	"github.com/gin-gonic/gin"
+)
+
+type ErrResponse struct {
+	Code    string `json:"code"`
+	Message string `json:"message"`
+}
+
+// WriteResponse writes the response to the HTTP response writer with HTTP code
+// and potential errors.
+func WriteResponse(c *gin.Context, err error, data any) {
+	// No error, write json response directly
+	if err == nil {
+		c.JSON(http.StatusOK, data)
+		return
+	}
+
+	error := errno.Decode(err)
+	c.JSON(error.HTTP, ErrResponse{
+		Code:    error.Code,
+		Message: error.Message,
+	})
+}