feat: improve err logging

apps/backend/internal/httperr/handler.go

@@ -0,0 +1,64 @@
+package httperr
+
+import (
+	"errors"
+	"log/slog"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+// ErrorHandler is a global error handler for Fiber that logs errors and returns appropriate responses.
+func ErrorHandler(c *fiber.Ctx, err error) error {
+	// Default status code
+	code := fiber.StatusInternalServerError
+	message := "Internal"
+
+	// Check if it's our custom HTTPError
+	var httpErr *HTTPError
+	if errors.As(err, &httpErr) {
+		code = httpErr.Code
+		message = httpErr.Message
+
+		// Log the error with underlying error details
+		if httpErr.Err != nil {
+			slog.Error("HTTP error",
+				"status", code,
+				"message", message,
+				"error", httpErr.Err.Error(),
+				"path", c.Path(),
+				"method", c.Method(),
+			)
+		} else {
+			slog.Warn("HTTP error",
+				"status", code,
+				"message", message,
+				"path", c.Path(),
+				"method", c.Method(),
+			)
+		}
+	} else {
+		// Check if it's a Fiber error
+		var fiberErr *fiber.Error
+		if errors.As(err, &fiberErr) {
+			code = fiberErr.Code
+			message = fiberErr.Message
+		} else {
+			// Generic error - log it
+			slog.Error("Unhandled error",
+				"status", code,
+				"error", err.Error(),
+				"path", c.Path(),
+				"method", c.Method(),
+			)
+		}
+	}
+
+	// Set Content-Type header
+	c.Set(fiber.HeaderContentType, fiber.MIMEApplicationJSONCharsetUTF8)
+
+	// Return JSON response
+	return c.Status(code).JSON(fiber.Map{
+		"error": message,
+	})
+}
+