wip refactoring: better logging and error systems

internal/app/api/pkg/middleware/logger.go

@@ -0,0 +1,21 @@
+package middleware
+
+import (
+	"github.com/labstack/echo/v4"
+	"github.com/thecodingmachine/gotenberg/internal/app/api/pkg/context"
+	"github.com/thecodingmachine/gotenberg/internal/app/api/pkg/handler"
+)
+
+// Logger helps logging the result of a request.
+func Logger() echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			ctx := context.MustCastFromEchoContext(c)
+			err := next(ctx)
+			// we do not want to log healthcheck requests if
+			// log level is not set to DEBUG.
+			isDebug := ctx.Path() == handler.PingEndpoint
+			return ctx.LogRequestResult(err, isDebug)
+		}
+	}
+}