wip refactoring: better logging and error systems

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

@@ -0,0 +1,41 @@
+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"
+	"github.com/thecodingmachine/gotenberg/internal/pkg/config"
+	"github.com/thecodingmachine/gotenberg/internal/pkg/logger"
+	"github.com/thecodingmachine/gotenberg/internal/pkg/random"
+)
+
+// Context helps extending the default echo.Context with
+// our custom context.
+func Context(config *config.Config) echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			// generate a unique identifier for the request.
+			trace := random.Get()
+			// create the logger for this request using
+			// the previous identifier as trace.
+			logger := logger.New(config.LogLevel(), trace)
+			// extend the current echo context with our custom
+			// context.
+			ctx := context.New(c, logger, config)
+			// if its an healthcheck request, there
+			// is no resource associated to it.
+			if ctx.Path() == handler.PingEndpoint {
+				return next(ctx)
+			}
+			// if the endpoint is not for healthcheck, associate a
+			// resource to our custom context.
+			if err := ctx.WithResource(trace); err != nil {
+				// required to have a correct status code
+				// in the logs.
+				ctx.Error(err)
+				return ctx.LogRequestResult(err, false)
+			}
+			return next(ctx)
+		}
+	}
+}