add request id generator and middleware file

pkg/middlewares/request_id.go

@@ -0,0 +1,27 @@
+package middlewares
+
+import (
+	"github.com/mayswind/lab/pkg/core"
+	"github.com/mayswind/lab/pkg/requestid"
+	"github.com/mayswind/lab/pkg/settings"
+)
+
+const REQUEST_ID_HEADER = "X-Request-ID"
+
+func RequestId(config *settings.Config) core.MiddlewareHandlerFunc {
+	return func (c *core.Context) {
+		if requestid.Container.Current == nil {
+			c.Next()
+			return
+		}
+
+		requestId := requestid.Container.Current.GenerateRequestId(c.ClientIP())
+		c.SetRequestId(requestId)
+
+		if config.EnableRequestIdHeader {
+			c.Header(REQUEST_ID_HEADER, requestId)
+		}
+
+		c.Next()
+	}
+}