Middlewares refactored to multiple files in middleware package.

Extractors removed as they introduce complexity to scraper. Both in learning and developing.

middleware/metrics.go

@@ -0,0 +1,19 @@
+package middleware
+
+import (
+	"github.com/geziyor/geziyor/client"
+	"github.com/geziyor/geziyor/metrics"
+)
+
+// Metrics sets stats for request and responses
+type Metrics struct {
+	Metrics *metrics.Metrics
+}
+
+func (a *Metrics) ProcessRequest(r *client.Request) {
+	a.Metrics.RequestCounter.With("method", r.Method).Add(1)
+}
+
+func (a *Metrics) ProcessResponse(r *client.Response) {
+	a.Metrics.ResponseCounter.With("method", r.Request.Method).Add(1)
+}