feat: add source request log (#71)

Co-authored-by: shenyuning <[email protected]>
Co-authored-by: sxueck <[email protected]>

lib/log.go

@@ -0,0 +1,31 @@
+package lib
+
+import (
+	"context"
+	"log"
+	"time"
+)
+
+// map[reqHost:username]lastRequestSuccessTime
+var authorizedSource = make(map[string]time.Time, 1)
+
+func LastRequestLogIndex(ctx context.Context) {
+	updateInterval := 5 * time.Second
+	ticker := time.NewTicker(updateInterval)
+	for {
+		ticker.Reset(updateInterval)
+		select {
+		case <-ctx.Done():
+			log.Println("received a signal to cancel the service")
+			return
+		case <-ticker.C:
+			for v, k := range authorizedSource {
+				// no response for 2 minutes log again
+				if k.Unix()+(60*2) < time.Now().Unix() {
+					log.Printf("%s cache will be clean\n", v)
+					delete(authorizedSource, v)
+				}
+			}
+		}
+	}
+}