feat: add simple cache, due to jackett poor performance

pkg/torznab/cache.go

@@ -0,0 +1,31 @@
+package torznab
+
+import (
+	"polaris/log"
+	"polaris/pkg/utils"
+
+	"github.com/robfig/cron"
+
+	"time"
+)
+
+var cache utils.Map[string, TimedResponse] = utils.Map[string, TimedResponse]{}
+
+type TimedResponse struct {
+	Response
+	T time.Time
+}
+
+func init() {
+	cr := cron.New()
+	cr.AddFunc("@ervery 1m", func() {
+		cache.Range(func(key string, value TimedResponse) bool {
+			if time.Since(value.T) > 30*time.Minute {
+				log.Debugf("delete old cache: %v", key)
+				cache.Delete(key)
+			}
+			return true
+		})
+	})
+	cr.Start()
+}