chg: feat: rewrite to be a torrent indexer

scrape/info.go

@@ -0,0 +1,75 @@
+package goscrape
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/felipemarinho97/torrent-indexer/cache"
+)
+
+func getPeersFromCache(ctx context.Context, r *cache.Redis, infoHash string) (int, int, error) {
+	// get peers and seeds from redis first
+	peersCache, err := r.Get(ctx, infoHash)
+	if err == nil {
+		var peers map[string]int
+		err = json.Unmarshal(peersCache, &peers)
+		if err != nil {
+			return 0, 0, err
+		}
+		return peers["leech"], peers["seed"], nil
+	}
+	return 0, 0, err
+}
+
+func setPeersToCache(ctx context.Context, r *cache.Redis, infoHash string, peer, seed int) error {
+	peers := map[string]int{
+		"leech": peer,
+		"seed":  seed,
+	}
+	peersJSON, err := json.Marshal(peers)
+	if err != nil {
+		return err
+	}
+	err = r.SetWithExpiration(ctx, infoHash, peersJSON, 24*time.Hour)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func GetLeechsAndSeeds(ctx context.Context, r *cache.Redis, infoHash string, trackers []string) (int, int, error) {
+	var leech, seed int
+	leech, seed, err := getPeersFromCache(ctx, r, infoHash)
+	if err != nil {
+		fmt.Println("unable to get peers from cache for infohash:", infoHash)
+	} else {
+		fmt.Println("get from cache> leech:", leech, "seed:", seed)
+		return leech, seed, nil
+	}
+
+	for _, tracker := range trackers {
+		// get peers and seeds from redis first
+		scraper, err := New(tracker)
+		if err != nil {
+			fmt.Println(err)
+			continue
+		}
+
+		scraper.SetTimeout(500 * time.Millisecond)
+
+		// get peers and seeds from redis first
+		res, err := scraper.Scrape([]byte(infoHash))
+		if err != nil {
+			fmt.Println(err)
+			continue
+		}
+
+		leech += int(res[0].Leechers)
+		seed += int(res[0].Seeders)
+		setPeersToCache(ctx, r, infoHash, leech, seed)
+		return leech, seed, nil
+	}
+	return leech, seed, nil
+}