100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package goscrape
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import (
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"context"
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"encoding/json"
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"fmt"
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"time"
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"github.com/felipemarinho97/torrent-indexer/cache"
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"github.com/felipemarinho97/torrent-indexer/monitoring"
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)
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type peers struct {
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Seeders int `json:"seed"`
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Leechers int `json:"leech"`
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}
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func getPeersFromCache(ctx context.Context, r *cache.Redis, infoHash string) (int, int, error) {
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// get peers and seeds from redis first
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peersCache, err := r.Get(ctx, infoHash)
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if err == nil {
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var peers peers
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err = json.Unmarshal(peersCache, &peers)
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if err != nil {
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return 0, 0, err
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}
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return peers.Leechers, peers.Seeders, nil
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}
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return 0, 0, err
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}
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func setPeersToCache(ctx context.Context, r *cache.Redis, infoHash string, peer, seed int) error {
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peers := peers{
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Seeders: seed,
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Leechers: peer,
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}
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peersJSON, err := json.Marshal(peers)
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if err != nil {
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return err
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}
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err = r.SetWithExpiration(ctx, infoHash, peersJSON, 24*time.Hour)
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if err != nil {
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return err
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}
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return nil
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}
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func GetLeechsAndSeeds(ctx context.Context, r *cache.Redis, m *monitoring.Metrics, infoHash string, trackers []string) (int, int, error) {
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leech, seed, err := getPeersFromCache(ctx, r, infoHash)
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if err != nil {
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m.CacheHits.WithLabelValues("peers").Inc()
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fmt.Println("unable to get peers from cache for infohash:", infoHash)
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} else {
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m.CacheMisses.WithLabelValues("peers").Inc()
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fmt.Println("get from cache> leech:", leech, "seed:", seed)
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return leech, seed, nil
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}
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var peerChan = make(chan peers)
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var errChan = make(chan error)
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for _, tracker := range trackers {
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go func(tracker string) {
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// get peers and seeds from redis first
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scraper, err := New(tracker)
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if err != nil {
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errChan <- err
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return
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}
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scraper.SetTimeout(500 * time.Millisecond)
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// get peers and seeds from redis first
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res, err := scraper.Scrape([]byte(infoHash))
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if err != nil {
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errChan <- err
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return
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}
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peerChan <- peers{
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Seeders: int(res[0].Seeders),
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Leechers: int(res[0].Leechers),
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}
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}(tracker)
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}
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var peer peers
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for i := 0; i < len(trackers); i++ {
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select {
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case peer = <-peerChan:
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setPeersToCache(ctx, r, infoHash, peer.Leechers, peer.Seeders)
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return peer.Leechers, peer.Seeders, nil
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case err := <-errChan:
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fmt.Println(err)
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}
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}
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return 0, 0, fmt.Errorf("unable to get peers from trackers")
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}
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