]> Sergey Matveev's repositories - btrtrc.git/blob - tracker/http/scrape.go
Support scraping from HTTP trackers
[btrtrc.git] / tracker / http / scrape.go
1 package httpTracker
2
3 import (
4         "context"
5         "log"
6         "net/http"
7         "net/url"
8
9         "github.com/anacrolix/torrent/bencode"
10         "github.com/anacrolix/torrent/tracker/udp"
11         "github.com/anacrolix/torrent/types/infohash"
12 )
13
14 type scrapeResponse struct {
15         Files files `bencode:"files"`
16 }
17
18 // Bencode should support bencode.Unmarshalers from a string in the dict key position.
19 type files = map[string]udp.ScrapeInfohashResult
20
21 func (cl Client) Scrape(ctx context.Context, ihs []infohash.T) (out udp.ScrapeResponse, err error) {
22         _url := cl.url_.JoinPath("..", "scrape")
23         query, err := url.ParseQuery(_url.RawQuery)
24         if err != nil {
25                 return
26         }
27         for _, ih := range ihs {
28                 query.Add("info_hash", ih.AsString())
29         }
30         _url.RawQuery = query.Encode()
31         log.Printf("%q", _url.String())
32         req, err := http.NewRequestWithContext(ctx, http.MethodGet, _url.String(), nil)
33         if err != nil {
34                 return
35         }
36         resp, err := cl.hc.Do(req)
37         if err != nil {
38                 return
39         }
40         defer resp.Body.Close()
41         var decodedResp scrapeResponse
42         err = bencode.NewDecoder(resp.Body).Decode(&decodedResp)
43         for _, ih := range ihs {
44                 out = append(out, decodedResp.Files[ih.AsString()])
45         }
46         return
47 }