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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package handlers | ||
|
|
||
| import ( | ||
| "errors" | ||
| "log/slog" | ||
| "net" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/kelindar/binary" | ||
| "github.com/xtaci/smux" | ||
| ) | ||
|
|
||
| type remoteResult struct { | ||
| instaData *InstaData | ||
| outChan chan error | ||
| } | ||
|
|
||
| var sessCount atomic.Int32 | ||
| var inChan chan remoteResult | ||
|
|
||
| func init() { | ||
| inChan = make(chan remoteResult) | ||
|
|
||
| ln, err := net.Listen("tcp", "0.0.0.0:4444") | ||
| if err != nil { | ||
| return | ||
| } | ||
| slog.Info("remote scraper is listening on", "address", ln.Addr()) | ||
|
|
||
| go func() { | ||
| for { | ||
| conn, err := ln.Accept() | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| go handleConnection(conn) | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func handleConnection(conn net.Conn) { | ||
| smuxConfig := smux.DefaultConfig() | ||
| smuxConfig.Version = 2 | ||
|
|
||
| session, err := smux.Server(conn, smuxConfig) | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer session.Close() | ||
| defer sessCount.Add(-1) | ||
|
|
||
| sessCount.Add(1) | ||
| var wg sync.WaitGroup | ||
| for { | ||
| stream, err := session.AcceptStream() | ||
| if err != nil { | ||
| break | ||
| } | ||
|
|
||
| wg.Add(1) | ||
| go func(stream *smux.Stream) { | ||
| defer func() { | ||
| stream.Close() | ||
| wg.Done() | ||
| }() | ||
|
|
||
| for rm := range inChan { | ||
| if err := stream.SetDeadline(time.Now().Add(3 * time.Second)); err != nil { | ||
| slog.Error("failed to set deadline", "err", err) | ||
| rm.outChan <- err | ||
| return | ||
| } | ||
|
|
||
| buf := []byte(rm.instaData.PostID) | ||
| if _, err = stream.Write(buf); err != nil { | ||
| slog.Error("failed to write to stream", "err", err) | ||
| rm.outChan <- err | ||
| return | ||
| } | ||
|
|
||
| outBuf := make([]byte, 1024*1024) | ||
| n, err := stream.Read(outBuf) | ||
| if err != nil { | ||
| slog.Error("failed to read from stream", "err", err) | ||
| rm.outChan <- err | ||
| return | ||
| } | ||
|
|
||
| if err = binary.Unmarshal(outBuf[:n], rm.instaData); err != nil { | ||
| slog.Error("failed to unmarshal data", "err", err) | ||
| rm.outChan <- err | ||
| return | ||
| } | ||
| rm.outChan <- nil | ||
| } | ||
| }(stream) | ||
| } | ||
|
|
||
| wg.Wait() | ||
| } | ||
|
|
||
| func ScrapeRemote(i *InstaData) error { | ||
| if sessCount.Load() == 0 { | ||
| return errors.New("remote scraper is not running") | ||
| } | ||
|
|
||
| remoteRes := remoteResult{ | ||
| instaData: i, | ||
| outChan: make(chan error), | ||
| } | ||
|
|
||
| select { | ||
| case inChan <- remoteRes: | ||
| case <-time.After(time.Second): | ||
| return errors.New("no remote scraper is ready") | ||
| } | ||
|
|
||
| select { | ||
| case err := <-remoteRes.outChan: | ||
| return err | ||
| case <-time.After(5 * time.Second): | ||
| return errors.New("failed to get data from remote scraper") | ||
| } | ||
| } |
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