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Merge pull request #17 from PowerLoom/feat/close-sub-stream
Better handling of grpc and libp2p connections and streams
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package service | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/libp2p/go-libp2p/core/network" | ||
| "github.com/libp2p/go-libp2p/core/peer" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type streamPool struct { | ||
| streams chan network.Stream | ||
| maxSize int | ||
| createStream func() (network.Stream, error) | ||
| mu sync.Mutex | ||
| sequencerID peer.ID | ||
| stopChan chan struct{} | ||
| } | ||
|
|
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| func newStreamPool(maxSize int, sequencerID peer.ID, createStream func() (network.Stream, error)) *streamPool { | ||
| pool := &streamPool{ | ||
| streams: make(chan network.Stream, maxSize), | ||
| maxSize: maxSize, | ||
| createStream: createStream, | ||
| sequencerID: sequencerID, | ||
| } | ||
| go pool.maintainPool(context.Background()) | ||
| return pool | ||
| } | ||
|
|
||
| func (p *streamPool) GetStream() (network.Stream, error) { | ||
| select { | ||
| case stream := <-p.streams: | ||
| if stream.Conn().IsClosed() { | ||
| stream.Close() | ||
| return p.createNewStream() | ||
| } | ||
| return stream, nil | ||
| default: | ||
| return p.createNewStream() | ||
| } | ||
| } | ||
|
|
||
| func (p *streamPool) ReturnStream(stream network.Stream) { | ||
| if stream.Conn().IsClosed() { | ||
| stream.Close() | ||
| return | ||
| } | ||
|
|
||
| select { | ||
| case p.streams <- stream: | ||
| // Stream returned to pool | ||
| default: | ||
| // Pool is full, close the stream | ||
| stream.Close() | ||
| } | ||
| } | ||
|
|
||
| func (p *streamPool) Stop() { | ||
| close(p.stopChan) | ||
| } | ||
|
|
||
| func (p *streamPool) maintainPool(ctx context.Context) { | ||
| ticker := time.NewTicker(900 * time.Second) | ||
| defer ticker.Stop() | ||
|
|
||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-p.stopChan: | ||
| return | ||
| case <-ticker.C: | ||
| p.fillPool() | ||
| p.cleanPool() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (p *streamPool) fillPool() { | ||
| p.mu.Lock() | ||
| defer p.mu.Unlock() | ||
|
|
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| currentSize := len(p.streams) | ||
| for i := currentSize; i < p.maxSize; i++ { | ||
| stream, err := p.createStream() | ||
| if err != nil { | ||
| log.Errorf("Failed to create stream: %v", err) | ||
| break | ||
| } | ||
| p.ReturnStream(stream) | ||
| } | ||
| } | ||
|
|
||
| func (p *streamPool) cleanPool() { | ||
| p.mu.Lock() | ||
| defer p.mu.Unlock() | ||
|
|
||
| validStreams := make([]network.Stream, 0, len(p.streams)) | ||
| for len(p.streams) > 0 { | ||
| select { | ||
| case stream := <-p.streams: | ||
| if !stream.Conn().IsClosed() { | ||
| validStreams = append(validStreams, stream) | ||
| } else { | ||
| stream.Close() | ||
| } | ||
| default: | ||
| break | ||
| } | ||
| } | ||
|
|
||
| for _, stream := range validStreams { | ||
| p.streams <- stream | ||
| } | ||
| } | ||
|
|
||
| func (p *streamPool) createNewStream() (network.Stream, error) { | ||
| p.mu.Lock() | ||
| defer p.mu.Unlock() | ||
| return p.createStream() | ||
| } |
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