neko/server/internal/capture/streamsrc.go

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package capture
import (
"errors"
"sync"
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"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
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"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"github.com/demodesk/neko/pkg/gst"
"github.com/demodesk/neko/pkg/types"
"github.com/demodesk/neko/pkg/types/codec"
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)
type StreamSrcManagerCtx struct {
logger zerolog.Logger
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enabled bool
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codecPipeline map[string]string // codec -> pipeline
codec codec.RTPCodec
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pipeline gst.Pipeline
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pipelineMu sync.Mutex
pipelineStr string
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// metrics
pushedData map[string]prometheus.Summary
pipelinesCounter map[string]prometheus.Counter
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pipelinesActive map[string]prometheus.Gauge
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}
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func streamSrcNew(enabled bool, codecPipeline map[string]string, video_id string) *StreamSrcManagerCtx {
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logger := log.With().
Str("module", "capture").
Str("submodule", "stream-src").
Str("video_id", video_id).Logger()
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pushedData := map[string]prometheus.Summary{}
pipelinesCounter := map[string]prometheus.Counter{}
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pipelinesActive := map[string]prometheus.Gauge{}
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for codecName, pipeline := range codecPipeline {
codec, ok := codec.ParseStr(codecName)
if !ok {
logger.Fatal().
Str("codec", codecName).
Str("pipeline", pipeline).
Msg("unknown codec name")
}
pushedData[codecName] = promauto.NewSummary(prometheus.SummaryOpts{
Name: "streamsrc_data_bytes",
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Namespace: "neko",
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Subsystem: "capture",
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Help: "Data pushed to a pipeline (in bytes).",
ConstLabels: map[string]string{
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"video_id": video_id,
"codec_name": codec.Name,
"codec_type": codec.Type.String(),
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},
})
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pipelinesCounter[codecName] = promauto.NewCounter(prometheus.CounterOpts{
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Name: "pipelines_total",
Namespace: "neko",
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Subsystem: "capture",
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Help: "Total number of created pipelines.",
ConstLabels: map[string]string{
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"submodule": "streamsrc",
"video_id": video_id,
"codec_name": codec.Name,
"codec_type": codec.Type.String(),
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},
})
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pipelinesActive[codecName] = promauto.NewGauge(prometheus.GaugeOpts{
Name: "pipelines_active",
Namespace: "neko",
Subsystem: "capture",
Help: "Total number of active pipelines.",
ConstLabels: map[string]string{
"submodule": "streamsrc",
"video_id": video_id,
"codec_name": codec.Name,
"codec_type": codec.Type.String(),
},
})
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}
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return &StreamSrcManagerCtx{
logger: logger,
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enabled: enabled,
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codecPipeline: codecPipeline,
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// metrics
pushedData: pushedData,
pipelinesCounter: pipelinesCounter,
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pipelinesActive: pipelinesActive,
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}
}
func (manager *StreamSrcManagerCtx) shutdown() {
manager.logger.Info().Msgf("shutdown")
manager.Stop()
}
func (manager *StreamSrcManagerCtx) Codec() codec.RTPCodec {
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manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
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return manager.codec
}
func (manager *StreamSrcManagerCtx) Start(codec codec.RTPCodec) error {
manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
if manager.pipeline != nil {
return types.ErrCapturePipelineAlreadyExists
}
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if !manager.enabled {
return errors.New("stream-src not enabled")
}
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found := false
for codecName, pipeline := range manager.codecPipeline {
if codecName == codec.Name {
manager.pipelineStr = pipeline
manager.codec = codec
found = true
break
}
}
if !found {
return errors.New("no pipeline found for a codec")
}
var err error
manager.logger.Info().
Str("codec", manager.codec.Name).
Str("src", manager.pipelineStr).
Msgf("creating pipeline")
manager.pipeline, err = gst.CreatePipeline(manager.pipelineStr)
if err != nil {
return err
}
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manager.pipeline.AttachAppsrc("appsrc")
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manager.pipeline.Play()
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manager.pipelinesCounter[manager.codec.Name].Inc()
manager.pipelinesActive[manager.codec.Name].Set(1)
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return nil
}
func (manager *StreamSrcManagerCtx) Stop() {
manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
if manager.pipeline == nil {
return
}
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manager.pipeline.Destroy()
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manager.pipeline = nil
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manager.logger.Info().
Str("codec", manager.codec.Name).
Str("src", manager.pipelineStr).
Msgf("destroying pipeline")
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manager.pipelinesActive[manager.codec.Name].Set(0)
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}
func (manager *StreamSrcManagerCtx) Push(bytes []byte) {
manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
if manager.pipeline == nil {
return
}
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manager.pipeline.Push(bytes)
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manager.pushedData[manager.codec.Name].Observe(float64(len(bytes)))
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}
func (manager *StreamSrcManagerCtx) Started() bool {
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manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
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return manager.pipeline != nil
}