neko/internal/capture/screencast.go

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package capture
import (
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"errors"
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"sync"
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"sync/atomic"
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"time"
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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"
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)
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// timeout between intervals, when screencast pipeline is checked
const screencastTimeout = 5 * time.Second
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type ScreencastManagerCtx struct {
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logger zerolog.Logger
mu sync.Mutex
wg sync.WaitGroup
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pipeline gst.Pipeline
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pipelineStr string
pipelineMu sync.Mutex
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image types.Sample
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imageMu sync.Mutex
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tickerStop chan struct{}
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enabled bool
started bool
expired int32
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// metrics
imagesCounter prometheus.Counter
pipelinesCounter prometheus.Counter
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pipelinesActive prometheus.Gauge
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}
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func screencastNew(enabled bool, pipelineStr string) *ScreencastManagerCtx {
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logger := log.With().
Str("module", "capture").
Str("submodule", "screencast").
Logger()
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manager := &ScreencastManagerCtx{
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logger: logger,
pipelineStr: pipelineStr,
tickerStop: make(chan struct{}),
enabled: enabled,
started: false,
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// metrics
imagesCounter: promauto.NewCounter(prometheus.CounterOpts{
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Name: "screencast_images_total",
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Namespace: "neko",
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Subsystem: "capture",
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Help: "Total number of created images.",
}),
pipelinesCounter: promauto.NewCounter(prometheus.CounterOpts{
Name: "pipelines_total",
Namespace: "neko",
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Subsystem: "capture",
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Help: "Total number of created pipelines.",
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ConstLabels: map[string]string{
"submodule": "screencast",
"video_id": "main",
"codec_name": "-",
"codec_type": "-",
},
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}),
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pipelinesActive: promauto.NewGauge(prometheus.GaugeOpts{
Name: "pipelines_active",
Namespace: "neko",
Subsystem: "capture",
Help: "Total number of active pipelines.",
ConstLabels: map[string]string{
"submodule": "screencast",
"video_id": "main",
"codec_name": "-",
"codec_type": "-",
},
}),
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}
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manager.wg.Add(1)
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go func() {
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defer manager.wg.Done()
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ticker := time.NewTicker(screencastTimeout)
defer ticker.Stop()
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for {
select {
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case <-manager.tickerStop:
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return
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case <-ticker.C:
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if manager.Started() && !atomic.CompareAndSwapInt32(&manager.expired, 0, 1) {
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manager.stop()
}
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}
}
}()
return manager
}
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func (manager *ScreencastManagerCtx) shutdown() {
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manager.logger.Info().Msgf("shutdown")
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manager.destroyPipeline()
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close(manager.tickerStop)
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manager.wg.Wait()
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}
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func (manager *ScreencastManagerCtx) Enabled() bool {
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manager.mu.Lock()
defer manager.mu.Unlock()
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return manager.enabled
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}
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func (manager *ScreencastManagerCtx) Started() bool {
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manager.mu.Lock()
defer manager.mu.Unlock()
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return manager.started
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}
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func (manager *ScreencastManagerCtx) Image() ([]byte, error) {
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atomic.StoreInt32(&manager.expired, 0)
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err := manager.start()
if err != nil && !errors.Is(err, types.ErrCapturePipelineAlreadyExists) {
return nil, err
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}
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manager.imageMu.Lock()
defer manager.imageMu.Unlock()
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if manager.image.Data == nil {
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return nil, errors.New("image data not found")
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}
return manager.image.Data, nil
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}
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func (manager *ScreencastManagerCtx) start() error {
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manager.mu.Lock()
defer manager.mu.Unlock()
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if !manager.enabled {
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return errors.New("screencast not enabled")
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}
err := manager.createPipeline()
if err != nil {
return err
}
manager.started = true
return nil
}
func (manager *ScreencastManagerCtx) stop() {
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manager.mu.Lock()
defer manager.mu.Unlock()
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manager.started = false
manager.destroyPipeline()
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}
func (manager *ScreencastManagerCtx) createPipeline() error {
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manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
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if manager.pipeline != nil {
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return types.ErrCapturePipelineAlreadyExists
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}
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var err error
manager.logger.Info().
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Str("str", manager.pipelineStr).
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Msgf("creating pipeline")
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manager.pipeline, err = gst.CreatePipeline(manager.pipelineStr)
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if err != nil {
return err
}
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manager.pipeline.AttachAppsink("appsink")
manager.pipeline.Play()
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manager.pipelinesCounter.Inc()
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manager.pipelinesActive.Set(1)
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// get first image
select {
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case image, ok := <-manager.pipeline.Sample():
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if !ok {
return errors.New("unable to get first image")
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} else {
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manager.setImage(image)
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}
case <-time.After(1 * time.Second):
return errors.New("timeouted while waiting for first image")
}
manager.wg.Add(1)
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pipeline := manager.pipeline
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go func() {
manager.logger.Debug().Msg("started receiving images")
defer manager.wg.Done()
for {
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image, ok := <-pipeline.Sample()
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if !ok {
manager.logger.Debug().Msg("stopped receiving images")
return
}
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manager.setImage(image)
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}
}()
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return nil
}
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func (manager *ScreencastManagerCtx) setImage(image types.Sample) {
manager.imageMu.Lock()
manager.image = image
manager.imageMu.Unlock()
manager.imagesCounter.Inc()
}
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func (manager *ScreencastManagerCtx) destroyPipeline() {
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manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
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if manager.pipeline == nil {
return
}
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manager.pipeline.Destroy()
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manager.logger.Info().Msgf("destroying pipeline")
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manager.pipeline = nil
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manager.pipelinesActive.Set(0)
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}