25 lines
1.1 KiB
Go
25 lines
1.1 KiB
Go
package webrtc
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import (
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"context"
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)
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// GatheringCompletePromise is a Pion specific helper function that returns a channel that is closed when gathering is complete.
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// This function may be helpful in cases where you are unable to trickle your ICE Candidates.
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//
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// It is better to not use this function, and instead trickle candidates. If you use this function you will see longer connection startup times.
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// When the call is connected you will see no impact however.
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func GatheringCompletePromise(pc *PeerConnection) (gatherComplete <-chan struct{}) {
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gatheringComplete, done := context.WithCancel(context.Background())
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// It's possible to miss the GatherComplete event since setGatherCompleteHandler is an atomic operation and the
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// promise might have been created after the gathering is finished. Therefore, we need to check if the ICE gathering
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// state has changed to complete so that we don't block the caller forever.
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pc.setGatherCompleteHandler(func() { done() })
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if pc.ICEGatheringState() == ICEGatheringStateComplete {
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done()
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}
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return gatheringComplete.Done()
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}
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