Dmitry Sergeev
111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package playback
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import (
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"errors"
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"fmt"
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)
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type SessionCommandKind uint8
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const (
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CommandSetVideo SessionCommandKind = iota + 1
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CommandSetAudio
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CommandStopVideo
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CommandStopAudio
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CommandStopAll
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CommandResumeVideo
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CommandResumeAudio
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CommandResumeAll
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CommandRemoveVideo
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CommandRemoveAudio
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CommandEnableSync
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CommandDisableSync
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)
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type SessionCommand struct {
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Kind SessionCommandKind
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Config FeedConfig // Used only by SetVideo and SetAudio.
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}
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var (
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ErrUnknownSessionCommand = errors.New("unknown session command")
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ErrVideoNotConfigured = errors.New("video feed is not configured")
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ErrAudioNotConfigured = errors.New("audio feed is not configured")
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)
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func ApplySessionCommand(
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current SessionConfig,
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command SessionCommand,
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) (SessionConfig, error) {
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next := current
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switch command.Kind {
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case CommandSetVideo:
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if !command.Config.IsConfigured() {
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return current, ErrVideoNotConfigured
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}
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if err := command.Config.Validate(); err != nil {
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return current, fmt.Errorf("validate video command: %w", err)
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}
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next.Video = command.Config
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case CommandSetAudio:
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if !command.Config.IsConfigured() {
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return current, ErrAudioNotConfigured
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}
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if err := command.Config.Validate(); err != nil {
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return current, fmt.Errorf("validate audio command: %w", err)
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}
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next.Audio = command.Config
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case CommandStopVideo:
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next.Video.Active = false
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next.SyncRequested = false
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case CommandStopAudio:
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next.Audio.Active = false
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next.SyncRequested = false
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case CommandStopAll:
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next.Video.Active = false
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next.Audio.Active = false
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case CommandResumeVideo:
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if !next.Video.IsConfigured() {
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return current, ErrVideoNotConfigured
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}
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next.Video.Active = true
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case CommandResumeAudio:
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if !next.Audio.IsConfigured() {
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return current, ErrAudioNotConfigured
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}
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next.Audio.Active = true
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case CommandResumeAll:
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next.Video.Active = next.Video.IsConfigured()
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next.Audio.Active = next.Audio.IsConfigured()
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case CommandRemoveVideo:
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next.Video = FeedConfig{}
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next.SyncRequested = false
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case CommandRemoveAudio:
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next.Audio = FeedConfig{}
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next.SyncRequested = false
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case CommandEnableSync:
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next.SyncRequested = true
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case CommandDisableSync:
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next.SyncRequested = false
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default:
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return current, ErrUnknownSessionCommand
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}
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if err := next.Validate(); err != nil {
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return current, fmt.Errorf("validate desired session: %w", err)
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}
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return next, nil
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}
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