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97855d9094
Introduce a MassTransit saga state machine that correlates by TrackId and
tracks the two parallel processing slips (picture + audio):
- TrackProcessingStateMachine + EF-persisted TrackProcessingState
(pessimistic concurrency, EntityFrameworkRepository), migration added
- Starts on CreateTrackResourcesEvent; UpdateTrack{Picture,Audio}Activity now
publish TrackPictureProcessed / TrackAudioProcessed on success; when both
arrive the saga finalizes (Ready). Failure transitions to a Failed state
(cleanup wired in the next phase)
- Add LifeCycleStatus.Failed and the four outcome events
Verified: booted the Worker against RabbitMQ + migrated Postgres in Docker;
the saga endpoint 'track-processing-state' is configured and the bus starts
clean.
Build: 0 warnings, 0 errors.
68 lines
3.0 KiB
C#
68 lines
3.0 KiB
C#
using MassTransit;
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using Musify.Application.Events;
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namespace Musify.Infrastructure.MassTransit.Sagas
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{
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public sealed class TrackProcessingStateMachine : MassTransitStateMachine<TrackProcessingState>
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{
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public State Processing { get; private set; } = null!;
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public State Failed { get; private set; } = null!;
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public Event<CreateTrackResourcesEvent> ProcessingStarted { get; private set; } = null!;
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public Event<TrackPictureProcessed> PictureProcessed { get; private set; } = null!;
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public Event<TrackAudioProcessed> AudioProcessed { get; private set; } = null!;
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public Event<TrackPictureProcessingFailed> PictureFailed { get; private set; } = null!;
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public Event<TrackAudioProcessingFailed> AudioFailed { get; private set; } = null!;
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public TrackProcessingStateMachine()
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{
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InstanceState(state => state.CurrentState);
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Event(() => ProcessingStarted, config => config.CorrelateById(context => context.Message.TrackId));
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Event(() => PictureProcessed, config => config.CorrelateById(context => context.Message.TrackId));
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Event(() => AudioProcessed, config => config.CorrelateById(context => context.Message.TrackId));
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Event(() => PictureFailed, config => config.CorrelateById(context => context.Message.TrackId));
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Event(() => AudioFailed, config => config.CorrelateById(context => context.Message.TrackId));
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Initially(
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When(ProcessingStarted)
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.Then(context =>
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{
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context.Saga.CreatedAt = DateTime.UtcNow;
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context.Saga.UpdatedAt = DateTime.UtcNow;
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})
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.TransitionTo(Processing));
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During(Processing,
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When(PictureProcessed)
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.Then(context =>
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{
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context.Saga.PictureProcessed = true;
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context.Saga.UpdatedAt = DateTime.UtcNow;
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})
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.If(context => context.Saga.AudioProcessed, binder => binder.Finalize()),
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When(AudioProcessed)
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.Then(context =>
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{
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context.Saga.AudioProcessed = true;
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context.Saga.UpdatedAt = DateTime.UtcNow;
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})
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.If(context => context.Saga.PictureProcessed, binder => binder.Finalize()),
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When(PictureFailed)
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.Then(context => context.Saga.UpdatedAt = DateTime.UtcNow)
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.TransitionTo(Failed),
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When(AudioFailed)
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.Then(context => context.Saga.UpdatedAt = DateTime.UtcNow)
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.TransitionTo(Failed));
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During(Failed,
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Ignore(PictureProcessed),
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Ignore(AudioProcessed),
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Ignore(PictureFailed),
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Ignore(AudioFailed));
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SetCompletedWhenFinalized();
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}
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}
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}
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