Overview:

We’re requesting the introduction of a central event/message bus within the Rewst platform to enable loosely coupled, event-driven automation. This feature would allow workflows to publish events and other workflows to subscribe to those events with flexible filtering.

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Current Limitations:

Rewst currently provides:

Completion Handlers: Workflows can trigger other workflows on success/failure, but this creates a tight coupling between workflows and doesn’t allow filtering or conditional logic based on event content.

Webhook Triggers: While useful, these require explicitly targeting a workflow and do not support decoupled broadcasting or internal event reuse.

These approaches require hardcoding relationships between workflows, which limits scalability, reusability, and maintainability.

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Proposed Enhancement:

Introduce a central internal event bus, where:

Any workflow can publish an event to the bus (e.g., user.onboarded, ticket.closed, backup.failed), optionally including a payload (e.g., JSON with metadata).

Other workflows can subscribe to events via a trigger that filters by:

Event name/topic (e.g., wildcard or prefix support)

Attributes in the event payload (e.g., event.customer == "Acme")

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Example Use Cases:

A provisioning workflow publishes user.provisioned. Several other workflows listen for this:

One sends a welcome email.

One provisions access to a specific app only if department == "Finance".

A monitoring process emits job.failed. A responder workflow only triggers if severity == "critical".

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Benefits:

Enables loosely coupled, reactive automation.

Reduces rigid workflow chaining and hardcoded logic.

Improves reusability by decoupling logic across domains.

Supports scalable, modular architecture aligned with modern event-driven design.

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Optional Future Enhancements:

Add event history/replay for observability and debugging.

Support external systems publishing to the internal bus or consuming from it.

UI for exploring active events and their consumers.