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Dev Mode (E4): live stream and DFA state

Console Dev Mode visualizes replay job progress, per-decision latency, DFA state, and chunk/flush ticks.

Backend (replay service)

Routed via the API gateway to the replay service:

Method Path Purpose
GET /api/v1/replay/:jobId/stream SSE stream of live Dev Mode events
GET /api/v1/replay/:jobId/dfa_state Last known DFA state for a job

Event types on the stream: hello, progress, dfa_state, chunk_tick, flush_tick, decision_latency, job_started, job_completed.

Implementation: services/replay-service/main.go (getDFAStateHandler, stream routes).

Console UI

Page at /dev (console/src/pages/DevModePage.tsx):

  • Start a replay by decision ID, then connect the SSE stream
  • Shows DFA state, decision latencies (ms), chunk/flush ticks, and a live events panel

API helpers in console/src/services/api.ts: getDevModeStreamUrl, getDFAState.

Notes

  • SSE payloads are JSON in event.data
  • Production-shaped deployments should emit latencies and DFA state from runtime/sidecar instrumentation rather than simulated ticks
  • Local stack ports: local-workflows.md