 weishu
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15f48c9c65
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feat(ios): SSE client + reconnect state machine (A-M1c)
HapiClient/SSE per docs/api/client-contract/sse.md and the web reference
(web/src/hooks/useSSE.ts):
- SSELineParser: incremental frame parser (LF/CRLF, multi-line data,
comments, retry ignored); per-block ids only — sticky-cursor semantics
live in the caller so id-less heartbeats can never blank the cursor.
- ReconnectPolicy + SSETimings: 0s first retry, 1s x2 capped at 30s,
300s slow ceiling after 8 attempts, 0-500ms injectable jitter; connect
timeout 10s, staleness 90s, foreground-resume 45s, watchdog tick 10s.
- SSETransport protocol + URLSessionSSETransport (URLSession.bytes with
dedicated config: 300s idle timeout, 7d resource, no waitsForConnectivity).
- actor SSEClient: idle/connecting/connected/backoff/suspended machine;
handshake-gated connected state surfacing resume ok|gap; per-subscription
cursor sent as ?lastEventId, advanced only after consumer yield
(at-least-once); one free token-refresh retry per connect cycle on 401;
suspend defers retries, resume applies the 45s staleness check;
acceptEncodingIdentity escape hatch (gzip streaming verification TODO).
- NetworkPathObserving + NWPathObserver: path change while connected is
treated as a transport error (immediate reconnect).
- swift-testing suite on a fake transport + manual clock: parser edge
cases, exact backoff schedule + seeded jitter bounds, handshake gating,
ok/gap verdicts, cursor replay + isolation, heartbeat vs watchdog,
90s staleness, connect timeout, suspend/resume, event ordering,
unknown-type passthrough, 401 bypass cap, path-change reconnect.
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2026-08-17 15:28:14 +08:00 |
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