feat(sdk): stream project events with reconnect and resume - #269
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📝 WalkthroughWalkthroughThe SDK now supports beta project event streams with SSE parsing, cursor resumption, reconnect handling, acknowledgements, gap reporting, and store adapters. Platform contracts, TypeScript exports, HTTP transport, documentation, and tests were updated. ChangesPlatform contracts and typed models
Streaming transport and runtime
Client resource and public API integration
Stream and coverage validation
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant EventsResource
participant HttpTransport
participant EventStream
participant StoreAdapter
EventsResource->>HttpTransport: open the project event stream
HttpTransport-->>EventStream: return the streaming response
EventStream->>EventStream: parse frames and resume cursors
EventStream-->>EventsResource: yield event items
EventStream-->>StoreAdapter: deliver webhook events and cursor metadata
StoreAdapter->>EventStream: abort on unsubscribe
Merge Risk: 🟡 Moderate · up to Streaming clients can receive incorrectly shaped acknowledgement results, delayed cancellation, or unnecessary reconnects, while the published contract can break generators. These issues should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 8 files. (7 skipped: 7 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Actionable comments posted: 6
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@contracts/openapi.platform.json`:
- Around line 30141-30154: Update the discriminator mapping for the event stream
frame union so every mapping value references the corresponding existing
PlatformAccessEventStream*Frame schema, matching the names used by the oneOf
entries. Preserve the existing type keys and discriminator propertyName while
replacing all unprefixed EventStream*Frame targets.
In `@packages/typescript/README.md`:
- Line 1193: Update the acknowledgeStream example to pass the defined
item.cursor and item.sequence fields instead of undefined cursor and sequence
variables, while preserving item.streamId.
In `@packages/typescript/src/platform/developer-resources.ts`:
- Around line 211-221: Update the acknowledgement response flow in the method
surrounding liveSource to request
DataEnvelope<EventStreamAcknowledgementReceipt> and apply unwrapResponse before
returning. Define EventStreamAcknowledgementReceipt as the inner payload with
streamId, acknowledgedCursor, sequence, and replayed directly, so callers
receive those fields on result.data.
In `@packages/typescript/src/platform/event-stream.ts`:
- Line 173: Update decodeWebhook to treat an omitted payload the same as a null
payload by guarding against both null and undefined before accessing
payload.data, while preserving the existing null return behavior.
- Around line 246-272: Update the reconnect loop after the try/finally block to
return immediately when stopped() reports an aborted caller signal, before
calculating the delay or invoking onReconnect. In the reconnect wait promise,
make timer and abort completion share a cleanup callback that clears the timer,
removes the abort listener, and resolves, preventing listener accumulation while
preserving immediate cancellation.
- Around line 180-185: Update retryAfterMs to reject blank retry-after headers,
parse both delta-seconds and HTTP-date values consistently with the transport
retry parser, and clamp valid server-directed delays to the configured
maxDelayMs reconnect ceiling used by the stream retry flow.
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📒 Files selected for processing (15)
CHANGELOG.mdREADME.mdcontracts/README.mdcontracts/coverage.jsoncontracts/openapi.platform.jsoncontracts/source.jsonpackages/typescript/README.mdpackages/typescript/src/index.tspackages/typescript/src/platform/developer-resources.tspackages/typescript/src/platform/event-stream.tspackages/typescript/src/platform/types.tspackages/typescript/src/transport/http.tspackages/typescript/test/coverage-reconciliation.test.tspackages/typescript/test/coverage.test.tspackages/typescript/test/event-stream.test.ts
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- advance the resume cursor on checkpoint frames - parse Retry-After as delta-seconds or HTTP-date, ignore blank values, and clamp server-directed delays to maxDelayMs - stop without waiting when the caller aborts before or during a reconnect, including after a normal connection close, and remove each delay listener - treat an absent event payload like null - unwrap the acknowledgement envelope so receipts are at result.data - fix the acknowledgement README example
…#187) Pins contracts to polymorfa/polymorfa 2259a1fd331c6ddbc8ad56a04333100ebfce7c2e. Keeps the event stream rows covered with refreshed fingerprints. Adds conversationTtlSeconds and the recipientMode enum to client rules, and the feature_unavailable and stream_* error codes.
1 participant
Summary
Adds the TypeScript SDK for the public project event stream (polymorfa/polymorfa#200). Stacked on that API PR: the contracts are synced from its branch at
09b8342c0d75817eb2c92035e17635061986e35f(coordinated PR dependency, not yet on monorepodev).client.project(id).events.stream({ types, since, signal })(organization clients passprojectId) returns anEventStream, an async iterable of{ event, webhook, cursor, streamId, sequence }.expiry, a recoverablegap,dropped,429(honorsRetry-After) or5xx, sending the last delivered cursor asLast-Event-ID.heartbeatIntervalMsforces a reconnect.onGapreportsretention_exceededgaps and keeps streaming;onReconnectreports each retry.feature_unavailable), 404, 400 (stream_cursor_invalid), 410 (stream_cursor_expired) and arevokedframe (PolymorfaAuthorizationError, codestream_revoked). Abortingsignalor breaking the loop ends it cleanly.webhookis the decoded exact webhook body, ornullwhen the body was not kept.events.acknowledgeStream(streamId, { cursor, sequence })andack: "manual".events.liveSource()returns aLiveEventSource-compatible adapter for@polymorfa/store.HttpTransport.openStream()opens long-lived responses with the client's auth and API-version headers; its timeout bounds only the wait for headers.CreateProjectRequest.defaultTiernarrowed to"free" | "standard" | "pro",ProductionEnrollmentResult.billingMode: "payg".@polymorfa/storecompatibility (PR #265)fromEventStream()in #265 does not work with the public stream as is: it parses each SSEdataas a webhook envelope, but the public stream wraps the envelope in a frame ({ type: "event", cursor, event: { …, payload: { encoding: "base64", data } } }) and also sendsready/heartbeatcontrol frames, which it would ingest as events.This PR adds
events.liveSource(), which already produces whatconnectEventSource()expects (webhook envelopes with cursor metadata), so no store change is required for server-side use. If the store should read the public stream directly fromfromEventStream(), #265 needs a small adapter: ignore frames whosetypeis notevent, decodeevent.payload.data(base64) into the envelope, skippayload: null, and usecursoras the checkpoint. Browser use of the public stream waits for the client-token stream (phase B), since server credentials must not reach a browser.Five-part check
polymorfa event streamon top of this method.packages/typescript/README.md(Stream events in real time),CHANGELOG.md,contracts/README.md. Public Mintlify SDK pages are updated after this merges (tracked in #200).developer.event-streamon the API; the SDK surfacesfeature_unavailableas an authorization error and does not retry it.Verification
test/event-stream.test.ts(13): request shape (path,types, headers, noLast-Event-IDon first connect), organizationprojectIdrequirement, resume afterexpiry, reconnect after network error and recoverable gap, heartbeat watchdog, retention gap callback, no retry onfeature_unavailable/ expired cursor /revoked,Retry-Afteron connection limit, clean abort, manual ACK,liveSourceadapter (skips body-less events, cursor metadata).npm run build,build:workspaces,typecheck,lint,format:check,check:coverage,check:namesandnpm test(74 files, 505 tests) pass.Need help on this PR? Tag
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