webxr: detect passthrough-only (stream that never attaches) - #1142
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Addresses gear-xr-reliability-report.md item 7's "passthrough-only" state directly: the session can enter XR and call connect() successfully while the stream never attaches, with no error callback to signal it - isXRMode alone can't tell that state apart from a slow-but-fine connect. "Not detected today" per that doc. CloudXRComponent.tsx: a stream-attach timer starts right after connect() (inside the WebXR sessionstart handler, so genuinely "after session start" per the doc's wording - confirmed by tracing isXRMode's own sessionstart listener, a separate subscriber to the same underlying browser event). If onStreamStarted hasn't cleared it by the deadline, dispatches a synthetic recoverable StreamingError through the same onStreamStopped path a real one uses, so it gets the exact same bounded- retry treatment already built for real stream errors (PR #1122) rather than a separate mechanism. Doubles every attempt (this value, then x2, then x4, ...) for however many attempts reconnect.maxAttempts allows - not a fixed count - so a connection that's genuinely just slow, not stuck, gets more time on each retry instead of being cut off at the same threshold every time. The base timeout is now a standalone, independently configurable prop (streamAttachTimeoutMs, default 8000ms) - not nested inside `reconnect`, since detection always runs regardless of whether retry is enabled at all. Exposed as a settings-UI field alongside the existing retry settings, wired through the same URL_PARAMS/localStorage/CloudXR2DUI pipeline as everything else, with its own live-update listener (unlike reconnectMaxAttempts/reconnectDelayMs, which only take effect on next page load - this needs to apply within the current session for a just-configured value to matter for the connect attempt about to run). Still open: this only covers detection failing to ever attach in the first place. It does not cover a stream that attached successfully and then silently stopped compositing later without an onStreamStopped callback - a genuinely different, still-undetected failure mode if it occurs. Also open: the doc's item 9 (host-side connected-but-no-stream watchdog in oob_teleop_hub.py, using data it already tracks) - a complementary, still-unbuilt detection point from the host's perspective. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: Gareth Morgan <gmorgan@nvidia.com>
… test
Default STREAM_ATTACH_BASE_TIMEOUT_MS was 8s - far too aggressive for a
default: a real CloudXR server/network can legitimately take much longer
than a mock ever would to attach a stream, and a false positive here
means an otherwise-fine session gets torn down and retried for no
reason. Raised to 120000ms (2 minutes); callers who want faster
detection (e.g. tests) already have the streamAttachTimeoutMs override
for exactly that.
Adds tests/mock/StreamAttachTimeoutTest.tsx, a scripted harness mirroring
CloudXRComponentTest.tsx's pattern (real CloudXRComponent against
MockCloudXR, module-level mutable script state, appendLog, "S" to run),
dedicated to exercising streamAttachTimeoutMs + the doubling backoff +
the existing retry path together:
- streamAttachTimeoutMs=1000, reconnect={maxAttempts: 1, delayMs: 300}.
- Attempt 1: MockCloudXR.connectWait(1250) - over the 1x (1000ms) budget,
expected to time out via our own detection (not a manually triggered
failure) and retry.
- Attempt 2: connectWait(2000) - under the 2x (2000ms) doubled budget,
expected to reach Connected.
- Reapplies connectWait per attempt via onSessionReady (each retry
creates a brand-new MockCloudXR instance - connectWait() doesn't carry
over, same reasoning CloudXRComponentTest.tsx's own
pendingConnectWaitMs handles), and asserts PASS/FAIL on both reaching
Connected and having seen a "Reconnecting" status in between.
Verified 4/4 deterministic runs via Playwright driving the built page.
webpack.component-mock.js now builds both harnesses as separate entries/
HTML pages (bundle.[name].js, since output.filename can no longer be a
single fixed string with two entries) on the same dev server.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Signed-off-by: Gareth Morgan <gmorgan@nvidia.com>
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📝 WalkthroughWalkthroughCloudXRComponent adds an optional stream-attachment timeout, with a default of 120,000 ms. It scales the timeout by reconnect attempt and routes expiration through the existing stream-stop error handling. The web client exposes the setting through its configuration, URL parameter, and Troubleshooting UI. A browser-based mock harness tests delayed connections and reconnect behavior. Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant CloudXRComponent
participant WebXRSession
participant onStreamStopped
participant RetryPolicy
CloudXRComponent->>WebXRSession: initiate connect
CloudXRComponent->>CloudXRComponent: schedule scaled attachment timeout
CloudXRComponent->>onStreamStopped: dispatch synthetic streaming error on timeout
onStreamStopped->>RetryPolicy: apply configured recoverable-error retry policy
WebXRSession->>CloudXRComponent: report stream start or stop
CloudXRComponent->>CloudXRComponent: clear pending attachment timeout
Merge Risk: 🟡 Moderate · up to The new stream-attach timeout can leave an old connection running alongside a retry and report a false Connected state. Editing settings mid-connection can also silently disable detection. Resolve these before merging. 🚥 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. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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September 29, 2026 00:06
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Inline comments:
Review comments at
@deps/cloudxr/webxr_client/helpers/react/CloudXRComponent.tsx:
- Around line 626-627: Bound the computed attachTimeoutMs before scheduling it
with setTimeout in the stream-attachment timeout flow. Cap or reject configured
and URL-provided values, including the reconnect multiplier result, so the
scheduled delay never exceeds the browser timer limit.
- Around line 633-635: In the attach-timeout retry path in CloudXRComponent,
disconnect the timed-out CloudXR session instead of relying on the synthetic
onStreamStopped notification. Guard callbacks from that session so a late
onStreamStarted cannot change the current attempt’s state or clear its timer.
- Around line 699-702: Update the effect that manages streamAttachTimerRef so
changing config preserves or rearms the attachment-detection deadline for the
active connection attempt; do not require another sessionstart event to schedule
it after the effect re-registers.
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📒 Files selected for processing (10)
deps/cloudxr/webxr_client/helpers/react/CloudXRComponent.tsxdeps/cloudxr/webxr_client/helpers/react/utils.tsdeps/cloudxr/webxr_client/src/App.tsxdeps/cloudxr/webxr_client/src/CloudXR2DUI.tsxdeps/cloudxr/webxr_client/src/config/params.tsdeps/cloudxr/webxr_client/src/config/resolve.test.tsdeps/cloudxr/webxr_client/src/index.htmldeps/cloudxr/webxr_client/tests/mock/StreamAttachTimeoutTest.htmldeps/cloudxr/webxr_client/tests/mock/StreamAttachTimeoutTest.tsxdeps/cloudxr/webxr_client/webpack.component-mock.js
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All three verified against real code before fixing, per real cloudxr-js source confirming the underlying passthrough-only detection premise holds (checked separately this session - WebXR entry and stream attachment really are independent, sequential steps; a session stuck Connecting forever really is a permanent, silent raw-passthrough state). 1. Bound attachTimeoutMs at MAX_SET_TIMEOUT_MS (2147483647, setTimeout's own 32-bit-int delay limit). streamAttachTimeoutMs is user/URL-configurable with no upper bound, and doubles per attempt - without a cap, a large enough value could overflow and fire almost immediately instead of waiting, the opposite of the intended delay. 2. Disconnect the timed-out session before dispatching the synthetic error. Previously only the synthetic onStreamStopped fired - the old CloudXR session object itself kept running, so a late real onStreamStarted from it could still land after a retry had already started a new session, reporting a false Connected and wiping the new attempt's timer/state. cxrSession.disconnect() neuters it first. 3. Re-arm the attach timer when the effect re-registers mid-connection (e.g. the operator edits a setting - config's identity changes - while a stream is still attaching). The cleanup already cleared streamAttachTimerRef, but nothing rescheduled it: a fresh sessionstart event won't fire just because the effect re-ran, since the WebXR session is already live. Extracted armStreamAttachTimer (shared by the initial arm and this re-arm path) and cloudXRDelegatesRef / hasStreamStartedRef to make the delegates and attach-state reachable from outside handleSessionStart's closure. Verified: jest, eslint, prettier, tsc --noEmit all clean; the scripted StreamAttachTimeoutTest.tsx harness (attempt 1 fails over budget, attempt 2 succeeds under the doubled budget) still passes 3/3 with these changes. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: Gareth Morgan <gmorgan@nvidia.com>
…omponent A stream can attach (onStreamStarted fires) but never actually start rendering: the SDK's decoder warm-up phase either never produces a single frame, or produces some and then stalls, with no error and no existing timeout to catch it. This adds two more deadlines alongside the existing streamAttachTimeoutMs, parsed from the SDK's own warm-up progress/completion log messages via the existing onLog delegate: - warmupBeginTimeoutMs: no warm-up signal at all since the stream attached (fixed, 10s default). - warmupEndTimeoutMs: warm-up began but never finished (fixed, 30s default). Both feed the same bounded-retry path the attach timeout already uses, and neither grows per reconnect attempt - once a stream has genuinely attached, warm-up should take roughly constant time regardless of which attempt this is. Also documents (and now explicitly tests) that streaming/render metrics do not update while warm-up is stuck - a frozen StreamingFrameCount while the session otherwise reads Connected is the customer-visible symptom this whole feature exists to catch sooner. MockCloudXR gained a deterministic, timer-free way to drive this in tests: videoFrameReceived() queues a simulated decoded-video frame that the next render() call consumes (mirroring the real SDK's architecture), with setWarmupTotalFrames()/setWarmupFirstStatusFrame() controlling warm-up length and log cadence. StreamAttachTimeoutTest.tsx now exercises all three timeouts (attach, warmup-begin, warmup-end) in isolation and combination across one continuous 4-attempt sequence, with a new Playwright spec driving it against a real browser. Signed-off-by: Gareth Morgan <gmorgan@nvidia.com> Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: Gareth Morgan <gmorgan@nvidia.com>
CloudXRComponent already accepted these two props, but nothing in the actual app wired them through - only streamAttachTimeoutMs was URL-configurable/persisted, so the warm-up timers were stuck at their defaults in every real launch. Adds matching settings-panel fields (next to Stream Attach Timeout), URL params, and config plumbing, mirroring streamAttachTimeoutMs's existing pattern exactly: - src/index.html: two new config-section fields. - src/config/params.ts: two new URL_PARAMS entries (also makes them show up in the in-app "URL parameters" help panel). - helpers/react/utils.ts: two new CloudXRConfig fields. - src/CloudXR2DUI.tsx: input refs, default config, localStorage persistence mapping, change listeners, and config-build parsing. - src/App.tsx: passed through to CloudXRComponent. - src/config/resolve.test.ts: sampleValid() needed both keys added to its numeric-param set, or the generic "every form-backed param is URL-settable" test fails validation on them. Signed-off-by: Gareth Morgan <gmorgan@nvidia.com> Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: Gareth Morgan <gmorgan@nvidia.com>
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Summary
Addresses
gear-xr-reliability-report.mditem 7's "passthrough-only" state directly: the session can enter XR and callconnect()successfully while the stream never attaches, with no error callback to signal it -isXRModealone can't tell that state apart from a slow-but-fine connect. Confirmed as "not detected today" against the actual source.CloudXRComponent.tsx: a stream-attach timer starts right afterconnect()(inside the WebXRsessionstarthandler, so genuinely "after session start" - confirmed by tracingisXRMode's ownsessionstartlistener, a separate subscriber to the same underlying browser event). IfonStreamStartedhasn't cleared it by the deadline, dispatches a synthetic recoverableStreamingErrorthrough the sameonStreamStoppedpath a real one uses, so it gets the exact same bounded-retry treatment already built for real stream errors (feat(webxr): bounded streaming-session retry in CloudXRComponent #1122) rather than a separate mechanism.reconnect.maxAttemptsallows - not hardcoded - so a connection that's genuinely just slow, not stuck, gets more time on each retry instead of being cut off at the same threshold every time.streamAttachTimeoutMsis its own independently configurable prop (default 2 minutes - deliberately generous, since a real server/network can legitimately be much slower than a mock), not nested insidereconnect: detection always runs regardless of whether retry itself is enabled. Exposed as its own settings-UI field alongside the existing retry settings.tests/mock/StreamAttachTimeoutTest.tsx: new scripted harness (mirrorsCloudXRComponentTest.tsx's pattern) proving the timeout + doubling + retry work together - attempt 1 (mock takes 1.25s vs a 1s budget) fails and retries via our own detection; attempt 2 (mock takes 2s vs the doubled 2s budget) succeeds. Verified 4/4 deterministic runs via Playwright driving the built page.Still open (not this PR)
onStreamStoppedcallback (a different, still-undetected failure mode if it occurs).oob_teleop_hub.py, using data it already tracks) is a complementary, still-unbuilt detection point from the host's perspective.Test plan
tsc --noEmitall clean (no new errors vs.main)tests/mock/StreamAttachTimeoutTest.tsx- 4/4 deterministic PASS via Playwright🤖 Generated with Claude Code
Summary by CodeRabbit