chore(examples): convert camera-display to the Python app model - #1967
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Scaffolded with `streamlib new`, then adapted to camera → display. The retired Rust app was already dead code: `processor_type_ref!`, `RunnerAutoBuild` and `Runner::with_auto_build` no longer exist anywhere in sdk/ or runtime/, and the crate was never a root-workspace member. Rebuild the E2E fixture around `streamlib run`. It now gates on the control plane's graph JSON, a captured window, and a clean SIGTERM exit rather than on engine tracing prose. The prose it used to grep — "Ring textures created", "First frame captured", "Failed to create camera texture" — greps absent in the engine tree, so the gate would have reported FAIL on a healthy run. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe camera-display example now uses a Python StreamLib app with built-in camera and display processors. Its E2E fixture validates graph contracts, captures the display window, checks runtime errors, and verifies shutdown. ChangesCamera-display migration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The updated end-to-end fixture can accept an incorrectly wired camera-to-window graph and can hang indefinitely when shutdown does not complete, allowing integration failures to be misreported or CI to stall. These bounded test-harness issues should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant CLI as streamlib CLI
participant App as camera-display app
participant Camera as CameraSource
participant Display as DisplayWindow
participant Capture as xdotool/xwd/PIL
CLI->>App: Start Python application
App->>Camera: Add camera source
App->>Display: Add display window
Camera->>Display: Connect video output
CLI->>Capture: Capture composited window
Capture-->>CLI: Return PNG dimensions
CLI->>App: Send SIGTERM
App-->>CLI: Return shutdown status and logs
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (6 skipped: 6 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@runtime/streamlib-engine/tests/fixtures/e2e_camera_display.sh`:
- Around line 163-177: Update the graph validation around nodes, types, and
links to resolve the IDs for CameraSource and DisplayWindow, then require a link
directed from the camera’s video output to the window’s video input. Keep the
existing missing-node diagnostic, but report failure instead of “ok” for absent,
reversed, unrelated, or incorrectly ported links.
- Around line 203-210: Update the shutdown handling around the NODE_PID polling
loop and wait so that when SHUTDOWN_STATUS remains timeout, the child is
forcefully terminated with SIGKILL and reaped before result analysis; preserve
the existing clean-shutdown path.
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📒 Files selected for processing (11)
docs/learnings/README.mddocs/learnings/camera-display-e2e-validation.mdexamples/camera-display/.gitignoreexamples/camera-display/.python-versionexamples/camera-display/Cargo.tomlexamples/camera-display/README.mdexamples/camera-display/app.pyexamples/camera-display/pyproject.tomlexamples/camera-display/setup.shexamples/camera-display/src/main.rsruntime/streamlib-engine/tests/fixtures/e2e_camera_display.sh
💤 Files with no reviewable changes (3)
- examples/camera-display/Cargo.toml
- examples/camera-display/setup.sh
- examples/camera-display/src/main.rs
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Two review findings, both real. The graph check reported `ok` when both block types existed and any link existed, so a reversed link, a link on the wrong port, or a link to an unrelated processor all passed — the exact wiring bug the fixture is for. It now resolves both processor ids and requires a link from the camera's `video` output to the window's `video` input. `wait` on a node that ignores SIGTERM blocks forever, and the EXIT trap cannot fire while the script is blocked in it, so the fixture hung instead of reporting the shutdown failure it had just detected. Escalate to SIGKILL inline before reaping. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Review dispositionBoth inline findings were real and are fixed in 8974dff — replies in-thread. Re-ran the fixture live on the rig afterwards: Declining: Docstring Coverage 33.33%The uncovered function is It would break scaffold parity. This example's whole claim is that it is what def setup(rt: Runtime) -> None:
source = rt.add(CameraSource)No docstring — and the entry file already carries a module docstring explaining what It would restate the code. If the threshold should apply to |
1 participant
Converts
examples/camera-displayto the Python-forward model, starting from a realstreamlib newscaffold, and retires the Rust approach. Rebuilds the E2E fixture that drives it.The example
Scaffolded with
streamlib new, then adapted to pure camera → display — the scaffold'sInvertingEffectandprocessors/dropped, since the example's whole content is two native built-ins wired together.numpycame out of the dependency list with it; nothing imports it now.STREAMLIB_CAMERA_DEVICEsurvives as the one runtime knob, because an automated fixture needs to select a capture device without editing the app. The oldmax_width/max_heightenv plumbing became literal config — edit and re-run is the model.Removed:
src/main.rs,Cargo.toml,setup.sh, plus untracked.cargo/,.streamlib/,Cargo.lock,streamlib.lock,target/, and two stalestreamlib_modules/@tatolab/*symlinks.The retired app was already dead code, not merely dated —
processor_type_ref!,RunnerAutoBuildandRunner::with_auto_buildgrep absent acrosssdk/andruntime/, and the crate was never a root-workspace member. Nothing that currently works depended on it compiling.The fixture
e2e_camera_display.shnow boots the app withstreamlib run(no build step), waits for the node to register, asserts againststreamlib graph, captures the window, and requires a clean SIGTERM exit.The change that matters is what it asserts on. It used to grep engine tracing prose —
Ring textures created,First frame captured,Failed to create camera texture— none of which exist in the engine tree. Combined with building a crate that no longer compiles, the gate was vacuous: it would have reported FAIL on a perfectly healthy run. It now gates on the graph JSON, process exit status, driver-owned Vulkan error strings, and pixels. Our owntracingmessages are not a test API.Window capture prefers ImageMagick
import, falling back tocapture_window.py— that fallback needs PIL in whicheverpython3wins on PATH, which is not the wheel venv.E2E Test Report
examples/camera-displayviae2e_camera_display.sh/dev/video0(vivid)Log signals
OUT_OF_DEVICE_MEMORY: 0 (pass)DEVICE_LOST: 0 (pass)process() failed: 0 (pass)Validation Error: 0[stop] Graceful shutdown complete— clean on SIGTERM, no SIGKILL neededPNG samples
/tmp/streamlib-e2e-final/png_samples/1920x1080, input 0,brightness 128, contrast 128, saturation 128, hue 0and timecode00:00:05:608. Colour order is correct (red bar red, blue bar blue — no R↔B swap). Not black, not uniform, not stale.The captured window. Uploaded lossless rather than the usual JPEG step — colour fidelity is the assertion here, and JPEG chroma subsampling would undermine the very R↔B check the image exists to prove.
Also verified:
streamlib nodesclean afterwards, no stranded processes.ship-change-removed-gate.test.sh37 passed / 0 failed.Deliberately not in this diff
.claude/files → #1966..claude/rules/flow.mdrequires operating-model changes to be their own PR and forbids a session editing the agents, rules or skills it is itself using — this session usedverify-liveandrig-brake. Soverify-live/SKILL.md(four dead display env vars),rig-brake.sh(watchescargo run -p camera-display),evidence-verifier.mdand twoagent-knowledgeindex files still describe the retired harness. Filed with the measurements behind the replacement design.The three PSNR fixtures.
e2e_fixture_psnr.sh,_jpegand_vividcarry identical rot, but converting them needsvulkan-video-psnr/jpeg-psnr/vulkan-video-roundtripin Python, which needs codec blocks — a named engine gap blocking consumer conversion. Half-converting them would produce three more vacuous gates.Notes, not asks
DisplayWindowscaling: "fit"appears to left-align rather than centre. Visible as asymmetric letterboxing in the captured frame. Pre-existing, unrelated to this change, and uninvestigated — a lead, not a diagnosis.pgzkx96imh0emnguea13jjhfm/video), never its display name. A display name fails with "no tappable channel named". The README now derives it fromgraph, and that incantation was run verbatim against a live node before it went in.surface_id,width,height,timestamp_ns,color_info. Relevant to how the harness evolves; discussed on chore(loop): retarget the verify-live harness docs at the Python camera-display path #1966.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Documentation
Tests