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feat: Electron desktop wrapper for macOS app distribution#3

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swongvsa merged 8 commits intomainfrom
feat/electron-desktop-wrapper
Apr 2, 2026
Merged

feat: Electron desktop wrapper for macOS app distribution#3
swongvsa merged 8 commits intomainfrom
feat/electron-desktop-wrapper

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@swongvsa swongvsa commented Mar 4, 2026 •
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Summary

FastAPI + Electrobun desktop wrapper (v0.2.0)

This branch replaces the Gradio web UI with a native macOS .app bundle. Non-technical operators double-click to open — no Python, pip, or terminal required.

Backend

  • New src/ui/server.py: FastAPI replacing Gradio. MJPEG live preview, camera API, clip download, all on 127.0.0.1 only (no LAN exposure).
  • /api/config endpoint — single source of truth for ROI options and slowdown presets. Frontend no longer duplicates hardware constants.
  • Clips saved to ~/Movies/High Speed Camera/ (persistent across app updates).
  • CORS restricted to views:// and localhost origins (was wildcard).

Desktop wrapper

  • desktop/src/bun/index.ts: Electrobun main process replaces Electron. Spawns Python, polls /api/status for readiness, shows error screen with Close button on failure.
  • desktop/scripts/build.sh: hermetic build pipeline — python-build-standalone ARM64 + uv + bun. Removes com.apple.quarantine from libmvsdk.dylib so Gatekeeper doesn't block it.
  • Clips dir, port retry (50 ms after kill), error splash all handled.

Reliability fixes (from adversarial review)

  • Atomic clip write: .tmp → rename on success. No corrupt files if killed mid-save.
  • Recording thread non-daemon: SIGTERM waits up to 10 s for H.264 encoder flush.
  • MJPEG generator exits on GeneratorExit — no leaked generators accumulating after reconnects.
  • Record poll resets to idle after 20 s (no permanent "Saving..." lock if Python crashes).
  • Ring buffer keeps newest frames when target FPS is reduced (was keeping oldest).
  • Settings response now read from data.settings.* (was data.* — always undefined).
  • Buffer bar denominator syncs from server each poll.

Tests

  • Remove 4 stale test files that imported deleted Gradio modules.
  • Add tests/integration/test_server_api.py: 19 tests covering all FastAPI endpoints.
  • 100/100 tests passing.

Test Coverage

All new server endpoints have integration tests. TypeScript/JS frontend code is not unit tested (expected — no browser test framework configured; the WKWebView renders are verified manually).

Tests: 81 → 100 (+19 new)

CODE PATH COVERAGE
===========================
FastAPI server endpoints: /api/status, /api/config, /api/cameras,
  /api/settings (7 validation tests), /api/record lifecycle,
  /api/record/status, /api/record/download — all covered
run_server() host binding: covered (source inspection test)

Pre-Landing Review

No issues found. All adversarial findings fixed (7 auto-fixed + 4 user-approved).

Design Review

No frontend framework changes — custom HTML/JS/CSS served via views://. No design review tool applicable.

Adversarial Review

13 findings from Claude subagent:

Auto-fixed:

  • [AUTO-FIXED] highspeed_recorder.py:107 — ring buffer drops newest on FPS shrink → slice tail before resize
  • [AUTO-FIXED] app.js:447 — settings parsed from wrong path (data.X → data.settings.X)
  • [AUTO-FIXED] app.js:495 — bufferTargetSec hardcoded 10 → synced from server each poll

User-approved fixes:

  • [FIXED] Atomic clip write (.tmp → rename) — highspeed_recorder.py
  • [FIXED] Non-daemon recording thread + SIGTERM join(10s) — server.py
  • [FIXED] MJPEG generator GeneratorExit cleanup — server.py
  • [FIXED] Record poll 20 s timeout with idle reset — app.js
  • [FIXED] CORS wildcard → views:// + localhost only — server.py

Scope Drift

Scope: CLEAN
Intent: replace Electron + Gradio with Electrobun + FastAPI for macOS distribution
Delivered: exactly that, plus reliability fixes surfaced by adversarial review

Plan Completion

No formal plan file. Design doc at ~/.gstack/projects/high-speed-camera-testing/swong-feat-electron-desktop-wrapper-design-20260331-161613.md. All code items implemented. Two deferred items (hardware test on clean Mac, DMG creation) tracked in TODOS.md.

TODOS

Created TODOS.md:

  • P1: End-to-end test on clean ARM64 Mac
  • P2: DMG creation step in build.sh
  • P2: Code signing / notarization
  • Completed: all items implemented in this PR (v0.2.0)

Test plan

  • All Python tests pass (100/100, 15.76s)
  • All fixes verified by re-running test suite after each change
  • No new test failures introduced

🤖 Generated with Claude Code

swongvsa and others added 8 commits March 4, 2026 16:36
@swongvsa @claude
feat: add Electron desktop wrapper for macOS app distribution
f4d8aa9 
- Add desktop/ directory with Electron shell that spawns the Python/Gradio
  subprocess and embeds the UI in a native window (no browser tabs)
- Splash screen shown during Python startup; window revealed once Gradio
  is ready; closing the window terminates the Python process cleanly
- Port-fallback logic tries 7860-7862 in order
- electron-builder config targets ARM64 DMG for internal distribution
- scripts/build.sh automates bundling Python runtime + dependencies
- Set ELECTRON_RUN=1 env var so main.py suppresses Gradio's inbrowser
  auto-launch when running inside Electron
- Add desktop build artifacts to .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa @claude
feat: replace Gradio with FastAPI HTTP service
91b4401 
- New FastAPI server (src/ui/server.py): camera API, MJPEG stream,
  clip download, all bound to 127.0.0.1 only
- /api/config endpoint for ROI options and slowdown presets
- /api/status returns buffer stats, FPS, connection state
- CORS restricted to views:// and localhost origins only
- Clips stored in ~/Movies/High Speed Camera/ via HSCAM_CLIPS_DIR env var
- MJPEG generator exits cleanly on client disconnect (GeneratorExit)
- Recording thread is non-daemon; SIGTERM waits up to 10 s for flush
- Atomic clip write: .tmp file renamed on success, no corrupt files on kill
- Ring buffer keeps most-recent frames when target FPS is reduced
- Remove Gradio modules: app.py, session.py, errors.py, lifecycle.py
- Switch to opencv-python-headless (no Qt GUI needed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa @claude
feat: add custom web UI (HTML/JS/CSS)
9476e1e 
Serves via Electrobun views:// scheme — no browser URL bar.
- ROI presets and slowdown controls loaded from /api/config on startup
- MJPEG stream preview via <img src="/stream">
- Blob URL download for WKWebView compatibility
- Buffer bar denominator syncs from clip_duration_sec each poll
- Settings response correctly parsed from data.settings.*
- Record poll resets to idle after 20 s timeout (no infinite-saving hang)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa @claude
feat: replace Electron with Electrobun desktop wrapper
df2a1ea 
Electrobun uses Bun/TypeScript for the main process and WKWebView for the UI.
- index.ts: spawn Python/FastAPI, poll /api/status for readiness,
  inject active port, handle startup failure with visible error screen
- build.sh: full pipeline — python-build-standalone + uv + bun build;
  removes com.apple.quarantine from libmvsdk.dylib so Gatekeeper doesn't block it
- Clips stored in ~/Movies/High Speed Camera/ (HSCAM_CLIPS_DIR env var)
- Port retry: 50 ms sleep after kill so OS releases socket before next attempt
- Remove old Electron files: main.js, electron-builder.yml, package-lock.json
- Splash window relocated to desktop/src/splash/index.html

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa @claude
test: replace stale Gradio tests with FastAPI server test suite
8ade447 
- Add tests/integration/test_server_api.py: 19 tests covering
  /api/status, /api/config, /api/cameras, /api/settings validation,
  /api/record lifecycle, and localhost binding assertion
- Remove tests that imported deleted Gradio modules:
  test_scenario_02_single_viewer.py (ViewerSession)
  test_scenario_05_localhost.py (launch_app)
  test_viewer_session_contract.py (session module)
  test_gradio_ui_contract.py (Gradio UI contract)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa @claude
chore: rename openspec → opsx skill/command across all IDE integrations
6bffe01 
Updates .claude, .cursor, .cline, .gemini, .github, .amazonq, .kilocode,
.opencode, .qwen, .windsurf, and .clinerules with the opsx skill set
(explore, propose, apply, archive). Removes the old openspec command files.
Also updates AGENTS.md, CLAUDE.md, CLINE.md, adds QWEN.md, and adds
openspec/ design/spec documents for the Gradio → FastAPI migration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa @claude
chore: bump version to 0.2.0, add CHANGELOG and TODOS
f563d37 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@swongvsa
docs: update desktop/README.md for Electrobun (was Electron + Gradio)
c5e4ed3
@swongvsa swongvsa merged commit 0b7b9b9 into main Apr 2, 2026
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@swongvsa