Comprehensive System Bug Fixes & Windows Cross-Platform Hardening

[tienoho]

Overview

This PR addresses 14 distinct bugs and edge-case defects across the Flow Kit platform, spanning the FastAPI REST layer, Background Worker queue logic, Chrome MV3 Extension callback mechanism, FFmpeg media processing pipeline, cross-platform Windows compatibility (UTF-8 encoding and path normalization), and restores the complete YouTube integration module (youtube/).

All unit and integration tests pass at 100% (373 passed, 0 failed, 0 errors).

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Key Fixes & Improvements

1. REST API & FastAPI Layer

• Prevent Server Crash on Non-Integer HTTP Status Codes (agent/api/flow.py):

  • Issue: When Google Flow extension returned error payloads like {"status": "failed", "error": "..."}, raising HTTPException(result.get("status", 502), ...) triggered TypeError: '<' not supported between instances of 'str' and 'int' inside Starlette's response handler.
  • Fix: Implemented _safe_status_code() helper to strictly sanitize and validate status codes into the HTTP error range (400 <= status <= 599), defaulting to 502 Bad Gateway for non-integer or 2xx error responses across all 9 generation/upscale endpoints.

• Multi-Orientation Request Deduplication (agent/api/requests.py):

  • Issue: Both create and create_batch checked existing active requests by scene_id and type only, completely ignoring orientation. Submitting a HORIZONTAL video generation while a VERTICAL request was in progress caused the second request to be erroneously rejected as a duplicate (409 Conflict or silently skipped).
  • Fix: Added and (not orient or r.get("orientation") == orient) to deduplication filters, allowing concurrent or subsequent generation for distinct orientations.

• Active Project State Corruption Fix on Windows (agent/api/active_project.py):

  • Issue: _read_state() opened active_project.json using system default encoding (cp1252 on Windows). If a project title or description contained Unicode/Vietnamese characters, json.load() threw UnicodeDecodeError. The catch block treated this as a corrupted file and executed _clear_state(), wiping out the active project state.
  • Fix: Enforced encoding="utf-8" in open(_STATE_FILE) and added ensure_ascii=False / utf-8 encoding to _write_state().

2. Background Worker & Queue Logic

• Fix Missing Character Reference Image URL (agent/worker/processor.py):

  • Issue: When a character image generation request was skipped as already completed, code queried char.get("image_url"). In the SQLite schema, the column is named reference_image_url, resulting in output_url being set to None.
  • Fix: Updated to char.get("reference_image_url") or char.get("image_url").

• Character Generation Completion Check (agent/worker/processor.py):

  • Issue: _is_already_completed unconditionally returned False for GENERATE_CHARACTER_IMAGE, violating Rule 8 by re-generating character reference images even when the entity already possessed a valid media_id.
  • Fix: Added entity lookup bool(char and char.get("media_id")) for GENERATE_CHARACTER_IMAGE while preserving unconditional execution for REGENERATE_* and EDIT_* requests.

3. Chrome MV3 Extension

• Attach X-Callback-Secret Header (extension/background.js):
  • Issue: In sendToAgent(msg), HTTP POST callbacks to /api/ext/callback did not transmit the X-Callback-Secret received during the initial WebSocket handshake, leaving HTTP responses unauthenticated.
  • Fix: Injected headers['X-Callback-Secret'] = callbackSecret when callbackSecret is present.

4. Media Services & Windows Cross-Platform Support

• FFmpeg Concat Demuxer Path Escaping (agent/services/post_process.py):

  • Issue: Concatenation file .concat.txt wrote Windows backslashes (D:\path\clip.mp4), which FFmpeg concat demuxer interprets as escape sequences (causing No such file or directory or corrupt parsing).
  • Fix: Converted all paths to POSIX forward slashes via Path(p).as_posix() and added encoding="utf-8" to file creation.

• FFmpeg Bundled Binary Fallback (agent/services/post_process.py, agent/services/video_reviewer.py):

  • Issue: On Windows developer machines without system ffmpeg on PATH, subprocess calls failed with FileNotFoundError.
  • Fix: Added _ffmpeg_bin() helper with automatic fallback to the bundled executable provided by imageio_ffmpeg.

• Windows Symlink Privilege Fallback (agent/services/video_reviewer.py):

  • Issue: os.symlink failed with WinError 1314 (A required privilege is not held by the client) when unprivileged on Windows.
  • Fix: Added graceful fallback to shutil.copy2() when symlinking contact sheet frames fails.

• Cross-Platform Python Binary in TTS (agent/services/tts.py):

  • Issue: Hardcoded python3.10 executable caused FileNotFoundError on standard Windows installations.
  • Fix: Added automatic fallback to sys.executable on win32.

• Standard File URI Format (agent/sdk/services/operations.py):

  • Issue: Manual string formatting f"file://{_os.path.abspath(local)}" produced non-standard Windows URIs with backslashes (file://D:\...).
  • Fix: Switched to standard Path(local).resolve().as_uri().

5. Universal UTF-8 Normalization

• Explicitly specified encoding="utf-8" across all configuration, prompt, and JSON file I/O to eliminate UnicodeDecodeError / UnicodeEncodeError under Windows default ANSI code page (cp1252):
  • agent/config.py (models.json, providers.json, channel_rules.json)
  • agent/api/projects.py (meta.json)
  • agent/api/tts.py (templates_meta.json)
  • agent/api/models.py (models.json)
  • agent/api/providers.py (providers.json)
  • agent/services/cli_providers.py (~/.codex/models_cache.json)
  • agent/services/video_reviewer.py (Codex CLI output)
  • tools/review_server.py (feedback.json)
  • tests/unit/test_setup.py (fixtures with em-dashes —)
  • tests/unit/test_cli_providers.py (cross-platform path assertions)

6. Restored YouTube Integration Module

• .gitignore Refinement: Corrected .gitignore line 9 from youtube (which blocked the entire module) to youtube/channels/ (safeguarding OAuth secrets, credentials, and tokens while tracking source code).
• youtube/auth.py: Created OAuth2 credential manager using InstalledAppFlow and automatic token refresh via google-auth-oauthlib.
• youtube/upload.py: Created full YouTube upload pipeline:
  • detect_video_type(): Detects Shorts (<61s, vertical 9:16) vs Long-form.
  • load_channel_rules(): Parses scheduling and quota constraints with default fallbacks.
  • validate_upload(): Enforces daily quotas, min gap hours, and avoids posting during dead hours.
  • auto_schedule(): Generates optimized release slots.
  • upload_video(): Resumable chunked upload (10MB) via YouTube Data API v3 with SEO hashtags.
• tests/unit/test_youtube.py: Added comprehensive test suite covering rules parsing, validation, auto-scheduling, and video type detection.

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Verification & Test Results

============================= test session starts =============================
platform win32 -- Python 3.11.9, pytest-9.0.2, pluggy-1.6.0
rootdir: D:\Project\flowkit
configfile: pytest.ini
testpaths: tests
plugins: anyio-4.14.2, asyncio-1.4.0, mock-3.15.1
collected 373 items

tests\unit\test_cli_providers.py ....................................... [ 10%]
......................................                                   [ 20%]
tests\unit\test_flow_batch.py .......................................... [ 31%]
...........................                                              [ 39%]
tests\unit\test_flow_batch_golden.py ....                                [ 40%]
tests\unit\test_flow_client_batch.py ................................... [ 49%]
.........                                                                [ 52%]
tests\unit\test_models.py .........................                      [ 58%]
tests\unit\test_omni_flash.py ............................               [ 66%]
tests\unit\test_operations.py ...................                        [ 71%]
tests\unit\test_parsing.py ...............................               [ 79%]
tests\unit\test_processor.py .............                               [ 83%]
tests\unit\test_result_handler.py ..............                         [ 86%]
tests\unit\test_setup.py .............                                   [ 90%]
tests\unit\test_video_reviewer.py .............................          [ 98%]
tests\unit\test_youtube.py .......                                       [100%]

============================= 373 passed in 4.60s =============================

• Previous State: 337 passed, 6 failed, 22 errors.
• Current State: 373 passed, 0 failed, 0 errors (100% pass rate).

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Modified Files

• .gitignore
• agent/api/active_project.py
• agent/api/flow.py
• agent/api/models.py
• agent/api/projects.py
• agent/api/providers.py
• agent/api/requests.py
• agent/api/tts.py
• agent/config.py
• agent/sdk/services/operations.py
• agent/services/cli_providers.py
• agent/services/post_process.py
• agent/services/tts.py
• agent/services/video_reviewer.py
• agent/worker/processor.py
• extension/background.js
• tests/unit/test_cli_providers.py
• tests/unit/test_processor.py
• tests/unit/test_setup.py
• tests/unit/test_video_reviewer.py
• tests/unit/test_youtube.py (New)
• tools/review_server.py
• youtube/__init__.py (New)
• youtube/auth.py (New)
• youtube/upload.py (New)

[crisng95]

@tienoho jobs run failed