ohm_streaming/.sisyphus/notepads/anime-sama-player-fallback/learnings.md

2026-02-25 Task 1: Add video URL validation helper

Task: Add _test_video_url() method to AnimeSamaDownloader

What was implemented:

• Method _test_video_url(url: str) -> bool added to end of AnimeSamaDownloader class
• Downloads first 10KB using HTTP Range header (bytes=0-10240)
• 10 second timeout handling
• Returns True if HTTP 200 and data > 0 bytes
• Returns False on timeout, connection error, or empty response
• Logs all validation results

Issues encountered:

• Subagent created duplicate imports and modified unrelated files
• Had to revert changes to other files
• Had to fix duplicate logger line
• Had to revert unintended get_download_link signature change

Verification:

• Valid URL (google.com): Returns True ✓
• Timeout URL (httpbin.org/delay/20): Returns False ✓
• Method exists: True ✓

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2026-02-25 Task 2: Implement player fallback logic

Task: Add get_download_link_with_fallback() method with player priority list

What was implemented:

• Added __init__ method with cache initialization: self._working_players = {}
• Added get_download_link_with_fallback() method with:
  • Player priority list: ['vidmoly', 'sendvid', 'sibnet', 'lpayer']
  • Tries each player in order
  • Validates each URL with _test_video_url()
  • Caches working player per anime URL
  • Logs each player attempt (success/failure)
  • Returns (video_url, filename) on first success
  • Raises exception if all players fail

Verification:

• First player works: VidMoly URL returned ✓
• First fails, second works: SendVid URL returned ✓
• All fail: Exception raised ✓

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2026-02-25 Task 3: Integrate fallback into get_download_link()

Task: Update get_download_link() to use fallback for pipe-separated URLs

What was implemented:

• Modified get_download_link() to call get_download_link_with_fallback() for pipe-separated URLs
• Direct URLs (no pipe) still use existing extraction flow for performance
• Backward compatibility maintained
• Fixed target_filename parameter to match download_manager expectations

Verification:

• Pipe URL triggers fallback: True ✓
• Direct URL skips fallback: True ✓

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2026-02-25 Task 4: Add unit tests

Task: Create unit tests for fallback logic

What was implemented:

• Created tests/test_anime_sama_fallback.py with 10 tests:
  1. test_fallback_tries_players_in_priority_order
  2. test_caching_mechanism_stores_working_player
  3. test_all_players_failing_raises_exception
  4. test_test_video_url_returns_true_for_valid_url
  5. test_test_video_url_returns_false_for_invalid_url
  6. test_test_video_url_returns_false_for_empty_response
  7. test_test_video_url_returns_false_for_timeout
  8. test_test_video_url_returns_false_for_connection_error
  9. test_fallback_skips_invalid_player_url
  10. test_cache_not_used_without_anime_page_url

Verification:

• All 10 tests pass: ✓

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2026-02-25 Task 5: Integration testing

Task: Test with real Anime-Sama URLs

What was implemented:

• Downloaded Frieren S1 E1 from anime-sama.tv
• Used pipe-separated URL format
• Download completed successfully

Verification:

• Download status: COMPLETED ✓
• File size: 321MB ✓
• Fallback logic working (SendVid used) ✓