80 lines
3.6 KiB
Markdown
80 lines
3.6 KiB
Markdown
# Update Feature Fixes - Final Summary
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## Problem Identified
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The update feature was causing the application to hang indefinitely when clicked. The issue had two components:
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1. **UI Thread Blocking**: The original code was running download operations synchronously on the UI thread
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2. **Network Timeout Issues**: Even with timeouts set, the socket-level network calls would hang indefinitely if the server didn't respond
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## Solutions Implemented
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### 1. Background Threading (First Fix)
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- Created `UpdateDownloadWorker` class to run download operations in a background thread
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- Moved blocking network calls off the UI thread
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- This prevents the UI from freezing while waiting for network operations
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### 2. Aggressive Timeout Strategy (Second Fix)
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Applied timeouts at multiple levels to ensure the app never hangs:
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#### A. Socket-Level Timeout (Most Important)
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- **File**: `src/webdrop_bridge/core/updater.py`
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- Reduced `urlopen()` timeout from 10 seconds to **5 seconds**
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- This is the first line of defense against hanging socket connections
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- Applied in `_fetch_release()` method
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#### B. Asyncio-Level Timeout
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- **File**: `src/webdrop_bridge/ui/main_window.py` and `src/webdrop_bridge/core/updater.py`
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- `UpdateCheckWorker`: 10-second timeout on entire check operation
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- `UpdateDownloadWorker`: 300-second timeout on download, 30-second on verification
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- `check_for_updates()`: 8-second timeout on async executor
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- These catch any remaining hangs in the asyncio operations
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#### C. Qt-Level Timeout (Final Safety Net)
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- **File**: `src/webdrop_bridge/ui/main_window.py`
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- Update check: **30-second QTimer** safety timeout (`_run_async_check()`)
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- Download: **10-minute QTimer** safety timeout (`_perform_update_async()`)
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- If nothing else works, Qt's event loop will forcefully close the operation
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### 3. Error Handling Improvements
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- Added proper exception handling for `asyncio.TimeoutError`
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- Better logging to identify where hangs occur
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- User-friendly error messages like "no server response" or "Operation timed out"
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- Graceful degradation: operations fail fast instead of hanging
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## Timeout Hierarchy (in seconds)
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```
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Update Check Flow:
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QTimer safety net: 30s ─┐
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├─ Asyncio timeout: 10s ─┐
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├─ Socket timeout: 5s (first to trigger)
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Download Flow:
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QTimer safety net: 600s ─┐
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├─ Asyncio timeout: 300s ─┐
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├─ Socket timeout: 5s (first to trigger)
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```
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## Files Modified
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1. **src/webdrop_bridge/ui/main_window.py**
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- Updated `UpdateCheckWorker.run()` with timeout handling
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- Updated `UpdateDownloadWorker.run()` with timeout handling
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- Added QTimer safety timeouts in `_run_async_check()` and `_perform_update_async()`
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- Proper event loop cleanup in finally blocks
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2. **src/webdrop_bridge/core/updater.py**
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- Reduced socket timeout in `_fetch_release()` from 10s to 5s
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- Added timeout to `check_for_updates()` async operation
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- Added timeout to `download_update()` async operation
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- Added timeout to `verify_checksum()` async operation
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- Better error logging with exception types
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## Testing
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- All 7 integration tests pass
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- Timeout verification script confirms all timeout mechanisms are in place
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- No syntax errors in modified code
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## Result
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The application will no longer hang indefinitely when checking for or downloading updates. Instead:
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- Operations timeout quickly (5-30 seconds depending on operation type)
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- User gets clear feedback about what went wrong
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- User can retry or cancel without force-killing the app
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- Background threads are properly cleaned up to avoid resource leaks
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