sayance-matrix-native-module/SYNC_FIXES.md

Native Matrix client module for Expo using Rust SDK

# Sayance Matrix Native Module - Sync Fixes

## Issues Identified and Fixed

### 1. **Missing Tracing/Logging Initialization**
**Problem**: The Rust code had extensive `tracing::info!()` and `tracing::error!()` calls, but tracing was never initialized, so no logs were visible.

**Fix**: 
- Added `init_tracing()` function that initializes tracing-subscriber
- Added both `tracing` logs and `eprintln!` logs for immediate visibility
- Enhanced Cargo.toml to include required tracing-subscriber features

### 2. **Sync Service State Monitoring Issues**
**Problem**: The SyncService state stream wasn't being properly consumed, and async tasks had no error handling or timeouts.

**Fix**:
- Added timeout handling to SyncService.start() call
- Improved state stream monitoring with proper error handling
- Added debug logging to track state transitions
- Used tokio::time::timeout for better async task management

### 3. **Session Restoration Problems**
**Problem**: Matrix SDK 0.12 session restoration might fail silently without proper error handling.

**Fix**:
- Added comprehensive error handling for session restoration
- Added authentication verification after session restoration  
- Enhanced logging to track session restoration process
- Added proper device ID generation and validation

### 4. **Event Broadcasting Issues** 
**Problem**: Event broadcasting had minimal error handling and debugging.

**Fix**:
- Enhanced broadcast_event function with detailed logging
- Added error handling for broadcast channel operations
- Improved callback execution logging
- Added debug information for event flow

### 5. **Callback Registration Timing**
**Problem**: Race conditions between callback registration and sync start.

**Fix**:
- Enhanced callback registration logging
- Added verification of client authentication before sync start
- Improved error messages for debugging

## Key Changes Made

### Rust Code (lib.rs)
1. **Added `init_tracing()` function** for proper logging setup
2. **Enhanced `initialize_client_async()`** with better error handling and logging
3. **Improved `start_sync()`** with:
   - Client authentication verification
   - Timeout handling for SyncService operations
   - Better async task management
   - Enhanced state monitoring
4. **Enhanced `broadcast_event()`** with comprehensive logging
5. **Updated Cargo.toml** to include proper tracing features

### Expected Log Output
After the fixes, you should see logs like:
```
🚨 STARTING MATRIX SYNC SERVICE 🚨
✅ Client found in global state  
👤 Client authenticated as: @user:matrix.org
✅ SyncService found in global state
🚀 Starting SyncService with sliding sync support
🔧 Calling SyncService.start()...
✅ SyncService.start() completed successfully
🔍 Starting sync state monitoring...
🏃 SyncService is running and syncing!
🔔 BROADCASTING SYNC STATE: SYNCING
🔥 CALLING SYNC UPDATE CALLBACK: SYNCING
```

## Testing Steps

1. **Rebuild the native module**:
   ```bash
   chmod +x test_sync.sh
   ./test_sync.sh
   ```

2. **Run your React Native app** and check console output

3. **Look for key indicators**:
   - Authentication verification logs
   - SyncService state changes  
   - Event broadcasting logs
   - Callback execution logs

## Troubleshooting Guide

### If you still don't see sync working:

1. **Check Authentication**:
   - Verify access token is valid and not expired
   - Check that user ID format is correct
   - Ensure homeserver URL is reachable

2. **Check Network Connectivity**:
   - Verify the homeserver is accessible 
   - Check for firewall/proxy issues
   - Test with a simple Matrix client to confirm server connectivity

3. **Check Device Authentication**:
   - Verify device ID is valid
   - Check if device needs to be verified
   - Look for device-related error messages

4. **Check Storage**:
   - Verify storage path is writable
   - Check for SQLite database corruption
   - Try clearing storage and re-authenticating

### Expected vs Actual Behavior

**Before fixes**:
- No logs visible from Rust layer
- Sync service state unknown
- Silent failures in authentication/sync

**After fixes**:
- Comprehensive logging at every step
- Clear error messages for failures  
- Visibility into sync service state transitions
- Proper callback execution tracking

## Matrix SDK 0.12 Considerations

The fixes account for Matrix SDK 0.12 specifics:
- Proper session restoration API usage
- SyncService state monitoring patterns
- Event handler registration timing
- Authentication verification methods

## Next Steps

1. Test with the rebuilt module
2. Monitor console logs for the expected output
3. If issues persist, the enhanced logging will help identify the root cause
4. Consider upgrading to newer Matrix SDK versions if compatibility issues arise

## Contact

If you continue experiencing issues after these fixes, the enhanced logging should provide specific error messages that can help identify the remaining problems.