Initial implementation by kimi k2 0905

PLANNING/asyncio_event_loop_fix.md

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+# Asyncio Event Loop Issue with Streamlit
+
+## Problem
+Error: `There is no current event loop in thread 'ScriptRunner.scriptThread'`
+
+This occurs because:
+1. Google's langchain integration uses asyncio internally
+2. Streamlit runs scripts in a separate thread (ScriptRunner.scriptThread)
+3. This thread doesn't have an asyncio event loop by default
+4. When `embed_query()` is called, it tries to use async operations but fails
+
+## Solution
+
+### Option 1: Create Event Loop for Thread (Recommended)
+Add event loop handling in the model factory:
+
+```python
+import asyncio
+import threading
+
+def _create_google_embeddings() -> GoogleGenerativeAIEmbeddings:
+    """Create Google embeddings with validation"""
+    if not config.GOOGLE_API_KEY:
+        raise ValueError("GOOGLE_API_KEY not configured")
+    
+    # Ensure event loop exists for current thread
+    try:
+        loop = asyncio.get_event_loop()
+    except RuntimeError:
+        # Create new event loop for this thread
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+    
+    embeddings = GoogleGenerativeAIEmbeddings(
+        model=config.GOOGLE_EMBEDDING_MODEL,
+        google_api_key=config.GOOGLE_API_KEY
+    )
+    
+    # Rest of validation...
+```
+
+### Option 2: Use nest_asyncio (Simple but less clean)
+Install and apply nest_asyncio at app startup:
+
+```python
+import nest_asyncio
+nest_asyncio.apply()
+```
+
+### Option 3: Synchronous Wrapper
+Create a synchronous wrapper for async operations:
+
+```python
+def sync_embed_query(embeddings, text):
+    """Synchronous wrapper for async embed_query"""
+    try:
+        loop = asyncio.get_event_loop()
+    except RuntimeError:
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+    
+    return loop.run_until_complete(embeddings.aembed_query(text))
+```
+
+## Recommended Fix
+
+Update `model_factory.py` in the `_create_google_embeddings` method to handle the event loop properly.