modified: blueprints/chat.py

modified:   services/llm_service.py
	modified:   services/rag_service.py
	modified:   static/js/chat.js

blueprints/chat.py

@@ -47,6 +47,22 @@ def get_messages(session_id):
     return jsonify([m.to_dict() for m in session.messages])
 
 
+# ── Diagnostics ─────────────────────────────────────────────────────────────
+
+@chat_bp.route("/ping-llm", methods=["GET"])
+@login_required
+def ping_llm():
+    """Test LM Studio connectivity. Returns config + a short completion."""
+    url = current_app.config.get("LM_STUDIO_URL", "")
+    model = current_app.config.get("LM_STUDIO_MODEL", "")
+    embed_model = current_app.config.get("LM_STUDIO_EMBEDDING_MODEL", "")
+    try:
+        reply = llm_service.ask(user_message="Reply with exactly: OK", context_chunks=[], history=[])
+        return jsonify({"status": "ok", "reply": reply, "url": url, "model": model, "embed_model": embed_model})
+    except Exception as e:
+        return jsonify({"status": "error", "error": str(e), "url": url, "model": model, "embed_model": embed_model}), 502
+
+
 # ── Main chat ────────────────────────────────────────────────────────────────
 
 @chat_bp.route("/sessions/<int:session_id>/ask", methods=["POST"])
@@ -64,31 +80,33 @@ def ask(session_id):
     doc_ids = [r["id"] for r in context_refs if r.get("type") == "doc"]
     url_ids = [r["id"] for r in context_refs if r.get("type") == "url"]
 
-    # RAG lookup
+    # RAG lookup — failures are non-fatal (chat continues without context)
     chunks = []
-    if doc_ids:
-        chunks += rag_service.similarity_search(
-            query=message,
-            user_id=current_user.id,
-            source_ids=doc_ids,
-            source_type="doc",
-            top_k=current_app.config["RAG_TOP_K"],
-        )
-    if url_ids:
-        chunks += rag_service.similarity_search(
-            query=message,
-            user_id=current_user.id,
-            source_ids=url_ids,
-            source_type="url",
-            top_k=current_app.config["RAG_TOP_K"],
-        )
-    # If no specific ids given, search all user context
-    if not context_refs:
-        chunks = rag_service.similarity_search(
-            query=message,
-            user_id=current_user.id,
-            top_k=current_app.config["RAG_TOP_K"],
-        )
+    try:
+        if doc_ids:
+            chunks += rag_service.similarity_search(
+                query=message,
+                user_id=current_user.id,
+                source_ids=doc_ids,
+                source_type="doc",
+                top_k=current_app.config["RAG_TOP_K"],
+            )
+        if url_ids:
+            chunks += rag_service.similarity_search(
+                query=message,
+                user_id=current_user.id,
+                source_ids=url_ids,
+                source_type="url",
+                top_k=current_app.config["RAG_TOP_K"],
+            )
+        if not context_refs:
+            chunks = rag_service.similarity_search(
+                query=message,
+                user_id=current_user.id,
+                top_k=current_app.config["RAG_TOP_K"],
+            )
+    except Exception as e:
+        current_app.logger.warning(f"RAG lookup failed, continuing without context: {e}")
 
     # Build history (last 10 messages for context window)
     history = [