Allow langgraph's recursion_limit to be configured through env variables

Author: StreetLamb

.env.example

@@ -22,6 +22,8 @@ USERS_OPEN_REGISTRATION=False
 MAX_UPLOAD_SIZE=50_000_000
 # Sets the number of processes
 MAX_WORKERS=1
+# Controls LangGraph's recursion_limit configuration parameter. If empty, defaults to 25.
+RECURSION_LIMIT=25
 
 # llm provider keys. Add only to models that you want to use
 OPENAI_API_KEY=

backend/app/core/config.py

@@ -148,5 +148,8 @@ def _enforce_non_default_secrets(self) -> Self:
 
     MAX_UPLOAD_SIZE: int = 50_000_000
 
+    # LangGraph config
+    RECURSION_LIMIT: int = 25
+
 
 settings = Settings()  # type: ignore

backend/app/core/graph/build.py

@@ -509,7 +509,7 @@ async def generator(
 
             config: RunnableConfig = {
                 "configurable": {"thread_id": thread_id},
-                "recursion_limit": 25,
+                "recursion_limit": settings.RECURSION_LIMIT,
             }
             # Handle interrupt logic by orriding state
             if interrupt and interrupt.decision == InterruptDecision.APPROVED:

docker-compose.yml

@@ -110,6 +110,7 @@ services:
       - DENSE_EMBEDDING_MODEL=${DENSE_EMBEDDING_MODEL?Variable not set}
       - SPARSE_EMBEDDING_MODEL=${SPARSE_EMBEDDING_MODEL?Variable not set}
       - MAX_UPLOAD_SIZE=${MAX_UPLOAD_SIZE}
+      - RECURSION_LIMIT=${RECURSION_LIMIT}
       - CELERY_BROKER_URL=redis://redis:6379/0
       - CELERY_RESULT_BACKEND=redis://redis:6379/0
     build: