No current event loop in thread

[RegisGraptin]

When using the SDK in a thread mode, by using with FastAPI or Streamlit (in my case), I encounter the following issue:

   ...
  File "/.../secret-ai-getting-started/src/secret/secret_chat_server.py", line 29, in __init__
    secret_client = Secret(
                    ^^^^^^^
  File "/.../secret-ai-getting-started/.venv/lib/python3.12/site-packages/secret_ai_sdk/secret.py", line 35, in __init__
    self.secret_client = LCDClient(chain_id=self.chain_id, url=self.node_url)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/.../secret-ai-getting-started/.venv/lib/python3.12/site-packages/secret_sdk/client/lcd/lcdclient.py", line 289, in __init__
    loop=nest_asyncio.apply(get_event_loop()),
                            ^^^^^^^^^^^^^^^^
  File "/.../.pyenv/versions/3.12.7/lib/python3.12/asyncio/events.py", line 702, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'ScriptRunner.scriptThread'.

The fix I used was to modify the lcdclient.py file with:

+from asyncio import AbstractEventLoop, get_event_loop, TimeoutError, new_event_loop, set_event_loop

...

def __init__(
        self,
        url: str,
        chain_id: str = None,
        gas_prices: Optional[Coins.Input] = default_gas_prices,
        gas_adjustment: Optional[Numeric.Input] = default_gas_adjustment,
        custom_fees: Optional[dict] = default_fees,
        _request_config: Optional[dict] = REQUEST_CONFIG
    ):
        self.lock = Lock()

+         try:
+            loop = get_event_loop()
+        except RuntimeError:
+            loop = new_event_loop()
+            set_event_loop(loop)
        
+        loop = nest_asyncio.apply(loop)

        super().__init__(
            url,
            chain_id,
            gas_prices,
            gas_adjustment,
            custom_fees,
            _create_session=False,
+            loop=loop,
            _request_config=_request_config
        )

Not fully familiar on how the SDK should handle the co-routine. May missed some stuff here, but wanted to highlight the issue when using it with FastAPI for instance.

[jeugregg]

Hi!, in my case, With streamlit, I only have add this 2 lines before declaring LCDClient :

# 
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
#
secret = LCDClient(chain_id=chain_id, url=node_rest_endpoint)