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Fix nbconvert handler #545

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Jun 24, 2021
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6 changes: 5 additions & 1 deletion jupyter_server/services/nbconvert/handlers.py
Original file line number Diff line number Diff line change
@@ -1,11 +1,14 @@
import json
import asyncio

from anyio.to_thread import run_sync
from tornado import web

from ...base.handlers import APIHandler


LOCK = asyncio.Lock()

class NbconvertRootHandler(APIHandler):

@web.authenticated
Expand All @@ -20,7 +23,8 @@ async def get(self):
exporters = await run_sync(base.get_export_names)
for exporter_name in exporters:
try:
exporter_class = await run_sync(base.get_exporter, exporter_name)
async with LOCK:
exporter_class = await run_sync(base.get_exporter, exporter_name)
except ValueError:
# I think the only way this will happen is if the entrypoint
# is uninstalled while this method is running
Expand Down