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handlers.py
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handlers.py
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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
async def get(self):
try:
from nbconvert.exporters import base
except ImportError as e:
raise web.HTTPError(500, "Could not import nbconvert: %s" % e) from e
res = {}
# Some exporters use the filesystem when instantiating, delegate that
# to a thread so we don't block the event loop for it.
exporters = await run_sync(base.get_export_names)
for exporter_name in exporters:
try:
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
continue
# XXX: According to the docs, it looks like this should be set to None
# if the exporter shouldn't be exposed to the front-end and a friendly
# name if it should. However, none of the built-in exports have it defined.
# if not exporter_class.export_from_notebook:
# continue
res[exporter_name] = {
"output_mimetype": exporter_class.output_mimetype,
}
self.finish(json.dumps(res))
default_handlers = [
(r"/api/nbconvert", NbconvertRootHandler),
]