Add fixed singleuser command script

pyproject.toml

@@ -8,6 +8,9 @@ readme = "README.md"
 repository = "https://gitlab.univ-nantes.fr/glicid/jupyter/spawner"
 packages = [{ include = "glicid_spawner", from = "src"}]
 
+[tool.poetry.scripts]
+glicid-spawner-singleuser = 'glicid_spawner.singleuser:main'
+
 [tool.poetry.plugins."jupyterhub.spawners"]
 glicid-spawner = 'glicid_spawner:GlicidSpawner'
 

src/glicid_spawner/singleuser.py

@@ -0,0 +1,38 @@
+"""Patched JupyterHub singleuser command script.
+
+Fix based on batchspawner#250:
+    https://github.com/jupyterhub/batchspawner/pull/250
+
+The Hub API should use an async call.
+
+"""
+
+import asyncio
+import json
+import sys
+from runpy import run_path
+from shutil import which
+
+from jupyterhub.services.auth import HubAuth
+from jupyterhub.utils import random_port, url_path_join
+
+
+def main(argv=None):
+    port = random_port()
+    hub_auth = HubAuth()
+
+    asyncio.run(
+        hub_auth._api_request(
+            method='POST',
+            url=url_path_join(hub_auth.api_url, 'batchspawner'),
+            body=json.dumps({'port': port}),
+        )
+    )
+
+    cmd_path = which(sys.argv[1])
+    sys.argv = sys.argv[1:] + [f'--port={port}']
+    run_path(cmd_path, run_name='__main__')
+
+
+if __name__ == '__main__':
+    main()