Add backend flag to keep alive

jhub_apps/__about__.py

@@ -1 +1 @@
-__version__ = "2024.4.1rc7"
+__version__ = "2024.4.1rc8"

jhub_apps/service/models.py

@@ -63,6 +63,9 @@ class UserOptions(BaseModel):
  profile: typing.Optional[str] = str()
  # Make app available to public (unauthenticated Hub users)
  public: typing.Optional[bool] = False
+ # Keep app alive, even when there is no activity
+ # So that it's not killed by idle culler
+ keep_alive: typing.Optional[bool] = False
 
 
 class ServerCreation(BaseModel):

jhub_apps/spawner/command.py

@@ -55,7 +55,6 @@ def get_substituted_args(self, **kwargs):
  "-m",
  "jhsingle_native_proxy.main",
  TString("--authtype=$authtype"),
- "--no-force-alive",
  ]
 )
 

jhub_apps/spawner/spawner_creation.py

@@ -102,6 +102,17 @@ async def start(self):
  python_exec=self.config.JAppsConfig.python_exec,
  authtype=auth_type,
  )
+ # Only for non-JupyterLab apps
+ if self.user_options.get("keep_alive"):
+ logger.info(
+ "Flag set to force keep alive, will not be deleted by idle culler",
+ app=self.user_options.get("display_name"),
+ framework=self.user_options.get("framework")
+ )
+ self.cmd.append("--force-alive")
+ else:
+ self.cmd.append("--no-force-alive")
+
  if framework == Framework.jupyterlab.value:
  self.cmd = [
  self.config.JAppsConfig.python_exec,