support systemd notify and watchdog

src/capport/api/setup.py

@@ -10,6 +10,8 @@ import capport.utils.cli
 import capport.utils.ipneigh
 import trio
 
+from capport.utils.sd_notify import open_sdnotify
+
 from .app import app
 
 
@@ -38,9 +40,19 @@ async def _run_hub(*, task_status=trio.TASK_STATUS_IGNORED) -> None:
         await app.shutdown()
 
 
+async def _setup(*, task_status=trio.TASK_STATUS_IGNORED):
+    async with open_sdnotify() as sn:
+        await sn.send('STATUS=Starting hub')
+        async with trio.open_nursery() as nursery:
+            await nursery.start(_run_hub)
+            await sn.send('READY=1', 'STATUS=Ready for client requests')
+            task_status.started()
+            # continue running hub and systemd watchdog handler
+
+
 @app.before_serving
 async def init():
     app.debug = app.my_config.debug
     app.secret_key = app.my_config.cookie_secret
     capport.utils.cli.init_logger(app.my_config)
-    await app.nursery.start(_run_hub)
+    await app.nursery.start(_setup)