Fix sdnotify with acme enabled (#6571)

If acme was enabled, the sdnotify startup hook would never be run because we
would try to add it to a hook which had already fired.

There's no need to delay it: we can sdnotify as soon as we've started the
listeners.

2 files changed, 8 insertions, 3 deletions

diff --git a/changelog.d/6571.bugfix b/changelog.d/6571.bugfix
new file mode 100644

index 0000000000..e38ea7b4f7
--- /dev/null
+++ b/changelog.d/6571.bugfix
@@ -0,0 +1 @@
+Fix a bug which meant that we did not send systemd notifications on startup if acme was enabled.
diff --git a/synapse/app/_base.py b/synapse/app/_base.py

index 9c96816096..0e8b467a3e 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -237,6 +237,12 @@ def start(hs, listeners=None):
     """
     Start a Synapse server or worker.
 
+    Should be called once the reactor is running and (if we're using ACME) the
+    TLS certificates are in place.
+
+    Will start the main HTTP listeners and do some other startup tasks, and then
+    notify systemd.
+
     Args:
         hs (synapse.server.HomeServer)
         listeners (list[dict]): Listener configuration ('listeners' in homeserver.yaml)
@@ -311,9 +317,7 @@ def setup_sdnotify(hs):
 
     # Tell systemd our state, if we're using it. This will silently fail if
     # we're not using systemd.
-    hs.get_reactor().addSystemEventTrigger(
-        "after", "startup", sdnotify, b"READY=1\nMAINPID=%i" % (os.getpid(),)
-    )
+    sdnotify(b"READY=1\nMAINPID=%i" % (os.getpid(),))
 
     hs.get_reactor().addSystemEventTrigger(
         "before", "shutdown", sdnotify, b"STOPPING=1"