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-rw-r--r--synapse/app/homeserver.py13
1 files changed, 6 insertions, 7 deletions
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index ec7401f911..b011e00b4b 100644
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -380,13 +380,12 @@ def setup(config_options):
 
     hs.setup_master()
 
-    @defer.inlineCallbacks
-    def do_acme():
+    async def do_acme() -> bool:
         """
         Reprovision an ACME certificate, if it's required.
 
         Returns:
-            Deferred[bool]: Whether the cert has been updated.
+            Whether the cert has been updated.
         """
         acme = hs.get_acme_handler()
 
@@ -405,7 +404,7 @@ def setup(config_options):
             provision = True
 
         if provision:
-            yield acme.provision_certificate()
+            await acme.provision_certificate()
 
         return provision
 
@@ -415,7 +414,7 @@ def setup(config_options):
         Provision a certificate from ACME, if required, and reload the TLS
         certificate if it's renewed.
         """
-        reprovisioned = yield do_acme()
+        reprovisioned = yield defer.ensureDeferred(do_acme())
         if reprovisioned:
             _base.refresh_certificate(hs)
 
@@ -427,8 +426,8 @@ def setup(config_options):
                 acme = hs.get_acme_handler()
                 # Start up the webservices which we will respond to ACME
                 # challenges with, and then provision.
-                yield acme.start_listening()
-                yield do_acme()
+                yield defer.ensureDeferred(acme.start_listening())
+                yield defer.ensureDeferred(do_acme())
 
                 # Check if it needs to be reprovisioned every day.
                 hs.get_clock().looping_call(reprovision_acme, 24 * 60 * 60 * 1000)