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authorErik Johnston <erik@matrix.org>2022-03-08 13:23:18 +0000
committerGitHub <noreply@github.com>2022-03-08 13:23:18 +0000
commit2ce27a24fe29104ca54e0a879c7ad37d88a3fc69 (patch)
tree23a2ace0464dfc2fcad8b333fe6bbe93359901fc /synapse/__init__.py
parentDo not return allowed_room_ids from /hierarchy response. (#12175) (diff)
downloadsynapse-2ce27a24fe29104ca54e0a879c7ad37d88a3fc69.tar.xz
Add experimental environment variable to enable asyncio reactor (#12135)
Diffstat (limited to '')
-rw-r--r--synapse/__init__.py21
1 files changed, 21 insertions, 0 deletions
diff --git a/synapse/__init__.py b/synapse/__init__.py
index b21e1ed0f3..674acc7135 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -25,6 +25,27 @@ if sys.version_info < (3, 7):
     print("Synapse requires Python 3.7 or above.")
     sys.exit(1)
 
+# Allow using the asyncio reactor via env var.
+if bool(os.environ.get("SYNAPSE_ASYNC_IO_REACTOR", False)):
+    try:
+        from incremental import Version
+
+        import twisted
+
+        # We need a bugfix that is included in Twisted 21.2.0:
+        # https://twistedmatrix.com/trac/ticket/9787
+        if twisted.version < Version("Twisted", 21, 2, 0):
+            print("Using asyncio reactor requires Twisted>=21.2.0")
+            sys.exit(1)
+
+        import asyncio
+
+        from twisted.internet import asyncioreactor
+
+        asyncioreactor.install(asyncio.get_event_loop())
+    except ImportError:
+        pass
+
 # Twisted and canonicaljson will fail to import when this file is executed to
 # get the __version__ during a fresh install. That's OK and subsequent calls to
 # actually start Synapse will import these libraries fine.