Use uvloop as an asyncio reactor event loop

Author: reivilibre

poetry.lock

@@ -207,6 +207,7 @@ hiredis = { version = "*", optional = true }
 Pympler = { version = "*", optional = true }
 parameterized = { version = ">=0.7.4", optional = true }
 idna = { version = ">=2.5", optional = true }
+uvloop = { version = ">=0.17.0", optional = true }
 
 [tool.poetry.extras]
 # NB: Packages that should be part of `pip install matrix-synapse[all]` need to be specified
@@ -229,6 +230,7 @@ redis = ["txredisapi", "hiredis"]
 # Required to use experimental `caches.track_memory_usage` config option.
 cache_memory = ["pympler"]
 test = ["parameterized", "idna"]
+uvloop = ["uvloop"]
 
 # The duplication here is awful. I hate hate hate hate hate it. However, for now I want
 # to ensure you can still `pip install matrix-synapse[all]` like today. Two motivations:
@@ -260,6 +262,8 @@ all = [
     "txredisapi", "hiredis",
     # cache_memory
     "pympler",
+    # uvloop
+    "uvloop",
     # omitted:
     #   - test: it's useful to have this separate from dev deps in the olddeps job
     #   - systemd: this is a system-based requirement

pyproject.toml

@@ -44,6 +44,12 @@
 
         from twisted.internet import asyncioreactor
 
+        if bool(os.environ.get("SYNAPSE_UVLOOP", False)):
+            import uvloop
+
+            uvloop.install()
+            print("Using uvloop")
+
         asyncioreactor.install(asyncio.get_event_loop())
     except ImportError:
         pass