Back to uvicorn workers from eventlet.

The eventlet API has way too many dependency issues with gunicorn.

Still TODO: Fix or at least mitigate the WSGI workers timeout issue when
they handle websocket connections.

docs/source/conf.py

@@ -303,6 +303,7 @@ autodoc_mock_imports = [
     'bluetooth_numbers',
     'TheengsDecoder',
     'simple_websocket',
+    'uvicorn',
 ]
 
 sys.path.insert(0, os.path.abspath('../..'))

platypush/backend/http/__init__.py

@@ -252,8 +252,8 @@ class HttpBackend(Backend):
             kwargs = {
                 'bind': f'{self.bind_address}:{self.port}',
                 'workers': (cpu_count() * 2) + 1,
-                'worker_class': 'eventlet',
-                'timeout': 60,
+                'worker_class_str': f'{__package__}.app.UvicornWorker',
+                'timeout': 30,
             }
 
             WSGIApplicationWrapper(f'{__package__}.app:application', kwargs).run()

platypush/backend/http/wsgi/__init__.py

@@ -1,4 +1,11 @@
+from typing import Any, Dict
+
 from gunicorn.app.wsgiapp import WSGIApplication
+from uvicorn.workers import UvicornWorker as BaseUvicornWorker
+
+
+class UvicornWorker(BaseUvicornWorker):
+    CONFIG_KWARGS: Dict[str, Any] = {"loop": "auto", "http": "auto", "lifespan": "on"}
 
 
 class WSGIApplicationWrapper(WSGIApplication):

requirements.txt

@@ -5,7 +5,6 @@
 alembic
 bcrypt
 croniter
-eventlet
 flask
 frozendict
 gunicorn
@@ -22,6 +21,7 @@ rsa
 simple_websocket
 sqlalchemy
 tz
+uvicorn
 websocket-client
 wsproto
 zeroconf>=0.27.0

setup.py

@@ -63,10 +63,9 @@ setup(
         'alembic',
         'bcrypt',
         'croniter',
-        'eventlet',
         'flask',
         'frozendict',
-        'gunicorn @ https://github.com/benoitc/gunicorn/tarball/master',
+        'gunicorn',
         'marshmallow',
         'marshmallow_dataclass',
         'python-dateutil',
@@ -78,6 +77,7 @@ setup(
         'simple_websocket',
         'sqlalchemy',
         'tz',
+        'uvicorn',
         'websocket-client',
         'wheel',
         'wsproto',