chore(gunicorn): review and update configuration

config/root/etc/s6-overlay/s6-rc.d/gunicorn/run

@@ -21,4 +21,4 @@ then
 fi
 
 exec s6-setuidgid app \
-    /usr/local/bin/gunicorn -c /app/tubesync/gunicorn.py --capture-output tubesync.wsgi:application
+    /usr/local/bin/gunicorn --config /app/tubesync/gunicorn.py

tubesync/tubesync/gunicorn.py

@@ -2,37 +2,60 @@
 import multiprocessing
 
 
+def get_bind():
+    host = os.getenv('LISTEN_HOST', '127.0.0.1')
+    port = os.getenv('LISTEN_PORT', '8080')
+    return f'{host}:{port}'
+
 def get_num_workers():
     # Sane max workers to allow to be spawned
     cpu_workers = multiprocessing.cpu_count() * 2 + 1
     # But default to 3
+    num_workers = 3
     try:
-        num_workers = int(os.getenv('GUNICORN_WORKERS', 3))
-    except ValueError:
-        num_workers = cpu_workers
-    if 0 < num_workers < cpu_workers:
-        return num_workers
-    else:
-        return cpu_workers
+        gunicorn_workers = os.getenv('GUNICORN_WORKERS')
+        web_concurrency = os.getenv('WEB_CONCURRENCY')
+        if gunicorn_workers is not None:
+            try:
+                num_workers = int(gunicorn_workers)
+            except:
+                pass
+        elif web_concurrency is not None:
+            try:
+                num_workers = int(web_concurrency)
+            except:
+                pass
+    except:
+        pass
+    return max(1, min(num_workers, cpu_workers))
 
 
-def get_bind():
-    host = os.getenv('LISTEN_HOST', '127.0.0.1')
-    port = os.getenv('LISTEN_PORT', '8080')
-    return '{}:{}'.format(host, port)
+### Configuration
 
+##### Logging
+# Access logs are printed to stdout from nginx
+accesslog = None
+errorlog = '-'
+loglevel = 'info'
+capture_output = 'tubesync.wsgi:application'
 
-workers = get_num_workers()
-timeout = 90
-chdir = '/app'
+##### Process
+proc_name = 'gunicorn'
 daemon = False
-control_socket_disable = True
-control_socket = '/run/app/gunicorn.ctl'
-pidfile = '/run/app/gunicorn.pid'
 user = 'app'
 group = 'app'
-loglevel = 'info'
-errorlog = '-'
-accesslog = '/dev/null'  # Access logs are printed to stdout from nginx
-django_settings = 'django.settings'
+chdir = '/app'
+control_socket = '/run/app/gunicorn.ctl'
+control_socket_disable = True
+pidfile = '/run/app/gunicorn.pid'
+
+##### Server
 bind = get_bind()
+django_settings = 'django.settings'
+graceful_timeout = 120
+keepalive = 60
+max_requests = 1000
+max_requests_jitter = 100
+timeout = 90
+worker_class = 'sync'
+workers = get_num_workers()