Epic/lre

.flake8

 [flake8]
 max-line-length = 120
+ignore = D
\ No newline at end of file

src/prozorro_sale/metrics/__init__.py

 import asyncio
+import logging
 import signal
 from typing import Any
 
-from aiohttp import web
 import prometheus_client
-import logging
-
+from aiohttp import web
 from aiohttp.web_runner import _raise_graceful_exit
 
 LOG = logging.getLogger('application_wrapper')
@@ -72,12 +71,27 @@ class CoroutineWrapper:
 
 
 class ApplicationWrapper:
-    """Application wrapper for exporting metrics on prometheus
+    """
+    Application wrapper for exporting metrics on prometheus
+
     Args:
         _loop (:obj:, optional): Event loop
+        **kwargs: Arbitrary keyword arguments.
+    Returns:
+            None
+    Examples:
+        kwargs[prometheus] - for setup prometheus client
+            prometheus={
+                '_port': 9091,
+                'tcp_params': {
+                    'backlog': 256,
+                    'reuse_address': True,
+                    'reuse_port': True
+                }
+            }
     """
 
-    def __init__(self, _loop=None):
+    def __init__(self, _loop=None, **kwargs: Any):
         self.loop = _loop
         self.apps = []
         if _loop is None:
@@ -85,10 +99,20 @@ class ApplicationWrapper:
         else:
             self.loop = _loop
 
-        self.add_web_app(init_mertics_app(), _port=9091)
+        prometheus = kwargs.get('prometheus', {
+            '_port': 9091,
+            'tcp_params': {
+                'reuse_address': True,
+                'reuse_port': True
+            }
+        })
+        if isinstance(prometheus, dict):
+            self.add_web_app(init_mertics_app(), **prometheus)
 
     def add_web_app(self, _app: web.Application, _port: int, **kwargs: Any) -> None:
-        """Add Application for start list
+        """
+        Add Application for start list
+
         Args:
             _app (obj): Application
             _port (int): Application PORT to listed
@@ -122,8 +146,8 @@ class ApplicationWrapper:
         try:
             LOG.info('Start serving')
             self.loop.run_until_complete(asyncio.gather(*[app.initialize() for app in self.apps]))
-        except KeyboardInterrupt:
-            pass
+        except (KeyboardInterrupt, asyncio.exceptions.CancelledError):
+            ...
         finally:
             for app in self.apps:
                 app.shutdown()