Add proxy-server support

docs/usage.rst

@@ -158,3 +158,52 @@ In such case, you can omit the `hook_url` key in the logging config.
 .. _logging: https://docs.python.org/3/library/logging.html
 .. _incoming webhook integration: https://my.slack.com/services/new/incoming-webhook/
 .. _dictConfig: https://docs.python.org/3/library/logging.config.html#logging.config.dictConfig
+
+Proxy-server Support
+++++++++++++++++++++
+
+It's possible to use an external proxy-server. To do it just add proxy address as
+proxy_url argument in the SlackHandler:
+
+.. code-block:: python
+
+    h = SlackHandler(hook_url=URL, proxy_url=PROXY_URL)
+
+
+or via config:
+
+.. code-block:: python
+
+    DICT_CONFIG = {
+        'version': 1,
+        'disable_existing_loggers': False,
+        'filters': {
+            'slack_filter': {
+                '()': 'webhook_logger.slack.SlackLogFilter',
+            }
+        },
+        'handlers': {
+            'slack': {
+                'level': 'INFO',
+                'filters': ['slack_filter'],
+                'class': 'webhook_logger.slack.SlackHandler',
+                'hook_url': 'https://hooks.slack.com/services/XXXXXXXX/AAAAAAAAA/aaaaaaaaaaaa',
+                'proxy_url': 'proxy:3128',
+                'formatter': 'slack_format',
+            }
+        },
+        'formatters': {
+            'slack_format': {
+                '()': 'webhook_logger.slack.SlackFormatter',
+                'title': 'Your optional title'
+            },
+        },
+        'loggers': {
+            'my_logger': {
+                'handlers': ['slack'],
+                'level': 'DEBUG'
+            }
+        }
+    }
+
+

webhook_logger/slack.py

@@ -14,9 +14,13 @@
 class SlackHandler(logging.Handler):
     """Logging handler to post to Slack to the webhook URL"""
 
-    def __init__(self, hook_url=None, *args, **kwargs):
+    def __init__(self, hook_url=None, proxy_url=None, *args, **kwargs):
         super(SlackHandler, self).__init__(*args, **kwargs)
         self._hook_url = hook_url
+        self._proxies = {
+                'http': proxy_url,
+                'https': proxy_url,
+            } if proxy_url else {}
         self.formatter = SimpleSlackFormatter()
 
     @property
@@ -31,7 +35,7 @@ def emit(self, record):
         """
         try:
             slack_data = self.format(record)
-            requests.post(self.hook_url, json=slack_data)
+            requests.post(self.hook_url, json=slack_data, proxies=self._proxies)
         except Exception:
             self.handleError(record)