statsd: use safe mode and disable statsd if we can't connect

vcsserver/lib/_vendor/statsd/__init__.py

@@ -1,46 +1,52 b''
 from __future__ import absolute_import, division, unicode_literals
 
 import logging
 
 from .stream import TCPStatsClient, UnixSocketStatsClient  # noqa
 from .udp import StatsClient  # noqa
 
 HOST = 'localhost'
 PORT = 8125
 IPV6 = False
 PREFIX = None
 MAXUDPSIZE = 512
 
 log = logging.getLogger('rhodecode.statsd')
 
 
 def statsd_config(config, prefix='statsd.'):
     _config = {}
     for key in config.keys():
         if key.startswith(prefix):
             _config[key[len(prefix):]] = config[key]
     return _config
 
 
 def client_from_config(configuration, prefix='statsd.', **kwargs):
     from pyramid.settings import asbool
 
     _config = statsd_config(configuration, prefix)
     statsd_enabled = asbool(_config.pop('enabled', False))
     if not statsd_enabled:
         log.debug('statsd client not enabled by statsd.enabled =  flag, skipping...')
         return
 
     host = _config.pop('statsd_host', HOST)
     port = _config.pop('statsd_port', PORT)
     prefix = _config.pop('statsd_prefix', PREFIX)
     maxudpsize = _config.pop('statsd_maxudpsize', MAXUDPSIZE)
     ipv6 = asbool(_config.pop('statsd_ipv6', IPV6))
     log.debug('configured statsd client %s:%s', host, port)
 
-    return StatsClient(
-        host=host, port=port, prefix=prefix, maxudpsize=maxudpsize, ipv6=ipv6)
+    try:
+        client = StatsClient(
+            host=host, port=port, prefix=prefix, maxudpsize=maxudpsize, ipv6=ipv6)
+    except Exception:
+        log.exception('StatsD is enabled, but failed to connect to statsd server, fallback: disable statsd')
+        client = None
+
+    return client
 
 
 def get_statsd_client(request):
     return client_from_config(request.registry.settings)