diff -r 058bb3dc685f -r 0b59724cb3f2 cubicweb/statsd_logger.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/statsd_logger.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,135 @@
+# copyright 2015 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of CubicWeb.
+#
+# CubicWeb is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 2.1 of the License, or (at your option)
+# any later version.
+#
+# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Simple statsd_ logger for cubicweb.
+
+This module is meant to be configured by setting a couple of global variables:
+
+- ``bucket`` global variable will be used as statsd bucket in every
+statsd_ UDP sent packet.
+
+`- `address`` is a pair (IP, port) specifying the address of the
+statsd_ server
+
+
+There are 3 kinds of statds_ message::
+
+- ``statsd_c(context, n)`` is a simple function to send statsd_
+  counter-type of messages like::
+
+    <bucket>.<context>:<n>|c\n
+
+- ``statsd_g(context, value)`` to send statsd_ gauge-type of messages
+  like::
+
+    <bucket>.<context>:<n>|g\n
+
+- ``statsd_t(context, ms)`` to send statsd_ time-type of messages
+  like::
+
+    <bucket>.<context>:<ms>|ms\n
+
+There is also a decorator (``statsd_timeit``) that may be used to
+measure and send to the statsd_ server the time passed in a function
+or a method and the number of calls. It will send a message like::
+   
+    <bucket>.<funcname>:<ms>|ms\n<bucket>.<funcname>:1|c\n
+
+
+.. _statsd: https://github.com/etsy/statsd
+
+"""
+
+__docformat__ = "restructuredtext en"
+
+import time
+import socket
+
+_bucket = 'cubicweb'
+_address = None
+_socket = None
+
+
+def setup(bucket, address):
+    """Configure the statsd endpoint
+
+    :param bucket: the name of the statsd bucket that will be used to
+                   build messages.
+
+    :param address: the UDP endpoint of the statsd server. Must a
+                    couple (ip, port).
+    """
+    global _bucket, _address, _socket
+    packed = None
+    for family in (socket.AF_INET6, socket.AF_INET):
+        try:
+            packed = socket.inet_pton(family, address[0])
+            break
+        except socket.error:
+            continue
+    if packed is None:
+        return
+    _bucket, _address = bucket, address
+    _socket = socket.socket(family, socket.SOCK_DGRAM)
+
+
+def statsd_c(context, n=1):
+    if _address is not None:
+        _socket.sendto('{0}.{1}:{2}|c\n'.format(_bucket, context, n), _address)
+
+
+def statsd_g(context, value):
+    if _address is not None:
+        _socket.sendto('{0}.{1}:{2}|g\n'.format(_bucket, context, value), _address)
+
+
+def statsd_t(context, value):
+    if _address is not None:
+        _socket.sendto('{0}.{1}:{2:.4f}|ms\n'.format(_bucket, context, value), _address)
+
+
+class statsd_timeit(object):
+    __slots__ = ('callable',)
+
+    def __init__(self, callableobj):
+        self.callable = callableobj
+
+    @property
+    def __doc__(self):
+        return self.callable.__doc__
+    @property
+    def __name__(self):
+        return self.callable.__name__
+    
+    def __call__(self, *args, **kw):
+        if _address is None:
+            return self.callable(*args, **kw)
+        t0 = time.time()
+        try:
+            return self.callable(*args, **kw)
+        finally:
+            dt = 1000*(time.time()-t0)
+            msg = '{0}.{1}:{2:.4f}|ms\n{0}.{1}:1|c\n'.format(_bucket, self.__name__, dt)
+            _socket.sendto(msg, _address)
+                
+    def __get__(self, obj, objtype):
+        """Support instance methods."""
+        if obj is None: # class method or some already wrapped method
+            return self
+        import functools
+        return functools.partial(self.__call__, obj)