280 lines
8.3 KiB
Python
280 lines
8.3 KiB
Python
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# standard
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import cStringIO
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import optparse
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import os
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import resource
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import signal
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import string
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import sys
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import time
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import traceback
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from collections import defaultdict
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# local
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from core import __version__
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# vendor
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import gevent, gevent.socket
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socket = gevent.socket
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# constants
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INTERVAL = 10.0
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PERCENT = 90.0
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MAX_PACKET = 2048
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DESCRIPTION = '''
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A statsd service in Python + gevent.
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'''
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# table to remove invalid characters from keys
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ALL_ASCII = set(chr(c) for c in range(256))
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KEY_VALID = string.ascii_letters + string.digits + '_-.'
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KEY_TABLE = string.maketrans(KEY_VALID + '/', KEY_VALID + '_')
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KEY_DELETIONS = ''.join(ALL_ASCII.difference(KEY_VALID + '/'))
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# error messages
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E_BADADDR = 'invalid bind address specified %r'
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E_BADTARGET = 'invalid target specified %r'
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E_BADBACKEND = 'invalid backend specified %r'
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E_NOTARGETS = 'you must specify at least one stats destination'
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E_SENDFAIL = 'failed to send stats to %s %s: %s'
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def daemonize(umask=0027):
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if gevent.fork():
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os._exit(0)
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os.setsid()
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if gevent.fork():
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os._exit(0)
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os.umask(umask)
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fd_limit = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
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if fd_limit == resource.RLIM_INFINITY:
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fd_limit = 1024
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for fd in xrange(0, fd_limit):
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try:
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os.close(fd)
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except:
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pass
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os.open(os.devnull, os.O_RDWR)
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os.dup2(0, 1)
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os.dup2(0, 2)
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gevent.reinit()
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def parse_addr(text):
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"Parse a 1- to 3-part address spec."
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if text:
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parts = text.split(':')
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length = len(parts)
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if length== 3:
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return parts[0], parts[1], int(parts[2])
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elif length == 2:
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return None, parts[0], int(parts[1])
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elif length == 1:
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return None, '', int(parts[0])
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return None, None, None
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class StatsDaemon(object):
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"""
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A statsd service implementation in Python + gevent.
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"""
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def __init__(self, bindaddr, targets, interval, percent, debug=0):
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# parse and validate
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_, host, port = parse_addr(bindaddr)
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if port is None:
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self._exit(E_BADADDR % bindaddr)
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self._bindaddr = (host, port)
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# parse backend targets
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if not targets:
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self._exit(E_NOTARGETS)
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self._targets = []
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for target in targets:
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backend, host, port = parse_addr(target)
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if backend is None:
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backend = 'graphite'
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if port is None:
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self._exit(E_BADTARGET % target)
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func = getattr(self, '_send_%s' % backend, None)
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if not func:
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self._exit(E_BADBACKEND % backend)
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self._targets.append((func, (host, port)))
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self._interval = float(interval)
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self._percent = float(percent)
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self._debug = debug
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self._timers = defaultdict(list)
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self._counts = defaultdict(float)
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self._sock = None
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self._flush_task = None
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def _exit(self, msg, code=1):
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self._error(msg)
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sys.exit(code)
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def _error(self, msg):
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sys.stderr.write(msg + '\n')
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def start(self):
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"Start the service"
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# register signals
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gevent.signal(signal.SIGINT, self._shutdown)
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# spawn the flush trigger
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def _flush_impl():
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while 1:
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gevent.sleep(self._interval)
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for func, hostport in self._targets:
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try:
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func(hostport)
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except Exception, ex:
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self._error(traceback.format_tb(sys.exc_info()[-1]))
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self._flush_task = gevent.spawn(_flush_impl)
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# start accepting connections
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self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
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socket.IPPROTO_UDP)
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self._sock.bind(self._bindaddr)
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while 1:
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try:
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self._process(*self._sock.recvfrom(MAX_PACKET))
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except Exception, ex:
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self._error(str(ex))
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def _shutdown(self):
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"Shutdown the server"
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self._exit("service exiting", code=0)
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def _process(self, data, _):
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"Process a single packet"
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parts = data.split(':')
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if self._debug:
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self._error('packet: %r' % data)
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if not parts:
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return
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key = parts[0].translate(KEY_TABLE, KEY_DELETIONS)
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for part in parts[1:]:
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srate = 1.0
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fields = part.split('|')
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length = len(fields)
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if length < 2:
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continue
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value = fields[0]
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stype = fields[1].strip()
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# timer (milliseconds)
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if stype == 'ms':
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self._timers[key].append(float(value if value else 0))
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# counter with optional sample rate
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elif stype == 'c':
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if length == 3 and fields[2].startswith('@'):
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srate = float(fields[2][1:])
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value = float(value if value else 1) * (1 / srate)
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self._counts[key] += value
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def _send_graphite(self, dest):
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"Send blob of stats data to graphite server"
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buf = cStringIO.StringIO()
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now = int(time.time())
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num_stats = 0
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# timer stats
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pct = self._percent
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timers = self._timers
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for key, vals in timers.iteritems():
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if not vals:
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continue
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# compute statistics
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num = len(vals)
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vals = sorted(vals)
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vmin = vals[0]
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vmax = vals[-1]
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mean = vmin
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max_at_thresh = vmax
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if num > 1:
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idx = round((pct / 100.0) * num)
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tmp = vals[:int(idx)]
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if tmp:
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max_at_thresh = tmp[-1]
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mean = sum(tmp) / idx
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key = 'stats.timers.%s' % key
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buf.write('%s.mean %f %d\n' % (key, mean, now))
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buf.write('%s.upper %f %d\n' % (key, vmax, now))
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buf.write('%s.upper_%d %f %d\n' % (key, pct, max_at_thresh, now))
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buf.write('%s.lower %f %d\n' % (key, vmin, now))
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buf.write('%s.count %d %d\n' % (key, num, now))
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num_stats += 1
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# counter stats
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counts = self._counts
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for key, val in counts.iteritems():
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buf.write('stats.%s %f %d\n' % (key, val / self._interval, now))
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buf.write('stats_counts.%s %f %d\n' % (key, val, now))
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num_stats += 1
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buf.write('statsd.numStats %d %d\n' % (num_stats, now))
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# reset
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self._timers = defaultdict(list)
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self._counts = defaultdict(float)
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del timers
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del counts
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# XXX: add support for N retries
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# flush stats to graphite
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect(dest)
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sock.sendall(buf.getvalue())
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sock.close()
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except Exception, ex:
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self._error(E_SENDFAIL % ('graphite', dest, ex))
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def main():
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opts = optparse.OptionParser(description=DESCRIPTION, version=__version__)
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opts.add_option('-b', '--bind', dest='bind_addr', default=':8125',
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help="bind [host]:port (host defaults to '')")
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opts.add_option('-d', '--dest', dest='dest_addr', action='append',
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default=[],
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help="receiver [backend:]host:port (backend defaults to 'graphite')")
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opts.add_option('-v', dest='verbose', action='count', default=0,
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help="increase verbosity (currently used for debugging)")
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opts.add_option('-f', '--flush', dest='interval', default=INTERVAL,
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help="flush interval, in seconds (default 10)")
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opts.add_option('-p', '--percent', dest='percent', default=PERCENT,
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help="percent threshold (default 90)")
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opts.add_option('-l', '--list', dest='list_backends', action='store_true',
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help="list supported backends")
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opts.add_option('-D', '--daemonize', dest='daemonize', action='store_true',
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help='daemonize the service')
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(options, args) = opts.parse_args()
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if options.list_backends:
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for key in [k for k in dir(StatsDaemon) if k.startswith('_send_')]:
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print(key[6:])
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sys.exit()
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if options.daemonize:
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daemonize()
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sd = StatsDaemon(options.bind_addr, options.dest_addr, options.interval,
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options.percent, options.verbose)
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sd.start()
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if __name__ == '__main__':
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main()
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