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server.py
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server.py
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import re
from socket import AF_INET, SOCK_DGRAM, socket
import threading
import time
import types
import logging
import gmetric
from xdrlib import Packer, Unpacker
log = logging.getLogger(__name__)
try:
from setproctitle import setproctitle
except ImportError:
setproctitle = None
from daemon import Daemon
__all__ = ['Server']
def _clean_key(k):
return re.sub(
r'[^a-zA-Z_\-0-9\.]',
'',
re.sub(
r'\s+',
'_',
k.replace('/','-').replace(' ','_')
)
)
TIMER_MSG = '''%(prefix)s.%(key)s.lower %(min)s %(ts)s
%(prefix)s.%(key)s.count %(count)s %(ts)s
%(prefix)s.%(key)s.mean %(mean)s %(ts)s
%(prefix)s.%(key)s.upper %(max)s %(ts)s
%(prefix)s.%(key)s.upper_%(pct_threshold)s %(max_threshold)s %(ts)s
'''
class Server(object):
def __init__(self, pct_threshold=90, debug=False, transport = 'graphite',
ganglia_host='localhost', ganglia_port=8649, ganglia_spoof_host='statd:statd',
graphite_host='localhost', graphite_port=2003,
flush_interval=10000, no_aggregate_counters = False, counters_prefix = 'stats',
timers_prefix = 'stats.timers'):
self.buf = 8192
self.flush_interval = flush_interval
self.pct_threshold = pct_threshold
self.transport = transport
# Ganglia specific settings
self.ganglia_host = ganglia_host
self.ganglia_port = ganglia_port
self.ganglia_protocol = "udp"
# Set DMAX to flush interval plus 20%. That should avoid metrics to prematurely expire if there is
# some type of a delay when flushing
self.dmax = int ( self.flush_interval * 1.2 )
# What hostname should these metrics be attached to.
self.ganglia_spoof_host = ganglia_spoof_host
# Graphite specific settings
self.graphite_host = graphite_host
self.graphite_port = graphite_port
self.no_aggregate_counters = no_aggregate_counters
self.counters_prefix = counters_prefix
self.timers_prefix = timers_prefix
self.debug = debug
self.counters = {}
self.timers = {}
self.flusher = 0
def process(self, data):
bits = data.split(':')
key = _clean_key(bits[0])
del bits[0]
if len(bits) == 0:
bits.append(0)
for bit in bits:
sample_rate = 1;
fields = bit.split('|')
if None==fields[1]:
log.error('Bad line: %s' % bit)
return
if (fields[1] == 'ms'):
if key not in self.timers:
self.timers[key] = []
self.timers[key].append(float(fields[0] or 0))
else:
if len(fields) == 3:
sample_rate = float(re.match('^@([\d\.]+)', fields[2]).groups()[0])
if key not in self.counters:
self.counters[key] = 0;
self.counters[key] += float(fields[0] or 1) * (1 / sample_rate)
def flush(self):
ts = int(time.time())
stats = 0
if self.transport == 'graphite':
stat_string = ''
else:
g = gmetric.Gmetric(self.ganglia_host, self.ganglia_port, self.ganglia_protocol)
for k, v in self.counters.items():
v = float(v)
v = v if self.no_aggregate_counters else v / (self.flush_interval / 1000)
if self.debug:
print "Sending %s => count=%s" % ( k, v )
if self.transport == 'graphite':
msg = '%s.%s %s %s\n' % (self.counters_prefix, k, v, ts)
stat_string += msg
else:
# We put counters in _counters group. Underscore is to make sure counters show up
# first in the GUI. Change below if you disagree
g.send(k, v, "double", "count", "both", 60, self.dmax, "_counters", self.ganglia_spoof_host)
self.counters[k] = 0
stats += 1
for k, v in self.timers.items():
if len(v) > 0:
# Sort all the received values. We need it to extract percentiles
v.sort()
count = len(v)
min = v[0]
max = v[-1]
mean = min
max_threshold = max
if count > 1:
thresh_index = int((self.pct_threshold / 100.0) * count)
max_threshold = v[thresh_index - 1]
total = sum(v)
mean = total / count
self.timers[k] = []
if self.debug:
print "Sending %s ====> lower=%s, mean=%s, upper=%s, %dpct=%s, count=%s" % ( k, min, mean, max, self.pct_threshold, max_threshold, count )
if self.transport == 'graphite':
stat_string += TIMER_MSG % {
'prefix':self.timers_prefix,
'key':k,
'mean':mean,
'max': max,
'min': min,
'count': count,
'max_threshold': max_threshold,
'pct_threshold': self.pct_threshold,
'ts': ts,
}
else:
# What group should these metrics be in. For the time being we'll set it to the name of the key
group = k
g.send(k + "_lower", min, "double", "time", "both", 60, self.dmax, group, self.ganglia_spoof_host)
g.send(k + "_mean", mean, "double", "time", "both", 60, self.dmax, group, self.ganglia_spoof_host)
g.send(k + "_upper", max, "double", "time", "both", 60, self.dmax, group, self.ganglia_spoof_host)
g.send(k + "_count", count, "double", "count", "both", 60, self.dmax, group, self.ganglia_spoof_host)
g.send(k + "_" + str(self.pct_threshold) +"pct", max_threshold, "double", "time", "both", 60, self.dmax, group, self.ganglia_spoof_host)
stats += 1
if self.transport == 'graphite':
stat_string += "statsd.numStats %s %d\n" % (stats, ts)
graphite = socket()
graphite.connect((self.graphite_host, self.graphite_port))
graphite.sendall(stat_string)
graphite.close()
self._set_timer()
if self.debug:
print "\n================== Flush completed. Waiting until next flush. Sent out %d metrics =======" % ( stats )
def _set_timer(self):
self._timer = threading.Timer(self.flush_interval/1000, self.flush)
self._timer.start()
def serve(self, hostname='', port=8125):
assert type(port) is types.IntType, 'port is not an integer: %s' % (port)
addr = (hostname, port)
self._sock = socket(AF_INET, SOCK_DGRAM)
self._sock.bind(addr)
import signal
def signal_handler(signal, frame):
self.stop()
signal.signal(signal.SIGINT, signal_handler)
self._set_timer()
while 1:
data, addr = self._sock.recvfrom(self.buf)
self.process(data)
def stop(self):
self._timer.cancel()
self._sock.close()
class ServerDaemon(Daemon):
def run(self, options):
if setproctitle:
setproctitle('pystatsd')
server = Server(pct_threshold = options.pct,
debug = options.debug,
transport = options.transport,
graphite_host = options.graphite_host,
graphite_port = options.graphite_port,
ganglia_host = options.ganglia_host,
ganglia_spoof_host = options.ganglia_spoof_host,
ganglia_port = options.ganglia_port,
flush_interval = options.flush_interval,
no_aggregate_counters = options.no_aggregate_counters,
counters_prefix = options.counters_prefix,
timers_prefix = options.timers_prefix)
server.serve(options.name, options.port)
def run_server():
import sys
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('-d', '--debug', dest='debug', action='store_true', help='debug mode', default=False)
parser.add_argument('-n', '--name', dest='name', help='hostname to run on ', default='')
parser.add_argument('-p', '--port', dest='port', help='port to run on (default: 8125)', type=int, default=8125)
parser.add_argument('-r', '--transport', dest='transport', help='transport to use graphite or ganglia', type=str, default="graphite")
parser.add_argument('--graphite-port', dest='graphite_port', help='port to connect to graphite on (default: 2003)', type=int, default=2003)
parser.add_argument('--graphite-host', dest='graphite_host', help='host to connect to graphite on (default: localhost)', type=str, default='localhost')
parser.add_argument('--ganglia-port', dest='ganglia_port', help='port to connect to ganglia on', type=int, default=8649)
parser.add_argument('--ganglia-host', dest='ganglia_host', help='host to connect to ganglia on', type=str, default='localhost')
parser.add_argument('--ganglia-spoof-host', dest='ganglia_spoof_host', help='host to report metrics as to ganglia', type=str, default='statd:statd')
parser.add_argument('--flush-interval', dest='flush_interval', help='how often to send data to graphite in millis (default: 10000)', type=int, default=10000)
parser.add_argument('--no-aggregate-counters', dest='no_aggregate_counters', help='should statsd report counters as absolute instead of count/sec', action='store_true')
parser.add_argument('--counters-prefix', dest='counters_prefix', help='prefix to append before sending counter data to graphite (default: statsd)', type=str, default='statsd')
parser.add_argument('--timers-prefix', dest='timers_prefix', help='prefix to append before sending timing data to graphite (default: statsd.timers)', type=str, default='statsd.timers')
parser.add_argument('-t', '--pct', dest='pct', help='stats pct threshold (default: 90)', type=int, default=90)
parser.add_argument('-D', '--daemon', dest='daemonize', action='store_true', help='daemonize', default=False)
parser.add_argument('--pidfile', dest='pidfile', action='store', help='pid file', default='/tmp/pystatsd.pid')
parser.add_argument('--restart', dest='restart', action='store_true', help='restart a running daemon', default=False)
parser.add_argument('--stop', dest='stop', action='store_true', help='stop a running daemon', default=False)
options = parser.parse_args(sys.argv[1:])
daemon = ServerDaemon(options.pidfile)
if options.daemonize:
daemon.start(options)
elif options.restart:
daemon.restart(options)
elif options.stop:
daemon.stop()
else:
daemon.run(options)
if __name__ == '__main__':
run_server()