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#!/usr/bin/env python
"""
Copyright 2009 Lucio Torre <lucio.torre@canonical.com>
This is an AMQP client that will connect to the specified broker and read
messages, parse them, and post them as metrics.
Each message's routing key should be a metric name.
The message body should be one or more lines of the form:
<value> <timestamp>\n
<value> <timestamp>\n
...
Where each <value> is a real number and <timestamp> is a UNIX epoch time.
This program can be started standalone for testing or using carbon-cache.py
(see example config file provided)
"""
import sys
import os
import socket
from optparse import OptionParser
from twisted.internet.defer import inlineCallbacks
from twisted.internet import reactor
from twisted.internet.protocol import ReconnectingClientFactory
from txamqp.protocol import AMQClient
from txamqp.client import TwistedDelegate
import txamqp.spec
try:
import carbon
except:
# this is being run directly, carbon is not installed
LIB_DIR = os.path.dirname(os.path.dirname(__file__))
sys.path.insert(0, LIB_DIR)
import carbon.protocols #satisfy import order requirements
from carbon.instrumentation import increment
from carbon.events import metricReceived
from carbon.conf import settings
from carbon import log
HOSTNAME = socket.gethostname().split('.')[0]
class AMQPGraphiteProtocol(AMQClient):
"""This is the protocol instance that will receive and post metrics."""
consumer_tag = "graphite_consumer"
@inlineCallbacks
def connectionMade(self):
yield AMQClient.connectionMade(self)
log.listener("New AMQP connection made")
yield self.setup()
yield self.receive_loop()
@inlineCallbacks
def setup(self):
exchange = self.factory.exchange_name
yield self.authenticate(self.factory.username, self.factory.password)
chan = yield self.channel(1)
yield chan.channel_open()
# declare the exchange and queue
yield chan.exchange_declare(exchange=exchange, type="topic",
durable=True, auto_delete=False)
# we use a private queue to avoid conflicting with existing bindings
reply = yield chan.queue_declare(exclusive=True)
my_queue = reply.queue
# bind each configured metric pattern
for bind_pattern in settings.BIND_PATTERNS:
log.listener("binding exchange '%s' to queue '%s' with pattern %s" \
% (exchange, my_queue, bind_pattern))
yield chan.queue_bind(exchange=exchange, queue=my_queue,
routing_key=bind_pattern)
yield chan.basic_consume(queue=my_queue, no_ack=True,
consumer_tag=self.consumer_tag)
@inlineCallbacks
def receive_loop(self):
queue = yield self.queue(self.consumer_tag)
while True:
msg = yield queue.get()
self.processMessage(msg)
def processMessage(self, message):
"""Parse a message and post it as a metric."""
if self.factory.verbose:
log.listener("Message received: %s" % (message,))
metric = message.routing_key
for line in message.content.body.split("\n"):
line = line.strip()
if not line:
continue
try:
if settings.get("AMQP_METRIC_NAME_IN_BODY", False):
metric, value, timestamp = line.split()
else:
value, timestamp = line.split()
datapoint = ( float(timestamp), float(value) )
except ValueError:
log.listener("invalid message line: %s" % (line,))
continue
increment('metricsReceived')
metricReceived(metric, datapoint)
if self.factory.verbose:
log.listener("Metric posted: %s %s %s" %
(metric, value, timestamp,))
class AMQPReconnectingFactory(ReconnectingClientFactory):
"""The reconnecting factory.
Knows how to create the extended client and how to keep trying to
connect in case of errors."""
protocol = AMQPGraphiteProtocol
def __init__(self, username, password, delegate, vhost, spec, channel,
exchange_name, verbose):
self.username = username
self.password = password
self.delegate = delegate
self.vhost = vhost
self.spec = spec
self.channel = channel
self.exchange_name = exchange_name
self.verbose = verbose
def buildProtocol(self, addr):
p = self.protocol(self.delegate, self.vhost, self.spec)
p.factory = self
return p
def createAMQPListener(username, password, vhost, exchange_name,
spec=None, channel=1, verbose=False):
"""
Create an C{AMQPReconnectingFactory} configured with the specified options.
"""
# use provided spec if not specified
if not spec:
spec = txamqp.spec.load(os.path.normpath(
os.path.join(os.path.dirname(__file__), 'amqp0-8.xml')))
delegate = TwistedDelegate()
factory = AMQPReconnectingFactory(username, password, delegate, vhost,
spec, channel, exchange_name,
verbose=verbose)
return factory
def startReceiver(host, port, username, password, vhost, exchange_name,
spec=None, channel=1, verbose=False):
"""
Starts a twisted process that will read messages on the amqp broker and
post them as metrics.
"""
factory = createAMQPListener(username, password, vhost, exchange_name,
spec=spec, channel=channel, verbose=verbose)
reactor.connectTCP(host, port, factory)
def main():
parser = OptionParser()
parser.add_option("-t", "--host", dest="host",
help="host name", metavar="HOST", default="localhost")
parser.add_option("-p", "--port", dest="port", type=int,
help="port number", metavar="PORT",
default=5672)
parser.add_option("-u", "--user", dest="username",
help="username", metavar="USERNAME",
default="guest")
parser.add_option("-w", "--password", dest="password",
help="password", metavar="PASSWORD",
default="guest")
parser.add_option("-V", "--vhost", dest="vhost",
help="vhost", metavar="VHOST",
default="/")
parser.add_option("-e", "--exchange", dest="exchange",
help="exchange", metavar="EXCHANGE",
default="graphite")
parser.add_option("-v", "--verbose", dest="verbose",
help="verbose",
default=False, action="store_true")
(options, args) = parser.parse_args()
log.logToStdout()
startReceiver(options.host, options.port, options.username,
options.password, vhost=options.vhost,
exchange_name=options.exchange, verbose=options.verbose)
reactor.run()
if __name__ == "__main__":
main()
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