/usr/share/pyshared/carbon/amqp_listener.py is in graphite-carbon 0.9.12-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
Copyright 2009 Lucio Torre <lucio.torre@canonical.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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.python.failure import Failure
from twisted.internet.defer import deferredGenerator, waitForDeferred
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.conf import settings
from carbon import log, events, instrumentation
HOSTNAME = socket.gethostname().split('.')[0]
class AMQPGraphiteProtocol(AMQClient):
"""This is the protocol instance that will receive and post metrics."""
consumer_tag = "graphite_consumer"
@deferredGenerator
def connectionMade(self):
AMQClient.connectionMade(self)
log.listener("New AMQP connection made")
self.setup()
wfd = waitForDeferred(self.receive_loop())
yield wfd
@deferredGenerator
def setup(self):
exchange = self.factory.exchange_name
d = self.authenticate(self.factory.username, self.factory.password)
wfd = waitForDeferred(d)
yield wfd
wfd = waitForDeferred(self.channel(1))
yield wfd
chan = wfd.getResult()
wfd = waitForDeferred(chan.channel_open())
yield wfd
# declare the exchange and queue
d = chan.exchange_declare(exchange=exchange, type="topic",
durable=True, auto_delete=False)
wfd = waitForDeferred(d)
yield wfd
# we use a private queue to avoid conflicting with existing bindings
wfd = waitForDeferred(chan.queue_declare(exclusive=True))
yield wfd
reply = wfd.getResult()
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))
d = chan.queue_bind(exchange=exchange, queue=my_queue,
routing_key=bind_pattern)
wfd = waitForDeferred(d)
yield wfd
d = chan.basic_consume(queue=my_queue, no_ack=True,
consumer_tag=self.consumer_tag)
wfd = waitForDeferred(d)
yield wfd
@deferredGenerator
def receive_loop(self):
wfd = waitForDeferred(self.queue(self.consumer_tag))
yield wfd
queue = wfd.getResult()
while True:
wfd = waitForDeferred(queue.get())
yield wfd
msg = wfd.getResult()
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) )
if datapoint[1] != datapoint[1]: # filter out NaN values
continue
except ValueError:
log.listener("invalid message line: %s" % (line,))
continue
events.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()
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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