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#!/usr/bin/env python
"""
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.

Will publish metrics over AMQP
"""
import os
import time
from optparse import OptionParser

from twisted.python.failure import Failure
from twisted.internet.defer import deferredGenerator, waitForDeferred
from twisted.internet import reactor, task
from twisted.internet.protocol import ClientCreator
from txamqp.protocol import AMQClient
from txamqp.client import TwistedDelegate
from txamqp.content import Content
import txamqp.spec

@deferredGenerator
def writeMetric(metric_path, value, timestamp, host, port, username, password,
                vhost, exchange, spec=None, channel_number=1, ssl=False):

    if not spec:
        spec = txamqp.spec.load(os.path.normpath(
            os.path.join(os.path.dirname(__file__), 'amqp0-8.xml')))

    delegate = TwistedDelegate()

    connector = ClientCreator(reactor, AMQClient, delegate=delegate,
                              vhost=vhost, spec=spec)
    if ssl:
        from twisted.internet.ssl import ClientContextFactory
        wfd = waitForDeferred(connector.connectSSL(host, port, 
                                                   ClientContextFactory()))
        yield wfd
        conn = wfd.getResult()
    else:
        wfd = waitForDeferred(connector.connectTCP(host, port))
        yield wfd
        conn = wfd.getResult()

    wfd = waitForDeferred(conn.authenticate(username, password))
    yield wfd

    wfd = waitForDeferred(conn.channel(channel_number))
    yield wfd
    channel = wfd.getResult()

    wfd = waitForDeferred(channel.channel_open())
    yield wfd

    wfd = waitForDeferred(channel.exchange_declare(exchange=exchange,
                                                   type="topic",
                                                   durable=True, 
                                                   auto_delete=False))
    yield wfd

    message = Content( "%f %d" % (value, timestamp) )
    message["delivery mode"] = 2

    channel.basic_publish(exchange=exchange, content=message,
                          routing_key=metric_path)
    wfd = waitForDeferred(channel.channel_close())
    yield wfd

def main():
    parser = OptionParser(usage="%prog [options] <metric> <value> [timestamp]")
    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("-s", "--ssl", dest="ssl",
                      help="ssl", metavar="SSL", action="store_true",
                      default=False)

    parser.add_option("-e", "--exchange", dest="exchange",
                      help="exchange", metavar="EXCHANGE",
                      default="graphite")

    (options, args) = parser.parse_args()

    try:
      metric_path = args[0]
      value = float(args[1])

      if len(args) > 2:
        timestamp = int(args[2])
      else:
        timestamp = time.time()

    except:
      parser.print_usage()
      raise SystemExit(1)

    d = writeMetric(metric_path, value, timestamp, options.host, options.port,
                    options.username, options.password, vhost=options.vhost,
                    exchange=options.exchange, ssl=options.ssl)
    d.addErrback(lambda f: f.printTraceback())
    d.addBoth(lambda _: reactor.stop())
    reactor.run()

if __name__ == "__main__":
    main()