Synnefo

# Copyright 2012 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import pika

import json

import uuid

from urlparse import urlparse

from hashlib import sha1

from random import random

from time import time

def exchange_connect(exchange, vhost='/'):

    """Format exchange as a URI: rabbitmq://user:pass@host:port/exchange"""

    parts = urlparse(exchange)

    if parts.scheme != 'rabbitmq':

        return None

    if len(parts.path) < 2 or not parts.path.startswith('/'):

        return None

    exchange = parts.path[1:]

    connection = pika.BlockingConnection(pika.ConnectionParameters(

                    host=parts.hostname, port=parts.port, virtual_host=vhost,

                    credentials=pika.PlainCredentials(parts.username, parts.password)))

    channel = connection.channel()

    channel.exchange_declare(exchange=exchange, type='topic', durable=True)

    return (connection, channel, exchange)

def exchange_close(conn):

    connection, channel, exchange = conn

    connection.close()

def exchange_send(conn, key, value):

    """Messages are sent to exchanges at a key."""

    connection, channel, exchange = conn

    channel.basic_publish(exchange=exchange,

                          routing_key=key,

                          body=json.dumps(value))

def exchange_route(conn, key, queue):

    """Set up routing of keys to queue."""

    connection, channel, exchange = conn

    channel.queue_declare(queue=queue, durable=True,

                          exclusive=False, auto_delete=False)

    channel.queue_bind(exchange=exchange,

                       queue=queue,

                       routing_key=key)

def queue_callback(conn, queue, cb):

    def handle_delivery(channel, method_frame, header_frame, body):

        #print 'Basic.Deliver %s delivery-tag %i: %s' % (header_frame.content_type,

        #                                                method_frame.delivery_tag,

        #                                                body)

        if cb:

            cb(json.loads(body))

        channel.basic_ack(delivery_tag=method_frame.delivery_tag)

    connection, channel, exchange = conn

    channel.basic_consume(handle_delivery, queue=queue)

def queue_start(conn):

    connection, channel, exchange = conn

    channel.start_consuming()

class Receipt(object):

    def __init__(self, client, user, instance, resource, value, details={}):

        self.eventVersion = '1.0'

        self.occurredMillis = int(time() * 1000)

        self.receivedMillis = self.occurredMillis

        self.clientID = client

        self.userID = user

        self.instanceID = instance

        self.resource = resource

        self.value = value

        self.details = details

        hash = sha1()

        hash.update(json.dumps([client, user, resource, value, details, random()]))

        self.id = hash.hexdigest()

    def format(self):

        return self.__dict__