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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
#
"""
Management classes for AMQP
"""
import qpid
import base64
import socket
from threading import Thread
from message import Message
from time import sleep
from qpid.client import Client
from qpid.content import Content
from cStringIO import StringIO
from codec import Codec, EOF
#===================================================================
# ManagementMetadata
#
# One instance of this class is created for each ManagedBroker. It
# is used to store metadata from the broker which is needed for the
# proper interpretation of recevied management content.
#
#===================================================================
class ManagementMetadata:
def parseSchema (self, cls, oid, len, codec):
#print "Schema Record: objId=", oid
config = []
inst = []
while 1:
flags = codec.decode_octet ()
if flags == 0x80:
break
tc = codec.decode_octet ()
name = codec.decode_shortstr ()
desc = codec.decode_shortstr ()
if flags & 1: # TODO: Define constants for these
config.append ((tc, name, desc))
if (flags & 1) == 0 or (flags & 2) == 2:
inst.append ((tc, name, desc))
# TODO: Handle notification of schema change outbound
self.schema[(oid,'C')] = config
self.schema[(oid,'I')] = inst
def parseContent (self, cls, oid, len, codec):
#print "Content Record: Class=", cls, ", objId=", oid
if cls == 'C' and self.broker.config_cb == None:
return
if cls == 'I' and self.broker.inst_cb == None:
return
if (oid,cls) not in self.schema:
return
row = []
timestamps = []
timestamps.append (codec.decode_longlong ()); # Current Time
timestamps.append (codec.decode_longlong ()); # Create Time
timestamps.append (codec.decode_longlong ()); # Delete Time
for element in self.schema[(oid,cls)][:]:
tc = element[0]
name = element[1]
if tc == 1: # TODO: Define constants for these
data = codec.decode_octet ()
elif tc == 2:
data = codec.decode_short ()
elif tc == 3:
data = codec.decode_long ()
elif tc == 4:
data = codec.decode_longlong ()
elif tc == 5:
data = codec.decode_octet ()
elif tc == 6:
data = codec.decode_shortstr ()
row.append ((name, data))
if cls == 'C':
self.broker.config_cb[1] (self.broker.config_cb[0], oid, row, timestamps)
if cls == 'I':
self.broker.inst_cb[1] (self.broker.inst_cb[0], oid, row, timestamps)
def parse (self, codec):
try:
opcode = chr (codec.decode_octet ())
except EOF:
return 0
cls = chr (codec.decode_octet ())
oid = codec.decode_short ()
len = codec.decode_long ()
if len < 8:
raise ValueError ("parse error: value of length field too small")
if opcode == 'S':
self.parseSchema (cls, oid, len, codec)
if opcode == 'C':
self.parseContent (cls, oid, len, codec)
return 1
def __init__ (self, broker):
self.broker = broker
self.schema = {}
#===================================================================
# ManagedBroker
#
# An object of this class represents a connection (over AMQP) to a
# single managed broker.
#
#===================================================================
class ManagedBroker:
exchange = "qpid.management"
def checkHeader (self, codec):
octet = chr (codec.decode_octet ())
if octet != 'A':
return 0
octet = chr (codec.decode_octet ())
if octet != 'M':
return 0
octet = chr (codec.decode_octet ())
if octet != '0':
return 0
octet = chr (codec.decode_octet ())
if octet != '1':
return 0
return 1
def receive_cb (self, msg):
codec = Codec (StringIO (msg.content.body), self.spec)
if self.checkHeader (codec) == 0:
raise ValueError ("outer header invalid");
while self.metadata.parse (codec):
pass
msg.complete ()
def __init__ (self, host = "localhost", port = 5672,
username = "guest", password = "guest"):
self.spec = qpid.spec.load ("../specs/amqp.0-10-preview.xml")
self.client = None
self.channel = None
self.queue = None
self.qname = None
self.metadata = ManagementMetadata (self)
# Initialize the callback records
self.schema_cb = None
self.config_cb = None
self.inst_cb = None
self.host = host
self.port = port
self.username = username
self.password = password
def schemaListener (self, context, callback):
self.schema_cb = (context, callback)
def configListener (self, context, callback):
self.config_cb = (context, callback)
def instrumentationListener (self, context, callback):
self.inst_cb = (context, callback)
def start (self):
print "Connecting to broker", self.host
try:
self.client = Client (self.host, self.port, self.spec)
self.client.start ({"LOGIN": self.username, "PASSWORD": self.password})
self.channel = self.client.channel (1)
response = self.channel.session_open (detached_lifetime=300)
self.qname = "mgmt-" + base64.urlsafe_b64encode(response.session_id)
self.channel.queue_declare (queue=self.qname, exclusive=1, auto_delete=1)
self.channel.queue_bind (exchange=ManagedBroker.exchange, queue=self.qname,
routing_key="mgmt")
self.channel.message_subscribe (queue=self.qname, destination="dest")
self.queue = self.client.queue ("dest")
self.queue.listen (self.receive_cb)
self.channel.message_flow_mode (destination="dest", mode=1)
self.channel.message_flow (destination="dest", unit=0, value=0xFFFFFFFF)
self.channel.message_flow (destination="dest", unit=1, value=0xFFFFFFFF)
except socket.error, e:
print "Socket Error Detected:", e[1]
raise
except:
raise
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