/usr/share/pyshared/qpid/management.py is in python-qpid 0.22+dfsg-1.
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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.
#
###############################################################################
## This file is being obsoleted by qmf/console.py
###############################################################################
"""
Management API for Qpid
"""
import qpid
import struct
import socket
from threading import Thread
from datatypes import Message, RangedSet
from time import time
from cStringIO import StringIO
from codec010 import StringCodec as Codec
from threading import Lock, Condition
class SequenceManager:
""" Manage sequence numbers for asynchronous method calls """
def __init__ (self):
self.lock = Lock ()
self.sequence = 0
self.pending = {}
def reserve (self, data):
""" Reserve a unique sequence number """
self.lock.acquire ()
result = self.sequence
self.sequence = self.sequence + 1
self.pending[result] = data
self.lock.release ()
return result
def release (self, seq):
""" Release a reserved sequence number """
data = None
self.lock.acquire ()
if seq in self.pending:
data = self.pending[seq]
del self.pending[seq]
self.lock.release ()
return data
class mgmtObject (object):
""" Generic object that holds the contents of a management object with its
attributes set as object attributes. """
def __init__ (self, classKey, timestamps, row):
self.classKey = classKey
self.timestamps = timestamps
for cell in row:
setattr (self, cell[0], cell[1])
class objectId(object):
""" Object that represents QMF object identifiers """
def __init__(self, codec, first=0, second=0):
if codec:
self.first = codec.read_uint64()
self.second = codec.read_uint64()
else:
self.first = first
self.second = second
def __cmp__(self, other):
if other == None:
return 1
if self.first < other.first:
return -1
if self.first > other.first:
return 1
if self.second < other.second:
return -1
if self.second > other.second:
return 1
return 0
def index(self):
return (self.first, self.second)
def getFlags(self):
return (self.first & 0xF000000000000000) >> 60
def getSequence(self):
return (self.first & 0x0FFF000000000000) >> 48
def getBroker(self):
return (self.first & 0x0000FFFFF0000000) >> 28
def getBank(self):
return self.first & 0x000000000FFFFFFF
def getObject(self):
return self.second
def isDurable(self):
return self.getSequence() == 0
def encode(self, codec):
codec.write_uint64(self.first)
codec.write_uint64(self.second)
class methodResult:
""" Object that contains the result of a method call """
def __init__ (self, status, sText, args):
self.status = status
self.statusText = sText
for arg in args:
setattr (self, arg, args[arg])
class brokerInfo:
""" Object that contains information about a broker and the session to it """
def __init__ (self, brokerId, sessionId):
self.brokerId = brokerId
self.sessionId = sessionId
class managementChannel:
""" This class represents a connection to an AMQP broker. """
def __init__ (self, ssn, topicCb, replyCb, exceptionCb, cbContext, _detlife=0):
""" Given a channel on an established AMQP broker connection, this method
opens a session and performs all of the declarations and bindings needed
to participate in the management protocol. """
self.enabled = True
self.ssn = ssn
self.sessionId = ssn.name
self.topicName = "mgmt-%s" % self.sessionId
self.replyName = "repl-%s" % self.sessionId
self.qpidChannel = ssn
self.tcb = topicCb
self.rcb = replyCb
self.ecb = exceptionCb
self.context = cbContext
self.reqsOutstanding = 0
self.brokerInfo = None
ssn.auto_sync = False
ssn.queue_declare (queue=self.topicName, exclusive=True, auto_delete=True)
ssn.queue_declare (queue=self.replyName, exclusive=True, auto_delete=True)
ssn.exchange_bind (exchange="amq.direct",
queue=self.replyName, binding_key=self.replyName)
ssn.message_subscribe (queue=self.topicName, destination="tdest",
accept_mode=ssn.accept_mode.none,
acquire_mode=ssn.acquire_mode.pre_acquired)
ssn.message_subscribe (queue=self.replyName, destination="rdest",
accept_mode=ssn.accept_mode.none,
acquire_mode=ssn.acquire_mode.pre_acquired)
ssn.incoming ("tdest").listen (self.topicCb, self.exceptionCb)
ssn.incoming ("rdest").listen (self.replyCb)
ssn.message_set_flow_mode (destination="tdest", flow_mode=1)
ssn.message_flow (destination="tdest", unit=0, value=0xFFFFFFFFL)
ssn.message_flow (destination="tdest", unit=1, value=0xFFFFFFFFL)
ssn.message_set_flow_mode (destination="rdest", flow_mode=1)
ssn.message_flow (destination="rdest", unit=0, value=0xFFFFFFFFL)
ssn.message_flow (destination="rdest", unit=1, value=0xFFFFFFFFL)
def setBrokerInfo (self, data):
self.brokerInfo = data
def shutdown (self):
self.enabled = False
self.ssn.incoming("tdest").stop()
self.ssn.incoming("rdest").stop()
def topicCb (self, msg):
""" Receive messages via the topic queue on this channel. """
if self.enabled:
self.tcb (self, msg)
self.ssn.receiver._completed.add(msg.id)
self.ssn.channel.session_completed(self.ssn.receiver._completed)
def replyCb (self, msg):
""" Receive messages via the reply queue on this channel. """
if self.enabled:
self.rcb (self, msg)
self.ssn.receiver._completed.add(msg.id)
self.ssn.channel.session_completed(self.ssn.receiver._completed)
def exceptionCb (self, data):
if self.ecb != None:
self.ecb (self, data)
def send (self, exchange, msg):
if self.enabled:
self.qpidChannel.message_transfer (destination=exchange, message=msg)
def message (self, body, routing_key="broker"):
dp = self.qpidChannel.delivery_properties()
dp.routing_key = routing_key
mp = self.qpidChannel.message_properties()
mp.content_type = "application/octet-stream"
mp.reply_to = self.qpidChannel.reply_to("amq.direct", self.replyName)
return Message(dp, mp, body)
class managementClient:
""" This class provides an API for access to management data on the AMQP
network. It implements the management protocol and manages the management
schemas as advertised by the various management agents in the network. """
CTRL_BROKER_INFO = 1
CTRL_SCHEMA_LOADED = 2
CTRL_USER = 3
CTRL_HEARTBEAT = 4
SYNC_TIME = 10.0
#========================================================
# User API - interacts with the class's user
#========================================================
def __init__ (self, unused=None, ctrlCb=None, configCb=None, instCb=None, methodCb=None, closeCb=None):
self.ctrlCb = ctrlCb
self.configCb = configCb
self.instCb = instCb
self.methodCb = methodCb
self.closeCb = closeCb
self.schemaCb = None
self.eventCb = None
self.channels = []
self.seqMgr = SequenceManager ()
self.schema = {}
self.packages = {}
self.cv = Condition ()
self.syncInFlight = False
self.syncSequence = 0
self.syncResult = None
def schemaListener (self, schemaCb):
""" Optionally register a callback to receive details of the schema of
managed objects in the network. """
self.schemaCb = schemaCb
def eventListener (self, eventCb):
""" Optionally register a callback to receive events from managed objects
in the network. """
self.eventCb = eventCb
def addChannel (self, channel, cbContext=None):
""" Register a new channel. """
mch = managementChannel (channel, self.topicCb, self.replyCb, self.exceptCb, cbContext)
self.channels.append (mch)
self.incOutstanding (mch)
codec = Codec ()
self.setHeader (codec, ord ('B'))
msg = mch.message(codec.encoded)
mch.send ("qpid.management", msg)
return mch
def removeChannel (self, mch):
""" Remove a previously added channel from management. """
mch.shutdown ()
self.channels.remove (mch)
def callMethod (self, channel, userSequence, objId, className, methodName, args=None):
""" Invoke a method on a managed object. """
self.method (channel, userSequence, objId, className, methodName, args)
def getObjects (self, channel, userSequence, className, bank=0):
""" Request immediate content from broker """
codec = Codec ()
self.setHeader (codec, ord ('G'), userSequence)
ft = {}
ft["_class"] = className
codec.write_map (ft)
msg = channel.message(codec.encoded, routing_key="agent.1.%d" % bank)
channel.send ("qpid.management", msg)
def syncWaitForStable (self, channel):
""" Synchronous (blocking) call to wait for schema stability on a channel """
self.cv.acquire ()
if channel.reqsOutstanding == 0:
self.cv.release ()
return channel.brokerInfo
self.syncInFlight = True
starttime = time ()
while channel.reqsOutstanding != 0:
self.cv.wait (self.SYNC_TIME)
if time () - starttime > self.SYNC_TIME:
self.cv.release ()
raise RuntimeError ("Timed out waiting for response on channel")
self.cv.release ()
return channel.brokerInfo
def syncCallMethod (self, channel, objId, className, methodName, args=None):
""" Synchronous (blocking) method call """
self.cv.acquire ()
self.syncInFlight = True
self.syncResult = None
self.syncSequence = self.seqMgr.reserve ("sync")
self.cv.release ()
self.callMethod (channel, self.syncSequence, objId, className, methodName, args)
self.cv.acquire ()
starttime = time ()
while self.syncInFlight:
self.cv.wait (self.SYNC_TIME)
if time () - starttime > self.SYNC_TIME:
self.cv.release ()
raise RuntimeError ("Timed out waiting for response on channel")
result = self.syncResult
self.cv.release ()
return result
def syncGetObjects (self, channel, className, bank=0):
""" Synchronous (blocking) get call """
self.cv.acquire ()
self.syncInFlight = True
self.syncResult = []
self.syncSequence = self.seqMgr.reserve ("sync")
self.cv.release ()
self.getObjects (channel, self.syncSequence, className, bank)
self.cv.acquire ()
starttime = time ()
while self.syncInFlight:
self.cv.wait (self.SYNC_TIME)
if time () - starttime > self.SYNC_TIME:
self.cv.release ()
raise RuntimeError ("Timed out waiting for response on channel")
result = self.syncResult
self.cv.release ()
return result
#========================================================
# Channel API - interacts with registered channel objects
#========================================================
def topicCb (self, ch, msg):
""" Receive messages via the topic queue of a particular channel. """
codec = Codec (msg.body)
while True:
hdr = self.checkHeader (codec)
if hdr == None:
return
if hdr[0] == 'p':
self.handlePackageInd (ch, codec)
elif hdr[0] == 'q':
self.handleClassInd (ch, codec)
elif hdr[0] == 'h':
self.handleHeartbeat (ch, codec)
elif hdr[0] == 'e':
self.handleEvent (ch, codec)
else:
self.parse (ch, codec, hdr[0], hdr[1])
def replyCb (self, ch, msg):
""" Receive messages via the reply queue of a particular channel. """
codec = Codec (msg.body)
while True:
hdr = self.checkHeader (codec)
if hdr == None:
return
if hdr[0] == 'm':
self.handleMethodReply (ch, codec, hdr[1])
elif hdr[0] == 'z':
self.handleCommandComplete (ch, codec, hdr[1])
elif hdr[0] == 'b':
self.handleBrokerResponse (ch, codec)
elif hdr[0] == 'p':
self.handlePackageInd (ch, codec)
elif hdr[0] == 'q':
self.handleClassInd (ch, codec)
else:
self.parse (ch, codec, hdr[0], hdr[1])
def exceptCb (self, ch, data):
if self.closeCb != None:
self.closeCb (ch.context, data)
#========================================================
# Internal Functions
#========================================================
def setHeader (self, codec, opcode, seq = 0):
""" Compose the header of a management message. """
codec.write_uint8 (ord ('A'))
codec.write_uint8 (ord ('M'))
codec.write_uint8 (ord ('2'))
codec.write_uint8 (opcode)
codec.write_uint32 (seq)
def checkHeader (self, codec):
""" Check the header of a management message and extract the opcode and class. """
try:
octet = chr (codec.read_uint8 ())
if octet != 'A':
return None
octet = chr (codec.read_uint8 ())
if octet != 'M':
return None
octet = chr (codec.read_uint8 ())
if octet != '2':
return None
opcode = chr (codec.read_uint8 ())
seq = codec.read_uint32 ()
return (opcode, seq)
except:
return None
def encodeValue (self, codec, value, typecode):
""" Encode, into the codec, a value based on its typecode. """
if typecode == 1:
codec.write_uint8 (int (value))
elif typecode == 2:
codec.write_uint16 (int (value))
elif typecode == 3:
codec.write_uint32 (long (value))
elif typecode == 4:
codec.write_uint64 (long (value))
elif typecode == 5:
codec.write_uint8 (int (value))
elif typecode == 6:
codec.write_str8 (value)
elif typecode == 7:
codec.write_str16 (value)
elif typecode == 8: # ABSTIME
codec.write_uint64 (long (value))
elif typecode == 9: # DELTATIME
codec.write_uint64 (long (value))
elif typecode == 10: # REF
value.encode(codec)
elif typecode == 11: # BOOL
codec.write_uint8 (int (value))
elif typecode == 12: # FLOAT
codec.write_float (float (value))
elif typecode == 13: # DOUBLE
codec.write_double (float (value))
elif typecode == 14: # UUID
codec.write_uuid (value)
elif typecode == 15: # FTABLE
codec.write_map (value)
elif typecode == 16:
codec.write_int8 (int(value))
elif typecode == 17:
codec.write_int16 (int(value))
elif typecode == 18:
codec.write_int32 (int(value))
elif typecode == 19:
codec.write_int64 (int(value))
else:
raise ValueError ("Invalid type code: %d" % typecode)
def decodeValue (self, codec, typecode):
""" Decode, from the codec, a value based on its typecode. """
if typecode == 1:
data = codec.read_uint8 ()
elif typecode == 2:
data = codec.read_uint16 ()
elif typecode == 3:
data = codec.read_uint32 ()
elif typecode == 4:
data = codec.read_uint64 ()
elif typecode == 5:
data = codec.read_uint8 ()
elif typecode == 6:
data = codec.read_str8 ()
elif typecode == 7:
data = codec.read_str16 ()
elif typecode == 8: # ABSTIME
data = codec.read_uint64 ()
elif typecode == 9: # DELTATIME
data = codec.read_uint64 ()
elif typecode == 10: # REF
data = objectId(codec)
elif typecode == 11: # BOOL
data = codec.read_uint8 ()
elif typecode == 12: # FLOAT
data = codec.read_float ()
elif typecode == 13: # DOUBLE
data = codec.read_double ()
elif typecode == 14: # UUID
data = codec.read_uuid ()
elif typecode == 15: # FTABLE
data = codec.read_map ()
elif typecode == 16:
data = codec.read_int8 ()
elif typecode == 17:
data = codec.read_int16 ()
elif typecode == 18:
data = codec.read_int32 ()
elif typecode == 19:
data = codec.read_int64 ()
else:
raise ValueError ("Invalid type code: %d" % typecode)
return data
def incOutstanding (self, ch):
self.cv.acquire ()
ch.reqsOutstanding = ch.reqsOutstanding + 1
self.cv.release ()
def decOutstanding (self, ch):
self.cv.acquire ()
ch.reqsOutstanding = ch.reqsOutstanding - 1
if ch.reqsOutstanding == 0 and self.syncInFlight:
self.syncInFlight = False
self.cv.notify ()
self.cv.release ()
if ch.reqsOutstanding == 0:
if self.ctrlCb != None:
self.ctrlCb (ch.context, self.CTRL_SCHEMA_LOADED, None)
ch.ssn.exchange_bind (exchange="qpid.management",
queue=ch.topicName, binding_key="console.#")
ch.ssn.exchange_bind (exchange="qpid.management",
queue=ch.topicName, binding_key="schema.#")
def handleMethodReply (self, ch, codec, sequence):
status = codec.read_uint32 ()
sText = codec.read_str16 ()
data = self.seqMgr.release (sequence)
if data == None:
return
(userSequence, classId, methodName) = data
args = {}
context = self.seqMgr.release (userSequence)
if status == 0:
schemaClass = self.schema[classId]
ms = schemaClass['M']
arglist = None
for mname in ms:
(mdesc, margs) = ms[mname]
if mname == methodName:
arglist = margs
if arglist == None:
return
for arg in arglist:
if arg[2].find("O") != -1:
args[arg[0]] = self.decodeValue (codec, arg[1])
if context == "sync" and userSequence == self.syncSequence:
self.cv.acquire ()
self.syncInFlight = False
self.syncResult = methodResult (status, sText, args)
self.cv.notify ()
self.cv.release ()
elif self.methodCb != None:
self.methodCb (ch.context, userSequence, status, sText, args)
def handleCommandComplete (self, ch, codec, seq):
code = codec.read_uint32 ()
text = codec.read_str8 ()
data = (seq, code, text)
context = self.seqMgr.release (seq)
if context == "outstanding":
self.decOutstanding (ch)
elif context == "sync" and seq == self.syncSequence:
self.cv.acquire ()
self.syncInFlight = False
self.cv.notify ()
self.cv.release ()
elif self.ctrlCb != None:
self.ctrlCb (ch.context, self.CTRL_USER, data)
def handleBrokerResponse (self, ch, codec):
uuid = codec.read_uuid ()
ch.brokerInfo = brokerInfo (uuid, ch.sessionId)
if self.ctrlCb != None:
self.ctrlCb (ch.context, self.CTRL_BROKER_INFO, ch.brokerInfo)
# Send a package request
sendCodec = Codec ()
seq = self.seqMgr.reserve ("outstanding")
self.setHeader (sendCodec, ord ('P'), seq)
smsg = ch.message(sendCodec.encoded)
ch.send ("qpid.management", smsg)
def handlePackageInd (self, ch, codec):
pname = codec.read_str8 ()
if pname not in self.packages:
self.packages[pname] = {}
# Send a class request
sendCodec = Codec ()
seq = self.seqMgr.reserve ("outstanding")
self.setHeader (sendCodec, ord ('Q'), seq)
self.incOutstanding (ch)
sendCodec.write_str8 (pname)
smsg = ch.message(sendCodec.encoded)
ch.send ("qpid.management", smsg)
def handleClassInd (self, ch, codec):
kind = codec.read_uint8()
if kind != 1: # This API doesn't handle new-style events
return
pname = codec.read_str8()
cname = codec.read_str8()
hash = codec.read_bin128()
if pname not in self.packages:
return
if (cname, hash) not in self.packages[pname]:
# Send a schema request
sendCodec = Codec ()
seq = self.seqMgr.reserve ("outstanding")
self.setHeader (sendCodec, ord ('S'), seq)
self.incOutstanding (ch)
sendCodec.write_str8 (pname)
sendCodec.write_str8 (cname)
sendCodec.write_bin128 (hash)
smsg = ch.message(sendCodec.encoded)
ch.send ("qpid.management", smsg)
def handleHeartbeat (self, ch, codec):
timestamp = codec.read_uint64()
if self.ctrlCb != None:
self.ctrlCb (ch.context, self.CTRL_HEARTBEAT, timestamp)
def handleEvent (self, ch, codec):
if self.eventCb == None:
return
timestamp = codec.read_uint64()
objId = objectId(codec)
packageName = codec.read_str8()
className = codec.read_str8()
hash = codec.read_bin128()
name = codec.read_str8()
classKey = (packageName, className, hash)
if classKey not in self.schema:
return;
schemaClass = self.schema[classKey]
row = []
es = schemaClass['E']
arglist = None
for ename in es:
(edesc, eargs) = es[ename]
if ename == name:
arglist = eargs
if arglist == None:
return
for arg in arglist:
row.append((arg[0], self.decodeValue(codec, arg[1])))
self.eventCb(ch.context, classKey, objId, name, row)
def parseSchema (self, ch, codec):
""" Parse a received schema-description message. """
self.decOutstanding (ch)
kind = codec.read_uint8()
if kind != 1: # This API doesn't handle new-style events
return
packageName = codec.read_str8 ()
className = codec.read_str8 ()
hash = codec.read_bin128 ()
hasSupertype = 0 #codec.read_uint8()
configCount = codec.read_uint16 ()
instCount = codec.read_uint16 ()
methodCount = codec.read_uint16 ()
if hasSupertype != 0:
supertypePackage = codec.read_str8()
supertypeClass = codec.read_str8()
supertypeHash = codec.read_bin128()
if packageName not in self.packages:
return
if (className, hash) in self.packages[packageName]:
return
classKey = (packageName, className, hash)
if classKey in self.schema:
return
configs = []
insts = []
methods = {}
configs.append (("id", 4, "", "", 1, 1, None, None, None, None, None))
insts.append (("id", 4, None, None))
for idx in range (configCount):
ft = codec.read_map ()
name = str (ft["name"])
type = ft["type"]
access = ft["access"]
index = ft["index"]
optional = ft["optional"]
unit = None
min = None
max = None
maxlen = None
desc = None
for key, value in ft.items ():
if key == "unit":
unit = str (value)
elif key == "min":
min = value
elif key == "max":
max = value
elif key == "maxlen":
maxlen = value
elif key == "desc":
desc = str (value)
config = (name, type, unit, desc, access, index, min, max, maxlen, optional)
configs.append (config)
for idx in range (instCount):
ft = codec.read_map ()
name = str (ft["name"])
type = ft["type"]
unit = None
desc = None
for key, value in ft.items ():
if key == "unit":
unit = str (value)
elif key == "desc":
desc = str (value)
inst = (name, type, unit, desc)
insts.append (inst)
for idx in range (methodCount):
ft = codec.read_map ()
mname = str (ft["name"])
argCount = ft["argCount"]
if "desc" in ft:
mdesc = str (ft["desc"])
else:
mdesc = None
args = []
for aidx in range (argCount):
ft = codec.read_map ()
name = str (ft["name"])
type = ft["type"]
dir = str (ft["dir"].upper ())
unit = None
min = None
max = None
maxlen = None
desc = None
default = None
for key, value in ft.items ():
if key == "unit":
unit = str (value)
elif key == "min":
min = value
elif key == "max":
max = value
elif key == "maxlen":
maxlen = value
elif key == "desc":
desc = str (value)
elif key == "default":
default = str (value)
arg = (name, type, dir, unit, desc, min, max, maxlen, default)
args.append (arg)
methods[mname] = (mdesc, args)
schemaClass = {}
schemaClass['C'] = configs
schemaClass['I'] = insts
schemaClass['M'] = methods
self.schema[classKey] = schemaClass
if self.schemaCb != None:
self.schemaCb (ch.context, classKey, configs, insts, methods, {})
def parsePresenceMasks(self, codec, schemaClass):
""" Generate a list of not-present properties """
excludeList = []
bit = 0
for element in schemaClass['C'][1:]:
if element[9] == 1:
if bit == 0:
mask = codec.read_uint8()
bit = 1
if (mask & bit) == 0:
excludeList.append(element[0])
bit = bit * 2
if bit == 256:
bit = 0
return excludeList
def parseContent (self, ch, cls, codec, seq=0):
""" Parse a received content message. """
if (cls == 'C' or (cls == 'B' and seq == 0)) and self.configCb == None:
return
if cls == 'I' and self.instCb == None:
return
packageName = codec.read_str8 ()
className = codec.read_str8 ()
hash = codec.read_bin128 ()
classKey = (packageName, className, hash)
if classKey not in self.schema:
return
row = []
timestamps = []
timestamps.append (codec.read_uint64 ()) # Current Time
timestamps.append (codec.read_uint64 ()) # Create Time
timestamps.append (codec.read_uint64 ()) # Delete Time
objId = objectId(codec)
schemaClass = self.schema[classKey]
if cls == 'C' or cls == 'B':
notPresent = self.parsePresenceMasks(codec, schemaClass)
if cls == 'C' or cls == 'B':
row.append(("id", objId))
for element in schemaClass['C'][1:]:
tc = element[1]
name = element[0]
if name in notPresent:
row.append((name, None))
else:
data = self.decodeValue(codec, tc)
row.append((name, data))
if cls == 'I' or cls == 'B':
if cls == 'I':
row.append(("id", objId))
for element in schemaClass['I'][1:]:
tc = element[1]
name = element[0]
data = self.decodeValue (codec, tc)
row.append ((name, data))
if cls == 'C' or (cls == 'B' and seq != self.syncSequence):
self.configCb (ch.context, classKey, row, timestamps)
elif cls == 'B' and seq == self.syncSequence:
if timestamps[2] == 0:
obj = mgmtObject (classKey, timestamps, row)
self.syncResult.append (obj)
elif cls == 'I':
self.instCb (ch.context, classKey, row, timestamps)
def parse (self, ch, codec, opcode, seq):
""" Parse a message received from the topic queue. """
if opcode == 's':
self.parseSchema (ch, codec)
elif opcode == 'c':
self.parseContent (ch, 'C', codec)
elif opcode == 'i':
self.parseContent (ch, 'I', codec)
elif opcode == 'g':
self.parseContent (ch, 'B', codec, seq)
else:
raise ValueError ("Unknown opcode: %c" % opcode);
def method (self, channel, userSequence, objId, classId, methodName, args):
""" Invoke a method on an object """
codec = Codec ()
sequence = self.seqMgr.reserve ((userSequence, classId, methodName))
self.setHeader (codec, ord ('M'), sequence)
objId.encode(codec)
codec.write_str8 (classId[0])
codec.write_str8 (classId[1])
codec.write_bin128 (classId[2])
codec.write_str8 (methodName)
bank = "%d.%d" % (objId.getBroker(), objId.getBank())
# Encode args according to schema
if classId not in self.schema:
self.seqMgr.release (sequence)
raise ValueError ("Unknown class name: %s" % classId)
schemaClass = self.schema[classId]
ms = schemaClass['M']
arglist = None
for mname in ms:
(mdesc, margs) = ms[mname]
if mname == methodName:
arglist = margs
if arglist == None:
self.seqMgr.release (sequence)
raise ValueError ("Unknown method name: %s" % methodName)
for arg in arglist:
if arg[2].find("I") != -1:
value = arg[8] # default
if arg[0] in args:
value = args[arg[0]]
if value == None:
self.seqMgr.release (sequence)
raise ValueError ("Missing non-defaulted argument: %s" % arg[0])
self.encodeValue (codec, value, arg[1])
packageName = classId[0]
className = classId[1]
msg = channel.message(codec.encoded, "agent." + bank)
channel.send ("qpid.management", msg)
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