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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.
#
# for simplistic UUID - may want to consider something better in the future
require 'securerandom'
# Ruby 1.8 doesn't include SecureRandom#uuid, so let's add it if it's missing
unless SecureRandom.respond_to? :uuid
module SecureRandom
def self.uuid
ary = self.random_bytes(16).unpack("NnnnnN")
ary[2] = (ary[2] & 0x0fff) | 0x4000
ary[3] = (ary[3] & 0x3fff) | 0x8000
"%08x-%04x-%04x-%04x-%04x%08x" % ary
end
end
end
module Qpid
module Management
# This is the primary class that interacts with a Qpid messaging broker for
# querying information from the broker and for configuring it.
class BrokerAgent
# Creates a new BrokerAgent instance. A new Qpid::Messaging::Session,
# Qpid::Messaging::Receiver, and Qpid::Messaging::Sender will be created
# so this instance of the BrokerAgent may send requests to the broker
# and receive replies back.
# @param [Qpid::Messaging::Connection] connection a valid, opened connection
def initialize(connection)
@connection = connection
@session = @connection.create_session()
@reply_to = "qmf.default.topic/direct.#{SecureRandom.uuid}; {node: {type:topic}, link:{x-declare:{auto-delete:True,exclusive:True}}}"
@reply_rx = @session.create_receiver(@reply_to)
@reply_rx.capacity = 10
@tx = @session.create_sender("qmf.default.direct/broker")
end
# Closes the Qpid::Messaging::Session for this BrokerAgent.
def close()
@session.close()
end
# Queries the broker for the Broker QMF object.
# @return [Broker] the broker QMF object
def broker()
find_first_by_class(Broker)
end
# Queries the broker for the Cluster QMF object.
# @return [Cluster] the cluster QMF object
def cluster
find_first_by_class(Cluster)
end
# Queries the broker for the HaBroker QMF object.
# @return [HaBroker] the HA broker QMF object
def ha_broker
find_first_by_class(HaBroker)
end
# Invokes a method on a target object.
# @param [String] method the name of the method to invoke
# @param [Hash] args the arguments to pass to the method
# @param [String] addr the full id of the target object
# @param [Fixnum] timeout the amount of time to wait for the broker to respond to the method invocation
def invoke_method(method, args, addr="org.apache.qpid.broker:broker:amqp-broker", timeout=10)
content = {'_object_id' => {'_object_name' => addr},
'_method_name' => method,
'_arguments' => args}
message = Qpid::Messaging::Message.new()
message.content = content
message.reply_to = @reply_to
message['method'] = 'request'
message['qmf.opcode'] = '_method_request'
message['x-amqp-0-10.app-id'] = 'qmf2'
message.subject = 'broker'
@tx.send(message)
response = @reply_rx.fetch(Qpid::Messaging::Duration.new(timeout * 1000))
@session.acknowledge()
raise "Exception from Agent: #{response.content['_values']}" if response.properties['qmf.opcode'] == '_exception'
raise "Bad response: #{response.properties}" if response.properties['qmf.opcode'] != '_method_response'
return response.content['_arguments']
end
def send_query(query)
message = Qpid::Messaging::Message.new()
message.content = query
message.reply_to = @reply_to
message['method'] = 'request'
message['qmf.opcode'] = '_query_request'
message['x-amqp-0-10.app-id'] = 'qmf2'
message.subject = 'broker'
@tx.send(message)
response = @reply_rx.fetch(Qpid::Messaging::Duration.new(10*1000))
@session.acknowledge()
raise 'Bad response' if response.properties['qmf.opcode'] != '_query_response'
items = response.content
while response.properties.has_key?('partial')
response = @reply_rx.fetch(Qpid::Messaging::Duration.new(10*1000))
items += response.content
@session.acknowledge()
end
return items
end
def find_all_by_class(clazz)
query = {
'_what' => 'OBJECT',
'_schema_id' => {
'_class_name' => BrokerObject.qmf_class(clazz)
}
}
items = send_query(query)
[].tap do |objs|
for item in items
objs << clazz.new(self, item)
end
end
end
def find_first_by_class(clazz)
objects = find_all_by_class(clazz)
return objects[0] if objects.size > 0
return nil
end
def find_by_object_id(clazz, oid)
query = {
'_what' => 'OBJECT',
'_object_id' => {
'_object_name' => oid
}
}
results = send_query(query)
return clazz.new(self, results[0]) if results.count == 1 and not results[0].nil?
# return nil if not found
return nil
end
end
end
end
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