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#
# Author:: Daniel DeLeo (<dan@kallistec.com>)
# Copyright:: Copyright (c) 2009 Daniel DeLeo
# License:: Apache License, Version 2.0
#
# 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.
#
class Chef
module IndexQueue
module Consumer
module ClassMethods
def expose(*methods)
@exposed_methods = Array(@exposed_methods)
@exposed_methods += methods
end
def exposed_methods
@exposed_methods || []
end
def whitelisted?(method_name)
exposed_methods.include?(method_name)
end
end
def self.included(including_class)
including_class.send(:extend, ClassMethods)
end
def run
Chef::Log.debug("Starting Index Queue Consumer")
AmqpClient.instance.queue # triggers connection setup
begin
AmqpClient.instance.queue.subscribe(:ack => true, :timeout => false) do |message|
call_action_for_message(message)
end
rescue Bunny::ConnectionError, Errno::ECONNRESET, Bunny::ServerDownError
AmqpClient.instance.disconnected!
Chef::Log.warn "Connection to rabbitmq lost. attempting to reconnect"
sleep 1
retry
end
end
alias :start :run
def call_action_for_message(message)
amqp_payload = Chef::JSONCompat.from_json(message[:payload], :create_additions => false, :max_nesting => false)
action = amqp_payload["action"].to_sym
app_payload = amqp_payload["payload"]
assert_method_whitelisted(action)
send(action, app_payload)
end
private
def assert_method_whitelisted(method_name)
unless self.class.whitelisted?(method_name)
raise ArgumentError, "non-exposed method #{method_name} called via index queue"
end
end
end
end
end
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