/usr/lib/ruby/vendor_ruby/chef/expander/vnode_supervisor.rb is in chef-expander 10.12.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Author:: Daniel DeLeo (<dan@opscode.com>)
# Author:: Seth Falcon (<seth@opscode.com>)
# Author:: Chris Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2010-2011 Opscode, Inc.
# 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.
#
require 'yajl'
require 'eventmachine'
require 'amqp'
require 'mq'
require 'chef/expander/version'
require 'chef/expander/loggable'
require 'chef/expander/node'
require 'chef/expander/vnode'
require 'chef/expander/vnode_table'
require 'chef/expander/configuration'
module ::AMQP
def self.hard_reset!
MQ.reset rescue nil
stop
EM.stop rescue nil
Thread.current[:mq], @conn = nil, nil
end
end
module Chef
module Expander
class VNodeSupervisor
include Loggable
extend Loggable
COULD_NOT_CONNECT = /Could not connect to server/.freeze
def self.start_cluster_worker
@vnode_supervisor = new
@original_ppid = Process.ppid
trap_signals
vnodes = Expander.config.vnode_numbers
$0 = "chef-expander#{Expander.config.ps_tag} worker ##{Expander.config.index} (vnodes #{vnodes.min}-#{vnodes.max})"
AMQP.start(Expander.config.amqp_config) do
start_consumers
await_parent_death
end
end
def self.await_parent_death
@awaiting_parent_death = EM.add_periodic_timer(1) do
unless Process.ppid == @original_ppid
@awaiting_parent_death.cancel
stop_immediately("master process death")
end
end
end
def self.start
@vnode_supervisor = new
trap_signals
Expander.init_config(ARGV)
log.info("Chef Search Expander #{Expander.version} starting up.")
begin
AMQP.start(Expander.config.amqp_config) do
start_consumers
end
rescue AMQP::Error => e
if e.message =~ COULD_NOT_CONNECT
log.error { "Could not connect to rabbitmq. Make sure it is running and correctly configured." }
log.error { e.message }
AMQP.hard_reset!
sleep 5
retry
else
raise
end
end
end
def self.start_consumers
log.debug { "Setting prefetch count to 1"}
MQ.prefetch(1)
vnodes = Expander.config.vnode_numbers
log.info("Starting Consumers for vnodes #{vnodes.min}-#{vnodes.max}")
@vnode_supervisor.start(vnodes)
end
def self.trap_signals
Kernel.trap(:INT) { stop_immediately(:INT) }
Kernel.trap(:TERM) { stop_gracefully(:TERM) }
end
def self.stop_immediately(signal)
log.info { "Initiating immediate shutdown on signal (#{signal})" }
@vnode_supervisor.stop
EM.add_timer(1) do
AMQP.stop
EM.stop
end
end
def self.stop_gracefully(signal)
log.info { "Initiating graceful shutdown on signal (#{signal})" }
@vnode_supervisor.stop
wait_for_http_requests_to_complete
end
def self.wait_for_http_requests_to_complete
if Expander::Solrizer.http_requests_active?
log.info { "waiting for in progress HTTP Requests to complete"}
EM.add_timer(1) do
wait_for_http_requests_to_complete
end
else
log.info { "HTTP requests completed, shutting down"}
AMQP.stop
EM.stop
end
end
attr_reader :vnode_table
attr_reader :local_node
def initialize
@vnodes = {}
@vnode_table = VNodeTable.new(self)
@local_node = Node.local_node
@queue_name, @guid = nil, nil
end
def start(vnode_ids)
@local_node.start do |message|
process_control_message(message)
end
#start_vnode_table_publisher
Array(vnode_ids).each { |vnode_id| spawn_vnode(vnode_id) }
end
def stop
@local_node.stop
#log.debug { "stopping vnode table updater" }
#@vnode_table_publisher.cancel
log.info { "Stopping VNode queue subscribers"}
@vnodes.each do |vnode_number, vnode|
log.debug { "Stopping consumer on VNode #{vnode_number}"}
vnode.stop
end
end
def vnode_added(vnode)
log.debug { "vnode #{vnode.vnode_number} registered with supervisor" }
@vnodes[vnode.vnode_number.to_i] = vnode
end
def vnode_removed(vnode)
log.debug { "vnode #{vnode.vnode_number} unregistered from supervisor" }
@vnodes.delete(vnode.vnode_number.to_i)
end
def vnodes
@vnodes.keys.sort
end
def spawn_vnode(vnode_number)
VNode.new(vnode_number, self).start
end
def release_vnode
# TODO
end
def process_control_message(message)
control_message = parse_symbolic(message)
case control_message[:action]
when "claim_vnode"
spawn_vnode(control_message[:vnode_id])
when "recover_vnode"
recover_vnode(control_message[:vnode_id])
when "release_vnodes"
raise "todo"
release_vnode()
when "update_vnode_table"
@vnode_table.update_table(control_message[:data])
when "vnode_table_publish"
publish_vnode_table
when "status"
publish_status_to(control_message[:rsvp])
when "set_log_level"
set_log_level(control_message[:level], control_message[:rsvp])
else
log.error { "invalid control message #{control_message.inspect}" }
end
rescue Exception => e
log.error { "Error processing a control message."}
log.error { "#{e.class.name}: #{e.message}\n#{e.backtrace.join("\n")}" }
end
def start_vnode_table_publisher
@vnode_table_publisher = EM.add_periodic_timer(10) { publish_vnode_table }
end
def publish_vnode_table
status_update = @local_node.to_hash
status_update[:vnodes] = vnodes
status_update[:update] = :add
@local_node.broadcast_message(Yajl::Encoder.encode({:action => :update_vnode_table, :data => status_update}))
end
def publish_status_to(return_queue)
status_update = @local_node.to_hash
status_update[:vnodes] = vnodes
MQ.queue(return_queue).publish(Yajl::Encoder.encode(status_update))
end
def set_log_level(level, rsvp_to)
log.info { "setting log level to #{level} due to command from #{rsvp_to}" }
new_log_level = (Expander.config.log_level = level.to_sym)
reply = {:level => new_log_level, :node => @local_node.to_hash}
MQ.queue(rsvp_to).publish(Yajl::Encoder.encode(reply))
end
def recover_vnode(vnode_id)
if @vnode_table.local_node_is_leader?
log.debug { "Recovering vnode: #{vnode_id}" }
@local_node.shared_message(Yajl::Encoder.encode({:action => :claim_vnode, :vnode_id => vnode_id}))
else
log.debug { "Ignoring :recover_vnode message because this node is not the leader" }
end
end
def parse_symbolic(message)
Yajl::Parser.new(:symbolize_keys => true).parse(message)
end
end
end
end
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