Class: MKIt::DockerListener

Inherits:
Object
  • Object
show all
Includes:
DockerHelper
Defined in:
lib/mkit/docker_listener.rb

Instance Method Summary collapse

Methods included from DockerHelper

#attach_network, #create_instance, #create_network, #create_volume, #delete_volume, #dettach_network, #execute_local, #inspect_instance, #inspect_volume, #logs, #network_exists?, #remove_instance, #remove_network, #start_instance, #stop_instance

Constructor Details

#initialize ⇒ DockerListener

Returns a new instance of DockerListener.



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# File 'lib/mkit/docker_listener.rb', line 11

def initialize
  @consumers = []
end

Instance Method Details

#parse_message(msg) ⇒ Object 



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# File 'lib/mkit/docker_listener.rb', line 18

def parse_message(msg)
  action = msg['Action'].to_sym
  type = msg['Type'].to_sym
  MKItLogger.info("docker <#{type}> <#{action}> received: \n\t#{msg}")
  case type
  when :container
    pod_id = msg.id
    pod_name = msg.Actor.Attributes.name
    pod = Pod.find_by(name: pod_name)
    unless pod.nil?
      case action
      when :create
        pod.pod_id = pod_id
        pod.status = MKIt::Status::CREATED
        pod.save
        pod.service.update_status!
      when :start
        pod.pod_id = pod_id
        pod.save
        pod.service.update_status!
      when :kill
        MKItLogger.debug("	#{type} #{action} <<NOOP / TODO>>")
      when :die
        MKItLogger.debug("	#{type} #{action} <<NOOP / TODO>>")
      when :stop
        pod.service.update_status!
      else
        MKItLogger.debug("	#{type} #{action} <<TODO>>")
      end
    else
      MKItLogger.warn("docker <<#{type}>> <#{action}> received: #{msg}. But I don't know anything about pod #{pod_id}")
    end
  when :network
    pod_id = msg.Actor.Attributes.container
    pod = Pod.find_by(pod_id: pod_id)
    unless pod.nil?
      case action
      when :connect
        MKItLogger.info("docker network #{action} received: #{msg}")
        pod.update_ip
        pod.save
      when :disconnect
        MKItLogger.debug("  #{type} #{action} <<NOOP / TODO>>")
      else
        MKItLogger.debug("  #{type} #{action} <<TODO>>")
      end
    else
      MKItLogger.warn("docker <<#{type}>> <#{action}> received: #{msg}. But I don't know anything about pod #{pod_id}")
    end
  else
    MKItLogger.info("\t#{type} #{action} <<unknown>>")
  end
end

#register_consumer(consumer:) ⇒ Object 



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# File 'lib/mkit/docker_listener.rb', line 15

def register_consumer(consumer:)
end

#start ⇒ Object 



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# File 'lib/mkit/docker_listener.rb', line 72

def start
  @thread ||= Thread.new {
    cmd = "docker events --format '{{json .}}'"
    begin
      PTY.spawn( cmd ) do |stdout, stdin, pid|
        begin
          stdout.each { |line| parse_message JSON.parse(line).to_o }
        rescue Errno::EIO
          MKItLogger.warn("Errno:EIO error, but this probably just means " +
            "that the process has finished giving output")
        end
      end
    rescue PTY::ChildExited
      MKItLogger.warn("docker event listener process exited!")
    end
  }
  @thread.run
  MKItLogger.info("docker listener started")
end

#stop ⇒ Object 



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# File 'lib/mkit/docker_listener.rb', line 91

def stop
  @thread.exit if @thread
  MKItLogger.info("docker listener stopped")
end