Class: InstanceAgent::CodeDeployPlugin::CommandPoller

Inherits:
Agent::Base
  • Object
show all
Defined in:
lib/instance_agent/codedeploy_plugin/command_poller.rb

Constant Summary collapse

VERSION = 
"2013-04-23"

Instance Method Summary collapse

Methods inherited from Agent::Base

#description, #log, #run, runner

Constructor Details

#initialize ⇒ CommandPoller

Returns a new instance of CommandPoller.



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 12

def initialize
  region = ENV['AWS_REGION'] || InstanceMetadata.region
  @host_identifier = ENV['AWS_HOST_IDENTIFIER'] || InstanceMetadata.host_identifier

  log(:debug, "Configuring deploy control client: Region = #{region.inspect}")
  log(:debug, "Deploy control endpoint override = " + ENV['AWS_DEPLOY_CONTROL_ENDPOINT'].inspect)

  @deploy_control_client = InstanceAgent::CodeDeployPlugin::CodeDeployControl.new(:region => region, :logger => InstanceAgent::Log, :ssl_ca_directory => ENV['AWS_SSL_CA_DIRECTORY']).get_client

  @plugin = InstanceAgent::CodeDeployPlugin::CommandExecutor.new(
    :deploy_control_client => @deploy_control_client,
    :hook_mapping => create_hook_mapping)

  log(:debug, "Initializing Host Agent: " +
              "Host Identifier = #{@host_identifier}")
end

Instance Method Details

#acknowledge_command(command) ⇒ Object 



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 92

def acknowledge_command(command)
  log(:debug, "Calling PutHostCommandAcknowledgement:")
  output =  @deploy_control_client.put_host_command_acknowledgement(
    :diagnostics => nil,
    :host_command_identifier => command.host_command_identifier)
  status = output.command_status
  log(:debug, "Command Status = #{status}")
  true unless status == "Succeeded" || status == "Failed"
end

#create_hook_mapping ⇒ Object 



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 29

def create_hook_mapping
  #Map commands to lifecycle hooks
  { "BeforeELBRemove"=>["BeforeELBRemove"],
    "AfterELBRemove"=>["AfterELBRemove"],
    "ApplicationStop"=>["ApplicationStop"],
    "BeforeInstall"=>["BeforeInstall"],
    "AfterInstall"=>["AfterInstall"],
    "ApplicationStart"=>["ApplicationStart"],
    "BeforeELBAdd"=>["BeforeELBAdd"],
    "AfterELBAdd"=>["AfterELBAdd"],
    "ValidateService"=>["ValidateService"]}
end

#get_deployment_specification(command) ⇒ Object 



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 102

def get_deployment_specification(command)
  log(:debug, "Calling GetDeploymentSpecification:")
  output =  @deploy_control_client.get_deployment_specification(
    :deployment_execution_id => command.deployment_execution_id,
    :host_identifier => @host_identifier)
  log(:debug, "GetDeploymentSpecification: " +
              "Deployment System = #{output.deployment_system}")
  raise "Deployment System mismatch: #{@plugin.deployment_system} != #{output.deployment_system}" unless @plugin.deployment_system == output.deployment_system
  raise "Deployment Specification missing" if output.deployment_specification.nil?
  output.deployment_specification.generic_envelope
end

#next_command ⇒ Object 



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 74

def next_command
  log(:debug, "Calling PollHostCommand:")
  output = @deploy_control_client.poll_host_command(:host_identifier => @host_identifier)
  command = output.host_command
  if command.nil?
    log(:debug, "PollHostCommand: Host Command =  nil")
  else
    log(:debug, "PollHostCommand: "  +
                "Host Identifier = #{command.host_identifier}; "  +
                "Host Command Identifier = #{command.host_command_identifier}; "  +
                "Deployment Execution ID = #{command.deployment_execution_id}; "  +
                "Command Name = #{command.command_name}")
    raise "Host Identifier mismatch: #{@host_identifier} != #{command.host_identifier}" unless @host_identifier.include? command.host_identifier
    raise "Command Name missing" if command.command_name.nil? || command.command_name.empty?
  end
  command
end

#perform ⇒ Object 



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 42

def perform
  return unless command = next_command
  return unless acknowledge_command(command)

  begin
    spec = get_deployment_specification(command)
    #Successful commands will complete without raising an exception
    script_output = process_command(command, spec)
    log(:debug, 'Calling PutHostCommandComplete: "Succeeded"')
    @deploy_control_client.put_host_command_complete(
      :command_status => 'Succeeded',
      :diagnostics => {:format => "JSON", :payload => gather_diagnostics()},
      :host_command_identifier => command.host_command_identifier)

    #Commands that throw an exception will be considered to have failed
  rescue ScriptError => e
    log(:debug, 'Calling PutHostCommandComplete: "Code Error" ')
    @deploy_control_client.put_host_command_complete(
      :command_status => "Failed",
      :diagnostics => {:format => "JSON", :payload => gather_diagnostics_from_script_error(e)},
      :host_command_identifier => command.host_command_identifier)
    raise e
  rescue Exception => e
    log(:debug, 'Calling PutHostCommandComplete: "Code Error" ')
    @deploy_control_client.put_host_command_complete(
      :command_status => "Failed",
      :diagnostics => {:format => "JSON", :payload => gather_diagnostics_from_error(e)},
      :host_command_identifier => command.host_command_identifier)
    raise e
  end
end

#process_command(command, spec) ⇒ Object 



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# File 'lib/instance_agent/codedeploy_plugin/command_poller.rb', line 114

def process_command(command, spec)
  log(:debug, "Calling #{@plugin.to_s}.execute_command")
  @plugin.execute_command(command, spec)
end