Class: Aerosol::Runner

Inherits:
Object
  • Object
show all
Extended by:
Dockly::Util::Delegate
Includes:
Dockly::Util::Logger::Mixin
Defined in:
lib/aerosol/runner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/aerosol/runner.rb', line 12

def initialize
  @log_pids = {}
end

Instance Attribute Details

#deploy ⇒ Object (readonly)

Returns the value of attribute deploy.



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# File 'lib/aerosol/runner.rb', line 10

def deploy
  @deploy
end

#log_pids ⇒ Object (readonly)

Returns the value of attribute log_pids.



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# File 'lib/aerosol/runner.rb', line 10

def log_pids
  @log_pids
end

Instance Method Details

#check_live_with(session, command) ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 146

def check_live_with(session, command)
  debug "running #{command}"
  ret = ssh_exec!(session, command)
  debug "finished running #{command}"
  ret[:exit_status].zero?
end

#check_site_live(session) ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 133

def check_site_live(session)
  command = [
    'wget',
    '-q',
    # Since we're hitting localhost, the cert will always be invalid, so don't try to check it.
    deploy.ssl ? '--no-check-certificate' : nil,
    "'#{deploy.live_check_url}'",
    '-O',
    '/dev/null'
  ].compact.join(' ')
  check_live_with(session, command)
end

#destroy_new_auto_scaling_groups ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 223

def destroy_new_auto_scaling_groups
  require_deploy!
  info "destroying autoscaling groups created for this sha"
  new_auto_scaling_groups.map(&:destroy)
  info "destroyed new autoscaling groups"
end

#destroy_old_auto_scaling_groups ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 215

def destroy_old_auto_scaling_groups
  require_deploy!
  info "destroying old autoscaling groups"
  sleep deploy.sleep_before_termination
  old_auto_scaling_groups.map(&:destroy)
  info "destroyed old autoscaling groups"
end

#git_sha ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 275

def git_sha
  @git_sha ||= Aerosol::Util.git_sha
end

#healthy?(instance) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aerosol/runner.rb', line 95

def healthy?(instance)
  debug "Checking if #{instance.instance_id} is healthy"

  unless instance.live?
    debug "#{instance.instance_id} is not live"
    return false
  end

  debug "trying to SSH to #{instance.instance_id}"
  success = false
  ssh.with_connection(instance) do |session|
    start_tailing_logs(ssh, instance) if log_pids[instance.instance_id].nil?
    debug "checking if #{instance.instance_id} is healthy"
    success =
      case is_alive?
      when Proc
        debug 'Using custom site live check'
        is_alive?.call(session, self)
      when String
        debug "Using custom site live check: #{is_alive?}"
        check_live_with(session, is_alive?)
      else
        debug 'Using default site live check'
        check_site_live(session)
      end
  end

  if success
    debug "#{instance.instance_id} is healthy"
  else
    debug "#{instance.instance_id} is not healthy"
  end
  success
rescue => ex
  debug "#{instance.instance_id} is not healthy: #{ex.message}"
  false
end

#new_auto_scaling_groups ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 239

def new_auto_scaling_groups
  select_auto_scaling_groups { |asg| asg.tags['GitSha'] == auto_scaling.tags['GitSha'] }
end

#new_instances ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 252

def new_instances
  require_deploy!
  while launch_configuration.all_instances.length < auto_scaling.min_size
    info "Waiting for instances to come up"
    sleep 10
  end
  launch_configuration.all_instances
end

#old_auto_scaling_groups ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 235

def old_auto_scaling_groups
  select_auto_scaling_groups { |asg| asg.tags['GitSha'] != auto_scaling.tags['GitSha'] }
end

#old_instances ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 230

def old_instances
  require_deploy!
  old_auto_scaling_groups.map(&:launch_configuration).compact.map(&:all_instances).flatten.compact
end

#require_deploy! ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 271

def require_deploy!
  raise "@deploy must be present" if deploy.nil?
end

#run_migration ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 16

def run_migration
  require_deploy!
  return unless deploy.migrate?
  raise 'To run a migration, $RAILS_ENV must be set.' if ENV['RAILS_ENV'].nil?

  info "running migration"
  begin
    info "loading config for env #{ENV['RAILS_ENV']}"
    original_config = YAML.load(ERB.new(File.read(db_config_path)).result)[ENV['RAILS_ENV']]
    debug "creating ssh tunnel"
    migration_ssh.with_connection do |session|
      # session.logger.sev_threshold=Logger::Severity::DEBUG
      debug "finding free port"
      port = random_open_port
      db_port = original_config['port'] || 3306 # TODO: get default port from DB driver
      host = original_config['host']
      info "forwarding 127.0.0.1:#{port} --> #{host}:#{db_port}"
      session.forward.local(port, host, db_port)
      child = fork do
        GC.disable
        with_prefix('child:') do |logger|
          logger.debug "establishing connection"
          ActiveRecord::Base.establish_connection(original_config.merge(
                                                    'host' => '127.0.0.1',
                                                    'port' => port
                                                  ))
          logger.info "running migration"
          ActiveRecord::Migrator.migrate(%w[db/migrate])
        end
      end
      debug "waiting for child"
      exitstatus = nil
      session.loop(0.1) do
        pid = Process.waitpid(child, Process::WNOHANG)
        exitstatus = $?.exitstatus if !pid.nil?
        pid.nil?
      end
      raise "migration failed: #{exitstatus}" unless exitstatus == 0
    end
    info "complete"
  ensure
    ActiveRecord::Base.clear_all_connections!
  end
  info "migration ran"
end

#select_auto_scaling_groups(&block) ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 243

def select_auto_scaling_groups(&block)
  require_deploy!
  Aerosol::LaunchConfiguration.all # load all of the launch configurations first
  Aerosol::AutoScaling.all.select { |asg|
    (asg.tags['Deploy'].to_s == auto_scaling.tags['Deploy']) &&
      (block.nil? ? true : block.call(asg))
  }
end

#ssh_fork(command, ssh, instance) ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 163

def ssh_fork(command, ssh, instance)
  debug 'starting ssh fork'
  fork do
    Signal.trap('HUP') do
      debug 'Killing tailing session'
      Process.exit!
    end
    debug 'starting tail'
    begin
      ssh.with_connection(instance) do |session|
        debug 'tailing session connected'
        buffer = ''
        ssh_exec!(session, command) do |stream, data|
          data.lines.each do |line|
            if line.end_with?($/)
              debug "[#{instance.instance_id}] #{stream}: #{buffer + line}"
              buffer = ''
            else
              buffer = line
            end
          end
        end
      end
    rescue => ex
      error "#{ex.class}: #{ex.message}"
      error "#{ex.backtrace.join("\n")}"
    ensure
      debug 'finished'
    end
  end
end

#start_tailing_logs(ssh, instance) ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 153

def start_tailing_logs(ssh, instance)
  if tail_logs && log_files.length > 0
    command = [
      'sudo', 'tail', '-f', *log_files
    ].join(' ')

    log_pids[instance.instance_id] ||= ssh_fork(command, ssh, instance)
  end
end

#stop_app ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 195

def stop_app
  info "stopping old app"
  to_stop = old_instances

  info "starting with #{to_stop.length} instances to stop"

  stop_app_retries.succ.times do |n|
    break if to_stop.empty?
    debug "stop app: #{to_stop.length} instances remaining"
    to_stop.reject! { |instance| stop_one_app(instance) }
  end

  if to_stop.length.zero?
    info "successfully stopped the app on each old instance"
  elsif !continue_if_stop_app_fails
    raise "Failed to stop app on #{to_stop.length} instances"
  end
  info "stopped old app"
end

#wait_for_new_instances ⇒ Object 



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# File 'lib/aerosol/runner.rb', line 62

def wait_for_new_instances
  require_deploy!
  info "waiting for new instances"

  live_instances = []
  Timeout.timeout(instance_live_grace_period) do
    loop do
      current_instances = new_instances
      remaining_instances = current_instances - live_instances
      info "waiting for instances to be live (#{remaining_instances.count} remaining)"
      debug "current instances: #{current_instances.map(&:instance_id)}"
      debug "live instances: #{live_instances.map(&:instance_id)}"
      live_instances.concat(remaining_instances.select { |instance| healthy?(instance) })
      break if (current_instances - live_instances).empty?
      debug 'sleeping for 10 seconds'
      sleep(10)
    end
  end

  info 'new instances are up'
rescue Timeout::Error
  raise "[aerosol runner] site live check timed out after #{instance_live_grace_period} seconds"
ensure
  log_pids.each do |instance_id, fork|
    debug "Killing tailing for #{instance_id}: #{Time.now}"
    Process.kill('HUP', fork)
    debug "Killed process for #{instance_id}: #{Time.now}"
    debug "Waiting for process to die"
    Process.wait(fork)
    debug "Process ended for #{instance_id}: #{Time.now}"
  end
end

#with_deploy(name) {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/aerosol/runner.rb', line 261

def with_deploy(name)
  unless dep = Aerosol::Deploy[name]
    raise "No deploy named '#{name}'"
  end
  original = @deploy
  @deploy = dep
  yield self
  @deploy = original
end