Class: Orchestrator::Task

Inherits:
Object
  • Object
show all
Defined in:
lib/orchestrator/task.rb

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Task

Returns a new instance of Task.



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# File 'lib/orchestrator/task.rb', line 12

def initialize(options)
  @mutex = Mutex.new
  Thread.abort_on_exception = true
  @log = ''

  @children = {}

  @options = options

  @defaults = {}
  @defaults[:envs] = Object.new
  @defaults[:args] = Object.new

  invalid("config file #{config} does not exists") unless File.exist?(@options.config)

  @settings = YAML.load_file(@options.config)
  invalid("no task job #{@options.name} is defined in settings file") unless @settings['orchestrator'].has_key?(@options.name)

  invalid("no statedir is defined in settings file") if @settings['orchestrator'][@options.name]['save'] && !@settings['orchestrator'].has_key?('statedir')
  unless @options.statefile
    if @settings['orchestrator'][@options.name]['save']
      @options.statefile = @settings['orchestrator']['statedir'] + "/" + @options.name
      FileUtils.mkdir_p(@settings['orchestrator']['statedir'])
    end
  end

  if @options.statefile
    if File.exist?(@options.statefile)
      File.open(@options.statefile, "r") do |file|
        @got_lock = file.flock( File::LOCK_NB | File::LOCK_EX )
      end
      unless @got_lock
        if @options.kill
          @state = YAML.load_file(@options.statefile)
          begin
            Process.kill("TERM", @state['pid']) if @state.has_key?('pid')
          rescue Errno::ESRCH
          end
          sleep 0.1
          File.open(@options.statefile, "r") do |file|
            @got_lock = file.flock( File::LOCK_NB | File::LOCK_EX )
          end
        end
        invalid("The state file #{@options.statefile} is already locked by other process") unless @got_lock
      end
    end

    @state = (File.exist?(@options.statefile) && !@options.reset) ? YAML.load_file(@options.statefile) : @settings['orchestrator'][@options.name]

    @state['pid'] = Process.pid

    @statefile_handle = File.open(@options.statefile, "w")
    @statefile_handle.flock( File::LOCK_NB | File::LOCK_EX )
    @statefile_handle.sync = true
    ### @statefile_handle.close_on_exec = true
    Signal.trap("TERM") do
      @children.each do |pid, command|
        begin
          Process.kill("TERM", pid)
          puts "KILLED #{pid}: #{command}\n" if @options.verbose
          @log += "KILLED #{pid}: #{command}\n"
        rescue Errno::ESRCH
        end
      end
      puts "KILLED ORCHESTRATOR\n" if @options.verbose
      @log += "KILLED ORCHESTRATOR\n"
      fail
    end
  else
    @state = @settings['orchestrator'][@options.name]
  end

  @options.email = false unless @state.has_key?('email')
  @options.email_on_success = (@options.email and @state['email'].has_key?('on_success')) ? @state['email']['on_success'] : true

  @options.sms = false unless @state.has_key?('sms')
  @options.sms_on_success = (@options.sms and @state['sms'].has_key?('on_success')) ? @state['sms']['on_success'] : false
end

Instance Method Details

#fail ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 201

def fail
  run_script(@failure_handler) if @failure_handler
  run_script(@state['failure_handler']) if @state.has_key?('failure_handler')

  Pony.mail(
    :to => @state['email']['recipients'],
    :from => @state['email']['from'],
    :subject => "#{@state['description']} - [FAILED]",
    :body => @log
  ) if @options.email

  Pony.mail(
    :to => @state['sms']['recipients'],
    :from => @state['sms']['from'],
    :subject => "#{@state['description']} - [FAILED]",
   :body => @state['sms']['auth']
  ) if @options.sms

  exit 1
end

#interpolate_command(command, pattern = /^(ENV|ARG|EXEC)\./) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 111

def interpolate_command(command,pattern=/^(ENV|ARG|EXEC)\./)
  command.gsub(/:::([^:]*):::/) do
    match = $1
    invalid("interpolation type is not valid in this context - :::#{match}:::") if match !~ pattern and match =~ /^(ENV|ARG|EXEC)\./

    case match
    when /^ENV\./
      env = match["ENV.".length..-1]
      invalid("command interpolation failed no such env variable - #{env}") if !ENV[env] and !@defaults[:envs].instance_variable_defined?("@#{env}")
      ENV[env] ? ENV[env] : @defaults[:envs].instance_variable_get("@#{env}")
    when /^ARG\./
      arg = match["ARG.".length..-1]
      invalid("command interpolation failed no such arg - #{arg}") if !@options.args.instance_variable_defined?("@#{arg}") and !@defaults[:args].instance_variable_defined?("@#{arg}")
      @options.args.instance_variable_defined?("@#{arg}") ? @options.args.instance_variable_get("@#{arg}") : @defaults[:args].instance_variable_get("@#{arg}")
    when /^EXEC\./
      exec = match["EXEC.".length..-1]
      result = nil
      begin
        result = IO.popen(exec)
      rescue
        invalid("command interpolation failed to exec - #{exec}")
      end
      invalid("command interpolation exec exit with non zero status - #{exec}") unless $?.to_i == 0
      result.readline.delete("\n")
    else
      invalid("command interpolation failed not valid parameter - :::#{match}:::")
    end
  end
end

#invalid(reason) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 91

def invalid(reason)
  Formatador.display_line("[red]ERROR[/]: #{reason}")
  exit 1
end

#notify ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 222

def notify
  Pony.mail(
    :to => @state['email']['recipients'],
    :from => @state['email']['from'],
    :subject => "#{@state['description']} - [OK]",
    :body => @log
  ) if @options.email and @options.email_on_success

  Pony.mail(
    :to => @state['sms']['recipients'],
    :from => @state['sms']['from'],
    :subject => "#{@state['description']} - [OK]",
    :body => @state['sms']['auth']
  ) if @options.sms and @options.sms_on_success
end

#run ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 349

def run
  validate_config
  save_state

  @state['steps'].each do |step|
    @statuses = Array.new

    @timeout = step.has_key?('timeout') ? step['timeout'].to_i : 0
    @retries = step.has_key?('retries') ? step['retries'].to_i : 0
    @retry_delay = step.has_key?('retry_delay') ? step['retry_delay'] : 0
    @on_week_days = step.has_key?('on_week_days') ? step['on_week_days'].map{|d| "#{d}?".downcase.to_sym} : [ :sunday?, :monday?, :tuesday?, :wednesday?, :thursday?, :friday?, :saturday? ]
    @on_month_days = step.has_key?('on_month_days') ? step['on_month_days'] : (1..31).to_a
    @failure_handler = step.has_key?('failure_handler') ? step['failure_handler'] : nil

    if step['type'].to_sym == :parallel and @on_week_days.map {|d| Time.now.send(d) }.find_index(true) and @on_month_days.find_index(Time.now.mday)
      #Parallel
      interval = step.has_key?('sleep') ? step['sleep'] : 1
      parallel_factor = step.has_key?('parallel') ? step['parallel'] : 1
      @on_failure = step.has_key?('on_failure') ? step['on_failure'].to_sym : :finish

      @threads = Hash.new
      index = 0
      running_threads = 0

      step['scripts'].each_index do |index|
        next if step['scripts'][index].has_key?('status') and step['scripts'][index]['status'] == 'OK'
        loop do
          @mutex.synchronize do
            running_threads = @threads.length
          end
          break if @on_failure == :wait and @statuses.find_index(false)
          if parallel_factor > running_threads
            @threads[index] = Thread.new { thread_wrapper(index, step['scripts'][index]) }
            break
          end
          sleep interval
        end
      end
      loop do
        @mutex.synchronize do
          running_threads = @threads.length
        end
        break if running_threads == 0
        sleep interval
      end
      fail if @on_failure != :ignore and @statuses.find_index(false)

    elsif step['type'].to_sym == :sequential and @on_week_days.map {|d| Time.now.send(d) }.find_index(true) and @on_month_days.find_index(Time.now.mday)
      #Sequential
      @on_failure = step.has_key?('on_failure') ? step['on_failure'].to_sym : :die

      step['scripts'].each_index do |index|
        failures = 0
        next if step['scripts'][index].has_key?('status') and step['scripts'][index]['status'] == 'OK'
        loop do
          @statuses[index] = run_script(step['scripts'][index])
          break if @statuses[index]
          failures += 1
          break if failures > @retries
          sleep @retry_delay
        end
        run_post_script_handlers(step['scripts'][index],@statuses[index])
        fail if not @statuses[index] and @on_failure == :die
      end
      fail if @on_failure != :ignore and @statuses.find_index(false)
    end
  end

  FileUtils.rm_f(@options.statefile) if @options.statefile
  notify
end

#run_command(command, timeout) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 238

def run_command(command,timeout)
  result = ""
  error = ""

  #  start = Time.now
  
  status = 'STARTED'
  child = nil
  begin
    Timeout::timeout(timeout) do
      status = POpen4::popen4(command) do |stdout, stderr, stdin, pid|
        @children[pid] = command
        child = pid
        result = stdout.read.strip
        error = stderr.read.strip
      end
      status = (status.nil? or status.exitstatus != 0) ? 'FAILED' : 'OK'
    end
  rescue Timeout::Error
    status = 'TIMEOUT'
    if child
      begin
        Process.kill("TERM", child)
        result += "\nKILLED #{child}: #{command}\n"
      rescue Errno::ESRCH
      end
    end
  end

  #  runtime = Time.now - start
  #  runtime = runtime > 60 ? runtime/60 : runtime

  @mutex.synchronize do
    @children.delete(child) if child

    output = <<-EOF

Running: #{command} - #{status}
============ STDOUT ============
#{result}
============ STDERR ============
#{error}
================================
EOF

    @log += output
    puts output if @options.verbose
  end

  return status
end

#run_post_script_handlers(script, status) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 290

def run_post_script_handlers(script,status)
  handler = nil
  if status
    handler = 'ok_handler' if script.has_key?('ok_handler')
  else
    handler = 'failure_handler' if script.has_key?('failure_handler')
  end
  if handler
    timeout = script.has_key?('timeout') ? script['timeout'].to_i : @timeout
    run_command(script[handler],timeout)
  end
end

#run_script(script) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 303

def run_script(script)
  timeout = script.has_key?('timeout') ? script['timeout'].to_i : @timeout

  script['status'] = 'STARTED'
  save_state
  script['status'] = run_command(script['command'],timeout)
  save_state

  return script['status'] == 'OK'
end

#save_state ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 96

def save_state
  if @options.statefile
    @mutex.synchronize do
      unless File.exist?(@options.statefile)
        @statefile_handle.close
        @statefile_handle = File.open(@options.statefile, "w")
        @statefile_handle.flock( File::LOCK_NB | File::LOCK_EX )
        @statefile_handle.sync = true
      end
      @statefile_handle.rewind
      YAML.dump(@state, @statefile_handle)
    end
  end
end

#thread_wrapper(i, script) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 314

def thread_wrapper(i,script)
  failures = 0

  loop do
    begin
      @statuses[i] = run_script(script)
    rescue Exception => e
      script['status'] = 'EXCEPTION'
      save_state
      @statuses[i] = false
      @mutex.synchronize do
        output = <<-EOF

Thread - (#{script['command']})
Died due to following exception:
#{e.inspect}
#{e.backtrace}
EOF
        @log += output
        puts output if @options.verbose
      end
    end

    break if @statuses[i]

    failures += 1
    break if @retries < failures
    sleep @retry_delay
  end

  @threads.delete(i)
  run_post_script_handlers(script,@statuses[i])
  fail if @on_failure == :die and not @statuses[i]
end

#validate_command(command, error_prefix) ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 141

def validate_command(command,error_prefix)
  if command.is_a?(String)
     command = { 'command' => interpolate_command(command) }
  elsif command.is_a?(Hash)
    invalid(error_prefix + " is missing command attribute") unless command.has_key?('command')
    ['command', 'ok_handler', 'failure_handler'].each do |attribute|
      if command.has_key?(attribute)
        invalid(error_prefix + " #{attribute} attribute is invalid") unless command[attribute].is_a?(String)
        command[attribute] = interpolate_command(command[attribute])
      end
    end
  else
    invalid(error_prefix + " has invalid format")
  end
  command
end

#validate_config ⇒ Object 



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# File 'lib/orchestrator/task.rb', line 158

def validate_config
  @state['failure_handler'] = validate_command(@state['failure_handler'], 'task failure handler') if @state.has_key?('failure_handler')
  if @state.has_key?('email')
    invalid("config email recipients is missing or invalid") unless @state['email'].has_key?('recipients') && @state['email']['recipients'].is_a?(String) || @state['email']['recipients'].is_a?(Array)
    invalid("config email from is missing or invalid") unless @state['email'].has_key?('from') && @state['email']['from'].is_a?(String)
    @state['email']['from'] = interpolate_command(@state['email']['from'])
  end
  if @state.has_key?('sms')
    invalid("task sms recipients is missing") unless @state['sms'].has_key?('recipients') && @state['sms']['recipients'].is_a?(String) || @state['sms']['recipients'].is_a?(Array)
    invalid("task sms from is missing") unless @state['sms'].has_key?('from') && @state['sms']['from'].is_a?(String)
    @state['sms']['from'] = interpolate_command(@state['sms']['from'])
  end
  if @state.has_key?('defaults')
    invalid("defaults must be hash") unless @state['defaults'].is_a?(Hash)
    [:envs, :args].each do |type|
      if @state['defaults'].has_key?(type.to_s)
        invalid("default envs must be hash") unless @state['defaults'][type.to_s].is_a?(Hash)
        @state['defaults'][type.to_s].each do|key,value|
          value = '' unless value
          invalid("default value for #{type} #{key} is invalid") unless value.is_a?(String)
          @defaults[type].instance_variable_set("@#{key}",interpolate_command(value,/^EXEC\./))
        end
      end
    end
  end
  invalid("task description is missing or invalid") unless @state.has_key?('description') && @state['description'].is_a?(String)
  @state['description'] = interpolate_command(@state['description'])
  invalid("task save must be boolean") if @state.has_key?('save') && !!@state['save'] != @state['save']
  @state['save'] = false unless @state.has_key?('save')
  invalid("task steps is missing") unless @state.has_key?('steps')
  invalid("task steps must be array") unless @state['steps'].is_a?(Array)
  @state['steps'].each do |step|
    invalid("task step is not hash") unless step.is_a?(Hash)
    invalid("task step has no type") unless step.has_key?('type') && step['type'].is_a?(String)
    invalid("task step type #{step['type']} is invalid") unless [:parallel,:sequential].find_index(step['type'].to_sym)
    invalid("task step scripts is missing or invalid") unless step.has_key?('scripts') && step['scripts'].is_a?(Array)
    step['failure_handler'] = validate_command(step['failure_handler'], 'task failure handler') if step.has_key?('failure_handler')
    step['scripts'].each_index do |index|
      step['scripts'][index] = validate_command(step['scripts'][index], 'task step script')
    end
  end
end