Class: EM::Beanstalk

Inherits:
Object
  • Object
show all
Defined in:
lib/em-beanstalk.rb,
lib/em-beanstalk/job.rb,
lib/em-beanstalk/shell.rb,
lib/em-beanstalk/connection.rb

Defined Under Namespace

Modules: VERSION Classes: Body, Connection, Job, Shell

Constant Summary collapse

Disconnected = 
Class.new(RuntimeError)
InvalidCommand = 
Class.new(RuntimeError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = nil) ⇒ Beanstalk

Returns a new instance of Beanstalk.



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# File 'lib/em-beanstalk.rb', line 25

def initialize(opts = nil)
  @host                   = opts && opts[:host] || 'localhost'
  @port                   = opts && opts[:port] || 11300
  @tube                   = opts && opts[:tube] || 'default'
  @retry_count            = opts && opts[:retry_count] || 5
  @default_priority       = opts && opts[:default_priority] || 65536
  @default_delay          = opts && opts[:default_delay] || 0
  @default_ttr            = opts && opts[:default_ttr] || 300
  @default_timeout        = opts && opts[:timeout] || 5
  @default_error_callback = opts && opts[:default_error_callback] || Proc.new{ |error| puts "ERROR: #{error.inspect}" }
  @raise_on_disconnect    = opts && opts.key?(:raise_on_disconnect) ? opts[:raise_on_disconnect] : true
  
  @watched_tubes          = []

  @data = ""
  @retries = 0
  @in_reserve = false
  @deferrables = []

  @conn = EM::connect(host, port, EM::Beanstalk::Connection) do |conn|
    conn.client = self
    conn.comm_inactivity_timeout = 0
    conn.pending_connect_timeout = @default_timeout
  end

  if @tube
    use(@tube)
    watch(@tube)
  end
end

Instance Attribute Details

#default_delay ⇒ Object (readonly)

Returns the value of attribute default_delay.



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# File 'lib/em-beanstalk.rb', line 23

def default_delay
  @default_delay
end

#default_error_callback ⇒ Object (readonly)

Returns the value of attribute default_error_callback.



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# File 'lib/em-beanstalk.rb', line 23

def default_error_callback
  @default_error_callback
end

#default_priority ⇒ Object (readonly)

Returns the value of attribute default_priority.



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# File 'lib/em-beanstalk.rb', line 23

def default_priority
  @default_priority
end

#default_ttr ⇒ Object (readonly)

Returns the value of attribute default_ttr.



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# File 'lib/em-beanstalk.rb', line 23

def default_ttr
  @default_ttr
end

#host ⇒ Object

Returns the value of attribute host.



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# File 'lib/em-beanstalk.rb', line 22

def host
  @host
end

#port ⇒ Object

Returns the value of attribute port.



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# File 'lib/em-beanstalk.rb', line 22

def port
  @port
end

Instance Method Details

#add_deferrable(&block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 203

def add_deferrable(&block)
  df = Defer.new(default_error_callback, &block)
  @deferrables.push(df)
  df
end

#close ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 56

def close
  @disconnect_manually = true
  @conn.close_connection
end

#connected ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 185

def connected
  @retries = 0
end

#delete(val, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 140

def delete(val, &block)
  return unless val
  @conn.send(:delete, job_id(val))
  add_deferrable(&block)
end

#disconnected ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 189

def disconnected
  @deferrables.each {|d| d.fail(:disconnected) }
  unless @disconnect_manually
    raise EM::Beanstalk::Disconnected if @retries >= @retry_count && @raise_on_disconnect
    @retries += 1
    EM.add_timer(1) { reconnect }
  end
end

#drain!(&block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 61

def drain!(&block)
  stats do |stats|
    stats['current-jobs-ready'].zero? ?
      EM.next_tick(&block) :
      reserve{|job| job.delete{ drain!(&block) }}
  end
end

#each_job(timeout = nil, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 100

def each_job(timeout = nil, &block)
  work = Proc.new do
    r = reserve(timeout)
    r.callback do |job|
      block.call(job)
      EM.next_tick { work.call }
    end
  end
  work.call
end

#extract_body(bytes, data) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 276

def extract_body(bytes, data)
  rem = data[(data.index(/\r\n/) + 2)..-1]
  if rem.length < bytes
    nil
  else
    body = rem[0..(bytes - 1)]
    data = rem[(bytes + 2)..-1]
    data = "" if data.nil?
    Body.new(body, data)
  end
end

#ignore(tube, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 84

def ignore(tube, &block)
  return if not @watched_tubes.include?(tube)
  @watched_tubes.delete(tube)
  @conn.send(:ignore, tube)
  add_deferrable(&block)
end

#job_id(val) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 121

def job_id(val)
  case val
  when Job
    val.id
  else
    val
  end
end

#list(type = nil, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 130

def list(type = nil, &block)
  case(type)
  when :tube, :tubes, nil then  @conn.send(:'list-tubes')
  when :use, :used        then  @conn.send(:'list-tube-used')
  when :watch, :watched   then  @conn.send(:'list-tubes-watched')
  else                          raise EM::Beanstalk::InvalidCommand.new
  end
  add_deferrable(&block)
end

#on_error(&block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 209

def on_error(&block)
  @error_callback = block
end

#peek(id, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 146

def peek(id, &block)
  case id
  when :ready   then  @conn.send(:'peek-ready')
  when :delayed then  @conn.send(:'peek-delayed')
  when :buried  then  @conn.send(:'peek-buried')
  else                @conn.send(:'peek', id)
  end
  add_deferrable(&block)
end

#put(msg, opts = nil, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 156

def put(msg, opts = nil, &block)
  case msg
  when Job
    priority = opts && opts[:priority] || msg.priority
    delay = opts && opts[:delay] || msg.delay
    ttr = opts && opts[:ttr] || msg.ttr
    body = msg.body
  else
    priority = opts && opts[:priority] || default_priority
    delay = opts && opts[:delay] || default_delay
    ttr = opts && opts[:ttr] || default_ttr
    body = msg.to_s
  end

  priority = default_priority if priority < 0
  priority = 2 ** 32 if priority > (2 ** 32)
  delay = default_delay if delay < 0
  ttr = default_ttr if ttr < 0

  @conn.send_with_data(:put, body, priority, delay, ttr, body.size)
  add_deferrable(&block)
end

#received(data) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 213

def received(data)
  @data << data
  
  until @data.empty?
    idx = @data.index(/(.*?)\r\n/)
    break if idx.nil?

    first = $1
  
    case (first)
    when /^DELETED/
      df = @deferrables.shift
      df.succeed
    when /^INSERTED\s+(\d+)/
      df = @deferrables.shift
      df.succeed($1.to_i)
    when /^RELEASED/
      df = @deferrables.shift
      df.succeed
    when /^BURIED\s+(\d+)/
      df = @deferrables.shift
      df.fail(:buried, $1.to_i)
    when /^USING\s+(.*)/
      df = @deferrables.shift
      df.succeed($1)
    when /^WATCHING\s+(\d+)/
      df = @deferrables.shift
      df.succeed($1.to_i)
    when /^OK\s+(\d+)/
      bytes = $1.to_i
      if body = extract_body(bytes, @data)
        @data = body.data
        df = @deferrables.shift
        df.succeed(YAML.load(body.body))
        next
      else
        break
      end
    when /^(RESERVED|FOUND)\s+(\d+)\s+(\d+)/
      id = $2.to_i
      bytes = $3.to_i
      if body = extract_body(bytes, @data)
        @data = body.data
        df = @deferrables.shift
        job = EM::Beanstalk::Job.new(self, id, body.body)
        df.succeed(job)
        next
      else
        break
      end
    # error state
    when /^(OUT_OF_MEMORY|INTERNAL_ERROR|DRAINING|BAD_FORMAT|UNKNOWN_COMMAND|EXPECTED_CRLF|JOB_TOO_BIG|DEADLINE_SOON|TIMED_OUT|NOT_FOUND)/
      puts "... got error, calling df."
      df = @deferrables.shift
      df.fail($1.downcase.to_sym)
      @data = @data[($1.length + 2)..-1]
    else
      break
    end
    @data.slice!(0, first.size + 2)
  end
end

#reconnect ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 198

def reconnect
  @disconnect_manually = false
  @conn.reconnect(host, port)
end

#release(val, opts = nil, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 179

def release(val, opts = nil, &block)
  return if val.nil?
  @conn.send(:release, job_id(val), priority.to_i, delay.to_i)
  add_deferrable(&block)
end

#reserve(timeout = nil, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 91

def reserve(timeout = nil, &block)
  if timeout
    @conn.send(:'reserve-with-timeout', timeout)
  else
    @conn.send(:reserve)
  end
  add_deferrable(&block)
end

#stats(type = nil, val = nil, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 111

def stats(type = nil, val = nil, &block)
  case(type)
  when nil        then @conn.send(:stats)
  when :tube      then @conn.send(:'stats-tube', val)
  when :job       then @conn.send(:'stats-job', job_id(val))
  else                 raise EM::Beanstalk::InvalidCommand.new
  end
  add_deferrable(&block)
end

#use(tube, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 69

def use(tube, &block)
  return if @used_tube == tube
  @used_tube = tube
  @conn.send(:use, tube)
  add_deferrable(&block)

end

#watch(tube, &block) ⇒ Object 



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# File 'lib/em-beanstalk.rb', line 77

def watch(tube, &block)
  return if @watched_tubes.include?(tube)
  @watched_tubes.push(tube)
  @conn.send(:watch, tube)
  add_deferrable(&block)
end