Class: Pastry

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

Defined Under Namespace

Modules: PastryServer Classes: Backend

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pool, app, options = {}) ⇒ Pastry

Returns a new instance of Pastry.



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# File 'lib/pastry.rb', line 9

def initialize pool, app, options = {}
  @pool    = pool
  @app     = app
  @host    = options.fetch :host,       '127.0.0.1'
  @unix    = options.fetch :socket,     nil
  @logfile = options.fetch :logfile,    nil
  @daemon  = options.fetch :daemonize,  false
  @pidfile = options.fetch :pidfile,    '/tmp/pastry.pid'
  @name    = options.fetch :name,       nil

  @port    = options.fetch(:port,    3000).to_i
  @queue   = options.fetch(:queue,   1024).to_i
  @maxconn = options.fetch(:maxconn, 1024).to_i
  @timeout = options.fetch(:timeout,   30).to_i
end

Instance Attribute Details

#daemon ⇒ Object (readonly)

Returns the value of attribute daemon.



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# File 'lib/pastry.rb', line 7

def daemon
  @daemon
end

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/pastry.rb', line 7

def host
  @host
end

#logfile ⇒ Object (readonly)

Returns the value of attribute logfile.



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# File 'lib/pastry.rb', line 7

def logfile
  @logfile
end

#pidfile ⇒ Object (readonly)

Returns the value of attribute pidfile.



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# File 'lib/pastry.rb', line 7

def pidfile
  @pidfile
end

#pool ⇒ Object (readonly)

Returns the value of attribute pool.



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# File 'lib/pastry.rb', line 7

def pool
  @pool
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/pastry.rb', line 7

def port
  @port
end

#unix ⇒ Object (readonly)

Returns the value of attribute unix.



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# File 'lib/pastry.rb', line 7

def unix
  @unix
end

Instance Method Details

#create_pidfile ⇒ Object 



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# File 'lib/pastry.rb', line 47

def create_pidfile
  File.open(pidfile, 'w') {|fh| fh.write(Process.pid)}
end

#ensure_not_running! ⇒ Object 



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# File 'lib/pastry.rb', line 39

def ensure_not_running!
  if File.exists?(pidfile) && pid = File.read(pidfile).to_i
    running = Process.kill(0, pid) rescue nil
    raise "already running with pid #{pid}" if running
    FileUtils.rm_f(pidfile)
  end
end

#motd ⇒ Object 



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# File 'lib/pastry.rb', line 55

def motd
  "starting #{name} with #{pool} minions listening on #{unix ? 'socket %s ' % unix : 'port %d' % port}"
end

#name ⇒ Object 



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# File 'lib/pastry.rb', line 51

def name
  '%s master' % (@name || 'pastry')
end

#run(server, options, worker) ⇒ Object 



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# File 'lib/pastry.rb', line 103

def run server, options, worker
  fork do
    $0 = "#{@name ? "%s worker" % @name : "pastry chef"} #{worker} (started: #{Time.now})"
    EM.run { Backend.new(options).start(server) }
  end
end

#start ⇒ Object 



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# File 'lib/pastry.rb', line 25

def start
  ensure_not_running!
  Process.daemon if daemon

  if daemon || logfile
    STDOUT.reopen(logfile || '/tmp/pastry.log', 'a')
    STDERR.reopen(logfile || '/tmp/pastry.log', 'a')
    STDOUT.sync = true
    STDERR.sync = true
  end

  start!
end

#start! ⇒ Object 



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# File 'lib/pastry.rb', line 59

def start!
  create_pidfile
  server = unix ? UNIXServer.new(unix) : TCPServer.new(host, port)

  server.setsockopt(Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true) unless unix
  server.fcntl(Fcntl::F_SETFL, server.fcntl(Fcntl::F_GETFL) | Fcntl::O_NONBLOCK)

  server.listen(@queue)
  server.extend(PastryServer)

  server.app = @app
  logger     = Logger.new(logfile || (daemon ? '/tmp/pastry.log' : $stdout), 0)
  options    = {timeout: @timeout, maximum_connections: @maxconn}

  logger.info motd

  $0         = name if @name
  @running   = true
  pids       = pool.times.map {|n| run(server, options, n) }

  Signal.trap('CHLD') do
    if @running
      died  = pids.reject {|pid| Process.kill(0, pid) rescue nil}
      died.each do |pid|
        logger.info "process #{pid} died, starting a new one"
        idx       = pids.index(pid)
        pids[idx] = run(server, options, idx)
      end
    end
  end

  %w(INT TERM HUP).each do |signal|
    Signal.trap(signal) do
      @running = false
      logger.info "caught #{signal}, closing time for the bakery -- no more pastries!"
      pids.each {|pid| Process.kill(signal, pid) rescue nil}
      exit
    end
  end

  at_exit { FileUtils.rm_f(pidfile); FileUtils.rm_f(unix.to_s) }
  Process.waitall rescue nil
end