Class: ASIR::Main

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Main

Returns a new instance of Main.



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# File 'lib/asir/main.rb', line 27

def initialize
  self.env = ASIR::Environment.new
  self.progname = File.basename($0)
  self.exit_code = 0
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sel, *args) ⇒ Object 



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# File 'lib/asir/main.rb', line 108

def method_missing sel, *args
  log "method_missing #{sel}" if verbose >= 3
  case sel.to_s
  when /^start_([^_]+)_worker!$/
    _start_worker!
  when /^status_([^_]+)_([^_]+)!$/
    pid = server_pid
    puts "#{log_str} pid #{pid}"
    system("ps -fw -p #{pid}")
  when /^log_([^_]+)_([^_]+)!$/
    puts log_file
  when /^taillog_([^_]+)_([^_]+)!$/
    exec "tail -f #{log_file.inspect}"
  when /^pid_([^_]+)_([^_]+)!$/
    pid = server_pid rescue nil
    alive = process_running? pid
    puts "#{pid_file} #{pid || :NA} #{alive}"
  when /^alive_([^_]+)_([^_]+)!$/
    pid = server_pid rescue nil
    alive = process_running? pid
    puts "#{pid_file} #{pid || :NA} #{alive}" if @verbose
    self.exit_code += 1 unless alive
  when /^stop_([^_]+)_([^_]+)!$/
    kill_server!
  else
    super
  end
end

Instance Attribute Details

#args ⇒ Object

Returns the value of attribute args.



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# File 'lib/asir/main.rb', line 7

def args
  @args
end

#env ⇒ Object

Returns the value of attribute env.



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# File 'lib/asir/main.rb', line 7

def env
  @env
end

#exit_code ⇒ Object

Returns the value of attribute exit_code.



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# File 'lib/asir/main.rb', line 7

def exit_code
  @exit_code
end

#force ⇒ Object

Options:



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# File 'lib/asir/main.rb', line 22

def force
  @force
end

#progname ⇒ Object

Returns the value of attribute progname.



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# File 'lib/asir/main.rb', line 20

def progname
  @progname
end

#transport ⇒ Object

Transport selected from asir.phase = :transport.



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# File 'lib/asir/main.rb', line 25

def transport
  @transport
end

Instance Method Details

#_create_transport(default_class) ⇒ Object 



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# File 'lib/asir/main.rb', line 288

def _create_transport default_class
  config!(:environment)
  case transport = config!(:transport)
  when default_class
    self.transport = transport
  else
    raise "Expected config to return a #{default_class}, not a #{transport.class}"
  end
end

#_run_transport_server!(wid = 0) ⇒ Object 



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# File 'lib/asir/main.rb', line 324

def _run_transport_server! wid = 0
  log "running transport worker #{transport.class} #{wid}"
  config!(:start)
  $0 += " #{wid} #{transport.uri rescue nil}"
  old_arg0 = $0.dup
  after_receive_message = transport.after_receive_message || lambda { | transport, message | nil }
  transport.after_receive_message = lambda do | transport, message |
    $0 = "#{old_arg0} #{transport.message_count} #{message.identifier}"
    after_receive_message.call(transport, message)
  end
  transport.run_server!
  self
end

#_run_verb! ⇒ Object 



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# File 'lib/asir/main.rb', line 92

def _run_verb!
  sel = :"#{verb}_#{adjective}_#{object}!"
  if verbose >= 3
    $stderr.puts "  verb      = #{verb.inspect}"
    $stderr.puts "  adjective = #{adjective.inspect}"
    $stderr.puts "  object    = #{object.inspect}"
    $stderr.puts "  sel       = #{sel.inspect}"
  end
  send(sel)
rescue ::Exception => exc
  $stderr.puts "#{log_str} ERROR\n#{exc.inspect}\n  #{exc.backtrace * "\n  "}"
  self.exit_code += 1
  raise
  nil
end

#_run_workers! ⇒ Object 



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# File 'lib/asir/main.rb', line 302

def _run_workers!
  $0 = "#{progname} #{adjective} #{object} #{identifier}"

  worker_id = 0
  transport.prepare_server!
  worker_processes = transport[:worker_processes] || 1
  (worker_processes - 1).times do
    wid = worker_id += 1
    pid = Process.fork do
      _run_transport_server! wid
    end
    Process.setgprp(pid, 0) rescue nil
    worker_pids[wid] = pid
    log "forked #{wid} pid #{pid}"
  end

  _run_transport_server!
ensure
  log "worker 0 stopped"
  _stop_workers!
end

#_start_conduit! ⇒ Object 



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# File 'lib/asir/main.rb', line 192

def _start_conduit!
  config!(:environment)
  self.transport = config!(:transport)
  fork_server! do
    transport.start_conduit! :fork => false
  end
end

#_start_worker!(type = adjective) ⇒ Object 



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# File 'lib/asir/main.rb', line 200

def _start_worker! type = adjective
  log "start_worker! #{type}"
  type = type.to_s
  config!(:environment)
  self.transport = config!(:transport)

  # Get the expected transport class.
  transport_file = "asir/transport/#{type}"
  log "loading #{transport_file}"
  require transport_file
  transport_class = ASIR::Transport.const_get(type[0..0].upcase + type[1..-1])

  fork_server! do
    _create_transport transport_class
    _run_workers!
  end
end

#_stop_workers! ⇒ Object 



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# File 'lib/asir/main.rb', line 338

def _stop_workers!
  workers = worker_pids.dup
  worker_pids.clear
  workers.each do | wid, pid |
    config!(:stop)
    stop_pid! pid, "wid #{wid} "
  end
  workers.each do | wid, pid |
    wr = Process.waitpid(pid) rescue nil
    log "stopped #{wid} pid #{pid} => #{wr.inspect}", :stderr
  end
ensure
  worker_pids.clear
end

#config!(*args) ⇒ Object 



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# File 'lib/asir/main.rb', line 54

def config! *args
  @env.config! *args
end

#fork_server!(cmd = nil, &blk) ⇒ Object 



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# File 'lib/asir/main.rb', line 218

def fork_server! cmd = nil, &blk
  pid = Process.fork do
    run_server! cmd, &blk
  end
  log "forked pid #{pid}"
  Process.detach(pid) # Forks a Thread?  We are gonna exit anyway.
  File.open(pid_file, "w+") { | o | o.puts pid }
  File.chmod(0666, pid_file) rescue nil

  # Wait and check if process still exists.
  sleep 3
  unless process_running? pid
    raise "Server process #{pid} died to soon?"
  end

  self
end

#kill_server! ⇒ Object 



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# File 'lib/asir/main.rb', line 265

def kill_server!
  log "#{log_str} kill"
  pid = server_pid
  stop_pid! pid
rescue ::Exception => exc
  log "#{log_str} ERROR\n#{exc.inspect}\n  #{exc.backtrace * "\n  "}", :stderr
  raise
end

#log(msg, to_stderr = false) ⇒ Object 



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# File 'lib/asir/main.rb', line 274

def log msg, to_stderr = false
  if to_stderr
    $stderr.puts "#{log_str_no_time} #{msg}"
  end
  File.open(log_file, "a+") do | log |
    log.puts "#{log_str} #{msg}"
  end
end

#log_str ⇒ Object 



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# File 'lib/asir/main.rb', line 58

def log_str
  "#{Time.now.gmtime.iso8601(4)} #{$$} #{log_str_no_time}"
end

#log_str_no_time ⇒ Object 



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# File 'lib/asir/main.rb', line 62

def log_str_no_time
  "#{progname} #{verb} #{adjective} #{object} #{identifier}"
end

#parse_args!(args = ARGV.dup) ⇒ Object 



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# File 'lib/asir/main.rb', line 33

def parse_args! args = ARGV.dup
  self.args = args
  until args.empty?
    case args.first
    when /^--?h(elp)/
      @help = true
      return self
    when /^([a-z0-9_]+=)(.*)/i
      k, v = $1.to_sym, $2
      args.shift
      v = v.to_i if v == v.to_i.to_s
      send(k, v)
    else
      break
    end
  end
  self.verb, self.adjective, self.object, self.identifier = args.map{|x| x.to_sym}
  self.identifier ||= :'0'
  self
end

#process_running?(pid) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asir/main.rb', line 371

def process_running? pid
  case pid
  when false, nil
    pid
  when Integer
    Process.kill(0, pid)
  else
    raise TypeError, "expected false, nil, Integer; given #{pid.inspect}"
  end
  true
rescue ::Errno::ESRCH
  false
rescue ::Exception => exc
  $stderr.puts "  DEBUG: process_running? #{pid} => #{exc.inspect}"
  false
end

#run! ⇒ Object 



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# File 'lib/asir/main.rb', line 66

def run!
  if @help
    return usage!
  end
  unless verb && adjective && object
    self.exit_code = 1
    return usage!
  end
  config!(:configure)
  # $stderr.puts "log_file = #{log_file.inspect}"
  case self.verb
  when :restart
    self.verb = :stop
    _run_verb! && sleep(1)
    self.verb = :start
    _run_verb!
  else
    _run_verb!
  end
  self
rescue ::Exception => exc
  $stderr.puts "#{log_str} ERROR\n#{exc.inspect}\n  #{exc.backtrace * "\n  "}"
  self.exit_code += 1
  self
end

#run_server!(cmd = nil) ⇒ Object 



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# File 'lib/asir/main.rb', line 236

def run_server! cmd = nil
  lf = File.open(log_file, "a+")
  File.chmod(0666, log_file) rescue nil
  $stdin.close rescue nil
  STDIN.close rescue nil
  STDOUT.reopen(lf)
  $stdout.reopen(lf) if $stdout.object_id != STDOUT.object_id
  STDERR.reopen(lf)
  $stderr.reopen(lf) if $stderr.object_id != STDERR.object_id
  # Process.daemon rescue nil # Ruby 1.9.x only.
  lf.puts "#{log_str} starting pid #{$$}"
  begin
    if cmd
      exec(cmd)
    else
      yield
    end
  ensure
    lf.puts "#{log_str} finished pid #{$$}"
    File.unlink(pid_file) rescue nil
  end
  self
rescue ::Exception => exc
  msg = "ERROR pid #{$$}\n#{exc.inspect}\n  #{exc.backtrace * "\n  "}"
  log msg, :stderr
  raise
  self
end

#server_pid ⇒ Object 



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# File 'lib/asir/main.rb', line 283

def server_pid
  pid = File.read(pid_file).chomp!
  pid.to_i
end

#start_beanstalk_conduit! ⇒ Object 



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# File 'lib/asir/main.rb', line 184

def start_beanstalk_conduit!
  _start_conduit!
end

#start_resque_conduit! ⇒ Object 



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# File 'lib/asir/main.rb', line 188

def start_resque_conduit!
  _start_conduit!
end

#stop_pid!(pid, msg = nil) ⇒ Object 



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# File 'lib/asir/main.rb', line 353

def stop_pid! pid, msg = nil
  log "stopping #{msg}pid #{pid}", :stderr
  if process_running? pid
    log "TERM pid #{pid}"
    Process.kill('TERM', pid) rescue nil
    sleep 3
    if force or process_running? pid
      log "KILL pid #{pid}", :stderr
      Process.kill('KILL', pid) rescue nil
    end
    if process_running? pid
      log "cant-stop pid #{pid}", :stderr
    end
  else
    log "not-running? pid #{pid}", :stderr
  end
end

#usage! ⇒ Object 



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# File 'lib/asir/main.rb', line 137

def usage!
  $stderr.puts <<"END"
SYNOPSIS:
asir [ <<options>> ... ] <<verb>> <<adjective>> <<object>> [ <<identifier>> ]

OPTIONS:
config_rb=file.rb ($ASIR_LOG_DIR)
pid_dir=dir/      ($ASIR_PID_DIR)
log_dir=dir/      ($ASIR_LOG_DIR)
verbose=[0-9]

VERBS:
start
stop
restart
status
log
pid
alive

ADJECTIVE-OBJECTs:
beanstalk conduit
beanstalk worker
zmq worker
webrick worker
resque conduit
resque worker

EXAMPLES:

export ASIR_CONFIG_RB="some_system/asir_config.rb"
asir start beanstalk conduit
asir status beanstalk conduit

asir start webrick worker
asir pid   webrick worker

asir start beanstalk worker 1
asir start beanstalk worker 2

asir start zmq worker
asir start zmq worker 1
asir start zmq worker 2
END
  self
end

#worker_pids ⇒ Object 



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# File 'lib/asir/main.rb', line 298

def worker_pids
  (@worker_pids ||= { })[adjective] ||= { }
end