Class: Thin::Controllers::Cluster

Inherits:
Controller show all
Defined in:
lib/thin/controllers/cluster.rb

Overview

Control a set of servers.

  • Generate start and stop commands and run them.

  • Inject the port or socket number in the pid and log filenames.

Servers are started throught the thin command-line script.

Constant Summary collapse

CLUSTER_OPTIONS =

Cluster only options that should not be passed in the command sent to the indiviual servers.

[:servers, :only, :onebyone, :wait]
DEFAULT_WAIT_TIME =

Maximum wait time for the server to be restarted

30

Instance Attribute Summary

Attributes inherited from Controller

#options

Instance Method Summary collapse

Methods inherited from Controller

#config

Methods included from Logging

debug=, debug?, level, level=, #log, log_debug, #log_debug, log_error, #log_error, #log_info, log_info, log_msg, #silent, #silent=, silent=, silent?, #trace, trace, trace=, trace?, trace_msg

Constructor Details

#initialize(options) ⇒ Cluster

Create a new cluster of servers launched using options.



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# File 'lib/thin/controllers/cluster.rb', line 21

def initialize(options)
  super
  # Cluster can only contain daemonized servers
  @options.merge!(:daemonize => true)
end

Instance Method Details

#address ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 28

def address;    @options[:address]  end

#first_port ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 27

def first_port; @options[:port]     end

#log_file ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 31

def log_file;   @options[:log]      end

#log_file_for(number) ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 123

def log_file_for(number)
  include_server_number log_file, number
end

#onebyone ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 34

def onebyone;   @options[:onebyone] end

#only ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 33

def only;       @options[:only]     end

#pid_file ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 30

def pid_file;   @options[:pid]      end

#pid_file_for(number) ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 127

def pid_file_for(number)
  include_server_number pid_file, number
end

#pid_for(number) ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 135

def pid_for(number)
  File.read(pid_file_for(number)).chomp.to_i
end

#restart ⇒ Object

Stop and start the servers.



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# File 'lib/thin/controllers/cluster.rb', line 66

def restart
  unless onebyone
    # Let's do a normal restart by defaults
    stop
    sleep 0.1 # Let's breath a bit shall we ?
    start
  else
    with_each_server do |n| 
      stop_server(n)
      sleep 0.1 # Let's breath a bit shall we ?
      start_server(n)
      wait_until_server_started(n)
    end
  end
end

#server_id(number) ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 113

def server_id(number)
  if socket
    socket_for(number)
  elsif swiftiply?
    [address, first_port, number].join(':')
  else
    [address, number].join(':')
  end
end

#size ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 32

def size;       @options[:servers]  end

#socket ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 29

def socket;     @options[:socket]   end

#socket_for(number) ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 131

def socket_for(number)
  include_server_number socket, number
end

#start ⇒ Object

Start the servers



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# File 'lib/thin/controllers/cluster.rb', line 42

def start
  with_each_server { |n| start_server n }
end

#start_server(number) ⇒ Object

Start a single server



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# File 'lib/thin/controllers/cluster.rb', line 47

def start_server(number)
  log_info "Starting server on #{server_id(number)} ... "

  run :start, number
end

#stop ⇒ Object

Stop the servers



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# File 'lib/thin/controllers/cluster.rb', line 54

def stop
  with_each_server { |n| stop_server n }
end

#stop_server(number) ⇒ Object

Stop a single server



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# File 'lib/thin/controllers/cluster.rb', line 59

def stop_server(number)
  log_info "Stopping server on #{server_id(number)} ... "

  run :stop, number
end

#swiftiply? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/thin/controllers/cluster.rb', line 37

def swiftiply?
  @options.has_key?(:swiftiply)
end

#test_socket(number) ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 82

def test_socket(number)
  if socket
    UNIXSocket.new(socket_for(number))
  else
    TCPSocket.new(address, number)
  end
rescue
  nil
end

#wait ⇒ Object 



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# File 'lib/thin/controllers/cluster.rb', line 35

def wait;       @options[:wait]     end

#wait_until_server_started(number) ⇒ Object

Make sure the server is running before moving on to the next one.



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# File 'lib/thin/controllers/cluster.rb', line 93

def wait_until_server_started(number)
  log_info "Waiting for server to start ..."
  STDOUT.flush # Need this to make sure user got the message
  
  tries = 0
  loop do
    if test_socket = test_socket(number)
      test_socket.close
      break
    elsif tries < wait
      sleep 1
      tries += 1
    else
      raise RestartTimeout, "The server didn't start in time. Please look at server's log file " +
                            "for more information, or set the value of 'wait' in your config " +
                            "file to be higher (defaults: 30)."
    end
  end
end