Class: Cluster::Refresh

Inherits:
Object
  • Object
show all
Includes:
Mongrel::Command::Base
Defined in:
lib/mongrel-cluster-refresh/init.rb

Instance Method Summary collapse

Instance Method Details

#collect_mongrel_stats ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 43

def collect_mongrel_stats
  start_port = @options["port"].to_i
  end_port = start_port + @options["servers"].to_i - 1
  
  mongrel_instance_base = {
    :port => nil,
    :pid => nil,
    :cpu => nil,
    :mem => nil
  }
  
  @mongrels = (start_port..end_port).inject([]) do |mongrels, port|
    mongrel = mongrel_instance_base.dup
    begin
      mongrel[:port] = port
      mongrel[:pid] = File.read(port_pid_file(port)).strip.to_i
      
      process_string = `ps -p #{mongrel[:pid]} -o pcpu= -o pmem=`

      if(process_string.nil? || process_string.strip == "")
        if @clean
          File.unlink(port_pid_file(port))
          puts "missing process: removing #{port_pid_file(port)}"
        end
        
        next(mongrels)
      end

      cpu, mem = process_string.split(" ").map { |field| field.strip }
      
      mongrel[:cpu] = cpu.to_f
      mongrel[:mem] = mem.to_f

      mongrels << mongrel
    ensure
      mongrels
    end
  end

  @mongrels = @mongrels.sort_by { |mongrel| [-mongrel[:mem], -mongrel[:cpu], mongrel[:pid]] }
end

#configure ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 10

def configure
  options [
           ['-C', '--config PATH', 'Path to cluster configuration file', :@config_file, "config/mongrel_cluster.yml"],
           ['-R', '--refresh NUM', 'Number of mongrels to refresh', :@refresh_num, nil],
           ['', '--clean', "Remove orphaned pid files", :@clean, false],
          ]
end

#port_pid_file(port) ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 92

def port_pid_file(port)
  pid_file_ext = File.extname(@options["pid_file"])
  pid_file_base = File.basename(@options["pid_file"], pid_file_ext)

  path = []
  path << @options["cwd"] if @options["cwd"]
  path << File.dirname(@options["pid_file"])
  pid_file_dir = File.join(path)
  
  pid_file = [pid_file_base, port].join(".") + pid_file_ext
  File.join(pid_file_dir, pid_file)
end

#read_config ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 29

def read_config
  @options = {
    "port" => 3000,
    "pid_file" => "tmp/pids/mongrel.pid",
    "servers" => 2
  }

  conf = YAML.load_file(@config_file)
  @options.merge!(conf) if conf

  third_of_servers = @options["servers"].to_i/3
  @refresh_num ||= (third_of_servers.zero? ? 1 : third_of_servers)
end

#refresh ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 85

def refresh
  @mongrels.first(@refresh_num).each do |mongrel|
    puts "restarting mongrel on port #{mongrel[:port]}"
    Process.kill("USR2", mongrel[:pid])
  end
end

#run ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 23

def run
  read_config
  collect_mongrel_stats
  refresh
end

#validate ⇒ Object 



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# File 'lib/mongrel-cluster-refresh/init.rb', line 18

def validate
  valid_exists?(@config_file, "Configuration file does not exist")
  @valid
end