Class: StarlingServer::Runner

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/starling/server_runner.rb', line 22

def initialize
  @@instance = self
  parse_options

  @process = ProcessHelper.new(options[:logger], options[:pid_file], options[:user], options[:group])

  pid = @process.running?
  if pid
    STDERR.puts "There is already a Starling process running (pid #{pid}), exiting."
    exit(1)
  elsif pid.nil?
    STDERR.puts "Cleaning up stale pidfile at #{options[:pid_file]}."
  end

  start
end

Class Method Details

.run ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 14

def self.run
  new
end

.shutdown ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 18

def self.shutdown
  @@instance.shutdown
end

Instance Method Details

#drop_privileges ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 184

def drop_privileges
  Process.egid = options[:group] if options[:group]
  Process.euid = options[:user] if options[:user]
end

#load_config_file(filename) ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 39

def load_config_file(filename)
  config = YAML.load(ERB.new(File.read(filename)).result)

  unless config.is_a?(Hash)
    STDERR.puts "Config file does not contain a hash: #{filename}, exiting."
    exit(1)
  end

  if config['starling'].nil?
    STDERR.puts "Missing starling section in config file: #{filename}, exiting."
    exit(1)
  end

  config['starling'].each do |key, value|
    # alias some keys
    case key
    when "queue_path" then key = "path"
    when "log_file" then key = "logger"
    end

    if %w(logger path pid_file).include?(key)
      value = File.expand_path(value)
    end

    options[key.to_sym] = value

    if options[:log_level].instance_of?(String)
      options[:log_level] = Logger.const_get(options[:log_level])
    end
  end
end

#parse_options ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 71

def parse_options
  self.options = { :host => '127.0.0.1',
                   :port => 22122,
                   :path => File.join('', 'var', 'spool', 'starling'),
                   :log_level => Logger::INFO,
                   :daemonize => false,
                   :timeout => 0,
                   :pid_file => File.join('', 'var', 'run', 'starling.pid') }

  OptionParser.new do |opts|
    opts.summary_width = 25

    opts.banner = "Starling (#{StarlingServer::VERSION})\n\n",
                  "usage: starling [options...]\n",
                  "       starling --help\n",
                  "       starling --version\n"

    opts.separator ""
    opts.separator "Configuration:"

    opts.on("-f", "--config FILENAME",
            "Config file (yaml) to load") do |filename|
      load_config_file(filename)
    end

    opts.on("-q", "--queue_path PATH",
            :REQUIRED,
            "Path to store Starling queue logs", "(default: #{options[:path]})") do |queue_path|
      options[:path] = File.expand_path(queue_path)
    end

    opts.separator ""; opts.separator "Network:"

    opts.on("-hHOST", "--host HOST", "Interface on which to listen (default: #{options[:host]})") do |host|
      options[:host] = host
    end

    opts.on("-pHOST", "--port PORT", Integer, "TCP port on which to listen (default: #{options[:port]})") do |port|
      options[:port] = port
    end

    opts.separator ""; opts.separator "Process:"

    opts.on("-d", "Run as a daemon.") do
      options[:daemonize] = true
    end

    opts.on("-PFILE", "--pid FILENAME", "save PID in FILENAME when using -d option.", "(default: #{options[:pid_file]})") do |pid_file|
      options[:pid_file] = File.expand_path(pid_file)
    end

    opts.on("-u", "--user USER", "User to run as") do |user|
      options[:user] = user.to_i == 0 ? Etc.getpwnam(user).uid : user.to_i
    end

    opts.on("-gGROUP", "--group GROUP", "Group to run as") do |group|
      options[:group] = group.to_i == 0 ? Etc.getgrnam(group).gid : group.to_i
    end

    opts.separator ""; opts.separator "Logging:"

    opts.on("-L", "--log [FILE]", "Path to print debugging information.") do |log_path|
      options[:logger] = File.expand_path(log_path)
    end

    begin
      require 'syslog_logger'

      opts.on("-l", "--syslog CHANNEL", "Write logs to the syslog instead of a log file.") do |channel|
        options[:syslog_channel] = channel
      end
    rescue LoadError
    end

    opts.on("-v", "Increase logging verbosity (may be used multiple times).") do
      options[:log_level] -= 1
    end

    opts.on("-t", "--timeout [SECONDS]", Integer,
            "Time in seconds before disconnecting inactive clients (0 to disable).",
            "(default: #{options[:timeout]})") do |timeout|
      options[:timeout] = timeout
    end

    opts.separator ""; opts.separator "Miscellaneous:"

    opts.on_tail("-?", "--help", "Display this usage information.") do
      puts "#{opts}\n"
      exit
    end

    opts.on_tail("-V", "--version", "Print version number and exit.") do
      puts "Starling #{StarlingServer::VERSION}\n\n"
      exit
    end
  end.parse!
end

#setup_signal_traps ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 200

def setup_signal_traps
  Signal.trap("INT") { shutdown }
  Signal.trap("TERM") { shutdown }
end

#shutdown ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 189

def shutdown
  begin
    STDOUT.puts "Shutting down."
    StarlingServer::Base.logger.info "Shutting down."
    @server.stop
  rescue Object => e
    STDERR.puts "There was an error shutting down: #{e}"
    exit(70)
  end
end

#start ⇒ Object 



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# File 'lib/starling/server_runner.rb', line 169

def start
  drop_privileges

  @process.daemonize if options[:daemonize]

  setup_signal_traps
  @process.write_pid_file

  STDOUT.puts "Starting at #{options[:host]}:#{options[:port]}."
  @server = StarlingServer::Base.new(options)
  @server.run

  @process.remove_pid_file
end