Module: Videoreg

Defined in:
lib/videoreg.rb,
lib/videoreg/base.rb,
lib/videoreg/util.rb,
lib/videoreg/config.rb,
lib/videoreg/lockfile.rb,
lib/videoreg/registrar.rb

Overview

Main videoreg module

Defined Under Namespace

Classes: Base, Config, Lockfile, Registrar, Util

Constant Summary collapse

VERSION =

configurable constants

"0.1"
DAEMON_NAME = 
"videoreg"
MAX_THREAD_WAIT_LIMIT_SEC =

time while daemon waits until capture thread exists

600
UDEV_RULES_FILE = 
'/etc/udev/rules.d/50-udev-videoreg.rules'

"webcam"
ALLOWED_CONFIG_OPTIONS =

internal constants

%w[mq_host mq_queue pid_path log_path device]
MSG_HALT = 
'HALT'
MSG_RECOVER = 
'RECOVER'
MSG_PAUSE = 
'PAUSE'
MSG_RESUME = 
'RESUME'
MSG2ACTION = 
{MSG_HALT => :halt!, MSG_PAUSE => :pause!, MSG_RESUME => :resume!, MSG_RECOVER => :recover!}

Class Method Summary collapse

Class Method Details

.calc_reg_list(device = :all) ⇒ Object

Calculate current registrars list



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# File 'lib/videoreg.rb', line 123

def calc_reg_list(device = :all)
  registrars.find_all { |dev, reg| device.to_sym == :all || device.to_s == dev }.map { |vp| vp[1] }
end

.init_dante_runner ⇒ Object

Initiate new dante runner



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# File 'lib/videoreg.rb', line 128

def init_dante_runner
  dante_opts = {:pid_path => '/tmp/videoreg.pid', :log_path => opt.log_path}
  dante_opts.merge!(:kill => true) if opt.action == :kill
  dante_opts.merge!(:pid_path => opt.pid_path) if opt.pid_path
  Dante::Runner.new(DAEMON_NAME, dante_opts)
end

.logger ⇒ Object 



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# File 'lib/videoreg.rb', line 90

def logger
  Videoreg::Base.logger
end

.mq_disconnect(connection) ⇒ Object

Disconnect from RabbitMQ



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# File 'lib/videoreg.rb', line 46

def mq_disconnect(connection)
  logger.info "Disconnecting from RabbitMQ..."
  connection.close { EM.stop { exit } }
end

.mq_listen(&block) ⇒ Object

Listen the incoming messages from RabbitMQ



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# File 'lib/videoreg.rb', line 52

def mq_listen(&block)
  Thread.new {
    begin
      logger.info "New messaging thread created for RabbitMQ #{opt.mq_host} / #{opt.mq_queue}"
      AMQP.start(:host => opt.mq_host) do |connection|
        q = AMQP::Channel.new(connection).queue(opt.mq_queue)
        q.subscribe do |msg|
          Videoreg::Base.logger.info "Received message from RabbitMQ #{msg}..."
          block.call(connection, msg) if block_given?
        end
        Signal.add_trap("TERM") { q.delete; mq_disconnect(connection) }
        Signal.add_trap(0) { q.delete; mq_disconnect(connection) }
      end
    rescue => e
      logger.error "Error during establishing the connection to RabbitMQ: #{e.message}"
      @dante_runner.stop if @dante_runner
    end
  }
end

.mq_send(message, arg = nil) ⇒ Object

Send a message to the RabbitMQ



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# File 'lib/videoreg.rb', line 73

def mq_send(message, arg = nil)
  AMQP.start(:host => opt.mq_host) do |connection|
    channel = AMQP::Channel.new(connection)
    logger.info "Publish message to RabbitMQ '#{message}' with arg '#{arg}' to '#{opt.mq_queue}'..."
    channel.default_exchange.publish({:msg => message, :arg => arg}.to_json, :routing_key => opt.mq_queue)
    EM.add_timer(0.5) { mq_disconnect(connection) }
  end
end

.opt(*args) ⇒ Object

Options



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# File 'lib/videoreg.rb', line 97

def opt(*args)
  if !args.empty? && args[0].is_a?(Hash)
    op = args[0].flatten
    run_options.send("#{op[0]}=", op[1])
  else
    run_options
  end
end

.reg(&block) ⇒ Object

Shortcut to create new registrar’s configuration



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# File 'lib/videoreg.rb', line 114

def reg(&block)
  r = Registrar.new
  Signal.add_trap(0) { r.safe_release! }
  r.logger = opt.logger if opt.logger
  r.config.instance_eval(&block)
  registrars[r.config.device] = r
end

.registrars ⇒ Object 



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# File 'lib/videoreg.rb', line 86

def registrars
  @registered_regs
end

.run(device = :all, action = opt.action) ⇒ Object

Shortcut to run action on registrar(s)



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# File 'lib/videoreg.rb', line 169

def run(device = :all, action = opt.action)

  # Input
  @registrars = calc_reg_list(device)
  @dante_runner = init_dante_runner
  opt.action, action = :run, :run if @dante_runner.daemon_stopped? && opt.action == :recover

  # Main actions switch
  puts "Running command '#{opt.action}' for device(s): '#{device}'..."
  case action
    when :kill then
      @dante_runner.stop
    when :pause then
      mq_send(MSG_PAUSE, device) if @dante_runner.daemon_running?
    when :resume then
      mq_send(MSG_RESUME, device) if @dante_runner.daemon_running?
    when :recover then
      mq_send(MSG_RECOVER, device) if @dante_runner.daemon_running?
    when :ensure then
      uptime = (@dante_runner.daemon_running?) ? Time.now - File.stat(opt.pid_path).ctime : 0
      [{:daemon_running? => @dante_runner.daemon_running?, :uptime => uptime}] + @registrars.map { |reg|
        {
            :device => reg.device,
            :device_exists? => reg.device_exists?,
            :process_alive? => reg.process_alive?,
            :paused? => reg.paused?
        }
      }
    when :halt then
      mq_send(MSG_HALT, device) if @dante_runner.daemon_running?
    when :run then
      @dante_runner.execute(:daemonize => true) {
        logger.info "Starting daemon with options: #{opt.marshal_dump}"
        run_daemon(@registrars)
      }
    when :reset then
      @registrars.each { |reg|
        reg.force_release_lock!
      }
      logger.info "Forced to release pidfile #{opt.pid_path}"
      File.unlink(opt.pid_path) if File.exists?(opt.pid_path)
    else
      raise "Unsupported action #{action} provided to runner!"
  end
end

.run_daemon(regs) ⇒ Object

Run daemon



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# File 'lib/videoreg.rb', line 136

def run_daemon(regs)
  Signal.add_trap("TERM") { File.unlink(opt.pid_path) if File.exists?(opt.pid_path) }
  @time_started = Time.now
  # Run message thread
  mq_listen do |connection, message|
    begin
      raise "Unexpected message struct received: #{message}!" unless (message = JSON.parse(message)).is_a?(Hash)
      opt.device = message["arg"] if message["arg"]
      if (action = MSG2ACTION[message["msg"]])
        logger.info "#{message["msg"]} MESSAGE RECEIVED!"
        calc_reg_list(opt.device).each { |reg| reg.send(action) }
      else
        logger.error "UNKNOWN MESSAGE RECEIVED!"
      end
    rescue => e
      logger.error "Exception during incoming message processing: #{e.message}: \n#{e.backtrace.join("\n")}"
    end
  end
  # Run main thread
  regs.map { |reg|
    logger.info "Starting continuous registration from device #{reg.device}..."
    {:reg => reg, :thread => reg.continuous}
  }.each { |reg_hash|
    while true do # avoid deadlock exception
      reg_hash[:thread].join(MAX_THREAD_WAIT_LIMIT_SEC)
      break if reg_hash[:reg].terminated? # break if thread was terminated
    end if reg_hash[:reg] && reg_hash[:thread]
  }
  @time_ended = Time.now
  logger.info "Daemon finished execution. Uptime #{@time_ended - @time_started} sec"
end

.run_options ⇒ Object 



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# File 'lib/videoreg.rb', line 82

def run_options
  @run_options
end

.version_info ⇒ Object

Version info



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# File 'lib/videoreg.rb', line 41

def version_info
  "#{DAEMON_NAME} v.#{VERSION}"
end