Class: Videoreg::Util

Inherits:
Object
  • Object
show all
Defined in:
lib/videoreg/util.rb

Class Method Summary collapse

Class Method Details

.amqp_url ⇒ Object

Extracts the connection string for the rabbitmq service from the service information provided by Cloud Foundry in an environment variable.



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# File 'lib/videoreg/util.rb', line 29

def amqp_url
  services = JSON.parse(ENV['VCAP_SERVICES'], :symbolize_names => true)
  url = services.values.map do |srvs|
    srvs.map do |srv|
      if srv[:label] =~ /^rabbitmq-/
        srv[:credentials][:url]
      else
        []
      end
    end
  end.flatten!.first
end

.humanize(secs) ⇒ Object 



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# File 'lib/videoreg/util.rb', line 43

def humanize(secs)
  [[60, :sec], [60, :min], [24, :hr], [1000, :days]].map { |count, name|
    if secs > 0
      secs, n = secs.divmod(count)
      "#{n.to_i}#{name}"
    end
  }.compact.reverse.join(' ')
end

.proc_alive?(pid) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/videoreg/util.rb', line 16

def proc_alive?(pid)
  return false unless pid
  begin
    Process.kill(0, pid)
    true
  rescue Errno::ESRCH
    false
  end
end

.udevinfo(maxcount) ⇒ Object 



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# File 'lib/videoreg/util.rb', line 53

def udevinfo(maxcount)
  res = []
  maxcount.times do |dnum|
    devpath_parts = nil
    Open4::popen4("udevadm info --query all --name video#{dnum} | grep DEVPATH") do |pid, stdin, stdout, stderr|
      devpath = stdout.read.match(/DEVPATH=(.*)\n$/)
      unless devpath.nil?
        devpath_parts = devpath[1].match(/(\/.*\/)(usb\d+)\/(\d*-\d*)((?:\/.*)?\/video4linux\/)(video(\d+))/)
      end
    end
    unless devpath_parts.nil?
      res << {
          :prefix => devpath_parts[1],
          :usbhub => devpath_parts[2],
          :usbport => devpath_parts[3],
          :postfix => devpath_parts[4],
          :device => "/dev/#{devpath_parts[5]}",
          :devnum => devpath_parts[6]
      }
    end
  end
  res
end

.which(cmd) ⇒ Object 



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# File 'lib/videoreg/util.rb', line 5

def which(cmd)
  exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
  ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
    exts.each { |ext|
      exe = "#{path}/#{cmd}#{ext}"
      return exe if File.executable? exe
    }
  end
  nil
end