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Class: EventMachine::DNS::Resolver

Relationships & Source Files
Inherits: Object
Defined in: lib/em/resolver.rb

Constant Summary

Class Attribute Summary

Class Method Summary

Class Attribute Details

.nameservers (rw)

[ GitHub ] 

  


# File 'lib/em/resolver.rb', line 36



def self.nameservers
  return @nameservers if @nameservers

  if windows?
    _, ns = Win32::Resolv.get_resolv_info
    return @nameservers = ns || []
  end

  @nameservers = []
  IO.readlines('/etc/resolv.conf').each do |line|
    if line =~ /^nameserver (.+)$/
      @nameservers << $1.split(/\s+/).first
    end
  end

  @nameservers
rescue
  @nameservers = []
end


  








  

    .nameservers=(ns)   (rw)
  

  [ GitHub ]


  

  


# File 'lib/em/resolver.rb', line 32



def self.nameservers=(ns)
  @nameservers = ns
end


  








  

    .windows?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/em/resolver.rb', line 5



def self.windows?
  if RUBY_PLATFORM =~ /mswin32|cygwin|mingw|bccwin/
    require 'win32/resolv'
    true
  else
    false
  end
end


  







Class Method Details



  

    .hosts  
  

  [ GitHub ]


  

  


# File 'lib/em/resolver.rb', line 60



def self.hosts
  return @hosts if @hosts

  @hosts = {}
  IO.readlines(HOSTS_FILE).each do |line|
    next if line =~ /^#/
    addr, host = line.split(/\s+/)

    next unless addr && host
    @hosts[host] ||= []
    @hosts[host] << addr
  end

  @hosts
rescue
  @hosts = {}
end


  








  

    .nameserver  
  

  [ GitHub ]


  

  


# File 'lib/em/resolver.rb', line 56



def self.nameserver
  nameservers.shuffle.first
end


  








  

    .resolve(hostname)  
  

  [ GitHub ]


  

  


# File 'lib/em/resolver.rb', line 20



def self.resolve(hostname)
  Request.new(socket, hostname)
end


  








  

    .socket  
  

  [ GitHub ]


  

  


# File 'lib/em/resolver.rb', line 24



def self.socket
  if @socket && @socket.error?
    @socket = Socket.open
  else
    @socket ||= Socket.open
  end
end