Class: Net::DNS::MDNS::Answer

Inherits:
Object
  • Object
show all
Defined in:
lib/net/dns/mdns.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, ttl, data, cacheflush) ⇒ Answer

Returns a new instance of Answer.



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# File 'lib/net/dns/mdns.rb', line 212

def initialize(name, ttl, data, cacheflush)
  @name = name
  @ttl = ttl
  @data = data
  @cacheflush = cacheflush
  @toa = Time.now.to_i
  @retries = 0
end

Instance Attribute Details

#cacheflush ⇒ Object (readonly)

Returns the value of attribute cacheflush.



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# File 'lib/net/dns/mdns.rb', line 207

def cacheflush
  @cacheflush
end

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/net/dns/mdns.rb', line 207

def data
  @data
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/net/dns/mdns.rb', line 207

def name
  @name
end

#retries ⇒ Object

Returns the value of attribute retries.



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# File 'lib/net/dns/mdns.rb', line 210

def retries
  @retries
end

#toa ⇒ Object (readonly)

TOA - time of arrival (of an answer)



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# File 'lib/net/dns/mdns.rb', line 209

def toa
  @toa
end

#ttl ⇒ Object (readonly)

Returns the value of attribute ttl.



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# File 'lib/net/dns/mdns.rb', line 207

def ttl
  @ttl
end

Instance Method Details

#absolute? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/net/dns/mdns.rb', line 241

def absolute?
  @cacheflush
end

#expired? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/net/dns/mdns.rb', line 237

def expired?
  true if Time.now.to_i > expiry
end

#expiry ⇒ Object 



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# File 'lib/net/dns/mdns.rb', line 233

def expiry
  toa + (ttl == 0 ? 1 : ttl)
end

#refresh ⇒ Object 



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# File 'lib/net/dns/mdns.rb', line 225

def refresh
  # Percentage points are from mDNS
  percent = [80,85,90,95][retries]

  # TODO - add a 2% of TTL jitter
  toa + ttl * percent / 100 if percent
end

#to_s ⇒ Object 



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# File 'lib/net/dns/mdns.rb', line 245

def to_s
  s = "#{name.to_s} (#{ttl}) "
  s << '!' if absolute?
  s << '-' if ttl == 0
  s << " #{DNS.rrname(data)}"

  case data
  when IN::A
    s << " #{data.address.to_s}"
  when IN::PTR
    s << " #{data.name}"
  when IN::SRV
    s << " #{data.target}:#{data.port}"
  when IN::TXT
    s << " #{data.strings.first.inspect}#{data.strings.length > 1 ? ', ...' : ''}"
  when IN::HINFO
    s << " os=#{data.os}, cpu=#{data.cpu}"
  else
    s << data.inspect
  end
  s
end

#type ⇒ Object 



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# File 'lib/net/dns/mdns.rb', line 221

def type
  data.class
end