Class: RubyDNS::RuleBasedServer::Rule

Inherits:
Object
  • Object
show all
Defined in:
lib/rubydns/rule_based_server.rb

Overview

Represents a single rule in the server.

Instance Method Summary collapse

Constructor Details

#initialize(pattern, callback) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/rubydns/rule_based_server.rb', line 28

def initialize(pattern, callback)
  @pattern = pattern
  @callback = callback
end

Instance Method Details

#call(server, name, resource_class, transaction) ⇒ Object

Invoke the rule, if it matches the incoming request, it is evaluated and returns true, otherwise returns false.



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# File 'lib/rubydns/rule_based_server.rb', line 47

def call(server, name, resource_class, transaction)
  unless match(name, resource_class)
    server.logger.debug "<#{transaction.query.id}> Resource class #{resource_class} failed to match #{@pattern[1].inspect}!"
    
    return false
  end
  
  # Does this rule match against the supplied name?
  case @pattern[0]
  when Regexp
    match_data = @pattern[0].match(name)
    
    if match_data
      server.logger.debug "<#{transaction.query.id}> Regexp pattern matched with #{match_data.inspect}."
      
      @callback[transaction, match_data]
      
      return true
    end
  when String
    if @pattern[0] == name
      server.logger.debug "<#{transaction.query.id}> String pattern matched."
      
      @callback[transaction]
      
      return true
    end
  else
    if (@pattern[0].call(name, resource_class) rescue false)
      server.logger.debug "<#{transaction.query.id}> Callable pattern matched."
      
      @callback[transaction]
      
      return true
    end
  end
  
  server.logger.debug "<#{transaction.query.id}> No pattern matched."
  
  # We failed to match the pattern.
  return false
end

#match(name, resource_class) ⇒ Object

Returns true if the name and resource_class are sufficient:



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# File 'lib/rubydns/rule_based_server.rb', line 34

def match(name, resource_class)
  # If the pattern doesn't specify any resource classes, we implicitly pass this test:
  return true if @pattern.size < 2
  
  # Otherwise, we try to match against some specific resource classes:
  if Class === @pattern[1]
    @pattern[1] == resource_class
  else
    @pattern[1].include?(resource_class) rescue false
  end
end

#to_s ⇒ Object 



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# File 'lib/rubydns/rule_based_server.rb', line 90

def to_s
  @pattern.inspect
end