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.



28
29
30
31
 
# 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.



47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
 
# 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:



34
35
36
37
38
39
40
41
42
43
44
 
# 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 



90
91
92
 
# File 'lib/rubydns/rule_based_server.rb', line 90

def to_s
	@pattern.inspect
end