Class: Dnsruby::Cache
- Inherits:
-
Object
show all
- Defined in:
- lib/dnsruby/cache.rb
Overview
Defined Under Namespace
Classes: CacheData, CacheKey
Class Method Summary
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Instance Method Summary
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Constructor Details
#initialize ⇒ Cache
Returns a new instance of Cache.
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# File 'lib/dnsruby/cache.rb', line 32
def initialize()
@cache = Hash.new
@mutex = Mutex.new
end
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Class Method Details
.delete(qname, qtype, qclass = Classes.IN) ⇒ Object
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# File 'lib/dnsruby/cache.rb', line 83
def Cache.delete(qname, qtype, qclass = Classes.IN)
key = CacheKey.new(qname, qtype, qclass)
@mutex.synchronize {
@cache.delete(key)
}
end
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Instance Method Details
#add(message) ⇒ Object
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# File 'lib/dnsruby/cache.rb', line 47
def add(message)
q = message.question[0]
key = CacheKey.new(q.qname, q.qtype, q.qclass).to_s
data = CacheData.new(message)
@mutex.synchronize {
if (@cache[key])
TheLog.debug("CACHE REPLACE : #{q.qname}, #{q.qtype}\n")
else
TheLog.debug("CACHE ADD : #{q.qname}, #{q.qtype}\n")
end
@cache[key] = data
}
end
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#cache ⇒ Object
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# File 'lib/dnsruby/cache.rb', line 36
def cache
@cache
end
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#clear ⇒ Object
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# File 'lib/dnsruby/cache.rb', line 39
def clear()
@mutex.synchronize {
@cache = Hash.new
}
end
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#find(qname, qtype, qclass = Classes.IN) ⇒ Object
This method “fixes up” the response, so that the header and ttls are OK
The resolver will still need to copy the flags and ID across from the query
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# File 'lib/dnsruby/cache.rb', line 62
def find(qname, qtype, qclass = Classes.IN)
qn = Name.create(qname)
qn.absolute = true
key = CacheKey.new(qn, qtype, qclass).to_s
@mutex.synchronize {
data = @cache[key]
if (!data)
return nil
end
if (data.expiration <= Time.now.to_i)
@cache.delete(key)
TheLog.debug("CACHE lookup stale\n")
return nil
end
m = data.message
TheLog.debug("CACHE found\n")
return m
}
end
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#length ⇒ Object
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# File 'lib/dnsruby/cache.rb', line 44
def length
return @cache.length
end
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