90 lines
2.9 KiB
Ruby
90 lines
2.9 KiB
Ruby
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require 'socket'
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require 'timeout'
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# The Net module serves as a namespace only.
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#
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module Net
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# The Ping class serves as an abstract base class for all other Ping class
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# types. You should not instantiate this class directly.
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#
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class Ping
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# The version of the net-ping library.
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VERSION = '1.7.1'
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# The host to ping. In the case of Ping::HTTP, this is the URI.
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attr_accessor :host
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# The port to ping. This is set to the echo port (7) by default. The
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# Ping::HTTP class defaults to port 80.
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#
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attr_accessor :port
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# The maximum time a ping attempt is made.
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attr_accessor :timeout
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# If a ping fails, this value is set to the error that occurred which
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# caused it to fail.
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#
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attr_reader :exception
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# This value is set if a ping succeeds, but some other condition arose
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# during the ping attempt which merits warning, e.g a redirect in the
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# case of Ping::HTTP#ping.
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#
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attr_reader :warning
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# The number of seconds (returned as a Float) that it took to ping
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# the host. This is not a precise value, but rather a good estimate
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# since there is a small amount of internal calculation that is added
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# to the overall time.
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#
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attr_reader :duration
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# The default constructor for the Net::Ping class. Accepts an optional
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# +host+, +port+ and +timeout+. The port defaults to your echo port, or
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# 7 if that happens to be undefined. The default timeout is 5 seconds.
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#
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# The host, although optional in the constructor, must be specified at
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# some point before the Net::Ping#ping method is called, or else an
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# ArgumentError will be raised.
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#
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# Yields +self+ in block context.
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#
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# This class is not meant to be instantiated directly. It is strictly
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# meant as an interface for subclasses.
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#
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def initialize(host=nil, port=nil, timeout=5)
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@host = host
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@port = port || Socket.getservbyname('echo') || 7
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@timeout = timeout
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@exception = nil
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@warning = nil
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@duration = nil
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yield self if block_given?
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end
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# The default interface for the Net::Ping#ping method. Each subclass
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# should call super() before continuing with their own implementation in
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# order to ensure that the @exception and @warning instance variables
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# are reset.
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#
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# If +host+ is nil here, then it will use the host specified in the
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# constructor. If the +host+ is nil and there was no host specified
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# in the constructor then an ArgumentError is raised.
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#--
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# The @duration should be set in the subclass' ping method.
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#
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def ping(host = @host)
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raise ArgumentError, 'no host specified' unless host
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@exception = nil
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@warning = nil
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@duration = nil
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end
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alias ping? ping
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alias pingecho ping
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end
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end
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