Class: Net::Ping

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

Direct Known Subclasses

External, Ping::HTTP, Ping::ICMP, Ping::TCP, Ping::UDP

Defined Under Namespace

Classes: External, HTTP, ICMP, TCP, UDP

Constant Summary collapse

VERSION = 
'1.2.2'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host = nil, port = nil, timeout = 5) {|_self| ... } ⇒ Ping

The default constructor for the Net::Ping class. Accepts an optional host, port and timeout. The port defaults to your echo port, or 7 if that happens to be undefined. The default timeout is 5 seconds.

The host, although optional in the constructor, must be specified at some point before the Net::Ping#ping method is called, or else an ArgumentError will be raised.

Yields self in block context.

This class is not meant to be instantiated directly. It is strictly meant as an interface for subclasses.

Yields:

  • (_self)

Yield Parameters:

  • _self (Net::Ping) —

    the object that the method was called on



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# File 'lib/net/ping/ping.rb', line 50

def initialize(host=nil, port=nil, timeout=5)
   @host      = host
   @port      = port || Socket.getservbyname('echo') || 7
   @timeout   = timeout
   @exception = nil
   @warning   = nil
   @duration  = nil

   yield self if block_given?
end

Instance Attribute Details

#duration ⇒ Object (readonly)

The number of seconds (returned as a Float) that it took to ping the host. This is not a precise value, but rather a good estimate since there is a small amount of internal calculation that is added to the overall time.



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# File 'lib/net/ping/ping.rb', line 35

def duration
  @duration
end

#exception ⇒ Object (readonly)

If a ping fails, this value is set to the error that occurred which caused it to fail.



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# File 'lib/net/ping/ping.rb', line 22

def exception
  @exception
end

#host ⇒ Object

The host to ping. In the case of Ping::HTTP, this is the URI.



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# File 'lib/net/ping/ping.rb', line 9

def host
  @host
end

#port ⇒ Object

The port to ping. This is set to the echo port (7) by default. The Ping::HTTP class defaults to port 80.



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# File 'lib/net/ping/ping.rb', line 14

def port
  @port
end

#timeout ⇒ Object

The maximum time a ping attempt is made.



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# File 'lib/net/ping/ping.rb', line 17

def timeout
  @timeout
end

#warning ⇒ Object (readonly)

This value is set if a ping succeeds, but some other condition arose during the ping attempt which merits warning, e.g a redirect in the case of Ping::HTTP#ping.



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# File 'lib/net/ping/ping.rb', line 28

def warning
  @warning
end

Instance Method Details

#ping(host = @host) ⇒ Object Also known as: ping?, pingecho

The default interface for the Net::Ping#ping method. Each subclass should call super() before continuing with their own implementation in order to ensure that the @exception and @warning instance variables are reset.

If host is nil here, then it will use the host specified in the constructor. If the host is nil and there was no host specified in the constructor then an ArgumentError is raised. – The @duration should be set in the subclass’ ping method.

Raises:

  • (ArgumentError) 


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# File 'lib/net/ping/ping.rb', line 72

def ping(host = @host)
   raise ArgumentError, 'no host specified' unless host
   @exception = nil
   @warning   = nil
end