Module: OnlineStatus

Defined in:
lib/onlinestatus.rb

Constant Summary collapse

KNOWN_GOOD_HOSTS = 
{
	# Some known good websites
	"www.google.com" => { tcp: 80 },
	"www.wikipedia.org" => { tcp: 80 },
	"www.facebook.com" => { tcp: 80 },
	"www.twitter.com" => { tcp: 80 },
	"www.youtube.com" => { tcp: 80 },

	# TODO: somehow ping DNS root servers?
	# DNS root server IPs
	#"198.41.0.4" => { udp: 53 }, # A
	#"192.228.79.201" => { udp: 53 }, # B
	#"192.33.4.12" => { udp: 53 }, # C
	#"199.7.91.13" => { udp: 53 }, # D
	#"192.203.230.10" => { udp: 53 }, # E
	#"192.5.5.241" => { udp: 53 }, # F
	#"192.112.36.4" => { udp: 53 }, # G
	#"128.63.2.53" => { udp: 53 }, # H
	#"192.36.148.17" => { udp: 53 }, # I
	#"192.58.128.30" => { udp: 53 }, # J
	#"193.0.14.129" => { udp: 53 }, # K
	#"199.7.83.42" => { udp: 53 }, # L
	#"202.12.27.33" => { udp: 53 }, # M
}

Class Method Summary collapse

Class Method Details

.offline ⇒ Object 



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# File 'lib/onlinestatus.rb', line 68

def self.offline
	offline?
end

.offline? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/onlinestatus.rb', line 64

def self.offline?
	!online?
end

.online ⇒ Object 



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# File 'lib/onlinestatus.rb', line 60

def self.online
	online?
end

.online? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/onlinestatus.rb', line 48

def self.online?
	# Online = at least 3 known good servers are pingable
	good_hosts = 0
	for host, methods in KNOWN_GOOD_HOSTS
		good_hosts += 1 if host_pingable?(host, methods)

		return true if good_hosts >= 3
	end

	false
end