Class: Network::Monitor::Interface

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
lib/network/monitor/interface.rb

Constant Summary collapse

Counter32Max = 
(2**32) - 1
QueryColumns = 
["ifIndex", "ifSpeed", "ifInOctets", "ifInErrors", "ifOutOctets", "ifOutErrors"]

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.hosts ⇒ Object 



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# File 'lib/network/monitor/interface.rb', line 33

def self.hosts
	Interface.all.group("host").collect { |r| r.host }
end

.print_statistics(out, min = 0.01) ⇒ Object 



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# File 'lib/network/monitor/interface.rb', line 86

def self.print_statistics(out, min = 0.01)
	unused_count = 0

	error_interfaces = []

	out.puts "Utilization Report @ #{Time.now.to_s}".center(84)
	Interface.all.group("host, ifIndex").each do |iface|
		r2, r1 = Interface.where("host = ? and ifIndex = ?", iface.host, iface.ifIndex).limit(2).order("created_at desc").to_a

		next if r1 == nil or r2 == nil

		unused = true
		name = iface.host

		s = r2.statistics(r1)
   
		if s[:ifInErrors] > 0 or s[:ifOutErrors] > 0
			error_interfaces << [iface, name, s]
			unused = false
		end
   
		if s[:ifInUsage] > min or s[:ifOutUsage] > min
			out.print "#{name.rjust(20)}: #{iface.ifIndex.to_s.rjust(4)}    "

			[[:ifInUsage, "IN%"], [:ifOutUsage, "OUT%"]].each do |v|
				key, name = *v
       
				out.print name.rjust(8)
				out.print sprintf("%0.2f\%", s[key] * 100.0).rjust(8)
			end
			out.puts r1.speed_string.rjust(10)
     
			unused = false
		end
   
		unused_count += 1 if unused
	end
 
	if error_interfaces.size > 0
		out.puts "Errors Detected".center(84)
		error_interfaces.each do |r|
			iface, name, s = r
     
			out.print "#{name.rjust(20)}: #{iface.ifIndex.to_s.rjust(4)}    "
     
			[[:ifInErrors, "IN\#"], [:ifOutErrors, "OUT\#"]].each do |v|
				key, name = v
       
				out.print name.rjust(5)
				out.print s[key].to_s.rjust(8)
			end
     
			out.puts
		end
	end
 
	out.puts "#{unused_count} ports not displayed.".center(84)
end

.query(host) ⇒ Object 



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# File 'lib/network/monitor/interface.rb', line 37

def self.query(host)
	SNMP::Manager.open(:Host => host, :Version => :SNMPv1) do |manager|
		manager.walk(QueryColumns) do |row|
			next if row[1].value.to_i == 0 # Speed of interface is reported as 0 by some faulty equipment, ignore these ports.

			record = Interface.new(:host => host)

			QueryColumns.each_with_index do |c,i|
				record.send("#{c}=", row[i].value.to_i)
			end

			record.save!
		end
	end
end

Instance Method Details

#previous ⇒ Object 



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# File 'lib/network/monitor/interface.rb', line 82

def previous
	Interface.where("host = ? and ifIndex = ? and id < ?", host, ifIndex, id).limit(1).order("created_at desc").first
end

#speed_string ⇒ Object 



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# File 'lib/network/monitor/interface.rb', line 78

def speed_string
	bits_to_string(ifSpeed.to_i)
end

#statistics(prev) ⇒ Object 



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# File 'lib/network/monitor/interface.rb', line 53

def statistics(prev)
	dt = (created_at - prev.created_at).to_f
	s = {
		:startTime => prev.created_at,
		:endTime => created_at,
		:timePeriod => created_at - prev.created_at,
		:ifInOctets => ifInOctets - prev.ifInOctets,
		:ifOutOctets => ifOutOctets - prev.ifOutOctets,
		:ifInErrors => ifInErrors - prev.ifInErrors,
		:ifOutErrors => ifOutErrors - prev.ifOutErrors
	}

	# Counter32 may wrap and produce strange results unless we deal with it..
	[:ifInOctets, :ifOutOctets, :ifInErrors, :ifOutErrors].each do |c|
		if s[c] < 0
			s[c] = Counter32Max + s[c]
		end
	end

	s[:ifInUsage] = (s[:ifInOctets].to_f * 8.0) / (ifSpeed.to_f * dt)
	s[:ifOutUsage] = (s[:ifOutOctets].to_f * 8.0) / (ifSpeed.to_f * dt)

	return s
end