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# encoding: UTF-8
require 'mauve/mauve_thread'
module Mauve
#
# This class is a singlton thread which pops updates off the
# Server#packet_buffer and processes them as alert updates.
#
# It is responsible for de-bouncing updates, i.e. ones with duplicate
# transmission IDs.
#
class Processor < MauveThread
include Singleton
# This is the time after which transmission IDs are expired.
#
attr_reader :transmission_cache_expire_time
# Initialize the processor
#
def initialize
super
#
# Set up the transmission id cache
#
@transmission_id_cache = {}
@transmission_cache_expire_time = 300
@transmission_cache_checked_at = Time.now
end
# @return [Log4r::Logger]
def logger
@logger ||= Log4r::Logger.new(self.class.to_s)
end
# Set the expiry time
#
# @param [Integer] i The number of seconds after which transmission IDs are considered unseen.
# @raise [ArgumentError] If +i+ is not an Integer
def transmission_cache_expire_time=(i)
raise ArgumentError, "transmission_cache_expire_time must be an integer" unless i.is_a?(Integer)
@transmission_cache_expire_time = i
end
# This expries the transmission cache
#
#
def expire_transmission_id_cache
now = Time.now
#
# Only check once every minute.
#
return unless (now - @transmission_cache_checked_at) > 60
to_delete = []
@transmission_id_cache.each do |tid, received_at|
to_delete << tid if (now - received_at) > @transmission_cache_expire_time
end
to_delete.each do |tid|
@transmission_id_cache.delete(tid)
end
@transmission_cache_checked_at = now
end
# This stops the processor, making sure all pending updates are saved.
#
def stop
super
#
# flush the queue
#
main_loop
end
private
# This is the main loop that does the processing.
#
def main_loop
sz = Server.packet_buffer_size
sz.times do
Timer.instance.freeze if Timer.instance.alive? and !Timer.instance.frozen?
#
# Hmm.. timer not frozen.
#
break unless Timer.instance.frozen?
data, client, received_at = Server.packet_pop
#
# Uh-oh. Nil data? That's craaaazy
#
break if data.nil?
# logger.debug("Got #{data.inspect} from #{client.inspect}")
ip_source = "#{client[3]}"
update = Proto::AlertUpdate.new
begin
update.parse_from_string(data)
if @transmission_id_cache[update.transmission_id.to_s]
logger.debug("Ignoring duplicate transmission id #{update.transmission_id}")
#
# Continue with next packet.
#
next
end
logger.debug "Update #{update.transmission_id} sent at #{update.transmission_time} from "+
"'#{update.source}'@#{ip_source} alerts #{update.alert.length}"
Alert.receive_update(update, received_at, ip_source)
rescue Protobuf::InvalidWireType,
NotImplementedError,
DataObjects::IntegrityError => ex
logger.error "#{ex} (#{ex.class}) while parsing #{data.length} bytes "+
"starting '#{data[0..15].inspect}' from #{ip_source}"
logger.debug ex.backtrace.join("\n")
ensure
@transmission_id_cache[update.transmission_id.to_s] = Time.now
end
end
ensure
#
# Thaw the timer
#
Timer.instance.thaw if Timer.instance.frozen?
end
end
end
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