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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.delete_if do |tid, received_at|
(now - received_at) > @transmission_cache_expire_time
end
@transmission_cache_checked_at = now
end
# This stops the processor, making sure all pending updates are saved.
#
def stop
super
#
# flush the queue
#
do_processor
end
# This processes an incoming packet. It is in a seperate method so it can
# be (de)coupled as needed from the UDP server.
#
def process_packet(data, client, received_at)
#
# Uh-oh. Nil data? That's craaaazy
#
return nil if data.nil?
ip_source = "#{client[3]}"
update = Proto::AlertUpdate.new
update.parse_from_string(data)
if @transmission_id_cache[update.transmission_id.to_s]
logger.debug("Ignoring duplicate transmission id #{update.transmission_id}")
return nil
end
logger.debug "Update #{update.transmission_id} sent at #{update.transmission_time} received at #{received_at.to_i} 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
private
def main_loop
do_processor
do_timer unless timer_should_stop?
end
def do_timer
#
# Get the next alert.
#
next_alert = Alert.find_next_with_event
#
# If we didn't find an alert, or the alert we found is due in the future,
# look for the next alert_changed object.
#
if next_alert.nil? or next_alert.due_at > Time.now
next_alert_changed = AlertChanged.find_next_with_event
end
if next_alert_changed.nil? and next_alert.nil?
next_to_notify = nil
elsif next_alert.nil? or next_alert_changed.nil?
next_to_notify = (next_alert || next_alert_changed)
else
next_to_notify = ( next_alert.due_at < next_alert_changed.due_at ? next_alert : next_alert_changed )
end
#
# Nothing to notify?
#
if next_to_notify.nil?
#
# Sleep indefinitely
#
logger.info("Nothing to notify about -- snoozing for a while.")
sleep_loops = 600
else
#
# La la la nothing to do.
#
logger.info("Next to notify: #{next_to_notify} #{next_to_notify.is_a?(AlertChanged) ? "(reminder)" : "(heartbeat)"} -- snoozing until #{next_to_notify.due_at.iso8601}")
sleep_loops = ((next_to_notify.due_at - Time.now).to_f / 0.1).round.to_i
end
sleep_loops = 0 if sleep_loops.nil? or sleep_loops < 1
#
# Ah-ha! Sleep with a break clause.
#
sleep_loops.times do
#
# Start again if the situation has changed.
#
break if timer_should_stop?
#
# This is a rate-limiting step for alerts.
#
Kernel.sleep 0.1
end
return if timer_should_stop? or next_to_notify.nil?
next_to_notify.poll
end
# This is processor loop
#
def do_processor
sz = Server.packet_buffer_size
sz.times do
process_packet(*Server.packet_pop)
end
#
# Now expire the cache. This will only get processed at most once every minute.
#
expire_transmission_id_cache
end
def timer_should_stop?
(Server.packet_buffer_size > 0) or self.should_stop?
end
end
end
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