import threading
import time
from logger import Logger

class Expirer(threading.Thread):
    def __init__(self, entries, eventLifeTime, nullAddress, dnsq):
        threading.Thread.__init__(self)
        self.entries = entries
        self.eventLifeTime = eventLifeTime
        self.nullAddress = nullAddress
        self.dnsq = dnsq
        self.setDaemon(True)

    def run(self):
        while True:
            Logger.log("Expiring ...")
            currentTime = int(time.time())
            for entry in  self.entries.values():
                Logger.log("Checking %s" % str(entry))
                if entry.lastEventTime != 0 and entry.lastEventTime + self.eventLifeTime < currentTime:
                    Logger.log("Entry %s expired" % entry.dynid)
                    entry.lastEventTime = 0
                    entry.address = self.nullAddress
                    Logger.log("Set in DNS: %s -> %s" % (entry.name, entry.address))
                    try:
                        self.dnsq.put_nowait(entry)
                    except Queue.Full, e:
                        Logger.log("Dns Queue overrun, drop expiry of %s" % str(entry))
            time.sleep(10)