import json import os import pprint import time from collections import deque from twisted.internet import reactor from twisted.application import service from twisted.application.internet import TimerService from zope.interface import implements from foolscap.api import eventually, DeadReferenceError, Referenceable, Tub from allmydata.util import log from allmydata.util.encodingutil import quote_local_unicode_path from allmydata.interfaces import RIStatsProvider, RIStatsGatherer, IStatsProducer class LoadMonitor(service.MultiService): implements(IStatsProducer) loop_interval = 1 num_samples = 60 def __init__(self, provider, warn_if_delay_exceeds=1): service.MultiService.__init__(self) self.provider = provider self.warn_if_delay_exceeds = warn_if_delay_exceeds self.started = False self.last = None self.stats = deque() self.timer = None def startService(self): if not self.started: self.started = True self.timer = reactor.callLater(self.loop_interval, self.loop) service.MultiService.startService(self) def stopService(self): self.started = False if self.timer: self.timer.cancel() self.timer = None return service.MultiService.stopService(self) def loop(self): self.timer = None if not self.started: return now = time.time() if self.last is not None: delay = now - self.last - self.loop_interval if delay > self.warn_if_delay_exceeds: log.msg(format='excessive reactor delay (%ss)', args=(delay,), level=log.UNUSUAL) self.stats.append(delay) while len(self.stats) > self.num_samples: self.stats.popleft() self.last = now self.timer = reactor.callLater(self.loop_interval, self.loop) def get_stats(self): if self.stats: avg = sum(self.stats) / len(self.stats) m_x = max(self.stats) else: avg = m_x = 0 return { 'load_monitor.avg_load': avg, 'load_monitor.max_load': m_x, } class CPUUsageMonitor(service.MultiService): implements(IStatsProducer) HISTORY_LENGTH = 15 POLL_INTERVAL = 60 def __init__(self): service.MultiService.__init__(self) # we don't use time.clock() here, because the constructor is run by # the twistd parent process (as it loads the .tac file), whereas the # rest of the program will be run by the child process, after twistd # forks. Instead, set self.initial_cpu as soon as the reactor starts # up. self.initial_cpu = 0.0 # just in case eventually(self._set_initial_cpu) self.samples = [] # we provide 1min, 5min, and 15min moving averages TimerService(self.POLL_INTERVAL, self.check).setServiceParent(self) def _set_initial_cpu(self): self.initial_cpu = time.clock() def check(self): now_wall = time.time() now_cpu = time.clock() self.samples.append( (now_wall, now_cpu) ) while len(self.samples) > self.HISTORY_LENGTH+1: self.samples.pop(0) def _average_N_minutes(self, size): if len(self.samples) < size+1: return None first = -size-1 elapsed_wall = self.samples[-1][0] - self.samples[first][0] elapsed_cpu = self.samples[-1][1] - self.samples[first][1] fraction = elapsed_cpu / elapsed_wall return fraction def get_stats(self): s = {} avg = self._average_N_minutes(1) if avg is not None: s["cpu_monitor.1min_avg"] = avg avg = self._average_N_minutes(5) if avg is not None: s["cpu_monitor.5min_avg"] = avg avg = self._average_N_minutes(15) if avg is not None: s["cpu_monitor.15min_avg"] = avg now_cpu = time.clock() s["cpu_monitor.total"] = now_cpu - self.initial_cpu return s class StatsProvider(Referenceable, service.MultiService): implements(RIStatsProvider) def __init__(self, node, gatherer_furl): service.MultiService.__init__(self) self.node = node self.gatherer_furl = gatherer_furl # might be None self.counters = {} self.stats_producers = [] # only run the LoadMonitor (which submits a timer every second) if # there is a gatherer who is going to be paying attention. Our stats # are visible through HTTP even without a gatherer, so run the rest # of the stats (including the once-per-minute CPUUsageMonitor) if gatherer_furl: self.load_monitor = LoadMonitor(self) self.load_monitor.setServiceParent(self) self.register_producer(self.load_monitor) self.cpu_monitor = CPUUsageMonitor() self.cpu_monitor.setServiceParent(self) self.register_producer(self.cpu_monitor) def startService(self): if self.node and self.gatherer_furl: nickname_utf8 = self.node.nickname.encode("utf-8") self.node.tub.connectTo(self.gatherer_furl, self._connected, nickname_utf8) service.MultiService.startService(self) def count(self, name, delta=1): val = self.counters.setdefault(name, 0) self.counters[name] = val + delta def register_producer(self, stats_producer): self.stats_producers.append(IStatsProducer(stats_producer)) def get_stats(self): stats = {} for sp in self.stats_producers: stats.update(sp.get_stats()) ret = { 'counters': self.counters, 'stats': stats } log.msg(format='get_stats() -> %(stats)s', stats=ret, level=log.NOISY) return ret def remote_get_stats(self): return self.get_stats() def _connected(self, gatherer, nickname): gatherer.callRemoteOnly('provide', self, nickname or '') class StatsGatherer(Referenceable, service.MultiService): implements(RIStatsGatherer) poll_interval = 60 def __init__(self, basedir): service.MultiService.__init__(self) self.basedir = basedir self.clients = {} self.nicknames = {} self.timer = TimerService(self.poll_interval, self.poll) self.timer.setServiceParent(self) def get_tubid(self, rref): return rref.getRemoteTubID() def remote_provide(self, provider, nickname): tubid = self.get_tubid(provider) if tubid == '': print "WARNING: failed to get tubid for %s (%s)" % (provider, nickname) # don't add to clients to poll (polluting data) don't care about disconnect return self.clients[tubid] = provider self.nicknames[tubid] = nickname def poll(self): for tubid,client in self.clients.items(): nickname = self.nicknames.get(tubid) d = client.callRemote('get_stats') d.addCallbacks(self.got_stats, self.lost_client, callbackArgs=(tubid, nickname), errbackArgs=(tubid,)) d.addErrback(self.log_client_error, tubid) def lost_client(self, f, tubid): # this is called lazily, when a get_stats request fails del self.clients[tubid] del self.nicknames[tubid] f.trap(DeadReferenceError) def log_client_error(self, f, tubid): log.msg("StatsGatherer: error in get_stats(), peerid=%s" % tubid, level=log.UNUSUAL, failure=f) def got_stats(self, stats, tubid, nickname): raise NotImplementedError() class StdOutStatsGatherer(StatsGatherer): verbose = True def remote_provide(self, provider, nickname): tubid = self.get_tubid(provider) if self.verbose: print 'connect "%s" [%s]' % (nickname, tubid) provider.notifyOnDisconnect(self.announce_lost_client, tubid) StatsGatherer.remote_provide(self, provider, nickname) def announce_lost_client(self, tubid): print 'disconnect "%s" [%s]' % (self.nicknames[tubid], tubid) def got_stats(self, stats, tubid, nickname): print '"%s" [%s]:' % (nickname, tubid) pprint.pprint(stats) class JSONStatsGatherer(StdOutStatsGatherer): # inherit from StdOutStatsGatherer for connect/disconnect notifications def __init__(self, basedir=u".", verbose=True): self.verbose = verbose StatsGatherer.__init__(self, basedir) self.jsonfile = os.path.join(basedir, "stats.json") if os.path.exists(self.jsonfile): f = open(self.jsonfile, 'rb') try: self.gathered_stats = json.load(f) except Exception: print ("Error while attempting to load stats file %s.\n" "You may need to restore this file from a backup," " or delete it if no backup is available.\n" % quote_local_unicode_path(self.jsonfile)) raise f.close() else: self.gathered_stats = {} def got_stats(self, stats, tubid, nickname): s = self.gathered_stats.setdefault(tubid, {}) s['timestamp'] = time.time() s['nickname'] = nickname s['stats'] = stats self.dump_json() def dump_json(self): tmp = "%s.tmp" % (self.jsonfile,) f = open(tmp, 'wb') json.dump(self.gathered_stats, f) f.close() if os.path.exists(self.jsonfile): os.unlink(self.jsonfile) os.rename(tmp, self.jsonfile) class StatsGathererService(service.MultiService): furl_file = "stats_gatherer.furl" def __init__(self, basedir=".", verbose=False): service.MultiService.__init__(self) self.basedir = basedir self.tub = Tub(certFile=os.path.join(self.basedir, "stats_gatherer.pem")) self.tub.setServiceParent(self) self.tub.setOption("logLocalFailures", True) self.tub.setOption("logRemoteFailures", True) self.tub.setOption("expose-remote-exception-types", False) self.stats_gatherer = JSONStatsGatherer(self.basedir, verbose) self.stats_gatherer.setServiceParent(self) try: with open(os.path.join(self.basedir, "location")) as f: location = f.read().strip() except EnvironmentError: raise ValueError("Unable to find 'location' in BASEDIR, please rebuild your stats-gatherer") try: with open(os.path.join(self.basedir, "port")) as f: port = f.read().strip() except EnvironmentError: raise ValueError("Unable to find 'port' in BASEDIR, please rebuild your stats-gatherer") self.tub.listenOn(port) self.tub.setLocation(location) ff = os.path.join(self.basedir, self.furl_file) self.gatherer_furl = self.tub.registerReference(self.stats_gatherer, furlFile=ff)