def __init__(self, log_path, hit_threshold=2000):
"""
Construct an HTTP access log monitor
:param log_path: path to the w3c-formatted HTTP access log file
:param hit_threshold: alert when hits in the last 2 mins exceeds this
"""
self.hit_threshold = hit_threshold
self.log_tailer = LogfileTailer(log_path=log_path, parser=W3cParser())
self.records = None
self.process_time = None
self.hits_alert_active = False
self.alerts = []
class Monitor(object):
"""
Monitor HTTP traffic by consuming an actively written-to w3c-formatted HTTP access log
"""
# Which fields to count the bandwidth and number of unique hits for
fields_to_count = ('section', 'host', 'page', 'status')
# Monitor latest traffic up to this long ago for hit threshold breaches
hit_threshold_window = timedelta(seconds=120)
# How many records to display for each field of interest
top_n_to_display = 5
def __init__(self, log_path, hit_threshold=2000):
"""
Construct an HTTP access log monitor
:param log_path: path to the w3c-formatted HTTP access log file
:param hit_threshold: alert when hits in the last 2 mins exceeds this
"""
self.hit_threshold = hit_threshold
self.log_tailer = LogfileTailer(log_path=log_path, parser=W3cParser())
self.records = None
self.process_time = None
self.hits_alert_active = False
self.alerts = []
def reset_stats(self):
self.counts = defaultdict(Counter)
self.bandwidths = defaultdict(Counter)
self.totals = defaultdict(int)
def update_stats(self, records):
# Get counts for every field
for record in records:
for field in self.fields_to_count:
self.counts[field][getattr(record, field)] += 1
self.bandwidths[field][getattr(record, field)] += record.bytes
self.totals['bytes'] += record.bytes
self.totals['requests'] += len(records)
# Get totals of unique requests
for field, counter in self.counts.iteritems():
self.totals[field] = len(counter)
def update_recent_stats(self):
# Update stats based on a recent timeframe. Requires considering all records,
# not just the latest batch (though only those in the most recent window)
self.recent_hits = 0
now = datetime.now()
i = len(self.records) - 1
while i >= 0 and self.records[i].date > (now - self.hit_threshold_window):
self.recent_hits += 1
i -= 1
def check_alerts(self):
if self.recent_hits > self.hit_threshold and not self.hits_alert_active:
self.alerts.append(Alert(self.hit_threshold, self.recent_hits))
self.hits_alert_active = True
elif self.recent_hits <= self.hit_threshold and self.hits_alert_active:
self.alerts.append(Alert(self.hit_threshold, self.recent_hits))
self.hits_alert_active = False
def output_to_console(self):
print '#################################'
print 'Processed in {0:.3}s at {1}'.format(self.process_time,
datetime.now().strftime(DATE_FORMAT))
if len(self.records) > 0:
print 'Period: {0} - {1}'.format(
self.records[0].date.strftime(DATE_FORMAT),
self.records[-1].date.strftime(DATE_FORMAT)
)
print
self.totals['pretty_bytes'] = pretty_bytes(self.totals['bytes'])
print 'Hits: {requests}\tUsers: {host}\tData: {pretty_bytes}'.format(**self.totals)
print 'Sections: {section}\tPages: {page}\t'.format(**self.totals)
print 'Hits in last {0}s: {1}'.format(self.hit_threshold_window.seconds, self.recent_hits)
print
print 'No alerts to display' if not self.alerts else 'Alerts:'
for alert in reversed(self.alerts):
print alert
print
# TODO: use a table module to do this neater and more compactly
for field, top_n_for_field in self.counts.iteritems():
print 'Most hits by {0}'.format(field)
for item, count in top_n_for_field.most_common(self.top_n_to_display):
print '{0} ({1} hits, {2})'.format(
item, count, pretty_bytes(self.bandwidths[field][item])
)
print
print '#################################'
def process_new_records(self, records, reset):
if reset:
print 'Generating initial stats from w3c log'
self.reset_stats()
self.records = records
else:
print 'Updating stats with {0} new requests'.format(len(records))
self.records.extend(records)
self.update_stats(records)
self.update_recent_stats()
self.check_alerts()
def run(self, tail=True, frequency=10):
"""
Start the Monitor process, which runs continuously unless tail is False
:param tail: loop continuously
:param frequency: how often to get new records (only if tail is True)
"""
print 'Parsing initial log file'
while True:
start = time.time()
try:
new_records, file_state = self.log_tailer.get_latest()
except IOError as e:
print e
return
parse_time = time.time()
print 'Parsed in {0:.3}s'.format(parse_time - start)
# Even if we have no new records, issue an update,
# since the time-dependent stats will have changed
self.process_new_records(new_records, reset=(file_state == LogfileTailer.FILE_RESET))
self.process_time = time.time() - parse_time
self.output_to_console()
if not tail:
return
time.sleep(frequency)
