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fetcher.py
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fetcher.py
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import signal
import sys
import time
import logging
import ConfigParser
from dateutil import tz
from datetime import datetime
from datetime import timedelta
from google.appengine.ext.remote_api import remote_api_stub
from google.appengine.api.logservice import logservice
from google.appengine.ext.remote_api.remote_api_stub import ConfigurationError
from google.appengine.tools.remote_api_shell import DEFAULT_PATH as REMOTE_API_PATH
import getpass
import simplejson as json
import base64
import argparse
RECOVERY_LOG = '/tmp/recovery.log'
# end_time is 3 mins before now
PERIOD_END_NOW = timedelta(minutes=3)
# period length
PERIOD_LENGTH = timedelta(minutes=1)
GAE_TZ = tz.gettz('US/Pacific')
logger = logging.getLogger()
last_offset = None
last_time_period = None
ENCODING = "ISO-8859-1"
def _get_level(level):
# TODO - better?
if logservice.LOG_LEVEL_DEBUG == level:
return "DEBUG"
if logservice.LOG_LEVEL_INFO == level:
return "INFO"
if logservice.LOG_LEVEL_WARNING == level:
return "WARNING"
if logservice.LOG_LEVEL_ERROR == level:
return "ERROR"
if logservice.LOG_LEVEL_CRITICAL == level:
return "CRITICAL"
return "UNKNOWN"
def _prepare_json(req_log):
"""Prepare JSON in logstash json_event format"""
data = {}
data['response'] = req_log.status
data['latency_ms'] = req_log.latency
# Timestamp - this helps if events are not coming in chronological order
t = datetime.fromtimestamp(req_log.end_time)
t = t.replace(tzinfo=GAE_TZ)
data['@timestamp'] = t.isoformat()
# processing APP Logs
msg = req_log.combined
if len(req_log.app_logs) > 0:
app_log_msgs = []
for app_log in req_log.app_logs:
t = datetime.fromtimestamp(app_log.time)
t = t.replace(tzinfo=GAE_TZ)
l = _get_level(app_log.level)
app_log_msgs.append("%s %s %s"
%(t.isoformat(), l, app_log.message) )
# The new lines give it more readability in Kibana
msg = msg + "\n\n" + "\n".join(app_log_msgs)
data['@message'] = msg
return json.dumps(data, encoding=ENCODING)
def termination_handler(signal, frame):
_offset = base64.urlsafe_b64encode(str(last_offset))
logger.info("Shutting down. Was processing : %s %s "
%(last_time_period, _offset))
sys.exit(0)
def get_time_period():
# GAE logservice API expects everything in PDT
gae_tz = GAE_TZ
end = datetime.now(gae_tz) - PERIOD_END_NOW
#seconds, microsecond =0
end = datetime(end.year, end.month, end.day, end.hour, end.minute, 0,0, end.tzinfo)
start = end - PERIOD_LENGTH
e = int(end.strftime("%s"))
s = int(start.strftime("%s"))
return {'start':s, 'end':e, 'start_human':start, 'end_human':end}
def _split_time_period(start,end, interval_s=10):
"""
Splits given time_period in segments based on interval
and returns a list of tuples [(start,end),...]
Uses seconds since epoch
"""
r = range(start, end, interval_s)
segments = []
for s in r:
e = s + interval_s
if e > end:
e = end
segment = (s, e)
segments.append(segment)
logger.debug("Splitted %s:%s into %d segments - %s" % (start,end,len(segments),segments))
return segments
def fetch_logs(time_period, recovery_log, username, password, app_name, version_ids, offset=None, dest="/tmp/gae_log.log",append=False):
f = lambda : (username, password)
try:
remote_api_stub.ConfigureRemoteApi(None, REMOTE_API_PATH, f, app_name)
except ConfigurationError:
# Token expired?
logger.exception("Token validation failed. Probably expired. Will retry")
remote_api_stub.ConfigureRemoteApi(None, REMOTE_API_PATH, f, app_name)
logger.info("Successfully authenticated")
version_ids = version_ids
logger.info("Fetching logs from %s to %s (GAE TZ)"
% (time_period['start_human'],time_period['end_human']))
end = time_period['end']
start = time_period['start']
intervals = _split_time_period(start,end)
# TODO - move to classes instead of globals
global last_time_period
last_time_period = time_period
i = 0
if append:
mode = 'a'
else:
mode = 'w'
f = open(dest, mode)
try:
for interval in intervals:
start, end = interval
logger.info("Interval : %s - %s" % (start,end))
for req_log in logservice.fetch(end_time=end,
start_time=start,
minimum_log_level=logservice.LOG_LEVEL_INFO,
version_ids=version_ids,
include_app_logs=True, include_incomplete=True,
offset=offset):
logger.debug("Retrieved - %s" % req_log.combined)
i = i + 1
if i % 100 == 0:
logger.info("Fetched %d req logs so far" % i)
f.write(_prepare_json(req_log))
f.write('\n')
# keeping track in case - if need to resume
global last_offset
last_offset = req_log.offset
# end fetch
# end interval
except:
logger.exception("Something went wrong")
save_recovery_info()
logger.info("Retrieved %d logs. Done." % i)
f.close()
return ""
def save_recovery_info():
#TODO
pass
if __name__ == '__main__':
signal.signal(signal.SIGINT, termination_handler)
signal.signal(signal.SIGTERM, termination_handler)
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
ch = logging.StreamHandler()
ch.setFormatter(formatter)
logger.addHandler(ch)
# other run time options
parser = argparse.ArgumentParser()
parser.add_argument("log_dump_file", help="Name of file to dump logs in Json")
parser.add_argument("--append", help="Append instead of overwrite to log-dump-file", action='store_true')
parser.add_argument("--gae_config",
help="Config file for GAE user, pass, app. If not specified, it looks for fetcher.conf")
parser.add_argument("--debug", help="use DEBUG log level", action='store_true')
args = parser.parse_args()
if args.debug:
logger.setLevel(logging.DEBUG)
dump = args.log_dump_file
append = args.append
# getting app name & credentials from a file
conf = args.gae_config or 'fetcher.conf'
config = ConfigParser.SafeConfigParser()
config.read(conf)
username = config.get('GAE','username')
password = config.get('GAE','password')
app_name = config.get('GAE','app_name')
version_ids = ['1']
offset = None
fetch_logs(get_time_period(), RECOVERY_LOG, username, password, app_name, version_ids, offset, dump, append)