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"""Our log handlers for Python's logging package.
"""
import os, time, socket
import logging, logging.handlers
from skytools.psycopgwrapper import connect_database
from skytools.quoting import quote_json
_service_name = 'unknown_svc'
def set_service_name(service_name):
global _service_name
_service_name = service_name
# configurable file logger
class EasyRotatingFileHandler(logging.handlers.RotatingFileHandler):
"""Easier setup for RotatingFileHandler."""
def __init__(self, filename, maxBytes = 10*1024*1024, backupCount = 3):
"""Args same as for RotatingFileHandler, but in filename '~' is expanded."""
fn = os.path.expanduser(filename)
logging.handlers.RotatingFileHandler.__init__(self, fn, maxBytes=maxBytes, backupCount=backupCount)
# send JSON message over UDP
class UdpLogServerHandler(logging.handlers.DatagramHandler):
"""Sends log records over UDP to logserver in JSON format."""
# map logging levels to logserver levels
_level_map = {
logging.DEBUG : 'DEBUG',
logging.INFO : 'INFO',
logging.WARNING : 'WARN',
logging.ERROR : 'ERROR',
logging.CRITICAL: 'FATAL',
}
# JSON message template
_log_template = '{\n\t'\
'"logger": "skytools.UdpLogServer",\n\t'\
'"timestamp": %.0f,\n\t'\
'"level": "%s",\n\t'\
'"thread": null,\n\t'\
'"message": %s,\n\t'\
'"properties": {"application":"%s", "apptype": "%s", "type": "sys", "hostname":"%s", "hostaddr": "%s"}\n'\
'}\n'
# cut longer msgs
MAXMSG = 1024
def makePickle(self, record):
"""Create message in JSON format."""
# get & cut msg
msg = self.format(record)
if len(msg) > self.MAXMSG:
msg = msg[:self.MAXMSG]
txt_level = self._level_map.get(record.levelno, "ERROR")
hostname = socket.gethostname()
try:
hostaddr = socket.gethostbyname(hostname)
except:
hostaddr = "0.0.0.0"
jobname = record.name
svcname = _service_name
pkt = self._log_template % (time.time()*1000, txt_level, quote_json(msg),
jobname, svcname, hostname, hostaddr)
return pkt
def send(self, s):
"""Disable socket caching."""
sock = self.makeSocket()
sock.sendto(s, (self.host, self.port))
sock.close()
class LogDBHandler(logging.handlers.SocketHandler):
"""Sends log records into PostgreSQL server.
Additionally, does some statistics aggregating,
to avoid overloading log server.
It subclasses SocketHandler to get throtthling for
failed connections.
"""
# map codes to string
_level_map = {
logging.DEBUG : 'DEBUG',
logging.INFO : 'INFO',
logging.WARNING : 'WARNING',
logging.ERROR : 'ERROR',
logging.CRITICAL: 'FATAL',
}
def __init__(self, connect_string):
"""
Initializes the handler with a specific connection string.
"""
logging.handlers.SocketHandler.__init__(self, None, None)
self.closeOnError = 1
self.connect_string = connect_string
self.stat_cache = {}
self.stat_flush_period = 60
# send first stat line immidiately
self.last_stat_flush = 0
def createSocket(self):
try:
logging.handlers.SocketHandler.createSocket(self)
except:
self.sock = self.makeSocket()
def makeSocket(self):
"""Create server connection.
In this case its not socket but database connection."""
db = connect_database(self.connect_string)
db.set_isolation_level(0) # autocommit
return db
def emit(self, record):
"""Process log record."""
# we do not want log debug messages
if record.levelno < logging.INFO:
return
try:
self.process_rec(record)
except (SystemExit, KeyboardInterrupt):
raise
except:
self.handleError(record)
def process_rec(self, record):
"""Aggregate stats if needed, and send to logdb."""
# render msg
msg = self.format(record)
# dont want to send stats too ofter
if record.levelno == logging.INFO and msg and msg[0] == "{":
self.aggregate_stats(msg)
if time.time() - self.last_stat_flush >= self.stat_flush_period:
self.flush_stats(record.name)
return
if record.levelno < logging.INFO:
self.flush_stats(record.name)
# dont send more than one line
ln = msg.find('\n')
if ln > 0:
msg = msg[:ln]
txt_level = self._level_map.get(record.levelno, "ERROR")
self.send_to_logdb(record.name, txt_level, msg)
def aggregate_stats(self, msg):
"""Sum stats together, to lessen load on logdb."""
msg = msg[1:-1]
for rec in msg.split(", "):
k, v = rec.split(": ")
agg = self.stat_cache.get(k, 0)
if v.find('.') >= 0:
agg += float(v)
else:
agg += int(v)
self.stat_cache[k] = agg
def flush_stats(self, service):
"""Send awuired stats to logdb."""
res = []
for k, v in self.stat_cache.items():
res.append("%s: %s" % (k, str(v)))
if len(res) > 0:
logmsg = "{%s}" % ", ".join(res)
self.send_to_logdb(service, "INFO", logmsg)
self.stat_cache = {}
self.last_stat_flush = time.time()
def send_to_logdb(self, service, type, msg):
"""Actual sending is done here."""
if self.sock is None:
self.createSocket()
if self.sock:
logcur = self.sock.cursor()
query = "select * from log.add(%s, %s, %s)"
logcur.execute(query, [type, service, msg])
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