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#!/usr/bin/python
#
# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""
Watch live PostgreSQL logs for interesting stuff
"""
import re, sys
from optparse import OptionParser
import subprocess
def get_options(args=None):
parser = OptionParser()
parser.add_option("-l", "--logfile", dest="logfile",
default="/var/log/postgresql/postgres.log",
metavar="LOG", help="Monitor LOG instead of the default"
)
parser.add_option("--slow", dest="slow",
type="float", default=100.0, metavar="TIME",
help="Report slow queries taking over TIME seconds",
)
(options, args) = parser.parse_args(args)
return options
def generate_loglines(logfile):
"""Generator returning the next line in the logfile (blocking)"""
cmd = subprocess.Popen(
['tail', '-f', logfile],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while cmd.poll() is None:
yield cmd.stdout.readline()
if cmd.returncode != 0:
print >> sys.stderr, cmd.stderr.read()
raise RuntimeError("tail returned %d" % cmd.returncode)
class Process(object):
statement = None
duration = None
connection = None
auth = None
def __init__(self, pid):
self.pid = pid
class Watcher(object):
_line_re = re.compile("""
^\d{4}-\d\d-\d\d \s \d\d:\d\d:\d\d \s
\[(?P<pid>\d+)\] \s (?P<type>LOG|ERROR|DETAIL): \s+ (?P<rest>.*)$
""", re.X)
_statement_re = re.compile("""
^statement: \s (?P<statement>.*)$
""", re.X)
_duration_re = re.compile("""
^duration: \s (?P<duration>\d+\.\d+) \s ms$
""", re.X)
_connection_received_re = re.compile("""
^connection \s received: \s+ (?P<connection>.*)$
""", re.X)
_connection_authorized_re = re.compile("""
^connection \s authorized: \s+ (?P<auth>.*)$
""", re.X)
_ignored_rest_re = re.compile("""
^(received \s | ERROR: \s | unexpected \s EOF \s) .*$
""", re.X)
_ignored_statements_re = re.compile("""
^(BEGIN.*|END)$
""", re.X)
def __init__(self, options):
self.processes = {}
self.options = options
self.previous_process = None
def run(self):
lines = generate_loglines(options.logfile)
for line in lines:
self.feed(line)
def feed(self, line):
# Handle continuations of previous statement
if line.startswith('\t'):
if self.previous_process is not None:
self.previous_process.statement += '\n%s' % line[1:-1]
return
match = self._line_re.search(line)
if match is None:
raise ValueError('Badly formatted line %r' % (line,))
t = match.group('type')
if t in ['ERROR', 'DETAIL']:
return
if t != 'LOG':
raise ValueError('Unknown line type %s (%r)' % (t, line))
pid = int(match.group('pid'))
rest = match.group('rest')
process = self.processes.get(pid, None)
if process is None:
process = Process(pid)
self.processes[pid] = process
self.previous_process = process
match = self._statement_re.search(rest)
if match is not None:
statement = match.group('statement')
if process.statement:
process.statement += '\n%s' % statement
else:
process.statement = statement
return
match = self._duration_re.search(rest)
if match is not None:
process.duration = float(match.group('duration'))
self.reportDuration(process)
self.previous_process = None
del self.processes[process.pid]
return
match = self._connection_received_re.search(rest)
if match is not None:
process.connection = match.group('connection')
return
match = self._connection_authorized_re.search(rest)
if match is not None:
process.auth = match.group('auth')
return
match = self._ignored_rest_re.search(rest)
if match is not None:
return
raise ValueError('Unknown entry: %r' % (rest,))
def reportDuration(self, process):
"""Report a slow statement if it is above a threshold"""
if self.options.slow is None or process.statement is None:
return
match = self._ignored_statements_re.search(process.statement)
if match is not None:
return
if process.duration > options.slow:
print '[%5d] %s' % (process.pid, process.statement)
print ' Duration: %0.3f' % (process.duration,)
if __name__ == '__main__':
options = get_options()
watcher = Watcher(options)
try:
watcher.run()
except KeyboardInterrupt:
pass
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