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models.py
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# -*- coding: utf-8 -*-
#
## This file is part of Invenio.
## Copyright (C) 2011, 2012 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02D111-1307, USA.
"""
errorlib database models.
"""
# General imports.
from datetime import datetime
from invenio.base.globals import cfg
from invenio.ext.sqlalchemy import db
# Create your models here.
def _is_pow_of_2(n):
"""
Return True if n is a power of 2
"""
while n > 1:
if n % 2:
return False
n = n / 2
return True
class HstEXCEPTION(db.Model):
"""Represents a HstEXCEPTION record."""
__tablename__ = 'hstEXCEPTION'
id = db.Column(db.Integer(15, unsigned=True), nullable=False,
primary_key=True, autoincrement=True)
name = db.Column(db.String(50), nullable=False)
filename = db.Column(db.String(255), nullable=True)
line = db.Column(db.Integer(9), nullable=True)
last_seen = db.Column(db.DateTime, nullable=False,
server_default='1900-01-01 00:00:00', index=True)
last_notified = db.Column(db.DateTime, nullable=False,
server_default='1900-01-01 00:00:00', index=True)
counter = db.Column(db.Integer(15), nullable=False,
server_default='0')
total = db.Column(db.Integer(15), nullable=False,
server_default='0', index=True)
__table_args__ = (db.Index('name', name, filename, line, unique=True),
db.Model.__table_args__)
@classmethod
def get_or_create(cls, name, filename, line):
"""Finds or create exception log."""
try:
log = cls.query.filter_by(name=name, filename=filename,
line=line).one()
delta = datetime.datetime.now() - log.last_notified
reset_counter = (delta.seconds + delta.days * 86400) >= \
cfg['CFG_ERRORLIB_RESET_EXCEPTION_NOTIFICATION_COUNTER_AFTER']
counter = 1 if reset_counter else log.counter + 1
log.update({'last_notified': db.func.now(),
'counter': counter,
'total': log.total + 1}, synchronize_settion=False)
db.session.add(log)
except:
log = HstEXCEPTION(name=name,
filename=filename,
line=line,
last_seen=db.func.now(),
last_notified=db.func.now(),
counter=1,
total=1)
db.session.add(log)
try:
db.session.commit()
except:
db.session.rollback()
return log
@property
def exception_should_be_notified(self):
return _is_pow_of_2(self.counter)
@property
def pretty_notification_info(self):
return ("This exception has already been seen %s times\n "
"last time it was seen: %s\n "
"last time it was notified: %s\n" % (
self.total,
self.last_seen.strftime("%Y-%m-%d %H:%M:%S"),
self.last_notified.strftime("%Y-%m-%d %H:%M:%S")))
@classmethod
def get_pretty_notification_info(cls, name, filename, line):
"""
Return a sentence describing when this exception was already seen.
"""
try:
return cls.query.filter_by(name=name, filename=filename, line=line).\
one().pretty_notification_info
except:
return "It is the first time this exception has been seen.\n"
__all__ = ['HstEXCEPTION']

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