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logger.py
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Sat, Oct 5, 15:19
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R3600 invenio-infoscience
logger.py
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# -*- coding: utf-8 -*-
## This file is part of Invenio.
## Copyright (C) 2013, 2014 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 02111-1307, USA.
""" Logging part of workflows module."""
import
logging
def
get_logger
(
logger_name
,
db_handler_obj
,
level
=
10
,
**
kwargs
):
"""
Initialize and return a Python logger object.
You can specifiy the handlers to output logs in sys.stderr as well as the
datebase or anything you want.
"""
logging
.
basicConfig
(
level
=
level
)
# Get a basic logger object
logger
=
logging
.
getLogger
(
logger_name
)
if
not
logger
.
handlers
:
# Create formatter and add it to the handlers
formatter
=
logging
.
Formatter
(
'
%(levelname)s
%(asctime)s
%(name)s
%(message)s
'
)
db_handler_obj
.
setFormatter
(
formatter
)
db_handler_obj
.
setLevel
(
level
)
logger
.
addHandler
(
db_handler_obj
)
stream_handler
=
logging
.
StreamHandler
()
stream_handler
.
setFormatter
(
formatter
)
stream_handler
.
setLevel
(
level
)
logger
.
addHandler
(
stream_handler
)
# Let's not propagate to root logger..
logger
.
propagate
=
0
# FIXME: loglevels are simply overwritten somewhere in Celery
# even if Celery is not being "used".
#
# This means log.DEBUG is NOT working at the moment!
logger
.
setLevel
(
level
)
# Add any kwargs to extra parameter and return logger
wrapped_logger
=
BibWorkflowLogAdapter
(
logger
,
kwargs
)
return
wrapped_logger
class
BibWorkflowLogHandler
(
logging
.
Handler
,
object
):
"""Implements a handler for logging to database."""
def
__init__
(
self
,
model
,
id_name
):
"""Instanciate a BibWorkflowLogHandler object."""
super
(
BibWorkflowLogHandler
,
self
)
.
__init__
()
self
.
model
=
model
self
.
id_name
=
id_name
def
emit
(
self
,
record
):
""" Create the log object in database."""
from
invenio.ext.sqlalchemy
import
db
log_obj
=
self
.
model
(
id_object
=
getattr
(
record
.
obj
,
self
.
id_name
),
log_type
=
record
.
levelno
,
message
=
record
.
msg
)
db
.
session
.
add
(
log_obj
)
db
.
session
.
commit
()
class
BibWorkflowLogAdapter
(
logging
.
LoggerAdapter
):
"""
BibWorkflowLogAdapter class.
This example adapter expects the passed in dict-like object to have a
'obj' key, whose value in brackets is used during logging.
"""
def
process
(
self
,
msg
,
kwargs
):
""" Save kwargs in extra."""
kwargs
[
'extra'
]
=
self
.
extra
return
msg
,
kwargs
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