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errorlib.py
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Tue, Jul 23, 01:45

errorlib.py
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# -*- coding: utf-8 -*-
## $Id$
## Comments and reviews for records.
## This file is part of the CERN Document Server Software (CDSware).
## Copyright (C) 2002, 2003, 2004, 2005 CERN.
##
## The CDSware 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.
##
## The CDSware 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 CDSware; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
__lastupdated__ = """FIXME: last updated"""
from config import *
from webcomment import wash_url_argument
import time
import string
import traceback
import sys
import urllib
def get_client_info(req):
"""
Returns a dictionary with client information
@param req: mod_python request
"""
try:
return \
{ 'host' : req.hostname,
'url' : req.unparsed_uri,
'time' : time.strftime("%Y-%m-%d_%H:%M:%S_%z"),
'browser' : req.headers_in.has_key('User-Agent') and req.headers_in['User-Agent'] or "NA",
'client_ip' : req.connection.remote_ip
}
except:
return {}
def get_tracestack():
"""
If an exception has been caught, return the system tracestack or else return tracestack of what is currently in the stack
"""
if traceback.format_tb(sys.exc_info()[2]):
tracestack_pretty = "Traceback: \n%s" % string.join(traceback.format_tb(sys.exc_info()[2]),"\n")
else:
tracestack = traceback.extract_stack()[:-1] #force traceback except for this call
tracestack_pretty = "%sForced traceback (most recent call last)" % (' '*4,)
for trace_tuple in tracestack:
tracestack_pretty += '''
File "%(file)s", line %(line)s, in %(function)s
%(text)s''' % \
{ 'file' : trace_tuple[0],
'line' : trace_tuple[1],
'function' : trace_tuple[2],
'text' : trace_tuple[3] is None and "" or "%s" % trace_tuple[3]
}
return tracestack_pretty
def register_errors(errors_or_warnings_list, file, req=None):
"""
log errors to cdsware.err and warnings to cdsware.wrn
errors will be logged with client information (if req is given) and a tracestack
warnings will be logged with just the warning message
@param errors_or_warnings_list: list of tuples (err_name, err_msg)
err_name = ERR_ + %(module_directory_name)s + _ + %(error_name)s #ALL CAPS
err_name must be stored in file: module_directory_name + _config.py
as the key for dict with name: cfg_ + %(module_directory_name)s + _error_messages
example:
webcomment_config.py contains
cfg_webcomment_error_messages =
{ 'ERR_WEBCOMMENT_INVALID_RECID' : "The record id %s is invalid. Record ids must be %s", ... }
errors_or_warnings_list = [('ERR_WEBCOMMENT_INVALID_RECID', "The record id -3 is invalid. Record ids must be greater than zero"), ....]
use get_msgs_for_code_list to produce the wanted errors_or_warnings_list from the dictionary values
For warnings, same thing except:
err_name can begin with either 'ERR' or 'WRN'
dict name ends with _warning_messages
@param req = mod_python request
@return tuple integer 1 if successfully wrote to file, integer 0 if not
will append another error to errors_list if unsuccessful
"""
client_info_dict = ""
if file == "error":
# call the stack trace now
tracestack_pretty = get_tracestack()
## if req is given, get client info
if req:
client_info_dict = get_client_info(req)
if client_info_dict:
client_info = \
'''URL: http://%(host)s%(url)s
Browser: %(browser)s
Client: %(client_ip)s''' % client_info_dict
else:
client_info = "No client information available"
else:
client_info = "No client information available"
# check arguments
errors_or_warnings_list = wash_url_argument(errors_or_warnings_list, 'list')
file = wash_url_argument(file, 'str')
for etuple in errors_or_warnings_list:
etuple = wash_url_argument(etuple, 'tuple')
# check file arg, if error default to warnings file + add error
if file == 'error':
file = 'err'
elif file == 'warning':
file = 'wrn'
else:
file = 'wrn'
errors_or_warnings_list.append(('ERR_MISCUTIL_BAD_FILE_ARGUMENT_PASSED', "Invalid argument %s was passed") % file)
## update log_errors
file_pwd = logdir + '/cdsware.' + file
errors = ''
for etuple in errors_or_warnings_list:
try:
errors += "%s%s : %s \n " % (' '*4*7+' ', etuple[0], etuple[1])
except:
errors += "%s%s \n " % (' '*4*7+' ', etuple)
if errors:
errors = errors[(4*7+1):-3] # get rid of begining spaces and last '\n'
msg = '''
%(time)s --> %(errors)s%(error_file)s''' % \
{ 'time' : client_info_dict and client_info_dict['time'] or time.strftime("%Y-%m-%d_%H:%M:%S_%z"),
'errors' : errors,
'error_file' : file=='err' and "\n%s%s\n%s\n" % (' '*4, client_info, tracestack_pretty) or ""
}
try:
file_to_write = open(file_pwd, 'a+')
file_to_write.writelines(msg)
file_to_write.close()
return_value = 1
except :
errors_or_warnings_list.append(('ERR_MISCUTIL_WRITE_FAILED', "Unable to write to file '%s'\n" % file_pwd))
return_value = 0
return return_value
def get_msg_associated_to_code(code, file):
"""
Returns formated string of code
@param code: error or warning code
@param file: 'error' or 'warning'
@return tuple (code, formated_message)
"""
module_directory_name = code.split('_')[1].lower()
module_config = module_directory_name + '_config'
module_dict = "cfg_" + module_directory_name + "_%s_messages" % file
module_dict_call = "cdsware." + module_config + '.' + module_dict
try:
import cdsware
err_msg = eval(module_dict_call)[code]
except:
err_msg = "### Error retrieval failure: could not retrieve error msg because of programming error - could not retrieve %s in errors.py/get_msg_associated_to_code" % (module_dict_call + "['" + code + "']")
return (code, err_msg)
def get_msgs_for_code_list(code_list, file):
"""
@param code_list: list of tuples [(err_name, arg1, ..., argN), ...]
err_name = ERR_ + %(module_directory_name)s + _ + %(error_name)s #ALL CAPS
err_name must be stored in file: module_directory_name + _config.py
as the key for dict with name: cfg_ + %(module_directory_name)s + _error_messages
example:
webcomment_config.py contains
cfg_webcomment_error_messages =
{ 'ERR_WEBCOMMENT_INVALID_RECID' : "The record id %s is invalid. Record ids must be %s", ... }
errors_or_warnings_list = [('ERR_WEBCOMMENT_INVALID_RECID', "The record id -3 is invalid. Record ids must be greater than zero"), ....]
use get_msgs_for_code_list to produce the wanted errors_or_warnings_list from the dictionary values
For warnings, same thing except:
err_name can begin with either 'ERR' or 'WRN'
dict name ends with _warning_messages
@return list of tuples of length 2 [('ERR_...', err_msg), ...]
if code_list empty, will return None.
if errors retrieving error messages, will append an error to the list
"""
out = []
if type(code_list) is None:
return None
code_list = wash_url_argument(code_list, 'list')
file = wash_url_argument(file, 'str')
for code_tuple in code_list:
code_tuple = wash_url_argument(code_tuple, 'tuple')
nb_tuple_args = len(code_tuple) - 1
err_code = code_tuple[0]
if file=='error' and not err_code.startswith('ERR'):
out.append(('ERR_MISCUTIL_PROGRAMMING_ERROR', "Trying to write a non error message to cdsware.err log"))
continue
elif file=='warning' and not err_code.startswith('ERR') and not err_code.startswith('WRN'):
out.append(('ERR_MISCUTIL_PROGRAMMING_ERROR', "Trying to write a non error message or non warning message to cdsware.wrn log"))
continue
err_msg = get_msg_associated_to_code(err_code, file)[1]
nb_msg_args = err_msg.count('%s')
parsing_error = ""
if err_msg.startswith('###') or nb_msg_args==0: #if error or no %s in err_msg
out.append((err_code, err_msg))
continue
if nb_msg_args == nb_tuple_args:
err_msg = err_msg % code_tuple[1:]
elif nb_msg_args < nb_tuple_args:
err_msg = err_msg % code_tuple[1:nb_msg_args+1]
parsing_error = " Programming error: Too many arguments given for error %s " % code_tuple[0]
elif nb_msg_args > nb_tuple_args:
code_tuple = list(code_tuple)
for i in range(nb_msg_args - nb_tuple_args):
code_tuple.append('???')
code_tuple = tuple(code_tuple)
err_msg = err_msg % code_tuple[1:]
parsing_error = " Programming error: Too few arguments given for error %s " % code_tuple[0]
out.append((err_code, err_msg))
if parsing_error:
out.append(('ERR_MISUTIL_PROGRAMMING_ERROR', parsing_error))
if not out:
out = None
return out
def send_error_report_to_admin(header, url, time, browser, client, error, sys_error, traceback):
"""
Sends an email to the admin with client info and tracestack
"""
from_addr = 'CDS Alert Engine <%s>' % alertengineemail
to_addr = adminemail
body = '''
The following error was seen by a user and sent to you.
%(contact)s
%(header)s
%(url)s
%(time)s
%(broser)s
%(client)s
%(error)s
%(sys_error)s
%(traceback)s
Please see the %(logdir)s/errors.log for traceback details.
''' % \
{ 'header' : header,
'url' : url,
'time' : time,
'broser' : browser,
'client' : client,
'error' : error,
'sys_error' : sys_error,
'traceback' : traceback,
'logdir' : logdir,
'contact' : "Please contact %s quoting the following information:" % (supportemail,) #! is support email always cds?
}
from alert_engine import send_email
send_email(from_addr, to_addr, body)

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