## debug.py
##
## Copyright (C) 2003 Jacob Lundqvist
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published
## by the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## This program 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 Lesser General Public License for more details.
_version_ = '1.4.0'
"""\
Generic debug class
Other modules can always define extra debug flags for local usage, as long as
they make sure they append them to debug_flags
Also its always a good thing to prefix local flags with something, to reduce risk
of coliding flags. Nothing breaks if two flags would be identical, but it might
activate unintended debugging.
flags can be numeric, but that makes analysing harder, on creation its
not obvious what is activated, and when flag_show is given, output isnt
really meaningfull.
This Debug class can either be initialized and used on app level, or used independantly
by the individual classes.
For samples of usage, see samples subdir in distro source, and selftest
in this code
"""
import sys
import traceback
import time
import os
import types
if os.environ.has_key('TERM'):
colors_enabled=True
else:
colors_enabled=False
color_none = chr(27) + "[0m"
color_black = chr(27) + "[30m"
color_red = chr(27) + "[31m"
color_green = chr(27) + "[32m"
color_brown = chr(27) + "[33m"
color_blue = chr(27) + "[34m"
color_magenta = chr(27) + "[35m"
color_cyan = chr(27) + "[36m"
color_light_gray = chr(27) + "[37m"
color_dark_gray = chr(27) + "[30;1m"
color_bright_red = chr(27) + "[31;1m"
color_bright_green = chr(27) + "[32;1m"
color_yellow = chr(27) + "[33;1m"
color_bright_blue = chr(27) + "[34;1m"
color_purple = chr(27) + "[35;1m"
color_bright_cyan = chr(27) + "[36;1m"
color_white = chr(27) + "[37;1m"
"""
Define your flags in yor modules like this:
from debug import *
DBG_INIT = 'init' ; debug_flags.append( DBG_INIT )
DBG_CONNECTION = 'connection' ; debug_flags.append( DBG_CONNECTION )
The reason for having a double statement wis so we can validate params
and catch all undefined debug flags
This gives us control over all used flags, and makes it easier to allow
global debugging in your code, just do something like
foo = Debug( debug_flags )
group flags, that is a flag in it self containing multiple flags should be
defined without the debug_flags.append() sequence, since the parts are already
in the list, also they must of course be defined after the flags they depend on ;)
example:
DBG_MULTI = [ DBG_INIT, DBG_CONNECTION ]
NoDebug
-------
To speed code up, typically for product releases or such
use this class instead if you globaly want to disable debugging
"""
class NoDebug:
def __init__( self, *args, **kwargs ):
self.debug_flags = []
def show( self, *args, **kwargs):
pass
def Show( self, *args, **kwargs):
pass
def is_active( self, flag ):
pass
colors={}
def active_set( self, active_flags = None ):
return 0
LINE_FEED = '\n'
class Debug:
def __init__( self,
#
# active_flags are those that will trigger output
#
active_flags = None,
#
# Log file should be file object or file namne
#
log_file = sys.stderr,
#
# prefix and sufix can either be set globaly or per call.
# personally I use this to color code debug statements
# with prefix = chr(27) + '[34m'
# sufix = chr(27) + '[37;1m\n'
#
prefix = 'DEBUG: ',
sufix = '\n',
#
# If you want unix style timestamps,
# 0 disables timestamps
# 1 before prefix, good when prefix is a string
# 2 after prefix, good when prefix is a color
#
time_stamp = 0,
#
# flag_show should normaly be of, but can be turned on to get a
# good view of what flags are actually used for calls,
# if it is not None, it should be a string
# flags for current call will be displayed
# with flag_show as separator
# recomended values vould be '-' or ':', but any string goes
#
flag_show = None,
#
# If you dont want to validate flags on each call to
# show(), set this to 0
#
validate_flags = 1,
#
# If you dont want the welcome message, set to 0
# default is to show welcome if any flags are active
welcome = -1
):
self.debug_flags = []
if welcome == -1:
if active_flags and len(active_flags):
welcome = 1
else:
welcome = 0
self._remove_dupe_flags()
if log_file:
if type( log_file ) is type(''):
try:
self._fh = open(log_file,'w')
except:
print 'ERROR: can open %s for writing'
sys.exit(0)
else: ## assume its a stream type object
self._fh = log_file
else:
self._fh = sys.stdout
if time_stamp not in (0,1,2):
msg2 = '%s' % time_stamp
raise 'Invalid time_stamp param', msg2
self.prefix = prefix
self.sufix = sufix
self.time_stamp = time_stamp
self.flag_show = None # must be initialised after possible welcome
self.validate_flags = validate_flags
self.active_set( active_flags )
if welcome:
self.show('')
caller = sys._getframe(1) # used to get name of caller
try:
mod_name= ":%s" % caller.f_locals['__name__']
except:
mod_name = ""
self.show('Debug created for %s%s' % (caller.f_code.co_filename,
mod_name ))
self.show(' flags defined: %s' % ','.join( self.active ))
if type(flag_show) in (type(''), type(None)):
self.flag_show = flag_show
else:
msg2 = '%s' % type(flag_show )
raise 'Invalid type for flag_show!', msg2
def show( self, msg, flag = None, prefix = None, sufix = None,
lf = 0 ):
"""
flag can be of folowing types:
None - this msg will always be shown if any debugging is on
flag - will be shown if flag is active
(flag1,flag2,,,) - will be shown if any of the given flags
are active
if prefix / sufix are not given, default ones from init will be used
lf = -1 means strip linefeed if pressent
lf = 1 means add linefeed if not pressent
"""
if self.validate_flags:
self._validate_flag( flag )
if not self.is_active(flag):
return
if prefix:
pre = prefix
else:
pre = self.prefix
if sufix:
suf = sufix
else:
suf = self.sufix
if self.time_stamp == 2:
output = '%s%s ' % ( pre,
time.strftime('%b %d %H:%M:%S',
time.localtime(time.time() )),
)
elif self.time_stamp == 1:
output = '%s %s' % ( time.strftime('%b %d %H:%M:%S',
time.localtime(time.time() )),
pre,
)
else:
output = pre
if self.flag_show:
if flag:
output = '%s%s%s' % ( output, flag, self.flag_show )
else:
# this call uses the global default,
# dont print "None", just show the separator
output = '%s %s' % ( output, self.flag_show )
output = '%s%s%s' % ( output, msg, suf )
if lf:
# strip/add lf if needed
last_char = output[-1]
if lf == 1 and last_char != LINE_FEED:
output = output + LINE_FEED
elif lf == -1 and last_char == LINE_FEED:
output = output[:-1]
try:
self._fh.write( output )
except:
# unicode strikes again ;)
s=u''
for i in range(len(output)):
if ord(output[i]) < 128:
c = output[i]
else:
c = '?'
s=s+c
self._fh.write( '%s%s%s' % ( pre, s, suf ))
self._fh.flush()
def is_active( self, flag ):
'If given flag(s) should generate output.'
# try to abort early to quicken code
if not self.active:
return 0
if not flag or flag in self.active:
return 1
else:
# check for multi flag type:
if type( flag ) in ( type(()), type([]) ):
for s in flag:
if s in self.active:
return 1
return 0
def active_set( self, active_flags = None ):
"returns 1 if any flags where actually set, otherwise 0."
r = 0
ok_flags = []
if not active_flags:
#no debuging at all
self.active = []
elif type( active_flags ) in ( types.TupleType, types.ListType ):
flags = self._as_one_list( active_flags )
for t in flags:
if t not in self.debug_flags:
sys.stderr.write('Invalid debugflag given: %s\n' % t )
ok_flags.append( t )
self.active = ok_flags
r = 1
else:
# assume comma string
try:
flags = active_flags.split(',')
except:
self.show( '***' )
self.show( '*** Invalid debug param given: %s' % active_flags )
self.show( '*** please correct your param!' )
self.show( '*** due to this, full debuging is enabled' )
self.active = self.debug_flags
for f in flags:
s = f.strip()
ok_flags.append( s )
self.active = ok_flags
self._remove_dupe_flags()
return r
def active_get( self ):
"returns currently active flags."
return self.active
def _as_one_list( self, items ):
""" init param might contain nested lists, typically from group flags.
This code organises lst and remves dupes
"""
if type( items ) <> type( [] ) and type( items ) <> type( () ):
return [ items ]
r = []
for l in items:
if type( l ) == type([]):
lst2 = self._as_one_list( l )
for l2 in lst2:
self._append_unique_str(r, l2 )
elif l == None:
continue
else:
self._append_unique_str(r, l )
return r
def _append_unique_str( self, lst, item ):
"""filter out any dupes."""
if type(item) <> type(''):
msg2 = '%s' % item
raise 'Invalid item type (should be string)',msg2
if item not in lst:
lst.append( item )
return lst
def _validate_flag( self, flags ):
'verify that flag is defined.'
if flags:
for f in self._as_one_list( flags ):
if not f in self.debug_flags:
msg2 = '%s' % f
raise 'Invalid debugflag given', msg2
def _remove_dupe_flags( self ):
"""
if multiple instances of Debug is used in same app,
some flags might be created multiple time, filter out dupes
"""
unique_flags = []
for f in self.debug_flags:
if f not in unique_flags:
unique_flags.append(f)
self.debug_flags = unique_flags
colors={}
def Show(self, flag, msg, prefix=''):
msg=msg.replace('\r','\\r').replace('\n','\\n').replace('><','>\n <')
if not colors_enabled: pass
elif self.colors.has_key(prefix): msg=self.colors[prefix]+msg+color_none
else: msg=color_none+msg
if not colors_enabled: prefixcolor=''
elif self.colors.has_key(flag): prefixcolor=self.colors[flag]
else: prefixcolor=color_none
if prefix=='error':
_exception = sys.exc_info()
if _exception[0]:
msg=msg+'\n'+''.join(traceback.format_exception(_exception[0], _exception[1], _exception[2])).rstrip()
prefix= self.prefix+prefixcolor+(flag+' '*12)[:12]+' '+(prefix+' '*6)[:6]
self.show(msg, flag, prefix)
def is_active( self, flag ):
if not self.active: return 0
if not flag or flag in self.active and DBG_ALWAYS not in self.active or flag not in self.active and DBG_ALWAYS in self.active : return 1
return 0
DBG_ALWAYS='always'
##Uncomment this to effectively disable all debugging and all debugging overhead.
#Debug=NoDebug