Repository navigation
Expand file tree
/
Copy pathlog.py
More file actions
176 lines (136 loc) · 5.94 KB
/
Copy pathlog.py
File metadata and controls
176 lines (136 loc) · 5.94 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
"Logging functions for Mininet."
import logging
from logging import Logger
import types
# Create a new loglevel, 'CLI info', which enables a Mininet user to see only
# the output of the commands they execute, plus any errors or warnings. This
# level is in between info and warning. CLI info-level commands should not be
# printed during regression tests.
OUTPUT = 25
LEVELS = { 'debug': logging.DEBUG,
'info': logging.INFO,
'output': OUTPUT,
'warning': logging.WARNING,
'error': logging.ERROR,
'critical': logging.CRITICAL }
# change this to logging.INFO to get printouts when running unit tests
LOGLEVELDEFAULT = OUTPUT
#default: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
LOGMSGFORMAT = '%(message)s'
# Modified from python2.5/__init__.py
class StreamHandlerNoNewline( logging.StreamHandler ):
"""StreamHandler that doesn't print newlines by default.
Since StreamHandler automatically adds newlines, define a mod to more
easily support interactive mode when we want it, or errors-only logging
for running unit tests."""
def emit( self, record ):
"""Emit a record.
If a formatter is specified, it is used to format the record.
The record is then written to the stream with a trailing newline
[ N.B. this may be removed depending on feedback ]. If exception
information is present, it is formatted using
traceback.printException and appended to the stream."""
try:
msg = self.format( record )
fs = '%s' # was '%s\n'
if not hasattr( types, 'UnicodeType' ): # if no unicode support...
self.stream.write( fs % msg )
else:
try:
self.stream.write( fs % msg )
except UnicodeError:
self.stream.write( fs % msg.encode( 'UTF-8' ) )
self.flush()
except ( KeyboardInterrupt, SystemExit ):
raise
except:
self.handleError( record )
class Singleton( type ):
"""Singleton pattern from Wikipedia
See http://en.wikipedia.org/wiki/Singleton_Pattern
Intended to be used as a __metaclass_ param, as shown for the class
below."""
def __init__( cls, name, bases, dict_ ):
super( Singleton, cls ).__init__( name, bases, dict_ )
cls.instance = None
def __call__( cls, *args, **kw ):
if cls.instance is None:
cls.instance = super( Singleton, cls ).__call__( *args, **kw )
return cls.instance
class MininetLogger( Logger, object ):
"""Mininet-specific logger
Enable each mininet .py file to with one import:
from mininet.log import [lg, info, error]
...get a default logger that doesn't require one newline per logging
call.
Inherit from object to ensure that we have at least one new-style base
class, and can then use the __metaclass__ directive, to prevent this
error:
TypeError: Error when calling the metaclass bases
a new-style class can't have only classic bases
If Python2.5/logging/__init__.py defined Filterer as a new-style class,
via Filterer( object ): rather than Filterer, we wouldn't need this.
Use singleton pattern to ensure only one logger is ever created."""
__metaclass__ = Singleton
def __init__( self ):
Logger.__init__( self, "mininet" )
# create console handler
ch = StreamHandlerNoNewline()
# create formatter
formatter = logging.Formatter( LOGMSGFORMAT )
# add formatter to ch
ch.setFormatter( formatter )
# add ch to lg
self.addHandler( ch )
self.setLogLevel()
def setLogLevel( self, levelname=None ):
"""Setup loglevel.
Convenience function to support lowercase names.
levelName: level name from LEVELS"""
level = LOGLEVELDEFAULT
if levelname is not None:
if levelname not in LEVELS:
raise Exception( 'unknown levelname seen in setLogLevel' )
else:
level = LEVELS.get( levelname, level )
self.setLevel( level )
self.handlers[ 0 ].setLevel( level )
# pylint: disable=method-hidden
# "An attribute inherited from mininet.log hide this method" (sic)
# Not sure why this is occurring - this function definitely gets called.
# See /usr/lib/python2.5/logging/__init__.py; modified from warning()
def output( self, msg, *args, **kwargs ):
"""Log 'msg % args' with severity 'OUTPUT'.
To pass exception information, use the keyword argument exc_info
with a true value, e.g.
logger.warning("Houston, we have a %s", "cli output", exc_info=1)
"""
if self.manager.disable >= OUTPUT:
return
if self.isEnabledFor( OUTPUT ):
self._log( OUTPUT, msg, args, kwargs )
# pylint: enable=method-hidden
lg = MininetLogger()
# Make things a bit more convenient by adding aliases
# (info, warn, error, debug) and allowing info( 'this', 'is', 'OK' )
# In the future we may wish to make things more efficient by only
# doing the join (and calling the function) unless the logging level
# is high enough.
def makeListCompatible( fn ):
"""Return a new function allowing fn( 'a 1 b' ) to be called as
newfn( 'a', 1, 'b' )"""
def newfn( *args ):
"Generated function. Closure-ish."
if len( args ) == 1:
return fn( *args )
args = ' '.join( [ str( arg ) for arg in args ] )
return fn( args )
# Fix newfn's name and docstring
setattr( newfn, '__name__', fn.__name__ )
setattr( newfn, '__doc__', fn.__doc__ )
return newfn
info, output, warn, error, debug = (
lg.info, lg.output, lg.warn, lg.error, lg.debug ) = [
makeListCompatible( f ) for f in
lg.info, lg.output, lg.warn, lg.error, lg.debug ]
setLogLevel = lg.setLogLevel