Source

django / django / utils / dictconfig.py

  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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
# This is a copy of the Python logging.config.dictconfig module,
# reproduced with permission. It is provided here for backwards
# compatibility for Python versions prior to 2.7.
#
# Copyright 2009-2010 by Vinay Sajip. All Rights Reserved.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and that
# both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of Vinay Sajip
# not be used in advertising or publicity pertaining to distribution
# of the software without specific, written prior permission.
# VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
# IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import logging.handlers
import re
import sys
import types

IDENTIFIER = re.compile('^[a-z_][a-z0-9_]*$', re.I)

def valid_ident(s):
    m = IDENTIFIER.match(s)
    if not m:
        raise ValueError('Not a valid Python identifier: %r' % s)
    return True

#
# This function is defined in logging only in recent versions of Python
#
try:
    from logging import _checkLevel
except ImportError:
    def _checkLevel(level):
        if isinstance(level, int):
            rv = level
        elif str(level) == level:
            if level not in logging._levelNames:
                raise ValueError('Unknown level: %r' % level)
            rv = logging._levelNames[level]
        else:
            raise TypeError('Level not an integer or a '
                            'valid string: %r' % level)
        return rv

# The ConvertingXXX classes are wrappers around standard Python containers,
# and they serve to convert any suitable values in the container. The
# conversion converts base dicts, lists and tuples to their wrapped
# equivalents, whereas strings which match a conversion format are converted
# appropriately.
#
# Each wrapper should have a configurator attribute holding the actual
# configurator to use for conversion.

class ConvertingDict(dict):
    """A converting dictionary wrapper."""

    def __getitem__(self, key):
        value = dict.__getitem__(self, key)
        result = self.configurator.convert(value)
        #If the converted value is different, save for next time
        if value is not result:
            self[key] = result
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
                result.key = key
        return result

    def get(self, key, default=None):
        value = dict.get(self, key, default)
        result = self.configurator.convert(value)
        #If the converted value is different, save for next time
        if value is not result:
            self[key] = result
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
                result.key = key
        return result

    def pop(self, key, default=None):
        value = dict.pop(self, key, default)
        result = self.configurator.convert(value)
        if value is not result:
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
                result.key = key
        return result

class ConvertingList(list):
    """A converting list wrapper."""
    def __getitem__(self, key):
        value = list.__getitem__(self, key)
        result = self.configurator.convert(value)
        #If the converted value is different, save for next time
        if value is not result:
            self[key] = result
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
                result.key = key
        return result

    def pop(self, idx=-1):
        value = list.pop(self, idx)
        result = self.configurator.convert(value)
        if value is not result:
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
        return result

class ConvertingTuple(tuple):
    """A converting tuple wrapper."""
    def __getitem__(self, key):
        value = tuple.__getitem__(self, key)
        result = self.configurator.convert(value)
        if value is not result:
            if type(result) in (ConvertingDict, ConvertingList,
                                ConvertingTuple):
                result.parent = self
                result.key = key
        return result

class BaseConfigurator(object):
    """
    The configurator base class which defines some useful defaults.
    """

    CONVERT_PATTERN = re.compile(r'^(?P<prefix>[a-z]+)://(?P<suffix>.*)$')

    WORD_PATTERN = re.compile(r'^\s*(\w+)\s*')
    DOT_PATTERN = re.compile(r'^\.\s*(\w+)\s*')
    INDEX_PATTERN = re.compile(r'^\[\s*(\w+)\s*\]\s*')
    DIGIT_PATTERN = re.compile(r'^\d+$')

    value_converters = {
        'ext' : 'ext_convert',
        'cfg' : 'cfg_convert',
    }

    # We might want to use a different one, e.g. importlib
    importer = __import__

    def __init__(self, config):
        self.config = ConvertingDict(config)
        self.config.configurator = self

    def resolve(self, s):
        """
        Resolve strings to objects using standard import and attribute
        syntax.
        """
        name = s.split('.')
        used = name.pop(0)
        try:
            found = self.importer(used)
            for frag in name:
                used += '.' + frag
                try:
                    found = getattr(found, frag)
                except AttributeError:
                    self.importer(used)
                    found = getattr(found, frag)
            return found
        except ImportError:
            e, tb = sys.exc_info()[1:]
            v = ValueError('Cannot resolve %r: %s' % (s, e))
            v.__cause__, v.__traceback__ = e, tb
            raise v

    def ext_convert(self, value):
        """Default converter for the ext:// protocol."""
        return self.resolve(value)

    def cfg_convert(self, value):
        """Default converter for the cfg:// protocol."""
        rest = value
        m = self.WORD_PATTERN.match(rest)
        if m is None:
            raise ValueError("Unable to convert %r" % value)
        else:
            rest = rest[m.end():]
            d = self.config[m.groups()[0]]
            #print d, rest
            while rest:
                m = self.DOT_PATTERN.match(rest)
                if m:
                    d = d[m.groups()[0]]
                else:
                    m = self.INDEX_PATTERN.match(rest)
                    if m:
                        idx = m.groups()[0]
                        if not self.DIGIT_PATTERN.match(idx):
                            d = d[idx]
                        else:
                            try:
                                n = int(idx) # try as number first (most likely)
                                d = d[n]
                            except TypeError:
                                d = d[idx]
                if m:
                    rest = rest[m.end():]
                else:
                    raise ValueError('Unable to convert '
                                     '%r at %r' % (value, rest))
        #rest should be empty
        return d

    def convert(self, value):
        """
        Convert values to an appropriate type. dicts, lists and tuples are
        replaced by their converting alternatives. Strings are checked to
        see if they have a conversion format and are converted if they do.
        """
        if not isinstance(value, ConvertingDict) and isinstance(value, dict):
            value = ConvertingDict(value)
            value.configurator = self
        elif not isinstance(value, ConvertingList) and isinstance(value, list):
            value = ConvertingList(value)
            value.configurator = self
        elif not isinstance(value, ConvertingTuple) and\
                 isinstance(value, tuple):
            value = ConvertingTuple(value)
            value.configurator = self
        elif isinstance(value, basestring): # str for py3k
            m = self.CONVERT_PATTERN.match(value)
            if m:
                d = m.groupdict()
                prefix = d['prefix']
                converter = self.value_converters.get(prefix, None)
                if converter:
                    suffix = d['suffix']
                    converter = getattr(self, converter)
                    value = converter(suffix)
        return value

    def configure_custom(self, config):
        """Configure an object with a user-supplied factory."""
        c = config.pop('()')
        if not hasattr(c, '__call__') and (not hasattr(types, 'ClassType') or type(c) != types.ClassType):
            c = self.resolve(c)
        props = config.pop('.', None)
        # Check for valid identifiers
        kwargs = dict([(k, config[k]) for k in config if valid_ident(k)])
        result = c(**kwargs)
        if props:
            for name, value in props.items():
                setattr(result, name, value)
        return result

    def as_tuple(self, value):
        """Utility function which converts lists to tuples."""
        if isinstance(value, list):
            value = tuple(value)
        return value

class DictConfigurator(BaseConfigurator):
    """
    Configure logging using a dictionary-like object to describe the
    configuration.
    """

    def configure(self):
        """Do the configuration."""

        config = self.config
        if 'version' not in config:
            raise ValueError("dictionary doesn't specify a version")
        if config['version'] != 1:
            raise ValueError("Unsupported version: %s" % config['version'])
        incremental = config.pop('incremental', False)
        EMPTY_DICT = {}
        logging._acquireLock()
        try:
            if incremental:
                handlers = config.get('handlers', EMPTY_DICT)
                # incremental handler config only if handler name
                # ties in to logging._handlers (Python 2.7)
                if sys.version_info[:2] == (2, 7):
                    for name in handlers:
                        if name not in logging._handlers:
                            raise ValueError('No handler found with '
                                             'name %r'  % name)
                        else:
                            try:
                                handler = logging._handlers[name]
                                handler_config = handlers[name]
                                level = handler_config.get('level', None)
                                if level:
                                    handler.setLevel(_checkLevel(level))
                            except StandardError, e:
                                raise ValueError('Unable to configure handler '
                                                 '%r: %s' % (name, e))
                loggers = config.get('loggers', EMPTY_DICT)
                for name in loggers:
                    try:
                        self.configure_logger(name, loggers[name], True)
                    except StandardError, e:
                        raise ValueError('Unable to configure logger '
                                         '%r: %s' % (name, e))
                root = config.get('root', None)
                if root:
                    try:
                        self.configure_root(root, True)
                    except StandardError, e:
                        raise ValueError('Unable to configure root '
                                         'logger: %s' % e)
            else:
                disable_existing = config.pop('disable_existing_loggers', True)

                logging._handlers.clear()
                del logging._handlerList[:]

                # Do formatters first - they don't refer to anything else
                formatters = config.get('formatters', EMPTY_DICT)
                for name in formatters:
                    try:
                        formatters[name] = self.configure_formatter(
                                                            formatters[name])
                    except StandardError, e:
                        raise ValueError('Unable to configure '
                                         'formatter %r: %s' % (name, e))
                # Next, do filters - they don't refer to anything else, either
                filters = config.get('filters', EMPTY_DICT)
                for name in filters:
                    try:
                        filters[name] = self.configure_filter(filters[name])
                    except StandardError, e:
                        raise ValueError('Unable to configure '
                                         'filter %r: %s' % (name, e))

                # Next, do handlers - they refer to formatters and filters
                # As handlers can refer to other handlers, sort the keys
                # to allow a deterministic order of configuration
                handlers = config.get('handlers', EMPTY_DICT)
                for name in sorted(handlers):
                    try:
                        handler = self.configure_handler(handlers[name])
                        handler.name = name
                        handlers[name] = handler
                    except StandardError, e:
                        raise ValueError('Unable to configure handler '
                                         '%r: %s' % (name, e))
                # Next, do loggers - they refer to handlers and filters

                #we don't want to lose the existing loggers,
                #since other threads may have pointers to them.
                #existing is set to contain all existing loggers,
                #and as we go through the new configuration we
                #remove any which are configured. At the end,
                #what's left in existing is the set of loggers
                #which were in the previous configuration but
                #which are not in the new configuration.
                root = logging.root
                existing = root.manager.loggerDict.keys()
                #The list needs to be sorted so that we can
                #avoid disabling child loggers of explicitly
                #named loggers. With a sorted list it is easier
                #to find the child loggers.
                existing.sort()
                #We'll keep the list of existing loggers
                #which are children of named loggers here...
                child_loggers = []
                #now set up the new ones...
                loggers = config.get('loggers', EMPTY_DICT)
                for name in loggers:
                    if name in existing:
                        i = existing.index(name)
                        prefixed = name + "."
                        pflen = len(prefixed)
                        num_existing = len(existing)
                        i = i + 1 # look at the entry after name
                        while (i < num_existing) and\
                              (existing[i][:pflen] == prefixed):
                            child_loggers.append(existing[i])
                            i = i + 1
                        existing.remove(name)
                    try:
                        self.configure_logger(name, loggers[name])
                    except StandardError, e:
                        raise ValueError('Unable to configure logger '
                                         '%r: %s' % (name, e))

                #Disable any old loggers. There's no point deleting
                #them as other threads may continue to hold references
                #and by disabling them, you stop them doing any logging.
                #However, don't disable children of named loggers, as that's
                #probably not what was intended by the user.
                for log in existing:
                    logger = root.manager.loggerDict[log]
                    if log in child_loggers:
                        logger.level = logging.NOTSET
                        logger.handlers = []
                        logger.propagate = True
                    elif disable_existing:
                        logger.disabled = True

                # And finally, do the root logger
                root = config.get('root', None)
                if root:
                    try:
                        self.configure_root(root)
                    except StandardError, e:
                        raise ValueError('Unable to configure root '
                                         'logger: %s' % e)
        finally:
            logging._releaseLock()

    def configure_formatter(self, config):
        """Configure a formatter from a dictionary."""
        if '()' in config:
            factory = config['()'] # for use in exception handler
            try:
                result = self.configure_custom(config)
            except TypeError, te:
                if "'format'" not in str(te):
                    raise
                #Name of parameter changed from fmt to format.
                #Retry with old name.
                #This is so that code can be used with older Python versions
                #(e.g. by Django)
                config['fmt'] = config.pop('format')
                config['()'] = factory
                result = self.configure_custom(config)
        else:
            fmt = config.get('format', None)
            dfmt = config.get('datefmt', None)
            result = logging.Formatter(fmt, dfmt)
        return result

    def configure_filter(self, config):
        """Configure a filter from a dictionary."""
        if '()' in config:
            result = self.configure_custom(config)
        else:
            name = config.get('name', '')
            result = logging.Filter(name)
        return result

    def add_filters(self, filterer, filters):
        """Add filters to a filterer from a list of names."""
        for f in filters:
            try:
                filterer.addFilter(self.config['filters'][f])
            except StandardError, e:
                raise ValueError('Unable to add filter %r: %s' % (f, e))

    def configure_handler(self, config):
        """Configure a handler from a dictionary."""
        formatter = config.pop('formatter', None)
        if formatter:
            try:
                formatter = self.config['formatters'][formatter]
            except StandardError, e:
                raise ValueError('Unable to set formatter '
                                 '%r: %s' % (formatter, e))
        level = config.pop('level', None)
        filters = config.pop('filters', None)
        if '()' in config:
            c = config.pop('()')
            if not hasattr(c, '__call__') and (not hasattr(types, 'ClassType') or type(c) != types.ClassType):
                c = self.resolve(c)
            factory = c
        else:
            klass = self.resolve(config.pop('class'))
            #Special case for handler which refers to another handler
            if issubclass(klass, logging.handlers.MemoryHandler) and\
                'target' in config:
                try:
                    config['target'] = self.config['handlers'][config['target']]
                except StandardError, e:
                    raise ValueError('Unable to set target handler '
                                     '%r: %s' % (config['target'], e))
            elif issubclass(klass, logging.handlers.SMTPHandler) and\
                'mailhost' in config:
                config['mailhost'] = self.as_tuple(config['mailhost'])
            elif issubclass(klass, logging.handlers.SysLogHandler) and\
                'address' in config:
                config['address'] = self.as_tuple(config['address'])
            factory = klass
        kwargs = dict([(k, config[k]) for k in config if valid_ident(k)])
        try:
            result = factory(**kwargs)
        except TypeError, te:
            if "'stream'" not in str(te):
                raise
            #The argument name changed from strm to stream
            #Retry with old name.
            #This is so that code can be used with older Python versions
            #(e.g. by Django)
            kwargs['strm'] = kwargs.pop('stream')
            result = factory(**kwargs)
        if formatter:
            result.setFormatter(formatter)
        if level is not None:
            result.setLevel(_checkLevel(level))
        if filters:
            self.add_filters(result, filters)
        return result

    def add_handlers(self, logger, handlers):
        """Add handlers to a logger from a list of names."""
        for h in handlers:
            try:
                logger.addHandler(self.config['handlers'][h])
            except StandardError, e:
                raise ValueError('Unable to add handler %r: %s' % (h, e))

    def common_logger_config(self, logger, config, incremental=False):
        """
        Perform configuration which is common to root and non-root loggers.
        """
        level = config.get('level', None)
        if level is not None:
            logger.setLevel(_checkLevel(level))
        if not incremental:
            #Remove any existing handlers
            for h in logger.handlers[:]:
                logger.removeHandler(h)
            handlers = config.get('handlers', None)
            if handlers:
                self.add_handlers(logger, handlers)
            filters = config.get('filters', None)
            if filters:
                self.add_filters(logger, filters)

    def configure_logger(self, name, config, incremental=False):
        """Configure a non-root logger from a dictionary."""
        logger = logging.getLogger(name)
        self.common_logger_config(logger, config, incremental)
        propagate = config.get('propagate', None)
        if propagate is not None:
            logger.propagate = propagate

    def configure_root(self, config, incremental=False):
        """Configure a root logger from a dictionary."""
        root = logging.getLogger()
        self.common_logger_config(root, config, incremental)

dictConfigClass = DictConfigurator

def dictConfig(config):
    """Configure logging using a dictionary."""
    dictConfigClass(config).configure()
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.