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"""
basic logging functionality based on a producer/consumer scheme.
XXX implement this API: (maybe put it into slogger.py?)
log = Logger(
info=py.log.STDOUT,
debug=py.log.STDOUT,
command=None)
log.info("hello", "world")
log.command("hello", "world")
log = Logger(info=Logger(something=...),
debug=py.log.STDOUT,
command=None)
"""
import py, sys
class Message(object):
def __init__(self, keywords, args):
self.keywords = keywords
self.args = args
def content(self):
return " ".join(map(str, self.args))
def prefix(self):
return "[%s] " % (":".join(self.keywords))
def __str__(self):
return self.prefix() + self.content()
class Producer(object):
""" (deprecated) Log producer API which sends messages to be logged
to a 'consumer' object, which then prints them to stdout,
stderr, files, etc. Used extensively by PyPy-1.1.
"""
Message = Message # to allow later customization
keywords2consumer = {}
def __init__(self, keywords, keywordmapper=None, **kw):
if hasattr(keywords, 'split'):
keywords = tuple(keywords.split())
self._keywords = keywords
if keywordmapper is None:
keywordmapper = default_keywordmapper
self._keywordmapper = keywordmapper
def __repr__(self):
return "<py.log.Producer %s>" % ":".join(self._keywords)
def __getattr__(self, name):
if '_' in name:
raise AttributeError(name)
producer = self.__class__(self._keywords + (name,))
setattr(self, name, producer)
return producer
def __call__(self, *args):
""" write a message to the appropriate consumer(s) """
func = self._keywordmapper.getconsumer(self._keywords)
if func is not None:
func(self.Message(self._keywords, args))
class KeywordMapper:
def __init__(self):
self.keywords2consumer = {}
def getstate(self):
return self.keywords2consumer.copy()
def setstate(self, state):
self.keywords2consumer.clear()
self.keywords2consumer.update(state)
def getconsumer(self, keywords):
""" return a consumer matching the given keywords.
tries to find the most suitable consumer by walking, starting from
the back, the list of keywords, the first consumer matching a
keyword is returned (falling back to py.log.default)
"""
for i in range(len(keywords), 0, -1):
try:
return self.keywords2consumer[keywords[:i]]
except KeyError:
continue
return self.keywords2consumer.get('default', default_consumer)
def setconsumer(self, keywords, consumer):
""" set a consumer for a set of keywords. """
# normalize to tuples
if isinstance(keywords, str):
keywords = tuple(filter(None, keywords.split()))
elif hasattr(keywords, '_keywords'):
keywords = keywords._keywords
elif not isinstance(keywords, tuple):
raise TypeError("key %r is not a string or tuple" % (keywords,))
if consumer is not None and not py.builtin.callable(consumer):
if not hasattr(consumer, 'write'):
raise TypeError(
"%r should be None, callable or file-like" % (consumer,))
consumer = File(consumer)
self.keywords2consumer[keywords] = consumer
def default_consumer(msg):
""" the default consumer, prints the message to stdout (using 'print') """
sys.stderr.write(str(msg)+"\n")
default_keywordmapper = KeywordMapper()
def setconsumer(keywords, consumer):
default_keywordmapper.setconsumer(keywords, consumer)
def setstate(state):
default_keywordmapper.setstate(state)
def getstate():
return default_keywordmapper.getstate()
#
# Consumers
#
class File(object):
""" log consumer wrapping a file(-like) object """
def __init__(self, f):
assert hasattr(f, 'write')
#assert isinstance(f, file) or not hasattr(f, 'open')
self._file = f
def __call__(self, msg):
""" write a message to the log """
self._file.write(str(msg) + "\n")
if hasattr(self._file, 'flush'):
self._file.flush()
class Path(object):
""" log consumer that opens and writes to a Path """
def __init__(self, filename, append=False,
delayed_create=False, buffering=False):
self._append = append
self._filename = str(filename)
self._buffering = buffering
if not delayed_create:
self._openfile()
def _openfile(self):
mode = self._append and 'a' or 'w'
f = open(self._filename, mode)
self._file = f
def __call__(self, msg):
""" write a message to the log """
if not hasattr(self, "_file"):
self._openfile()
self._file.write(str(msg) + "\n")
if not self._buffering:
self._file.flush()
def STDOUT(msg):
""" consumer that writes to sys.stdout """
sys.stdout.write(str(msg)+"\n")
def STDERR(msg):
""" consumer that writes to sys.stderr """
sys.stderr.write(str(msg)+"\n")
class Syslog:
""" consumer that writes to the syslog daemon """
def __init__(self, priority = None):
if priority is None:
priority = self.LOG_INFO
self.priority = priority
def __call__(self, msg):
""" write a message to the log """
py.std.syslog.syslog(self.priority, str(msg))
for _prio in "EMERG ALERT CRIT ERR WARNING NOTICE INFO DEBUG".split():
_prio = "LOG_" + _prio
try:
setattr(Syslog, _prio, getattr(py.std.syslog, _prio))
except AttributeError:
pass
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