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trafficlog.py
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# Copyright (C) 2008-2009 AG Projects. See LICENSE for details
import sys
import datetime
from application import log
class HeaderLogger(object):
"""
>>> l = HeaderLogger()
>>> l.write_data_with_header('11111', '=====\\n')
<BLANKLINE>
=====
11111
>>> l.write_data_with_header('22222', '=====\\n')
<BLANKLINE>
=====
22222
>>> l = HeaderLogger(tell_func = lambda : 1)
>>> l.write_data_with_header('33333', '-----\\n')
<BLANKLINE>
-----
33333
>>> l.write_data_with_header('44444', '-----\\n') # will not print header
44444
>>> l.write_data_with_header('55555', '-----\\n', True)
<BLANKLINE>
-----
55555
"""
def __init__(self, write_func=None, tell_func=None, is_enabled_func=None, prefix=''):
if write_func is not None:
self._write = write_func
if tell_func is not None:
self._tell = tell_func
if is_enabled_func is not None:
self._is_enabled = is_enabled_func
self.prefix = prefix
self.last_header = None
self.last_tell = None
def write_data_with_header(self, msg, header, new_chunk=False):
if new_chunk:
self.last_header = None
if not self._is_enabled():
return
data = ''
if header is not None:
if header != self.last_header or self.last_tell != self._tell():
data += '\n'
data += self.prefix + self.header_prefix() + header + '\n' + self.prefix
msg = msg.replace('\n', '\n' + self.prefix)
data += msg
self._write(data)
self.last_tell = self._tell()
self.last_header = header
def header_prefix(self):
return '%s: ' % (datetime.datetime.now(), )
def _is_enabled(self):
return True
def _tell(self, last_tell=[0]):
last_tell[0]+=1
return last_tell[0]
class HeaderLogger_File(HeaderLogger):
def __init__(self, fileobj=None, is_enabled_func=None, prefix=''):
if fileobj is None:
fileobj=sys.stdout
try:
fileobj.tell()
except IOError:
HeaderLogger.__init__(self, fileobj.write, None, is_enabled_func, prefix=prefix)
else:
HeaderLogger.__init__(self, fileobj.write, fileobj.tell, is_enabled_func, prefix=prefix)
class TrafficLogger(object):
def __init__(self, header_logger):
self.header_logger = header_logger
@classmethod
def to_file(cls, *args, **kwargs):
return cls(HeaderLogger_File(*args, **kwargs))
def report_out(self, data, transport, new_chunk=False):
try:
header = transport._header_out
except AttributeError:
try:
header = transport._header_out = '%s --> %s' % self.format_params(transport)
except Exception, ex:
header = transport._header_out = '<<<%s %s>>>' % (type(ex).__name__, ex)
self.header_logger.write_data_with_header(data.replace('\r\n', '\n'), header, new_chunk)
def report_in(self, data, transport, new_chunk=False):
try:
header = transport._header_in
except AttributeError:
try:
header = transport._header_in = '%s <-- %s' % self.format_params(transport)
except Exception, ex:
header = transport._header_in = '<<<%s %s>>>' % (type(ex).__name__, ex)
self.header_logger.write_data_with_header(data.replace('\r\n', '\n'), header, new_chunk)
def format_params(self, transport):
return (self.format_address(transport.getHost()), self.format_address(transport.getPeer()))
def format_address(self, addr):
return "%s:%s" % (addr.host, addr.port)
class Logger(object):
def __init__(self, prefix='', fileobj=None, is_enabled_func=None):
self.prefix = prefix
if fileobj is not None or is_enabled_func is not None:
self.traffic_logger = TrafficLogger.to_file(fileobj=fileobj, is_enabled_func=is_enabled_func, prefix=prefix)
else:
self.traffic_logger = None
for method in ['msg', 'info', 'debug', 'warn', 'error', 'fatal']:
exec """def %s(self, message, **context): return log.%s(self.prefix + message, **context)""" % (method, method)
def report_out(self, data, transport, new_chunk=False):
if self.traffic_logger:
return self.traffic_logger.report_out(data, transport, new_chunk)
def report_in(self, data, transport, new_chunk=False):
if self.traffic_logger:
return self.traffic_logger.report_in(data, transport, new_chunk)
class FileWithTell(object):
def __init__(self, original):
self.original = original
self.writecount = 0
def __getattr__(self, item):
return getattr(self.original, item)
def write(self, data):
self.writecount += len(data)
return self.original.write(data)
def writelines(self, lines):
self.writecount += sum(map(len, lines))
return self.original.writelines(lines)
def tell(self):
return self.writecount
def hook_std_output():
"add `tell' method to sys.stdout, so that it's usable with HeaderLogger"
sys.stdout = FileWithTell(sys.__stdout__)
def restore_std_output():
sys.stdout = sys.__stdout__
if __name__=='__main__':
import doctest
doctest.testmod()

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