Viewing file:  DummyTransaction.py (3.2 KB) -rw-r--r--
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'''
Provides dummy Transaction and Response classes is used by Cheetah in place
of real Webware transactions when the Template obj is not used directly as a
Webware servlet.
Warning: This may be deprecated in the future, please do not rely on any
specific DummyTransaction or DummyResponse behavior
'''
import logging
import types
class DummyResponseFailure(Exception):
pass
class DummyResponse(object):
'''
A dummy Response class is used by Cheetah in place of real Webware
Response objects when the Template obj is not used directly as a Webware
servlet
'''
def __init__(self):
self._outputChunks = []
def flush(self):
pass
def safeConvert(self, chunk):
# Exceptionally gross, but the safest way
# I've found to ensure I get a legit unicode object
if not chunk:
return u''
if isinstance(chunk, unicode):
return chunk
try:
return chunk.decode('utf-8', 'strict')
except UnicodeDecodeError:
try:
return chunk.decode('latin-1', 'strict')
except UnicodeDecodeError:
return chunk.decode('ascii', 'ignore')
except AttributeError:
return unicode(chunk, errors='ignore')
return chunk
def write(self, value):
self._outputChunks.append(value)
def writeln(self, txt):
write(txt)
write('\n')
def getvalue(self, outputChunks=None):
chunks = outputChunks or self._outputChunks
try:
return u''.join(chunks)
except UnicodeDecodeError, ex:
logging.debug('Trying to work around a UnicodeDecodeError in getvalue()')
logging.debug('...perhaps you could fix "%s" while you\'re debugging')
return ''.join((self.safeConvert(c) for c in chunks))
def writelines(self, *lines):
## not used
[self.writeln(ln) for ln in lines]
class DummyTransaction(object):
'''
A dummy Transaction class is used by Cheetah in place of real Webware
transactions when the Template obj is not used directly as a Webware
servlet.
It only provides a response object and method. All other methods and
attributes make no sense in this context.
'''
def __init__(self, *args, **kwargs):
self._response = None
def response(self, resp=None):
if self._response is None:
self._response = resp or DummyResponse()
return self._response
class TransformerResponse(DummyResponse):
def __init__(self, *args, **kwargs):
super(TransformerResponse, self).__init__(*args, **kwargs)
self._filter = None
def getvalue(self, **kwargs):
output = super(TransformerResponse, self).getvalue(**kwargs)
if self._filter:
_filter = self._filter
if isinstance(_filter, type):
_filter = _filter()
return _filter.filter(output)
return output
class TransformerTransaction(object):
def __init__(self, *args, **kwargs):
self._response = None
def response(self):
if self._response:
return self._response
return TransformerResponse()
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