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Update comment about reentrance on cassette.py

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This commit is contained in:
Ivan Malison
2015-08-18 16:16:49 -07:00
parent 1e414826e7
commit bd7c6ed03f
1 changed files with 21 additions and 8 deletions
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29
vcr/cassette.py
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@@ -20,10 +20,18 @@ class CassetteContextDecorator(object):
"""Context manager/decorator that handles installing the cassette and
removing cassettes.
This class defers the creation of a new cassette instance until the point at
which it is installed by context manager or decorator. The fact that a new
cassette is used with each application prevents the state of any cassette
from interfering with another.
This class defers the creation of a new cassette instance until
the point at which it is installed by context manager or
decorator. The fact that a new cassette is used with each
application prevents the state of any cassette from interfering
with another.
Instances of this class are NOT reentrant as context managers.
However, functions that are decorated by
``CassetteContextDecorator`` instances ARE reentrant. See the
implementation of ``__call__`` on this class for more details.
There is also a guard against attempts to reenter instances of
this class as a context manager in ``__exit__``.
"""
_non_cassette_arguments = ('path_transformer', 'func_path_generator')
@@ -39,9 +47,12 @@ class CassetteContextDecorator(object):
def _patch_generator(self, cassette):
with contextlib.ExitStack() as exit_stack:
for patcher in CassettePatcherBuilder(cassette).build():
exit_stack.enter_context(patcher)
log.debug('Entered context for cassette at {0}.'.format(cassette._path))
for patcher in CassettePatcherBuilder(cassette).build:
exit_stack.enter_contextpatcher
log_format = '{action} context for cassette at {path}.'
log.debug(log_format.format(
cassette._path
))
yield cassette
log.debug('Exiting context for cassette at {0}.'.format(cassette._path))
# TODO(@IvanMalison): Hmmm. it kind of feels like this should be
@@ -78,7 +89,9 @@ class CassetteContextDecorator(object):
# functions are reentrant. This is required for thread
# safety and the correct operation of recursive functions.
args_getter = self._build_args_getter_for_decorator(function)
return type(self)(self.cls, args_getter)._execute_function(function, args, kwargs)
return type(self)(self.cls, args_getter)._execute_function(
function, args, kwargs
)
def _execute_function(self, function, args, kwargs):
if inspect.isgeneratorfunction(function):