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bpo-33786: Fix asynchronous generators to handle GeneratorExit in athrow() #7514

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Merged
merged 1 commit into from
Jun 8, 2018
Merged

bpo-33786: Fix asynchronous generators to handle GeneratorExit in athrow() #7514

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56 changes: 56 additions & 0 deletions Lib/test/test_asyncgen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,31 @@ def sync_iterate(g):
res.append(str(type(ex)))
return res

def async_iterate(g):
res = []
while True:
an = g.__anext__()
try:
while True:
try:
an.__next__()
except StopIteration as ex:
if ex.args:
res.append(ex.args[0])
break
else:
res.append('EMPTY StopIteration')
break
except StopAsyncIteration:
raise
except Exception as ex:
res.append(str(type(ex)))
break
except StopAsyncIteration:
res.append('STOP')
break
return res

def async_iterate(g):
res = []
while True:
Expand Down Expand Up @@ -300,6 +325,37 @@ async def gen():
"non-None value .* async generator"):
gen().__anext__().send(100)

def test_async_gen_exception_11(self):
def sync_gen():
yield 10
yield 20

def sync_gen_wrapper():
yield 1
sg = sync_gen()
sg.send(None)
try:
sg.throw(GeneratorExit())
except GeneratorExit:
yield 2
yield 3

async def async_gen():
yield 10
yield 20

async def async_gen_wrapper():
yield 1
asg = async_gen()
await asg.asend(None)
try:
await asg.athrow(GeneratorExit())
except GeneratorExit:
yield 2
yield 3

self.compare_generators(sync_gen_wrapper(), async_gen_wrapper())

def test_async_gen_api_01(self):
async def gen():
yield 123
Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2018-06-06-23-24-40.bpo-33786.lBvT8z.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix asynchronous generators to handle GeneratorExit in athrow() correctly
15 changes: 7 additions & 8 deletions Objects/genobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1939,21 +1939,20 @@ async_gen_athrow_send(PyAsyncGenAThrow *o, PyObject *arg)
return NULL;

check_error:
if (PyErr_ExceptionMatches(PyExc_StopAsyncIteration)) {
if (PyErr_ExceptionMatches(PyExc_StopAsyncIteration) ||
PyErr_ExceptionMatches(PyExc_GeneratorExit))
{
o->agt_state = AWAITABLE_STATE_CLOSED;
if (o->agt_args == NULL) {
/* when aclose() is called we don't want to propagate
StopAsyncIteration; just raise StopIteration, signalling
that 'aclose()' is done. */
StopAsyncIteration or GeneratorExit; just raise
StopIteration, signalling that this 'aclose()' await
is done.
*/
PyErr_Clear();
PyErr_SetNone(PyExc_StopIteration);
}
}
else if (PyErr_ExceptionMatches(PyExc_GeneratorExit)) {
o->agt_state = AWAITABLE_STATE_CLOSED;
PyErr_Clear(); /* ignore these errors */
PyErr_SetNone(PyExc_StopIteration);
}
return NULL;
}

Expand Down