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tractor/tests/test_rpc.py

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"""
RPC related
"""
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import itertools
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import pytest
import tractor
import trio
async def sleep_back_actor(
actor_name,
func_name,
func_defined,
exposed_mods,
):
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if actor_name:
async with tractor.find_actor(actor_name) as portal:
try:
await portal.run(__name__, func_name)
except tractor.RemoteActorError as err:
if not func_defined:
expect = AttributeError
if not exposed_mods:
expect = tractor.ModuleNotExposed
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assert err.type is expect
raise
else:
await trio.sleep(float('inf'))
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async def short_sleep():
await trio.sleep(0)
@pytest.mark.parametrize(
'to_call', [
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([], 'short_sleep', tractor.RemoteActorError),
([__name__], 'short_sleep', tractor.RemoteActorError),
([__name__], 'fake_func', tractor.RemoteActorError),
(['tmp_mod'], 'import doggy', ModuleNotFoundError),
(['tmp_mod'], '4doggy', SyntaxError),
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],
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ids=['no_mods', 'this_mod', 'this_mod_bad_func', 'fail_to_import',
'fail_on_syntax'],
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)
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def test_rpc_errors(arb_addr, to_call, testdir):
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"""Test errors when making various RPC requests to an actor
that either doesn't have the requested module exposed or doesn't define
the named function.
"""
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exposed_mods, funcname, inside_err = to_call
subactor_exposed_mods = []
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func_defined = globals().get(funcname, False)
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subactor_requests_to = 'arbiter'
remote_err = tractor.RemoteActorError
# remote module that fails at import time
if exposed_mods == ['tmp_mod']:
# create an importable module with a bad import
testdir.syspathinsert()
# module should raise a ModuleNotFoundError at import
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testdir.makefile('.py', tmp_mod=funcname)
# no need to expose module to the subactor
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subactor_exposed_mods = exposed_mods
exposed_mods = []
func_defined = False
# subactor should not try to invoke anything
subactor_requests_to = None
# the module will be attempted to be imported locally but will
# fail in the initial local instance of the actor
remote_err = inside_err
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async def main():
actor = tractor.current_actor()
assert actor.is_arbiter
# spawn a subactor which calls us back
async with tractor.open_nursery() as n:
await n.run_in_actor(
'subactor',
sleep_back_actor,
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actor_name=subactor_requests_to,
# function from the local exposed module space
# the subactor will invoke when it RPCs back to this actor
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func_name=funcname,
exposed_mods=exposed_mods,
func_defined=True if func_defined else False,
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rpc_module_paths=subactor_exposed_mods,
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)
def run():
tractor.run(
main,
arbiter_addr=arb_addr,
rpc_module_paths=exposed_mods.copy(),
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)
# handle both parameterized cases
if exposed_mods and func_defined:
run()
else:
# underlying errors aren't propagated upwards (yet)
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with pytest.raises(remote_err) as err:
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run()
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# get raw instance from pytest wrapper
value = err.value
# might get multiple `trio.Cancelled`s as well inside an inception
if isinstance(value, trio.MultiError):
value = next(itertools.dropwhile(
lambda exc: not isinstance(exc, tractor.RemoteActorError),
value.exceptions
))
if getattr(value, 'type', None):
assert value.type is inside_err