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"""
tests for multi channels and gateway Groups
"""
from __future__ import annotations
import gc
from time import sleep
from typing import Callable
import execnet
import pytest
from execnet import XSpec
from execnet.gateway import Gateway
from execnet.gateway_base import Channel
from execnet.gateway_base import ExecModel
from execnet.multi import Group
from execnet.multi import safe_terminate
class TestMultiChannelAndGateway:
def test_multichannel_container_basics(
self, gw: Gateway, execmodel: ExecModel
) -> None:
mch = execnet.MultiChannel([Channel(gw, i) for i in range(3)])
assert len(mch) == 3
channels = list(mch)
assert len(channels) == 3
# ordering
for i in range(3):
assert channels[i].id == i
assert channels[i] == mch[i]
assert channels[0] in mch
assert channels[1] in mch
assert channels[2] in mch
def test_multichannel_receive_each(self) -> None:
class pseudochannel:
def receive(self) -> object:
return 12
pc1 = pseudochannel()
pc2 = pseudochannel()
multichannel = execnet.MultiChannel([pc1, pc2]) # type: ignore[list-item]
l = multichannel.receive_each(withchannel=True)
assert len(l) == 2
assert l == [(pc1, 12), (pc2, 12)] # type: ignore[comparison-overlap]
l2 = multichannel.receive_each(withchannel=False)
assert l2 == [12, 12]
def test_multichannel_send_each(self) -> None:
gm = execnet.Group(["popen"] * 2)
mc = gm.remote_exec(
"""
import os
channel.send(channel.receive() + 1)
"""
)
mc.send_each(41)
l = mc.receive_each()
assert l == [42, 42]
def test_Group_execmodel_setting(self) -> None:
gm = execnet.Group()
gm.set_execmodel("thread")
assert gm.execmodel.backend == "thread"
assert gm.remote_execmodel.backend == "thread"
gm._gateways.append(1) # type: ignore[arg-type]
try:
with pytest.raises(ValueError):
gm.set_execmodel("eventlet")
assert gm.execmodel.backend == "thread"
finally:
gm._gateways.pop()
def test_multichannel_receive_queue_for_two_subprocesses(self) -> None:
gm = execnet.Group(["popen"] * 2)
mc = gm.remote_exec(
"""
import os
channel.send(os.getpid())
"""
)
queue = mc.make_receive_queue()
ch, item = queue.get(timeout=10)
ch2, item2 = queue.get(timeout=10)
assert ch != ch2
assert ch.gateway != ch2.gateway
assert item != item2
mc.waitclose()
def test_multichannel_waitclose(self) -> None:
l = []
class pseudochannel:
def waitclose(self) -> None:
l.append(0)
multichannel = execnet.MultiChannel([pseudochannel(), pseudochannel()]) # type: ignore[list-item]
multichannel.waitclose()
assert len(l) == 2
class TestGroup:
def test_basic_group(self, monkeypatch: pytest.MonkeyPatch) -> None:
import atexit
atexitlist: list[Callable[[], object]] = []
monkeypatch.setattr(atexit, "register", atexitlist.append)
group = Group()
assert atexitlist == [group._cleanup_atexit]
exitlist = []
joinlist = []
class PseudoIO:
def wait(self) -> None:
pass
class PseudoSpec:
via = None
class PseudoGW:
id = "9999"
_io = PseudoIO()
spec = PseudoSpec()
def exit(self) -> None:
exitlist.append(self)
group._unregister(self) # type: ignore[arg-type]
def join(self) -> None:
joinlist.append(self)
gw = PseudoGW()
group._register(gw) # type: ignore[arg-type]
assert len(exitlist) == 0
assert len(joinlist) == 0
group._cleanup_atexit()
assert len(exitlist) == 1
assert exitlist == [gw]
assert len(joinlist) == 1
assert joinlist == [gw]
group._cleanup_atexit()
assert len(exitlist) == 1
assert len(joinlist) == 1
def test_group_default_spec(self) -> None:
group = Group()
group.defaultspec = "not-existing-type"
pytest.raises(ValueError, group.makegateway)
def test_group_PopenGateway(self) -> None:
group = Group()
gw = group.makegateway("popen")
assert list(group) == [gw]
assert group[0] == gw
assert len(group) == 1
group._cleanup_atexit()
assert not group._gateways
def test_group_ordering_and_termination(self) -> None:
group = Group()
group.makegateway("popen//id=3")
group.makegateway("popen//id=2")
group.makegateway("popen//id=5")
gwlist = list(group)
assert len(gwlist) == 3
idlist = [x.id for x in gwlist]
assert idlist == list("325")
print(group)
group.terminate()
print(group)
assert not group
assert repr(group) == "<Group []>"
def test_group_id_allocation(self) -> None:
group = Group()
specs = [XSpec("popen"), XSpec("popen//id=hello")]
group.allocate_id(specs[0])
group.allocate_id(specs[1])
gw = group.makegateway(specs[1])
assert gw.id == "hello"
gw = group.makegateway(specs[0])
assert gw.id == "gw0"
# pytest.raises(ValueError,
# group.allocate_id, XSpec("popen//id=hello"))
group.terminate()
def test_gateway_and_id(self) -> None:
group = Group()
gw = group.makegateway("popen//id=hello")
assert group["hello"] == gw
with pytest.raises((TypeError, AttributeError)):
del group["hello"] # type: ignore[attr-defined]
with pytest.raises((TypeError, AttributeError)):
group["hello"] = 5 # type: ignore[index]
assert "hello" in group
assert gw in group
assert len(group) == 1
gw.exit()
assert "hello" not in group
with pytest.raises(KeyError):
_ = group["hello"]
def test_default_group(self) -> None:
oldlist = list(execnet.default_group)
gw = execnet.makegateway("popen")
try:
newlist = list(execnet.default_group)
assert len(newlist) == len(oldlist) + 1
assert gw in newlist
assert gw not in oldlist
finally:
gw.exit()
def test_remote_exec_args(self) -> None:
group = Group()
group.makegateway("popen")
def fun(channel, arg) -> None:
channel.send(arg)
mch = group.remote_exec(fun, arg=1)
result = mch.receive_each()
assert result == [1]
def test_terminate_with_proxying(self) -> None:
group = Group()
group.makegateway("popen//id=master")
group.makegateway("popen//via=master//id=worker")
group.terminate(1.0)
@pytest.mark.xfail(reason="active_count() has been broken for some time")
def test_safe_terminate(execmodel: ExecModel) -> None:
if execmodel.backend not in ("thread", "main_thread_only"):
pytest.xfail(
"execution model %r does not support task count" % execmodel.backend
)
import threading
active = threading.active_count()
l = []
def term() -> None:
sleep(3)
def kill() -> None:
l.append(1)
safe_terminate(execmodel, 1, [(term, kill)] * 10)
assert len(l) == 10
sleep(0.1)
gc.collect()
assert execmodel.active_count() == active # type: ignore[attr-defined]
@pytest.mark.xfail(reason="active_count() has been broken for some time")
def test_safe_terminate2(execmodel: ExecModel) -> None:
if execmodel.backend not in ("thread", "main_thread_only"):
pytest.xfail(
"execution model %r does not support task count" % execmodel.backend
)
import threading
active = threading.active_count()
l = []
def term() -> None:
return
def kill() -> None:
l.append(1)
safe_terminate(execmodel, 3, [(term, kill)] * 10)
assert len(l) == 0
sleep(0.1)
gc.collect()
assert threading.active_count() == active
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