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import unittest.mock
import pytest
from ipykernel.comm import Comm, CommManager
from ipykernel.ipkernel import IPythonKernel
from ipykernel.kernelbase import Kernel
def test_comm(kernel: Kernel) -> None:
manager = CommManager(kernel=kernel)
kernel.comm_manager = manager # type:ignore
with pytest.deprecated_call():
c = Comm(kernel=kernel, target_name="bar")
msgs = []
assert kernel is c.kernel # type:ignore
def on_close(msg):
msgs.append(msg)
def on_message(msg):
msgs.append(msg)
c.publish_msg("foo")
c.open({})
c.on_msg(on_message)
c.on_close(on_close)
c.handle_msg({})
c.handle_close({})
c.close()
assert len(msgs) == 2
assert c.target_name == "bar"
def test_comm_manager(kernel: Kernel) -> None:
manager = CommManager(kernel=kernel)
msgs = []
def foo(comm, msg):
msgs.append(msg)
comm.close()
def fizz(comm, msg):
raise RuntimeError("hi")
def on_close(msg):
msgs.append(msg)
def on_msg(msg):
msgs.append(msg)
manager.register_target("foo", foo)
manager.register_target("fizz", fizz)
kernel.comm_manager = manager # type:ignore
with unittest.mock.patch.object(Comm, "publish_msg") as publish_msg:
with pytest.deprecated_call():
comm = Comm()
comm.on_msg(on_msg)
comm.on_close(on_close)
manager.register_comm(comm)
assert publish_msg.call_count == 1
# make sure that when we don't pass a kernel, the 'default' kernel is taken
Kernel._instance = kernel # type:ignore
assert comm.kernel is kernel # type:ignore
Kernel.clear_instance()
assert manager.get_comm(comm.comm_id) == comm
assert manager.get_comm("foo") is None
msg = dict(content=dict(comm_id=comm.comm_id, target_name="foo"))
manager.comm_open(None, None, msg)
assert len(msgs) == 1
msg["content"]["target_name"] = "bar"
manager.comm_open(None, None, msg)
assert len(msgs) == 1
msg = dict(content=dict(comm_id=comm.comm_id, target_name="fizz"))
manager.comm_open(None, None, msg)
assert len(msgs) == 1
manager.register_comm(comm)
assert manager.get_comm(comm.comm_id) == comm
msg = dict(content=dict(comm_id=comm.comm_id))
manager.comm_msg(None, None, msg)
assert len(msgs) == 2
msg["content"]["comm_id"] = "foo"
manager.comm_msg(None, None, msg)
assert len(msgs) == 2
manager.register_comm(comm)
assert manager.get_comm(comm.comm_id) == comm
msg = dict(content=dict(comm_id=comm.comm_id))
manager.comm_close(None, None, msg)
assert len(msgs) == 3
assert comm._closed
def test_comm_in_manager(ipkernel: IPythonKernel) -> None:
with pytest.deprecated_call():
comm = Comm()
assert comm.comm_id in ipkernel.comm_manager.comms
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