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"""Tests for kernel connection utilities"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
import errno
import json
import os
from tempfile import TemporaryDirectory
from typing import no_type_check
from unittest.mock import patch
import pytest
import zmq
from traitlets.config.loader import Config
from ipykernel import connect
from ipykernel.kernelapp import IPKernelApp
from .utils import TemporaryWorkingDirectory
@pytest.fixture(scope="module", autouse=True)
def _enable_tracemalloc():
try:
import tracemalloc
except ModuleNotFoundError:
# pypy
tracemalloc = None
if tracemalloc is not None:
tracemalloc.start()
yield
if tracemalloc is not None:
tracemalloc.stop()
sample_info: dict = {
"ip": "1.2.3.4",
"transport": "ipc",
"shell_port": 1,
"hb_port": 2,
"iopub_port": 3,
"stdin_port": 4,
"control_port": 5,
"key": b"abc123",
"signature_scheme": "hmac-md5",
}
class DummyKernelApp(IPKernelApp):
def _default_shell_port(self):
return 0
def initialize(self, argv=None):
self.init_profile_dir()
self.init_connection_file()
def test_get_connection_file():
cfg = Config()
with TemporaryWorkingDirectory() as d:
cfg.ProfileDir.location = d
cf = "kernel.json"
app = DummyKernelApp(config=cfg, connection_file=cf)
app.initialize()
profile_cf = os.path.join(app.connection_dir, cf)
assert profile_cf == app.abs_connection_file
with open(profile_cf, "w") as f:
f.write("{}")
assert os.path.exists(profile_cf)
assert connect.get_connection_file(app) == profile_cf
app.connection_file = cf
assert connect.get_connection_file(app) == profile_cf
def test_get_connection_info():
with TemporaryDirectory() as d:
cf = os.path.join(d, "kernel.json")
connect.write_connection_file(cf, **sample_info)
json_info = connect.get_connection_info(cf)
info = connect.get_connection_info(cf, unpack=True)
assert isinstance(json_info, str)
sub_info = {k: v for k, v in info.items() if k in sample_info}
assert sub_info == sample_info
info2 = json.loads(json_info)
info2["key"] = info2["key"].encode("utf-8")
sub_info2 = {k: v for k, v in info.items() if k in sample_info}
assert sub_info2 == sample_info
def test_port_bind_failure_raises(request):
cfg = Config()
with TemporaryWorkingDirectory() as d:
cfg.ProfileDir.location = d
cf = "kernel.json"
app = DummyKernelApp(config=cfg, connection_file=cf)
request.addfinalizer(app.close)
app.initialize()
with patch.object(app, "_try_bind_socket") as mock_try_bind:
mock_try_bind.side_effect = zmq.ZMQError(-100, "fails for unknown error types")
with pytest.raises(zmq.ZMQError):
app.init_sockets()
assert mock_try_bind.call_count == 1
@no_type_check
def test_port_bind_failure_recovery(request):
try:
errno.WSAEADDRINUSE
except AttributeError:
# Fake windows address in-use code
p = patch.object(errno, "WSAEADDRINUSE", 12345, create=True)
p.start()
request.addfinalizer(p.stop)
cfg = Config()
with TemporaryWorkingDirectory() as d:
cfg.ProfileDir.location = d
cf = "kernel.json"
app = DummyKernelApp(config=cfg, connection_file=cf)
request.addfinalizer(app.close)
app.initialize()
with patch.object(app, "_try_bind_socket") as mock_try_bind:
mock_try_bind.side_effect = [
zmq.ZMQError(errno.EADDRINUSE, "fails for non-bind unix"),
zmq.ZMQError(errno.WSAEADDRINUSE, "fails for non-bind windows"),
] + [0] * 100
# Shouldn't raise anything as retries will kick in
app.init_sockets()
def test_port_bind_failure_gives_up_retries(request):
cfg = Config()
with TemporaryWorkingDirectory() as d:
cfg.ProfileDir.location = d
cf = "kernel.json"
app = DummyKernelApp(config=cfg, connection_file=cf)
request.addfinalizer(app.close)
app.initialize()
with patch.object(app, "_try_bind_socket") as mock_try_bind:
mock_try_bind.side_effect = zmq.ZMQError(errno.EADDRINUSE, "fails for non-bind")
with pytest.raises(zmq.ZMQError):
app.init_sockets()
assert mock_try_bind.call_count == 100
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