def test_meta_kernel_finder():
kf = discovery.KernelFinder(providers=[DummyKernelProvider()])
assert list(kf.find_kernels()) == \
[('dummy/sample', {'argv': ['dummy_kernel']})]
conn_info, manager = kf.launch('dummy/sample')
assert isinstance(manager, DummyKernelManager)
async def test_kernel_launch_params(caplog, setup_test):
kf = discovery.KernelFinder(providers=[LaunchParamsKernelProvider()])
kspecs = list(kf.find_kernels())
count = 0
param_spec = None
for name, spec in kspecs:
if name == 'params_kspec/params_kspec':
param_spec = spec
count += 1
assert count == 1
assert param_spec['argv'] == [
'tail', '{follow}', '-n {line_count}', '{connection_file}'
]
# application gathers launch parameters here... Since this is full schema, application will likely
# just access: param_spec['metadata']['launch_parameter_schema']
#
line_count_schema = param_spec['metadata']['launch_parameter_schema'][
'properties']['line_count']
follow_schema = param_spec['metadata']['launch_parameter_schema'][
'properties']['follow']
cpus_schema = param_spec['metadata']['launch_parameter_schema'][
'properties']['cpus']
memory_schema = param_spec['metadata']['launch_parameter_schema'][
'properties']['memory']
# validate we have our metadata
assert line_count_schema['minimum'] == 1
assert follow_schema['default'] == '-f'
assert cpus_schema['maximum'] == 8.0
assert memory_schema[
'description'] == "The number of GB to reserve for memory for this kernel"
# Kernel provider would be responsible for validating values against the schema upon return from client.
# This includes setting any default values for parameters that were not included, etc. The following
# simulates the parameter gathering...
launch_params = dict()
launch_params['follow'] = follow_schema['enum'][0]
launch_params['line_count'] = 8
launch_params['cpus'] = cpus_schema['default']
# add a "system-owned" parameter - connection_file - ensure this value is NOT substituted.
launch_params['connection_file'] = 'bad_param'
# capture DEBUG output in order to confirm argv substitutions
with caplog.at_level(logging.DEBUG):
conn_info, manager = await kf.launch('params_kspec/params_kspec',
launch_params=launch_params)
assert isinstance(manager, KernelManager)
assert "Starting kernel cmd: ['tail', '-f', '-n 8'," in caplog.text
# this actually starts a tail -f command, so let's make sure its terminated
await manager.kill()
await manager.cleanup()
def test_reinstantiate():
# If the kernel fails, a new manager should be instantiated
kf = discovery.KernelFinder(providers=[DummyKernelProvider()])
_, manager = kf.launch('dummy/sample')
manager.kill()
restarter = KernelRestarterBase(manager, 'dummy/sample', kernel_finder=kf)
assert restarter.kernel_manager is manager
restarter.poll()
assert restarter.kernel_manager is not manager
assert restarter.kernel_manager.is_alive()
async def test_kernel_spec_provider_subclass(setup_test):
kf = discovery.KernelFinder(providers=[DummyKernelSpecProvider()])
dummy_kspecs = list(kf.find_kernels())
assert len(dummy_kspecs) == 2
for name, spec in dummy_kspecs:
assert name.startswith('dummy_kspec/dummy_kspec')
assert spec['argv'] == ['cat', '{connection_file}']
conn_info, manager = await kf.launch('dummy_kspec/dummy_kspec1')
assert isinstance(manager, DummyKernelManager)
await manager.kill(
) # no process was started, so this is only for completeness
async def test_load_config(setup_test):
# create fake application
app = ProviderApplication()
app.launch_instance(argv=["--ProviderConfig.my_argv=['xxx','yyy']"])
kf = discovery.KernelFinder(providers=[TestConfigKernelProvider()])
dummy_kspecs = list(kf.find_kernels())
count = 0
found_argv = []
for name, spec in dummy_kspecs:
if name == 'config/sample':
found_argv = spec['argv']
count += 1
assert count == 1
assert found_argv == ['xxx', 'yyy']
def test_relaunch():
# If the kernel fails after the first poll, its manager's relaunch() method
# should be called.
kf = discovery.KernelFinder(providers=[DummyKernelProvider()])
manager = kf.launch('dummy/sample')
relaunch_count = [0]
def relaunch():
relaunch_count[0] += 1
manager.relaunch = relaunch
restarter = KernelRestarterBase(manager, 'dummy/sample', kernel_finder=kf)
restarter.poll()
assert relaunch_count[0] == 0
# Kernel dies after first poll
manager.kill()
restarter.poll()
assert relaunch_count[0] == 1
assert restarter.kernel_manager is manager
async def test_kernel_spec_provider(setup_test):
kf = discovery.KernelFinder(providers=[discovery.KernelSpecProvider()])
dummy_kspecs = list(kf.find_kernels())
count = 0
found_argv = []
for name, spec in dummy_kspecs:
if name == 'spec/sample':
found_argv = spec['argv']
count += 1
assert count == 1
assert found_argv == ['cat', '{connection_file}']
with pytest.raises(kernelspec.NoSuchKernel):
await kf.launch('spec/dummy_kspec1')
conn_info, manager = await kf.launch('spec/sample')
assert isinstance(manager, KernelManager)
# this actually starts a kernel, so let's make sure its terminated
await manager.kill()
await manager.cleanup()