def start(self) -> None:
"""
Starts the service for this session, ensuring that the
``workstation_image`` is ready to be used and that
``WORKSTATIONS_MAXIMUM_SESSIONS`` has not been reached in this region.
Raises
------
ComponentException
If the service cannot be started.
"""
try:
if not self.workstation_image.ready:
raise ComponentException("Workstation image was not ready")
if (Session.objects.all().filter(
status__in=[Session.RUNNING, Session.STARTED],
region=self.region,
).count() >= settings.WORKSTATIONS_MAXIMUM_SESSIONS):
raise ComponentException("Too many sessions are running")
self.service.start(
http_port=self.workstation_image.http_port,
websocket_port=self.workstation_image.websocket_port,
hostname=self.hostname,
environment=self.environment,
)
self.update_status(status=self.STARTED)
except Exception:
self.update_status(status=self.FAILED)
raise
def _create_file_result(self, reader, job):
output_file = Path(self.output_path)
try:
file = get_file(container=reader, src=output_file)
except NotFound:
raise ComponentException(
f"The evaluation or algorithm failed for an unknown reason as "
f"file {self.output_path} was not produced. Please contact the "
f"organisers for assistance.")
if self.save_in_object_store:
civ = ComponentInterfaceValue.objects.create(interface=self)
try:
civ.file = File(file, name=str(output_file.name))
civ.full_clean()
civ.save()
except ValidationError:
raise ComponentException("Invalid filetype.")
else:
try:
result = json.loads(
file.read().decode(),
parse_constant=lambda x: None, # Removes -inf, inf and NaN
)
except JSONDecodeError as e:
raise ComponentException(
f"Could not decode json file: {e.msg}")
civ = ComponentInterfaceValue.objects.create(interface=self,
value=result)
job.outputs.add(civ)
def _create_json_result(self, reader, job):
try:
result = get_file(container=reader, src=Path(self.output_path))
except NotFound:
# The container exited without error, but no results file was
# produced. This shouldn't happen, but does with poorly programmed
# evaluation containers.
raise ComponentException(
"The evaluation failed for an unknown reason as no results "
"file was produced. Please contact the organisers for "
"assistance."
)
try:
result = json.loads(
result.read().decode(),
parse_constant=lambda x: None, # Removes -inf, inf and NaN
)
except JSONDecodeError as e:
raise ComponentException(f"Could not decode results file: {e.msg}")
civ = ComponentInterfaceValue.objects.create(
interface=self, value=result
)
job.outputs.add(civ)