How to send N-EVENT-REPORT to Storage SCU Emulator?

[honghw79]

Hello,
Sorry, my English is bad. And Python beginner.

I want to make simple Storage SCP. And I want it to support Storage Commitment.
I am testing use Storage SCU Emulator of DVTK.
After sending the image, send a Storage Commit to Storage SCP from the Storage SCU Emulator.
my Storage SCP show this error message...
I don't know why...
I test DVTK Storage SCP Emulator and DVTK Storage SCU Emulator working very well. no problem...

Thanks.

E: No presentation context for 'Storage Commitment Push Model SOP Instance' has been accepted by the peer for the SCU role
Traceback (most recent call last):
  File "D:\Documents\Project\storageSCP\venv\Lib\site-packages\pynetdicom\service_class.py", line 570, in _n_action_scp
    user_response = evt.trigger(
                    ^^^^^^^^^^^^
  File "D:\Documents\Project\storageSCP\venv\Lib\site-packages\pynetdicom\events.py", line 387, in trigger
    return handlers[0](evt)
           ^^^^^^^^^^^^^^^^
  File "D:\Documents\Project\storageSCP\commitment.py", line 40, in handle_action
    send_event_report(event.assoc, sop_instance_uid)
  File "D:\Documents\Project\storageSCP\commitment.py", line 22, in send_event_report
    status = assoc.send_n_event_report(event_info, event_type=1, class_uid=StorageCommitmentPushModelInstance,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Documents\Project\storageSCP\venv\Lib\site-packages\pynetdicom\association.py", line 2860, in send_n_event_report
    context = self._get_valid_context(meta_uid or class_uid, "", None)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Documents\Project\storageSCP\venv\Lib\site-packages\pynetdicom\association.py", line 496, in _get_valid_context
    raise ValueError(msg)

This is my test code...

from pynetdicom import AE, evt, StorageCommitmentPresentationContexts, AllStoragePresentationContexts, debug_logger
from pynetdicom.sop_class import StorageCommitmentPushModelInstance
from pydicom.dataset import Dataset

debug_logger()


def send_event_report(assoc, sop_instance_uid):
    event_info = Dataset()
    event_info.SOPInstanceUID = sop_instance_uid
    event_info.ReferencedSOPInstanceUID = sop_instance_uid
    event_info.EventTypeID = 1

    status = assoc.send_n_event_report(event_info, event_type=1, class_uid=StorageCommitmentPushModelInstance,
                                       instance_uid=sop_instance_uid, msg_id=1, )
    print(f"N-EVENT-REPORT Send Status : {status}")

def handle_action(event):
    action_information = event.action_information
    sop_instance_uid = action_information.ReferencedSOPSequence[0].ReferencedSOPInstanceUID
    print(f"Received N-ACTION for SOP Instance UID: {sop_instance_uid}")

    send_event_report(event.assoc, sop_instance_uid)

    return 0x0000

def handle_store(event):
   # Now it is not save image. Just send successful message.
    print("Received image...")
    return 0x0000

ae = AE()

ae.supported_contexts = StorageCommitmentPresentationContexts
ae.supported_contexts = AllStoragePresentationContexts

handlers = [(evt.EVT_N_ACTION, handle_action),
            (evt.EVT_C_STORE, handle_store)
            ]

ae.start_server(('', 104), block=True, evt_handlers=handlers)

[scaramallion]

This is the problem:

ae.supported_contexts = StorageCommitmentPresentationContexts
ae.supported_contexts = AllStoragePresentationContexts

This is overwriting the storage commitment contexts using the storage context, not appending to them, hence the error message:

E: No presentation context for 'Storage Commitment Push Model SOP Instance' has been accepted by the peer for the SCU role