def handle_move(event, destinations, db_path, cli_config, logger):
"""Handler for evt.EVT_C_MOVE.
Parameters
----------
event : pynetdicom.events.Event
The C-MOVE request :class:`~pynetdicom.events.Event`.
destinations : dict
A :class:`dict` containing know move destinations as
``{b'AE_TITLE: (addr, port)}``
db_path : str
The database path to use with create_engine().
cli_config : dict
A :class:`dict` containing configuration settings passed via CLI.
logger : logging.Logger
The application's logger.
Yields
------
(str, int) or (None, None)
The (IP address, port) of the *Move Destination* (if known).
int
The number of sub-operations required to complete the request.
int or pydicom.dataset.Dataset, pydicom.dataset.Dataset or None
The C-MOVE response's *Status* and if the *Status* is pending then
the dataset to be sent, otherwise ``None``.
"""
requestor = event.assoc.requestor
timestamp = event.timestamp.strftime("%Y-%m-%d %H:%M:%S")
addr, port = requestor.address, requestor.port
logger.info(f"Received C-MOVE request from {addr}:{port} at {timestamp} "
f"with move destination {event.move_destination}")
# Unknown `Move Destination`
try:
addr, port = destinations[event.move_destination]
except KeyError:
logger.info('No matching move destination in the configuration')
yield None, None
return
model = event.request.AffectedSOPClassUID
engine = create_engine(db_path)
with engine.connect() as conn:
Session = sessionmaker(bind=engine)
session = Session()
# Search database using Identifier as the query
try:
matches = search(model, event.identifier, session)
except InvalidIdentifier as exc:
session.rollback()
logger.error('Invalid C-MOVE Identifier received')
logger.error(str(exc))
yield 0xA900, None
return
except Exception as exc:
session.rollback()
logger.error('Exception occurred while querying database')
logger.exception(exc)
yield 0xC520, None
return
finally:
session.close()
# Yield `Move Destination` IP and port, plus required contexts
# We should be able to reduce the number of contexts by using the
# implicit context conversion between:
# implicit VR <-> explicit VR <-> deflated transfer syntaxes
contexts = list(set([ii.context for ii in matches]))
yield addr, port, {'contexts': contexts[:128]}
# Yield number of sub-operations
yield len(matches)
# Yield results
for match in matches:
if event.is_cancelled:
yield 0xFE00, None
return
try:
ds = dcmread(match.filename)
except Exception as exc:
logger.error(f"Error reading file: {fpath}")
logger.exception(exc)
yield 0xC521, None
yield 0xFF00, ds
def handle_find(event, db_path, cli_config, logger):
"""Handler for evt.EVT_C_FIND.
Parameters
----------
event : pynetdicom.events.Event
The C-FIND request :class:`~pynetdicom.events.Event`.
db_path : str
The database path to use with create_engine().
cli_config : dict
A :class:`dict` containing configuration settings passed via CLI.
logger : logging.Logger
The application's logger.
Yields
------
int or pydicom.dataset.Dataset, pydicom.dataset.Dataset or None
The C-FIND response's *Status* and if the *Status* is pending then
the dataset to be sent, otherwise ``None``.
"""
requestor = event.assoc.requestor
timestamp = event.timestamp.strftime("%Y-%m-%d %H:%M:%S")
addr, port = requestor.address, requestor.port
logger.info(f"Received C-FIND request from {addr}:{port} at {timestamp}")
model = event.request.AffectedSOPClassUID
engine = create_engine(db_path)
with engine.connect() as conn:
Session = sessionmaker(bind=engine)
session = Session()
# Search database using Identifier as the query
try:
matches = search(model, event.identifier, session)
except InvalidIdentifier as exc:
session.rollback()
logger.error('Invalid C-FIND Identifier received')
logger.error(str(exc))
yield 0xA900, None
return
except Exception as exc:
session.rollback()
logger.error('Exception occurred while querying database')
logger.exception(exc)
yield 0xC320, None
return
finally:
session.close()
# Yield results
for match in matches:
if event.is_cancelled:
yield 0xFE00, None
return
try:
response = match.as_identifier(event.identifier, model)
response.RetrieveAETitle = event.assoc.ae.ae_title
except Exception as exc:
logger.error("Error creating response Identifier")
logger.exception(exc)
yield 0xC322, None
yield 0xFF00, response
def handle_get(event, db_path, cli_config, logger):
"""Handler for evt.EVT_C_GET.
Parameters
----------
event : pynetdicom.events.Event
The C-GET request :class:`~pynetdicom.events.Event`.
db_path : str
The database path to use with create_engine().
cli_config : dict
A :class:`dict` containing configuration settings passed via CLI.
logger : logging.Logger
The application's logger.
Yields
------
int
The number of sub-operations required to complete the request.
int or pydicom.dataset.Dataset, pydicom.dataset.Dataset or None
The C-GET response's *Status* and if the *Status* is pending then
the dataset to be sent, otherwise ``None``.
"""
requestor = event.assoc.requestor
timestamp = event.timestamp.strftime("%Y-%m-%d %H:%M:%S")
addr, port = requestor.address, requestor.port
logger.info(f"Received C-GET request from {addr}:{port} at {timestamp}")
model = event.request.AffectedSOPClassUID
engine = create_engine(db_path)
with engine.connect() as conn:
Session = sessionmaker(bind=engine)
session = Session()
# Search database using Identifier as the query
try:
matches = search(model, event.identifier, session)
except InvalidIdentifier as exc:
session.rollback()
logger.error("Invalid C-GET Identifier received")
logger.error(str(exc))
yield 0xA900, None
return
except Exception as exc:
session.rollback()
logger.error("Exception occurred while querying database")
logger.exception(exc)
yield 0xC420, None
return
finally:
session.close()
# Yield number of sub-operations
yield len(matches)
# Yield results
for match in matches:
if event.is_cancelled:
yield 0xFE00, None
return
try:
ds = dcmread(match.filename)
except Exception as exc:
logger.error(f"Error reading file: {match.filename}")
logger.exception(exc)
yield 0xC421, None
yield 0xFF00, ds