Hello dear GNU Health community ,
I am currently writing my master thesis and trying to implement a periodic
synchronisation of the Orthanc and GNU Health DB. Unfortunately I run into some
problems. I create a background thread in which the synchronisation should be
done periodically. My idea was to initialise the variable "sync_thread = None"
in the class "OrthancServerConfig" in order to be able to start and stop the
synchronisation via a start and stop button. In addition, I use the already
implemented method "sync" of the same class. I have already tried this:
class SyncThread(threading.Thread):
"""A background thread that periodically synchronizes data with an Orthanc
server."""
def __init__(self, servers=None, timeout=180):
"""
Initialize the SyncThread object as a background service.
:param servers: A list of Orthanc servers.
:type servers: list
:param timeout: The time interval (in seconds) between each
synchronization.
:type timeout: int
"""
threading.Thread.__init__(self,
name="OrthancPeriodicSyncronizationThread")
self.daemon = True
self.servers = servers
self.timeout = timeout
self.stop_event = threading.Event()
def run(self):
"""Call loop with timeout to synchronize the Orthanc DB with the GNU
Health DB."""
with Transaction().start(): <-- (line in which error 1 occurs)
while not self.stop_event.is_set():
OrthancServerConfig.sync(self.servers)
self.stop_event.wait(self.timeout)
def stop(self):
"""Stop the synchronization thread."""
self.stop_event.set()
Class OrthancServerConfig(ModelSQL, ModelView):
sync_thread = None
...
@classmethod
@ModelView.button
def start_periodic_sync(cls, servers):
"""
Initializes the synchronization of data with Orthanc as a background
service.
:param servers: A list of Orthanc servers.
:type servers: list
"""
if cls.sync_thread is not None:
raise UserWarning("Synchronization is already running!")
else:
cls.sync_thread = SyncThread(servers=servers)
cls.sync_thread.start()
@classmethod
@ModelView.button
def stop_periodic_sync(cls): <-- (error 2 occurs here, when "stop"-button
is pressed)
"""
Stop the synchronization thread.
"""
if cls.sync_thread is None:
raise UserWarning("No synchronization is performed!")
else:
cls.sync_thread.stop()
cls.sync_thread.join()
cls.sync_thread = None
2 errors occur, for which I unfortunately don't know an answer to fix them.
Error 1 occurs, when the "start" button is pressed and the "run"-method of the
class "SyncThread" is triggered:
orthanc/health_orthanc.py", line 66, in run
with Transaction().start():
TypeError: Transaction.start() missing 2 required positional arguments:
'database_name' and 'user'
I'm not sure, if "with Transaction.start():" is necessary here, but i tried
this, because i got this error before:
orthanc/health_orthanc.py", line 269, in sync
pool = Pool()
File "/opt/gnuhealth/venv/lib/python3.10/site-packages/trytond/pool.py",
line 61, in __new__
database_name = Transaction().database.name
AttributeError: 'NoneType' object has no attribute 'name'
If "with Transaction.start():" is required, unfortunately I wasn't able to
figure out which are the two required arguments or if the solution is generally
in a completely different direction.
The second error occurs, when the "stop" button is pressed:
TypeError: OrthancServerConfig.stop_periodic_sync() takes 1 positional
argument but 2 were given
Here I was also not able to interpret the error, because both my button and the
stop method are not passed 2 arguments.
I would be grateful for any help and am available for queries!
Best regards,
Patryk
