[ome-users] BlitzGateway: keep connection alive to write large ROIs

[Paul Korir]

Dear OMERO Users/Developers,

I'm writing a client application which connects to an OMERO server 
through a BlitzGateway object but I get a lost-connection exception. 
Could someone please advise me on how to keep a connection open? The 
snippet of code is roughly the following:

conn = omero.gateway.BlitzGateway(...)
roi = <some large ROI object>
conn.getUpdateService().saveObject(roi)

Please see the traceback below:

Traceback (most recent call last):
   File 
"/Users/pkorir/omero/OMERO.server/lib/python/omero/gateway/__init__.py", 
line 4212, in __call__
     return self.f(*args, **kwargs)
   File 
"/Users/pkorir/omero/OMERO.server/lib/python/omero_api_IUpdate_ice.py", 
line 131, in saveAndReturnObject
     return _M_omero.api.IUpdate._op_saveAndReturnObject.invoke(self, 
((obj, ), _ctx))
ConnectionLostException: Ice.ConnectionLostException:
Broken pipe
Fri Apr 21 17:02:55 2017    Closing the connection...
Fri Apr 21 17:02:55 2017    Deleting ROIHandler instance... OK
WARNING:omero.client:Cannot get session service for killSession. Using 
closeSession
Fri Apr 21 17:02:55 2017    Connection closed.
Traceback (most recent call last):
   File "/Users/pkorir/VirtualEnvs/sfftk/bin/sffp", line 11, in <module>
     load_entry_point('sfftk-plus', 'console_scripts', 'sffp')()
   File 
"/Users/pkorir/Documents/workspace/bioimaging-scripts/trunk/sfftk-plus/sfftkplus/sffplus.py", 
line 460, in main
     return handle_attachroi(args)
   File 
"/Users/pkorir/Documents/workspace/bioimaging-scripts/trunk/sfftk-plus/sfftkplus/sffplus.py", 
line 381, in handle_attachroi
     omero_connection.saveRoi(roi)
   File 
"/Users/pkorir/Documents/workspace/bioimaging-scripts/trunk/sfftk-plus/sfftkplus/omero/handlers.py", 
line 149, in saveRoi
     self.conn.getUpdateService().saveAndReturnObject(roi)
   File 
"/Users/pkorir/omero/OMERO.server/lib/python/omero/gateway/__init__.py", 
line 4215, in __call__
     return self.handle_exception(e, *args, **kwargs)
   File 
"/Users/pkorir/omero/OMERO.server/lib/python/omero/gateway/__init__.py", 
line 4212, in __call__
     return self.f(*args, **kwargs)
   File 
"/Users/pkorir/omero/OMERO.server/lib/python/omero_api_IUpdate_ice.py", 
line 131, in saveAndReturnObject
     return _M_omero.api.IUpdate._op_saveAndReturnObject.invoke(self, 
((obj, ), _ctx))
Ice.ConnectionLostException: Ice.ConnectionLostException:
Broken pipe

-- 
Paul K. Korir, PhD
Scientific Programmer
EMBL-EBI
01223494422