OMEROweb connection/session

[icaoberg]

If a have a connection, is there a way to retrieve the session from the connection?

[cxallan]

Yes, there is. An introduction to the OMERO.web and OMERO Python gateway is here:

http://trac.openmicroscopy.org.uk/ome/w ... Py/Gateway

It has links to the complete documentation for connection object.

[icaoberg]

i am writing an app for omero.web. i am making a connection using the following

Code: Select all

def context( request, query ):
    conn = getBlitzConnection( request )


my question is, is there a way to get the session and client from conn?

ivan

[wmoore]

For Omero Web info start here
http://trac.openmicroscopy.org.uk/ome/wiki/OmeroWeb

In the paragraph starting "In the above example..." you'll find a link to the API for the 'conn' connection wrapper: http://hudson.openmicroscopy.org.uk/job ... class.html

If you need the 4.2 docs, you'll find a link for that too. Look for "BlitzGateway" which is the conn connection wrapper.

You'll find a getSession() method
http://hudson.openmicroscopy.org.uk/vie ... getSession

Looking at the code, I think you can get the client by doing

Code: Select all

conn.c


But I'm not sure if it's a good idea.
What do you need to access session and client for?

[bhcho]

Hi will,

We are trying to use gateway and sharedResouces, which are inherited from session.

from views.py in our omero.web app
we got the session by

Code: Select all

conn = getBlitzConnection( request )
client = conn.c
session = conn.getSession()

then we get the gateway and sharedResources by

Code: Select all

gateway = session.createGateway()
resources = session.sharedResources()

however, we have errors from those two.

is that the correct way to get the session?


the error messages are

gateway = session.createGateway()

File
"/usr0/local/omero.server/OMERO.server-Beta-4.2.1/lib/python/omero_model_SessionI.py",
line 520, in __getattr__
raise AttributeError("'%s' object has no attribute '%s' or '%s'" % (self.__class__.__name__, getter, questn))
AttributeError: 'SessionI' object has no attribute 'getCreateGateway' or 'isCreateGateway'


resources = session.sharedResources()

File
"/usr0/local/omero.server/OMERO.server-Beta-4.2.1/lib/python/omero_model_SessionI.py",
line 520, in __getattr__
raise AttributeError("'%s' object has no attribute '%s' or '%s'" % (self.__class__.__name__, getter, questn))

AttributeError: 'SessionI' object has no attribute 'getSharedResources' or 'isSharedResources'

[jmoore]

Hi BK,

this is the wrong session object. conn.getSession() retures an omero.model.SessionI instance, which represents the metadata about the session in the database. conn.c.getSession() or conn.c.sf return the omero.api.ServiceFactoryPrx, which is a subclass of Glacier2.SessionPrx, which is why this is also called "session". The methods for creating services, etc. are on the service factory.

There may be a more appropriate way to get access to the session from the conn object, but I'll defer to Will on that.

Cheers,
~Josh

[bhcho]

Hi Josh,

conn.c.sf works fine. I'll report if there is another problem with this.
always thanks!

BK