[QGIS-Developer] Issue with global variables don't get assigned

[Adam Borczyk]

Hi everyone,

I recently sent an e-mail here about JSON string variables messing up my
globals in QGIS 2.18. Today I experienced another bug (?) - very simple
global variable just does not get loaded. The code is:

    # Inside SocketIO worker class:

    def get_srid(self):
        # socket request to the server, returning EPSG code as integer
        self.emit('srid', {}, lambda data: self.assign_srid(data))

    def assign_srid(self, data):
        QgsExpressionContextUtils.setGlobalVariable('srid', str(data))
        QgsMessageLog.logMessage('Assigned SRID: %d' % data , 'myPlugin')

The result of calling get_srid() is correct "Assigned SRID: 4326" in Log
Messages Panel, but in Properties the variable "SRID" is still empty.
Sometimes it works though, after some random number of tries. It also
worked after I purged ~/.config/QGIS/QGIS2.conf file, but it'll possibly
happen again.

Is there anything I have to take special care of?


Best regards
*Adam Borczyk*
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