Handling java.lang.SecurityExceptions from sensors

[aaaaalbert]

It can happen that Sensibility doesn't have the permission to access a sensor. This then leads to an exception like this:

Exception (with type 'exceptions.Exception'): java.lang.SecurityException: getAllCellInfo:
Neither user 10106 nor current process has android.permission.ACCESS_COARSE_LOCATION.

How are we going to deal with this?

• Make proper Python/Repy/Sensor exceptions. This makes sense in terms of handling these issues in a Repy program, but also means that handling is required! For every sensor in your program, you must always expect that the permission to use it is revoked. Thus, try/except everywhere.
• Alternatively, hide these exceptions from the experiment. You try to access the sensor, but it ... returns None? The previous reading? Or it blocks indefinitely? Something else that makes sense?
• The middle ground: Provide a wrapper layer, base the lower-layer implementation on (1), and provide (2) as the experimenter's interface. Downside: Messing with securitylayers to set the wrappers up.

[aaaaalbert]

My current approach is to handle the SecurityException in Java already, and mask its existence by just returning null through JSON. That's not very beautiful, but we cannot do anything on the Python/Repy end anyway.