Refactor get_session_keys to be a generator based state machine#161
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jlusiardi
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Aug 24, 2019
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| def create_ble_pair_verify_write(characteristic, characteristic_id): | ||
| # This is a temporary wrapper until the pairing functions are also migrated to |
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what needs to be done to handle the temporary?
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When this PR is merged I will raise a similar one for the perform_pair_setup_part1 and perform_pair_setup_part2 functions. At that point this wrapper will go away. It's a fairly mechanical change - if this is merged tomorrow the i will raise the follow up PR Sun evening or Mon morning.
(It's just because the transport is calling TLV.encode_list now, rather than the state machine doing it, and the BLE code path uses the same function for pair_verify and pair_setup. So using the state machine approach for both of them will mean i can get rid of the temporary function, if that makes sense).
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\o/ |
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This will allow me to drop the
get_session_keysfunction from here and use the same function for both the sync and non sync code paths.The idea is to seperate the data exchanges involved in
get_session_keysfrom the network/ble transports. The state machine just takes a TLV input and gives a TLV output, it is 'pure' and side effect free and only operates on data. The invoker is responsible for the actual I/O bit. This means we can use the same logic for async and sync code paths.If we can get an approach we are happy with here there will be a very similar PR for the pairing state machine.
This code could be further simplified - I think ultimately we can refactor away the create_write_function functions as this approach isn't passing callables around. But that can be a seperate PR to keep things small and easy to review.