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Tsvetomir Dimitrov
90234543f3
This PR notifies broker pallet for any parachain slot swaps performed on the relay chain. This is achieved by registering an `OnSwap` for the the `coretime` pallet. The hook sends XCM message to the broker chain and invokes a new extrinsic `swap_leases` which updates `Leases` storage item (which keeps the legacy parachain leases). I made two assumptions in this PR: 1. [`Leases`](https://github.com/paritytech/polkadot-sdk/blob/4987d7982461e2e5ffe219cdf71ec697284cea7c/substrate/frame/broker/src/lib.rs#L120) in `broker` pallet and [`Leases`](https://github.com/paritytech/polkadot-sdk/blob/4987d7982461e2e5ffe219cdf71ec697284cea7c/polkadot/runtime/common/src/slots/mod.rs#L118) in `slots` pallet are in sync. 2. `swap_leases` extrinsic from `broker` pallet can be triggered only by root or by the XCM message from the relay chain. If not - the extrinsic will generate an error and do nothing. As a side effect from the changes `OnSwap` trait is moved from runtime/common/traits.rs to runtime/parachains. Otherwise it is not accessible from `broker` pallet. Closes https://github.com/paritytech/polkadot-sdk/issues/3552 TODOs: - [x] Weights - [x] Tests --------- Co-authored-by: command-bot <> Co-authored-by: eskimor <eskimor@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de>
FRAME
The FRAME development environment provides modules (called "pallets") and support libraries that you can use, modify, and extend to build the runtime logic to suit the needs of your blockchain.
Documentation
https://docs.substrate.io/reference/frame-pallets/