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[FRAME] Make MQ pallet re-entrancy safe (#2356)

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Closes https://github.com/paritytech/polkadot-sdk/issues/2319

Changes:
- Ensure that only `enqueue_message(s)` is callable from within the
message processor. This prevents messed up storage that can currently
happen when the pallet is called into recursively.
- Use `H256` instead of `[u8; 32]` for clearer API.

## Details

The re-entracy check is done with the `environmental` crate by adding a
`with_service_mutex(f)` function that runs the closure exclusively. This
works since the MQ pallet is not instantiable.

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
This commit is contained in:
Oliver Tale-Yazdi
2023-12-07 17:48:13 +01:00
committed by GitHub
parent 95c3ee10bc
commit 7e7fe99047
11 changed files with 478 additions and 79 deletions
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substrate/frame/support/src/traits/messages.rs
+2
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@@ -82,6 +82,8 @@ pub enum ExecuteOverweightError {
QueuePaused,
/// An unspecified error.
Other,
/// Another call is currently ongoing and prevents this call from executing.
RecursiveDisallowed,
}
/// Can service queues and execute overweight messages.