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Fix WASM block producer panic (#11206)

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* Box events

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fix tests

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Revert "Box events"

This reverts commit 9fb1887cd23eb272844d63640b0b2d9ba3e549a1.

* Revert "Fix tests"

This reverts commit 981c50f23a7c514c9527299734bc6bc5b77a817f.

* Use simpler approach

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update doc

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
This commit is contained in:
Oliver Tale-Yazdi
2022-04-13 13:55:14 +02:00
committed by GitHub
parent 80ce5c5768
commit ca658002a8
1 changed files with 11 additions and 6 deletions
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substrate/frame/system/src/lib.rs
+11 -6
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@@ -591,11 +591,14 @@ pub mod pallet {
/// Events deposited for the current block.
///
/// NOTE: This storage item is explicitly unbounded since it is never intended to be read
/// from within the runtime.
/// NOTE: The item is unbound and should therefore never be read on chain.
/// It could otherwise inflate the PoV size of a block.
///
/// Events have a large in-memory size. Box the events to not go out-of-memory
/// just in case someone still reads them from within the runtime.
#[pallet::storage]
pub(super) type Events<T: Config> =
StorageValue<_, Vec<EventRecord<T::Event, T::Hash>>, ValueQuery>;
StorageValue<_, Vec<Box<EventRecord<T::Event, T::Hash>>>, ValueQuery>;
/// The number of events in the `Events<T>` list.
#[pallet::storage]
@@ -1213,7 +1216,7 @@ impl<T: Config> Pallet<T> {
old_event_count
};
Events::<T>::append(&event);
Events::<T>::append(event);
for topic in topics {
<EventTopics<T>>::append(topic, &(block_number, event_idx));
@@ -1380,14 +1383,16 @@ impl<T: Config> Pallet<T> {
/// items for any behavior like this.
#[cfg(any(feature = "std", feature = "runtime-benchmarks", test))]
pub fn events() -> Vec<EventRecord<T::Event, T::Hash>> {
Self::read_events_no_consensus()
// Dereferencing the events here is fine since we are not in the
// memory-restricted runtime.
Self::read_events_no_consensus().into_iter().map(|e| *e).collect()
}
/// Get the current events deposited by the runtime.
///
/// Should only be called if you know what you are doing and outside of the runtime block
/// execution else it can have a large impact on the PoV size of a block.
pub fn read_events_no_consensus() -> Vec<EventRecord<T::Event, T::Hash>> {
pub fn read_events_no_consensus() -> Vec<Box<EventRecord<T::Event, T::Hash>>> {
Events::<T>::get()
}