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StorageWeightReclaim: set to node pov size if higher #5281

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Aug 13, 2024
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96 changes: 94 additions & 2 deletions cumulus/primitives/storage-weight-reclaim/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,9 @@ where

let storage_size_diff = benchmarked_weight.abs_diff(consumed_weight as u64);

let extrinsic_len = frame_system::AllExtrinsicsLen::<T>::get().unwrap_or(0);
let node_side_pov_size = post_dispatch_proof_size.saturating_add(extrinsic_len.into());

// This value will be reclaimed by [`frame_system::CheckWeight`], so we need to calculate
// that in.
frame_system::BlockWeight::<T>::mutate(|current| {
Expand All @@ -190,6 +193,19 @@ where
);
current.reduce(Weight::from_parts(0, storage_size_diff), info.class)
}

// If we encounter a situation where the node-side proof size is already higher than
// what we have in the runtime bookkeeping, we add the difference to the `BlockWeight`.
// This prevents that the proof size grows faster than the runtime proof size.
let block_weight_proof_size = current.total().proof_size();
let missing_from_node = node_side_pov_size.saturating_sub(block_weight_proof_size);
if missing_from_node > 0 {
log::warn!(
target: LOG_TARGET,
"Node-side PoV size higher than runtime proof size weight. node-side: {node_side_pov_size} extrinsic_len: {extrinsic_len} runtime: {block_weight_proof_size}, missing: {missing_from_node}. Setting to node-side proof size."
);
current.accrue(Weight::from_parts(0, missing_from_node), info.class);
}
});
Ok(())
}
Expand Down Expand Up @@ -332,6 +348,82 @@ mod tests {
})
}

#[test]
fn sets_to_node_storage_proof_if_higher() {
// The storage proof reported by the proof recorder is higher than what is stored on
// the runtime side.
{
let mut test_ext = setup_test_externalities(&[1000, 1005]);

test_ext.execute_with(|| {
// Stored in BlockWeight is 5
set_current_storage_weight(5);

// Benchmarked storage weight: 10
let info = DispatchInfo { weight: Weight::from_parts(0, 10), ..Default::default() };
let post_info = PostDispatchInfo::default();

assert_ok!(CheckWeight::<Test>::do_pre_dispatch(&info, LEN));

let pre = StorageWeightReclaim::<Test>(PhantomData)
.pre_dispatch(&ALICE, CALL, &info, LEN)
.unwrap();
assert_eq!(pre, Some(1000));

assert_ok!(CheckWeight::<Test>::post_dispatch(None, &info, &post_info, 0, &Ok(())));
assert_ok!(StorageWeightReclaim::<Test>::post_dispatch(
Some(pre),
&info,
&post_info,
LEN,
&Ok(())
));

// We expect that the storage weight was set to the node-side proof size (1005) +
// extrinsics length (150)
assert_eq!(get_storage_weight().total().proof_size(), 1155);
})
}

// In this second scenario the proof size on the node side is only lower
// after reclaim happened.
{
let mut test_ext = setup_test_externalities(&[175, 180]);
test_ext.execute_with(|| {
set_current_storage_weight(85);

// Benchmarked storage weight: 100
let info =
DispatchInfo { weight: Weight::from_parts(0, 100), ..Default::default() };
let post_info = PostDispatchInfo::default();

// After this pre_dispatch, the BlockWeight proof size will be
// 85 (initial) + 100 (benched) + 150 (tx length) = 335
assert_ok!(CheckWeight::<Test>::do_pre_dispatch(&info, LEN));

let pre = StorageWeightReclaim::<Test>(PhantomData)
.pre_dispatch(&ALICE, CALL, &info, LEN)
.unwrap();
assert_eq!(pre, Some(175));

assert_ok!(CheckWeight::<Test>::post_dispatch(None, &info, &post_info, 0, &Ok(())));

// First we will reclaim 95, which leaves us with 240 BlockWeight. This is lower
// than 180 (proof size hf) + 150 (length), so we expect it to be set to 330.
assert_ok!(StorageWeightReclaim::<Test>::post_dispatch(
Some(pre),
&info,
&post_info,
LEN,
&Ok(())
));

// We expect that the storage weight was set to the node-side proof weight
assert_eq!(get_storage_weight().total().proof_size(), 330);
})
}
}

#[test]
fn does_nothing_without_extension() {
let mut test_ext = new_test_ext();
Expand Down Expand Up @@ -545,7 +637,7 @@ mod tests {

#[test]
fn test_nothing_relcaimed() {
let mut test_ext = setup_test_externalities(&[100, 200]);
let mut test_ext = setup_test_externalities(&[0, 100]);

test_ext.execute_with(|| {
set_current_storage_weight(0);
Expand All @@ -568,7 +660,7 @@ mod tests {
.pre_dispatch(&ALICE, CALL, &info, LEN)
.unwrap();
// Should return `setup_test_externalities` proof recorder value: 100.
assert_eq!(pre, Some(100));
assert_eq!(pre, Some(0));

// The `CheckWeight` extension will refund `actual_weight` from `PostDispatchInfo`
// we always need to call `post_dispatch` to verify that they interoperate correctly.
Expand Down
17 changes: 17 additions & 0 deletions prdoc/pr_5281.prdoc
Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json

title: PoV-Reclaim - Set `BlockWeight` to node-side PoV size if mismatch is detected

doc:
- audience: Runtime Dev
description: |
After this change, the `StorageWeightReclaim` `SignedExtension` will check the node-side PoV size after every
extrinsic. If we detect a case where the returned proof size is higher than the `BlockWeight` value of the
runtime, we set `BlockWeight` to the size returned from the node.

crates:
- name: cumulus-primitives-storage-weight-reclaim
bump: patch
- name: frame-system
bump: minor
2 changes: 1 addition & 1 deletion substrate/frame/system/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -917,7 +917,7 @@ pub mod pallet {

/// Total length (in bytes) for all extrinsics put together, for the current block.
#[pallet::storage]
pub(super) type AllExtrinsicsLen<T: Config> = StorageValue<_, u32>;
pub type AllExtrinsicsLen<T: Config> = StorageValue<_, u32>;

/// Map of block numbers to block hashes.
#[pallet::storage]
Expand Down
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