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Make Digest support StorageAppend (#5922)

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* Make `Digest` support `StorageAppend`

This adds support for `StorageAppend` to `Digest`. Digest is just a
wrapper around a `Vec` and we abuse the fact that SCALE does not puts
any special marker into the encoding for structs. So, we can just append
to the encoded Digest. A test is added that ensures, if the `Digest`
format ever changes, we remove this optimization.

* Update weight

* Update frame/support/src/storage/mod.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Update frame/system/src/lib.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
This commit is contained in:
Bastian Köcher
2020-05-06 23:16:54 +02:00
committed by GitHub
parent fbd2ac8f3b
commit 7ee35f29dc
4 changed files with 58 additions and 13 deletions
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substrate/frame/system/src/lib.rs
+3 -5
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@@ -993,13 +993,11 @@ impl<T: Trait> Module<T> {
/// Deposits a log and ensures it matches the block's log data.
///
/// # <weight>
/// - `O(D)` where `D` length of `Digest`
/// - 1 storage mutation (codec `O(D)`).
/// - `O(1)`
/// - 1 storage write (codec `O(1)`)
/// # </weight>
pub fn deposit_log(item: DigestItemOf<T>) {
let mut l = <Digest<T>>::get();
l.push(item);
<Digest<T>>::put(l);
<Digest<T>>::append(item);
}
/// Get the basic externalities for this module, useful for tests.