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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/primitives/runtime/src/generic/digest.rs
+7 -3
View File
@@ -28,18 +28,22 @@ use sp_core::{ChangesTrieConfiguration, RuntimeDebug};
/// Generic header digest.
#[derive(PartialEq, Eq, Clone, Encode, Decode, RuntimeDebug)]
#[cfg_attr(feature = "std", derive(Serialize, Deserialize, parity_util_mem::MallocSizeOf))]
pub struct Digest<Hash: Encode + Decode> {
pub struct Digest<Hash> {
/// A list of logs in the digest.
#[cfg_attr(
feature = "std",
serde(bound(serialize = "Hash: codec::Codec", deserialize = "Hash: codec::Codec"))
)]
pub logs: Vec<DigestItem<Hash>>,
}
impl<Item: Encode + Decode> Default for Digest<Item> {
impl<Item> Default for Digest<Item> {
fn default() -> Self {
Digest { logs: Vec::new(), }
}
}
impl<Hash: Encode + Decode> Digest<Hash> {
impl<Hash> Digest<Hash> {
/// Get reference to all digest items.
pub fn logs(&self) -> &[DigestItem<Hash>] {
&self.logs