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Support MMR Pruning (#9700)

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* Use `0.3.2`

* Replace `u64` with `NodeIndex`

* Fix Typo

* Add Pruning Logic

* Fix Some Tests

* Remove Comment

* Log Only Under STD

* Return while No Element to Append

* Optimize Pruning Algorithm

* Update Doc

* Update Doc

* Zero Copy Algorithm

* Import Missing Type

* Fix Merge Mistake

* Import Missing Item

* Make `verify` Off-Chain

* `cargo fmt`

* Avoid using NodeIndex in incorrect places.

* Simplify pruning.

* Format

Co-authored-by: Tomasz Drwięga <tomasz@parity.io>
This commit is contained in:
Xavier Lau
2021-11-23 21:04:05 +08:00
committed by GitHub
parent 76737891bb
commit f9122a870e
11 changed files with 165 additions and 61 deletions
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substrate/frame/merkle-mountain-range/primitives/src/lib.rs
+13 -3
View File
@@ -26,6 +26,16 @@ use sp_std::fmt;
#[cfg(not(feature = "std"))]
use sp_std::prelude::Vec;
/// A type to describe node position in the MMR (node index).
pub type NodeIndex = u64;
/// A type to describe leaf position in the MMR.
///
/// Note this is different from [`NodeIndex`], which can be applied to
/// both leafs and inner nodes. Leafs will always have consecutive `LeafIndex`,
/// but might be actually at different positions in the MMR `NodeIndex`.
pub type LeafIndex = u64;
/// A provider of the MMR's leaf data.
pub trait LeafDataProvider {
/// A type that should end up in the leaf of MMR.
@@ -275,9 +285,9 @@ impl_leaf_data_for_tuple!(A:0, B:1, C:2, D:3, E:4);
#[derive(codec::Encode, codec::Decode, RuntimeDebug, Clone, PartialEq, Eq)]
pub struct Proof<Hash> {
/// The index of the leaf the proof is for.
pub leaf_index: u64,
pub leaf_index: LeafIndex,
/// Number of leaves in MMR, when the proof was generated.
pub leaf_count: u64,
pub leaf_count: NodeIndex,
/// Proof elements (hashes of siblings of inner nodes on the path to the leaf).
pub items: Vec<Hash>,
}
@@ -402,7 +412,7 @@ sp_api::decl_runtime_apis! {
/// API to interact with MMR pallet.
pub trait MmrApi<Hash: codec::Codec> {
/// Generate MMR proof for a leaf under given index.
fn generate_proof(leaf_index: u64) -> Result<(EncodableOpaqueLeaf, Proof<Hash>), Error>;
fn generate_proof(leaf_index: LeafIndex) -> Result<(EncodableOpaqueLeaf, Proof<Hash>), Error>;
/// Verify MMR proof against on-chain MMR.
///