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Introduce storage types, to builds abstraction on storage (to be used in pallet attribute macro) (#7278)

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* introduce storage types

* fix line width

* improve doc

* typo

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* remove redundant function

* some more doc improvment

* disallow: some value on empty with option query

tests are update to still test default value is used when it is supposed
to be used.

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
This commit is contained in:
Guillaume Thiolliere
2020-11-03 11:08:36 +01:00
committed by GitHub
parent 7fcf0ff610
commit ff6b603d69
7 changed files with 1501 additions and 0 deletions
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substrate/frame/support/src/hash.rs
+8
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@@ -56,6 +56,7 @@ impl<T: Codec> Hashable for T {
/// Hasher to use to hash keys to insert to storage.
pub trait StorageHasher: 'static {
const METADATA: frame_metadata::StorageHasher;
type Output: AsRef<[u8]>;
fn hash(x: &[u8]) -> Self::Output;
}
@@ -73,6 +74,7 @@ pub trait ReversibleStorageHasher: StorageHasher {
/// Store the key directly.
pub struct Identity;
impl StorageHasher for Identity {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Identity;
type Output = Vec<u8>;
fn hash(x: &[u8]) -> Vec<u8> {
x.to_vec()
@@ -87,6 +89,7 @@ impl ReversibleStorageHasher for Identity {
/// Hash storage keys with `concat(twox64(key), key)`
pub struct Twox64Concat;
impl StorageHasher for Twox64Concat {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Twox64Concat;
type Output = Vec<u8>;
fn hash(x: &[u8]) -> Vec<u8> {
twox_64(x)
@@ -109,6 +112,7 @@ impl ReversibleStorageHasher for Twox64Concat {
/// Hash storage keys with `concat(blake2_128(key), key)`
pub struct Blake2_128Concat;
impl StorageHasher for Blake2_128Concat {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Blake2_128Concat;
type Output = Vec<u8>;
fn hash(x: &[u8]) -> Vec<u8> {
blake2_128(x)
@@ -131,6 +135,7 @@ impl ReversibleStorageHasher for Blake2_128Concat {
/// Hash storage keys with blake2 128
pub struct Blake2_128;
impl StorageHasher for Blake2_128 {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Blake2_128;
type Output = [u8; 16];
fn hash(x: &[u8]) -> [u8; 16] {
blake2_128(x)
@@ -140,6 +145,7 @@ impl StorageHasher for Blake2_128 {
/// Hash storage keys with blake2 256
pub struct Blake2_256;
impl StorageHasher for Blake2_256 {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Blake2_256;
type Output = [u8; 32];
fn hash(x: &[u8]) -> [u8; 32] {
blake2_256(x)
@@ -149,6 +155,7 @@ impl StorageHasher for Blake2_256 {
/// Hash storage keys with twox 128
pub struct Twox128;
impl StorageHasher for Twox128 {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Twox128;
type Output = [u8; 16];
fn hash(x: &[u8]) -> [u8; 16] {
twox_128(x)
@@ -158,6 +165,7 @@ impl StorageHasher for Twox128 {
/// Hash storage keys with twox 256
pub struct Twox256;
impl StorageHasher for Twox256 {
const METADATA: frame_metadata::StorageHasher = frame_metadata::StorageHasher::Twox256;
type Output = [u8; 32];
fn hash(x: &[u8]) -> [u8; 32] {
twox_256(x)