Trait StorageMap

pub trait StorageMap {
    type KEY: Decode + Encode;
    type VALUE: Decode;

    const PALLET_NAME: &'static str;
    const STORAGE_NAME: &'static str;
    const KEY_HASHER: StorageHasher;

    // Provided methods
    fn encode_partial_key() -> [u8; 32] { ... }
    fn hex_encode_partial_key() -> String { ... }
    fn encode_storage_key(key: &Self::KEY) -> Vec<u8>  { ... }
    fn hex_encode_storage_key(key: &Self::KEY) -> String { ... }
    fn decode_storage_key(value: &mut &[u8]) -> Result<Self::KEY, Error> { ... }
    fn decode_storage_value(value: &mut &[u8]) -> Result<Self::VALUE, Error> { ... }
    fn fetch(
        client: &RpcClient,
        key: &Self::KEY,
        at: Option<H256>,
    ) -> impl Future<Output = Result<Option<Self::VALUE>, Error>> { ... }
    fn iter(client: RpcClient, block_hash: H256) -> StorageMapIterator<Self>
       where Self: Sized { ... }
}

Required Associated Constants

const PALLET_NAME: &'static str

const STORAGE_NAME: &'static str

const KEY_HASHER: StorageHasher

Required Associated Types

type KEY: Decode + Encode

type VALUE: Decode

Provided Methods

fn encode_partial_key() -> [u8; 32]

fn hex_encode_partial_key() -> String

fn encode_storage_key(key: &Self::KEY) -> Vec<u8>

fn hex_encode_storage_key(key: &Self::KEY) -> String

fn decode_storage_key(value: &mut &[u8]) -> Result<Self::KEY, Error>

fn decode_storage_value(value: &mut &[u8]) -> Result<Self::VALUE, Error>

fn fetch( client: &RpcClient, key: &Self::KEY, at: Option<H256>, ) -> impl Future<Output = Result<Option<Self::VALUE>, Error>>

fn iter(client: RpcClient, block_hash: H256) -> StorageMapIterator<Self>

where Self: Sized,

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl StorageMap for AppKeys

const PALLET_NAME: &'static str = "DataAvailability"

const STORAGE_NAME: &'static str = "AppKeys"

const KEY_HASHER: StorageHasher = StorageHasher::Blake2_128Concat

type KEY = Vec<u8>

type VALUE = AppKey

impl StorageMap for Account

const PALLET_NAME: &'static str = "System"

const STORAGE_NAME: &'static str = "Account"

const KEY_HASHER: StorageHasher = StorageHasher::Blake2_128Concat

type KEY = AccountId32

type VALUE = AccountInfo