Trait StorageMap

Source

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 { ... }
}