Trait StorageValue

pub trait StorageValue {
    type VALUE: Decode;

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

    // Provided methods
    fn encode_storage_key() -> [u8; 32] { ... }
    fn hex_encode_storage_key() -> String { ... }
    fn hex_decode(value: &str) -> Result<Self::VALUE, Error> { ... }
    fn decode(value: &mut &[u8]) -> Result<Self::VALUE, Error> { ... }
    fn fetch(
        client: &RpcClient,
        at: Option<H256>,
    ) -> impl Future<Output = Result<Option<Self::VALUE>, Error>> { ... }
}

Required Associated Constants

const PALLET_NAME: &'static str

const STORAGE_NAME: &'static str

Required Associated Types

type VALUE: Decode

Provided Methods

fn encode_storage_key() -> [u8; 32]

fn hex_encode_storage_key() -> String

fn hex_decode(value: &str) -> Result<Self::VALUE, Error>

Decodes the Hex and SCALE encoded Storage Value This is equal to Hex::decode + Self::decode

If you need to decode bytes call decode

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

Decodes the SCALE encoded Storage Value

If you need to decode Hex string call hex_decode

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

Fetches and decodes a Storage Value

Returns None if no Storage Value is present

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