Trait ExtWithInfo

pub trait ExtWithInfo: PrecompileExt {
    // Required methods
    fn get_storage(&mut self, key: &Key) -> Option<Vec<u8>>;
    fn get_storage_size(&mut self, key: &Key) -> Option<u32>;
    fn set_storage(
        &mut self,
        key: &Key,
        value: Option<Vec<u8>>,
        take_old: bool,
    ) -> Result<WriteOutcome, DispatchError>;
    fn charge_storage(&mut self, diff: &Diff);
    fn instantiate(
        &mut self,
        gas_limit: Weight,
        deposit_limit: U256,
        code: Code,
        value: U256,
        input_data: Vec<u8>,
        salt: Option<&[u8; 32]>,
    ) -> Result<H160, ExecError>;
}

Environment functions which are available to pre-compiles with HAS_CONTRACT_INFO = true.

Required Methods

fn get_storage(&mut self, key: &Key) -> Option<Vec<u8>>

Returns the storage entry of the executing account by the given key.

Returns None if the key wasn’t previously set by set_storage or was deleted.

fn get_storage_size(&mut self, key: &Key) -> Option<u32>

Returns Some(len) (in bytes) if a storage item exists at key.

Returns None if the key wasn’t previously set by set_storage or was deleted.

fn set_storage( &mut self, key: &Key, value: Option<Vec<u8>>, take_old: bool, ) -> Result<WriteOutcome, DispatchError>

Sets the storage entry by the given key to the specified value. If value is None then the storage entry is deleted.

fn charge_storage(&mut self, diff: &Diff)

Charges diff from the meter.

fn instantiate( &mut self, gas_limit: Weight, deposit_limit: U256, code: Code, value: U256, input_data: Vec<u8>, salt: Option<&[u8; 32]>, ) -> Result<H160, ExecError>

Instantiate a contract from the given code.

Returns the original code size of the called contract. The newly created account will be associated with code. value specifies the amount of value transferred from the caller to the newly created account.

Implementors