Trait aptos_state_view::StateView

pub trait StateView: Sync {
    fn get_state_value(&self, state_key: &StateKey) -> Result<Option<Vec<u8>>>;
    fn is_genesis(&self) -> bool;

    fn id(&self) -> StateViewId { ... }
}

StateView is a trait that defines a read-only snapshot of the global state. It is passed to the VM for transaction execution, during which the VM is guaranteed to read anything at the given state.

Required Methods

fn get_state_value(&self, state_key: &StateKey) -> Result<Option<Vec<u8>>>

Gets the state value for a given state key.

fn is_genesis(&self) -> bool

VM needs this method to know whether the current state view is for genesis state creation. Currently TransactionPayload::WriteSet is only valid for genesis state creation.

Provided Methods

fn id(&self) -> StateViewId

For logging and debugging purpose, identifies what this view is for.

Implementors

impl<R, S> StateView for R where
    R: Deref<Target = S> + Sync,
    S: StateView,