Module solana_sdk::sysvar::slot_history

A bitvector of slots present over the last epoch.

The slot history sysvar provides access to the SlotHistory type.

The Sysvar::from_account_info and Sysvar::get methods always return ProgramError::UnsupportedSysvar because this sysvar account is too large to process on-chain. Thus this sysvar cannot be accessed on chain, though one can still use the SysvarId::id, SysvarId::check_id and Sysvar::size_of methods in an on-chain program, and it can be accessed off-chain through RPC.

Examples

Calling via the RPC client:

fn print_sysvar_slot_history(client: &RpcClient) -> Result<()> {
    let slot_history = client.get_account(&slot_history::ID)?;
    let data: SlotHistory = bincode::deserialize(&slot_history.data)?;

    Ok(())
}

Structs

AccountInfo

Account information

SlotHistory

A bitvector indicating which slots are present in the past epoch.

Enums

ProgramError

Reasons the program may fail

Statics

ID

The static program ID.

Functions

check_id

Returns true if given pubkey is the program ID.

id

Returns the program ID.