Created
August 6, 2024 15:42
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| use anchor_lang::prelude::*; | |
| use arrayref::array_ref; | |
| use bytemuck; | |
| use crate::SwitchboardError; | |
| #[repr(C)] | |
| #[derive(bytemuck::Pod, bytemuck::Zeroable, Debug, Clone, Copy)] | |
| pub struct SlotHash { | |
| pub slot: u64, | |
| pub hash: [u8; 32], | |
| } | |
| // Need to binary search since slots are often skipped | |
| pub fn find_idx(slot_hashes: &[SlotHash], slot: u64) -> Option<usize> { | |
| slot_hashes.binary_search_by(|x| slot.cmp(&x.slot)).ok() | |
| } | |
| pub struct SlotHashSysvar; | |
| impl<'a> SlotHashSysvar { | |
| pub fn get_slothash(slot_sysvar: &AccountInfo<'a>, slot: u64) -> Result<[u8; 32]> { | |
| let slot_hashes = slot_sysvar; | |
| let slots_data = slot_hashes.data.borrow(); | |
| let slots: &[u8] = array_ref![slots_data, 8, 20_480]; | |
| // 20_480 / 40 = 512 | |
| let slots: &[SlotHash] = bytemuck::cast_slice::<u8, SlotHash>(slots); | |
| if slot > slots[0].slot { | |
| msg!("Error: Your provided slot is too new. Please use confirmed commitment for your connection and processed for simulation."); | |
| return Err(error!(SwitchboardError::InvalidSlotNumber)); | |
| } | |
| let idx = find_idx(&slots[..], slot).unwrap(); | |
| let signed_slot = slots[idx]; | |
| assert_eq!(signed_slot.slot, slot); | |
| Ok(signed_slot.hash) | |
| } | |
| pub fn parse(data: &'a [u8]) -> &'a [SlotHash] { | |
| bytemuck::cast_slice::<u8, SlotHash>(&data[8..]) | |
| } | |
| } |
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