2019-05-21 15:19:41 -07:00
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//! named accounts for synthesized data accounts for bank state, etc.
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//!
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//! this account carries the Bank's most recent blockhashes for some N parents
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//!
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use crate::account::Account;
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2019-05-22 19:07:56 -07:00
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use crate::account_utils::State;
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2019-05-21 15:19:41 -07:00
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use crate::hash::Hash;
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use crate::pubkey::Pubkey;
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2019-05-22 19:07:56 -07:00
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use crate::syscall;
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use bincode::serialized_size;
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use std::ops::Deref;
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2019-05-21 15:19:41 -07:00
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/// "Sysca11SlotHashes11111111111111111111111111"
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/// slot hashes account pubkey
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2019-05-22 19:07:56 -07:00
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const ID: [u8; 32] = [
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2019-05-21 15:19:41 -07:00
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6, 167, 211, 138, 69, 219, 186, 157, 48, 170, 46, 66, 2, 146, 193, 59, 39, 59, 245, 188, 30,
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60, 130, 78, 86, 27, 113, 191, 208, 0, 0, 0,
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];
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pub fn id() -> Pubkey {
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Pubkey::new(&ID)
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2019-05-21 15:19:41 -07:00
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}
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2019-05-21 21:45:38 -07:00
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pub fn check_id(pubkey: &Pubkey) -> bool {
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2019-05-22 19:07:56 -07:00
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pubkey.as_ref() == ID
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2019-05-21 21:45:38 -07:00
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}
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2019-05-22 19:07:56 -07:00
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pub const MAX_SLOT_HASHES: usize = 512; // 512 slots to get your vote in
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#[derive(Serialize, Deserialize, PartialEq, Debug)]
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pub struct SlotHashes {
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// non-pub to keep control of size
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inner: Vec<(u64, Hash)>,
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}
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2019-05-21 15:19:41 -07:00
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impl SlotHashes {
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pub fn from(account: &Account) -> Option<Self> {
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account.state().ok()
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}
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pub fn to(&self, account: &mut Account) -> Option<()> {
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account.set_state(self).ok()
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}
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pub fn size_of() -> usize {
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serialized_size(&SlotHashes {
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inner: vec![(0, Hash::default()); MAX_SLOT_HASHES],
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})
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.unwrap() as usize
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}
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pub fn add(&mut self, slot: u64, hash: Hash) {
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self.inner.insert(0, (slot, hash));
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self.inner.truncate(MAX_SLOT_HASHES);
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}
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2019-05-21 15:19:41 -07:00
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}
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2019-05-22 19:07:56 -07:00
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2019-05-21 15:19:41 -07:00
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impl Deref for SlotHashes {
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type Target = Vec<(u64, Hash)>;
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fn deref(&self) -> &Self::Target {
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&self.inner
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}
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}
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2019-05-22 19:07:56 -07:00
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pub fn create_account(lamports: u64) -> Account {
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Account::new(lamports, SlotHashes::size_of(), &syscall::id())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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2019-05-22 19:07:56 -07:00
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use crate::hash::hash;
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2019-05-21 15:19:41 -07:00
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#[test]
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fn test_slot_hashes_id() {
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let ids = [("Sysca11S1otHashes11111111111111111111111111", id())];
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// to get the bytes above:
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// ids.iter().for_each(|(name, _)| {
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// dbg!((name, bs58::decode(name).into_vec().unwrap()));
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// });
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assert!(ids.iter().all(|(name, id)| *name == id.to_string()));
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assert!(check_id(&id()));
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}
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#[test]
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fn test_slot_hashes_create_account() {
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let lamports = 42;
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let account = create_account(lamports);
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let slot_hashes = SlotHashes::from(&account);
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assert_eq!(slot_hashes, Some(SlotHashes { inner: vec![] }));
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let mut slot_hashes = slot_hashes.unwrap();
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for i in 0..MAX_SLOT_HASHES + 1 {
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slot_hashes.add(
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i as u64,
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hash(&[(i >> 24) as u8, (i >> 16) as u8, (i >> 8) as u8, i as u8]),
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);
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}
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assert_eq!(slot_hashes[0].0, MAX_SLOT_HASHES as u64);
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assert_eq!(slot_hashes.len(), MAX_SLOT_HASHES);
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2019-05-21 15:19:41 -07:00
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}
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}
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