81 lines
2.5 KiB
Rust
81 lines
2.5 KiB
Rust
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//! system smart contract
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use bank::Account;
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use bincode::deserialize;
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use signature::Pubkey;
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use transaction::Transaction;
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#[derive(Serialize, Deserialize, Debug, Clone)]
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pub enum SystemContract {
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/// Create a new account
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/// * Transaction::keys[0] - source
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/// * Transaction::keys[1] - new account key
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/// * tokens - number of tokens to transfer to the new account
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/// * space - memory to allocate if greater then zero
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/// * contract - the contract id of the new account
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CreateAccount {
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tokens: i64,
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space: u64,
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contract_id: Option<Pubkey>,
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},
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/// Assign account to a contract
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/// * Transaction::keys[0] - account to assign
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Assign { contract_id: Pubkey },
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/// Move tokens
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/// * Transaction::keys[0] - source
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/// * Transaction::keys[1] - destination
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Move { tokens: i64 },
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}
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pub const SYSTEM_CONTRACT_ID: [u8; 32] = [0u8; 32];
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impl SystemContract {
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pub fn check_id(contract_id: &Pubkey) -> bool {
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contract_id.as_ref() == SYSTEM_CONTRACT_ID
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}
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pub fn id() -> Pubkey {
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Pubkey::new(&SYSTEM_CONTRACT_ID)
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}
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pub fn get_balance(account: &Account) -> i64 {
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account.tokens
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}
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pub fn process_transaction(tx: &Transaction, accounts: &mut [Account]) {
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let syscall: SystemContract = deserialize(&tx.userdata).unwrap();
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match syscall {
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SystemContract::CreateAccount {
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tokens,
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space,
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contract_id,
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} => {
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if !Self::check_id(&accounts[1].contract_id) {
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return;
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}
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if !Self::check_id(&accounts[0].contract_id) {
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return;
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}
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if space > 0 && !accounts[1].userdata.is_empty() {
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return;
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}
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accounts[0].tokens -= tokens;
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accounts[1].tokens += tokens;
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if let Some(id) = contract_id {
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accounts[1].contract_id = id;
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}
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accounts[1].userdata = vec![0; space as usize];
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}
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SystemContract::Assign { contract_id } => {
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if !Self::check_id(&accounts[0].contract_id) {
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return;
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}
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accounts[0].contract_id = contract_id;
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}
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SystemContract::Move { tokens } => {
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//bank should be verifying correctness
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accounts[0].tokens -= tokens;
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accounts[1].tokens += tokens;
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}
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}
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}
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}
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