Merge pull request #66 from garious/conditional-plan
Simplify contract language
This commit is contained in:
commit
4f09e5d04c
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@ -5,7 +5,8 @@
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use hash::Hash;
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use entry::Entry;
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use event::Event;
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use transaction::{Action, Plan, Transaction};
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use plan::{Action, Plan, PlanEvent};
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use transaction::Transaction;
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use signature::{KeyPair, PublicKey, Signature};
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use mint::Mint;
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use historian::{reserve_signature, Historian};
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@ -30,7 +31,7 @@ pub struct Accountant {
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pub balances: HashMap<PublicKey, i64>,
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pub first_id: Hash,
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pub last_id: Hash,
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pending: HashMap<Signature, Plan<i64>>,
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pending: HashMap<Signature, Plan>,
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time_sources: HashSet<PublicKey>,
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last_time: DateTime<Utc>,
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}
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@ -83,7 +84,7 @@ impl Accountant {
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self.last_id
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}
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fn is_deposit(allow_deposits: bool, from: &PublicKey, plan: &Plan<i64>) -> bool {
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fn is_deposit(allow_deposits: bool, from: &PublicKey, plan: &Plan) -> bool {
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if let Plan::Action(Action::Pay(ref payment)) = *plan {
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allow_deposits && *from == payment.to
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} else {
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@ -91,7 +92,7 @@ impl Accountant {
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}
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}
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pub fn process_transaction(self: &mut Self, tr: Transaction<i64>) -> Result<()> {
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pub fn process_transaction(self: &mut Self, tr: Transaction) -> Result<()> {
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if !tr.verify() {
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return Err(AccountingError::InvalidTransfer);
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}
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@ -112,7 +113,7 @@ impl Accountant {
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}
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/// Commit funds to the 'to' party.
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fn complete_transaction(self: &mut Self, plan: &Plan<i64>) {
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fn complete_transaction(self: &mut Self, plan: &Plan) {
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if let Plan::Action(Action::Pay(ref payment)) = *plan {
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if self.balances.contains_key(&payment.to) {
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if let Some(x) = self.balances.get_mut(&payment.to) {
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@ -126,7 +127,7 @@ impl Accountant {
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fn process_verified_transaction(
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self: &mut Self,
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tr: &Transaction<i64>,
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tr: &Transaction,
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allow_deposits: bool,
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) -> Result<()> {
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if !reserve_signature(&mut self.historian.signatures, &tr.sig) {
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@ -140,7 +141,7 @@ impl Accountant {
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}
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let mut plan = tr.plan.clone();
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let actionable = plan.process_verified_timestamp(self.last_time);
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let actionable = plan.process_event(PlanEvent::Timestamp(self.last_time));
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if !actionable {
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self.pending.insert(tr.sig, plan);
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@ -153,7 +154,7 @@ impl Accountant {
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fn process_verified_sig(&mut self, from: PublicKey, tx_sig: Signature) -> Result<()> {
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let actionable = if let Some(plan) = self.pending.get_mut(&tx_sig) {
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plan.process_verified_sig(from)
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plan.process_event(PlanEvent::Signature(from))
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} else {
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false
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};
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@ -185,7 +186,7 @@ impl Accountant {
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// Check to see if any timelocked transactions can be completed.
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let mut completed = vec![];
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for (key, plan) in &mut self.pending {
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if plan.process_verified_timestamp(self.last_time) {
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if plan.process_event(PlanEvent::Timestamp(self.last_time)) {
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completed.push(key.clone());
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}
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}
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@ -19,7 +19,7 @@ pub struct AccountantSkel {
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#[derive(Serialize, Deserialize, Debug)]
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pub enum Request {
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Transaction(Transaction<i64>),
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Transaction(Transaction),
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GetBalance { key: PublicKey },
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GetEntries { last_id: Hash },
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GetId { is_last: bool },
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@ -26,7 +26,7 @@ impl AccountantStub {
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}
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}
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pub fn transfer_signed(&self, tr: Transaction<i64>) -> io::Result<usize> {
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pub fn transfer_signed(&self, tr: Transaction) -> io::Result<usize> {
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let req = Request::Transaction(tr);
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let data = serialize(&req).unwrap();
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self.socket.send_to(&data, &self.addr)
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@ -7,7 +7,7 @@ use bincode::serialize;
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Event {
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Transaction(Transaction<i64>),
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Transaction(Transaction),
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Signature {
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from: PublicKey,
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tx_sig: Signature,
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@ -1,6 +1,7 @@
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#![cfg_attr(feature = "unstable", feature(test))]
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pub mod signature;
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pub mod hash;
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pub mod plan;
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pub mod transaction;
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pub mod event;
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pub mod entry;
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@ -58,7 +58,7 @@ impl Mint {
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mod tests {
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use super::*;
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use log::verify_slice;
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use transaction::{Action, Plan};
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use plan::{Action, Plan};
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#[test]
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fn test_create_events() {
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@ -0,0 +1,188 @@
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//! The `plan` crate provides functionality for creating spending plans.
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use signature::PublicKey;
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use chrono::prelude::*;
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use std::mem;
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Condition {
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Timestamp(DateTime<Utc>),
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Signature(PublicKey),
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}
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pub enum PlanEvent {
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Timestamp(DateTime<Utc>),
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Signature(PublicKey),
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}
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impl Condition {
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pub fn is_satisfied(&self, event: &PlanEvent) -> bool {
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match (self, event) {
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(&Condition::Signature(ref pubkey), &PlanEvent::Signature(ref from)) => pubkey == from,
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(&Condition::Timestamp(ref dt), &PlanEvent::Timestamp(ref last_time)) => {
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dt <= last_time
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}
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_ => false,
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}
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}
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Action {
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Pay(Payment),
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}
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impl Action {
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pub fn spendable(&self) -> i64 {
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match *self {
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Action::Pay(ref payment) => payment.asset,
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}
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}
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub struct Payment {
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pub asset: i64,
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pub to: PublicKey,
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Plan {
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Action(Action),
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After(Condition, Action),
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Race((Condition, Action), (Condition, Action)),
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}
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impl Plan {
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pub fn new_payment(asset: i64, to: PublicKey) -> Self {
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Plan::Action(Action::Pay(Payment { asset, to }))
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}
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pub fn new_authorized_payment(from: PublicKey, asset: i64, to: PublicKey) -> Self {
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Plan::After(
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Condition::Signature(from),
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Action::Pay(Payment { asset, to }),
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)
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}
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pub fn new_future_payment(dt: DateTime<Utc>, asset: i64, to: PublicKey) -> Self {
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Plan::After(Condition::Timestamp(dt), Action::Pay(Payment { asset, to }))
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}
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pub fn new_cancelable_future_payment(
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dt: DateTime<Utc>,
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from: PublicKey,
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asset: i64,
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to: PublicKey,
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) -> Self {
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Plan::Race(
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(Condition::Timestamp(dt), Action::Pay(Payment { asset, to })),
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(
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Condition::Signature(from),
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Action::Pay(Payment { asset, to: from }),
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),
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)
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}
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pub fn verify(&self, spendable_assets: i64) -> bool {
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match *self {
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Plan::Action(ref action) => action.spendable() == spendable_assets,
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Plan::After(_, ref action) => action.spendable() == spendable_assets,
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Plan::Race(ref a, ref b) => {
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a.1.spendable() == spendable_assets && b.1.spendable() == spendable_assets
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}
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}
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}
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pub fn process_event(&mut self, event: PlanEvent) -> bool {
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let mut new_action = None;
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match *self {
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Plan::Action(_) => return true,
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Plan::After(ref cond, ref action) => {
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if cond.is_satisfied(&event) {
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new_action = Some(action.clone());
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}
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}
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Plan::Race(ref a, ref b) => {
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if a.0.is_satisfied(&event) {
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new_action = Some(a.1.clone());
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} else if b.0.is_satisfied(&event) {
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new_action = Some(b.1.clone());
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}
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}
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}
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if let Some(action) = new_action {
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mem::replace(self, Plan::Action(action));
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true
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} else {
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false
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}
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}
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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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#[test]
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fn test_signature_satisfied() {
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let sig = PublicKey::default();
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assert!(Condition::Signature(sig).is_satisfied(&PlanEvent::Signature(sig)));
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}
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#[test]
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fn test_timestamp_satisfied() {
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let dt1 = Utc.ymd(2014, 11, 14).and_hms(8, 9, 10);
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let dt2 = Utc.ymd(2014, 11, 14).and_hms(10, 9, 8);
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assert!(Condition::Timestamp(dt1).is_satisfied(&PlanEvent::Timestamp(dt1)));
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assert!(Condition::Timestamp(dt1).is_satisfied(&PlanEvent::Timestamp(dt2)));
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assert!(!Condition::Timestamp(dt2).is_satisfied(&PlanEvent::Timestamp(dt1)));
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}
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#[test]
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fn test_verify_plan() {
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let dt = Utc.ymd(2014, 11, 14).and_hms(8, 9, 10);
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let from = PublicKey::default();
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let to = PublicKey::default();
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assert!(Plan::new_payment(42, to).verify(42));
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assert!(Plan::new_authorized_payment(from, 42, to).verify(42));
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assert!(Plan::new_future_payment(dt, 42, to).verify(42));
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assert!(Plan::new_cancelable_future_payment(dt, from, 42, to).verify(42));
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}
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#[test]
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fn test_authorized_payment() {
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let from = PublicKey::default();
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let to = PublicKey::default();
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let mut plan = Plan::new_authorized_payment(from, 42, to);
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assert!(plan.process_event(PlanEvent::Signature(from)));
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assert_eq!(plan, Plan::new_payment(42, to));
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}
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#[test]
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fn test_future_payment() {
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let dt = Utc.ymd(2014, 11, 14).and_hms(8, 9, 10);
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let to = PublicKey::default();
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let mut plan = Plan::new_future_payment(dt, 42, to);
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assert!(plan.process_event(PlanEvent::Timestamp(dt)));
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assert_eq!(plan, Plan::new_payment(42, to));
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}
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#[test]
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fn test_cancelable_future_payment() {
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let dt = Utc.ymd(2014, 11, 14).and_hms(8, 9, 10);
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let from = PublicKey::default();
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let to = PublicKey::default();
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let mut plan = Plan::new_cancelable_future_payment(dt, from, 42, to);
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assert!(plan.process_event(PlanEvent::Timestamp(dt)));
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assert_eq!(plan, Plan::new_payment(42, to));
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let mut plan = Plan::new_cancelable_future_payment(dt, from, 42, to);
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assert!(plan.process_event(PlanEvent::Signature(from)));
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assert_eq!(plan, Plan::new_payment(42, from));
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}
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}
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@ -1,147 +1,24 @@
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//! The `transaction` crate provides functionality for creating log transactions.
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use signature::{KeyPair, KeyPairUtil, PublicKey, Signature, SignatureUtil};
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use serde::Serialize;
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use bincode::serialize;
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use hash::Hash;
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use chrono::prelude::*;
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use std::mem;
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use plan::{Action, Condition, Payment, Plan};
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Condition {
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Timestamp(DateTime<Utc>),
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Signature(PublicKey),
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Action<T> {
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Pay(Payment<T>),
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}
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impl<T: Clone> Action<T> {
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pub fn spendable(&self) -> T {
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match *self {
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Action::Pay(ref payment) => payment.asset.clone(),
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}
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}
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub struct Payment<T> {
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pub asset: T,
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pub to: PublicKey,
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}
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
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pub enum Plan<T> {
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Action(Action<T>),
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After(Condition, Action<T>),
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Race(Box<Plan<T>>, Box<Plan<T>>),
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}
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impl<T: Clone + Eq> Plan<T> {
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pub fn verify(&self, spendable_assets: &T) -> bool {
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match *self {
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Plan::Action(ref action) => action.spendable() == *spendable_assets,
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Plan::Race(ref plan_a, ref plan_b) => {
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plan_a.verify(spendable_assets) && plan_b.verify(spendable_assets)
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}
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Plan::After(_, ref action) => action.spendable() == *spendable_assets,
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}
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}
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pub fn run_race(&mut self) -> bool {
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let new_plan = if let Plan::Race(ref a, ref b) = *self {
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if let Plan::Action(_) = **a {
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Some((**a).clone())
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} else if let Plan::Action(_) = **b {
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Some((**b).clone())
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} else {
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None
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}
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} else {
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None
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};
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if let Some(plan) = new_plan {
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mem::replace(self, plan);
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true
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} else {
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false
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}
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}
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pub fn process_verified_sig(&mut self, from: PublicKey) -> bool {
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let mut new_plan = None;
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match *self {
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Plan::Action(_) => return true,
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Plan::Race(ref mut plan_a, ref mut plan_b) => {
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plan_a.process_verified_sig(from);
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plan_b.process_verified_sig(from);
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}
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Plan::After(Condition::Signature(pubkey), ref action) => {
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if from == pubkey {
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new_plan = Some(Plan::Action(action.clone()));
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}
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}
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_ => (),
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}
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if self.run_race() {
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return true;
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}
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|
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if let Some(plan) = new_plan {
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mem::replace(self, plan);
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true
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} else {
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false
|
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}
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}
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|
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pub fn process_verified_timestamp(&mut self, last_time: DateTime<Utc>) -> bool {
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let mut new_plan = None;
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match *self {
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Plan::Action(_) => return true,
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Plan::Race(ref mut plan_a, ref mut plan_b) => {
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plan_a.process_verified_timestamp(last_time);
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plan_b.process_verified_timestamp(last_time);
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}
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Plan::After(Condition::Timestamp(dt), ref action) => {
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if dt <= last_time {
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new_plan = Some(Plan::Action(action.clone()));
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}
|
||||
}
|
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_ => (),
|
||||
}
|
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if self.run_race() {
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return true;
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}
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||||
|
||||
if let Some(plan) = new_plan {
|
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mem::replace(self, plan);
|
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true
|
||||
} else {
|
||||
false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
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#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
|
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pub struct Transaction<T> {
|
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pub struct Transaction {
|
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pub from: PublicKey,
|
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pub plan: Plan<T>,
|
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pub asset: T,
|
||||
pub plan: Plan,
|
||||
pub asset: i64,
|
||||
pub last_id: Hash,
|
||||
pub sig: Signature,
|
||||
}
|
||||
|
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impl<T: Serialize + Clone + Eq> Transaction<T> {
|
||||
pub fn new(from_keypair: &KeyPair, to: PublicKey, asset: T, last_id: Hash) -> Self {
|
||||
impl Transaction {
|
||||
pub fn new(from_keypair: &KeyPair, to: PublicKey, asset: i64, last_id: Hash) -> Self {
|
||||
let from = from_keypair.pubkey();
|
||||
let plan = Plan::Action(Action::Pay(Payment {
|
||||
asset: asset.clone(),
|
||||
to,
|
||||
}));
|
||||
let plan = Plan::Action(Action::Pay(Payment { asset, to }));
|
||||
let mut tr = Transaction {
|
||||
from,
|
||||
plan,
|
||||
|
@ -157,25 +34,16 @@ impl<T: Serialize + Clone + Eq> Transaction<T> {
|
|||
from_keypair: &KeyPair,
|
||||
to: PublicKey,
|
||||
dt: DateTime<Utc>,
|
||||
asset: T,
|
||||
asset: i64,
|
||||
last_id: Hash,
|
||||
) -> Self {
|
||||
let from = from_keypair.pubkey();
|
||||
let plan = Plan::Race(
|
||||
Box::new(Plan::After(
|
||||
Condition::Timestamp(dt),
|
||||
Action::Pay(Payment {
|
||||
asset: asset.clone(),
|
||||
to,
|
||||
}),
|
||||
)),
|
||||
Box::new(Plan::After(
|
||||
(Condition::Timestamp(dt), Action::Pay(Payment { asset, to })),
|
||||
(
|
||||
Condition::Signature(from),
|
||||
Action::Pay(Payment {
|
||||
asset: asset.clone(),
|
||||
to: from,
|
||||
}),
|
||||
)),
|
||||
Action::Pay(Payment { asset, to: from }),
|
||||
),
|
||||
);
|
||||
let mut tr = Transaction {
|
||||
from,
|
||||
|
@ -198,7 +66,7 @@ impl<T: Serialize + Clone + Eq> Transaction<T> {
|
|||
}
|
||||
|
||||
pub fn verify(&self) -> bool {
|
||||
self.sig.verify(&self.from, &self.get_sign_data()) && self.plan.verify(&self.asset)
|
||||
self.sig.verify(&self.from, &self.get_sign_data()) && self.plan.verify(self.asset)
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -206,14 +74,12 @@ impl<T: Serialize + Clone + Eq> Transaction<T> {
|
|||
mod tests {
|
||||
use super::*;
|
||||
use bincode::{deserialize, serialize};
|
||||
use hash::hash;
|
||||
|
||||
#[test]
|
||||
fn test_claim() {
|
||||
let keypair = KeyPair::new();
|
||||
let asset = hash(b"hello, world");
|
||||
let zero = Hash::default();
|
||||
let tr0 = Transaction::new(&keypair, keypair.pubkey(), asset, zero);
|
||||
let tr0 = Transaction::new(&keypair, keypair.pubkey(), 42, zero);
|
||||
assert!(tr0.verify());
|
||||
}
|
||||
|
||||
|
@ -223,8 +89,7 @@ mod tests {
|
|||
let keypair0 = KeyPair::new();
|
||||
let keypair1 = KeyPair::new();
|
||||
let pubkey1 = keypair1.pubkey();
|
||||
let asset = hash(b"hello, world");
|
||||
let tr0 = Transaction::new(&keypair0, pubkey1, asset, zero);
|
||||
let tr0 = Transaction::new(&keypair0, pubkey1, 42, zero);
|
||||
assert!(tr0.verify());
|
||||
}
|
||||
|
||||
|
@ -237,12 +102,12 @@ mod tests {
|
|||
let claim0 = Transaction {
|
||||
from: Default::default(),
|
||||
plan,
|
||||
asset: 0u8,
|
||||
asset: 0,
|
||||
last_id: Default::default(),
|
||||
sig: Default::default(),
|
||||
};
|
||||
let buf = serialize(&claim0).unwrap();
|
||||
let claim1: Transaction<u8> = deserialize(&buf).unwrap();
|
||||
let claim1: Transaction = deserialize(&buf).unwrap();
|
||||
assert_eq!(claim1, claim0);
|
||||
}
|
||||
|
||||
|
@ -251,9 +116,9 @@ mod tests {
|
|||
let zero = Hash::default();
|
||||
let keypair = KeyPair::new();
|
||||
let pubkey = keypair.pubkey();
|
||||
let mut tr = Transaction::new(&keypair, pubkey, hash(b"hello, world"), zero);
|
||||
let mut tr = Transaction::new(&keypair, pubkey, 42, zero);
|
||||
tr.sign(&keypair);
|
||||
tr.asset = hash(b"goodbye cruel world"); // <-- attack!
|
||||
tr.asset = 1_000_000; // <-- attack!
|
||||
assert!(!tr.verify());
|
||||
}
|
||||
|
||||
|
@ -264,8 +129,7 @@ mod tests {
|
|||
let thief_keypair = KeyPair::new();
|
||||
let pubkey1 = keypair1.pubkey();
|
||||
let zero = Hash::default();
|
||||
let asset = hash(b"hello, world");
|
||||
let mut tr = Transaction::new(&keypair0, pubkey1, asset, zero);
|
||||
let mut tr = Transaction::new(&keypair0, pubkey1, 42, zero);
|
||||
tr.sign(&keypair0);
|
||||
if let Plan::Action(Action::Pay(ref mut payment)) = tr.plan {
|
||||
payment.to = thief_keypair.pubkey(); // <-- attack!
|
||||
|
|
Loading…
Reference in New Issue