2018-02-23 13:08:19 -08:00
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//! The `accountant` is a client of the `historian`. It uses the historian's
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//! event log to record transactions. Its users can deposit funds and
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//! transfer funds to other users.
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2018-03-02 07:43:54 -08:00
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use log::{Entry, Sha256Hash};
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use event::{Event, PublicKey, Signature};
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2018-02-23 13:08:19 -08:00
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use historian::Historian;
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use ring::signature::Ed25519KeyPair;
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use std::sync::mpsc::{RecvError, SendError};
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use std::collections::HashMap;
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pub struct Accountant {
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pub historian: Historian<u64>,
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pub balances: HashMap<PublicKey, u64>,
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pub end_hash: Sha256Hash,
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}
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impl Accountant {
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pub fn new(start_hash: &Sha256Hash, ms_per_tick: Option<u64>) -> Self {
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let hist = Historian::<u64>::new(start_hash, ms_per_tick);
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Accountant {
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historian: hist,
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balances: HashMap::new(),
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end_hash: *start_hash,
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}
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}
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2018-02-28 17:04:35 -08:00
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pub fn process_event(self: &mut Self, event: &Event<u64>) {
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match *event {
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2018-03-01 16:44:10 -08:00
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Event::Claim { key, data, .. } => {
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2018-02-23 13:08:19 -08:00
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if self.balances.contains_key(&key) {
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if let Some(x) = self.balances.get_mut(&key) {
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*x += data;
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}
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} else {
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self.balances.insert(key, data);
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}
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}
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2018-03-01 16:44:10 -08:00
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Event::Transaction { from, to, data, .. } => {
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2018-02-23 13:08:19 -08:00
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if let Some(x) = self.balances.get_mut(&from) {
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*x -= data;
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}
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if self.balances.contains_key(&to) {
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if let Some(x) = self.balances.get_mut(&to) {
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*x += data;
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}
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} else {
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self.balances.insert(to, data);
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}
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}
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_ => (),
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}
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}
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2018-03-01 11:23:27 -08:00
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pub fn sync(self: &mut Self) -> Vec<Entry<u64>> {
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2018-02-28 17:04:35 -08:00
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let mut entries = vec![];
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2018-02-23 13:08:19 -08:00
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while let Ok(entry) = self.historian.receiver.try_recv() {
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2018-02-28 17:04:35 -08:00
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entries.push(entry);
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}
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2018-03-02 07:51:27 -08:00
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2018-02-28 17:04:35 -08:00
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if let Some(last_entry) = entries.last() {
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self.end_hash = last_entry.end_hash;
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}
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2018-03-02 07:51:27 -08:00
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2018-02-28 17:04:35 -08:00
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for e in &entries {
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self.process_event(&e.event);
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2018-02-23 13:08:19 -08:00
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}
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2018-03-01 11:23:27 -08:00
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entries
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2018-02-23 13:08:19 -08:00
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}
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2018-02-28 09:07:54 -08:00
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pub fn deposit_signed(
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self: &Self,
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key: PublicKey,
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data: u64,
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sig: Signature,
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) -> Result<(), SendError<Event<u64>>> {
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let event = Event::Claim { key, data, sig };
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self.historian.sender.send(event)
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}
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2018-02-23 13:08:19 -08:00
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pub fn deposit(
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self: &Self,
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n: u64,
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keypair: &Ed25519KeyPair,
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2018-03-01 11:23:27 -08:00
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) -> Result<Signature, SendError<Event<u64>>> {
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2018-03-02 07:43:54 -08:00
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use event::{get_pubkey, sign_serialized};
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2018-02-28 09:07:54 -08:00
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let key = get_pubkey(keypair);
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let sig = sign_serialized(&n, keypair);
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2018-03-01 11:23:27 -08:00
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self.deposit_signed(key, n, sig).map(|_| sig)
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2018-02-28 09:07:54 -08:00
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}
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pub fn transfer_signed(
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self: &mut Self,
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from: PublicKey,
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to: PublicKey,
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data: u64,
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sig: Signature,
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) -> Result<(), SendError<Event<u64>>> {
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if self.get_balance(&from).unwrap() < data {
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2018-02-28 13:16:50 -08:00
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// TODO: Replace the SendError result with a custom one.
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2018-02-28 17:04:35 -08:00
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println!("Error: Insufficient funds");
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2018-02-28 09:07:54 -08:00
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return Ok(());
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}
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let event = Event::Transaction {
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from,
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to,
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data,
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sig,
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};
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2018-02-23 13:08:19 -08:00
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self.historian.sender.send(event)
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}
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pub fn transfer(
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self: &mut Self,
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n: u64,
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keypair: &Ed25519KeyPair,
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2018-02-28 09:07:54 -08:00
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to: PublicKey,
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2018-03-01 11:23:27 -08:00
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) -> Result<Signature, SendError<Event<u64>>> {
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2018-03-02 07:43:54 -08:00
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use event::{get_pubkey, sign_transaction_data};
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2018-02-23 13:08:19 -08:00
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2018-02-28 09:07:54 -08:00
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let from = get_pubkey(keypair);
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let sig = sign_transaction_data(&n, keypair, &to);
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2018-03-01 11:23:27 -08:00
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self.transfer_signed(from, to, n, sig).map(|_| sig)
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2018-02-23 13:08:19 -08:00
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}
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pub fn get_balance(self: &mut Self, pubkey: &PublicKey) -> Result<u64, RecvError> {
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self.sync();
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Ok(*self.balances.get(pubkey).unwrap_or(&0))
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}
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2018-03-01 11:23:27 -08:00
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pub fn wait_on_signature(self: &mut Self, wait_sig: &Signature) {
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use std::thread::sleep;
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use std::time::Duration;
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let mut entries = self.sync();
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let mut found = false;
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while !found {
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found = entries.iter().any(|e| match e.event {
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Event::Claim { sig, .. } => sig == *wait_sig,
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Event::Transaction { sig, .. } => sig == *wait_sig,
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_ => false,
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});
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if !found {
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sleep(Duration::from_millis(30));
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entries = self.sync();
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}
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}
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}
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2018-02-23 13:08:19 -08:00
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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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2018-03-02 07:43:54 -08:00
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use event::{generate_keypair, get_pubkey};
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2018-02-23 13:08:19 -08:00
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use historian::ExitReason;
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#[test]
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fn test_accountant() {
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let zero = Sha256Hash::default();
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let mut acc = Accountant::new(&zero, Some(2));
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let alice_keypair = generate_keypair();
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let bob_keypair = generate_keypair();
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acc.deposit(10_000, &alice_keypair).unwrap();
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2018-03-01 11:23:27 -08:00
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let sig = acc.deposit(1_000, &bob_keypair).unwrap();
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acc.wait_on_signature(&sig);
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2018-02-23 13:08:19 -08:00
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2018-02-28 09:07:54 -08:00
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let bob_pubkey = get_pubkey(&bob_keypair);
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2018-03-01 11:23:27 -08:00
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let sig = acc.transfer(500, &alice_keypair, bob_pubkey).unwrap();
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acc.wait_on_signature(&sig);
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2018-02-23 13:08:19 -08:00
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assert_eq!(acc.get_balance(&bob_pubkey).unwrap(), 1_500);
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drop(acc.historian.sender);
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assert_eq!(
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acc.historian.thread_hdl.join().unwrap().1,
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ExitReason::RecvDisconnected
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);
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}
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2018-02-27 10:28:10 -08:00
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#[test]
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fn test_invalid_transfer() {
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2018-03-01 11:23:27 -08:00
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use std::thread::sleep;
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use std::time::Duration;
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2018-02-27 10:28:10 -08:00
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let zero = Sha256Hash::default();
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let mut acc = Accountant::new(&zero, Some(2));
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let alice_keypair = generate_keypair();
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let bob_keypair = generate_keypair();
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acc.deposit(10_000, &alice_keypair).unwrap();
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2018-03-01 11:23:27 -08:00
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let sig = acc.deposit(1_000, &bob_keypair).unwrap();
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acc.wait_on_signature(&sig);
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2018-02-27 10:28:10 -08:00
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2018-02-28 09:07:54 -08:00
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let bob_pubkey = get_pubkey(&bob_keypair);
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2018-02-27 10:28:10 -08:00
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acc.transfer(10_001, &alice_keypair, bob_pubkey).unwrap();
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sleep(Duration::from_millis(30));
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2018-03-01 11:23:27 -08:00
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2018-02-28 09:07:54 -08:00
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let alice_pubkey = get_pubkey(&alice_keypair);
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2018-02-27 10:28:10 -08:00
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assert_eq!(acc.get_balance(&alice_pubkey).unwrap(), 10_000);
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assert_eq!(acc.get_balance(&bob_pubkey).unwrap(), 1_000);
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drop(acc.historian.sender);
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assert_eq!(
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acc.historian.thread_hdl.join().unwrap().1,
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ExitReason::RecvDisconnected
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);
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}
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#[test]
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2018-02-28 09:07:54 -08:00
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fn test_multiple_claims() {
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2018-02-27 10:28:10 -08:00
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let zero = Sha256Hash::default();
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let mut acc = Accountant::new(&zero, Some(2));
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let keypair = generate_keypair();
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acc.deposit(1, &keypair).unwrap();
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2018-03-01 11:23:27 -08:00
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let sig = acc.deposit(2, &keypair).unwrap();
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acc.wait_on_signature(&sig);
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2018-02-27 10:28:10 -08:00
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2018-02-28 09:07:54 -08:00
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let pubkey = get_pubkey(&keypair);
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2018-02-27 10:28:10 -08:00
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assert_eq!(acc.get_balance(&pubkey).unwrap(), 3);
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drop(acc.historian.sender);
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assert_eq!(
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acc.historian.thread_hdl.join().unwrap().1,
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ExitReason::RecvDisconnected
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);
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}
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#[test]
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fn test_transfer_to_newb() {
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let zero = Sha256Hash::default();
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let mut acc = Accountant::new(&zero, Some(2));
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let alice_keypair = generate_keypair();
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let bob_keypair = generate_keypair();
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2018-03-01 11:23:27 -08:00
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let sig = acc.deposit(10_000, &alice_keypair).unwrap();
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acc.wait_on_signature(&sig);
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2018-02-27 10:28:10 -08:00
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2018-02-28 09:07:54 -08:00
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let bob_pubkey = get_pubkey(&bob_keypair);
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2018-03-01 11:23:27 -08:00
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let sig = acc.transfer(500, &alice_keypair, bob_pubkey).unwrap();
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acc.wait_on_signature(&sig);
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2018-02-27 10:28:10 -08:00
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assert_eq!(acc.get_balance(&bob_pubkey).unwrap(), 500);
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drop(acc.historian.sender);
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assert_eq!(
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acc.historian.thread_hdl.join().unwrap().1,
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ExitReason::RecvDisconnected
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);
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}
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2018-02-23 13:08:19 -08:00
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}
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