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Merge pull request #56 from garious/add-conditions

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Add conditions to transactions
This commit is contained in:
Greg Fitzgerald
2018-03-08 11:15:31 -07:00
committed by GitHub
parent dba6d7a8a6 ad6665c8b6
commit a86be9ebf2
6 changed files with 260 additions and 12 deletions
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3
Cargo.toml
View File

@@ -1,7 +1,7 @@
[package]
name = "silk"
description = "A silky smooth implementation of the Loom architecture"
version = "0.3.0"
version = "0.3.1"
documentation = "https://docs.rs/silk"
homepage = "http://loomprotocol.com/"
repository = "https://github.com/loomprotocol/silk"
@@ -53,3 +53,4 @@ serde_json = "1.0.10"
ring = "0.12.1"
untrusted = "0.5.1"
bincode = "1.0.0"
chrono = { version = "0.4.0", features = ["serde"] }

182
src/accountant.rs
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@@ -5,13 +5,14 @@
use hash::Hash;
use entry::Entry;
use event::Event;
use transaction::Transaction;
use transaction::{Condition, Transaction};
use signature::{KeyPair, PublicKey, Signature};
use mint::Mint;
use historian::{reserve_signature, Historian};
use std::sync::mpsc::SendError;
use std::collections::HashMap;
use std::collections::{HashMap, HashSet};
use std::result;
use chrono::prelude::*;
#[derive(Debug, PartialEq, Eq)]
pub enum AccountingError {
@@ -28,6 +29,9 @@ pub struct Accountant {
pub balances: HashMap<PublicKey, i64>,
pub first_id: Hash,
pub last_id: Hash,
pending: HashMap<Signature, Transaction<i64>>,
time_sources: HashSet<PublicKey>,
last_time: DateTime<Utc>,
}
impl Accountant {
@@ -48,6 +52,9 @@ impl Accountant {
balances: HashMap::new(),
first_id: start_hash,
last_id: start_hash,
pending: HashMap::new(),
time_sources: HashSet::new(),
last_time: Utc.timestamp(0, 0),
};
// The second item in the log is a special transaction where the to and from
@@ -94,6 +101,24 @@ impl Accountant {
Ok(())
}
/// Commit funds to the 'to' party.
fn complete_transaction(self: &mut Self, tr: &Transaction<i64>) {
if self.balances.contains_key(&tr.to) {
if let Some(x) = self.balances.get_mut(&tr.to) {
*x += tr.asset;
}
} else {
self.balances.insert(tr.to, tr.asset);
}
}
/// Return funds to the 'from' party.
fn cancel_transaction(self: &mut Self, tr: &Transaction<i64>) {
if let Some(x) = self.balances.get_mut(&tr.from) {
*x += tr.asset;
}
}
fn process_verified_transaction(
self: &mut Self,
tr: &Transaction<i64>,
@@ -103,18 +128,97 @@ impl Accountant {
return Err(AccountingError::InvalidTransferSignature);
}
if !tr.unless_any.is_empty() {
// TODO: Check to see if the transaction is expired.
}
if !Self::is_deposit(allow_deposits, &tr.from, &tr.to) {
if let Some(x) = self.balances.get_mut(&tr.from) {
*x -= tr.asset;
}
}
if self.balances.contains_key(&tr.to) {
if let Some(x) = self.balances.get_mut(&tr.to) {
*x += tr.asset;
if !tr.if_all.is_empty() {
self.pending.insert(tr.sig, tr.clone());
return Ok(());
}
self.complete_transaction(tr);
Ok(())
}
fn process_verified_sig(&mut self, from: PublicKey, tx_sig: Signature) -> Result<()> {
let mut cancel = false;
if let Some(tr) = self.pending.get(&tx_sig) {
// Cancel:
// if Signature(from) is in unless_any, return funds to tx.from, and remove the tx from this map.
// TODO: Use find().
for cond in &tr.unless_any {
if let Condition::Signature(pubkey) = *cond {
if from == pubkey {
cancel = true;
break;
}
}
}
}
if cancel {
if let Some(tr) = self.pending.remove(&tx_sig) {
self.cancel_transaction(&tr);
}
}
// Process Multisig:
// otherwise, if "Signature(from) is in if_all, remove it. If that causes that list
// to be empty, add the asset to to, and remove the tx from this map.
Ok(())
}
fn process_verified_timestamp(&mut self, from: PublicKey, dt: DateTime<Utc>) -> Result<()> {
// If this is the first timestamp we've seen, it probably came from the genesis block,
// so we'll trust it.
if self.last_time == Utc.timestamp(0, 0) {
self.time_sources.insert(from);
}
if self.time_sources.contains(&from) {
if dt > self.last_time {
self.last_time = dt;
}
} else {
self.balances.insert(tr.to, tr.asset);
return Ok(());
}
// TODO: Lookup pending Transaction waiting on time, signed by a whitelisted PublicKey.
// Expire:
// if a Timestamp after this DateTime is in unless_any, return funds to tx.from,
// and remove the tx from this map.
// Check to see if any timelocked transactions can be completed.
let mut completed = vec![];
for (key, tr) in &self.pending {
for cond in &tr.if_all {
if let Condition::Timestamp(dt) = *cond {
if self.last_time >= dt {
if tr.if_all.len() == 1 {
completed.push(*key);
}
}
}
}
// TODO: Add this in once we start removing constraints
//if tr.if_all.is_empty() {
// // TODO: Remove tr from pending
// self.complete_transaction(tr);
//}
}
for key in completed {
if let Some(tr) = self.pending.remove(&key) {
self.complete_transaction(&tr);
}
}
Ok(())
@@ -124,6 +228,8 @@ impl Accountant {
match *event {
Event::Tick => Ok(()),
Event::Transaction(ref tr) => self.process_verified_transaction(tr, allow_deposits),
Event::Signature { from, tx_sig, .. } => self.process_verified_sig(from, tx_sig),
Event::Timestamp { from, dt, .. } => self.process_verified_timestamp(from, dt),
}
}
@@ -138,6 +244,18 @@ impl Accountant {
self.process_transaction(tr).map(|_| sig)
}
pub fn transfer_on_date(
self: &mut Self,
n: i64,
keypair: &KeyPair,
to: PublicKey,
dt: DateTime<Utc>,
) -> Result<Signature> {
let tr = Transaction::new_on_date(keypair, to, dt, n, self.last_id);
let sig = tr.sig;
self.process_transaction(tr).map(|_| sig)
}
pub fn get_balance(self: &Self, pubkey: &PublicKey) -> Option<i64> {
self.balances.get(pubkey).map(|x| *x)
}
@@ -204,4 +322,56 @@ mod tests {
ExitReason::RecvDisconnected
);
}
#[test]
fn test_transfer_on_date() {
let alice = Mint::new(1);
let mut acc = Accountant::new(&alice, Some(2));
let alice_keypair = alice.keypair();
let bob_pubkey = KeyPair::new().pubkey();
let dt = Utc::now();
acc.transfer_on_date(1, &alice_keypair, bob_pubkey, dt)
.unwrap();
// Alice's balance will be zero because all funds are locked up.
assert_eq!(acc.get_balance(&alice.pubkey()), Some(0));
// Bob's balance will be None because the funds have not been
// sent.
assert_eq!(acc.get_balance(&bob_pubkey), None);
// Now, acknowledge the time in the condition occurred and
// that bob's funds are now available.
acc.process_verified_timestamp(alice.pubkey(), dt).unwrap();
assert_eq!(acc.get_balance(&bob_pubkey), Some(1));
acc.process_verified_timestamp(alice.pubkey(), dt).unwrap(); // <-- Attack! Attempt to process completed transaction.
assert_ne!(acc.get_balance(&bob_pubkey), Some(2));
}
#[test]
fn test_cancel_transfer() {
let alice = Mint::new(1);
let mut acc = Accountant::new(&alice, Some(2));
let alice_keypair = alice.keypair();
let bob_pubkey = KeyPair::new().pubkey();
let dt = Utc::now();
let sig = acc.transfer_on_date(1, &alice_keypair, bob_pubkey, dt)
.unwrap();
// Alice's balance will be zero because all funds are locked up.
assert_eq!(acc.get_balance(&alice.pubkey()), Some(0));
// Bob's balance will be None because the funds have not been
// sent.
assert_eq!(acc.get_balance(&bob_pubkey), None);
// Now, cancel the trancaction. Alice gets her funds back, Bob never sees them.
acc.process_verified_sig(alice.pubkey(), sig).unwrap();
assert_eq!(acc.get_balance(&alice.pubkey()), Some(1));
assert_eq!(acc.get_balance(&bob_pubkey), None);
acc.process_verified_sig(alice.pubkey(), sig).unwrap(); // <-- Attack! Attempt to cancel completed transaction.
assert_ne!(acc.get_balance(&alice.pubkey()), Some(2));
}
}

29
src/event.rs
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@@ -1,7 +1,9 @@
//! The `event` crate provides the data structures for log events.
use signature::Signature;
use signature::{KeyPair, KeyPairUtil, PublicKey, Signature, SignatureUtil};
use transaction::Transaction;
use chrono::prelude::*;
use bincode::serialize;
/// When 'event' is Tick, the event represents a simple clock tick, and exists for the
/// sole purpose of improving the performance of event log verification. A tick can
@@ -12,13 +14,36 @@ use transaction::Transaction;
pub enum Event {
Tick,
Transaction(Transaction<i64>),
Signature {
from: PublicKey,
tx_sig: Signature,
sig: Signature,
},
Timestamp {
from: PublicKey,
dt: DateTime<Utc>,
sig: Signature,
},
}
impl Event {
pub fn new_timestamp(from: &KeyPair, dt: DateTime<Utc>) -> Self {
let sign_data = serialize(&dt).unwrap();
let sig = Signature::clone_from_slice(from.sign(&sign_data).as_ref());
Event::Timestamp {
from: from.pubkey(),
dt,
sig,
}
}
// TODO: Rename this to transaction_signature().
pub fn get_signature(&self) -> Option<Signature> {
match *self {
Event::Tick => None,
Event::Transaction(ref tr) => Some(tr.sig),
Event::Signature { .. } => None,
Event::Timestamp { .. } => None,
}
}
@@ -26,6 +51,8 @@ impl Event {
match *self {
Event::Tick => true,
Event::Transaction(ref tr) => tr.verify(),
Event::Signature { from, tx_sig, sig } => sig.verify(&from, &tx_sig),
Event::Timestamp { from, dt, sig } => sig.verify(&from, &serialize(&dt).unwrap()),
}
}
}

1
src/lib.rs
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@@ -12,6 +12,7 @@ pub mod accountant;
pub mod accountant_skel;
pub mod accountant_stub;
extern crate bincode;
extern crate chrono;
extern crate generic_array;
extern crate rayon;
extern crate ring;

14
src/mint.rs
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@@ -12,6 +12,7 @@ use untrusted::Input;
#[derive(Serialize, Deserialize, Debug)]
pub struct Mint {
pub pkcs8: Vec<u8>,
pubkey: PublicKey,
pub tokens: i64,
}
@@ -19,7 +20,13 @@ impl Mint {
pub fn new(tokens: i64) -> Self {
let rnd = SystemRandom::new();
let pkcs8 = KeyPair::generate_pkcs8(&rnd).unwrap().to_vec();
Mint { pkcs8, tokens }
let keypair = KeyPair::from_pkcs8(Input::from(&pkcs8)).unwrap();
let pubkey = keypair.pubkey();
Mint {
pkcs8,
pubkey,
tokens,
}
}
pub fn seed(&self) -> Hash {
@@ -31,11 +38,12 @@ impl Mint {
}
pub fn pubkey(&self) -> PublicKey {
self.keypair().pubkey()
self.pubkey
}
pub fn create_events(&self) -> Vec<Event> {
let tr = Transaction::new(&self.keypair(), self.pubkey(), self.tokens, self.seed());
let keypair = self.keypair();
let tr = Transaction::new(&keypair, self.pubkey(), self.tokens, self.seed());
vec![Event::Tick, Event::Transaction(tr)]
}

43
src/transaction.rs
View File

@@ -4,11 +4,20 @@ use signature::{KeyPair, KeyPairUtil, PublicKey, Signature, SignatureUtil};
use serde::Serialize;
use bincode::serialize;
use hash::Hash;
use chrono::prelude::*;
#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub enum Condition {
Timestamp(DateTime<Utc>),
Signature(PublicKey),
}
#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub struct Transaction<T> {
pub from: PublicKey,
pub to: PublicKey,
pub if_all: Vec<Condition>,
pub unless_any: Vec<Condition>,
pub asset: T,
pub last_id: Hash,
pub sig: Signature,
@@ -19,6 +28,29 @@ impl<T: Serialize> Transaction<T> {
let mut tr = Transaction {
from: from_keypair.pubkey(),
to,
if_all: vec![],
unless_any: vec![],
asset,
last_id,
sig: Signature::default(),
};
tr.sign(from_keypair);
tr
}
pub fn new_on_date(
from_keypair: &KeyPair,
to: PublicKey,
dt: DateTime<Utc>,
asset: T,
last_id: Hash,
) -> Self {
let from = from_keypair.pubkey();
let mut tr = Transaction {
from,
to,
if_all: vec![Condition::Timestamp(dt)],
unless_any: vec![Condition::Signature(from)],
asset,
last_id,
sig: Signature::default(),
@@ -28,7 +60,14 @@ impl<T: Serialize> Transaction<T> {
}
fn get_sign_data(&self) -> Vec<u8> {
serialize(&(&self.from, &self.to, &self.asset, &self.last_id)).unwrap()
serialize(&(
&self.from,
&self.to,
&self.if_all,
&self.unless_any,
&self.asset,
&self.last_id,
)).unwrap()
}
pub fn sign(&mut self, keypair: &KeyPair) {
@@ -72,6 +111,8 @@ mod tests {
let claim0 = Transaction {
from: Default::default(),
to: Default::default(),
if_all: Default::default(),
unless_any: Default::default(),
asset: 0u8,
last_id: Default::default(),
sig: Default::default(),