412 lines
12 KiB
Rust
412 lines
12 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
use std::thread;
|
|
use std::time::{Instant, Duration};
|
|
use std::sync::{mpsc, Arc};
|
|
use std::collections::BTreeMap;
|
|
use jsonrpc_core;
|
|
use util::{Mutex, RwLock, U256};
|
|
use v1::helpers::{ConfirmationRequest, ConfirmationPayload};
|
|
|
|
/// Result that can be returned from JSON RPC.
|
|
pub type RpcResult = Result<jsonrpc_core::Value, jsonrpc_core::Error>;
|
|
|
|
/// Possible events happening in the queue that can be listened to.
|
|
#[derive(Debug, PartialEq)]
|
|
pub enum QueueEvent {
|
|
/// Receiver should stop work upon receiving `Finish` message.
|
|
Finish,
|
|
/// Informs about new request.
|
|
NewRequest(U256),
|
|
/// Request rejected.
|
|
RequestRejected(U256),
|
|
/// Request resolved.
|
|
RequestConfirmed(U256),
|
|
}
|
|
|
|
/// Defines possible errors returned from queue receiving method.
|
|
#[derive(Debug, PartialEq)]
|
|
pub enum QueueError {
|
|
/// Returned when method has been already used (no receiver available).
|
|
AlreadyUsed,
|
|
/// Returned when receiver encounters an error.
|
|
ReceiverError(mpsc::RecvError),
|
|
}
|
|
|
|
/// Message Receiver type
|
|
pub type QueueEventReceiver = mpsc::Receiver<QueueEvent>;
|
|
|
|
/// A queue of transactions awaiting to be confirmed and signed.
|
|
pub trait SigningQueue: Send + Sync {
|
|
/// Add new request to the queue.
|
|
/// Returns a `ConfirmationPromise` that can be used to await for resolution of given request.
|
|
fn add_request(&self, request: ConfirmationPayload) -> ConfirmationPromise;
|
|
|
|
/// Removes a request from the queue.
|
|
/// Notifies possible token holders that request was rejected.
|
|
fn request_rejected(&self, id: U256) -> Option<ConfirmationRequest>;
|
|
|
|
/// Removes a request from the queue.
|
|
/// Notifies possible token holders that request was confirmed and given hash was assigned.
|
|
fn request_confirmed(&self, id: U256, result: RpcResult) -> Option<ConfirmationRequest>;
|
|
|
|
/// Returns a request if it is contained in the queue.
|
|
fn peek(&self, id: &U256) -> Option<ConfirmationRequest>;
|
|
|
|
/// Return copy of all the requests in the queue.
|
|
fn requests(&self) -> Vec<ConfirmationRequest>;
|
|
|
|
/// Returns number of requests awaiting confirmation.
|
|
fn len(&self) -> usize;
|
|
|
|
/// Returns true if there are no requests awaiting confirmation.
|
|
fn is_empty(&self) -> bool;
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq)]
|
|
/// Result of a pending confirmation request.
|
|
pub enum ConfirmationResult {
|
|
/// The request has not yet been confirmed nor rejected.
|
|
Waiting,
|
|
/// The request has been rejected.
|
|
Rejected,
|
|
/// The request has been confirmed.
|
|
Confirmed(RpcResult),
|
|
}
|
|
|
|
/// Time you need to confirm the request in UI.
|
|
/// This is the amount of time token holder will wait before
|
|
/// returning `None`.
|
|
/// Unless we have a multi-threaded RPC this will lock
|
|
/// any other incoming call!
|
|
const QUEUE_TIMEOUT_DURATION_SEC : u64 = 20;
|
|
|
|
/// A handle to submitted request.
|
|
/// Allows to block and wait for a resolution of that request.
|
|
pub struct ConfirmationToken {
|
|
result: Arc<Mutex<ConfirmationResult>>,
|
|
handle: thread::Thread,
|
|
request: ConfirmationRequest,
|
|
timeout: Duration,
|
|
}
|
|
|
|
pub struct ConfirmationPromise {
|
|
id: U256,
|
|
result: Arc<Mutex<ConfirmationResult>>,
|
|
timeout: Duration,
|
|
}
|
|
|
|
impl ConfirmationToken {
|
|
/// Submit solution to all listeners
|
|
fn resolve(&self, result: Option<RpcResult>) {
|
|
let mut res = self.result.lock();
|
|
*res = result.map_or(ConfirmationResult::Rejected, |h| ConfirmationResult::Confirmed(h));
|
|
// Notify listener
|
|
self.handle.unpark();
|
|
}
|
|
|
|
fn as_promise(&self) -> ConfirmationPromise {
|
|
ConfirmationPromise {
|
|
id: self.request.id,
|
|
result: self.result.clone(),
|
|
timeout: self.timeout,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ConfirmationPromise {
|
|
/// Get the ID for this request.
|
|
pub fn id(&self) -> U256 { self.id }
|
|
|
|
/// Blocks current thread and awaits for
|
|
/// resolution of the transaction (rejected / confirmed)
|
|
/// Returns `None` if transaction was rejected or timeout reached.
|
|
/// Returns `Some(result)` if transaction was confirmed.
|
|
pub fn wait_with_timeout(&self) -> Option<RpcResult> {
|
|
let res = self.wait_until(Instant::now() + self.timeout);
|
|
match res {
|
|
ConfirmationResult::Confirmed(h) => Some(h),
|
|
ConfirmationResult::Rejected | ConfirmationResult::Waiting => None,
|
|
}
|
|
}
|
|
|
|
/// Just get the result, assuming it exists.
|
|
pub fn result(&self) -> ConfirmationResult { self.wait_until(Instant::now()) }
|
|
|
|
/// Blocks current thread and awaits for
|
|
/// resolution of the request (rejected / confirmed)
|
|
/// Returns `None` if request was rejected or timeout reached.
|
|
/// Returns `Some(result)` if request was confirmed.
|
|
pub fn wait_until(&self, deadline: Instant) -> ConfirmationResult {
|
|
trace!(target: "own_tx", "Signer: Awaiting confirmation... ({:?}).", self.id);
|
|
loop {
|
|
let now = Instant::now();
|
|
// Check the result...
|
|
match *self.result.lock() {
|
|
// Waiting and deadline not yet passed continue looping.
|
|
ConfirmationResult::Waiting if now < deadline => {}
|
|
// Anything else - return.
|
|
ref a => return a.clone(),
|
|
}
|
|
// wait a while longer - maybe the solution will arrive.
|
|
thread::park_timeout(deadline - now);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Queue for all unconfirmed requests.
|
|
pub struct ConfirmationsQueue {
|
|
id: Mutex<U256>,
|
|
queue: RwLock<BTreeMap<U256, ConfirmationToken>>,
|
|
sender: Mutex<mpsc::Sender<QueueEvent>>,
|
|
receiver: Mutex<Option<mpsc::Receiver<QueueEvent>>>,
|
|
timeout: Duration,
|
|
}
|
|
|
|
impl Default for ConfirmationsQueue {
|
|
fn default() -> Self {
|
|
let (send, recv) = mpsc::channel();
|
|
|
|
ConfirmationsQueue {
|
|
id: Mutex::new(U256::from(0)),
|
|
queue: RwLock::new(BTreeMap::new()),
|
|
sender: Mutex::new(send),
|
|
receiver: Mutex::new(Some(recv)),
|
|
timeout: Duration::from_secs(QUEUE_TIMEOUT_DURATION_SEC),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ConfirmationsQueue {
|
|
#[cfg(test)]
|
|
/// Creates new confirmations queue with specified timeout
|
|
pub fn with_timeout(timeout: Duration) -> Self {
|
|
let mut queue = Self::default();
|
|
queue.timeout = timeout;
|
|
queue
|
|
}
|
|
|
|
/// Blocks the thread and starts listening for notifications regarding all actions in the queue.
|
|
/// For each event, `listener` callback will be invoked.
|
|
/// This method can be used only once (only single consumer of events can exist).
|
|
pub fn start_listening<F>(&self, listener: F) -> Result<(), QueueError>
|
|
where F: Fn(QueueEvent) -> () {
|
|
let recv = self.receiver.lock().take();
|
|
if let None = recv {
|
|
return Err(QueueError::AlreadyUsed);
|
|
}
|
|
let recv = recv.expect("Check for none is done earlier.");
|
|
|
|
loop {
|
|
let message = try!(recv.recv().map_err(|e| QueueError::ReceiverError(e)));
|
|
if let QueueEvent::Finish = message {
|
|
return Ok(());
|
|
}
|
|
|
|
listener(message);
|
|
}
|
|
}
|
|
|
|
/// Notifies consumer that the communcation is over.
|
|
/// No more events will be sent after this function is invoked.
|
|
pub fn finish(&self) {
|
|
self.notify(QueueEvent::Finish);
|
|
}
|
|
|
|
/// Notifies receiver about the event happening in this queue.
|
|
fn notify(&self, message: QueueEvent) {
|
|
// We don't really care about the result
|
|
let _ = self.sender.lock().send(message);
|
|
}
|
|
|
|
/// Removes requests from this queue and notifies `ConfirmationPromise` holders about the result.
|
|
/// Notifies also a receiver about that event.
|
|
fn remove(&self, id: U256, result: Option<RpcResult>) -> Option<ConfirmationRequest> {
|
|
let token = self.queue.write().remove(&id);
|
|
|
|
if let Some(token) = token {
|
|
// notify receiver about the event
|
|
self.notify(result.clone().map_or_else(
|
|
|| QueueEvent::RequestRejected(id),
|
|
|_| QueueEvent::RequestConfirmed(id)
|
|
));
|
|
// notify token holders about resolution
|
|
token.resolve(result);
|
|
// return a result
|
|
return Some(token.request.clone());
|
|
}
|
|
None
|
|
}
|
|
}
|
|
|
|
impl Drop for ConfirmationsQueue {
|
|
fn drop(&mut self) {
|
|
self.finish();
|
|
}
|
|
}
|
|
|
|
impl SigningQueue for ConfirmationsQueue {
|
|
fn add_request(&self, request: ConfirmationPayload) -> ConfirmationPromise {
|
|
// Increment id
|
|
let id = {
|
|
let mut last_id = self.id.lock();
|
|
*last_id = *last_id + U256::from(1);
|
|
*last_id
|
|
};
|
|
// Add request to queue
|
|
let res = {
|
|
debug!(target: "own_tx", "Signer: New entry ({:?}) in confirmation queue.", id);
|
|
trace!(target: "own_tx", "Signer: ({:?}) : {:?}", id, request);
|
|
|
|
let mut queue = self.queue.write();
|
|
queue.insert(id, ConfirmationToken {
|
|
result: Arc::new(Mutex::new(ConfirmationResult::Waiting)),
|
|
handle: thread::current(),
|
|
request: ConfirmationRequest {
|
|
id: id,
|
|
payload: request,
|
|
},
|
|
timeout: self.timeout,
|
|
});
|
|
queue.get(&id).map(|token| token.as_promise()).expect("Token was just inserted.")
|
|
};
|
|
// Notify listeners
|
|
self.notify(QueueEvent::NewRequest(id));
|
|
res
|
|
|
|
}
|
|
|
|
fn peek(&self, id: &U256) -> Option<ConfirmationRequest> {
|
|
self.queue.read().get(id).map(|token| token.request.clone())
|
|
}
|
|
|
|
fn request_rejected(&self, id: U256) -> Option<ConfirmationRequest> {
|
|
debug!(target: "own_tx", "Signer: Request rejected ({:?}).", id);
|
|
self.remove(id, None)
|
|
}
|
|
|
|
fn request_confirmed(&self, id: U256, result: RpcResult) -> Option<ConfirmationRequest> {
|
|
debug!(target: "own_tx", "Signer: Transaction confirmed ({:?}).", id);
|
|
self.remove(id, Some(result))
|
|
}
|
|
|
|
fn requests(&self) -> Vec<ConfirmationRequest> {
|
|
let queue = self.queue.read();
|
|
queue.values().map(|token| token.request.clone()).collect()
|
|
}
|
|
|
|
fn len(&self) -> usize {
|
|
let queue = self.queue.read();
|
|
queue.len()
|
|
}
|
|
|
|
fn is_empty(&self) -> bool {
|
|
let queue = self.queue.read();
|
|
queue.is_empty()
|
|
}
|
|
}
|
|
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use std::time::Duration;
|
|
use std::thread;
|
|
use std::sync::Arc;
|
|
use util::{Address, U256, H256, Mutex};
|
|
use v1::helpers::{SigningQueue, ConfirmationsQueue, QueueEvent, FilledTransactionRequest, ConfirmationPayload};
|
|
use v1::types::H256 as NH256;
|
|
use jsonrpc_core::to_value;
|
|
|
|
fn request() -> ConfirmationPayload {
|
|
ConfirmationPayload::Transaction(FilledTransactionRequest {
|
|
from: Address::from(1),
|
|
to: Some(Address::from(2)),
|
|
gas_price: 0.into(),
|
|
gas: 10_000.into(),
|
|
value: 10_000_000.into(),
|
|
data: vec![],
|
|
nonce: None,
|
|
})
|
|
}
|
|
|
|
#[test]
|
|
fn should_wait_for_hash() {
|
|
// given
|
|
let queue = Arc::new(ConfirmationsQueue::default());
|
|
let request = request();
|
|
|
|
// when
|
|
let q = queue.clone();
|
|
let handle = thread::spawn(move || {
|
|
let v = q.add_request(request);
|
|
v.wait_with_timeout().expect("Should return hash")
|
|
});
|
|
|
|
let id = U256::from(1);
|
|
while queue.peek(&id).is_none() {
|
|
// Just wait for the other thread to start
|
|
thread::sleep(Duration::from_millis(100));
|
|
}
|
|
queue.request_confirmed(id, to_value(&NH256::from(H256::from(1))));
|
|
|
|
// then
|
|
assert_eq!(handle.join().expect("Thread should finish nicely"), to_value(&NH256::from(H256::from(1))));
|
|
}
|
|
|
|
#[test]
|
|
fn should_receive_notification() {
|
|
// given
|
|
let received = Arc::new(Mutex::new(None));
|
|
let queue = Arc::new(ConfirmationsQueue::default());
|
|
let request = request();
|
|
|
|
// when
|
|
let q = queue.clone();
|
|
let r = received.clone();
|
|
let handle = thread::spawn(move || {
|
|
q.start_listening(move |notification| {
|
|
let mut v = r.lock();
|
|
*v = Some(notification);
|
|
}).expect("Should be closed nicely.")
|
|
});
|
|
queue.add_request(request);
|
|
queue.finish();
|
|
|
|
// then
|
|
handle.join().expect("Thread should finish nicely");
|
|
let r = received.lock().take();
|
|
assert_eq!(r, Some(QueueEvent::NewRequest(U256::from(1))));
|
|
}
|
|
|
|
#[test]
|
|
fn should_add_transactions() {
|
|
// given
|
|
let queue = ConfirmationsQueue::default();
|
|
let request = request();
|
|
|
|
// when
|
|
queue.add_request(request.clone());
|
|
let all = queue.requests();
|
|
|
|
// then
|
|
assert_eq!(all.len(), 1);
|
|
let el = all.get(0).unwrap();
|
|
assert_eq!(el.id, U256::from(1));
|
|
assert_eq!(el.payload, request);
|
|
}
|
|
}
|