88 lines
2.7 KiB
Rust
88 lines
2.7 KiB
Rust
// Copyright 2015-2017 Parity Technologies (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::io;
|
|
use futures::{Poll, Future, Async};
|
|
use tokio_io::AsyncRead;
|
|
use ethkey::KeyPair;
|
|
use key_server_cluster::Error;
|
|
use key_server_cluster::message::Message;
|
|
use key_server_cluster::io::{read_header, ReadHeader, read_payload, read_encrypted_payload, ReadPayload};
|
|
|
|
/// Create future for read single message from the stream.
|
|
pub fn read_message<A>(a: A) -> ReadMessage<A> where A: AsyncRead {
|
|
ReadMessage {
|
|
key: None,
|
|
state: ReadMessageState::ReadHeader(read_header(a)),
|
|
}
|
|
}
|
|
|
|
/// Create future for read single encrypted message from the stream.
|
|
pub fn read_encrypted_message<A>(a: A, key: KeyPair) -> ReadMessage<A> where A: AsyncRead {
|
|
ReadMessage {
|
|
key: Some(key),
|
|
state: ReadMessageState::ReadHeader(read_header(a)),
|
|
}
|
|
}
|
|
|
|
enum ReadMessageState<A> {
|
|
ReadHeader(ReadHeader<A>),
|
|
ReadPayload(ReadPayload<A>),
|
|
Finished,
|
|
}
|
|
|
|
/// Future for read single message from the stream.
|
|
pub struct ReadMessage<A> {
|
|
key: Option<KeyPair>,
|
|
state: ReadMessageState<A>,
|
|
}
|
|
|
|
impl<A> Future for ReadMessage<A> where A: AsyncRead {
|
|
type Item = (A, Result<Message, Error>);
|
|
type Error = io::Error;
|
|
|
|
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
|
|
let (next, result) = match self.state {
|
|
ReadMessageState::ReadHeader(ref mut future) => {
|
|
let (read, header) = try_ready!(future.poll());
|
|
let header = match header {
|
|
Ok(header) => header,
|
|
Err(err) => return Ok((read, Err(err)).into()),
|
|
};
|
|
|
|
let future = match self.key.take() {
|
|
Some(key) => read_encrypted_payload(read, header, key),
|
|
None => read_payload(read, header),
|
|
};
|
|
let next = ReadMessageState::ReadPayload(future);
|
|
(next, Async::NotReady)
|
|
},
|
|
ReadMessageState::ReadPayload(ref mut future) => {
|
|
let (read, payload) = try_ready!(future.poll());
|
|
(ReadMessageState::Finished, Async::Ready((read, payload)))
|
|
},
|
|
ReadMessageState::Finished => panic!("poll ReadMessage after it's done"),
|
|
};
|
|
|
|
self.state = next;
|
|
match result {
|
|
// by polling again, we register new future
|
|
Async::NotReady => self.poll(),
|
|
result => Ok(result)
|
|
}
|
|
}
|
|
}
|