66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::io;
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use futures::{Poll, Future};
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use tokio_io::AsyncRead;
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use tokio_io::io::{read_exact, ReadExact};
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use ethkey::KeyPair;
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use key_server_cluster::Error;
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use key_server_cluster::message::Message;
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use key_server_cluster::io::message::{MessageHeader, deserialize_message, decrypt_message};
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/// Create future for read single message payload from the stream.
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pub fn read_payload<A>(a: A, header: MessageHeader) -> ReadPayload<A> where A: AsyncRead {
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ReadPayload {
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reader: read_exact(a, vec![0; header.size as usize]),
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header: header,
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key: None,
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}
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}
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/// Create future for read single encrypted message payload from the stream.
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pub fn read_encrypted_payload<A>(a: A, header: MessageHeader, key: KeyPair) -> ReadPayload<A> where A: AsyncRead {
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ReadPayload {
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reader: read_exact(a, vec![0; header.size as usize]),
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header: header,
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key: Some(key),
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}
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}
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/// Future for read single message payload from the stream.
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pub struct ReadPayload<A> {
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reader: ReadExact<A, Vec<u8>>,
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header: MessageHeader,
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key: Option<KeyPair>,
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}
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impl<A> Future for ReadPayload<A> where A: AsyncRead {
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type Item = (A, Result<Message, Error>);
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type Error = io::Error;
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fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
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let (read, data) = try_ready!(self.reader.poll());
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let payload = if let Some(key) = self.key.take() {
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decrypt_message(&key, data)
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.and_then(|data| deserialize_message(&self.header, data))
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} else {
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deserialize_message(&self.header, data)
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};
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Ok((read, payload).into())
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}
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}
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