128 lines
3.8 KiB
Rust
128 lines
3.8 KiB
Rust
use futures::{Async, Future, Poll};
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use io::{read_header, read_payload, ReadHeader, ReadPayload};
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use std::io;
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use std::marker::PhantomData;
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use tokio_io::AsyncRead;
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use zebra_message::{Error, MessageResult, Payload};
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use zebra_network::Magic;
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pub fn read_message<M, A>(a: A, magic: Magic, version: u32) -> ReadMessage<M, A>
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where
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A: AsyncRead,
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M: Payload,
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{
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ReadMessage {
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state: ReadMessageState::ReadHeader {
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version: version,
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future: read_header(a, magic),
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},
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message_type: PhantomData,
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}
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}
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enum ReadMessageState<M, A> {
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ReadHeader { version: u32, future: ReadHeader<A> },
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ReadPayload { future: ReadPayload<M, A> },
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}
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pub struct ReadMessage<M, A> {
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state: ReadMessageState<M, A>,
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message_type: PhantomData<M>,
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}
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impl<M, A> Future for ReadMessage<M, A>
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where
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A: AsyncRead,
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M: Payload,
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{
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type Item = (A, MessageResult<M>);
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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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loop {
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let next_state = match self.state {
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ReadMessageState::ReadHeader {
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version,
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ref mut future,
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} => {
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let (read, header) = try_ready!(future.poll());
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let header = match header {
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Ok(header) => header,
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Err(err) => return Ok((read, Err(err)).into()),
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};
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if header.command != M::command() {
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return Ok((read, Err(Error::InvalidCommand)).into());
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}
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let future = read_payload(read, version, header.len as usize, header.checksum);
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ReadMessageState::ReadPayload { future: future }
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}
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ReadMessageState::ReadPayload { ref mut future } => {
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let (read, payload) = try_ready!(future.poll());
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return Ok(Async::Ready((read, payload)));
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}
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};
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self.state = next_state;
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::read_message;
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use bytes::Bytes;
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use futures::Future;
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use zebra_message::types::{Ping, Pong};
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use zebra_message::Error;
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use zebra_network::Network;
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#[test]
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fn test_read_message() {
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let raw: Bytes = "24e9276470696e6700000000000000000800000083c00c765845303b6da97786".into();
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let ping = Ping::new(u64::from_str_radix("8677a96d3b304558", 16).unwrap());
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assert_eq!(
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read_message(raw.as_ref(), Network::Mainnet.magic(), 0)
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.wait()
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.unwrap()
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.1,
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Ok(ping)
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);
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assert_eq!(
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read_message::<Ping, _>(raw.as_ref(), Network::Testnet.magic(), 0)
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.wait()
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.unwrap()
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.1,
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Err(Error::InvalidMagic)
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);
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assert_eq!(
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read_message::<Pong, _>(raw.as_ref(), Network::Mainnet.magic(), 0)
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.wait()
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.unwrap()
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.1,
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Err(Error::InvalidCommand)
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);
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}
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#[test]
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fn test_read_too_short_message() {
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let raw: Bytes = "24e9276470696e6700000000000000000800000083c00c765845303b6da977".into();
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assert!(
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read_message::<Ping, _>(raw.as_ref(), Network::Mainnet.magic(), 0)
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.wait()
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.is_err()
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);
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}
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#[test]
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fn test_read_message_with_invalid_checksum() {
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let raw: Bytes = "24e9276470696e6700000000000000000800000083c01c765845303b6da97786".into();
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assert_eq!(
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read_message::<Ping, _>(raw.as_ref(), Network::Mainnet.magic(), 0)
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.wait()
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.unwrap()
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.1,
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Err(Error::InvalidChecksum)
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);
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}
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}
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