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use std::io; use std::marker::PhantomData; use futures::{Poll, Future, Async}; use tokio_io::AsyncRead; use network::Magic; use message::{MessageResult, Error, Payload}; use io::{read_header, ReadHeader, read_payload, ReadPayload}; pub fn read_message<M, A>(a: A, magic: Magic, version: u32) -> ReadMessage<M, A> where A: AsyncRead, M: Payload { ReadMessage { state: ReadMessageState::ReadHeader { version: version, future: read_header(a, magic), }, message_type: PhantomData } } enum ReadMessageState<M, A> { ReadHeader { version: u32, future: ReadHeader<A>, }, ReadPayload { future: ReadPayload<M, A>, }, } pub struct ReadMessage<M, A> { state: ReadMessageState<M, A>, message_type: PhantomData<M>, } impl<M, A> Future for ReadMessage<M, A> where A: AsyncRead, M: Payload { type Item = (A, MessageResult<M>); type Error = io::Error; fn poll(&mut self) -> Poll<Self::Item, Self::Error> { loop { let next_state = match self.state { ReadMessageState::ReadHeader { version, 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()), }; if header.command != M::command() { return Ok((read, Err(Error::InvalidCommand)).into()); } let future = read_payload( read, version, header.len as usize, header.checksum, ); ReadMessageState::ReadPayload { future: future, } }, ReadMessageState::ReadPayload { ref mut future } => { let (read, payload) = try_ready!(future.poll()); return Ok(Async::Ready((read, payload))); }, }; self.state = next_state; } } } #[cfg(test)] mod tests { use futures::Future; use bytes::Bytes; use network::{Network, ConsensusFork}; use message::Error; use message::types::{Ping, Pong}; use super::read_message; #[test] fn test_read_message() { let raw: Bytes = "f9beb4d970696e6700000000000000000800000083c00c765845303b6da97786".into(); let ping = Ping::new(u64::from_str_radix("8677a96d3b304558", 16).unwrap()); assert_eq!(read_message(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore), 0).wait().unwrap().1, Ok(ping)); assert_eq!(read_message::<Ping, _>(raw.as_ref(), Network::Testnet.magic(&ConsensusFork::BitcoinCore), 0).wait().unwrap().1, Err(Error::InvalidMagic)); assert_eq!(read_message::<Pong, _>(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore), 0).wait().unwrap().1, Err(Error::InvalidCommand)); } #[test] fn test_read_too_short_message() { let raw: Bytes = "f9beb4d970696e6700000000000000000800000083c00c765845303b6da977".into(); assert!(read_message::<Ping, _>(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore), 0).wait().is_err()); } #[test] fn test_read_message_with_invalid_checksum() { let raw: Bytes = "f9beb4d970696e6700000000000000000800000083c01c765845303b6da97786".into(); assert_eq!(read_message::<Ping, _>(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore), 0).wait().unwrap().1, Err(Error::InvalidChecksum)); } }