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use std::io; use futures::{Future, Poll, Async}; use tokio_io::io::{read_exact, ReadExact}; use tokio_io::AsyncRead; use crypto::checksum; use network::Magic; use message::{Error, MessageHeader, MessageResult, Command}; use bytes::Bytes; use io::{read_header, ReadHeader}; pub fn read_any_message<A>(a: A, magic: Magic) -> ReadAnyMessage<A> where A: AsyncRead { ReadAnyMessage { state: ReadAnyMessageState::ReadHeader(read_header(a, magic)), } } pub enum ReadAnyMessageState<A> { ReadHeader(ReadHeader<A>), ReadPayload { header: MessageHeader, future: ReadExact<A, Bytes> }, } pub struct ReadAnyMessage<A> { state: ReadAnyMessageState<A>, } impl<A> Future for ReadAnyMessage<A> where A: AsyncRead { type Item = MessageResult<(Command, Bytes)>; type Error = io::Error; fn poll(&mut self) -> Poll<Self::Item, Self::Error> { loop { let next_state = match self.state { ReadAnyMessageState::ReadHeader(ref mut header) => { let (stream, header) = try_ready!(header.poll()); let header = match header { Ok(header) => header, Err(err) => return Ok(Err(err).into()), }; ReadAnyMessageState::ReadPayload { future: read_exact(stream, Bytes::new_with_len(header.len as usize)), header: header, } }, ReadAnyMessageState::ReadPayload { ref mut header, ref mut future } => { let (_stream, bytes) = try_ready!(future.poll()); if checksum(&bytes) != header.checksum { return Ok(Err(Error::InvalidChecksum).into()); } return Ok(Async::Ready(Ok((header.command.clone(), bytes)))); }, }; self.state = next_state; } } } #[cfg(test)] mod tests { use futures::Future; use bytes::Bytes; use network::{Network, ConsensusFork}; use message::Error; use super::read_any_message; #[test] fn test_read_any_message() { let raw: Bytes = "f9beb4d970696e6700000000000000000800000083c00c765845303b6da97786".into(); let name = "ping".into(); let nonce = "5845303b6da97786".into(); let expected = (name, nonce); assert_eq!(read_any_message(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore)).wait().unwrap(), Ok(expected)); assert_eq!(read_any_message(raw.as_ref(), Network::Testnet.magic(&ConsensusFork::BitcoinCore)).wait().unwrap(), Err(Error::InvalidMagic)); } #[test] fn test_read_too_short_any_message() { let raw: Bytes = "f9beb4d970696e6700000000000000000800000083c00c765845303b6da977".into(); assert!(read_any_message(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore)).wait().is_err()); } #[test] fn test_read_any_message_with_invalid_checksum() { let raw: Bytes = "f9beb4d970696e6700000000000000000800000083c01c765845303b6da97786".into(); assert_eq!(read_any_message(raw.as_ref(), Network::Mainnet.magic(&ConsensusFork::BitcoinCore)).wait().unwrap(), Err(Error::InvalidChecksum)); } }