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use std::io::{BufRead, Read, Write};
use byteorder::WriteBytesExt;
#[derive(Debug, Clone)]
pub struct Message {
pub event: lexpr::Value,
pub data: lexpr::Value,
}
pub struct Client {
reader: std::io::BufReader<std::net::TcpStream>,
buf: String,
}
impl Client {
pub fn new(addr: &str, subs: &[lexpr::Value]) -> Self {
let mut socket = std::net::TcpStream::connect(addr).expect("failed to connect to message bus");
socket.set_nonblocking(true).expect("failed to set message bus socket nonblocking");
for s in subs {
write!(socket, "(sub {})\n", s).expect("failed to send subscribe message to bus");
}
let reader = std::io::BufReader::new(socket);
Self { reader, buf: String::new(), }
}
pub fn pump(&mut self) -> Option<Message> {
match self.reader.read_line(&mut self.buf) {
Ok(l) => {
// log::info!("read line: {}", self.buf);
let mv = lexpr::from_str(&self.buf);
self.buf.clear();
match mv {
Ok(v) => {
match v.as_cons() {
Some(cs) => {
Some(Message { event: cs.car().clone(), data: cs.cdr().clone() })
},
_ => { log::error!("malformed message bus input s-expression: {}", v); None },
}
},
Err(e) => { log::error!("malformed message bus input line: {}", e); None },
}
},
Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {
// if self.buf.len() > 0 {
// log::error!("error wouldblock: buf is {}", self.buf);
// }
None
},
Err(e) => panic!("IO error on message bus: {}", e),
}
}
}
#[derive(Debug, Clone)]
pub struct BinaryMessage {
pub event: Vec<u8>,
pub data: Vec<u8>
}
#[derive(Debug, Clone)]
pub enum BinaryClientState {
PartialEventLength { buf_len: usize, buf: [u8; 4] },
PartialEvent { len: usize, buf_len: usize, buf: Vec<u8> },
PartialDataLength { event: Vec<u8>, buf_len: usize, buf: [u8; 4] },
PartialData { event: Vec<u8>, len: usize, buf_len: usize, buf: Vec<u8> },
Message { event: Vec<u8>, data: Vec<u8> },
}
impl Default for BinaryClientState {
fn default() -> Self {
Self::PartialEventLength { buf_len: 0, buf: [0; 4] }
}
}
pub struct BinaryClient {
state: BinaryClientState,
reader: std::io::BufReader<std::net::TcpStream>,
}
impl BinaryClient {
pub fn new(addr: &str, subs: &[&[u8]]) -> Self {
let mut socket = std::net::TcpStream::connect(addr).expect("failed to connect to message bus");
socket.set_nonblocking(true).expect("failed to set message bus socket nonblocking");
for s in subs {
write!(socket, "s").expect("failed to send subscribe message to bus");
socket.write_u32::<byteorder::LE>(s.len() as u32).expect("failed to send subscribe message length to bus");
socket.write_all(s).expect("failed to send subscribe message to bus");
}
socket.flush().expect("failed to flush bus connection");
let reader = std::io::BufReader::new(socket);
Self { state: BinaryClientState::PartialEventLength { buf_len: 0, buf: [0; 4] }, reader }
}
fn read(reader: &mut std::io::BufReader<std::net::TcpStream>, buf: &mut [u8]) -> Option<usize> {
match reader.read(buf) {
Ok(sz) => Some(sz),
Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {
None
},
Err(e) => panic!("IO error on message bus: {}", e),
}
}
fn update_state(
reader: &mut std::io::BufReader<std::net::TcpStream>,
mut state: BinaryClientState,
) -> BinaryClientState {
loop {
state = match state {
BinaryClientState::PartialEventLength { mut buf_len, mut buf } => {
buf_len += if let Some(x) = Self::read(reader, &mut buf[buf_len..]) {
x
} else { break BinaryClientState::PartialEventLength { buf_len, buf }; };
if buf_len == 4 {
let len = u32::from_le_bytes(buf) as usize;
BinaryClientState::PartialEvent {
len,
buf_len: 0,
buf: vec![0; len],
}
} else { BinaryClientState::PartialEventLength { buf_len, buf } }
},
BinaryClientState::PartialEvent { len, mut buf_len, mut buf } => {
buf_len += if let Some(x) = Self::read(reader, &mut buf[buf_len..]) {
x
} else { break BinaryClientState::PartialEvent { len, buf_len, buf }; };
if buf_len == len {
BinaryClientState::PartialDataLength {
event: buf.clone(),
buf_len: 0,
buf: [0; 4],
}
} else { BinaryClientState::PartialEvent { len, buf_len, buf } }
},
BinaryClientState::PartialDataLength { event, mut buf_len, mut buf } => {
buf_len += if let Some(x) = Self::read(reader, &mut buf[buf_len..]) {
x
} else { break BinaryClientState::PartialDataLength { event, buf_len, buf }; };
if buf_len == 4 {
let len = u32::from_le_bytes(buf) as usize;
BinaryClientState::PartialData {
event,
len,
buf_len: 0,
buf: vec![0; len],
}
} else { BinaryClientState::PartialDataLength { event, buf_len, buf } }
},
BinaryClientState::PartialData { event, len, mut buf_len, mut buf } => {
buf_len += if let Some(x) = Self::read(reader, &mut buf[buf_len..]) {
x
} else { break BinaryClientState::PartialData { event, len, buf_len, buf }; };
if buf_len == len {
BinaryClientState::Message {
event,
data: buf.clone(),
}
} else { BinaryClientState::PartialData { event, len, buf_len, buf } }
},
st@BinaryClientState::Message{..} => break st,
};
}
}
pub fn pump(&mut self) -> Option<BinaryMessage> {
self.state = Self::update_state(&mut self.reader, std::mem::take(&mut self.state));
match std::mem::take(&mut self.state) {
BinaryClientState::Message { event, data } => {
self.state = BinaryClientState::PartialEventLength { buf_len: 0, buf: [0; 4] };
Some(BinaryMessage {
event: event,
data: data,
})
},
st => {
self.state = st;
None
}
}
}
}
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