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#[macro_use] extern crate log;
extern crate futures;
extern crate tokio_io;
extern crate tokio_uds;
extern crate bytes;
extern crate serde;
extern crate serde_json;
extern crate sozu_command_lib as sozu_command;
use bytes::BytesMut;
use std::io::{self, Error, ErrorKind};
use std::sync::{Arc,Mutex};
use std::collections::hash_map::HashMap;
use futures::{Async, Sink, Stream, Future, future};
use tokio_uds::UnixStream;
use tokio_io::AsyncRead;
use tokio_io::codec::{Decoder, Encoder, Framed};
use std::str::from_utf8;
use sozu_command::data::{ConfigMessage,ConfigMessageAnswer,ConfigMessageStatus};
pub struct CommandCodec;
impl Decoder for CommandCodec {
type Item = ConfigMessageAnswer;
type Error = io::Error;
fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<ConfigMessageAnswer>, io::Error> {
if let Some(pos) = (&buf[..]).iter().position(|&x| x == 0) {
let res = if let Ok(s) = from_utf8(&buf[..pos]) {
match serde_json::from_str(s) {
Ok(message) => Ok(Some(message)),
Err(e) => {
Err(io::Error::new(io::ErrorKind::Other, format!("parse error: {:?}", e)))
}
}
} else {
Err(io::Error::new(io::ErrorKind::InvalidData, String::from("could not parse UTF-8 data")))
};
if pos < buf.len() {
buf.split_to(pos+1);
}
res
} else {
Ok(None)
}
}
}
impl Encoder for CommandCodec {
type Item = ConfigMessage;
type Error = io::Error;
fn encode(&mut self, message: ConfigMessage, buf: &mut BytesMut) -> Result<(), Self::Error> {
match serde_json::to_string(&message) {
Ok(data) => {
trace!("encoded message: {}", data);
buf.extend(data.as_bytes());
buf.extend(&[0u8][..]);
trace!("buffer content: {:?}", from_utf8(&buf[..]));
Ok(()) },
Err(e) => Err(io::Error::new(io::ErrorKind::Other, format!("serialization error: {:?}", e)))
}
}
}
pub struct SozuCommandTransport {
upstream: Framed<UnixStream,CommandCodec>,
received: HashMap<String,ConfigMessageAnswer>,
}
impl SozuCommandTransport {
pub fn new(stream: UnixStream) -> SozuCommandTransport {
SozuCommandTransport {
upstream: stream.framed(CommandCodec),
received: HashMap::new(),
}
}
}
#[derive(Clone)]
pub struct SozuCommandClient {
transport: Arc<Mutex<SozuCommandTransport>>,
}
impl SozuCommandClient {
pub fn new(stream: UnixStream) -> SozuCommandClient {
SozuCommandClient {
transport: Arc::new(Mutex::new(SozuCommandTransport::new(stream))),
}
}
pub fn send(&mut self, message: ConfigMessage) -> Box<Future<Item = ConfigMessageAnswer, Error = io::Error>> {
trace!("will send message: {:?}", message);
let tr = self.transport.clone();
let tr2 = self.transport.clone();
if let Ok(mut transport) = self.transport.lock() {
let id = message.id.clone();
let res = transport.upstream.start_send(message);
trace!("start_send result: {:?}", res);
Box::new(future::poll_fn(move || {
if let Ok(mut transport) = tr2.try_lock() {
let res = transport.upstream.poll_complete();
res
} else {
Err(Error::new(ErrorKind::ConnectionAborted, format!("could not send message")))
}
}).and_then(|_| {
future::poll_fn(move || {
trace!("polling for id = {}", id);
if let Ok(mut transport) = tr.try_lock() {
if let Some(message) = transport.received.remove(&id) {
if message.status == ConfigMessageStatus::Processing {
info!("processing: {:?}", message);
} else {
return Ok(Async::Ready(message))
}
}
let value = match transport.upstream.poll() {
Ok(Async::Ready(t)) => t,
Ok(Async::NotReady) => {
trace!("upstream poll gave NotReady");
return Ok(Async::NotReady);
},
Err(e) => {
trace!("upstream poll gave error: {:?}", e);
return Err(From::from(e));
},
};
if let Some(message) = value {
trace!("upstream poll gave message: {:?}", message);
if message.id != id {
transport.received.insert(message.id.clone(), message);
Ok(Async::NotReady)
} else {
if message.status == ConfigMessageStatus::Processing {
info!("processing: {:?}", message);
Ok(Async::NotReady)
} else {
Ok(Async::Ready(message))
}
}
} else {
trace!("upstream poll gave Ready(None)");
Ok(Async::NotReady)
}
} else {
Err(
Error::new(ErrorKind::ConnectionAborted, format!("could not send message"))
)
}
})
}))
} else {
Box::new(future::err(
Error::new(ErrorKind::ConnectionAborted, format!("could not send message"))
))
}
}
}