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use std::net::IpAddr;
use std::io::{Write, ErrorKind};
use std::io::Read;
use mio::*;
use mio::tcp::TcpStream;
use mio::unix::UnixReady;
use nom::IResult::*;
use nom::Offset;
use network::protocol::proxy_protocol::header;
use network::{Protocol, ClientResult};
use network::Readiness;
use network::protocol::ProtocolResult;
use network::socket::{SocketHandler, SocketResult};
use network::buffer_queue::BufferQueue;
use network::SessionMetrics;
use network::protocol::pipe::Pipe;
use parser::proxy_protocol::parse_v2_header;
use pool::Checkout;
pub struct RelayProxyProtocol<Front:SocketHandler> {
pub header_size: Option<usize>,
pub frontend: Front,
pub backend: Option<TcpStream>,
pub frontend_token: Token,
pub backend_token: Option<Token>,
pub front_buf: Checkout<BufferQueue>,
pub readiness: Readiness,
cursor_header: usize,
}
impl <Front:SocketHandler + Read>RelayProxyProtocol<Front> {
pub fn new(frontend: Front, frontend_token: Token,backend: Option<TcpStream>, front_buf: Checkout<BufferQueue>) -> Self {
RelayProxyProtocol {
header_size: None,
frontend,
backend,
frontend_token,
backend_token: None,
front_buf,
readiness: Readiness {
front_interest: UnixReady::from(Ready::readable()) | UnixReady::hup() | UnixReady::error(),
back_interest: UnixReady::hup() | UnixReady::error(),
front_readiness: UnixReady::from(Ready::empty()),
back_readiness: UnixReady::from(Ready::empty()),
},
cursor_header: 0,
}
}
pub fn readable(&mut self, metrics: &mut SessionMetrics) -> ClientResult {
let (sz, res) = self.frontend.socket_read(self.front_buf.buffer.space());
debug!("FRONT proxy protocol [{:?}]: read {} bytes and res={:?}", self.frontend_token, sz, res);
if sz > 0 {
self.front_buf.buffer.fill(sz);
self.front_buf.sliced_input(sz);
count!("bytes_in", sz as i64);
metrics.bin += sz;
if res == SocketResult::Error {
error!("[{:?}] front socket error, closing the connection", self.frontend_token);
metrics.service_stop();
incr!("proxy_protocol.errors");
self.readiness.reset();
return ClientResult::CloseClient;
}
if res == SocketResult::WouldBlock {
self.readiness.front_readiness.remove(Ready::readable());
}
let read_sz = match parse_v2_header(self.front_buf.unparsed_data()) {
Done(rest, header) => {
self.readiness.front_interest.remove(Ready::readable());
self.readiness.back_interest.insert(Ready::writable());
self.front_buf.next_output_data().offset(rest)
},
Incomplete(_) => {
return ClientResult::Continue
},
Error(e) => {
return ClientResult::CloseClient
}
};
self.header_size = Some(read_sz);
self.front_buf.consume_parsed_data(sz);
self.front_buf.slice_output(sz);
return ClientResult::Continue
}
return ClientResult::Continue;
}
pub fn back_writable(&mut self, metrics: &mut SessionMetrics) -> (ProtocolResult, ClientResult) {
debug!("Writing proxy protocol header");
if let Some(ref mut socket) = self.backend {
if let Some(ref header_size) = self.header_size {
loop {
match socket.write(self.front_buf.next_output_data()) {
Ok(sz) => {
self.cursor_header += sz;
metrics.backend_bout += sz;
self.front_buf.consume_output_data(sz);
if self.cursor_header >= *header_size {
info!("Proxy protocol sent, upgrading");
return (ProtocolResult::Upgrade, ClientResult::Continue)
}
},
Err(e) => {
metrics.service_stop();
incr!("proxy_protocol.errors");
self.readiness.reset();
debug!("PROXY PROTOCOL {}", e);
break;
},
}
}
}
}
(ProtocolResult::Continue, ClientResult::Continue)
}
pub fn front_socket(&self) -> &TcpStream {
self.frontend.socket_ref()
}
pub fn back_socket(&self) -> Option<&TcpStream> {
self.backend.as_ref()
}
pub fn set_back_socket(&mut self, socket: TcpStream) {
self.backend = Some(socket);
}
pub fn back_token(&self) -> Option<Token> {
self.backend_token
}
pub fn set_back_token(&mut self, token: Token) {
self.backend_token = Some(token);
}
pub fn readiness(&mut self) -> &mut Readiness {
&mut self.readiness
}
pub fn into_pipe(mut self, back_buf: Checkout<BufferQueue>) -> Pipe<Front> {
let backend_socket = self.backend.take().unwrap();
let addr = backend_socket.peer_addr().map(|s| s.ip()).ok();
let mut pipe = Pipe::new(
self.frontend.take(0).into_inner(),
self.frontend_token,
Some(backend_socket),
self.front_buf,
back_buf,
addr,
);
pipe.readiness.front_readiness = self.readiness.front_readiness;
pipe.readiness.back_readiness = self.readiness.back_readiness;
if let Some(back_token) = self.backend_token {
pipe.set_back_token(back_token);
}
pipe
}
}