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use std::net::SocketAddr;
use std::time::Duration;
use fibers::Spawn;
use fibers::net::{TcpListener, TcpStream};
use fibers::net::futures::{Connect, TcpListenerBind};
use fibers::net::streams::Incoming;
use fibers::time::timer::{TimeoutAfter, TimerExt};
use futures::{Async, Future, Poll, Stream};
use slog::{Discard, Logger};
use trackable::error::Failed;
use {AsyncResult, ConsulSettings, Error};
use consul::{ConsulClient, ServiceNode};
use proxy_channel::ProxyChannel;
#[derive(Debug, Clone)]
pub struct ProxyServerBuilder {
logger: Logger,
bind_addr: SocketAddr,
consul: ConsulSettings,
service_port: Option<u16>,
connect_timeout: Duration,
}
impl ProxyServerBuilder {
pub const DEFAULT_BIND_ADDR: &'static str = "0.0.0.0:17382";
pub const DEFAULT_CONNECT_TIMEOUT_MS: u64 = 1000;
pub fn new(service: &str) -> Self {
ProxyServerBuilder {
logger: Logger::root(Discard, o!()),
bind_addr: Self::DEFAULT_BIND_ADDR.parse().expect("Never fails"),
consul: ConsulSettings::new(service),
service_port: None,
connect_timeout: Duration::from_millis(Self::DEFAULT_CONNECT_TIMEOUT_MS),
}
}
pub fn logger(&mut self, logger: Logger) -> &mut Self {
self.logger = logger;
self
}
pub fn bind_addr(&mut self, addr: SocketAddr) -> &mut Self {
self.bind_addr = addr;
self
}
pub fn service_port(&mut self, port: u16) -> &mut Self {
self.service_port = Some(port);
self
}
pub fn connect_timeout(&mut self, timeout: Duration) -> &mut Self {
self.connect_timeout = timeout;
self
}
pub fn consul(&mut self) -> &mut ConsulSettings {
&mut self.consul
}
pub fn finish<S: Spawn>(&self, spawner: S) -> ProxyServer<S> {
let consul = self.consul.client();
debug!(self.logger, "Consul query url: {}", consul.query_url());
ProxyServer {
logger: self.logger.clone(),
spawner,
consul,
bind: Some(TcpListener::bind(self.bind_addr)),
incoming: None,
service_port: self.service_port,
connect_timeout: self.connect_timeout,
}
}
}
pub struct ProxyServer<S> {
logger: Logger,
spawner: S,
consul: ConsulClient,
bind: Option<TcpListenerBind>,
incoming: Option<Incoming>,
service_port: Option<u16>,
connect_timeout: Duration,
}
impl<S: Spawn> ProxyServer<S> {
pub fn new(spawner: S, service: &str) -> Self {
ProxyServerBuilder::new(service).finish(spawner)
}
}
impl<S: Spawn> Future for ProxyServer<S> {
type Item = ();
type Error = Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
if let Async::Ready(Some(listener)) = track!(self.bind.poll().map_err(Error::from))? {
info!(self.logger, "Proxy server started");
self.incoming = Some(listener.incoming());
self.bind = None;
}
if let Some(ref mut incoming) = self.incoming {
if let Async::Ready(Some((client, addr))) =
track!(incoming.poll().map_err(Error::from))?
{
let logger = self.logger.new(o!("client" => addr.to_string()));
let error_logger = logger.clone();
let server = SelectServer::new(
logger.clone(),
&self.consul,
self.service_port,
self.connect_timeout,
);
self.spawner.spawn(
track_err!(client)
.and_then(move |client| {
track_err!(server).and_then(move |(server, addr)| {
let logger = logger.new(o!("server" => addr.to_string()));
track_err!(ProxyChannel::new(logger, client, server))
})
})
.map_err(move |e| {
error!(error_logger, "Proxy channel terminated abnormally: {}", e);
}),
);
}
}
Ok(Async::NotReady)
}
}
struct SelectServer {
logger: Logger,
collect_candidates: Option<AsyncResult<Vec<ServiceNode>>>,
connect: Option<TimeoutAfter<Connect>>,
candidates: Vec<ServiceNode>,
server: Option<ServiceNode>,
service_port: Option<u16>,
connect_timeout: Duration,
}
impl SelectServer {
fn new(
logger: Logger,
consul: &ConsulClient,
service_port: Option<u16>,
connect_timeout: Duration,
) -> Self {
SelectServer {
logger,
collect_candidates: Some(consul.find_candidates()),
connect: None,
candidates: Vec::new(),
server: None,
service_port,
connect_timeout,
}
}
}
impl Future for SelectServer {
type Item = (TcpStream, SocketAddr);
type Error = Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
if let Async::Ready(Some(candidates)) = track!(self.collect_candidates.poll())? {
debug!(self.logger, "Candidates: {:?}", candidates);
self.candidates = candidates;
self.candidates.reverse();
self.collect_candidates = None;
}
if self.collect_candidates.is_none() && self.connect.is_none() {
let candidate = track_assert_some!(
self.candidates.pop(),
Failed,
"No available service servers"
);
let addr = candidate.socket_addr(self.service_port);
debug!(self.logger, "Next candidate server is {}", addr);
self.connect = Some(TcpStream::connect(addr).timeout_after(self.connect_timeout));
self.server = Some(candidate);
}
match self.connect.poll() {
Err(e) => {
let server = self.server.take().expect("Never fails");
warn!(
self.logger,
"Cannot connect to the server {}; {}",
server.socket_addr(self.service_port),
e.map(|e| e.to_string())
.unwrap_or_else(|| "Connection timeout".to_owned())
);
self.connect = None;
self.poll()
}
Ok(Async::Ready(Some(stream))) => {
let server = self.server.as_ref().take().expect("Never fails");
let addr = server.socket_addr(self.service_port);
info!(self.logger, "Connected to the server {}", addr);
Ok(Async::Ready((stream, addr)))
}
_ => Ok(Async::NotReady),
}
}
}