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use futures::task;
use futures::{Async, AsyncSink, Future, Stream};
use tokio::timer::Interval;
use std::cell::Cell;
use std::rc::{Rc, Weak};
use std::time::{Duration, Instant};
use crate::proxy::standalone::{Cluster, Request};
#[derive(Debug)]
enum State<T> {
Justice(bool),
OnFail,
OnSuccess,
Sending(T),
Waitting(T),
}
pub struct Ping<T: Request> {
cluster: Weak<Cluster<T>>,
name: String,
addr: String,
fail_interval: Interval,
succ_interval: Interval,
count: u8,
limit: u8,
state: State<T>,
cancel: Rc<Cell<bool>>,
}
impl<T: Request> Ping<T> {
pub fn new(
cluster: Weak<Cluster<T>>,
name: String,
addr: String,
cancel: Rc<Cell<bool>>,
interval_millis: u64,
succ_interval_millis: u64,
limit: u8,
) -> Ping<T> {
let fail_interval = Interval::new(
Instant::now() + Duration::from_secs(1),
Duration::from_millis(interval_millis),
);
let succ_interval = Interval::new(
Instant::now() + Duration::from_secs(1),
Duration::from_millis(succ_interval_millis),
);
Ping {
cluster,
name,
addr,
fail_interval,
succ_interval,
limit,
count: 0,
state: State::OnSuccess,
cancel,
}
}
}
impl<T: Request + 'static> Future for Ping<T> {
type Item = ();
type Error = ();
fn poll(&mut self) -> Result<Async<Self::Item>, Self::Error> {
loop {
if self.cancel.get() {
info!("ping to {}({}) was canceld by handle", self.name, self.addr);
return Ok(Async::Ready(()));
}
match self.state {
State::Justice(is_last_succ) => {
if is_last_succ {
if self.count > self.limit {
if let Some(cluster) = self.cluster.upgrade() {
cluster.add_node(self.name.clone()).map_err(|err| {
error!(
"fail to add node for {} due to {:?}",
self.name.clone(),
err
);
})?;
} else {
return Ok(Async::Ready(()));
}
}
self.count = 0;
self.state = State::OnSuccess;
} else {
self.count = self.count.wrapping_add(1);
debug!("ping state fail count={} limit={}", self.count, self.limit);
#[allow(clippy::comparison_chain)]
if self.count == self.limit {
if let Some(cluster) = self.cluster.upgrade() {
info!("remove node={} addr={} by ping error", self.name, self.addr);
cluster.remove_node(self.name.clone());
} else {
return Ok(Async::Ready(()));
}
self.state = State::OnFail;
} else if self.count > self.limit {
self.state = State::OnFail;
} else {
self.state = State::OnSuccess;
}
if let Some(cluster) = self.cluster.upgrade() {
cluster.reconnect(&self.addr);
} else {
return Ok(Async::Ready(()));
}
}
}
State::OnSuccess => match self.succ_interval.poll() {
Ok(Async::Ready(Some(_))) => {
let mut cmd = T::ping_request();
cmd.reregister(task::current());
self.state = State::Sending(cmd);
}
Ok(Async::Ready(None)) => {
return Ok(Async::Ready(()));
}
Ok(Async::NotReady) => {
return Ok(Async::NotReady);
}
Err(err) => {
warn!("fail to poll interval due when succ {:?}", err);
}
},
State::OnFail => match self.fail_interval.poll() {
Ok(Async::Ready(Some(_))) => {
let mut cmd = T::ping_request();
cmd.reregister(task::current());
self.state = State::Sending(cmd);
}
Ok(Async::Ready(None)) => {
return Ok(Async::Ready(()));
}
Ok(Async::NotReady) => {
return Ok(Async::NotReady);
}
Err(err) => {
warn!("fail to poll interval due when fail {:?}", err);
}
},
State::Sending(ref cmd) => {
let rc_cmd = cmd.clone();
if !rc_cmd.can_cycle() {
self.state = State::Justice(false);
continue;
}
if let Some(cluster) = self.cluster.upgrade() {
match cluster.dispatch_to(&self.addr, rc_cmd) {
Ok(AsyncSink::NotReady(_)) => {
return Ok(Async::NotReady);
}
Ok(AsyncSink::Ready) => {
self.state = State::Waitting(cmd.clone());
}
Err(err) => {
info!("fail to dispatch_to {} due to {:?}", self.addr, err);
self.state = State::Justice(false);
}
}
} else {
info!("cluster has drooped and exit ping");
return Ok(Async::Ready(()));
}
}
State::Waitting(ref cmd) => {
if !cmd.is_done() {
return Ok(Async::NotReady);
}
self.state = State::Justice(!cmd.is_error());
}
}
}
}
}
