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use futures::task;
use futures::unsync::mpsc::{channel, Sender};
use futures::{Async, AsyncSink, Future, Sink};
use crate::com::AsError;
use crate::com::ClusterConfig;
use crate::protocol::redis::{new_cluster_slots_cmd, new_auth_cmd, slots_reply_to_replicas, Cmd};
use crate::proxy::cluster::{Cluster, ConnBuilder};
enum State {
Pending,
Connecting,
Authing(Sender<Cmd>, Cmd),
WaitAuthing(Sender<Cmd>, Cmd),
Fetching(Sender<Cmd>, Cmd),
Waitting(Sender<Cmd>, Cmd),
Done(Cmd),
}
pub struct Initializer {
cc: ClusterConfig,
current: usize,
state: State,
}
impl Initializer {
pub fn new(cc: ClusterConfig) -> Initializer {
Initializer {
cc,
current: 0,
state: State::Pending,
}
}
}
impl Future for Initializer {
type Item = ();
type Error = AsError;
fn poll(&mut self) -> Result<Async<Self::Item>, Self::Error> {
loop {
match &mut self.state {
State::Pending => {
self.current = 0;
self.state = State::Connecting;
}
State::Connecting => {
if self.current >= self.cc.servers.len() {
return Err(AsError::ClusterAllSeedsDie(self.cc.name.clone()));
}
let addr = self.cc.servers[self.current].clone();
let (tx, _rx) = channel(0); let conn = ConnBuilder::new()
.moved(tx)
.cluster(self.cc.name.clone())
.node(addr.to_string())
.read_timeout(self.cc.read_timeout.clone())
.write_timeout(self.cc.write_timeout.clone())
.auth(self.cc.auth.clone())
.connect();
self.current += 1;
match conn {
Ok(sender) => {
let auth = self.cc.auth.clone();
if auth != "" {
let mut cmd = new_auth_cmd(&auth);
cmd.reregister(task::current());
self.state = State::Authing(sender, cmd);
} else {
let mut cmd = new_cluster_slots_cmd();
cmd.reregister(task::current());
self.state = State::Fetching(sender, cmd);
}
}
Err(err) => {
warn!("fail to connect to backend {} due to {}", &addr, &err);
self.state = State::Connecting;
}
}
}
State::Authing(ref mut sender, ref cmd) => match sender.start_send(cmd.clone()) {
Ok(AsyncSink::NotReady(_cmd)) => {
return Ok(Async::NotReady);
}
Ok(AsyncSink::Ready) => {
self.state = State::WaitAuthing(sender.clone(), cmd.clone());
}
Err(err) => {
let addr = self.cc.servers[self.current - 1].clone();
error!("fail to send AUTH cmd to {} due {}", addr, err);
if let Err(_err) = sender.close() {
warn!("init fetching connection can't be closed properly, skip");
}
self.state = State::Connecting;
}
},
State::WaitAuthing(ref mut sender, ref mut cmd) => {
if !cmd.borrow().is_done() {
return Ok(Async::NotReady);
}
debug!("AUTH get response as {:?}", cmd);
let mut cmd = new_cluster_slots_cmd();
cmd.reregister(task::current());
self.state = State::Fetching(sender.clone(), cmd);
}
State::Fetching(ref mut sender, ref cmd) => match sender.start_send(cmd.clone()) {
Ok(AsyncSink::NotReady(_cmd)) => {
return Ok(Async::NotReady);
}
Ok(AsyncSink::Ready) => {
self.state = State::Waitting(sender.clone(), cmd.clone());
}
Err(err) => {
let addr = self.cc.servers[self.current - 1].clone();
error!("fail to send CLUSTER SLOTS cmd to {} due {}", addr, err);
if let Err(_err) = sender.close() {
warn!("init fetching connection can't be closed properly, skip");
}
self.state = State::Connecting;
}
},
State::Waitting(ref mut sender, ref mut cmd) => {
if !cmd.borrow().is_done() {
return Ok(Async::NotReady);
}
if let Err(_err) = sender.close() {
warn!("init waitting connection can't be closed properly, skip");
}
debug!("CLUSTER SLOTS get response as {:?}", cmd);
self.state = State::Done(cmd.clone());
}
State::Done(cmd) => match slots_reply_to_replicas(cmd.clone()) {
Ok(Some(replica)) => {
let cluster = Cluster::run(self.cc.clone(), replica);
match cluster {
Ok(_) => {
info!("succeed to create cluster {}", self.cc.name);
return Ok(Async::Ready(()));
}
Err(err) => {
warn!("fail to init cluster {} due to {}", self.cc.name, err);
self.state = State::Connecting;
}
}
}
Ok(None) => {
warn!("slots not full covered, this may be not allow in aster");
self.state = State::Connecting;
}
Err(err) => {
warn!("fail to parse cmd reply due {}", err);
self.state = State::Connecting;
}
},
}
}
}
}