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use fibers::sync::mpsc;
use fibers::{BoxSpawn, Spawn};
use fibers_rpc::client::ClientServiceHandle;
use futures::{Async, Stream};
use prometrics::metrics::{Counter, MetricBuilder};
use raftlog::message::Message;
use raftlog::{self, ErrorKind, Result};
use super::client::RpcClient;
use crate::NodeId;
#[derive(Debug)]
pub struct Mailer {
spawner: BoxSpawn,
rpc_service: ClientServiceHandle,
message_tx: mpsc::Sender<Message>,
message_rx: mpsc::Receiver<Message>,
metrics: Option<Metrics>,
}
impl Mailer {
pub fn new<S>(spawner: S, rpc_service: ClientServiceHandle, metrics: Option<Metrics>) -> Self
where
S: Spawn + Send + 'static,
{
let (message_tx, message_rx) = mpsc::channel();
Mailer {
spawner: spawner.boxed(),
rpc_service,
message_tx,
message_rx,
metrics,
}
}
pub(crate) fn mailbox(&self) -> Mailbox {
Mailbox {
message_tx: self.message_tx.clone(),
}
}
pub(crate) fn try_recv_message(&mut self) -> Result<Option<Message>> {
if let Async::Ready(message) = self.message_rx.poll().expect("Never fails") {
if let Some(ref metrics) = self.metrics {
if let Some(ref message) = message {
match *message {
raftlog::message::Message::RequestVoteCall { .. } => {
metrics.recv_request_vote_call_messages.increment()
}
raftlog::message::Message::RequestVoteReply { .. } => {
metrics.recv_request_vote_reply_messages.increment()
}
raftlog::message::Message::AppendEntriesCall { .. } => {
metrics.recv_append_entries_call_messages.increment()
}
raftlog::message::Message::AppendEntriesReply { .. } => {
metrics.recv_append_entries_reply_messages.increment()
}
raftlog::message::Message::InstallSnapshotCast { .. } => {
metrics.recv_install_snapshot_cast_messages.increment()
}
}
}
}
if message.is_some() {
Ok(message)
} else {
track_panic!(
ErrorKind::Other,
"Message receiving channel is disconnected"
);
}
} else {
Ok(None)
}
}
pub(crate) fn send_message(&mut self, destination: &NodeId, message: Message) {
if let Some(ref metrics) = self.metrics {
match message {
raftlog::message::Message::RequestVoteCall { .. } => {
metrics.send_request_vote_call_messages.increment()
}
raftlog::message::Message::RequestVoteReply { .. } => {
metrics.send_request_vote_reply_messages.increment()
}
raftlog::message::Message::AppendEntriesCall { .. } => {
metrics.send_append_entries_call_messages.increment()
}
raftlog::message::Message::AppendEntriesReply { .. } => {
metrics.send_append_entries_reply_messages.increment()
}
raftlog::message::Message::InstallSnapshotCast { .. } => {
metrics.send_install_snapshot_cast_messages.increment()
}
}
}
let client = RpcClient::new(destination.addr, &self.rpc_service);
client.send_rpc_message(message);
}
}
#[derive(Debug, Clone)]
pub struct Mailbox {
message_tx: mpsc::Sender<Message>,
}
impl Mailbox {
pub fn deliver(&self, message: Message) -> Result<()> {
if self.message_tx.send(message).is_err() {
track_panic!(ErrorKind::Other, "The receiver side is down");
}
Ok(())
}
}
#[derive(Debug, Clone)]
pub struct Metrics {
send_request_vote_call_messages: Counter,
send_request_vote_reply_messages: Counter,
send_append_entries_call_messages: Counter,
send_append_entries_reply_messages: Counter,
send_install_snapshot_cast_messages: Counter,
recv_request_vote_call_messages: Counter,
recv_request_vote_reply_messages: Counter,
recv_append_entries_call_messages: Counter,
recv_append_entries_reply_messages: Counter,
recv_install_snapshot_cast_messages: Counter,
}
impl Metrics {
pub fn new() -> Self {
let mut builder = MetricBuilder::new();
builder.namespace("frugalos_raft").subsystem("rpc");
Metrics {
send_request_vote_call_messages: builder
.counter("send_messages_total")
.label("type", "request_vote_call")
.finish()
.unwrap(),
send_request_vote_reply_messages: builder
.counter("send_messages_total")
.label("type", "request_vote_reply")
.finish()
.unwrap(),
send_append_entries_call_messages: builder
.counter("send_messages_total")
.label("type", "append_entries_call")
.finish()
.unwrap(),
send_append_entries_reply_messages: builder
.counter("send_messages_total")
.label("type", "append_entries_reply")
.finish()
.unwrap(),
send_install_snapshot_cast_messages: builder
.counter("send_messages_total")
.label("type", "install_snapshot_cast")
.finish()
.unwrap(),
recv_request_vote_call_messages: builder
.counter("recv_messages_total")
.label("type", "request_vote_call")
.finish()
.unwrap(),
recv_request_vote_reply_messages: builder
.counter("recv_messages_total")
.label("type", "request_vote_reply")
.finish()
.unwrap(),
recv_append_entries_call_messages: builder
.counter("recv_messages_total")
.label("type", "append_entries_call")
.finish()
.unwrap(),
recv_append_entries_reply_messages: builder
.counter("recv_messages_total")
.label("type", "append_entries_reply")
.finish()
.unwrap(),
recv_install_snapshot_cast_messages: builder
.counter("recv_messages_total")
.label("type", "install_snapshot_cast")
.finish()
.unwrap(),
}
}
}
impl Default for Metrics {
fn default() -> Self {
Self::new()
}
}