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use crate::{App, NodeContext};
use anyhow::Result;
use async_std::net::{SocketAddr, ToSocketAddrs};
use async_std::task;
use futures::channel::mpsc;
use futures::future::Either;
use futures::prelude::*;
use potatonet_client::Client;
use potatonet_common::{bus_message, LocalServiceId, Request};
use std::sync::Arc;
/// 节点构建器
pub struct NodeBuilder {
bus_addr: Option<SocketAddr>,
app: App,
}
impl NodeBuilder {
/// 创建节点
pub fn new(app: App) -> Self {
Self {
bus_addr: None,
app,
}
}
/// 消息总线地址
pub async fn bus_addr<A: ToSocketAddrs>(mut self, addr: A) -> Result<Self> {
self.bus_addr = addr.to_socket_addrs().await?.next();
Ok(self)
}
/// 运行节点
pub async fn run(self) -> Result<()> {
let app = Arc::new(self.app);
let (tx_abort, rx_abort) = mpsc::channel(1);
let (tx, rx) = mpsc::channel(16);
let bus_addr = self
.bus_addr
.unwrap_or_else(|| "127.0.0.1:39901".parse().unwrap());
let client = match Client::connect_with_notify(bus_addr, move |msg| {
let mut tx = tx.clone();
async move {
tx.send(msg).await.ok();
}
})
.await
{
Ok(client) => Arc::new(client),
Err(err) => {
error!("failed to connect to bus. err={}", err);
return Ok(());
}
};
// 开始所有服务
for (idx, (service_name, service)) in app.services.iter().enumerate() {
info!("start service. name={}", service_name);
let lid = LocalServiceId(idx as u32);
service
.start(&NodeContext {
client: client.clone(),
app: app.clone(),
from: None,
service_name: &service_name,
local_service_id: LocalServiceId(idx as u32),
tx_abort: tx_abort.clone(),
})
.await;
// 注册服务
trace!("register service. name={} lid={}", service_name, lid);
client.register_service(service_name, lid).await;
}
let mut s = stream::select(
rx.map(|msg| Either::Left(msg)),
rx_abort.map(|_| Either::Right(())),
);
while let Some(msg) = s.next().await {
match msg {
// 请求
Either::Left(bus_message::Message::XReq {
from,
to,
seq,
method,
data,
}) => {
trace!(
"MSG:XREQ seq={} from={} to={} method={}",
seq,
from,
to,
method
);
task::spawn({
let app = app.clone();
let client = client.clone();
let tx_abort = tx_abort.clone();
async move {
if let Some((service_name, service)) = app.services.get(to.0 as usize) {
let res = service
.call(
&NodeContext {
client: client.clone(),
app: app.clone(),
from: Some(from),
service_name: &service_name,
local_service_id: to,
tx_abort,
},
Request::new(method, data),
)
.await;
client
.send_msg(bus_message::Message::Rep {
seq,
result: res
.map(|resp| resp.data)
.map_err(|err| err.to_string()),
})
.await;
} else {
client
.send_msg(bus_message::Message::Rep {
seq,
result: Err("service not found".to_string()),
})
.await;
}
}
});
}
// 通知
Either::Left(bus_message::Message::XNotify {
from,
to_service,
method,
data,
}) => {
trace!(
"MSG:XNOTIFY from={} to={} method={}",
from,
to_service,
method
);
task::spawn({
let app = app.clone();
let client = client.clone();
let tx_abort = tx_abort.clone();
async move {
if let Some(lid) = app.services_map.get(&to_service) {
if let Some((service_name, service)) =
app.services.get(lid.0 as usize)
{
service
.notify(
&NodeContext {
from: Some(from),
client,
app: app.clone(),
service_name: &service_name,
local_service_id: *lid,
tx_abort: tx_abort.clone(),
},
Request::new(method, data),
)
.await;
}
}
}
});
}
Either::Right(_) => {
break;
}
_ => {}
}
}
// 停止所有服务
for (idx, (service_name, service)) in app.services.iter().enumerate().rev() {
info!("stop service. name={}", service_name);
let lid = LocalServiceId(idx as u32);
service
.stop(&NodeContext {
client: client.clone(),
app: app.clone(),
from: None,
service_name: &service_name,
local_service_id: LocalServiceId(idx as u32),
tx_abort: tx_abort.clone(),
})
.await;
// 注销服务
trace!("unregister service. name={} lid={}", service_name, lid);
client.unregister_service(lid).await;
}
info!("node shutdown.");
Ok(())
}
}