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|
use crate::{State, Worker};
use anyhow::{Result, bail};
use axum::{
extract::{
State as S, WebSocketUpgrade,
ws::{Message, WebSocket},
},
response::IntoResponse,
};
use futures::{SinkExt, StreamExt};
use log::warn;
use serde::{Deserialize, Serialize};
use serde_json::{Map, Value};
use std::sync::Arc;
use tokio::{
spawn,
sync::{RwLock, mpsc::channel},
};
pub type WorkerID = u64;
#[derive(Debug, Deserialize)]
#[serde(tag = "t", rename_all = "snake_case")]
pub enum WorkerRequest {
Register {
name: String,
sources: Vec<String>,
},
Metadata {
key: String,
data: Map<String, Value>,
},
Enqueue {
key: String,
},
Complete {
key: String,
},
Accept,
Save,
_EchoError {
message: String,
},
}
#[derive(Debug, Serialize)]
#[serde(tag = "t", rename_all = "snake_case")]
pub enum WorkerResponse {
Ok,
Work {
key: String,
data: Map<String, Value>,
},
Error {
message: String,
},
}
pub(crate) async fn worker_websocket(
ws: WebSocketUpgrade,
S(state): S<Arc<RwLock<State>>>,
) -> impl IntoResponse {
ws.on_upgrade(|ws| worker_websocket_inner(ws, state))
}
async fn worker_websocket_inner(ws: WebSocket, state: Arc<RwLock<State>>) {
let (mut send, mut recv) = ws.split();
let (tx, mut rx) = channel(16);
let worker = {
let mut g = state.write().await;
let id = g.worker_id_counter;
g.worker_id_counter += 1;
g.workers.insert(
id,
Worker {
send: tx,
accept: 0,
name: "unknown".to_string(),
sources: vec![],
},
);
id
};
let mut send_task = spawn(async move {
while let Some(m) = rx.recv().await {
if let Err(e) = send
.send(Message::Text(serde_json::to_string(&m).unwrap().into()))
.await
{
warn!("error sending response: {e:?}");
break;
}
}
});
let state2 = state.clone();
let mut recv_task = spawn(async move {
while let Some(message) = recv.next().await {
if let Ok(m) = message {
match m {
Message::Text(t) => {
let req = match serde_json::from_str::<WorkerRequest>(t.as_str()) {
Ok(v) => v,
Err(e) => {
warn!("error parsing request: {e:?}");
WorkerRequest::_EchoError {
message: format!("{e:#}"),
}
}
};
if let Err(e) = state.write().await.handle_worker_message(worker, req).await
{
warn!("error processing request: {e:?}");
state.write().await.send_to_worker(
worker,
WorkerResponse::Error {
message: format!("{e:?}"),
},
);
}
}
_ => (),
}
}
}
});
tokio::select! {
_ = &mut send_task => recv_task.abort(),
_ = &mut recv_task => send_task.abort(),
};
{
let mut g = state2.write().await;
g.workers.remove(&worker).unwrap();
}
}
impl State {
pub fn send_to_worker(&mut self, w: WorkerID, resp: WorkerResponse) {
if let Err(_) = self.workers[&w].send.try_send(resp) {
warn!("worker ws response overflow");
}
}
pub async fn handle_worker_message(&mut self, w: WorkerID, req: WorkerRequest) -> Result<()> {
let worker = self.workers.get_mut(&w).unwrap();
match req {
WorkerRequest::Register { name, sources } => {
worker.name = name;
worker.sources = sources;
}
WorkerRequest::Metadata { key, data } => {
let m = self.metadata.entry(key).or_default();
m.extend(data);
}
WorkerRequest::Enqueue { key } => {
self.queue.insert(key);
}
WorkerRequest::Complete { key } => {
if self.loading.remove(&key) {
self.complete.insert(key);
} else {
bail!("was not loading")
}
}
WorkerRequest::Accept => {
worker.accept += 1;
}
WorkerRequest::Save => {
self.save().await?;
}
WorkerRequest::_EchoError { message } => {
self.send_to_worker(w, WorkerResponse::Error { message });
}
}
Ok(())
}
}
|
