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collector: make it actually collect state from discovered balancers (#…
…1418) * collector: make it actually collect state from discovered balancers * finish implementing collecting state * fix lints
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| use std::sync::Arc; | ||
|
|
||
| use once_cell::sync::Lazy; | ||
| use ott_balancer_protocol::collector::BalancerState; | ||
| use ott_common::discovery::{MonolithConnectionConfig, MonolithDiscoveryMsg}; | ||
| use tokio::sync::Mutex; | ||
| use tracing::{error, warn}; | ||
|
|
||
| use crate::SystemState; | ||
|
|
||
| pub static CURRENT_STATE: Lazy<Arc<Mutex<SystemState>>> = | ||
| Lazy::new(|| Arc::new(Mutex::new(SystemState(vec![])))); | ||
|
|
||
| pub struct Collector { | ||
| discovery_rx: tokio::sync::mpsc::Receiver<MonolithDiscoveryMsg>, | ||
| interval: tokio::time::Duration, | ||
| balancers: Vec<MonolithConnectionConfig>, | ||
| } | ||
|
|
||
| impl Collector { | ||
| pub fn new( | ||
| discovery_rx: tokio::sync::mpsc::Receiver<MonolithDiscoveryMsg>, | ||
| interval: tokio::time::Duration, | ||
| ) -> Self { | ||
| Self { | ||
| discovery_rx, | ||
| interval, | ||
| balancers: Default::default(), | ||
| } | ||
| } | ||
|
|
||
| #[must_use] | ||
| pub fn spawn(mut self) -> tokio::task::JoinHandle<()> { | ||
| tokio::spawn(async move { | ||
| self.run().await; | ||
| warn!("Collector task ended"); | ||
| }) | ||
| } | ||
|
|
||
| pub async fn run(&mut self) { | ||
| loop { | ||
| tokio::select! { | ||
| _ = tokio::time::sleep(self.interval) => { | ||
| let new_state = match self.collect().await { | ||
| Ok(new_state) => new_state, | ||
| Err(err) => { | ||
| error!("Unexpected error collecting system state: {}", err); | ||
| continue; | ||
| } | ||
| }; | ||
| let mut current = CURRENT_STATE.lock().await; | ||
| *current = new_state; | ||
| } | ||
| Some(msg) = self.discovery_rx.recv() => { | ||
| self.handle_discovery(msg); | ||
| } | ||
| else => { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn handle_discovery(&mut self, msg: MonolithDiscoveryMsg) { | ||
| self.balancers.retain(|conf| !msg.removed.contains(conf)); | ||
| self.balancers.extend(msg.added); | ||
| } | ||
|
|
||
| pub async fn collect(&self) -> anyhow::Result<SystemState> { | ||
| let client = reqwest::Client::new(); | ||
| let mut states = vec![]; | ||
| for conf in &self.balancers { | ||
| let mut url = conf.uri(); | ||
| url.set_path("/api/state"); | ||
| url.set_scheme("http").expect("scheme should be valid"); | ||
|
|
||
| let resp = client.get(url).send().await?; | ||
| if !resp.status().is_success() { | ||
| error!("Failed to fetch state from {:?}", &conf); | ||
| continue; | ||
| } | ||
| let state = resp.json::<BalancerState>().await?; | ||
| states.push(state); | ||
| } | ||
| info!("Collected state from {} balancers", states.len()); | ||
|
|
||
| Ok(SystemState(states)) | ||
| } | ||
| } |
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