86 lines
2.6 KiB
Rust
86 lines
2.6 KiB
Rust
use std::time::Duration;
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use tokio::time::timeout;
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mod config;
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mod scheduler;
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mod feed;
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mod worker;
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mod trends;
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use worker::Message;
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#[tokio::main]
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async fn main() {
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let config = config::Config::load_file(
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&std::env::args()
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.skip(1)
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.next()
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.expect("Call with config.yaml")
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);
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let mut scheduler = scheduler::Scheduler::new();
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for host in config.hosts.into_iter() {
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scheduler.introduce(host);
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}
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let client = reqwest::Client::builder()
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.timeout(Duration::from_secs(30))
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.user_agent(concat!(
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env!("CARGO_PKG_NAME"),
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"/",
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env!("CARGO_PKG_VERSION"),
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))
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.deflate(true)
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.gzip(true)
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.build()
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.expect("reqwest::Client");
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let (posts_tx, posts_rx) = tokio::sync::mpsc::unbounded_channel();
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println!("spawning");
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trends::spawn(&config.redis, posts_rx).await;
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println!("spawned");
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let mut workers_active = 0usize;
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let (message_tx, mut message_rx) = tokio::sync::mpsc::unbounded_channel();
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loop {
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println!("{} workers active, queued {} of {}", workers_active, scheduler.queue_len(), scheduler.size());
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let next_task = if workers_active < config.max_workers {
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scheduler.dequeue()
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} else {
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Err(Duration::from_secs(5))
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};
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match next_task {
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Err(duration) => {
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let _ = timeout(duration, async {
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let message = message_rx.recv().await.unwrap();
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match message {
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Message::Fetched { host, next_interval, latest_timestamp } => {
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workers_active -= 1;
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scheduler.enqueue(host, next_interval, latest_timestamp);
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}
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Message::Error { host } => {
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workers_active -= 1;
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scheduler.enqueue(host, Duration::from_secs(config.interval_after_error), None);
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}
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Message::IntroduceHosts { hosts } => {
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for host in hosts.into_iter() {
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scheduler.introduce(host);
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}
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}
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}
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}).await;
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}
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Ok(host) => {
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println!("Fetch {}", host);
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workers_active += 1;
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worker::fetch_and_process(
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message_tx.clone(),
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posts_tx.clone(),
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client.clone(),
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host
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);
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}
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}
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}
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}
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