93 lines
2.3 KiB
Rust
93 lines
2.3 KiB
Rust
use scraper::{Html,Selector};
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use url::Url;
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use tokio::sync::mpsc::{self, Sender}; //, Receiver};
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const WORKERS : usize = 8;
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type SiteStat = (Url, Vec<Url>);
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#[tokio::main]
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async fn main() -> Result<(), Box<dyn std::error::Error>> {
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let addr = std::env::args().nth(1)
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.unwrap_or_else(|| "https://www.tmplab.org".to_string());
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let links = get_links(addr.as_ref()).await?;
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let addr = Url::parse(addr.as_ref())?;
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let mut links : Vec<Url> = links.into_iter()
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.filter(| url | url.host() != addr.host())
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.collect();
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let (tx, mut rx) = mpsc::channel(32);
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// spawn a pool of workers
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let mut workers : Vec<Option<Sender<Url>>> = (0..WORKERS)
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.map(| n | Some(spawn_worker(n, tx.clone())))
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.collect();
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// send 1 url to each worker to get things started
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for tx in &workers {
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if let Some(url) = links.pop() {
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tx.as_ref().unwrap().send(url).await.unwrap();
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}
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}
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let mut results = vec![];
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// recieve the results and send back new url to the workers
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while let Some((idx, res)) = rx.recv().await {
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if let Some(res) = res {
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results.push(res);
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}
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if let Some(addr) = links.pop() {
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workers[idx].as_ref().unwrap().send(addr).await.unwrap();
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} else {
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workers[idx].take().unwrap();
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if workers.iter().filter(| tx | tx.is_some()).count() == 0 {
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break;
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}
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}
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}
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for (url, links) in &results {
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println!("{url} : {} links", links.len())
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}
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println!("TOTAL: {}", results.len());
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Ok(())
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}
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fn spawn_worker(
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id: usize,
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tx: Sender<(usize,Option<SiteStat>)>
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) -> Sender<Url> {
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let (tx1, mut rx) = mpsc::channel::<Url>(16);
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tokio::spawn(async move {
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println!("Start worker {id}");
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while let Some(url) = rx.recv().await {
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println!("Start fetching {url}");
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let res = get_links(url.as_ref()).await
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.map(| v | (url.clone(), v)).ok();
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println!("Got {url}");
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tx.send((id, res)).await.unwrap()
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}
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println!("Terminate worker {id}");
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});
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tx1
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}
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async fn get_links(
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url: &str
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) -> Result<Vec<Url>, reqwest::Error> {
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let a_selector = Selector::parse("a[href]").unwrap();
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let body = reqwest::get(url)
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.await?
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.text()
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.await?;
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Ok(Html::parse_document(&body)
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.select(&a_selector)
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.filter_map(| link | link.value().attr("href")
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.and_then(| href | Url::parse(href).ok()))
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.collect())
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}
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