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tokio::{ + runtime::Runtime, + sync::{mpsc, Semaphore}, +}; +use url::Url; + +const MAX_TASK: usize = 16; + +lazy_static! { + static ref URL: Url = Url::parse("https://quotes.toscrape.com/").unwrap(); + static ref CLIENT: Client = { + use reqwest::header::{HeaderMap, HeaderValue, USER_AGENT}; + let mut headers = HeaderMap::new(); + let user_agent = HeaderValue::from_static( + r"Mozilla/5.0 (X11; Linux x86_64; rv:84.0) Gecko/20100101 Firefox/84.0", + ); + headers.insert(USER_AGENT, user_agent); + Client::builder().default_headers(headers).build().unwrap() + }; +} + +#[derive(Debug)] +struct Quote { + text: String, + author: String, + tags: Vec, +} + +async fn download_quote_html(idx: usize) -> reqwest::Result { + let page_url = URL.join(&format!("page/{}/", idx)).unwrap(); + let res = CLIENT.get(page_url).send().await?; + let html = res.text().await?; + Ok(html) +} + +fn parse_quote_html(page: Html) -> Vec { + lazy_static! { + static ref QUOTE: Selector = Selector::parse(r#".quote"#).unwrap(); + static ref TEXT: Selector = Selector::parse(r#".text"#).unwrap(); + static ref AUTHOR: Selector = Selector::parse(r#".author"#).unwrap(); + static ref TAG: Selector = Selector::parse(r#".tag"#).unwrap(); + } + page.select("E) + .map(|quote| Quote { + text: quote.select(&TEXT).next().unwrap().inner_html(), + author: quote.select(&AUTHOR).next().unwrap().inner_html(), + tags: quote.select(&TAG).map(|e| e.inner_html()).collect(), + }) + .collect() +} + +fn main() { + let rt = Runtime::new().unwrap(); + let pool = Arc::new(Semaphore::new(MAX_TASK)); + let (tx, mut rx) = mpsc::unbounded_channel::(); + + for page in 1..20 { + let pool = Arc::clone(&pool); + let tx = tx.clone(); + rt.spawn(async move { + let _permit = pool.acquire().await.unwrap(); + let text = download_quote_html(page).await.unwrap(); + let html = Html::parse_document(&text); + let quotes = parse_quote_html(html); + for quote in quotes.into_iter() { + tx.send(quote).unwrap(); + } + }); + } + drop(tx); + + while let Some(quote) = rx.blocking_recv() { + println!("{:?}", quote); + } +}