commit 050138a9fb5fa3736e0171ccc253a15123fc7837
Author: hr567 <hr567@hr567.me>
Date:   Thu Jan 21 17:25:38 2021 +0800

    Initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f995c82
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "quote-scrape"
+version = "0.1.0"
+authors = ["hr567 <hr567@hr567.me>"]
+edition = "2018"
+
+[dependencies]
+lazy_static = "1.4.0"
+reqwest = "0.11.0"
+scraper = "0.12.0"
+tokio = { version = "1.0.2", features = [ "rt-multi-thread", "sync" ] }
+url = "2.2.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..bf45d64
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,80 @@
+use std::sync::Arc;
+
+use lazy_static::lazy_static;
+use reqwest::Client;
+use scraper::{Html, Selector};
+use 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<String>,
+}
+
+async fn download_quote_html(idx: usize) -> reqwest::Result<String> {
+    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<Quote> {
+    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(&QUOTE)
+        .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::<Quote>();
+
+    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);
+    }
+}