217 lines
5.1 KiB
Rust
217 lines
5.1 KiB
Rust
//
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// MARK: metadata
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//
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use axum::{
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Router,
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extract::{ConnectInfo, Path, State},
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http::{HeaderValue, StatusCode, header},
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response::{IntoResponse, Response},
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routing::get,
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};
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use chrono::{DateTime, Utc};
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use libservice::ServiceConnectInfo;
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use lru::LruCache;
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use maud::{Markup, Render, html};
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use parking_lot::Mutex;
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use std::{collections::HashMap, num::NonZero, sync::Arc, time::Duration};
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use tracing::{debug, trace};
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use crate::components::{md::Markdown, misc::Backlinks};
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#[derive(Debug, Clone, Hash, PartialEq, Eq)]
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pub struct PageMetadata {
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pub title: String,
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pub author: Option<String>,
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pub description: Option<String>,
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pub image: Option<String>,
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}
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impl Default for PageMetadata {
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fn default() -> Self {
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Self {
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title: "Untitled page".into(),
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author: None,
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description: None,
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image: None,
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}
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}
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}
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impl Render for PageMetadata {
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fn render(&self) -> Markup {
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let empty = String::new();
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let title = &self.title;
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let author = &self.author.as_ref().unwrap_or(&empty);
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let description = &self.description.as_ref().unwrap_or(&empty);
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let image = &self.image.as_ref().unwrap_or(&empty);
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html !(
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meta property="og:site_name" content=(title) {}
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meta name="title" content=(title) {}
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meta property="og:title" content=(title) {}
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meta property="twitter:title" content=(title) {}
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meta name="author" content=(author) {}
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meta name="description" content=(description) {}
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meta property="og:description" content=(description) {}
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meta property="twitter:description" content=(description) {}
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meta content=(image) property="og:image" {}
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link rel="shortcut icon" href=(image) type="image/x-icon" {}
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)
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}
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}
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//
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// MARK: page
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//
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// Some HTML
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pub struct Page {
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pub meta: PageMetadata,
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/// How long this page's html may be cached.
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///
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/// If `None`, this page is always rendered from scratch.
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pub html_ttl: Option<Duration>,
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/// A function that generates this page's html.
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///
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/// This should return the contents of this page's <body> tag,
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/// or the contents of a wrapper element (defined in the page server struct).
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///
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/// This closure must never return `<html>` or `<head>`.
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pub generate_html: Box<dyn Send + Sync + Fn(&Self) -> Markup>,
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}
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impl Default for Page {
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fn default() -> Self {
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Page {
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meta: Default::default(),
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html_ttl: Some(Duration::from_secs(60 * 24 * 30)),
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//css_ttl: Duration::from_secs(60 * 24 * 30),
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//generate_css: None,
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generate_html: Box::new(|_| html!()),
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}
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}
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}
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impl Page {
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pub fn generate_html(&self) -> Markup {
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(self.generate_html)(self)
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}
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pub fn from_markdown(meta: PageMetadata, md: impl Into<String>) -> Self {
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let md: String = md.into();
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// TODO: define metadata and backlinks in markdown
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Page {
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meta,
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generate_html: Box::new(move |page| {
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html! {
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(Backlinks(&[("/", "home")], &page.meta.title))
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(Markdown(&md))
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}
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}),
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..Default::default()
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}
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}
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}
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//
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// MARK: server
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//
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pub struct PageServer {
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/// Map of `{ route: page }`
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pages: HashMap<String, Page>,
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/// Map of `{ route: (page data, expire time) }`
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///
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/// We use an LruCache for bounded memory usage.
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html_cache: Mutex<LruCache<String, (String, DateTime<Utc>)>>,
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/// Called whenever we need to render a page.
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/// - this method should call `page.generate_html()`,
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/// - wrap the result in `<html><body>`,
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/// - and add `<head>`
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/// ```
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render_page: Box<dyn Send + Sync + Fn(&Page) -> Markup>,
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}
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impl PageServer {
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pub fn new(page_wrapper: Box<dyn Send + Sync + Fn(&Page) -> Markup>) -> Self {
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#[expect(clippy::unwrap_used)]
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let cache_size = LruCache::new(NonZero::new(128).unwrap());
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Self {
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pages: HashMap::new(),
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html_cache: Mutex::new(cache_size),
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render_page: Box::new(page_wrapper),
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}
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}
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pub fn add_page(mut self, route: impl Into<String>, page: Page) -> Self {
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#[expect(clippy::expect_used)]
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let route = route
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.into()
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.strip_prefix("/")
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.expect("page route must start with /")
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.to_owned();
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self.pages.insert(route, page);
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self
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}
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async fn handler(
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Path(path): Path<String>,
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State(state): State<Arc<Self>>,
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ConnectInfo(addr): ConnectInfo<ServiceConnectInfo>,
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) -> Response {
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trace!("Serving {path} to {}", addr.addr);
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let page = match state.pages.get(&path) {
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Some(x) => x,
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// TODO: 404 page
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None => return (StatusCode::NOT_FOUND, "page doesn't exist").into_response(),
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};
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let now = Utc::now();
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let headers = [(
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header::CONTENT_TYPE,
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HeaderValue::from_static("text/html; charset=utf-8"),
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)];
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if let Some((html, expires)) = state.html_cache.lock().get(&path)
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&& *expires > now
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{
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// TODO: no clone?
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return (headers, html.clone()).into_response();
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};
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debug!("Rendering {path}");
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let html = (state.render_page)(page).0;
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if let Some(ttl) = page.html_ttl {
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state.html_cache.lock().put(path, (html.clone(), now + ttl));
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}
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return (headers, html.clone()).into_response();
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}
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pub fn into_router(self) -> Router<()> {
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Router::new()
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.route(
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"/",
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get(|state, conn| async { Self::handler(Path(String::new()), state, conn).await }),
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)
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.route("/{*path}", get(Self::handler))
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.with_state(Arc::new(self))
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}
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}
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