Render handout page on server
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This commit is contained in:
2025-11-04 19:15:35 -08:00
parent 62a3da195f
commit a9b782e704
11 changed files with 565 additions and 363 deletions

View File

@@ -21,7 +21,8 @@ emojis = { workspace = true }
strum = { workspace = true }
chrono = { workspace = true }
parking_lot = { workspace = true }
lru = { workspace = true }
lazy_static = { workspace = true }
serde_yaml = { workspace = true }
serde = { workspace = true }
reqwest = { workspace = true }
tokio = { workspace = true }

View File

@@ -1,6 +1,3 @@
// Handout list pages
// works with "{{ handout() }}" shortcode.
.handout-li-links {
color: var(--grey);
}
@@ -39,10 +36,6 @@
display: none;
}
.handout-star {
color: var(--yellow);
}
// Email obfuscation
// Works with "{{ email_*() }}" shortcodes.
.eobf {

View File

@@ -9,14 +9,19 @@ use axum::{
response::{IntoResponse, Response},
routing::get,
};
use chrono::{DateTime, Utc};
use chrono::{DateTime, TimeDelta, Utc};
use libservice::ServiceConnectInfo;
use lru::LruCache;
use markdown_it::Node;
use maud::{Markup, PreEscaped, Render, html};
use parking_lot::Mutex;
use parking_lot::{Mutex, RwLock};
use serde::Deserialize;
use std::{collections::HashMap, num::NonZero, sync::Arc, time::Duration};
use tracing::{debug, trace};
use std::{
collections::HashMap,
pin::Pin,
sync::Arc,
time::{Duration, Instant},
};
use tracing::{trace, warn};
use crate::components::{
md::{FrontMatter, Markdown},
@@ -70,6 +75,23 @@ impl Render for PageMetadata {
}
}
impl PageMetadata {
/// Try to read page metadata from a markdown file's frontmatter.
/// - returns `none` if there is no frontmatter
/// - returns an error if we fail to parse frontmatter
pub fn from_markdown_frontmatter(
root_node: &Node,
) -> Result<Option<PageMetadata>, serde_yaml::Error> {
root_node
.children
.get(0)
.map(|x| x.cast::<FrontMatter>())
.flatten()
.map(|x| serde_yaml::from_str::<PageMetadata>(&x.content))
.map_or(Ok(None), |v| v.map(Some))
}
}
//
// MARK: page
//
@@ -79,9 +101,10 @@ pub struct Page {
pub meta: PageMetadata,
/// How long this page's html may be cached.
/// This controls the maximum age of a page shown to the user.
///
/// If `None`, this page is always rendered from scratch.
pub html_ttl: Option<Duration>,
pub html_ttl: Option<TimeDelta>,
/// A function that generates this page's html.
///
@@ -89,41 +112,40 @@ pub struct Page {
/// or the contents of a wrapper element (defined in the page server struct).
///
/// This closure must never return `<html>` or `<head>`.
pub generate_html: Box<dyn Send + Sync + Fn(&Self) -> Markup>,
pub generate_html: Box<
dyn Send
+ Sync
+ for<'a> Fn(&'a Page) -> Pin<Box<dyn Future<Output = Markup> + 'a + Send + Sync>>,
>,
}
impl Default for Page {
fn default() -> Self {
Page {
meta: Default::default(),
html_ttl: Some(Duration::from_secs(60 * 24 * 30)),
html_ttl: Some(TimeDelta::seconds(60 * 24 * 30)),
//css_ttl: Duration::from_secs(60 * 24 * 30),
//generate_css: None,
generate_html: Box::new(|_| html!()),
generate_html: Box::new(|_| Box::pin(async { html!() })),
}
}
}
impl Page {
pub fn generate_html(&self) -> Markup {
(self.generate_html)(self)
pub async fn generate_html(&self) -> Markup {
(self.generate_html)(self).await
}
pub fn from_markdown(md: impl Into<String>, default_image: Option<String>) -> Self {
let md: String = md.into();
let md = Markdown::parse(&md);
let mut meta = md
.children
.get(0)
.map(|x| x.cast::<FrontMatter>())
.flatten()
.map(|x| serde_yaml::from_str::<PageMetadata>(&x.content))
.unwrap_or(Ok(Default::default()))
.unwrap_or(PageMetadata {
let mut meta = PageMetadata::from_markdown_frontmatter(&md)
.unwrap_or(Some(PageMetadata {
title: "Invalid frontmatter!".into(),
..Default::default()
});
}))
.unwrap_or(Default::default());
if meta.image.is_none() {
meta.image = default_image
@@ -134,13 +156,16 @@ impl Page {
Page {
meta,
generate_html: Box::new(move |page| {
html! {
@if let Some(slug) = &page.meta.slug {
(Backlinks(&[("/", "home")], slug))
}
let html = html.clone();
Box::pin(async move {
html! {
@if let Some(slug) = &page.meta.slug {
(Backlinks(&[("/", "home")], slug))
}
(html)
}
(html)
}
})
}),
..Default::default()
@@ -153,35 +178,50 @@ impl Page {
//
pub struct PageServer {
/// If true, expired pages will be rerendered before being sent to the user.
/// If false, requests never trigger rerenders. We rely on the rerender task.
///
/// If true, we deliver fresher pages but delay responses.
/// TODO: replace this with a smarter rendering strategy?
never_rerender_on_request: bool,
/// Map of `{ route: page }`
pages: HashMap<String, Page>,
pages: Arc<Mutex<HashMap<String, Arc<Page>>>>,
/// Map of `{ route: (page data, expire time) }`
///
/// We use an LruCache for bounded memory usage.
html_cache: Mutex<LruCache<String, (String, DateTime<Utc>)>>,
html_cache: RwLock<HashMap<String, (String, DateTime<Utc>)>>,
/// Called whenever we need to render a page.
/// - this method should call `page.generate_html()`,
/// - wrap the result in `<html><body>`,
/// - and add `<head>`
/// ```
render_page: Box<dyn Send + Sync + Fn(&Page) -> Markup>,
render_page: Box<
dyn Send
+ Sync
+ for<'a> Fn(&'a Page) -> Pin<Box<dyn Future<Output = Markup> + 'a + Send + Sync>>,
>,
}
impl PageServer {
pub fn new(page_wrapper: Box<dyn Send + Sync + Fn(&Page) -> Markup>) -> Self {
#[expect(clippy::unwrap_used)]
let cache_size = LruCache::new(NonZero::new(128).unwrap());
Self {
pages: HashMap::new(),
html_cache: Mutex::new(cache_size),
render_page: Box::new(page_wrapper),
}
pub fn new(
render_page: Box<
dyn Send
+ Sync
+ for<'a> Fn(&'a Page) -> Pin<Box<dyn Future<Output = Markup> + 'a + Send + Sync>>,
>,
) -> Arc<Self> {
Arc::new(Self {
pages: Arc::new(Mutex::new(HashMap::new())),
html_cache: RwLock::new(HashMap::new()),
render_page,
never_rerender_on_request: true,
})
}
pub fn add_page(mut self, route: impl Into<String>, page: Page) -> Self {
pub fn add_page(&self, route: impl Into<String>, page: Page) -> &Self {
#[expect(clippy::expect_used)]
let route = route
.into()
@@ -189,24 +229,79 @@ impl PageServer {
.expect("page route must start with /")
.to_owned();
self.pages.insert(route, page);
self.pages.lock().insert(route, Arc::new(page));
self
}
/// Re-render the page at `route`, regardless of cache state.
/// Does nothing if there is no page at `route`.
///
/// Returns the rendered page's content.
async fn render_page(&self, reason: &'static str, route: &str) -> Option<String> {
let now = Utc::now();
let start = Instant::now();
trace!(message = "Rendering page", route, reason);
let page = match self.pages.lock().get(route) {
Some(x) => x.clone(),
None => {
warn!(message = "Not rerendering, no such route", route, reason);
return None;
}
};
let html = (self.render_page)(&*page).await.0;
if let Some(ttl) = page.html_ttl {
self.html_cache
.write()
.insert(route.to_owned(), (html.clone(), now + ttl));
}
let elapsed = start.elapsed().as_millis();
trace!(message = "Rendered page", route, reason, time_ms = elapsed);
return Some(html);
}
// Rerender considerations:
// - rerendering often in the background is wasteful. Maybe we should fall asleep?
// - rerendering on request is slow
// - rerendering in the background after a request could be a good idea. Maybe implement?
//
// - cached pages only make sense for static assets.
// - user pages can't be pre-rendered!
pub async fn start_rerender_task(self: Arc<Self>, interval: Duration) {
loop {
tokio::time::sleep(interval).await;
let now = Utc::now();
let pages = self
.pages
.lock()
.iter()
.filter(|(_, v)| v.html_ttl.is_some())
.map(|(k, _)| k.clone())
.collect::<Vec<_>>();
for route in pages {
let needs_render = match self.html_cache.read().get(&route) {
Some(x) => x.1 < now, // Expired
None => true, // Never rendered
};
if needs_render {
self.render_page("rerender_task", &route).await;
}
}
}
}
async fn handler(
Path(path): Path<String>,
Path(route): Path<String>,
State(state): State<Arc<Self>>,
ConnectInfo(addr): ConnectInfo<ServiceConnectInfo>,
) -> Response {
trace!("Serving {path} to {}", addr.addr);
let page = match state.pages.get(&path) {
Some(x) => x,
// TODO: 404 page
None => return (StatusCode::NOT_FOUND, "page doesn't exist").into_response(),
};
trace!("Serving {route} to {}", addr.addr);
let now = Utc::now();
let headers = [(
@@ -214,30 +309,28 @@ impl PageServer {
HeaderValue::from_static("text/html; charset=utf-8"),
)];
if let Some((html, expires)) = state.html_cache.lock().get(&path)
&& *expires > now
if let Some((html, expires)) = state.html_cache.read().get(&route)
&& (*expires > now || state.never_rerender_on_request)
{
// TODO: no clone?
return (headers, html.clone()).into_response();
};
debug!("Rendering {path}");
let html = (state.render_page)(page).0;
let html = match state.render_page("request", &route).await {
Some(x) => x.clone(),
None => return (StatusCode::NOT_FOUND, "page doesn't exist").into_response(),
};
if let Some(ttl) = page.html_ttl {
state.html_cache.lock().put(path, (html.clone(), now + ttl));
}
return (headers, html.clone()).into_response();
return (headers, html).into_response();
}
pub fn into_router(self) -> Router<()> {
pub fn into_router(self: Arc<Self>) -> Router<()> {
Router::new()
.route(
"/",
get(|state, conn| async { Self::handler(Path(String::new()), state, conn).await }),
)
.route("/{*path}", get(Self::handler))
.with_state(Arc::new(self))
.with_state(self)
}
}

View File

@@ -36,197 +36,3 @@ If the class finishes early, the lesson is either too short or too easy.
<br></br>
<hr></hr>
<br></br>
## Warm-Ups
Students never show up on time. Some come early, some come late. Warm-ups
are my solution to this problem: we hand these out as students walk in,
giving them something to do until we can start the lesson.
<ul id="handout-ul-Warm-Ups" class="handout-ul"></ul>
<script>
fetch("https://git.betalupi.com/api/packages/Mark/generic/ormc-handouts/latest/index.json")
.then(res => res.json())
.then(out => {
out = out.sort((a, b) => (
a["title"].toLowerCase() < b["title"].toLowerCase()
));
out.forEach(element => {
if (element["group"] != "Warm-Ups") { return }
// Handout title
const title = document.createElement("span");
const title_a = document.createElement("strong");
title_a.appendChild(document.createTextNode(element["title"] + " "));
title.appendChild(title_a)
title.classList.add("handout-li-title");
// Handout title
const desc = document.createElement("span");
desc.appendChild(document.createTextNode(element["description"]));
desc.classList.add("handout-li-desc");
const handout_link = element["handout"];
const solutions_link = element["solutions"];
const links = document.createElement("span");
links.classList.add("handout-li-links");
const h = document.createElement("a");
h.appendChild(document.createTextNode("handout"))
h.href = handout_link;
if (solutions_link === null) {
links.appendChild(document.createTextNode("[ "));
links.appendChild(h);
links.appendChild(document.createTextNode(" ]"));
} else {
var s = document.createElement("a");
s.appendChild(document.createTextNode("solutions"))
s.href = solutions_link;
links.appendChild(document.createTextNode("[ "));
links.appendChild(h);
links.appendChild(document.createTextNode(" | "));
links.appendChild(s);
links.appendChild(document.createTextNode(" ]"));
}
// Add to main list
const item = document.createElement("li");
item.appendChild(title)
item.appendChild(links);
//item.appendChild(desc)
const list = document.getElementById("handout-ul-Warm-Ups");
list.insertBefore(item, list.children[0]);
})}
)
.catch(err => {
// Print fallback link if we failed to load json index
console.log(err)
const title = document.createElement("span");
const title_a = document.createElement("strong");
title_a.appendChild(document.createTextNode("Error: "));
title.appendChild(title_a)
title.appendChild(document.createTextNode("failed to load handouts, something broke."))
title.classList.add("handout-li-title");
const fallback = "https://git.betalupi.com/Mark/-/packages/generic/ormc-handouts/latest";
const link = document.createElement("a");
link.href = fallback
link.appendChild(document.createTextNode("ormc-handouts"));
const item_a = document.createElement("li");
item_a.appendChild(title)
const item_b = document.createElement("li");
item_b.appendChild(document.createTextNode("Fallback link: "))
item_b.appendChild(link)
const list = document.getElementById("handout-ul-Warm-Ups");
list.insertBefore(item_b, list.children[0]);
list.insertBefore(item_a, list.children[0]);
});
</script>
<br></br>
## Advanced
The highest level of the ORMC, and the group I spend most of my time with.
Students in ORMC Advanced are in high school, which means
they're ~14-18 years old.
<ul id="handout-ul-Advanced" class="handout-ul"></ul>
<script>
fetch("https://git.betalupi.com/api/packages/Mark/generic/ormc-handouts/latest/index.json")
.then(res => res.json())
.then(out => {
out = out.sort((a, b) => (
a["title"].toLowerCase() < b["title"].toLowerCase()
));
out.forEach(element => {
if (element["group"] != "Advanced") { return }
// Handout title
const title = document.createElement("span");
const title_a = document.createElement("strong");
title_a.appendChild(document.createTextNode(element["title"] + " "));
title.appendChild(title_a)
title.classList.add("handout-li-title");
// Handout title
const desc = document.createElement("span");
desc.appendChild(document.createTextNode(element["description"]));
desc.classList.add("handout-li-desc");
const handout_link = element["handout"];
const solutions_link = element["solutions"];
const links = document.createElement("span");
links.classList.add("handout-li-links");
const h = document.createElement("a");
h.appendChild(document.createTextNode("handout"))
h.href = handout_link;
if (solutions_link === null) {
links.appendChild(document.createTextNode("[ "));
links.appendChild(h);
links.appendChild(document.createTextNode(" ]"));
} else {
var s = document.createElement("a");
s.appendChild(document.createTextNode("solutions"))
s.href = solutions_link;
links.appendChild(document.createTextNode("[ "));
links.appendChild(h);
links.appendChild(document.createTextNode(" | "));
links.appendChild(s);
links.appendChild(document.createTextNode(" ]"));
}
// Add to main list
const item = document.createElement("li");
item.appendChild(title)
item.appendChild(links);
//item.appendChild(desc)
const list = document.getElementById("handout-ul-Advanced");
list.insertBefore(item, list.children[0]);
})}
)
.catch(err => {
// Print fallback link if we failed to load json index
console.log(err)
const title = document.createElement("span");
const title_a = document.createElement("strong");
title_a.appendChild(document.createTextNode("Error: "));
title.appendChild(title_a)
title.appendChild(document.createTextNode("failed to load handouts, something broke."))
title.classList.add("handout-li-title");
const fallback = "https://git.betalupi.com/Mark/-/packages/generic/ormc-handouts/latest";
const link = document.createElement("a");
link.href = fallback
link.appendChild(document.createTextNode("ormc-handouts"));
const item_a = document.createElement("li");
item_a.appendChild(title)
const item_b = document.createElement("li");
item_b.appendChild(document.createTextNode("Fallback link: "))
item_b.appendChild(link)
const list = document.getElementById("handout-ul-Advanced");
list.insertBefore(item_b, list.children[0]);
list.insertBefore(item_a, list.children[0]);
});
</script>
<br></br>

View File

@@ -0,0 +1,133 @@
use std::time::Instant;
use assetserver::Asset;
use chrono::TimeDelta;
use maud::{Markup, PreEscaped, html};
use serde::Deserialize;
use tracing::{debug, warn};
use crate::{
components::{md::Markdown, misc::Backlinks},
page::{Page, PageMetadata},
routes::assets::Image_Icon,
};
#[derive(Debug, Deserialize)]
struct HandoutEntry {
title: String,
group: String,
handout: String,
solutions: Option<String>,
}
async fn get_index() -> Result<Vec<HandoutEntry>, reqwest::Error> {
let start = Instant::now();
let res = reqwest::get(
"https://git.betalupi.com/api/packages/Mark/generic/ormc-handouts/latest/index.json",
)
.await;
let res = match res {
Ok(x) => x,
Err(err) => {
warn!("Error while getting index: {err:?}");
return Err(err);
}
};
let mut res: Vec<HandoutEntry> = res.json().await?;
res.sort_by_key(|x| x.title.clone());
debug!(
message = "Fetched handout index",
n_handouts = res.len(),
time_ms = start.elapsed().as_millis()
);
return Ok(res);
}
fn build_list_for_group(handouts: &[HandoutEntry], group: &str) -> Markup {
html! {
ul class="handout-ul" {
@for h in handouts {
@if h.group ==group {
li {
span class="handdout-li-title" {
strong { (h.title) }
}
span class="handout-li-links" {
"[ "
@if let Some(solutions) = &h.solutions {
a href=(h.handout) {"handout"}
" | "
a href=(solutions) {"solutions"}
} @else {
a href=(h.handout) {"handout"}
}
"] "
}
}
}
}
}
}
}
//
// MARK: page
//
pub fn handouts() -> Page {
let md = Markdown::parse(include_str!("handouts.md"));
let mut meta = PageMetadata::from_markdown_frontmatter(&md)
.unwrap()
.unwrap();
if meta.image.is_none() {
meta.image = Some(Image_Icon::URL.to_string());
}
let html = PreEscaped(md.render());
Page {
meta,
html_ttl: Some(TimeDelta::seconds(300)),
generate_html: Box::new(move |page| {
let html = html.clone(); // TODO: find a way to not clone here
Box::pin(async move {
let handouts = get_index().await.unwrap();
html! {
@if let Some(slug) = &page.meta.slug {
(Backlinks(&[("/", "home")], slug))
}
(html)
(Markdown(concat!(
"## Warm-Ups",
"\n\n",
"Students never show up on time. Some come early, some come late. Warm-ups ",
"are my solution to this problem: we hand these out as students walk in, ",
"giving them something to do until we can start the lesson.",
)))
(build_list_for_group(&handouts, "Warm-Ups"))
br {}
(Markdown(concat!(
"## Advanced",
"\n\n",
"The highest level of the ORMC, and the group I spend most of my time with. ",
"Students in ORMC Advanced are in high school, which means ",
"they're ~14-18 years old.",
)))
(build_list_for_group(&handouts, "Advanced"))
br {}
}
})
}),
}
}

View File

@@ -23,53 +23,55 @@ pub fn index() -> Page {
},
generate_html: Box::new(move |_page| {
html! {
h2 id="about" { "About" }
Box::pin(async {
html! {
h2 id="about" { "About" }
div {
img
src=(Image_Cover::URL)
style="float:left;margin:10px 10px 10px 10px;display:block;width:25%;"
{}
div {
img
src=(Image_Cover::URL)
style="float:left;margin:10px 10px 10px 10px;display:block;width:25%;"
{}
div style="margin:2ex 1ex 2ex 1ex;display:inline-block;overflow:hidden;width:60%;" {
"Welcome, you've reached Mark's main page. Here you'll find"
" links to various projects I've worked on."
div style="margin:2ex 1ex 2ex 1ex;display:inline-block;overflow:hidden;width:60%;" {
"Welcome, you've reached Mark's main page. Here you'll find"
" links to various projects I've worked on."
ul {
li { (MangledBetaEmail {}) }
li { (MangledGoogleEmail {}) }
ul {
li { (MangledBetaEmail {}) }
li { (MangledGoogleEmail {}) }
li {
(
FarLink(
"https://github.com/rm-dr",
html!(
(FAIcon::Github)
"rm-dr"
li {
(
FarLink(
"https://github.com/rm-dr",
html!(
(FAIcon::Github)
"rm-dr"
)
)
)
)
}
}
li {
(
FarLink(
"https://git.betalupi.com",
html!(
(FAIcon::Git)
"git.betalupi.com"
li {
(
FarLink(
"https://git.betalupi.com",
html!(
(FAIcon::Git)
"git.betalupi.com"
)
)
)
)
}
}
}
br style="clear:both;" {}
}
br style="clear:both;" {}
}
(Markdown(include_str!("index.md")))
}
(Markdown(include_str!("index.md")))
}
})
}),
..Default::default()
}

View File

@@ -1,9 +1,13 @@
mod index;
use assetserver::Asset;
pub use index::index;
use crate::{page::Page, routes::assets::Image_Icon};
mod handouts;
mod index;
pub use handouts::handouts;
pub use index::index;
pub fn links() -> Page {
/*
Dead links:
@@ -21,10 +25,3 @@ pub fn betalupi() -> Page {
Some(Image_Icon::URL.to_string()),
)
}
pub fn handouts() -> Page {
Page::from_markdown(
include_str!("handouts.md"),
Some(Image_Icon::URL.to_string()),
)
}

View File

@@ -1,3 +1,5 @@
use std::{pin::Pin, sync::Arc, time::Duration};
use assetserver::Asset;
use axum::Router;
use maud::{DOCTYPE, Markup, PreEscaped, html};
@@ -16,59 +18,65 @@ pub(super) fn router() -> Router<()> {
let (asset_prefix, asset_router) = assets::asset_router();
info!("Serving assets at {asset_prefix}");
let server = build_server().into_router();
let server = build_server();
tokio::task::spawn(server.clone().start_rerender_task(Duration::from_secs(3)));
let router = server.into_router();
Router::new().merge(server).nest(asset_prefix, asset_router)
Router::new().merge(router).nest(asset_prefix, asset_router)
}
fn build_server() -> PageServer {
PageServer::new(Box::new(page_wrapper))
fn build_server() -> Arc<PageServer> {
let server = PageServer::new(Box::new(page_wrapper));
server
.add_page("/", pages::index())
.add_page("/links", pages::links())
.add_page("/whats-a-betalupi", pages::betalupi())
.add_page("/handouts", pages::handouts())
.add_page("/handouts", pages::handouts());
server
}
fn page_wrapper(page: &Page) -> Markup {
html! {
(DOCTYPE)
html {
head {
meta charset="UTF" {}
meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" {}
meta content="text/html; charset=UTF-8" http-equiv="content-type" {}
meta property="og:type" content="website" {}
fn page_wrapper<'a>(page: &'a Page) -> Pin<Box<dyn Future<Output = Markup> + 'a + Send + Sync>> {
Box::pin(async move {
html! {
(DOCTYPE)
html {
head {
meta charset="UTF" {}
meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" {}
meta content="text/html; charset=UTF-8" http-equiv="content-type" {}
meta property="og:type" content="website" {}
link rel="stylesheet" href=(Styles_Main::URL) {}
link rel="stylesheet" href=(Styles_Main::URL) {}
(&page.meta)
title { (PreEscaped(page.meta.title.clone())) }
}
(&page.meta)
title { (PreEscaped(page.meta.title.clone())) }
}
body {
div class="wrapper" {
main { ( page.generate_html() ) }
body {
div class="wrapper" {
main { ( page.generate_html().await ) }
footer {
hr class = "footline" {}
div class = "footContainer" {
p {
"This site was built by hand using "
(FarLink("https://rust-lang.org", "Rust"))
", "
(FarLink("https://maud.lambda.xyz", "Maud"))
", "
(FarLink("https://github.com/connorskees/grass", "Grass"))
", and "
(FarLink("https://docs.rs/axum/latest/axum", "Axum"))
"."
footer {
hr class = "footline" {}
div class = "footContainer" {
p {
"This site was built by hand using "
(FarLink("https://rust-lang.org", "Rust"))
", "
(FarLink("https://maud.lambda.xyz", "Maud"))
", "
(FarLink("https://github.com/connorskees/grass", "Grass"))
", and "
(FarLink("https://docs.rs/axum/latest/axum", "Axum"))
"."
}
}
}
}
}
}
}
}
})
}
#[test]