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//! Worker
//!
//! Ideally, any intensive work *must* happen in the worker, to avoid locking up the main/UI thread
//! as much as possible.
//!
//! For now this only happens for markdown parsing, and image loading, resizing, and encoding.
//!
//! For example, text search could benefit from running in the worker, but it's not clear how the
//! text should then actually be shared.
pub mod sections;
use std::{
collections::HashMap,
path::PathBuf,
sync::{
Arc,
mpsc::{Receiver, Sender},
},
thread::{self, JoinHandle},
};
use mdfrier::MdFrier;
use ratatui_image::picker::Picker;
use reqwest::Client;
use tokio::{runtime::Builder, sync::RwLock};
use crate::{
Cmd, Event, Protocol,
config::Theme,
document::{SectionContent, header_images, header_sections, image_section},
error::Error,
model::DocumentId,
setup::FontRenderer,
worker::sections::{SectionEvent, SectionIterator},
};
#[expect(clippy::too_many_arguments)]
pub fn worker_thread(
basepath: Option<PathBuf>,
picker: Picker,
renderer: Option<Box<FontRenderer>>,
theme: Theme,
deep_fry: bool,
cmd_rx: Receiver<Cmd>,
event_tx: Sender<Event>,
config_max_image_height: u16,
) -> JoinHandle<Result<(), Error>> {
thread::spawn(move || {
let runtime = Builder::new_multi_thread()
.worker_threads(2)
.enable_all()
.build()?;
runtime.block_on(async {
let basepath = basepath.clone();
let client = Arc::new(RwLock::new(Client::new()));
// Specifically not a tokio Mutex, because we use it in spawn_blocking.
let thread_renderer =
renderer.map(|renderer| Arc::new(std::sync::Mutex::new(renderer)));
let thread_picker = Arc::new(picker);
let mut parser = MdFrier::new()?;
for cmd in cmd_rx {
log::debug!("Cmd: {cmd}");
match cmd {
Cmd::Parse(document_id, width, text, image_cache) => {
log::info!("Parse {document_id}");
event_tx.send(Event::NewDocument(document_id))?;
let lines = parser.parse(width, &text, &theme)?;
let mut section_iter = SectionIterator::new(lines, &theme);
let mut post_parse_events = Vec::new();
for section in &mut section_iter {
match §ion.content {
SectionContent::Lines(_) => {
event_tx.send(Event::Parsed(document_id, section))?;
}
SectionContent::Image(_, _) => {
unreachable!("SectionIterator produced Image");
}
SectionContent::ImagePlaceholder(link, _) => {
let section_id = section.id;
let link = link.clone();
event_tx.send(Event::Parsed(document_id, section))?;
post_parse_events.push(SectionEvent::Image(section_id, link));
},
SectionContent::Header(_, _, _) => {
if !theme.has_text_size_protocol.unwrap_or_default() {
unreachable!("SectionIterator produced Header without text-size-protocol");
}
event_tx.send(Event::Parsed(document_id, section))?;
}
SectionContent::HeaderPlaceholder(text,tier,_) => {
if theme.has_text_size_protocol.unwrap_or_default() {
unreachable!("SectionIterator produced HeaderPlaceholder with text-size-protocol");
}
let section_id = section.id;
let text = text.clone();
let tier = *tier;
event_tx.send(Event::Parsed(document_id, section))?;
if thread_renderer.is_some() {
post_parse_events.push(SectionEvent::Header(section_id, text, tier));
}
}
}
}
let section_id = section_iter.last_section_id();
// Send cached images synchronously before ParseDone
let mut image_cache = image_cache.unwrap_or_default();
let mut uncached_image_events = Vec::new();
for event in post_parse_events {
match &event {
SectionEvent::Image(
section_id,
link,
) => {
if let Some(proto) = image_cache.images.remove(&link.url) {
log::debug!("image cache hit: {}", link.url);
event_tx.send(Event::ImageLoaded(
document_id,
*section_id,
link.clone(),
proto,
))?;
} else {
uncached_image_events.push(event);
}
}
SectionEvent::Header(section_id, text, tier) => {
let key = (text.clone(), *tier);
if let Some(protos) = image_cache.headers.remove(&key) {
log::debug!("header cache hit: {text}");
event_tx.send(Event::HeaderLoaded(
document_id,
*section_id,
protos
.into_iter()
.map(|proto| (text.clone(), *tier, proto))
.collect(),
))?;
} else {
uncached_image_events.push(event);
}
}
}
}
event_tx.send(Event::ParseDone(document_id, section_id))?;
if !uncached_image_events.is_empty() {
process_image_events(
event_tx.clone(),
basepath.clone(),
client.clone(),
thread_picker.clone(),
thread_renderer.clone(),
width,
config_max_image_height,
deep_fry,
document_id,
uncached_image_events,
);
}
}
}
}
Ok::<(), Error>(())
})?;
Ok::<(), Error>(())
})
}
#[expect(clippy::too_many_arguments)]
fn process_image_events(
task_tx: Sender<Event>,
basepath: Option<PathBuf>,
client: Arc<RwLock<Client>>,
picker: Arc<Picker>,
font_renderer: Option<Arc<std::sync::Mutex<Box<FontRenderer>>>>,
width: u16,
config_max_image_height: u16,
deep_fry: bool,
document_id: DocumentId,
post_parse_events: Vec<SectionEvent>,
) {
// TODO: handle spawned task result errors, right now it's just discarded.
tokio::spawn(async move {
for event in post_parse_events {
match event {
SectionEvent::Image(section_id, url) => {
// Load fresh image
match image_section(
&picker,
config_max_image_height,
width,
&basepath,
client.clone(),
section_id,
url,
deep_fry,
)
.await
{
Ok(section) => {
let SectionContent::Image(link, proto) = section.content else {
unreachable!("image_section should return SectionContent::Image");
};
task_tx.send(Event::ImageLoaded(
document_id,
section_id,
link,
proto,
))?
}
Err(Error::UnknownImage(_id, link)) => {
log::error!("image_section UnknownImage: {link}");
// Leave the image line as-is (shows )
}
Err(err) => {
log::error!("image_section error: {err}");
// Leave the image line as-is (shows )
}
}
}
SectionEvent::Header(section_id, text, tier) => {
log::debug!("SectionEvent::Header: {text}");
let Some(font_renderer) = &font_renderer else {
panic!("should not have produced SectionEvent::Header without renderer");
};
let font_renderer = font_renderer.clone();
let images = tokio::task::spawn_blocking(move || {
let mut r = font_renderer.lock()?;
header_images(&mut r, width, text, tier, deep_fry)
})
.await??;
let picker = picker.clone();
let images = tokio::task::spawn_blocking(move || {
header_sections(&picker, width, images, deep_fry)
})
.await??;
task_tx.send(Event::HeaderLoaded(document_id, section_id, images))?;
}
}
}
Ok::<(), Error>(())
});
}
#[derive(Default)]
pub struct ImageCache {
pub images: HashMap<String, Protocol>,
pub headers: HashMap<(String, u8), Vec<Protocol>>,
}
impl ImageCache {
pub fn is_empty(&self) -> bool {
self.images.is_empty() && self.headers.is_empty()
}
}