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Makefile
View file

@ -39,7 +39,11 @@ frontend: $(PUBLIC_DIR)/index.html $(PUBLIC_DIR)
# Backend build target
backend:
ifeq ($(DEBUG),1)
$(CARGO_BUILD) --manifest-path=$(BACKEND_DIR)/Cargo.toml
else ifeq ($(RELEASE),1)
$(CARGO_BUILD) --release --manifest-path=$(BACKEND_DIR)/Cargo.toml
endif
# Clean target (optional, assuming we want to remove build artifacts)
clean:
@ -47,11 +51,7 @@ clean:
# Serve: Runs both frontend and backend
serve: frontend backend
ifeq ($(DEBUG),1)
$(MAKE) -C $(FRONTEND_DIR) serve DEBUG=1 & \
$(MAKE) -C $(FRONTEND_DIR) watch DEBUG=1 & \
FRONTEND_PID=$$!; \
RUST_LOG=info,actix_web=debug $(CARGO_RUN) --manifest-path=$(BACKEND_DIR)/Cargo.toml; \
kill $$FRONTEND_PID
else ifeq ($(RELEASE),1)
$(CARGO_RUN) --release --manifest-path=$(BACKEND_DIR)/Cargo.toml
endif
kill $$FRONTEND_PID

30
README.md
View file

@ -1,24 +1,30 @@
# About
Example demonstrating how one might architect a single page application
Elm app.
A tool that lets you remotely try new exotic hardware such as Tenstorrent Wormhole or SiFive P550 Dev board from the comfort of your browser.
Licensed under GPLV3.
# Building
```bash
nix-shell
nix-shell -p elmPackages.elm cargo uglify-js
make serve RELEASE=1 # can also do DEBUG=1 instead
```
Now open `http://127.0.0.1:8080` in your browser.
# Elm application hot reloading
Hot reloading for Elm application is exposed at port `8000` under `DEBUG=1` mode.
`make serve DEBUG=1`
visit `localhost:8000`
# TODO
- [ ] Address compiler warnings.
- [ ] Binding to `0.0.0.0` should not be default behavior.
- [ ] Rename `term.rs` to `terminal.rs` unless there is a good reason not to.
- [ ] Move to `actix-ws`
- [ ] Use [`spawn_local`][discord_chat] instead of `addr.do_send`
- [ ] Re-factor if and else branches of `term::msg_handler`
- [ ] Stopping the websocket should terminate terminal. The ergonomic way
to do this is to have each widget provision its own stop handler.
- [ ] Reduce warnings, especially from unused imports.
- [ ] Implement logic for `CloseTerm` UpMsg for terminal
- [ ] Implement terminal
- [ ] Start by simply adding new term page
- [ ] Close websocket after 15s of no response(from frontend) to websocket pings
- [ ] Implement dark mode
[discord_chat]: https://discord.com/channels/771444961383153695/771447545154371646/1327308910654259291

8
backend/src/landing.rs
View file

@ -1,5 +1,5 @@
use actix_web_actors::ws::WebsocketContext;
use elm_rs::{Elm, ElmEncode, ElmDecode};
use elm_rs::{Elm, ElmDecode, ElmEncode};
use serde::{Deserialize, Serialize};
type BackendType = crate::TryItBackend;
@ -15,11 +15,7 @@ pub enum LandingUpMsg {
RequestGreet(String),
}
pub fn cleanup(
actor_instance: &mut BackendType,
ctx: &mut WebsocketContext<BackendType>,
) {
}
pub fn cleanup(actor_instance: &mut BackendType, ctx: &mut WebsocketContext<BackendType>) {}
pub fn msg_handler(
msg: LandingUpMsg,

38
backend/src/main.rs
View file

@ -1,16 +1,14 @@
use actix_web::middleware::Compress;
use actix::prelude::*;
use actix_files::Files;
use actix_web::{web, App, Error, HttpRequest, HttpResponse, HttpServer, middleware};
use actix_web::middleware::Compress;
use actix_web::{middleware, web, App, Error, HttpRequest, HttpResponse, HttpServer};
use actix_web_actors::ws;
use chrono::Local;
use log::info;
use serde::{Deserialize, Serialize};
use std::{fs, os::unix::fs::PermissionsExt, time::Duration};
use std::{fs, time::Duration};
use elm_rs::{Elm, ElmEncode, ElmDecode};
use std::time::Instant;
use elm_rs::{Elm, ElmDecode, ElmEncode};
mod landing;
mod term;
@ -31,7 +29,7 @@ enum UpMsg {
pub struct TryItBackend {
addr: Option<Addr<TryItBackend>>,
graceful_stop: bool
graceful_stop: bool,
}
fn do_elm_gen() {
@ -43,7 +41,8 @@ fn do_elm_gen() {
decoders: [DownMsg,
term::TermDownMsg, term::TerminalScreen, term::Cursor, term::Line,
landing::LandingDownMsg]
}).unwrap();
})
.unwrap();
let output = String::from_utf8(encode_decode_top).unwrap();
fs::write("../frontend/src/EncodeDecode.elm", output).unwrap();
}
@ -57,13 +56,13 @@ impl Actor for TryItBackend {
self.addr = Some(addr);
ctx.run_interval(Duration::from_secs(1), |_, ctx| {
let current_time = Local::now().format("%H:%M:%S").to_string();
let message = DownMsg::LandingDownMsg(landing::LandingDownMsg::TimeUpdate(current_time));
let message =
DownMsg::LandingDownMsg(landing::LandingDownMsg::TimeUpdate(current_time));
if let Ok(json_message) = serde_json::to_string(&message) {
ctx.text(json_message);
}
});
}
fn stopped(&mut self, ctx: &mut Self::Context) {
@ -72,7 +71,6 @@ impl Actor for TryItBackend {
term::cleanup(self, ctx);
}
}
}
impl actix::Handler<DownMsg> for TryItBackend {
@ -114,7 +112,6 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for TryItBackend {
}
impl TryItBackend {
fn send_down_msg(&self, down_msg: DownMsg, ctx: &mut ws::WebsocketContext<Self>) {
if let Ok(serialized_msg) = serde_json::to_string(&down_msg) {
ctx.text(serialized_msg);
@ -125,7 +122,10 @@ impl TryItBackend {
}
async fn websocket_handler(req: HttpRequest, stream: web::Payload) -> Result<HttpResponse, Error> {
let try_it_backend = TryItBackend { addr: None, graceful_stop: false };
let try_it_backend = TryItBackend {
addr: None,
graceful_stop: false,
};
ws::start(try_it_backend, &req, stream)
}
@ -155,10 +155,14 @@ async fn main() -> std::io::Result<()> {
HttpServer::new(|| {
App::new()
.wrap(Compress::default())
.wrap(middleware::DefaultHeaders::new()
.add(("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0"))
.add(("Pragma", "no-cache"))
.add(("Expires", "0"))
.wrap(
middleware::DefaultHeaders::new()
.add((
"Cache-Control",
"no-store, no-cache, must-revalidate, max-age=0",
))
.add(("Pragma", "no-cache"))
.add(("Expires", "0")),
)
.route("/ws/", web::get().to(websocket_handler)) // WebSocket endpoint
.service(Files::new("/assets", "./public/assets"))

182
backend/src/term.rs
View file

@ -3,27 +3,26 @@ use actix_web_actors::ws::WebsocketContext;
use serde::{Deserialize, Serialize};
use crate::terminal_size;
use actix::AsyncContext;
use alacritty_terminal::event::Notify;
use alacritty_terminal::event::{Event, EventListener};
use alacritty_terminal::event_loop::{EventLoop, EventLoopSender, Msg, Notifier};
use alacritty_terminal::event_loop::{EventLoop, Msg, Notifier};
use alacritty_terminal::sync::FairMutex;
use alacritty_terminal::term::cell::Cell;
use alacritty_terminal::term::{self, Term as Terminal};
use alacritty_terminal::{tty, Grid};
use actix::AsyncContext;
use elm_rs::{Elm, ElmEncode, ElmDecode};
use elm_rs::{Elm, ElmDecode, ElmEncode};
// use tokio::sync::mpsc;
use std::collections::HashMap;
use std::fmt::format;
use std::sync::LazyLock;
use std::sync::{Arc, RwLock};
use std::thread;
type BackendType = crate::TryItBackend;
const max_terminals: usize = 9;
const MAX_TERMINALS: usize = 9;
static TERM_SESSION_BY_ACTOR: LazyLock<
RwLock<HashMap<Addr<BackendType>, Arc<RwLock<TerminalSession>>>>,
@ -48,7 +47,7 @@ pub enum TermDownMsg {
#[derive(Serialize, Debug, Elm, ElmDecode, PartialEq, Clone)]
pub struct Line {
pub line: i32,
pub content: String
pub content: String,
}
#[derive(Serialize, Debug, Elm, ElmDecode)]
@ -63,7 +62,7 @@ pub struct TerminalScreen {
pub rows: usize,
pub damaged_lines: Vec<Line>,
// (line, col)
pub cursor_loc: Cursor
pub cursor_loc: Cursor,
}
struct TerminalSession {
@ -78,7 +77,7 @@ struct TerminalSession {
}
#[derive(Clone)]
pub struct EventProxy{
pub struct EventProxy {
channel: std::sync::mpsc::Sender<Event>,
}
@ -88,16 +87,19 @@ impl EventListener for EventProxy {
}
}
pub fn cleanup(
actor_instance: &mut BackendType,
ctx: &mut WebsocketContext<BackendType>,
) {
pub fn cleanup(actor_instance: &mut BackendType, ctx: &mut WebsocketContext<BackendType>) {
if let Some(actor_id) = actor_instance.addr.clone() {
if term_session_already_registered_in_hashmap(&actor_id) {
let mut sessions = TERM_SESSION_BY_ACTOR.write().unwrap();
if let Some(some_session) = sessions.get(&actor_id) {
some_session.read().unwrap().tx.0.send(Msg::Shutdown).unwrap();
log::info!("Closed pty.");
some_session
.read()
.unwrap()
.tx
.0
.send(Msg::Shutdown)
.unwrap();
log::info!("Closed pty.");
}
sessions.remove(&actor_id);
@ -117,13 +119,9 @@ pub fn msg_handler(
if term_session_already_registered_in_hashmap(&actor_id) {
let mut term_session = TERM_SESSION_BY_ACTOR.write().unwrap();
if let Some(term_session) = term_session.get_mut(&actor_id) {
match msg {
TermUpMsg::RequestFullTermState => {
send_terminal_update_if_changed(
&actor_id,
term_session
);
send_terminal_update_if_changed(&actor_id, term_session);
}
TermUpMsg::SendCharacter(c) => {
{
@ -132,33 +130,24 @@ pub fn msg_handler(
let mut term = term_session.term.lock();
term.scroll_display(alacritty_terminal::grid::Scroll::Bottom);
}
send_terminal_update_if_changed(
&actor_id,
term_session
);
send_terminal_update_if_changed(&actor_id, term_session);
}
_ => {}
}
}
}
else if get_session_count() >= max_terminals {
} else if get_session_count() >= MAX_TERMINALS {
backend_term_start_error(
actor_instance,
ctx,
format!("Maximum number of {} open terminal sessions reached. Somebody must close at least one!", max_terminals).to_string(),
format!("Maximum number of {} open terminal sessions reached. Somebody must close at least one!", MAX_TERMINALS).to_string(),
);
}
else {
} else {
let (rows, cols) = (24, 80);
let id = get_session_count() as u64;
let pty_config = tty::Options {
shell: Some(tty::Shell::new(
"/usr/bin/env".to_string(),
vec!["bash".to_string()],
)),
shell: Some(tty::Shell::new("bash".to_string(), vec![])),
..tty::Options::default()
};
let config = term::Config::default();
@ -177,10 +166,10 @@ pub fn msg_handler(
let (event_sender, event_receiver) = std::sync::mpsc::channel();
let event_proxy = EventProxy {
channel: event_sender,
};
};
let term = Terminal::new::<terminal_size::TerminalSize>(
config,
&terminal_size.into(),
&terminal_size,
event_proxy.clone(),
);
let term = Arc::new(FairMutex::new(term));
@ -205,28 +194,26 @@ pub fn msg_handler(
let addr_thread_clone = ctx.address().clone();
ctx.spawn(actix::fut::wrap_future(async move {
// Start a new thread
thread::spawn(move || {
loop {
if let Ok(event) = event_receiver.recv() {
let mut sessions = TERM_SESSION_BY_ACTOR.write().unwrap();
match event {
Event::Exit => {
sessions.remove(&actor_id_thread_clone);
break;
}
_ => {
if let Some(term_session) = sessions.get_mut(&actor_id_thread_clone) {
send_terminal_update_if_changed(
&addr_thread_clone,
term_session
);
}
}
thread::spawn(move || loop {
if let Ok(event) = event_receiver.recv() {
let mut sessions = TERM_SESSION_BY_ACTOR.write().unwrap();
match event {
Event::Exit => {
sessions.remove(&actor_id_thread_clone);
break;
}
};
}
_ => {
if let Some(term_session) =
sessions.get_mut(&actor_id_thread_clone)
{
send_terminal_update_if_changed(
&addr_thread_clone,
term_session,
);
}
}
}
};
});
}));
@ -235,8 +222,8 @@ pub fn msg_handler(
old_content: String::new(),
old_cursor_pos: (0, 0),
tx: notifier,
cols: cols,
rows: rows,
cols,
rows,
};
TERM_SESSION_BY_ACTOR
.write()
@ -262,16 +249,18 @@ fn get_session_count() -> usize {
}
fn term_session_already_registered_in_hashmap(actor_id: &Addr<BackendType>) -> bool {
let sessions_map = TERM_SESSION_BY_ACTOR.read().unwrap();
sessions_map.contains_key(&actor_id)
sessions_map.contains_key(actor_id)
}
fn full_term_state(terminal_session: &TerminalSession) -> (String, alacritty_terminal::index::Point) {
fn full_term_state(
terminal_session: &TerminalSession,
) -> (String, alacritty_terminal::index::Point) {
let (rows, cols) = (terminal_session.rows, terminal_session.cols);
let term = terminal_session.term.lock();
let grid = term.grid().clone();
let cursor = grid.cursor.point.clone();
let cursor = grid.cursor.point;
return (term_grid_to_string(&grid, rows, cols), cursor);
(term_grid_to_string(&grid, rows, cols), cursor)
}
fn term_grid_to_string(grid: &Grid<Cell>, rows: u16, cols: u16) -> String {
@ -279,13 +268,13 @@ fn term_grid_to_string(grid: &Grid<Cell>, rows: u16, cols: u16) -> String {
// Populate string from grid
for indexed in grid.display_iter() {
let x = indexed.point.column.0 as usize;
let x = indexed.point.column.0;
let y = indexed.point.line.0 as usize;
if y < rows as usize && x < cols as usize {
term_content.push(indexed.c);
}
}
return term_content;
term_content
}
fn split_term_content_by_line(term_content: &str, cols: u16) -> Vec<Line> {
@ -293,49 +282,46 @@ fn split_term_content_by_line(term_content: &str, cols: u16) -> Vec<Line> {
let term_content_chars: Vec<char> = term_content.chars().collect();
for (index, chunk) in term_content_chars.chunks(cols as usize).enumerate() {
let content = chunk.iter().collect::<String>();
let line = Line { line: index as i32, content: content };
let line = Line {
line: index as i32,
content,
};
term_content_by_line.push(line);
}
return term_content_by_line;
term_content_by_line
}
fn send_terminal_update_if_changed(
actor_instance: &Addr<BackendType>,
term_session: &mut Arc<RwLock<TerminalSession>>
term_session: &mut Arc<RwLock<TerminalSession>>,
) {
let mut term_session = term_session.write().unwrap();
let (new_content, new_cursor) = full_term_state(&*term_session);
let new_term_content_by_line =
split_term_content_by_line(&new_content, term_session.cols);
let (new_content, new_cursor) = full_term_state(&term_session);
let new_term_content_by_line = split_term_content_by_line(&new_content, term_session.cols);
let term_content_len_has_changed = term_session.old_content.len() != new_content.len();
let damaged_lines =
if term_content_len_has_changed {
new_term_content_by_line
} else {
let old_term_content_by_line =
split_term_content_by_line(
&term_session.old_content,
term_session.cols);
new_term_content_by_line
.iter()
.zip(old_term_content_by_line.iter())
.filter(|(a, b)| a != b)
.map(|(a, b)| (a.clone())) // Extract values from references
.collect()
};
let down_msg = crate::DownMsg::TermDownMsg(TermDownMsg::TermUpdate(TerminalScreen {
rows: term_session.rows as usize,
cols: term_session.cols as usize,
damaged_lines: damaged_lines,
cursor_loc: Cursor {
row: new_cursor.line.0,
col: new_cursor.column.0,
}
}));
actor_instance.do_send(down_msg);
term_session.old_content = new_content;
let damaged_lines = if term_content_len_has_changed {
new_term_content_by_line
} else {
let old_term_content_by_line =
split_term_content_by_line(&term_session.old_content, term_session.cols);
new_term_content_by_line
.iter()
.zip(old_term_content_by_line.iter())
.filter(|(a, b)| a != b)
.map(|(a, b)| (a.clone())) // Extract values from references
.collect()
};
let down_msg = crate::DownMsg::TermDownMsg(TermDownMsg::TermUpdate(TerminalScreen {
rows: term_session.rows as usize,
cols: term_session.cols as usize,
damaged_lines,
cursor_loc: Cursor {
row: new_cursor.line.0,
col: new_cursor.column.0,
},
}));
actor_instance.do_send(down_msg);
term_session.old_content = new_content;
}

0
backend/types.elm
View file

2
flake.nix
View file

@ -93,7 +93,7 @@
runHook preInstall
mkdir -p $out
cp -r ./public $out/
cp ./backend/target/debug/backend $out/
cp ./backend/target/release/backend $out/
runHook postInstall
'';
}

10
frontend/Makefile
View file

@ -2,7 +2,7 @@ SRC_FILES := $(shell find src -name "*.elm")
all: elm.min.js
.PHONY: elm.min.js serve
.PHONY: elm.min.js watch
ifeq ($(DEBUG)$(RELEASE),) # Both are empty
$(error You must set exactly one of DEBUG=1 or RELEASE=1)
@ -19,12 +19,8 @@ else ifeq ($(RELEASE),1)
./build.sh --optimize src/Main.elm
endif
serve:
ifeq ($(DEBUG),1)
elm-go src/Main.elm --port=8000 --dir=../public --start-page=index.html -- --output=../public/elm.min.js
else ifeq ($(RELEASE),1)
$(error Cannot use serve target with RELEASE=1)
endif
watch:
elm-go src/Main.elm --no-server --dir=../public -- --output=../public/elm.min.js
clean:
rm elm.js elm.min.js

15
frontend/src/Page/Term.elm
View file

@ -68,15 +68,13 @@ keyDecoder =
toKey : String -> String -> Key
toKey key code =
if key == "Tab" then
Invalid
else
case String.uncons key of
Just (char, "") ->
Character code char
case key of
"Tab" -> Control code "Tab"
_ ->
case String.uncons key of
Just (char, "") -> Character code char
_ -> Control code key
_ ->
Control code key
isLowercaseAlpha : Char -> Bool
isLowercaseAlpha c =
@ -121,6 +119,7 @@ keyToString keyList =
else
Just <| String.fromChar c
(Control _ "Enter") :: _ -> Just "\r"
(Control _ "Tab") :: _ -> Just "\t"
(Control _ "Escape") :: _ -> Just "\u{001B}"
(Control _ "Backspace") :: _ -> Just "\u{0008}"
(Control _ "ArrowUp") :: _ -> Just "\u{001B}[A"