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|
//! Background network worker for the desktop frontend.
//!
//! The core is I/O-free, so the adapter owns the TLS stream. One blocking
//! thread keeps the connection, forwards every server line, and wakes the UI
//! through `egui::Context::request_repaint`. There is no async runtime: the
//! protocol has one request in flight plus server pushes.
use std::path::PathBuf;
use std::sync::mpsc::{self, Receiver, RecvTimeoutError, Sender};
use std::thread;
use std::time::Duration;
use eframe::egui;
use rusqlite::Connection;
use zagan_bet::client::transport::{self, TlsStream, TransportError, TrustPrompt};
use zagan_bet::client::{database, paths};
/// How often the worker checks the socket for pushes when idle.
const POLL: Duration = Duration::from_millis(8);
/// How long a first-contact prompt may stay unanswered.
const TRUST_TIMEOUT: Duration = Duration::from_secs(120);
/// What the UI asks the worker to do.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Command {
Connect { addr: String },
Send(String),
Disconnect,
Stop,
}
/// Why a connection attempt failed. The UI picks a screen from this.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Failure {
TrustDeclined,
KeyChanged { expected: String, observed: String },
VersionMismatch,
Timeout,
Other,
}
/// A connection that survived trust, version and auto-login.
#[derive(Debug, Clone, PartialEq)]
pub struct Connected {
pub addr: String,
pub user: Option<String>,
pub auth_error: Option<String>,
pub fingerprint: Option<String>,
pub latest: String,
pub url: String,
pub elapsed_ms: f32,
}
/// What the worker tells the UI.
pub enum Event {
/// First contact: the UI must answer through the sender.
Trust {
addr: String,
fingerprint: String,
reply: Sender<bool>,
},
Connected(Connected),
Failed {
addr: String,
failure: Failure,
message: String,
},
Line(String),
Closed,
}
fn classify(error: &TransportError) -> Failure {
match error {
TransportError::TrustDeclined => Failure::TrustDeclined,
TransportError::KeyChanged { expected, observed } => Failure::KeyChanged {
expected: expected.clone(),
observed: observed.clone(),
},
TransportError::VersionMismatch(_) => Failure::VersionMismatch,
TransportError::Timeout => Failure::Timeout,
_ => Failure::Other,
}
}
/// Handle held by the app. Dropping it stops the worker.
pub struct Network {
commands: Sender<Command>,
events: Receiver<Event>,
}
impl Network {
pub fn spawn(ctx: egui::Context, data_dir: PathBuf, unsafe_mode: bool) -> Self {
let (commands, command_rx) = mpsc::channel();
let (event_tx, events) = mpsc::channel();
thread::spawn(move || worker(ctx, data_dir, unsafe_mode, command_rx, event_tx));
Self { commands, events }
}
pub fn send(&self, command: Command) {
let _ = self.commands.send(command);
}
pub fn try_recv(&self) -> Option<Event> {
self.events.try_recv().ok()
}
}
impl Drop for Network {
fn drop(&mut self) {
let _ = self.commands.send(Command::Stop);
}
}
fn worker(
ctx: egui::Context,
data_dir: PathBuf,
unsafe_mode: bool,
commands: Receiver<Command>,
events: Sender<Event>,
) {
let db_path = paths::database_path(&data_dir);
let conn = match Connection::open(&db_path) {
Ok(conn) => {
let _ = conn.busy_timeout(Duration::from_secs(2));
database::init_db(&conn);
Some(conn)
}
Err(_) => None,
};
let mut stream: Option<TlsStream> = None;
loop {
match commands.recv_timeout(POLL) {
Ok(Command::Connect { addr }) => {
stream = None;
let Some(conn) = &conn else {
let _ = events.send(Event::Failed {
addr,
failure: Failure::Other,
message: format!("cannot open {}", db_path.display()),
});
ctx.request_repaint();
continue;
};
let mut trust = |prompt: &TrustPrompt| {
let (reply, decision) = mpsc::channel();
let _ = events.send(Event::Trust {
addr: prompt.addr.clone(),
fingerprint: prompt.fingerprint.clone(),
reply,
});
ctx.request_repaint();
decision.recv_timeout(TRUST_TIMEOUT).unwrap_or(false)
};
match transport::connect(&addr, conn, unsafe_mode, &mut trust) {
Ok(connected) => {
let fingerprint = database::get_fingerprint(conn, &addr);
let _ = events.send(Event::Connected(Connected {
addr: addr.clone(),
user: connected.user,
auth_error: connected.auth_error,
fingerprint,
latest: connected.latest,
url: connected.url,
elapsed_ms: connected.elapsed.as_secs_f64() as f32 * 1000.0,
}));
stream = Some(connected.stream);
}
Err(error) => {
let _ = events.send(Event::Failed {
addr,
failure: classify(&error),
message: error.to_string(),
});
}
}
ctx.request_repaint();
}
Ok(Command::Send(line)) => {
if let Some(open) = &mut stream {
if open.write_line(&line).is_err() {
stream = None;
let _ = events.send(Event::Closed);
}
}
ctx.request_repaint();
}
Ok(Command::Disconnect) => {
stream = None;
ctx.request_repaint();
}
Ok(Command::Stop) => break,
Err(RecvTimeoutError::Timeout) => {}
Err(RecvTimeoutError::Disconnected) => break,
}
// Drain pushes and replies without blocking the command channel.
if let Some(open) = &mut stream {
loop {
match open.read_available_line() {
Ok(Some(line)) => {
if events.send(Event::Line(line)).is_err() {
return;
}
}
Ok(None) => break,
Err(_) => {
stream = None;
let _ = events.send(Event::Closed);
break;
}
}
}
ctx.request_repaint();
}
}
}
|
