129 lines
3.2 KiB
Rust
129 lines
3.2 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! `WebSockets` server.
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use ws;
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use std;
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use std::thread;
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use std::ops::Drop;
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use std::sync::Arc;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use std::net::SocketAddr;
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use util::panics::{PanicHandler, OnPanicListener, MayPanic};
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/// Signer startup error
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#[derive(Debug)]
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pub enum ServerError {
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/// Wrapped `std::io::Error`
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IoError(std::io::Error),
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/// Other `ws-rs` error
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Other(ws::Error)
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}
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impl From<ws::Error> for ServerError {
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fn from(err: ws::Error) -> Self {
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match err.kind {
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ws::ErrorKind::Io(e) => ServerError::IoError(e),
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_ => ServerError::Other(err),
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}
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}
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}
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/// `WebSockets` server implementation.
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pub struct Server {
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handle: Option<thread::JoinHandle<ws::WebSocket<Factory>>>,
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broadcaster: ws::Sender,
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panic_handler: Arc<PanicHandler>,
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}
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impl Server {
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/// Starts a new `WebSocket` server in separate thread.
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/// Returns a `Server` handle which closes the server when droped.
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pub fn start(addr: SocketAddr) -> Result<Server, ServerError> {
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let config = {
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let mut config = ws::Settings::default();
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config.max_connections = 5;
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config.method_strict = true;
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config
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};
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// Create WebSocket
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let session_id = Arc::new(AtomicUsize::new(1));
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let ws = try!(ws::Builder::new().with_settings(config).build(Factory {
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session_id: session_id,
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}));
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let panic_handler = PanicHandler::new_in_arc();
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let ph = panic_handler.clone();
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let broadcaster = ws.broadcaster();
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// Spawn a thread with event loop
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let handle = thread::spawn(move || {
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ph.catch_panic(move || {
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ws.listen(addr).unwrap()
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}).unwrap()
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});
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// Return a handle
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Ok(Server {
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handle: Some(handle),
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broadcaster: broadcaster,
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panic_handler: panic_handler,
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})
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}
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}
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impl MayPanic for Server {
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fn on_panic<F>(&self, closure: F) where F: OnPanicListener {
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self.panic_handler.on_panic(closure);
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}
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}
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impl Drop for Server {
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fn drop(&mut self) {
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self.broadcaster.shutdown().expect("WsServer should close nicely.");
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self.handle.take().unwrap().join().unwrap();
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}
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}
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struct Session {
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id: usize,
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out: ws::Sender,
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}
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impl ws::Handler for Session {
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fn on_open(&mut self, _shake: ws::Handshake) -> ws::Result<()> {
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try!(self.out.send(format!("Hello client no: {}. We are not implemented yet.", self.id)));
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try!(self.out.close(ws::CloseCode::Normal));
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Ok(())
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}
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}
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struct Factory {
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session_id: Arc<AtomicUsize>,
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}
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impl ws::Factory for Factory {
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type Handler = Session;
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fn connection_made(&mut self, sender: ws::Sender) -> Self::Handler {
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Session {
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id: self.session_id.fetch_add(1, Ordering::SeqCst),
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out: sender,
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}
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}
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}
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