Select Git revision
server.rs 11.76 KiB
use std;
use std::io::{Error, ErrorKind};
use std::thread;
use std::net::{ToSocketAddrs, SocketAddr};
use std::sync::mpsc;
use mio::{EventLoop, PollOpt, EventSet, Handler, Sender, Token};
use mio::udp::UdpSocket;
use message::packet::Packet;
use message::request::CoAPRequest;
use message::response::CoAPResponse;
use threadpool::ThreadPool;
const DEFAULT_WORKER_NUM: usize = 4;
type TxQueue = mpsc::Sender<QueuedResponse>;
type RxQueue = mpsc::Receiver<QueuedResponse>;
#[derive(Debug)]
pub enum CoAPServerError {
NetworkError,
EventLoopError,
AnotherHandlerIsRunning,
}
#[derive(Debug)]
struct QueuedResponse {
pub address: SocketAddr,
pub response: CoAPResponse,
}
#[derive(Debug)]
enum EventLoopNotify {
NewResponse,
Shutdown,
}
#[derive(Debug)]
enum ResponseError {
SocketUnwritable,
SocketError,
PacketInvalid,
}
pub trait CoAPHandler: Sync + Send + Copy {
fn handle(&self, CoAPRequest) -> Option<CoAPResponse>;
}
impl<F> CoAPHandler for F
where F: Fn(CoAPRequest) -> Option<CoAPResponse>,
F: Sync + Send + Copy
{
fn handle(&self, request: CoAPRequest) -> Option<CoAPResponse> {
return self(request);
}
}
struct UdpHandler<H: CoAPHandler + 'static> {
socket: UdpSocket,
tx_sender: TxQueue,
rx_recv: RxQueue,
worker_pool: ThreadPool,
coap_handler: H,
}
impl<H: CoAPHandler + 'static> UdpHandler<H> {
fn new(socket: UdpSocket,
tx_sender: TxQueue,
rx_recv: RxQueue,
worker_num: usize,
coap_handler: H)
-> UdpHandler<H> {
UdpHandler {
socket: socket,
tx_sender: tx_sender,
rx_recv: rx_recv,
worker_pool: ThreadPool::new(worker_num),
coap_handler: coap_handler,
}
}
fn request_handler(&self, event_loop: &mut EventLoop<UdpHandler<H>>) {
match self.requset_recv() {
Some(rqst) => {
let src = rqst.source.unwrap();
let coap_handler = self.coap_handler;
let response_q = self.tx_sender.clone();
let event_sender = event_loop.channel();
self.worker_pool.execute(move || {
match coap_handler.handle(rqst) {
Some(response) => {
debug!("Response: {:?}", response);
response_q.send(QueuedResponse {
address: src,
response: response,
}).unwrap();
match event_sender.send(EventLoopNotify::NewResponse) {
Ok(()) => {}
Err(error) => {
warn!("Notify NewResponse failed, {:?}", error);
}
}
}
None => {
debug!("No response");
}
}
});
}
None => {}
}
}
fn response_handler(&self) -> bool {
loop {
match self.rx_recv.try_recv() {
Ok(q_res) => {
match self.response_send(&q_res) {
Ok(()) => {}
Err(ResponseError::SocketUnwritable) => {
self.tx_sender.send(q_res).unwrap();
return false;
}
Err(_) => {}
}
}
Err(mpsc::TryRecvError::Empty) => {
return true;
}
Err(mpsc::TryRecvError::Disconnected) => {
panic!("The RxQueue become disconnected");
}
}
}
}
fn requset_recv(&self) -> Option<CoAPRequest> {
let mut buf = [0; 1500];
match self.socket.recv_from(&mut buf) {
Ok(Some((nread, src))) => {
debug!("Handling request from {}", src);
match Packet::from_bytes(&buf[..nread]) {
Ok(packet) => {
return Some(CoAPRequest::from_packet(packet, &src));
}
Err(_) => {
error!("Failed to parse request");
return None;
}
}
}
_ => {
error!("Failed to read from socket");
panic!("unexpected error");
}
}
}
fn response_send(&self, q_res: & QueuedResponse) -> Result<(), ResponseError> {
match q_res.response.message.to_bytes() {
Ok(bytes) => {
match self.socket.send_to(&bytes[..], &q_res.address) {
// Look at https://github.com/carllerche/mio/issues/411 in detail
Ok(None) => return Err(ResponseError::SocketUnwritable),
Ok(_) => Ok(()),
Err(error) => {
error!("Failed to send response, {:?}", error);
return Err(ResponseError::SocketError);
}
}
}
Err(error) => {
error!("Failed to decode response, {:?}", error);
return Err(ResponseError::PacketInvalid);
}
}
}
}
impl<H: CoAPHandler + 'static> Handler for UdpHandler<H> {
type Timeout = usize;
type Message = EventLoopNotify;
fn ready(&mut self, event_loop: &mut EventLoop<UdpHandler<H>>, _: Token, events: EventSet) {
if events.is_writable() {
// handle the response
match self.response_handler() {
true => {
event_loop.reregister(&self.socket, Token(0), EventSet::readable(), PollOpt::level()).unwrap();
}
false => {
event_loop.reregister(&self.socket, Token(0), EventSet::writable(), PollOpt::edge()).unwrap();
}
}
} else if events.is_readable() {
// handle the request
self.request_handler(event_loop);
} else {
warn!("Unknown Event, {:?}", events);
}
}
fn notify(&mut self, event_loop: &mut EventLoop<UdpHandler<H>>, msg: EventLoopNotify) {
match msg {
EventLoopNotify::NewResponse => {
event_loop.reregister(&self.socket, Token(0), EventSet::writable(), PollOpt::edge()).unwrap();
}
EventLoopNotify::Shutdown => {
info!("Shutting down request handler");
event_loop.shutdown();
}
}
}
}
pub struct CoAPServer {
socket: UdpSocket,
event_sender: Option<Sender<EventLoopNotify>>,
event_thread: Option<thread::JoinHandle<()>>,
worker_num: usize,
}
impl CoAPServer {
/// Creates a CoAP server listening on the given address.
pub fn new<A: ToSocketAddrs>(addr: A) -> std::io::Result<CoAPServer> {
addr.to_socket_addrs().and_then(|mut iter| {
match iter.next() {
Some(ad) => {
UdpSocket::bound(&ad).and_then(|s| {
Ok(CoAPServer {
socket: s,
event_sender: None,
event_thread: None,
worker_num: DEFAULT_WORKER_NUM,
})
})
}
None => Err(Error::new(ErrorKind::Other, "no address")),
}
})
}
/// Starts handling requests with the handler
pub fn handle<H: CoAPHandler + 'static>(&mut self, handler: H) -> Result<(), CoAPServerError> {
let socket;
// Early return error checking
if let Some(_) = self.event_sender {
error!("Handler already running!");
return Err(CoAPServerError::AnotherHandlerIsRunning);
}
match self.socket.try_clone() {
Ok(good_socket) => socket = good_socket,
Err(_) => {
error!("Network Error!");
return Err(CoAPServerError::NetworkError);
}
}
// Create resources
let (tx, rx) = mpsc::channel();
let (tx_send, tx_recv): (TxQueue, RxQueue) = mpsc::channel();
let worker_num = self.worker_num;
// Setup and spawn event loop thread, which will spawn
// children threads which handle incomining requests
let thread = thread::spawn(move || {
let mut event_loop = EventLoop::new().unwrap();
event_loop.register(&socket, Token(0), EventSet::readable(), PollOpt::level()).unwrap();
tx.send(event_loop.channel()).unwrap();
event_loop.run(&mut UdpHandler::new(socket, tx_send, tx_recv, worker_num, handler)).unwrap();
});
// Ensure threads started successfully
match rx.recv() {
Ok(event_sender) => {
self.event_sender = Some(event_sender);
self.event_thread = Some(thread);
Ok(())
}
Err(_) => Err(CoAPServerError::EventLoopError),
}
}
/// Stop the server.
pub fn stop(&mut self) {
let event_sender = self.event_sender.take();
match event_sender {
Some(ref sender) => {
sender.send(EventLoopNotify::Shutdown).unwrap();
self.event_thread.take().map(|g| g.join());
}
_ => {}
}
}
/// Set the number of threads for handling requests
pub fn set_worker_num(&mut self, worker_num: usize) {
self.worker_num = worker_num;
}
}
impl Drop for CoAPServer {
fn drop(&mut self) {
self.stop();
}
}
#[cfg(test)]
mod test {
use client::CoAPClient;
use message::header;
use message::IsMessage;
use message::packet::CoAPOption;
use message::request::CoAPRequest;
use message::response::CoAPResponse;
use super::*;
fn request_handler(req: CoAPRequest) -> Option<CoAPResponse> {
let uri_path_list = req.get_option(CoAPOption::UriPath).unwrap();
assert!(uri_path_list.len() == 1);
match req.response {
Some(mut response) => {
response.set_payload(uri_path_list.front().unwrap().clone());
Some(response)
}
_ => None,
}
}
#[test]
fn test_echo_server() {
let mut server = CoAPServer::new("127.0.0.1:5683").unwrap();
server.handle(request_handler).unwrap();
let client = CoAPClient::new("127.0.0.1:5683").unwrap();
let mut request = CoAPRequest::new();
request.set_version(1);
request.set_type(header::MessageType::Confirmable);
request.set_code("0.01");
request.set_message_id(1);
request.set_token(vec![0x51, 0x55, 0x77, 0xE8]);
request.add_option(CoAPOption::UriPath, b"test-echo".to_vec());
client.send(&request).unwrap();
let recv_packet = client.receive().unwrap();
assert_eq!(recv_packet.message.payload, b"test-echo".to_vec());
}
#[test]
fn test_echo_server_no_token() {
let mut server = CoAPServer::new("127.0.0.1:5685").unwrap();
server.handle(request_handler).unwrap();
let client = CoAPClient::new("127.0.0.1:5685").unwrap();
let mut packet = CoAPRequest::new();
packet.set_version(1);
packet.set_type(header::MessageType::Confirmable);
packet.set_code("0.01");
packet.set_message_id(1);
packet.add_option(CoAPOption::UriPath, b"test-echo".to_vec());
client.send(&packet).unwrap();
let recv_packet = client.receive().unwrap();
assert_eq!(recv_packet.message.payload, b"test-echo".to_vec());
}
}