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use std::io::{self, BufReader, Cursor};
use std::net::ToSocketAddrs;
#[cfg(unix)]
use std::path::{Path, PathBuf};
use std::sync::Arc;
use super::frame::{Frame, RspBuf};
use super::queued_writer::QueuedWriter;
use crate::Server;
use bytes::BytesMut;
use co_managed::Manager;
use may::net::{TcpListener, UdpSocket};
#[cfg(unix)]
use may::os::unix::net::UnixListener;
use may::sync::Mutex;
use may::{coroutine, go};
macro_rules! t {
($e: expr) => {
match $e {
Ok(val) => val,
Err(err) => {
error!("call = {:?}\nerr = {:?}", stringify!($e), err);
continue;
}
}
};
}
/// service instance
pub struct ServerInstance(Option<coroutine::JoinHandle<()>>);
impl ServerInstance {
/// join the service, this would wait until the service is stopped
pub fn join(mut self) -> std::thread::Result<()> {
if let Some(handle) = self.0.take() {
handle.join()
} else {
Ok(())
}
}
}
impl Drop for ServerInstance {
fn drop(&mut self) {
if let Some(s) = self.0.take() {
unsafe { s.coroutine().cancel() };
s.join().ok();
}
}
}
/// Provides a function for starting the service.
pub trait UdpServer: Server {
/// Spawns the service, binding to the given address
/// return a coroutine that you can cancel it when need to stop the service
fn start<L: ToSocketAddrs>(self, addr: L) -> io::Result<ServerInstance> {
let sock = UdpSocket::bind(addr)?; // the write half
let sock1 = sock.try_clone()?; // the read half
let instance = go!(
coroutine::Builder::new().name("UdpServer".to_owned()),
move || {
let server = Arc::new(self);
let mut buf = vec![0u8; 1024];
// the write half need to be protected by mutex
// for that coroutine io obj can't shared safely
let sock = Arc::new(Mutex::new(sock));
let mut body_buf = BytesMut::with_capacity(1024 * 32);
loop {
// each udp packet should be less than 1024 bytes
let (len, addr) = t!(sock1.recv_from(&mut buf));
info!("recv_from: len={:?} addr={:?}", len, addr);
// if we failed to deserialize the request frame, just continue
let req = t!(Frame::decode_from(&mut Cursor::new(&buf), &mut body_buf));
let sock = sock.clone();
let server = server.clone();
// let mutex = mutex.clone();
go!(move || {
let mut rsp = RspBuf::new();
let ret = server.service(req.decode_req(), &mut rsp);
let data = rsp.finish(req.id, ret);
info!("send_to: len={:?} addr={:?}", data.len(), addr);
// send the result back to client
// udp no need to protect by a mutex, each send would be one frame
let s = sock.lock().unwrap();
match s.send_to(&data, addr) {
Ok(_) => {}
Err(err) => error!("udp send_to failed, err={:?}", err),
}
});
}
}
)?;
Ok(ServerInstance(Some(instance)))
}
}
/// Provides a function for starting the tcp service.
pub trait TcpServer: Server {
/// Spawns the service, binding to the given address
/// return a coroutine that you can cancel it when need to stop the service
fn start<L: ToSocketAddrs>(self, addr: L) -> io::Result<ServerInstance> {
let listener = TcpListener::bind(addr)?;
let instance = go!(
coroutine::Builder::new().name("TcpServer".to_owned()),
move || {
let server = Arc::new(self);
let manager = Manager::new();
for stream in listener.incoming() {
let stream = t!(stream);
stream.set_nodelay(true).unwrap();
let server = server.clone();
manager.add(move || {
let rs = stream.try_clone().expect("failed to clone stream");
// the read half of the stream
let mut rs = BufReader::new(rs);
// the write half of the stream
let ws = Arc::new(QueuedWriter::new(stream));
let mut buf = BytesMut::with_capacity(1024 * 32);
loop {
let req = match Frame::decode_from(&mut rs, &mut buf) {
Ok(r) => r,
Err(ref e) => {
if e.kind() == io::ErrorKind::UnexpectedEof {
info!("tcp server decode req: connection closed");
} else {
error!("tcp server decode req: err = {:?}", e);
}
break;
}
};
info!("get request: id={:?}", req.id);
let w_stream = ws.clone();
let server = server.clone();
go!(move || {
let mut rsp = RspBuf::new();
let ret = server.service(req.decode_req(), &mut rsp);
let data = rsp.finish(req.id, ret);
info!("send rsp: id={}", req.id);
// send the result back to client
w_stream.write(data).expect("tcp write to client failed");
});
}
});
}
}
)?;
Ok(ServerInstance(Some(instance)))
}
}
/// Provides a function for starting the unix domain socket service.
#[cfg(unix)]
pub trait UdsServer: Server {
/// Spawns the service, binding to the given address
/// return a coroutine that you can cancel it when need to stop the service
fn start<P: AsRef<Path>>(self, path: P) -> io::Result<ServerInstance> {
struct AutoDrop(UnixListener, PathBuf);
impl Drop for AutoDrop {
fn drop(&mut self) {
std::fs::remove_file(&self.1).ok();
}
}
std::fs::remove_file(&path).ok();
let listener = AutoDrop(UnixListener::bind(&path)?, path.as_ref().to_owned());
let instance = go!(
coroutine::Builder::new().name("Unix Socket Server".to_owned()),
move || {
let server = Arc::new(self);
let manager = Manager::new();
for stream in listener.0.incoming() {
let stream = t!(stream);
let server = server.clone();
manager.add(move || {
let rs = stream.try_clone().expect("failed to clone stream");
// the read half of the stream
let mut rs = BufReader::new(rs);
// the write half need to be protected by mutex
// for that coroutine io obj can't shared safely
let ws = Arc::new(QueuedWriter::new(stream));
let mut buf = BytesMut::with_capacity(1024 * 32);
loop {
let req = match Frame::decode_from(&mut rs, &mut buf) {
Ok(r) => r,
Err(ref e) => {
if e.kind() == io::ErrorKind::UnexpectedEof {
info!("uds server decode req: connection closed");
} else {
error!("uds server decode req: err = {:?}", e);
}
break;
}
};
info!("get request: id={:?}", req.id);
let w_stream = ws.clone();
let server = server.clone();
go!(move || {
let mut rsp = RspBuf::new();
let ret = server.service(req.decode_req(), &mut rsp);
let data = rsp.finish(req.id, ret);
info!("send rsp: id={}", req.id);
// send the result back to client
w_stream.write(data).expect("uds write to client failed");
});
}
});
}
}
)?;
Ok(ServerInstance(Some(instance)))
}
}
impl<T: Server> UdpServer for T {}
impl<T: Server> TcpServer for T {}
#[cfg(unix)]
impl<T: Server> UdsServer for T {}