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extern crate tokio;
extern crate futures;
extern crate tokio_codec;
extern crate serde;
extern crate bincode;
extern crate bytes;
use tokio::net;
use tokio::prelude::*;
use bincode::{deserialize, serialize};
use tokio::io;
use tokio_codec::*;
use bytes::{BufMut, BytesMut};
use std::marker::PhantomData;
use std::sync::{Arc, Mutex};
use std::collections::HashMap;
use futures::sync::mpsc;
const DATA_SIZE: usize = 4;
#[derive(Debug)]
struct MessageCodec<T> {
name: String,
phantom: PhantomData<T>,
}
impl<T> MessageCodec<T> {
pub fn new(name: String) -> MessageCodec<T> {
MessageCodec { name: name, phantom: PhantomData }
}
}
pub fn number_to_four_vecu8(num: u64) -> Vec<u8> {
assert!(num < (1 << 32));
let mut result: Vec<u8> = vec![];
let mut x = num;
loop {
if x / 256 > 0 {
result.push((x % 256) as u8);
x = x / 256;
} else {
result.push((x % 256) as u8);
break;
}
}
for _ in 0..(DATA_SIZE - result.len()) {
result.push(0);
}
result.reverse();
return result;
}
pub fn four_vecu8_to_number(vec: Vec<u8>) -> u64 {
assert_eq!(vec.len(), DATA_SIZE);
let num = vec[0] as u64 * 256 * 256 * 256 + vec[1] as u64 * 256 * 256
+ vec[2] as u64 * 256 + vec[3] as u64;
return num;
}
impl<T> Encoder for MessageCodec<T> where T: serde::Serialize {
type Item = Option<T>;
type Error = io::Error;
fn encode(&mut self, item: Self::Item, dst: &mut BytesMut) -> Result<(), Self::Error> {
let mut data: Vec<u8> = vec![];
match item {
None => {
data.push(0 as u8);
let mut name = self.name.clone().into_bytes();
data.append(&mut name);
}
Some(v) => {
data.push(1 as u8);
data.append(&mut serialize(&v).unwrap());
}
}
let mut encoder: Vec<u8> = number_to_four_vecu8(data.len() as u64);
encoder.append(&mut data);
dst.reserve(encoder.len());
dst.put(encoder);
Ok(())
}
}
impl<T> Decoder for MessageCodec<T> where T: serde::de::DeserializeOwned {
type Item = (Option<String>, Option<T>);
type Error = io::Error;
fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
if src.len() < DATA_SIZE {
Ok(None)
} else {
let mut vec: Vec<u8> = src.to_vec();
let mut truth_data = vec.split_off(DATA_SIZE);
let vec_length = four_vecu8_to_number(vec);
if truth_data.len() == vec_length as usize {
let msg_data = truth_data.split_off(1);
src.clear();
match truth_data[0] {
0 => {
Ok(Some((Some(String::from_utf8(msg_data).unwrap()), None)))
}
1 => {
let msg: T = deserialize(&msg_data).unwrap();
Ok(Some((None, Some(msg))))
}
_ => {
panic!("unexpected message");
}
}
} else {
Ok(None)
}
}
}
}
fn start_server<T, F, U>(incoming: U, first_msg: T,
process_function: F,
server_name: String,
connections_outer: Arc<Mutex<HashMap<String, mpsc::Sender<Option<T>>>>>)
-> Box<Future<Item=(), Error=()> + Send + 'static>
where T: serde::de::DeserializeOwned + serde::Serialize + Send + 'static + Clone,
F: FnMut(String, T) -> Vec<(String, T)> + Send + Sync + 'static + Clone,
U: Stream + Send + Sync + 'static,
<U as futures::Stream>::Item: tokio::io::AsyncRead + tokio::io::AsyncWrite + Send + Sync,
<U as futures::Stream>::Error: std::fmt::Debug + 'static + Send + Sync
{
Box::new(
incoming
.for_each(move |stream| {
let process_function_outer = process_function.clone();
let server_name = server_name.clone();
let first_msg_inner = first_msg.clone();
let connections = connections_outer.clone();
let (tx, rx): (mpsc::Sender<Option<T>>, mpsc::Receiver<Option<T>>) = mpsc::channel(0);
let rx: Box<Stream<Item=Option<T>, Error=io::Error> + Send> = Box::new(rx.map_err(|_| panic!()));
let (sink, stream) = MessageCodec::new(server_name).framed(stream).split();
let send_to_client = rx.forward(sink).then(|result| {
if let Err(e) = result {
panic!("failed to write to socket: {}", e)
}
Ok(())
});
tokio::spawn(send_to_client);
let mut client_name = String::new();
let receive_and_process = stream.for_each(move |(name, msg): (Option<String>, Option<T>)| {
let connections_inner = connections.clone();
match name {
Some(register_name) => {
client_name = register_name.clone();
let mut tx_inner = tx.clone();
tx_inner.try_send(Some(first_msg_inner.clone())).unwrap();
connections_inner.lock().unwrap().insert(register_name, tx_inner);
}
None => {
let msg = msg.unwrap();
let mut process_function_inner = process_function_outer.clone();
let dest_and_msg = process_function_inner(client_name.clone(), msg);
for (dest, msg) in dest_and_msg {
if dest == "" {
let mut tx_inner = tx.clone();
tx_inner.try_send(Some(msg)).unwrap();
} else {
if connections_inner.lock().unwrap().contains_key(&dest) {
connections_inner.lock().unwrap().get_mut(&dest).unwrap()
.try_send(Some(msg)).unwrap();
} else {
println!("{} doesn't register", dest);
}
}
}
}
}
Ok(())
}).map_err(move |_| {
println!("closed connection");
});
tokio::spawn(receive_and_process);
Ok(())
}).map_err(|e| { println!("{:?}", e); })
)
}
fn start_client<T, F, U>(connect: U,
client_name: String,
mut process_function: F)
-> Box<Future<Item=(), Error=()> + Send + 'static>
where T: serde::de::DeserializeOwned + serde::Serialize + Send + 'static + Clone,
F: FnMut(T) -> Vec<T> + Send + Sync + 'static,
U: Future + Send + Sync + 'static,
<U as futures::Future>::Item: tokio::io::AsyncRead + tokio::io::AsyncWrite + Send + Sync,
<U as futures::Future>::Error: std::fmt::Debug + 'static + Send + Sync
{
let (mut tx, rx): (mpsc::Sender<Option<T>>, mpsc::Receiver<Option<T>>) = mpsc::channel(0);
let rx: Box<Stream<Item=Option<T>, Error=io::Error> + Send> = Box::new(rx.map_err(|_| panic!()));
Box::new(
connect.and_then(move |mut tcp_stream| {
let mut message_codec: MessageCodec<T> = MessageCodec::new(client_name);
let register_msg = None;
let mut buf = BytesMut::new();
let _ = message_codec.encode(register_msg, &mut buf);
let _ = tcp_stream.write_all(&buf);
let (sink, stream) = message_codec.framed(tcp_stream).split();
let send_to_server = rx.forward(sink).then(|result| {
if let Err(e) = result {
panic!("failed to write to socket: {}", e)
}
Ok(())
});
tokio::spawn(send_to_server);
let receive_and_process = stream.for_each(move |(name, msg): (Option<String>, Option<T>)| {
match name {
Some(_) => {
panic!("client received unexpected message");
}
None => {
let msg = msg.unwrap();
let msgs = process_function(msg);
for msg in msgs {
tx.try_send(Some(msg)).unwrap();
}
}
}
Ok(())
}).map_err(move |_| { println!("server closed"); });
tokio::spawn(receive_and_process);
Ok(())
}).map_err(|e| { println!("{:?}", e); })
)
}
#[allow(dead_code)]
pub mod tcp;
#[allow(dead_code)]
pub mod uds;
pub fn create_tcp_server<T>(addr: &str, server_name: &str) -> tcp::TCPMsgServer<T>
where T: serde::de::DeserializeOwned + serde::Serialize + Send + 'static + Clone
{
tcp::TCPMsgServer::new(addr, server_name)
}
pub fn create_tcp_client<T>(addr: &str, client_name: &str) -> tcp::TCPMsgClient<T>
where T: serde::de::DeserializeOwned + serde::Serialize + Send + 'static + Clone
{
tcp::TCPMsgClient::new(addr, client_name)
}
pub fn create_uds_server<T>(addr: &str, server_name: &str) -> uds::UDSMsgServer<T>
where T: serde::de::DeserializeOwned + serde::Serialize + Send + 'static + Clone
{
uds::UDSMsgServer::new(addr, server_name)
}
pub fn create_uds_client<T>(addr: &str, client_name: &str) -> uds::UDSMsgClient<T>
where T: serde::de::DeserializeOwned + serde::Serialize + Send + 'static + Clone
{
uds::UDSMsgClient::new(addr, client_name)
}