1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
use std::collections::HashMap;
use std::hash::Hash;
use std::marker::PhantomData;
use std::net::{SocketAddr, UdpSocket};
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::mpsc;
use std::sync::{Arc, Mutex};
use crate::context::Context;
use crate::transport::Result;
use crate::transport::connection::Connection;
use crate::transport::listener::Listener;
use crate::transport::receiver::PacketReceiver;
use crate::transport::sender::PacketSender;
use crate::transport::{Transport, TransportError};
// TODO : check Udp Transport
#[derive(Clone)]
pub struct UdpPeerSender {
sock: Arc<UdpSocket>,
peer: SocketAddr,
}
impl<Data> PacketSender<Data> for UdpPeerSender {
fn send<P: crate::codec::Codec<Data>>(&self, packet: P, ctx: &Context<Data>) -> Result<()> {
let mut buf = Vec::new();
packet.encode(&mut buf, ctx)?;
self.sock.send_to(&buf, self.peer)?;
Ok(())
}
}
enum UdpReceiverInner {
Channel(Mutex<mpsc::Receiver<Vec<u8>>>),
Socket(Arc<UdpSocket>),
}
pub struct UdpReceiver<Uid> {
uid: Uid,
inner: UdpReceiverInner,
}
impl<Uid> UdpReceiver<Uid> {
fn channel(rx: Mutex<mpsc::Receiver<Vec<u8>>>, uid: Uid) -> Self {
Self {
uid,
inner: UdpReceiverInner::Channel(rx),
}
}
fn socket(sock: Arc<UdpSocket>, uid: Uid) -> Self {
Self {
uid,
inner: UdpReceiverInner::Socket(sock),
}
}
}
impl<Data, Uid> PacketReceiver<Data, Uid> for UdpReceiver<Uid>
where
Uid: PartialEq + Clone + Send + Sync,
{
fn recv<P: crate::codec::Codec<Data>>(&self, ctx: &Context<Data>) -> Result<(Uid, P)> {
let bytes = match &self.inner {
UdpReceiverInner::Channel(rx) => rx
.lock()
.map_err(|_| TransportError::LockPoisoned)?
.recv()
.map_err(|_| TransportError::ChannelClosed)?,
UdpReceiverInner::Socket(sock) => {
let mut buf = vec![0u8; 65535];
let (n, _) = sock.recv_from(&mut buf)?;
buf.truncate(n);
buf
}
};
let mut reader = bytes.as_slice();
let packet = P::decode(&mut reader, ctx)?;
Ok((self.uid.clone(), packet))
}
}
pub struct UdpListener<Uid, Data> {
sock: Arc<UdpSocket>,
factory: Arc<dyn Fn() -> Uid + Send + Sync>,
addr_to_uid: HashMap<SocketAddr, Uid>,
uid_to_tx: HashMap<Uid, mpsc::Sender<Vec<u8>>>,
_p: PhantomData<Data>,
}
impl<Uid, Data> Listener<Uid> for UdpListener<Uid, Data>
where
Uid: PartialEq + Eq + Hash + Clone + Send + Sync,
Data: Send + Sync,
{
type Data = Data;
type Sender = UdpPeerSender;
type Receiver = UdpReceiver<Uid>;
fn accept(&mut self) -> Result<Connection<Uid, Data, UdpPeerSender, UdpReceiver<Uid>>> {
loop {
let mut buf = vec![0u8; 65535];
let (n, src) = self.sock.recv_from(&mut buf)?;
buf.truncate(n);
if let Some(uid) = self.addr_to_uid.get(&src).cloned() {
match self.uid_to_tx.get(&uid) {
Some(tx) => {
if tx.send(buf).is_err() {
self.uid_to_tx.remove(&uid);
self.addr_to_uid.remove(&src);
}
}
None => {
self.addr_to_uid.remove(&src);
}
}
continue;
}
let uid = (self.factory)();
let (tx, rx) = mpsc::channel();
self.addr_to_uid.insert(src, uid.clone());
self.uid_to_tx.insert(uid.clone(), tx);
if self.uid_to_tx.get(&uid).unwrap().send(buf).is_err() {
self.addr_to_uid.remove(&src);
self.uid_to_tx.remove(&uid);
continue;
}
let sender = UdpPeerSender {
sock: self.sock.clone(),
peer: src,
};
let receiver = UdpReceiver::channel(Mutex::new(rx), uid.clone());
return Ok(Connection::new(sender, receiver));
}
}
}
pub struct UdpTransport<Uid, Data> {
factory: Arc<dyn Fn() -> Uid + Send + Sync>,
_p: PhantomData<(Uid, Data)>,
}
impl<Uid, Data> UdpTransport<Uid, Data>
where
Uid: PartialEq + Eq + Hash + Clone + Send + Sync,
{
pub fn new<F: Fn() -> Uid + Send + Sync + 'static>(factory: F) -> Self {
Self {
factory: Arc::new(factory),
_p: PhantomData,
}
}
}
impl Default for UdpTransport<u64, ()> {
fn default() -> Self {
let counter = Arc::new(AtomicU64::new(0));
UdpTransport::new(move || counter.fetch_add(1, Ordering::Relaxed))
}
}
impl<Uid, Data> Transport<Uid> for UdpTransport<Uid, Data>
where
Uid: PartialEq + Eq + Hash + Clone + Send + Sync,
Data: Send + Sync,
{
type Data = Data;
type Addr = SocketAddr;
type Sender = UdpPeerSender;
type Receiver = UdpReceiver<Uid>;
type Listener = UdpListener<Uid, Data>;
fn connect(
&self,
addr: SocketAddr,
) -> Result<Connection<Uid, Data, UdpPeerSender, UdpReceiver<Uid>>> {
let sock = UdpSocket::bind("0.0.0.0:0")?;
let sock = Arc::new(sock);
let uid = (self.factory)();
let sender = UdpPeerSender {
sock: sock.clone(),
peer: addr,
};
let receiver = UdpReceiver::socket(sock, uid);
Ok(Connection::new(sender, receiver))
}
fn listen(&self, addr: SocketAddr) -> Result<UdpListener<Uid, Data>> {
let sock = UdpSocket::bind(addr)?;
Ok(UdpListener {
sock: Arc::new(sock),
factory: self.factory.clone(),
addr_to_uid: HashMap::new(),
uid_to_tx: HashMap::new(),
_p: PhantomData,
})
}
}
|
