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
use std::{net::SocketAddr, sync::Arc, time::SystemTime};
use tokio::{
io::{AsyncWriteExt, ReadHalf},
net::{TcpListener, TcpStream},
sync::{
RwLock, Semaphore,
mpsc::{self},
},
};
use tracing::{info, warn};
use crate::app::{
ClientsStructType, LynnRouter, ReactorEventSender,
common_api::push_read_half,
tcp_reactor::{NewSocketEventSender, event::ReactorEvent, TcpSocketConfig},
connection_limiter::ConnectionLimiter,
};
pub(super) struct CoreReactor {
pub(super) tx: NewSocketEventSender,
}
impl CoreReactor {
pub(crate) fn new() -> Self {
let (tx, mut rx) = mpsc::channel::<(
ReadHalf<TcpStream>,
Arc<Semaphore>,
SocketAddr,
ClientsStructType,
u16,
u16,
Arc<LynnRouter>,
ReactorEventSender,
Arc<RwLock<SystemTime>>,
)>(64);
tokio::spawn(async move {
while let Some(a) = rx.recv().await {
push_read_half(a.0, a.1, a.2, a.3, a.4, a.5, a.6, a.7, a.8).await;
}
});
Self { tx }
}
pub(crate) async fn run(
&self,
tcp_listener: TcpListener,
clients: ClientsStructType,
alow_max_connections: Option<&usize>,
global_queue: ReactorEventSender,
connection_limiter: Option<(
&u64, // rate_limit
&usize, // max_connections_per_ip
Arc<ConnectionLimiter>,
)>,
tcp_config: TcpSocketConfig,
) {
loop {
// Waiting for a new link
let clinet_result = tcp_listener.accept().await;
if let Ok((socket, addr)) = clinet_result {
let mut socket_permit = true;
let mut socket = Some(socket);
// Apply TCP socket configuration
if let Some(ref s) = socket {
if let Err(e) = s.set_nodelay(tcp_config.nodelay) {
warn!(
"Failed to set TCP_NODELAY for {}: {}, using default",
addr, e
);
}
}
// Apply TCP keep-alive and buffer sizes using socket2
if tcp_config.keepalive_enabled || tcp_config.recv_buffer_size > 0 || tcp_config.send_buffer_size > 0 {
if let Some(s) = socket.take() {
// Convert TcpStream to std::net::TcpStream to access socket2
match s.into_std() {
Ok(std_socket) => {
use socket2::Socket;
let socket2 = Socket::from(std_socket);
// Apply TCP keep-alive if enabled
if tcp_config.keepalive_enabled {
use socket2::TcpKeepalive;
let ka = TcpKeepalive::new()
.with_time(std::time::Duration::from_secs(tcp_config.keepalive_time_secs));
if let Err(e) = socket2.set_tcp_keepalive(&ka) {
warn!(
"Failed to set keep-alive for {}: {}, using default",
addr, e
);
}
}
// Set buffer sizes if specified (non-zero)
if tcp_config.recv_buffer_size > 0 {
if let Err(e) = socket2.set_recv_buffer_size(tcp_config.recv_buffer_size) {
warn!(
"Failed to set recv buffer size for {}: {}, using default",
addr, e
);
}
}
if tcp_config.send_buffer_size > 0 {
if let Err(e) = socket2.set_send_buffer_size(tcp_config.send_buffer_size) {
warn!(
"Failed to set send buffer size for {}: {}, using default",
addr, e
);
}
}
// Convert back to TcpStream
let std_socket: std::net::TcpStream = socket2.into();
match TcpStream::from_std(std_socket) {
Ok(new_s) => { socket = Some(new_s); }
Err(e) => {
warn!("Failed to convert back to TcpStream for {}: {}, closing connection", addr, e);
socket_permit = false;
}
}
}
Err(e) => {
warn!("Failed to convert TcpStream for {}: {}, using default settings", addr, e);
// Note: We lost the socket here, but this is a very rare error case
// In practice, this conversion should never fail
socket_permit = false;
}
}
}
}
// Check global max connections
if let Some(max_connections) = alow_max_connections {
if clients.len() >= *max_connections {
socket_permit = false;
warn!(
"Server socket's count is more than MAX_CONNECTIONS, can not accept new client:{}",
addr
);
}
}
// Check connection limiter (rate limit and per-IP limit)
if socket_permit {
if let Some((_, _, limiter)) = &connection_limiter {
let ip = addr.ip();
if !limiter.check_connection(ip).await {
socket_permit = false;
warn!(
"Connection from {} rejected by connection limiter (rate limit or per-IP limit exceeded)",
addr
);
}
}
}
if socket_permit {
if let Some(s) = socket {
info!("Accepted connection from: {}", addr);
global_queue.push(ReactorEvent::crate_new_socket_event(s, addr));
}
} else {
if let Some(mut s) = socket {
let _ = s.shutdown().await;
}
}
} else {
if let Err(e) = clinet_result {
warn!(
"Failed to accept connection, server run next, e :{}",
e.to_string()
);
}
}
}
}
}