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
|
use std::net::SocketAddr;
use std::sync::{Arc};
use bytes::Bytes;
use log::{debug, trace};
use tokio::net::TcpStream;
use tokio::sync::{mpsc, watch};
use tokio_util::compat::*;
use futures::io::AsyncReadExt;
use async_trait::async_trait;
use kuska_handshake::async_std::{handshake_server, BoxStream};
use crate::error::*;
use crate::netapp::*;
use crate::proto::*;
use crate::util::*;
// The client and server connection structs (client.rs and server.rs)
// build upon the chunking mechanism which is exclusively contained
// in proto.rs.
// Here, we just care about sending big messages without size limit.
// The format of these messages is described below.
// Chunking happens independently.
// Request message format (client -> server):
// - u8 priority
// - u8 path length
// - [u8; path length] path
// - [u8; *] data
// Response message format (server -> client):
// - u8 response code
// - [u8; *] response
pub(crate) struct ServerConn {
pub(crate) remote_addr: SocketAddr,
pub(crate) peer_id: NodeID,
netapp: Arc<NetApp>,
resp_send: mpsc::UnboundedSender<Option<(RequestID, RequestPriority, Vec<u8>)>>,
close_send: watch::Sender<bool>,
}
impl ServerConn {
pub(crate) async fn run(netapp: Arc<NetApp>, socket: TcpStream) -> Result<(), Error> {
let remote_addr = socket.peer_addr()?;
let mut socket = socket.compat();
let handshake = handshake_server(
&mut socket,
netapp.netid.clone(),
netapp.id,
netapp.privkey.clone(),
)
.await?;
let peer_id = handshake.peer_pk;
debug!(
"Handshake complete (server) with {}@{}",
hex::encode(&peer_id),
remote_addr
);
let (read, write) = socket.split();
let (read, write) =
BoxStream::from_handshake(read, write, handshake, 0x8000).split_read_write();
let (resp_send, resp_recv) = mpsc::unbounded_channel();
let (close_send, close_recv) = watch::channel(false);
let conn = Arc::new(ServerConn {
netapp: netapp.clone(),
remote_addr,
peer_id,
resp_send,
close_send,
});
netapp.connected_as_server(peer_id, conn.clone());
let conn2 = conn.clone();
let conn3 = conn.clone();
let close_recv2 = close_recv.clone();
tokio::try_join!(
async move {
tokio::select!(
r = conn2.recv_loop(read) => r,
_ = await_exit(close_recv) => Ok(()),
)
},
async move {
tokio::select!(
r = conn3.send_loop(resp_recv, write) => r,
_ = await_exit(close_recv2) => Ok(()),
)
},
)
.map(|_| ())
.log_err("ServerConn recv_loop/send_loop");
netapp.disconnected_as_server(&peer_id, conn);
Ok(())
}
pub fn close(&self) {
self.close_send.send(true).unwrap();
}
async fn recv_handler_aux(self: &Arc<Self>, bytes: &[u8]) -> Result<Vec<u8>, Error> {
if bytes.len() < 2 {
return Err(Error::Message("Invalid protocol message".into()));
}
// byte 0 is the request priority, we don't care here
let path_length = bytes[1] as usize;
if bytes.len() < 2 + path_length {
return Err(Error::Message("Invalid protocol message".into()));
}
let path = &bytes[2..2 + path_length];
let path = String::from_utf8(path.to_vec())?;
let data = &bytes[2 + path_length..];
let handler_opt = {
let endpoints = self.netapp.endpoints.read().unwrap();
endpoints.get(&path).map(|e| e.clone_endpoint())
};
if let Some(handler) = handler_opt {
handler.handle(data, self.peer_id).await
} else {
Err(Error::NoHandler)
}
}
}
impl SendLoop for ServerConn {}
#[async_trait]
impl RecvLoop for ServerConn {
async fn recv_handler(self: Arc<Self>, id: RequestID, bytes: Vec<u8>) {
trace!("ServerConn recv_handler {} ({} bytes)", id, bytes.len());
let bytes: Bytes = bytes.into();
let prio = if !bytes.is_empty() {
bytes[0]
} else {
0u8
};
let resp = self.recv_handler_aux(&bytes[..]).await;
let mut resp_bytes = vec![];
match resp {
Ok(rb) => {
resp_bytes.push(0u8);
resp_bytes.extend(&rb[..]);
}
Err(e) => {
resp_bytes.push(e.code());
}
}
trace!("ServerConn sending response to {}: ", id);
self.resp_send
.send(Some((id, prio, resp_bytes)))
.log_err("ServerConn recv_handler send resp");
}
}
|
