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
|
package server
import (
"log"
"net"
"go.rctt.net/solec/core"
)
type RemoteServer struct {
Name string
Conn net.Conn
}
func NewRemoteServer(name string, conn net.Conn) RemoteServer {
return RemoteServer{name, conn}
}
func (s *Server) handleServerConn(conn net.Conn) {
defer conn.Close()
name, err := s.performServerAuth(conn)
if err != nil {
log.Println("server auth error:", err)
return
}
s.serversMu.RLock()
if _, ok := s.servers[name]; ok {
log.Println("server already connected")
return
}
s.serversMu.RUnlock()
rs := NewRemoteServer(name, conn)
s.serversMu.Lock()
s.servers[name] = rs
s.serversMu.Unlock()
log.Println("connection from server:", name)
defer func() {
s.serversMu.Lock()
log.Println("server disconnected: ", rs.Name)
delete(s.servers, rs.Name)
s.serversMu.Unlock()
}()
if err := s.readRemoteInput(conn); err != nil {
log.Println(err)
}
}
func (s *Server) performServerAuth(conn net.Conn) (string, error) {
payload, err := core.Decode(conn)
if err != nil {
return "", err
}
auth, ok := payload.(core.ServerAuth)
if !ok {
return "", core.ErrUnexpectedPayloadType
}
if err := core.Send(conn, core.Success{}); err != nil {
return "", err
}
return auth.Name, nil
}
func (s *Server) getRemote(name string) (RemoteServer, error) {
s.serversMu.RLock()
remote, ok := s.servers[name]
s.serversMu.RUnlock()
if ok {
return remote, nil
}
conn, err := s.initRemoteConn(name)
if err != nil {
return RemoteServer{}, err
}
rs := NewRemoteServer(name, conn)
s.serversMu.Lock()
s.servers[name] = rs
s.serversMu.Unlock()
log.Println("connected to server:", name)
return rs, nil
}
func (s *Server) initRemoteConn(name string) (net.Conn, error) {
conn, err := net.Dial("tcp", name+":9999")
if err != nil {
return conn, err
}
hs := core.Handshake{0, 1, core.ConnTypeServer}
if err := core.Send(conn, hs); err != nil {
conn.Close()
return conn, err
}
auth := core.ServerAuth{Name: s.cfg.Name}
if err := core.Send(conn, auth); err != nil {
conn.Close()
return conn, err
}
return conn, nil
}
func (s *Server) readRemoteInput(conn net.Conn) error {
for {
payload, err := core.Decode(conn)
if err != nil {
return err
}
if err := s.handleRemotePayload(conn, payload); err != nil {
log.Print("handler error: ", err)
}
}
}
func (s *Server) handleRemotePayload(sender net.Conn, payload any) error {
switch v := payload.(type) {
case core.Message:
return s.handleMessage(sender, core.ConnTypeServer, nil, v)
default:
return core.ErrUnexpectedPayloadType
}
}
|
