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
|
package internal
import (
"context"
"net"
"strings"
"sync"
)
type logger interface {
Log(keyvals ...any) error
}
type Server struct {
Ctx context.Context
Cancel context.CancelFunc
Wg *sync.WaitGroup
Listener net.Listener
HandleConn connHandler
ErrorLog logger
Host string
NetworkAddr net.Addr
}
type connHandler func(net.Conn)
func NewServer(
ctx context.Context,
hostname string,
network string,
address string,
errorLog logger,
handleConn connHandler,
) (Server, error) {
listener, err := net.Listen(network, address)
if err != nil {
return Server{}, err
}
networkAddr := listener.Addr()
ctx, cancel := context.WithCancel(ctx)
return Server{
Ctx: ctx,
Cancel: cancel,
Wg: &sync.WaitGroup{},
Listener: listener,
HandleConn: handleConn,
ErrorLog: errorLog,
Host: hostname,
NetworkAddr: networkAddr,
}, nil
}
func (s *Server) Serve() error {
s.Wg.Add(1)
defer s.Wg.Done()
s.propagateClose()
for {
conn, err := s.Listener.Accept()
if err != nil {
if s.Closed() {
err = nil
} else {
_ = s.ErrorLog.Log("msg", "accept error", "error", err)
}
return err
}
s.Wg.Add(1)
go func() {
defer s.Wg.Done()
defer func() {
_ = conn.Close()
}()
s.HandleConn(conn)
}()
}
}
func (s *Server) Hostname() string {
host, _, _ := net.SplitHostPort(s.Host)
return host
}
func (s *Server) Port() string {
_, port, _ := net.SplitHostPort(s.Host)
return port
}
func (s *Server) Network() string {
return s.NetworkAddr.Network()
}
func (s *Server) Address() string {
return s.NetworkAddr.String()
}
func (s *Server) Close() {
s.Cancel()
s.Wg.Wait()
}
func (s *Server) LogError(keyvals ...any) error {
return s.ErrorLog.Log(keyvals...)
}
func (s *Server) Closed() bool {
select {
case <-s.Ctx.Done():
return true
default:
return false
}
}
func (s *Server) propagateClose() {
s.Wg.Add(1)
go func() {
defer s.Wg.Done()
<-s.Ctx.Done()
_ = s.Listener.Close()
}()
}
// JoinDefaultPort appends ":<port>" iff the address does not already contain a port.
func JoinDefaultPort(address string, port string) string {
if address[0] == '[' {
hend := strings.LastIndexByte(address, ']')
if len(address) > hend+1 && address[hend+1] == ':' {
return address
}
return net.JoinHostPort(address[1:hend], port)
}
if strings.Contains(address, ":") {
return address
}
return net.JoinHostPort(address, port)
}
|
