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
|
package gemini
import (
"context"
"crypto/tls"
"io"
"net"
"sync"
"tildegit.org/tjp/gus"
)
type server struct {
ctx context.Context
network string
address string
cancel context.CancelFunc
wg *sync.WaitGroup
listener net.Listener
handler gus.Handler
}
// NewServer builds a gemini server.
func NewServer(
ctx context.Context,
tlsConfig *tls.Config,
network string,
address string,
handler gus.Handler,
) (gus.Server, error) {
listener, err := net.Listen(network, address)
if err != nil {
return nil, err
}
addr := listener.Addr()
s := &server{
ctx: ctx,
network: addr.Network(),
address: addr.String(),
wg: &sync.WaitGroup{},
listener: tls.NewListener(listener, tlsConfig),
handler: handler,
}
return s, nil
}
// Serve starts the server and blocks until it is closed.
//
// This function will allocate resources which are not cleaned up until
// Close() is called.
//
// It will respect cancellation of the context the server was created with,
// but be aware that Close() must still be called in that case to avoid
// dangling goroutines.
func (s *server) Serve() error {
s.wg.Add(1)
defer s.wg.Done()
s.ctx, s.cancel = context.WithCancel(s.ctx)
s.wg.Add(1)
s.propagateCancel()
for {
conn, err := s.listener.Accept()
if err != nil {
if s.Closed() {
err = nil
}
return err
}
s.wg.Add(1)
go s.handleConn(conn)
}
}
func (s *server) Close() {
s.cancel()
s.wg.Wait()
}
func (s *server) Network() string {
return s.network
}
func (s *server) Address() string {
return s.address
}
func (s *server) Hostname() string {
host, _, _ := net.SplitHostPort(s.address)
return host
}
func (s *server) Port() string {
_, portStr, _ := net.SplitHostPort(s.address)
return portStr
}
func (s *server) handleConn(conn net.Conn) {
defer s.wg.Done()
defer conn.Close()
var response *gus.Response
req, err := ParseRequest(conn)
if err != nil {
response = BadRequest(err.Error())
return
} else {
req.Server = s
req.RemoteAddr = conn.RemoteAddr()
if tlsconn, ok := conn.(*tls.Conn); req != nil && ok {
state := tlsconn.ConnectionState()
req.TLSState = &state
}
response = s.handler(s.ctx, req)
if response == nil {
response = NotFound("Resource does not exist.")
}
defer response.Close()
}
_, _ = io.Copy(conn, NewResponseReader(response))
}
func (s *server) propagateCancel() {
go func() {
defer s.wg.Done()
<-s.ctx.Done()
_ = s.listener.Close()
}()
}
func (s *server) Closed() bool {
select {
case <-s.ctx.Done():
return true
default:
return false
}
}
|
