forked from thingio/kapacitor
-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
91 lines (81 loc) · 1.59 KB
/
server.go
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
package agent
import (
"net"
"os"
"os/signal"
"strings"
"sync"
)
// A server accepts connections on a listener and
// spawns new Agents for each connection.
type Server struct {
listener net.Listener
accepter Accepter
conns chan net.Conn
mu sync.Mutex
stopped bool
stopping chan struct{}
}
type Accepter interface {
// Accept new connections from the listener and handle them accordingly.
// The typical action is to create a new Agent with the connection as both its in and out objects.
Accept(net.Conn)
}
// Create a new server.
func NewServer(l net.Listener, a Accepter) *Server {
return &Server{
listener: l,
accepter: a,
conns: make(chan net.Conn),
stopping: make(chan struct{}),
}
}
func (s *Server) Serve() error {
return s.run()
}
func (s *Server) Stop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.stopped {
return
}
s.stopped = true
close(s.stopping)
}
// Register a signal handler to stop the Server for the given signals.
func (s *Server) StopOnSignals(signals ...os.Signal) {
c := make(chan os.Signal)
signal.Notify(c, signals...)
go func() {
for range c {
s.Stop()
}
}()
}
func (s *Server) run() error {
errC := make(chan error, 1)
go func() {
for {
conn, err := s.listener.Accept()
if err != nil {
errC <- err
}
s.conns <- conn
}
}()
for {
select {
case <-s.stopping:
s.listener.Close()
return nil
case err := <-errC:
// If err is listener closed err ignore and return nil
if strings.Contains(err.Error(), "closed") {
return nil
}
return err
case conn := <-s.conns:
s.accepter.Accept(conn)
}
}
}