forked from valyala/fasthttp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
reuseport.go
56 lines (50 loc) · 1.61 KB
/
reuseport.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
// +build linux darwin dragonfly freebsd netbsd openbsd rumprun
// Package reuseport provides TCP net.Listener with SO_REUSEPORT support.
//
// SO_REUSEPORT allows linear scaling server performance on multi-CPU servers.
// See https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/ for more details :)
//
// The package is based on https://github.com/kavu/go_reuseport .
package reuseport
import (
"fmt"
"github.com/valyala/tcplisten"
"net"
"strings"
)
// ErrNoReusePort is returned if the OS doesn't support SO_REUSEPORT.
type ErrNoReusePort struct {
err error
}
// Error implements error interface.
func (e *ErrNoReusePort) Error() string {
return fmt.Sprintf("The OS doesn't support SO_REUSEPORT: %s", e.err)
}
// Listen returns TCP listener with SO_REUSEPORT option set.
//
// The returned listener tries enabling the following TCP options, which usually
// have positive impact on performance:
//
// - TCP_DEFER_ACCEPT. This option expects that the server reads from accepted
// connections before writing to them.
//
// - TCP_FASTOPEN. See https://lwn.net/Articles/508865/ for details.
//
// Use https://github.com/valyala/tcplisten if you want customizing
// these options.
//
// Only tcp4 and tcp6 networks are supported.
//
// ErrNoReusePort error is returned if the system doesn't support SO_REUSEPORT.
func Listen(network, addr string) (net.Listener, error) {
ln, err := cfg.NewListener(network, addr)
if err != nil && strings.Contains(err.Error(), "SO_REUSEPORT") {
return nil, &ErrNoReusePort{err}
}
return ln, err
}
var cfg = &tcplisten.Config{
ReusePort: true,
DeferAccept: true,
FastOpen: true,
}