/
keepalive.go
70 lines (57 loc) · 1.4 KB
/
keepalive.go
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// refer: https://github.com/felixge/tcpkeepalive
// only for Linux
package phantom_tcp
import (
"net"
"os"
"syscall"
"time"
)
type KeepAliveConfig struct {
KeepAlive bool
KeepAliveIdle time.Duration
KeepAliveCount int
KeepAliveInterval time.Duration
}
func SetKeepAlive(c *net.TCPConn, cfg *KeepAliveConfig) error {
if err := c.SetKeepAlive(cfg.KeepAlive); err != nil {
return err
}
file, err := c.File()
if err != nil {
return err
}
fd := int(file.Fd())
if cfg.KeepAliveIdle != 0 {
if err := setIdle(fd, secs(cfg.KeepAliveIdle)); err != nil {
return err
}
}
if cfg.KeepAliveCount != 0 {
if err := setCount(fd, cfg.KeepAliveCount); err != nil {
return err
}
}
if cfg.KeepAliveInterval != 0 {
if err := setInterval(fd, secs(cfg.KeepAliveInterval)); err != nil {
return nil
}
}
return nil
}
func secs(t time.Duration) int {
t += (time.Second - time.Nanosecond)
return int(t.Seconds())
}
func setIdle(fd int, n int) error {
return os.NewSyscallError("setsockopt",
syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, n))
}
func setCount(fd int, n int) error {
return os.NewSyscallError("setsockopt",
syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, n))
}
func setInterval(fd int, n int) error {
return os.NewSyscallError("setsockopt",
syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, n))
}