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// +build !windows
package util
import (
"errors"
"fmt"
"net"
"os"
"strings"
"syscall"
)
// CreateListener crates socket listener based on DSN definition.
func CreateListener(address string) (net.Listener, error) {
dsn := strings.Split(address, "://")
if len(dsn) != 2 {
return nil, errors.New("invalid DSN (tcp://:6001, unix://file.sock)")
}
if dsn[0] != "unix" && dsn[0] != "tcp" {
return nil, errors.New("invalid Protocol (tcp://:6001, unix://file.sock)")
}
if dsn[0] == "unix" && fileExists(dsn[1]) {
err := syscall.Unlink(dsn[1])
if err != nil {
return nil, fmt.Errorf("error during the unlink syscall: error %v", err)
}
}
ls := net.ListenConfig{
Control: func(network, address string, c syscall.RawConn) error {
return c.Control(func(descriptor uintptr) {
syscall.SetsockoptInt(int(descriptor), syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1)
})
},
}
return ls.Listen(dsn[0], dsn[1])
}
// fileExists checks if a file exists and is not a directory before we
// try using it to prevent further errors.
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
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