forked from toolshed/abra
85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
/*
|
|
Package sockets is a simple unix domain socket wrapper.
|
|
|
|
# Usage
|
|
|
|
For example:
|
|
|
|
import(
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
"github.com/docker/go-connections/sockets"
|
|
)
|
|
|
|
func main() {
|
|
l, err := sockets.NewUnixSocketWithOpts("/path/to/sockets",
|
|
sockets.WithChown(0,0),sockets.WithChmod(0660))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
echoStr := "hello"
|
|
|
|
go func() {
|
|
for {
|
|
conn, err := l.Accept()
|
|
if err != nil {
|
|
return
|
|
}
|
|
conn.Write([]byte(echoStr))
|
|
conn.Close()
|
|
}
|
|
}()
|
|
|
|
conn, err := net.Dial("unix", path)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
buf := make([]byte, 5)
|
|
if _, err := conn.Read(buf); err != nil {
|
|
panic(err)
|
|
} else if string(buf) != echoStr {
|
|
panic(fmt.Errorf("msg may lost"))
|
|
}
|
|
}
|
|
*/
|
|
package sockets
|
|
|
|
import (
|
|
"net"
|
|
"os"
|
|
"syscall"
|
|
)
|
|
|
|
// SockOption sets up socket file's creating option
|
|
type SockOption func(string) error
|
|
|
|
// NewUnixSocketWithOpts creates a unix socket with the specified options.
|
|
// By default, socket permissions are 0000 (i.e.: no access for anyone); pass
|
|
// WithChmod() and WithChown() to set the desired ownership and permissions.
|
|
//
|
|
// This function temporarily changes the system's "umask" to 0777 to work around
|
|
// a race condition between creating the socket and setting its permissions. While
|
|
// this should only be for a short duration, it may affect other processes that
|
|
// create files/directories during that period.
|
|
func NewUnixSocketWithOpts(path string, opts ...SockOption) (net.Listener, error) {
|
|
if err := syscall.Unlink(path); err != nil && !os.IsNotExist(err) {
|
|
return nil, err
|
|
}
|
|
|
|
l, err := listenUnix(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, op := range opts {
|
|
if err := op(path); err != nil {
|
|
_ = l.Close()
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return l, nil
|
|
}
|