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package socket
import (
"errors"
"fmt"
"log"
"net"
"reflect"
"sort"
"strings"
"sync"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
var ErrAlreadyClosed = errors.New("already closed")
type Conn interface {
Send(wq queue.Q) error
Recv(rq queue.Q) error
Close() error
}
type S interface {
New(env env.Env) (Conn, error)
Close()
}
type Single interface {
Single()
}
type conn struct {
net.Conn
desc string
info string
once sync.Once
closed chan struct{}
}
func newConn(cn net.Conn, desc, info string) *conn {
c := &conn{
Conn: cn,
desc: desc,
info: info,
closed: make(chan struct{}),
}
return c
}
func (c *conn) Send(wq queue.Q) error {
return queue.IoCopy(c, wq.Writer())
}
func (c *conn) Recv(rq queue.Q) error {
return queue.IoCopy(rq.Reader(), c)
}
func (c *conn) String() string {
return c.info
}
func (c *conn) Close() error {
err := ErrAlreadyClosed
c.once.Do(func() {
log.Println("close", c.desc)
err = c.Conn.Close()
close(c.closed)
})
return err
}
func New(desc string, e env.Env) (S, error) {
name, opts := opts.Parse(desc)
sockType, ok := sockets[name]
if !ok {
return nil, fmt.Errorf("%s: unknown type", name)
}
s := reflect.New(sockType.t).Interface()
if err := opts.Configure(s); err != nil {
return nil, fmt.Errorf("%s: %w", name, err)
}
if i, ok := s.(interface{ Prepare(env.Env) error }); ok {
if err := i.Prepare(e); err != nil {
return nil, fmt.Errorf("%s: %w", name, err)
}
}
return s.(S), nil
}
func parseProtoAddr(proto, addr string) (string, string) {
if proto == "tcp" || proto == "udp" {
if strings.HasPrefix(addr, "%") {
addr = "localhost:" + addr[1:]
}
}
return proto, addr
}
type Type struct {
Desc string
Name string
Param []opts.Param
t reflect.Type
}
var sockets = map[string]*Type{}
func register(name string, desc string, i interface{}) {
t := reflect.TypeOf(i)
if t.Kind() != reflect.Struct {
log.Panicf("non-struct type '%s'", t.String())
}
if _, ok := reflect.New(t).Interface().(S); !ok {
log.Panicf("uncompatible socket type '%s'", t.String())
}
if _, ok := sockets[name]; ok {
log.Panicf("duplicate socket name '%s'", name)
}
sockets[name] = &Type{
Desc: desc,
Name: name,
Param: opts.Parametrize(t),
t: t,
}
}
func GetList() []string {
var list []string
for k := range sockets {
list = append(list, k)
}
sort.Strings(list)
return list
}
func GetType(name string) *Type {
return sockets[name]
}
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