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|
package socket
import (
"context"
"log"
"sync"
"time"
"tunnel/pkg/server/env"
"tunnel/pkg/server/queue"
)
type redialSocket struct {
dialSocket
SendKeep bool
}
type redialConn struct {
s *redialSocket
e env.Env
mu sync.Mutex
skip chan struct{}
cc chan *conn
q queue.Q
ctx context.Context
cancel context.CancelFunc
}
var closedchan = make(chan struct{})
func init() {
close(closedchan)
}
func (s *redialSocket) New(env env.Env) (Conn, error) {
ctx, cancel := context.WithCancel(context.TODO())
c := &redialConn{
s: s,
e: env,
cc: make(chan *conn),
q: queue.New(),
ctx: ctx,
cancel: cancel,
}
go c.loop(ctx)
return c, nil
}
func (c *redialConn) loop(ctx context.Context) {
defer close(c.cc)
conntry := 0
for {
conntry++
conn, err := dial(ctx, c.e, c.s.Proto, c.s.Addr)
if err != nil {
if ctx.Err() != nil {
return
}
log.Println(err)
if conntry == 1 {
c.SkipUp()
}
t := time.NewTimer(time.Second)
select {
case <-ctx.Done():
return
case <-t.C:
}
continue
}
if conntry > 1 {
c.SkipDown()
}
conntry = 0
c.cc <- conn
for loop := true; loop; {
select {
case b := <-c.q:
if _, err := conn.Write(b); err != nil {
conn.Close()
loop = false
}
case <-conn.closed:
loop = false
case <-ctx.Done():
conn.Close()
return
}
}
}
}
func (c *redialConn) Send(wq queue.Q) error {
for conn := range c.cc {
conn.Send(wq)
conn.Close()
}
return nil
}
func (c *redialConn) SkipUp() {
if c.s.SendKeep {
return
}
c.mu.Lock()
if c.skip == nil {
c.skip = closedchan
} else {
close(c.skip)
}
c.mu.Unlock()
}
func (c *redialConn) SkipDown() {
if c.s.SendKeep {
return
}
c.mu.Lock()
c.skip = nil
c.mu.Unlock()
}
func (c *redialConn) Skip() chan struct{} {
if c.s.SendKeep {
return nil
}
c.mu.Lock()
if c.skip == nil {
c.skip = make(chan struct{})
}
d := c.skip
c.mu.Unlock()
return d
}
func (c *redialConn) Recv(rq queue.Q) (err error) {
for b := range rq {
select {
case c.q <- b:
case <-c.Skip():
case <-c.ctx.Done():
return
}
}
return
}
func (c *redialConn) String() string {
return "redial"
}
func (c *redialConn) Close() error {
c.cancel()
return nil
}
func (c *redialSocket) Close() {
}
func init() {
register("redial", "dial even after close", redialSocket{})
}
|
