forked from googollee/go-socket.io
/
wrapper.go
150 lines (122 loc) · 2.79 KB
/
wrapper.go
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package websocket
import (
"fmt"
"io"
"io/ioutil"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/dmskys/go-socket.io/engineio/frame"
"github.com/dmskys/go-socket.io/engineio/transport"
)
type wrapper struct {
*websocket.Conn
writeLocker *sync.Mutex
readLocker *sync.Mutex
}
func newWrapper(conn *websocket.Conn) wrapper {
return wrapper{
Conn: conn,
writeLocker: new(sync.Mutex),
readLocker: new(sync.Mutex),
}
}
func (w wrapper) NextReader() (frame.Type, io.ReadCloser, error) {
w.readLocker.Lock()
defer w.readLocker.Unlock()
// The wrapper remains locked until the returned ReadCloser is Closed.
typ, r, err := w.Conn.NextReader()
if err != nil {
return 0, nil, err
}
switch typ {
case websocket.TextMessage:
return frame.String, newRcWrapper(w.readLocker, r), nil
case websocket.BinaryMessage:
return frame.Binary, newRcWrapper(w.readLocker, r), nil
}
return 0, nil, transport.ErrInvalidFrame
}
type rcWrapper struct {
io.Reader
nagTimer *time.Timer
quitNag chan struct{}
l *sync.Mutex
}
func newRcWrapper(l *sync.Mutex, r io.Reader) rcWrapper {
timer := time.NewTimer(30 * time.Second)
q := make(chan struct{})
go func() {
select {
case <-q:
case <-timer.C:
fmt.Println("Did you forget to Close() the ReadCloser from NextReader?")
}
}()
return rcWrapper{
nagTimer: timer,
quitNag: q,
l: l,
Reader: r,
}
}
func (r rcWrapper) Close() error {
// Stop the nagger.
r.l.Lock()
defer r.l.Unlock()
r.nagTimer.Stop()
close(r.quitNag)
// Attempt to drain the Reader.
_, err := io.Copy(ioutil.Discard, r)
return err
}
func (w wrapper) NextWriter(FType frame.Type) (io.WriteCloser, error) {
var t int
switch FType {
case frame.String:
t = websocket.TextMessage
case frame.Binary:
t = websocket.BinaryMessage
default:
return nil, transport.ErrInvalidFrame
}
w.writeLocker.Lock()
writer, err := w.Conn.NextWriter(t)
// The wrapper remains locked until the returned WriteCloser is Closed.
if err != nil {
w.writeLocker.Unlock()
return nil, err
}
return newWcWrapper(w.writeLocker, writer), nil
}
type wcWrapper struct {
io.WriteCloser
nagTimer *time.Timer
l *sync.Mutex
quitNag chan struct{}
}
func newWcWrapper(l *sync.Mutex, w io.WriteCloser) wcWrapper {
timer := time.NewTimer(30 * time.Second)
chQuit := make(chan struct{})
go func() {
select {
case <-chQuit:
case <-timer.C:
fmt.Println("Did you forget to Close() the WriteCloser from NextWriter?")
}
}()
return wcWrapper{
nagTimer: timer,
quitNag: chQuit,
l: l,
WriteCloser: w,
}
}
func (w wcWrapper) Close() error {
// Stop the nagger.
w.nagTimer.Stop()
close(w.quitNag)
// Unlock the wrapper's write lock for future calls to NextWriter.
defer w.l.Unlock()
return w.WriteCloser.Close()
}