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package drive
import (
"golang.org/x/net/context"
"io"
"sync"
"time"
)
const MaxIdleTimeout = time.Second * 120
const TimeoutTimerInterval = time.Second * 10
type timeoutReaderWrapper func(io.Reader) io.Reader
func getTimeoutReaderWrapperContext() (timeoutReaderWrapper, context.Context) {
ctx, cancel := context.WithCancel(context.TODO())
wrapper := func(r io.Reader) io.Reader {
return getTimeoutReader(r, cancel)
}
return wrapper, ctx
}
func getTimeoutReaderContext(r io.Reader) (io.Reader, context.Context) {
ctx, cancel := context.WithCancel(context.TODO())
return getTimeoutReader(r, cancel), ctx
}
func getTimeoutReader(r io.Reader, cancel context.CancelFunc) io.Reader {
return &TimeoutReader{
reader: r,
cancel: cancel,
mutex: &sync.Mutex{},
}
}
type TimeoutReader struct {
reader io.Reader
cancel context.CancelFunc
lastActivity time.Time
timer *time.Timer
mutex *sync.Mutex
done bool
}
func (self *TimeoutReader) Read(p []byte) (int, error) {
if self.timer == nil {
self.startTimer()
}
self.mutex.Lock()
// Read
n, err := self.reader.Read(p)
self.lastActivity = time.Now()
self.done = (err != nil)
self.mutex.Unlock()
if self.done {
self.stopTimer()
}
return n, err
}
func (self *TimeoutReader) startTimer() {
self.mutex.Lock()
defer self.mutex.Unlock()
if !self.done {
self.timer = time.AfterFunc(TimeoutTimerInterval, self.timeout)
}
}
func (self *TimeoutReader) stopTimer() {
self.mutex.Lock()
defer self.mutex.Unlock()
if self.timer != nil {
self.timer.Stop()
}
}
func (self *TimeoutReader) timeout() {
self.mutex.Lock()
if self.done {
self.mutex.Unlock()
return
}
if time.Since(self.lastActivity) > MaxIdleTimeout {
self.cancel()
self.mutex.Unlock()
return
}
self.mutex.Unlock()
self.startTimer()
}
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