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v2fly/common/io/chan_reader.go
2016-11-10 23:41:28 +01:00

63 lines
932 B
Go

package io
import (
"io"
"sync"
"v2ray.com/core/common/alloc"
)
type ChanReader struct {
sync.Mutex
stream Reader
current *alloc.Buffer
eof bool
}
func NewChanReader(stream Reader) *ChanReader {
return &ChanReader{
stream: stream,
}
}
// Private: Visible for testing.
func (this *ChanReader) Fill() {
b, err := this.stream.Read()
this.current = b
if err != nil {
this.eof = true
this.current = nil
}
}
func (this *ChanReader) Read(b []byte) (int, error) {
if this.eof {
return 0, io.EOF
}
this.Lock()
defer this.Unlock()
if this.current == nil {
this.Fill()
if this.eof {
return 0, io.EOF
}
}
nBytes, err := this.current.Read(b)
if this.current.IsEmpty() {
this.current.Release()
this.current = nil
}
return nBytes, err
}
func (this *ChanReader) Release() {
this.Lock()
defer this.Unlock()
this.eof = true
this.current.Release()
this.current = nil
this.stream = nil
}