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direct.go
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direct.go
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package ray
import (
"errors"
"io"
"sync"
"time"
"github.com/v2ray/v2ray-core/common/alloc"
)
const (
bufferSize = 128
)
var (
ErrIOTimeout = errors.New("IO Timeout")
)
// NewRay creates a new Ray for direct traffic transport.
func NewRay() Ray {
return &directRay{
Input: NewStream(),
Output: NewStream(),
}
}
type directRay struct {
Input *Stream
Output *Stream
}
func (this *directRay) OutboundInput() InputStream {
return this.Input
}
func (this *directRay) OutboundOutput() OutputStream {
return this.Output
}
func (this *directRay) InboundInput() OutputStream {
return this.Input
}
func (this *directRay) InboundOutput() InputStream {
return this.Output
}
type Stream struct {
access sync.RWMutex
closed bool
buffer chan *alloc.Buffer
}
func NewStream() *Stream {
return &Stream{
buffer: make(chan *alloc.Buffer, bufferSize),
}
}
func (this *Stream) Read() (*alloc.Buffer, error) {
if this.buffer == nil {
return nil, io.EOF
}
this.access.RLock()
if this.buffer == nil {
this.access.RUnlock()
return nil, io.EOF
}
channel := this.buffer
this.access.RUnlock()
result, open := <-channel
if !open {
return nil, io.EOF
}
return result, nil
}
func (this *Stream) Write(data *alloc.Buffer) error {
for !this.closed {
err := this.TryWriteOnce(data)
if err != ErrIOTimeout {
return err
}
}
return io.EOF
}
func (this *Stream) TryWriteOnce(data *alloc.Buffer) error {
this.access.RLock()
defer this.access.RUnlock()
if this.closed {
return io.EOF
}
select {
case this.buffer <- data:
return nil
case <-time.After(2 * time.Second):
return ErrIOTimeout
}
}
func (this *Stream) Close() {
if this.closed {
return
}
this.access.Lock()
defer this.access.Unlock()
if this.closed {
return
}
this.closed = true
close(this.buffer)
}
func (this *Stream) Release() {
if this.buffer == nil {
return
}
this.Close()
this.access.Lock()
defer this.access.Unlock()
if this.buffer == nil {
return
}
for data := range this.buffer {
data.Release()
}
this.buffer = nil
}