mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-07-01 19:45:24 +00:00
130 lines
3.0 KiB
Go
130 lines
3.0 KiB
Go
package buf
|
|
|
|
import (
|
|
"io"
|
|
"time"
|
|
|
|
"v2ray.com/core/common/errors"
|
|
"v2ray.com/core/common/signal"
|
|
)
|
|
|
|
type errorHandler func(error) error
|
|
type dataHandler func(MultiBuffer)
|
|
|
|
type copyHandler struct {
|
|
onReadError []errorHandler
|
|
onData []dataHandler
|
|
onWriteError []errorHandler
|
|
}
|
|
|
|
func (h *copyHandler) readFrom(reader Reader) (MultiBuffer, error) {
|
|
mb, err := reader.ReadMultiBuffer()
|
|
if err != nil {
|
|
for _, handler := range h.onReadError {
|
|
err = handler(err)
|
|
}
|
|
}
|
|
return mb, err
|
|
}
|
|
|
|
func (h *copyHandler) writeTo(writer Writer, mb MultiBuffer) error {
|
|
err := writer.WriteMultiBuffer(mb)
|
|
if err != nil {
|
|
for _, handler := range h.onWriteError {
|
|
err = handler(err)
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
|
|
// SizeCounter is for counting bytes copied by Copy().
|
|
type SizeCounter struct {
|
|
Size int64
|
|
}
|
|
|
|
// CopyOption is an option for copying data.
|
|
type CopyOption func(*copyHandler)
|
|
|
|
// IgnoreReaderError is a CopyOption that ignores errors from reader. Copy will continue in such case.
|
|
func IgnoreReaderError() CopyOption {
|
|
return func(handler *copyHandler) {
|
|
handler.onReadError = append(handler.onReadError, func(err error) error {
|
|
return nil
|
|
})
|
|
}
|
|
}
|
|
|
|
// IgnoreWriterError is a CopyOption that ignores errors from writer. Copy will continue in such case.
|
|
func IgnoreWriterError() CopyOption {
|
|
return func(handler *copyHandler) {
|
|
handler.onWriteError = append(handler.onWriteError, func(err error) error {
|
|
return nil
|
|
})
|
|
}
|
|
}
|
|
|
|
// UpdateActivity is a CopyOption to update activity on each data copy operation.
|
|
func UpdateActivity(timer signal.ActivityUpdater) CopyOption {
|
|
return func(handler *copyHandler) {
|
|
handler.onData = append(handler.onData, func(MultiBuffer) {
|
|
timer.Update()
|
|
})
|
|
}
|
|
}
|
|
|
|
// CountSize is a CopyOption that sums the total size of data copied into the given SizeCounter.
|
|
func CountSize(sc *SizeCounter) CopyOption {
|
|
return func(handler *copyHandler) {
|
|
handler.onData = append(handler.onData, func(b MultiBuffer) {
|
|
sc.Size += int64(b.Len())
|
|
})
|
|
}
|
|
}
|
|
|
|
func copyInternal(reader Reader, writer Writer, handler *copyHandler) error {
|
|
for {
|
|
buffer, err := handler.readFrom(reader)
|
|
if !buffer.IsEmpty() {
|
|
for _, handler := range handler.onData {
|
|
handler(buffer)
|
|
}
|
|
|
|
if werr := handler.writeTo(writer, buffer); werr != nil {
|
|
buffer.Release()
|
|
return werr
|
|
}
|
|
}
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
// Copy dumps all payload from reader to writer or stops when an error occurs. It returns nil when EOF.
|
|
func Copy(reader Reader, writer Writer, options ...CopyOption) error {
|
|
handler := new(copyHandler)
|
|
for _, option := range options {
|
|
option(handler)
|
|
}
|
|
err := copyInternal(reader, writer, handler)
|
|
if err != nil && errors.Cause(err) != io.EOF {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var ErrNotTimeoutReader = newError("not a TimeoutReader")
|
|
|
|
func CopyOnceTimeout(reader Reader, writer Writer, timeout time.Duration) error {
|
|
timeoutReader, ok := reader.(TimeoutReader)
|
|
if !ok {
|
|
return ErrNotTimeoutReader
|
|
}
|
|
mb, err := timeoutReader.ReadMultiBufferTimeout(timeout)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return writer.WriteMultiBuffer(mb)
|
|
}
|