mirror of https://github.com/v2ray/v2ray-core
150 lines
3.2 KiB
Go
150 lines
3.2 KiB
Go
package buf
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import (
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"io"
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"time"
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"v2ray.com/core/common/errors"
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"v2ray.com/core/common/signal"
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)
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// Reader extends io.Reader with alloc.Buffer.
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type Reader interface {
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// Read reads content from underlying reader, and put it into an alloc.Buffer.
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Read() (MultiBuffer, error)
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}
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var ErrReadTimeout = newError("IO timeout")
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type TimeoutReader interface {
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ReadTimeout(time.Duration) (MultiBuffer, error)
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}
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// Writer extends io.Writer with alloc.Buffer.
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type Writer interface {
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// Write writes an alloc.Buffer into underlying writer.
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Write(MultiBuffer) error
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}
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// ReadFrom creates a Supplier to read from a given io.Reader.
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func ReadFrom(reader io.Reader) Supplier {
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return func(b []byte) (int, error) {
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return reader.Read(b)
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}
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}
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// ReadFullFrom creates a Supplier to read full buffer from a given io.Reader.
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func ReadFullFrom(reader io.Reader, size int) Supplier {
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return func(b []byte) (int, error) {
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return io.ReadFull(reader, b[:size])
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}
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}
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// ReadAtLeastFrom create a Supplier to read at least size bytes from the given io.Reader.
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func ReadAtLeastFrom(reader io.Reader, size int) Supplier {
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return func(b []byte) (int, error) {
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return io.ReadAtLeast(reader, b, size)
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}
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}
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func copyInternal(timer signal.ActivityTimer, reader Reader, writer Writer) error {
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for {
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buffer, err := reader.Read()
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if err != nil {
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return err
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}
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timer.Update()
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if buffer.IsEmpty() {
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buffer.Release()
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continue
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}
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if err := writer.Write(buffer); err != nil {
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buffer.Release()
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return err
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}
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}
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}
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// Copy dumps all payload from reader to writer or stops when an error occurs.
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// ActivityTimer gets updated as soon as there is a payload.
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func Copy(timer signal.ActivityTimer, reader Reader, writer Writer) error {
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err := copyInternal(timer, reader, writer)
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if err != nil && errors.Cause(err) != io.EOF {
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return err
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}
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return nil
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}
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// NewReader creates a new Reader.
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// The Reader instance doesn't take the ownership of reader.
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func NewReader(reader io.Reader) Reader {
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if mr, ok := reader.(MultiBufferReader); ok {
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return &readerAdpater{
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MultiBufferReader: mr,
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}
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}
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return &BytesToBufferReader{
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reader: reader,
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buffer: make([]byte, 32*1024),
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}
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}
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func NewMergingReader(reader io.Reader) Reader {
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return NewMergingReaderSize(reader, 32*1024)
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}
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func NewMergingReaderSize(reader io.Reader, size uint32) Reader {
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return &BytesToBufferReader{
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reader: reader,
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buffer: make([]byte, size),
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}
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}
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// ToBytesReader converts a Reaaer to io.Reader.
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func ToBytesReader(stream Reader) io.Reader {
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return &bufferToBytesReader{
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stream: stream,
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}
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}
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// NewWriter creates a new Writer.
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func NewWriter(writer io.Writer) Writer {
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if mw, ok := writer.(MultiBufferWriter); ok {
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return &writerAdapter{
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writer: mw,
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}
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}
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return &BufferToBytesWriter{
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writer: writer,
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}
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}
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func NewMergingWriter(writer io.Writer) Writer {
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return NewMergingWriterSize(writer, 4096)
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}
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func NewMergingWriterSize(writer io.Writer, size uint32) Writer {
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return &mergingWriter{
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writer: writer,
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buffer: make([]byte, size),
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}
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}
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func NewSequentialWriter(writer io.Writer) Writer {
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return &seqWriter{
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writer: writer,
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}
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}
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// ToBytesWriter converts a Writer to io.Writer
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func ToBytesWriter(writer Writer) io.Writer {
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return &bytesToBufferWriter{
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writer: writer,
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}
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}
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