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97 lines
2.2 KiB
97 lines
2.2 KiB
package buf
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import (
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"io"
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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() (*Buffer, 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(*Buffer) 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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// Pipe dumps all payload from reader to writer, until an error occurs.
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// ActivityTimer gets updated as soon as there is a payload.
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func Pipe(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.UpdateActivity()
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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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err = writer.Write(buffer)
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if 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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// PipeUntilEOF behaves the same as Pipe(). The only difference is PipeUntilEOF returns nil on EOF.
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func PipeUntilEOF(timer *signal.ActivityTimer, reader Reader, writer Writer) error {
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err := Pipe(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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return &BytesToBufferReader{
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reader: reader,
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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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return &BufferToBytesWriter{
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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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