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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-22 18:17:52 -05:00
v2fly/common/buf/io.go
2017-03-27 11:12:34 +02:00

104 lines
2.3 KiB
Go

package buf
import (
"io"
"time"
"v2ray.com/core/common/errors"
"v2ray.com/core/common/signal"
)
// Reader extends io.Reader with alloc.Buffer.
type Reader interface {
// Read reads content from underlying reader, and put it into an alloc.Buffer.
Read() (*Buffer, error)
}
var ErrReadTimeout = errors.New("Buf: IO timeout.")
type TimeoutReader interface {
ReadTimeout(time.Duration) (*Buffer, error)
}
// Writer extends io.Writer with alloc.Buffer.
type Writer interface {
// Write writes an alloc.Buffer into underlying writer.
Write(*Buffer) error
}
// ReadFrom creates a Supplier to read from a given io.Reader.
func ReadFrom(reader io.Reader) Supplier {
return func(b []byte) (int, error) {
return reader.Read(b)
}
}
// ReadFullFrom creates a Supplier to read full buffer from a given io.Reader.
func ReadFullFrom(reader io.Reader, size int) Supplier {
return func(b []byte) (int, error) {
return io.ReadFull(reader, b[:size])
}
}
// Pipe dumps all payload from reader to writer, until an error occurs.
// ActivityTimer gets updated as soon as there is a payload.
func Pipe(timer *signal.ActivityTimer, reader Reader, writer Writer) error {
for {
buffer, err := reader.Read()
if err != nil {
return err
}
timer.UpdateActivity()
if buffer.IsEmpty() {
buffer.Release()
continue
}
err = writer.Write(buffer)
if err != nil {
buffer.Release()
return err
}
}
}
// PipeUntilEOF behaves the same as Pipe(). The only difference is PipeUntilEOF returns nil on EOF.
func PipeUntilEOF(timer *signal.ActivityTimer, reader Reader, writer Writer) error {
err := Pipe(timer, reader, writer)
if err != nil && errors.Cause(err) != io.EOF {
return err
}
return nil
}
// NewReader creates a new Reader.
// The Reader instance doesn't take the ownership of reader.
func NewReader(reader io.Reader) Reader {
return &BytesToBufferReader{
reader: reader,
}
}
// ToBytesReader converts a Reaaer to io.Reader.
func ToBytesReader(stream Reader) io.Reader {
return &bufferToBytesReader{
stream: stream,
}
}
// NewWriter creates a new Writer.
func NewWriter(writer io.Writer) Writer {
return &BufferToBytesWriter{
writer: writer,
}
}
// ToBytesWriter converts a Writer to io.Writer
func ToBytesWriter(writer Writer) io.Writer {
return &bytesToBufferWriter{
writer: writer,
}
}