package buf
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import (
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"io"
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"net"
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"os"
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"syscall"
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"time"
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)
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// Reader extends io.Reader with MultiBuffer.
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type Reader interface {
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// ReadMultiBuffer reads content from underlying reader, and put it into a MultiBuffer.
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ReadMultiBuffer() (MultiBuffer, error)
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}
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// ErrReadTimeout is an error that happens with IO timeout.
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var ErrReadTimeout = newError("IO timeout")
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// TimeoutReader is a reader that returns error if Read() operation takes longer than the given timeout.
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type TimeoutReader interface {
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ReadMultiBufferTimeout(time.Duration) (MultiBuffer, error)
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}
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// Writer extends io.Writer with MultiBuffer.
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type Writer interface {
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// WriteMultiBuffer writes a MultiBuffer into underlying writer.
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WriteMultiBuffer(MultiBuffer) error
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}
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// WriteAllBytes ensures all bytes are written into the given writer.
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func WriteAllBytes(writer io.Writer, payload []byte) error {
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for len(payload) > 0 {
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n, err := writer.Write(payload)
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if err != nil {
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return err
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}
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payload = payload[n:]
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}
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return nil
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}
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func isPacketReader(reader io.Reader) bool {
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_, ok := reader.(net.PacketConn)
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return ok
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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.(Reader); ok {
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return mr
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}
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if isPacketReader(reader) {
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return &PacketReader{
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Reader: reader,
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}
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}
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_, isFile := reader.(*os.File)
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if !isFile && useReadv {
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if sc, ok := reader.(syscall.Conn); ok {
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rawConn, err := sc.SyscallConn()
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if err != nil {
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newError("failed to get sysconn").Base(err).WriteToLog()
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} else {
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return NewReadVReader(reader, rawConn)
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}
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}
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}
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return &SingleReader{
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Reader: reader,
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}
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}
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// NewPacketReader creates a new PacketReader based on the given reader.
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func NewPacketReader(reader io.Reader) Reader {
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if mr, ok := reader.(Reader); ok {
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return mr
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}
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return &PacketReader{
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Reader: reader,
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}
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}
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func isPacketWriter(writer io.Writer) bool {
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if _, ok := writer.(net.PacketConn); ok {
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return true
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}
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// If the writer doesn't implement syscall.Conn, it is probably not a TCP connection.
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if _, ok := writer.(syscall.Conn); !ok {
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return true
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}
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return false
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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.(Writer); ok {
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return mw
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}
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if isPacketWriter(writer) {
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return &SequentialWriter{
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Writer: writer,
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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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