buf

package
v4.19.1+incompatible Latest Latest
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 Go to latest Published: Jun 3, 2019 License: MIT Imports: 13 Imported by: 6,048

Documentation

Overview

Package buf provides a light-weight memory allocation mechanism.

Index

Constants

View Source 
const (
	// Size of a regular buffer.
	Size = 2048
)

Variables

View Source 
var ErrNotTimeoutReader = newError("not a TimeoutReader")
View Source 
var ErrReadTimeout = newError("IO timeout")

ErrReadTimeout is an error that happens with IO timeout.

Functions

func Copy 

func Copy(reader Reader, writer Writer, options ...CopyOption) error

Copy dumps all payload from reader to writer or stops when an error occurs. It returns nil when EOF.

func CopyOnceTimeout 

func CopyOnceTimeout(reader Reader, writer Writer, timeout time.Duration) error

func IsReadError 

func IsReadError(err error) bool

IsReadError returns true if the error in Copy() comes from reading.

func IsWriteError 

func IsWriteError(err error) bool

IsWriteError returns true if the error in Copy() comes from writing.

func MergeMulti 

func MergeMulti(dest MultiBuffer, src MultiBuffer) (MultiBuffer, MultiBuffer)

MergeMulti merges content from src to dest, and returns the new address of dest and src

func ReadAllToBytes 

func ReadAllToBytes(reader io.Reader) ([]byte, error)

ReadAllToBytes reads all content from the reader into a byte array, until EOF.

func SplitFirst 

func SplitFirst(mb MultiBuffer) (MultiBuffer, *Buffer)

SplitFirst splits the first Buffer from the beginning of the MultiBuffer.

func SplitSize 

func SplitSize(mb MultiBuffer, size int32) (MultiBuffer, MultiBuffer)

SplitSize splits the beginning of the MultiBuffer into another one, for at most size bytes.

func WriteAllBytes 

func WriteAllBytes(writer io.Writer, payload []byte) error

WriteAllBytes ensures all bytes are written into the given writer.

Types

type Buffer 

type Buffer struct {
	// contains filtered or unexported fields
}

Buffer is a recyclable allocation of a byte array. Buffer.Release() recycles the buffer into an internal buffer pool, in order to recreate a buffer more quickly.

func New 

func New() *Buffer

New creates a Buffer with 0 length and 2K capacity.

func ReadBuffer 

func ReadBuffer(r io.Reader) (*Buffer, error)

ReadBuffer reads a Buffer from the given reader, without allocating large buffer in advance.

func StackNew 

func StackNew() Buffer

StackNew creates a new Buffer object on stack. This method is for buffers that is released in the same function.

func (*Buffer) Advance 

func (b *Buffer) Advance(from int32)

Advance cuts the buffer at the given position.

func (*Buffer) Byte 

func (b *Buffer) Byte(index int32) byte

Byte returns the bytes at index.

func (*Buffer) Bytes 

func (b *Buffer) Bytes() []byte

Bytes returns the content bytes of this Buffer.

func (*Buffer) BytesFrom 

func (b *Buffer) BytesFrom(from int32) []byte

BytesFrom returns a slice of this Buffer starting from the given position.

func (*Buffer) BytesRange 

func (b *Buffer) BytesRange(from, to int32) []byte

BytesRange returns a slice of this buffer with given from and to boundary.

func (*Buffer) BytesTo 

func (b *Buffer) BytesTo(to int32) []byte

BytesTo returns a slice of this Buffer from start to the given position.

func (*Buffer) Clear 

func (b *Buffer) Clear()

Clear clears the content of the buffer, results an empty buffer with Len() = 0.

func (*Buffer) Extend 

func (b *Buffer) Extend(n int32) []byte

Extend increases the buffer size by n bytes, and returns the extended part. It panics if result size is larger than buf.Size.

func (*Buffer) IsEmpty 

func (b *Buffer) IsEmpty() bool

IsEmpty returns true if the buffer is empty.

func (*Buffer) IsFull 

func (b *Buffer) IsFull() bool

IsFull returns true if the buffer has no more room to grow.

func (*Buffer) Len 

func (b *Buffer) Len() int32

Len returns the length of the buffer content.

func (*Buffer) Read 

func (b *Buffer) Read(data []byte) (int, error)

Read implements io.Reader.Read().

func (*Buffer) ReadFrom 

func (b *Buffer) ReadFrom(reader io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

func (*Buffer) ReadFullFrom 

func (b *Buffer) ReadFullFrom(reader io.Reader, size int32) (int64, error)

ReadFullFrom reads exact size of bytes from given reader, or until error occurs.

func (*Buffer) Release 

func (b *Buffer) Release()

Release recycles the buffer into an internal buffer pool.

func (*Buffer) Resize 

func (b *Buffer) Resize(from, to int32)

Resize cuts the buffer at the given position.

func (*Buffer) SetByte 

func (b *Buffer) SetByte(index int32, value byte)

SetByte sets the byte value at index.

func (*Buffer) String 

func (b *Buffer) String() string

String returns the string form of this Buffer.

func (*Buffer) Write 

func (b *Buffer) Write(data []byte) (int, error)

Write implements Write method in io.Writer.

func (*Buffer) WriteByte 

func (b *Buffer) WriteByte(v byte) error

WriteByte writes a single byte into the buffer.

func (*Buffer) WriteString 

func (b *Buffer) WriteString(s string) (int, error)

WriteString implements io.StringWriter.

type BufferToBytesWriter 

type BufferToBytesWriter struct {
	io.Writer
	// contains filtered or unexported fields
}

BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.

func (*BufferToBytesWriter) ReadFrom 

func (w *BufferToBytesWriter) ReadFrom(reader io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

func (*BufferToBytesWriter) WriteMultiBuffer 

func (w *BufferToBytesWriter) WriteMultiBuffer(mb MultiBuffer) error

WriteMultiBuffer implements Writer. This method takes ownership of the given buffer.

type BufferedReader 

type BufferedReader struct {
	// Reader is the underlying reader to be read from
	Reader Reader
	// Buffer is the internal buffer to be read from first
	Buffer MultiBuffer
	// Spliter is a function to read bytes from MultiBuffer
	Spliter func(MultiBuffer, []byte) (MultiBuffer, int)
}

BufferedReader is a Reader that keeps its internal buffer.

func (*BufferedReader) BufferedBytes 

func (r *BufferedReader) BufferedBytes() int32

BufferedBytes returns the number of bytes that is cached in this reader.

func (*BufferedReader) Close 

func (r *BufferedReader) Close() error

Close implements io.Closer.

func (*BufferedReader) Interrupt 

func (r *BufferedReader) Interrupt()

Interrupt implements common.Interruptible.

func (*BufferedReader) Read 

func (r *BufferedReader) Read(b []byte) (int, error)

Read implements io.Reader. It reads from internal buffer first (if available) and then reads from the underlying reader.

func (*BufferedReader) ReadAtMost 

func (r *BufferedReader) ReadAtMost(size int32) (MultiBuffer, error)

ReadAtMost returns a MultiBuffer with at most size.

func (*BufferedReader) ReadByte 

func (r *BufferedReader) ReadByte() (byte, error)

ReadByte implements io.ByteReader.

func (*BufferedReader) ReadMultiBuffer 

func (r *BufferedReader) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

func (*BufferedReader) WriteTo 

func (r *BufferedReader) WriteTo(writer io.Writer) (int64, error)

WriteTo implements io.WriterTo.

type BufferedWriter 

type BufferedWriter struct {
	sync.Mutex
	// contains filtered or unexported fields
}

BufferedWriter is a Writer with internal buffer.

func NewBufferedWriter 

func NewBufferedWriter(writer Writer) *BufferedWriter

NewBufferedWriter creates a new BufferedWriter.

func (*BufferedWriter) Close 

func (w *BufferedWriter) Close() error

Close implements io.Closable.

func (*BufferedWriter) Flush 

func (w *BufferedWriter) Flush() error

Flush flushes buffered content into underlying writer.

func (*BufferedWriter) ReadFrom 

func (w *BufferedWriter) ReadFrom(reader io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

func (*BufferedWriter) SetBuffered 

func (w *BufferedWriter) SetBuffered(f bool) error

SetBuffered sets whether the internal buffer is used. If set to false, Flush() will be called to clear the buffer.

func (*BufferedWriter) Write 

func (w *BufferedWriter) Write(b []byte) (int, error)

Write implements io.Writer.

func (*BufferedWriter) WriteByte 

func (w *BufferedWriter) WriteByte(c byte) error

WriteByte implements io.ByteWriter.

func (*BufferedWriter) WriteMultiBuffer 

func (w *BufferedWriter) WriteMultiBuffer(b MultiBuffer) error

WriteMultiBuffer implements Writer. It takes ownership of the given MultiBuffer.

type CopyOption 

type CopyOption func(*copyHandler)

CopyOption is an option for copying data.

func CountSize 

func CountSize(sc *SizeCounter) CopyOption

CountSize is a CopyOption that sums the total size of data copied into the given SizeCounter.

func UpdateActivity 

func UpdateActivity(timer signal.ActivityUpdater) CopyOption

UpdateActivity is a CopyOption to update activity on each data copy operation.

type MultiBuffer 

type MultiBuffer []*Buffer

MultiBuffer is a list of Buffers. The order of Buffer matters.

func Compact 

func Compact(mb MultiBuffer) MultiBuffer

Compact returns another MultiBuffer by merging all content of the given one together.

func MergeBytes 

func MergeBytes(dest MultiBuffer, src []byte) MultiBuffer

MergeBytes merges the given bytes into MultiBuffer and return the new address of the merged MultiBuffer.

func ReadFrom 

func ReadFrom(reader io.Reader) (MultiBuffer, error)

ReadFrom reads all content from reader until EOF.

func ReleaseMulti 

func ReleaseMulti(mb MultiBuffer) MultiBuffer

ReleaseMulti release all content of the MultiBuffer, and returns an empty MultiBuffer.

func SplitBytes 

func SplitBytes(mb MultiBuffer, b []byte) (MultiBuffer, int)

SplitBytes splits the given amount of bytes from the beginning of the MultiBuffer. It returns the new address of MultiBuffer leftover, and number of bytes written into the input byte slice.

func SplitFirstBytes 

func SplitFirstBytes(mb MultiBuffer, p []byte) (MultiBuffer, int)

SplitFirstBytes splits the first buffer from MultiBuffer, and then copy its content into the given slice.

func WriteMultiBuffer 

func WriteMultiBuffer(writer io.Writer, mb MultiBuffer) (MultiBuffer, error)

WriteMultiBuffer writes all buffers from the MultiBuffer to the Writer one by one, and return error if any, with leftover MultiBuffer.

func (MultiBuffer) Copy 

func (mb MultiBuffer) Copy(b []byte) int

Copy copied the beginning part of the MultiBuffer into the given byte array.

func (MultiBuffer) IsEmpty 

func (mb MultiBuffer) IsEmpty() bool

IsEmpty return true if the MultiBuffer has no content.

func (MultiBuffer) Len 

func (mb MultiBuffer) Len() int32

Len returns the total number of bytes in the MultiBuffer.

func (MultiBuffer) String 

func (mb MultiBuffer) String() string

String returns the content of the MultiBuffer in string.

type MultiBufferContainer 

type MultiBufferContainer struct {
	MultiBuffer
}

MultiBufferContainer is a ReadWriteCloser wrapper over MultiBuffer.

func (*MultiBufferContainer) Close 

func (c *MultiBufferContainer) Close() error

Close implement io.Closer.

func (*MultiBufferContainer) Read 

func (c *MultiBufferContainer) Read(b []byte) (int, error)

Read implements io.Reader.

func (*MultiBufferContainer) ReadMultiBuffer 

func (c *MultiBufferContainer) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

func (*MultiBufferContainer) Write 

func (c *MultiBufferContainer) Write(b []byte) (int, error)

Write implements io.Writer.

func (*MultiBufferContainer) WriteMultiBuffer 

func (c *MultiBufferContainer) WriteMultiBuffer(b MultiBuffer) error

WriteMultiBuffer implement Writer.

type PacketReader 

type PacketReader struct {
	io.Reader
}

PacketReader is a Reader that read one Buffer every time.

func (*PacketReader) ReadMultiBuffer 

func (r *PacketReader) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

type ReadVReader 

type ReadVReader struct {
	io.Reader
	// contains filtered or unexported fields
}

ReadVReader is a Reader that uses readv(2) syscall to read data.

func NewReadVReader 

func NewReadVReader(reader io.Reader, rawConn syscall.RawConn) *ReadVReader

NewReadVReader creates a new ReadVReader.

func (*ReadVReader) ReadMultiBuffer 

func (r *ReadVReader) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

type Reader 

type Reader interface {
	// ReadMultiBuffer reads content from underlying reader, and put it into a MultiBuffer.
	ReadMultiBuffer() (MultiBuffer, error)
}

Reader extends io.Reader with MultiBuffer.

func NewPacketReader 

func NewPacketReader(reader io.Reader) Reader

NewPacketReader creates a new PacketReader based on the given reader.

func NewReader 

func NewReader(reader io.Reader) Reader

NewReader creates a new Reader. The Reader instance doesn't take the ownership of reader.

type SequentialWriter 

type SequentialWriter struct {
	io.Writer
}

SequentialWriter is a Writer that writes MultiBuffer sequentially into the underlying io.Writer.

func (*SequentialWriter) WriteMultiBuffer 

func (w *SequentialWriter) WriteMultiBuffer(mb MultiBuffer) error

WriteMultiBuffer implements Writer.

type SingleReader 

type SingleReader struct {
	io.Reader
}

SingleReader is a Reader that read one Buffer every time.

func (*SingleReader) ReadMultiBuffer 

func (r *SingleReader) ReadMultiBuffer() (MultiBuffer, error)

ReadMultiBuffer implements Reader.

type SizeCounter 

type SizeCounter struct {
	Size int64
}

SizeCounter is for counting bytes copied by Copy().

type TimeoutReader 

type TimeoutReader interface {
	ReadMultiBufferTimeout(time.Duration) (MultiBuffer, error)
}

TimeoutReader is a reader that returns error if Read() operation takes longer than the given timeout.

type Writer 

type Writer interface {
	// WriteMultiBuffer writes a MultiBuffer into underlying writer.
	WriteMultiBuffer(MultiBuffer) error
}

Writer extends io.Writer with MultiBuffer. 

var (
	// Discard is a Writer that swallows all contents written in.
	Discard Writer = noOpWriter(0)

	// DiscardBytes is an io.Writer that swallows all contents written in.
	DiscardBytes io.Writer = noOpWriter(0)
)

func NewWriter 

func NewWriter(writer io.Writer) Writer

NewWriter creates a new Writer.

Source Files

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