buf

package
v2.21.3+incompatible Latest Latest
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 Go to latest Published: Apr 5, 2017 License: MIT Imports: 8 Imported by: 0

Documentation

Overview

Package buf provides a light-weight memory allocation mechanism.

Index

Constants

View Source 
const (
	// Size of a regular buffer.
	Size = 8 * 1024
	// SizeSmall is the size of a small buffer.
	SizeSmall = 2 * 1024
)

Variables

View Source 
var ErrReadTimeout = errors.New("Buf: IO timeout.")

Functions

func Pipe 

func Pipe(timer signal.ActivityTimer, reader Reader, writer Writer) error

Pipe dumps all payload from reader to writer, until an error occurs. ActivityTimer gets updated as soon as there is a payload.

func PipeUntilEOF 

func PipeUntilEOF(timer signal.ActivityTimer, reader Reader, writer Writer) error

PipeUntilEOF behaves the same as Pipe(). The only difference is PipeUntilEOF returns nil on EOF.

func ToBytesReader 

func ToBytesReader(stream Reader) io.Reader

ToBytesReader converts a Reaaer to io.Reader.

func ToBytesWriter 

func ToBytesWriter(writer Writer) io.Writer

ToBytesWriter converts a Writer to io.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 8K capacity.

func NewLocal 

func NewLocal(size int) *Buffer

NewLocal creates and returns a buffer with 0 length and given capacity on current thread.

func NewSmall 

func NewSmall() *Buffer

NewSmall returns a buffer with 0 length and 2K capacity.

func (*Buffer) Append 

func (b *Buffer) Append(data []byte) int

Append appends a byte array to the end of the buffer.

func (*Buffer) AppendBytes 

func (b *Buffer) AppendBytes(bytes ...byte) int

AppendBytes appends one or more bytes to the end of the buffer.

func (*Buffer) AppendSupplier 

func (b *Buffer) AppendSupplier(writer Supplier) error

AppendSupplier appends the content of a BytesWriter to the buffer.

func (*Buffer) Byte 

func (b *Buffer) Byte(index int) 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 int) []byte

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

func (*Buffer) BytesRange 

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

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

func (*Buffer) BytesTo 

func (b *Buffer) BytesTo(to int) []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) 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() int

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) Release 

func (b *Buffer) Release()

Release recycles the buffer into an internal buffer pool.

func (*Buffer) Reset 

func (b *Buffer) Reset(writer Supplier) error

Reset resets the content of the Buffer with a supplier.

func (*Buffer) SetByte 

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

SetByte sets the byte value at index.

func (*Buffer) Slice 

func (b *Buffer) Slice(from, to int)

Slice cuts the buffer at the given position.

func (*Buffer) SliceFrom 

func (b *Buffer) SliceFrom(from int)

SliceFrom cuts the buffer at the given position.

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.

type BufferPool 

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

BufferPool is a Pool that utilizes an internal cache.

func NewBufferPool 

func NewBufferPool(bufferSize, poolSize uint32) *BufferPool

NewBufferPool creates a new BufferPool with given buffer size, and internal cache size.

func (*BufferPool) Allocate 

func (p *BufferPool) Allocate() *Buffer

Allocate implements Pool.Allocate().

func (*BufferPool) Free 

func (p *BufferPool) Free(buffer *Buffer)

Free implements Pool.Free().

type BufferToBytesWriter 

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

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

func (*BufferToBytesWriter) Write 

func (v *BufferToBytesWriter) Write(buffer *Buffer) error

Write implements Writer.Write(). Write() takes ownership of the given buffer.

type BufferedReader 

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

BufferedReader is a reader with internal cache.

func NewBufferedReader 

func NewBufferedReader(rawReader io.Reader) *BufferedReader

NewBufferedReader creates a new BufferedReader based on an io.Reader.

func (*BufferedReader) IsBuffered 

func (v *BufferedReader) IsBuffered() bool

IsBuffered returns true if the internal cache is effective.

func (*BufferedReader) Read 

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

Read implements io.Reader.Read().

func (*BufferedReader) SetBuffered 

func (v *BufferedReader) SetBuffered(cached bool)

SetBuffered is to enable or disable internal cache. If cache is disabled, Read() calls will be delegated to the underlying io.Reader directly.

type BufferedWriter 

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

BufferedWriter is an io.Writer with internal buffer. It writes to underlying writer when buffer is full or on demand. This type is not thread safe.

func NewBufferedWriter 

func NewBufferedWriter(rawWriter io.Writer) *BufferedWriter

NewBufferedWriter creates a new BufferedWriter.

func (*BufferedWriter) Flush 

func (v *BufferedWriter) Flush() error

Flush writes all buffered content into underlying writer, if any.

func (*BufferedWriter) IsBuffered 

func (v *BufferedWriter) IsBuffered() bool

IsBuffered returns true if this BufferedWriter holds a buffer.

func (*BufferedWriter) ReadFrom 

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

ReadFrom implements io.ReaderFrom.ReadFrom().

func (*BufferedWriter) SetBuffered 

func (v *BufferedWriter) SetBuffered(cached bool) error

SetBuffered controls whether the BufferedWriter holds a buffer for writing. If not buffered, any write() calls into underlying writer directly.

func (*BufferedWriter) Write 

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

type BytesToBufferReader 

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

BytesToBufferReader is a Reader that adjusts its reading speed automatically.

func (*BytesToBufferReader) Read 

func (v *BytesToBufferReader) Read() (*Buffer, error)

Read implements Reader.Read().

type MergingReader 

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

func (*MergingReader) Read 

func (r *MergingReader) Read() (*Buffer, error)

type Pool 

type Pool interface {
	// Allocate either returns a unused buffer from the pool, or generates a new one from system.
	Allocate() *Buffer
	// Free recycles the given buffer.
	Free(*Buffer)
}

Pool provides functionality to generate and recycle buffers on demand.

type Reader 

type Reader interface {
	// Read reads content from underlying reader, and put it into an alloc.Buffer.
	Read() (*Buffer, error)
}

Reader extends io.Reader with alloc.Buffer.

func NewMergingReader 

func NewMergingReader(reader Reader) 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 Supplier 

type Supplier func([]byte) (int, error)

Supplier is a writer that writes contents into the given buffer.

func ReadFrom 

func ReadFrom(reader io.Reader) Supplier

ReadFrom creates a Supplier to read from a given io.Reader.

func ReadFullFrom 

func ReadFullFrom(reader io.Reader, size int) Supplier

ReadFullFrom creates a Supplier to read full buffer from a given io.Reader.

type SyncPool 

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

SyncPool is a buffer pool based on sync.Pool

func NewSyncPool 

func NewSyncPool(bufferSize uint32) *SyncPool

NewSyncPool creates a SyncPool with given buffer size.

func (*SyncPool) Allocate 

func (p *SyncPool) Allocate() *Buffer

Allocate implements Pool.Allocate().

func (*SyncPool) Free 

func (p *SyncPool) Free(buffer *Buffer)

Free implements Pool.Free().

type TimeoutReader 

type TimeoutReader interface {
	ReadTimeout(time.Duration) (*Buffer, error)
}

type Writer 

type Writer interface {
	// Write writes an alloc.Buffer into underlying writer.
	Write(*Buffer) error
}

Writer extends io.Writer with alloc.Buffer.

func NewWriter 

func NewWriter(writer io.Writer) Writer

NewWriter creates a new Writer.

Source Files

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