mirror of https://github.com/v2ray/v2ray-core
126 lines
2.5 KiB
Go
126 lines
2.5 KiB
Go
package buf
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import (
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"os"
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"strconv"
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"sync"
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)
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// Pool provides functionality to generate and recycle buffers on demand.
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type Pool interface {
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// Allocate either returns a unused buffer from the pool, or generates a new one from system.
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Allocate() *Buffer
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// Free recycles the given buffer.
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Free(*Buffer)
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}
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// SyncPool is a buffer pool based on sync.Pool
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type SyncPool struct {
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allocator *sync.Pool
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}
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// NewSyncPool creates a SyncPool with given buffer size.
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func NewSyncPool(bufferSize uint32) *SyncPool {
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pool := &SyncPool{
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allocator: &sync.Pool{
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New: func() interface{} { return make([]byte, bufferSize) },
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},
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}
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return pool
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}
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// Allocate implements Pool.Allocate().
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func (p *SyncPool) Allocate() *Buffer {
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return &Buffer{
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v: p.allocator.Get().([]byte),
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pool: p,
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}
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}
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// Free implements Pool.Free().
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func (p *SyncPool) Free(buffer *Buffer) {
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rawBuffer := buffer.v
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if rawBuffer == nil {
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return
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}
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p.allocator.Put(rawBuffer)
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}
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// BufferPool is a Pool that utilizes an internal cache.
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type BufferPool struct {
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chain chan []byte
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allocator *sync.Pool
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}
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// NewBufferPool creates a new BufferPool with given buffer size, and internal cache size.
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func NewBufferPool(bufferSize, poolSize uint32) *BufferPool {
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pool := &BufferPool{
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chain: make(chan []byte, poolSize),
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allocator: &sync.Pool{
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New: func() interface{} { return make([]byte, bufferSize) },
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},
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}
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for i := uint32(0); i < poolSize; i++ {
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pool.chain <- make([]byte, bufferSize)
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}
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return pool
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}
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// Allocate implements Pool.Allocate().
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func (p *BufferPool) Allocate() *Buffer {
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var b []byte
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select {
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case b = <-p.chain:
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default:
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b = p.allocator.Get().([]byte)
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}
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return &Buffer{
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v: b,
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pool: p,
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}
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}
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// Free implements Pool.Free().
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func (p *BufferPool) Free(buffer *Buffer) {
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rawBuffer := buffer.v
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if rawBuffer == nil {
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return
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}
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select {
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case p.chain <- rawBuffer:
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default:
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p.allocator.Put(rawBuffer)
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}
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}
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const (
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// Size of a regular buffer.
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Size = 8 * 1024
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// SizeSmall is the size of a small buffer.
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SizeSmall = 2 * 1024
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poolSizeEnvKey = "v2ray.buffer.size"
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)
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var (
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mediumPool Pool
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smallPool = NewSyncPool(SizeSmall)
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)
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func init() {
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var size uint32 = 20
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sizeStr := os.Getenv(poolSizeEnvKey)
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if len(sizeStr) > 0 {
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customSize, err := strconv.ParseUint(sizeStr, 10, 32)
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if err == nil {
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size = uint32(customSize)
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}
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}
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if size > 0 {
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totalByteSize := size * 1024 * 1024
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mediumPool = NewBufferPool(Size, totalByteSize/Size)
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} else {
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mediumPool = NewSyncPool(Size)
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}
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}
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