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pool.go
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pool.go
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package chunkenc
import (
"bufio"
"bytes"
"io"
"sync"
"github.com/golang/snappy"
"github.com/klauspost/compress/gzip"
"github.com/pierrec/lz4/v4"
"github.com/prometheus/prometheus/pkg/pool"
)
// WriterPool is a pool of io.Writer
// This is used by every chunk to avoid unnecessary allocations.
type WriterPool interface {
GetWriter(io.Writer) io.WriteCloser
PutWriter(io.WriteCloser)
}
// ReaderPool similar to WriterPool but for reading chunks.
type ReaderPool interface {
GetReader(io.Reader) io.Reader
PutReader(io.Reader)
}
var (
// Gzip is the gnu zip compression pool
Gzip = GzipPool{level: gzip.DefaultCompression}
Lz4_64k = LZ4Pool{bufferSize: 1 << 16} // Lz4_64k is the l4z compression pool, with 64k buffer size
Lz4_256k = LZ4Pool{bufferSize: 1 << 18} // Lz4_256k uses 256k buffer
Lz4_1M = LZ4Pool{bufferSize: 1 << 20} // Lz4_1M uses 1M buffer
Lz4_4M = LZ4Pool{bufferSize: 1 << 22} // Lz4_4M uses 4M buffer
// Snappy is the snappy compression pool
Snappy SnappyPool
// Noop is the no compression pool
Noop NoopPool
// BufReaderPool is bufio.Reader pool
BufReaderPool = &BufioReaderPool{
pool: sync.Pool{
New: func() interface{} { return bufio.NewReader(nil) },
},
}
// BytesBufferPool is a bytes buffer used for lines decompressed.
// Buckets [0.5KB,1KB,2KB,4KB,8KB]
BytesBufferPool = pool.New(1<<9, 1<<13, 2, func(size int) interface{} { return make([]byte, 0, size) })
serializeBytesBufferPool = sync.Pool{
New: func() interface{} {
return &bytes.Buffer{}
},
}
)
func getWriterPool(enc Encoding) WriterPool {
return getReaderPool(enc).(WriterPool)
}
func getReaderPool(enc Encoding) ReaderPool {
switch enc {
case EncGZIP:
return &Gzip
case EncLZ4_64k:
return &Lz4_64k
case EncLZ4_256k:
return &Lz4_256k
case EncLZ4_1M:
return &Lz4_1M
case EncLZ4_4M:
return &Lz4_4M
case EncSnappy:
return &Snappy
case EncNone:
return &Noop
default:
panic("unknown encoding")
}
}
// GzipPool is a gun zip compression pool
type GzipPool struct {
readers sync.Pool
writers sync.Pool
level int
}
// GetReader gets or creates a new CompressionReader and reset it to read from src
func (pool *GzipPool) GetReader(src io.Reader) io.Reader {
if r := pool.readers.Get(); r != nil {
reader := r.(*gzip.Reader)
err := reader.Reset(src)
if err != nil {
panic(err)
}
return reader
}
reader, err := gzip.NewReader(src)
if err != nil {
panic(err)
}
return reader
}
// PutReader places back in the pool a CompressionReader
func (pool *GzipPool) PutReader(reader io.Reader) {
pool.readers.Put(reader)
}
// GetWriter gets or creates a new CompressionWriter and reset it to write to dst
func (pool *GzipPool) GetWriter(dst io.Writer) io.WriteCloser {
if w := pool.writers.Get(); w != nil {
writer := w.(*gzip.Writer)
writer.Reset(dst)
return writer
}
level := pool.level
if level == 0 {
level = gzip.DefaultCompression
}
w, err := gzip.NewWriterLevel(dst, level)
if err != nil {
panic(err) // never happens, error is only returned on wrong compression level.
}
return w
}
// PutWriter places back in the pool a CompressionWriter
func (pool *GzipPool) PutWriter(writer io.WriteCloser) {
pool.writers.Put(writer)
}
type LZ4Pool struct {
readers sync.Pool
writers sync.Pool
bufferSize uint32 // available values: 1<<16 (64k), 1<<18 (256k), 1<<20 (1M), 1<<22 (4M). Defaults to 4MB, if not set.
}
// GetReader gets or creates a new CompressionReader and reset it to read from src
func (pool *LZ4Pool) GetReader(src io.Reader) io.Reader {
var r *lz4.Reader
if pooled := pool.readers.Get(); pooled != nil {
r = pooled.(*lz4.Reader)
r.Reset(src)
} else {
r = lz4.NewReader(src)
}
return r
}
// PutReader places back in the pool a CompressionReader
func (pool *LZ4Pool) PutReader(reader io.Reader) {
pool.readers.Put(reader)
}
// GetWriter gets or creates a new CompressionWriter and reset it to write to dst
func (pool *LZ4Pool) GetWriter(dst io.Writer) io.WriteCloser {
var w *lz4.Writer
if fromPool := pool.writers.Get(); fromPool != nil {
w = fromPool.(*lz4.Writer)
w.Reset(dst)
} else {
w = lz4.NewWriter(dst)
}
err := w.Apply(
lz4.ChecksumOption(false),
lz4.BlockSizeOption(lz4.BlockSize(pool.bufferSize)),
lz4.CompressionLevelOption(lz4.Fast),
)
if err != nil {
panic(err)
}
return w
}
// PutWriter places back in the pool a CompressionWriter
func (pool *LZ4Pool) PutWriter(writer io.WriteCloser) {
pool.writers.Put(writer)
}
type SnappyPool struct {
readers sync.Pool
writers sync.Pool
}
// GetReader gets or creates a new CompressionReader and reset it to read from src
func (pool *SnappyPool) GetReader(src io.Reader) io.Reader {
if r := pool.readers.Get(); r != nil {
reader := r.(*snappy.Reader)
reader.Reset(src)
return reader
}
return snappy.NewReader(src)
}
// PutReader places back in the pool a CompressionReader
func (pool *SnappyPool) PutReader(reader io.Reader) {
pool.readers.Put(reader)
}
// GetWriter gets or creates a new CompressionWriter and reset it to write to dst
func (pool *SnappyPool) GetWriter(dst io.Writer) io.WriteCloser {
if w := pool.writers.Get(); w != nil {
writer := w.(*snappy.Writer)
writer.Reset(dst)
return writer
}
return snappy.NewBufferedWriter(dst)
}
// PutWriter places back in the pool a CompressionWriter
func (pool *SnappyPool) PutWriter(writer io.WriteCloser) {
pool.writers.Put(writer)
}
type NoopPool struct{}
// GetReader gets or creates a new CompressionReader and reset it to read from src
func (pool *NoopPool) GetReader(src io.Reader) io.Reader {
return src
}
// PutReader places back in the pool a CompressionReader
func (pool *NoopPool) PutReader(reader io.Reader) {}
type noopCloser struct {
io.Writer
}
func (noopCloser) Close() error { return nil }
// GetWriter gets or creates a new CompressionWriter and reset it to write to dst
func (pool *NoopPool) GetWriter(dst io.Writer) io.WriteCloser {
return noopCloser{dst}
}
// PutWriter places back in the pool a CompressionWriter
func (pool *NoopPool) PutWriter(writer io.WriteCloser) {}
// BufioReaderPool is a bufio reader that uses sync.Pool.
type BufioReaderPool struct {
pool sync.Pool
}
// Get returns a bufio.Reader which reads from r. The buffer size is that of the pool.
func (bufPool *BufioReaderPool) Get(r io.Reader) *bufio.Reader {
buf := bufPool.pool.Get().(*bufio.Reader)
if buf == nil {
return bufio.NewReaderSize(r, 4*1024)
}
buf.Reset(r)
return buf
}
// Put puts the bufio.Reader back into the pool.
func (bufPool *BufioReaderPool) Put(b *bufio.Reader) {
bufPool.pool.Put(b)
}