/
gzip.go
54 lines (47 loc) · 1.28 KB
/
gzip.go
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package pool
import (
"compress/gzip"
"io"
"sync"
)
var Gzip GzipPool
// GzipPool manages a pool of gzip.Writer.
// The pool uses sync.Pool internally.
type GzipPool struct {
readers sync.Pool
writers sync.Pool
}
// GetReader returns gzip.Reader from the pool, or creates a new one
// if the pool is empty.
func (pool *GzipPool) GetReader(src io.Reader) (reader *gzip.Reader) {
if r := pool.readers.Get(); r != nil {
reader = r.(*gzip.Reader)
reader.Reset(src)
} else {
reader, _ = gzip.NewReader(src)
}
return reader
}
// PutReader closes and returns a gzip.Reader to the pool
// so that it can be reused via GetReader.
func (pool *GzipPool) PutReader(reader *gzip.Reader) {
reader.Close()
pool.readers.Put(reader)
}
// GetWriter returns gzip.Writer from the pool, or creates a new one
// with gzip.BestCompression if the pool is empty.
func (pool *GzipPool) GetWriter(dst io.Writer) (writer *gzip.Writer) {
if w := pool.writers.Get(); w != nil {
writer = w.(*gzip.Writer)
writer.Reset(dst)
} else {
writer, _ = gzip.NewWriterLevel(dst, gzip.BestCompression)
}
return writer
}
// PutWriter closes and returns a gzip.Writer to the pool
// so that it can be reused via GetWriter.
func (pool *GzipPool) PutWriter(writer *gzip.Writer) {
writer.Close()
pool.writers.Put(writer)
}