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compressed.go
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compressed.go
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package storages
import (
"bytes"
"compress/gzip"
"io/ioutil"
)
// Compressed storage where values are compressed by gzip
func Compressed(storage Storage) Storage {
return &compressed{storage: storage}
}
type compressed struct {
storage Storage
}
func (cs *compressed) Put(key []byte, data []byte) error {
cdata, err := cs.packData(data)
if err != nil {
return err
}
return cs.storage.Put(key, cdata)
}
func (cs *compressed) Close() error {
return cs.storage.Close()
}
func (cs *compressed) Get(key []byte) ([]byte, error) {
cdata, err := cs.storage.Get(key)
if err != nil {
return nil, err
}
return cs.unpackData(cdata)
}
func (cs *compressed) Del(key []byte) error {
return cs.storage.Del(key)
}
func (cs *compressed) Keys(handler func(key []byte) error) error {
return cs.storage.Keys(handler)
}
func (cs *compressed) packData(data []byte) ([]byte, error) {
buf := &bytes.Buffer{}
writer := gzip.NewWriter(buf)
_, err := writer.Write(data)
if err != nil {
return nil, err
}
err = writer.Close()
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (cs *compressed) unpackData(cdata []byte) ([]byte, error) {
reader, err := gzip.NewReader(bytes.NewReader(cdata))
if err != nil {
return nil, err
}
return ioutil.ReadAll(reader)
}