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gob.go
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gob.go
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//
// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Package compress provides compress functions
package compress
import (
"bytes"
"encoding/gob"
"io"
"reflect"
"github.com/vdaas/vald/internal/errors"
)
type gobCompressor struct {
}
func NewGob(opts ...GobOption) (Compressor, error) {
c := new(gobCompressor)
for _, opt := range append(defaultGobOpts, opts...) {
if err := opt(c); err != nil {
return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
}
}
return c, nil
}
func (g *gobCompressor) CompressVector(vector []float32) ([]byte, error) {
buf := new(bytes.Buffer)
err := gob.NewEncoder(buf).Encode(vector)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (g *gobCompressor) DecompressVector(bs []byte) ([]float32, error) {
var vector []float32
err := gob.NewDecoder(bytes.NewBuffer(bs)).Decode(&vector)
if err != nil {
return nil, err
}
return vector, nil
}
func (g *gobCompressor) Reader(src io.ReadCloser) (io.ReadCloser, error) {
return &gobReader{
src: src,
decoder: gob.NewDecoder(src),
}, nil
}
func (g *gobCompressor) Writer(dst io.WriteCloser) (io.WriteCloser, error) {
return &gobWriter{
dst: dst,
encoder: gob.NewEncoder(dst),
}, nil
}
type gobReader struct {
src io.ReadCloser
decoder *gob.Decoder
}
func (gr *gobReader) Read(p []byte) (n int, err error) {
err = gr.decoder.Decode(&p)
if err != nil {
return 0, err
}
return len(p), nil
}
func (gr *gobReader) Close() error {
return gr.src.Close()
}
type gobWriter struct {
dst io.WriteCloser
encoder *gob.Encoder
}
func (gw *gobWriter) Write(p []byte) (n int, err error) {
err = gw.encoder.Encode(&p)
if err != nil {
return 0, err
}
return len(p), nil
}
func (gw *gobWriter) Close() error {
return gw.dst.Close()
}