/
snappy.go
88 lines (74 loc) · 2.16 KB
/
snappy.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
// Copyright (c) 2022 Palantir Technologies. All rights reserved.
//
// 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
//
// http://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 codecs
import (
"bytes"
"io"
"github.com/golang/snappy"
werror "github.com/palantir/witchcraft-go-error"
)
var _ Codec = codecSNAPPY{}
// Snappy wraps an existing Codec and uses snappy with no-framing for
// compression and decompression using github.com/golang/snappy.
// Ref: https://github.com/google/snappy/blob/main/format_description.txt
func Snappy(codec Codec) Codec {
return &codecSNAPPY{contentCodec: codec}
}
type codecSNAPPY struct {
contentCodec Codec
}
func (c codecSNAPPY) Accept() string {
return c.contentCodec.Accept()
}
func (c codecSNAPPY) Decode(r io.Reader, v interface{}) error {
data, err := io.ReadAll(r)
if err != nil {
return err
}
decoded, err := snappy.Decode(nil, data)
if err != nil {
return err
}
return c.contentCodec.Decode(bytes.NewReader(decoded), v)
}
func (c codecSNAPPY) Unmarshal(data []byte, v interface{}) error {
decoded, err := snappy.Decode(nil, data)
if err != nil {
return err
}
return c.contentCodec.Unmarshal(decoded, v)
}
func (c codecSNAPPY) ContentType() string {
return c.contentCodec.ContentType()
}
func (c codecSNAPPY) Encode(w io.Writer, v interface{}) error {
data, err := c.contentCodec.Marshal(v)
if err != nil {
return err
}
encoded, err := c.Marshal(data)
if err != nil {
return err
}
_, err = w.Write(encoded)
return err
}
func (c codecSNAPPY) Marshal(v interface{}) ([]byte, error) {
data, ok := v.([]byte)
if !ok {
return nil, werror.Error("failed to compress data from type which is not of type []byte")
}
d := snappy.Encode(nil, data)
return d, nil
}