/
checkpoint.go
121 lines (104 loc) · 3.11 KB
/
checkpoint.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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
// Copyright © 2020 Attestant Limited.
// 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 phase0
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/goccy/go-yaml"
"github.com/pkg/errors"
)
// Checkpoint provides information about a checkpoint.
type Checkpoint struct {
Epoch Epoch
Root Root `ssz-size:"32"`
}
// checkpointJSON is an internal representation of the struct.
type checkpointJSON struct {
Epoch string `json:"epoch"`
Root string `json:"root"`
}
// checkpointYAML is an internal representation of the struct.
type checkpointYAML struct {
Epoch uint64 `yaml:"epoch"`
Root string `yaml:"root"`
}
// MarshalJSON implements json.Marshaler.
func (c *Checkpoint) MarshalJSON() ([]byte, error) {
return json.Marshal(&checkpointJSON{
Epoch: fmt.Sprintf("%d", c.Epoch),
Root: fmt.Sprintf("%#x", c.Root),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (c *Checkpoint) UnmarshalJSON(input []byte) error {
var checkpointJSON checkpointJSON
err := json.Unmarshal(input, &checkpointJSON)
if err != nil {
return errors.Wrap(err, "invalid JSON")
}
return c.unpack(&checkpointJSON)
}
func (c *Checkpoint) unpack(checkpointJSON *checkpointJSON) error {
if checkpointJSON.Epoch == "" {
return errors.New("epoch missing")
}
epoch, err := strconv.ParseUint(checkpointJSON.Epoch, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for epoch")
}
c.Epoch = Epoch(epoch)
if checkpointJSON.Root == "" {
return errors.New("root missing")
}
root, err := hex.DecodeString(strings.TrimPrefix(checkpointJSON.Root, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for root")
}
if len(root) != RootLength {
return errors.New("incorrect length for root")
}
copy(c.Root[:], root)
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (c *Checkpoint) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&checkpointYAML{
Epoch: uint64(c.Epoch),
Root: fmt.Sprintf("%#x", c.Root),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (c *Checkpoint) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var checkpointJSON checkpointJSON
if err := yaml.Unmarshal(input, &checkpointJSON); err != nil {
return err
}
return c.unpack(&checkpointJSON)
}
// String returns a string version of the structure.
func (c *Checkpoint) String() string {
data, err := yaml.Marshal(c)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}