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
|
// Copyright 2022 The OpenZipkin Authors
//
// 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 model
import (
"encoding/json"
"errors"
"time"
)
// ErrValidTimestampRequired error
var ErrValidTimestampRequired = errors.New("valid annotation timestamp required")
// Annotation associates an event that explains latency with a timestamp.
type Annotation struct {
Timestamp time.Time
Value string
}
// MarshalJSON implements custom JSON encoding
func (a *Annotation) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
Timestamp int64 `json:"timestamp"`
Value string `json:"value"`
}{
Timestamp: a.Timestamp.Round(time.Microsecond).UnixNano() / 1e3,
Value: a.Value,
})
}
// UnmarshalJSON implements custom JSON decoding
func (a *Annotation) UnmarshalJSON(b []byte) error {
type Alias Annotation
annotation := &struct {
TimeStamp uint64 `json:"timestamp"`
*Alias
}{
Alias: (*Alias)(a),
}
if err := json.Unmarshal(b, &annotation); err != nil {
return err
}
if annotation.TimeStamp < 1 {
return ErrValidTimestampRequired
}
a.Timestamp = time.Unix(0, int64(annotation.TimeStamp)*1e3)
return nil
}
|
