61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
// Copyright 2019 The OpenZipkin Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package model
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import (
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"encoding/json"
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"errors"
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"time"
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)
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// ErrValidTimestampRequired error
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var ErrValidTimestampRequired = errors.New("valid annotation timestamp required")
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// Annotation associates an event that explains latency with a timestamp.
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type Annotation struct {
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Timestamp time.Time
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Value string
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}
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// MarshalJSON implements custom JSON encoding
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func (a *Annotation) MarshalJSON() ([]byte, error) {
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return json.Marshal(&struct {
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Timestamp int64 `json:"timestamp"`
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Value string `json:"value"`
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}{
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Timestamp: a.Timestamp.Round(time.Microsecond).UnixNano() / 1e3,
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Value: a.Value,
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})
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}
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// UnmarshalJSON implements custom JSON decoding
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func (a *Annotation) UnmarshalJSON(b []byte) error {
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type Alias Annotation
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annotation := &struct {
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TimeStamp uint64 `json:"timestamp"`
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*Alias
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}{
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Alias: (*Alias)(a),
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}
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if err := json.Unmarshal(b, &annotation); err != nil {
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return err
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}
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if annotation.TimeStamp < 1 {
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return ErrValidTimestampRequired
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}
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a.Timestamp = time.Unix(0, int64(annotation.TimeStamp)*1e3)
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return nil
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}
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