-
Notifications
You must be signed in to change notification settings - Fork 126
/
metrics.go
77 lines (67 loc) · 1.93 KB
/
metrics.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
// Copyright (c) 2019 Cisco and/or its affiliates.
//
// 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 metrics
import (
"encoding/json"
"math"
"sort"
"time"
)
// RoundDuration is the default value used for rounding durations.
var RoundDuration = time.Millisecond * 1
type Calls map[string]*CallStats
func (m Calls) Copy() Calls {
calls := make(Calls)
for k, s := range m {
copy := *s
calls[k] = ©
}
return calls
}
// MarshalJSON implements json.Marshaler interface
func (m Calls) MarshalJSON() ([]byte, error) {
calls := make([]*CallStats, 0, len(m))
for _, s := range m {
calls = append(calls, s)
}
sort.Slice(calls, func(i, j int) bool {
return calls[i].Count > calls[j].Count
})
return json.Marshal(calls)
}
// CallStats represents generic stats for call metrics.
type CallStats struct {
Name string `json:"name,omitempty"`
Count uint64 `json:"count"`
Total float64 `json:"total,omitempty"`
Avg float64 `json:"avg,omitempty"`
Min float64 `json:"min,omitempty"`
Max float64 `json:"max,omitempty"`
}
// Increment increments call count and recalculates durations
func (m *CallStats) Increment(d time.Duration) {
took := d.Round(RoundDuration).Seconds()
m.Count++
m.Total = round(m.Total + took)
m.Avg = round(m.Total / float64(m.Count))
if took > m.Max {
m.Max = took
}
if m.Min == 0 || took < m.Min {
m.Min = took
}
}
func round(n float64) float64 {
return math.Round(n*1000) / 1000
}