-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
registry.go
114 lines (96 loc) · 2.67 KB
/
registry.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
package metrics
import (
"fmt"
"regexp"
"sync"
"github.com/mstoykov/atlas"
)
// Registry is what can create metrics
type Registry struct {
metrics map[string]*Metric
l sync.RWMutex
rootTagSet *atlas.Node
}
// NewRegistry returns a new registry
func NewRegistry() *Registry {
return &Registry{
metrics: make(map[string]*Metric),
// All the new TagSts must branch out from this root, otherwise
// comparing them and using their Equals() method won't work correctly.
rootTagSet: atlas.New(),
}
}
const nameRegexString = "^[\\p{L}\\p{N}\\._ !\\?/&#\\(\\)<>%-]{1,128}$"
var compileNameRegex = regexp.MustCompile(nameRegexString)
func checkName(name string) bool {
return compileNameRegex.Match([]byte(name))
}
// NewMetric returns new metric registered to this registry
// TODO have multiple versions returning specific metric types when we have such things
func (r *Registry) NewMetric(name string, typ MetricType, t ...ValueType) (*Metric, error) {
r.l.Lock()
defer r.l.Unlock()
if !checkName(name) {
return nil, fmt.Errorf("Invalid metric name: '%s'", name) //nolint:golint,stylecheck
}
oldMetric, ok := r.metrics[name]
if !ok {
m := r.newMetric(name, typ, t...)
r.metrics[name] = m
return m, nil
}
if oldMetric.Type != typ {
return nil, fmt.Errorf("metric '%s' already exists but with type %s, instead of %s", name, oldMetric.Type, typ)
}
if len(t) > 0 {
if t[0] != oldMetric.Contains {
return nil, fmt.Errorf("metric '%s' already exists but with a value type %s, instead of %s",
name, oldMetric.Contains, t[0])
}
}
return oldMetric, nil
}
// MustNewMetric is like NewMetric, but will panic if there is an error
func (r *Registry) MustNewMetric(name string, typ MetricType, t ...ValueType) *Metric {
m, err := r.NewMetric(name, typ, t...)
if err != nil {
panic(err)
}
return m
}
// All returns all the registered metrics.
func (r *Registry) All() []*Metric {
r.l.RLock()
defer r.l.RUnlock()
if len(r.metrics) < 1 {
return nil
}
s := make([]*Metric, 0, len(r.metrics))
for _, m := range r.metrics {
s = append(s, m)
}
return s
}
func (r *Registry) newMetric(name string, mt MetricType, vt ...ValueType) *Metric {
valueType := Default
if len(vt) > 0 {
valueType = vt[0]
}
sink := NewSink(mt)
return &Metric{
registry: r,
Name: name,
Type: mt,
Contains: valueType,
Sink: sink,
}
}
// Get returns the Metric with the given name. If that metric doesn't exist,
// Get() will return a nil value.
func (r *Registry) Get(name string) *Metric {
return r.metrics[name]
}
// RootTagSet is the empty root set that all other TagSets must originate from.
func (r *Registry) RootTagSet() *TagSet {
return (*TagSet)(r.rootTagSet)
}