This repository has been archived by the owner on Sep 6, 2022. It is now read-only.
/
register.go
70 lines (58 loc) · 1.78 KB
/
register.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
package metrics
import (
"fmt"
"sync"
"go.opencensus.io/stats/view"
)
var registeredViews = map[string][]*view.View{}
var mu = new(sync.Mutex)
type ErrNamespace struct {
Namespace string
}
// ErrUnregisteredNamespace is an error for lookup of requested unregistered Namespace
type ErrUnregisteredNamespace ErrNamespace
func (e ErrUnregisteredNamespace) Error() string {
return fmt.Sprintf("no views found registered under Namespace %s", e.Namespace)
}
// ErrDuplicateNamespaceRegistration is an error for a Namespace that has already
// registered views
type ErrDuplicateNamespaceRegistration ErrNamespace
func (e ErrDuplicateNamespaceRegistration) Error() string {
return fmt.Sprintf("duplicate registration of views by Namespace %s", e.Namespace)
}
// RegisterViews accepts a namespace and a slice of Views, which will be registered
// with opencensus and maintained in the global registered views map
func RegisterViews(namespace string, views ...*view.View) error {
mu.Lock()
defer mu.Unlock()
_, ok := registeredViews[namespace]
if ok {
return ErrDuplicateNamespaceRegistration{Namespace: namespace}
} else {
registeredViews[namespace] = views
}
return nil
}
// LookupViews returns all views for a Namespace name. Returns an error if the
// Namespace has not been registered.
func LookupViews(name string) ([]*view.View, error) {
mu.Lock()
defer mu.Unlock()
views, ok := registeredViews[name]
if !ok {
return nil, ErrUnregisteredNamespace{Namespace: name}
}
response := make([]*view.View, len(views))
copy(response, views)
return response, nil
}
// AllViews returns all registered views as a single slice
func AllViews() []*view.View {
var views []*view.View
mu.Lock()
defer mu.Unlock()
for _, vs := range registeredViews {
views = append(views, vs...)
}
return views
}