-
Notifications
You must be signed in to change notification settings - Fork 28
/
tracker.go
61 lines (53 loc) · 1.79 KB
/
tracker.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
// Copyright 2024 The Carvel Authors.
// SPDX-License-Identifier: Apache-2.0
// Package tracker allows "tracking" resources to monitor "tracked" resources.
// All "tracking" resources can then be found for a given "tracked" resource.
// Tracker is thread-safe.
package tracker
import (
"sync"
"k8s.io/apimachinery/pkg/types"
)
// Tracker allows "tracking" resources to monitor "tracked" resources.
// All "tracking" resources can then be found for a given "tracked" resource.
// Tracker is thread-safe.
type Tracker struct {
// Holds a set of resources(tracking) to set of resources(tracked)
tracker map[types.NamespacedName]map[types.NamespacedName]struct{}
mu sync.RWMutex
}
// NewTracker creates a new Tracker
func NewTracker() *Tracker {
return &Tracker{tracker: map[types.NamespacedName]map[types.NamespacedName]struct{}{}}
}
// Track records that the tracking object is interested in all tracked objects
func (s *Tracker) Track(tracking types.NamespacedName, tracked ...types.NamespacedName) {
s.mu.Lock()
defer s.mu.Unlock()
set, found := s.tracker[tracking]
if !found {
set = map[types.NamespacedName]struct{}{}
s.tracker[tracking] = set
}
for _, t := range tracked {
set[t] = struct{}{}
}
}
// UntrackAll untracks all tracking objects. This method is idempotent
func (s *Tracker) UntrackAll(tracking types.NamespacedName) {
s.mu.Lock()
defer s.mu.Unlock()
delete(s.tracker, tracking)
}
// GetTracking returns all tracking objects for a given tracked object
func (s *Tracker) GetTracking(tracked types.NamespacedName) []types.NamespacedName {
s.mu.RLock()
defer s.mu.RUnlock()
trackingList := []types.NamespacedName{}
for tracking, trackedSet := range s.tracker {
if _, found := trackedSet[tracked]; found {
trackingList = append(trackingList, tracking)
}
}
return trackingList
}