blob: 2baefc8d6db14be2d21894b2a113ffde80b8faf8 (
plain)
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
|
package api
import (
"context"
"sync"
"time"
"github.com/eduvpn/eduvpn-common/internal/api/endpoints"
)
// EndpointCache is a struct that caches well-known API endpoints
type EndpointCache struct {
lastUpdate map[string]time.Time
lastEP map[string]*endpoints.Endpoints
mu sync.Mutex
}
// Get() returns a cached or fresh endpoint cache copy
func (ec *EndpointCache) Get(ctx context.Context, wk string) (*endpoints.Endpoints, error) {
ec.mu.Lock()
defer ec.mu.Unlock()
// get the last update time
lu := time.Time{}
if v, ok := ec.lastUpdate[wk]; ok {
lu = v
}
// if not 10 minutes have passed, return cached copy
if !lu.IsZero() && !time.Now().After(lu.Add(10*time.Minute)) {
v, ok := ec.lastEP[wk]
if ok {
return v, nil
}
}
// get fresh API endpoints
ep, err := getEndpoints(ctx, wk)
if err != nil {
return nil, err
}
// update endpoints
ec.lastUpdate[wk] = time.Now()
ec.lastEP[wk] = ep
return ep, nil
}
var (
epCache *EndpointCache
epCacheOnce sync.Once
)
func GetEndpointCache() *EndpointCache {
epCacheOnce.Do(func() {
epCache = &EndpointCache{
lastUpdate: make(map[string]time.Time),
lastEP: make(map[string]*endpoints.Endpoints),
}
})
return epCache
}
|
