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15 package recipe
16
17 import (
18 "context"
19
20 "go.etcd.io/etcd/api/v3/mvccpb"
21 "go.etcd.io/etcd/client/v3"
22 )
23
24
25 func WaitEvents(c *clientv3.Client, key string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
26 ctx, cancel := context.WithCancel(context.Background())
27 defer cancel()
28 wc := c.Watch(ctx, key, clientv3.WithRev(rev))
29 if wc == nil {
30 return nil, ErrNoWatcher
31 }
32 return waitEvents(wc, evs), nil
33 }
34
35 func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
36 ctx, cancel := context.WithCancel(context.Background())
37 defer cancel()
38 wc := c.Watch(ctx, prefix, clientv3.WithPrefix(), clientv3.WithRev(rev))
39 if wc == nil {
40 return nil, ErrNoWatcher
41 }
42 return waitEvents(wc, evs), nil
43 }
44
45 func waitEvents(wc clientv3.WatchChan, evs []mvccpb.Event_EventType) *clientv3.Event {
46 i := 0
47 for wresp := range wc {
48 for _, ev := range wresp.Events {
49 if ev.Type == evs[i] {
50 i++
51 if i == len(evs) {
52 return ev
53 }
54 }
55 }
56 }
57 return nil
58 }
59
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