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watch.go
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/
watch.go
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package server
import (
"context"
"strings"
"github.com/coreos/etcd/clientv3"
"github.com/cybozu-go/cke"
)
func initStateless(ctx context.Context, etcd *clientv3.Client, ch chan<- struct{}) (int64, error) {
defer func() {
// notify the caller of the readiness
ch <- struct{}{}
}()
resp, err := etcd.Get(ctx, cke.KeyVault)
if err != nil {
return 0, err
}
rev := resp.Header.Revision
if resp.Count == 1 {
err = cke.ConnectVault(ctx, resp.Kvs[0].Value)
if err != nil {
return 0, err
}
}
return rev, nil
}
func startWatcher(ctx context.Context, etcd *clientv3.Client, ch chan<- struct{}) error {
rev, err := initStateless(ctx, etcd, ch)
if err != nil {
return err
}
wch := etcd.Watch(ctx, "", clientv3.WithPrefix(), clientv3.WithRev(rev+1))
for resp := range wch {
for _, ev := range resp.Events {
if ev.Type != clientv3.EventTypePut {
continue
}
key := string(ev.Kv.Key)
switch {
case key == cke.KeyCluster || strings.HasPrefix(key, cke.KeyResourcePrefix):
select {
case ch <- struct{}{}:
default:
}
case key == cke.KeyVault:
err = cke.ConnectVault(ctx, ev.Kv.Value)
if err != nil {
return err
}
}
}
}
return nil
}