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client: ensure the right leader is picked in watcher results for campaign and observe impls.

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Signed-off-by: Cristian Ferretti <jcferretti2020@gmail.com>
This commit is contained in:
Cristian Ferretti 2024-06-13 14:05:56 -04:00
parent 260dd77ed4
commit 7e419db4f3
1 changed files with 8 additions and 6 deletions
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6
client/v3/concurrency/election.go
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@ -73,7 +73,7 @@ func (e *Election) Campaign(ctx context.Context, val string) error {
k := fmt.Sprintf("%s%x", e.keyPrefix, s.Lease())
txn := client.Txn(ctx).If(v3.Compare(v3.CreateRevision(k), "=", 0))
txn = txn.Then(v3.OpPut(k, val, v3.WithLease(s.Lease())))
txn = txn.Else(v3.OpGet(k))
txn = txn.Else(v3.OpGet(k, v3.WithFirstCreate()...))
resp, err := txn.Commit()
if err != nil {
return err
@ -195,13 +195,15 @@ func (e *Election) observe(ctx context.Context, ch chan<- v3.GetResponse) {
return
}
// only accept puts; a delete will make observe() spin
// find the smaller create revision among the puts
for _, ev := range wr.Events {
if ev.Type == mvccpb.PUT {
if kv == nil || ev.Kv.CreateRevision < kv.CreateRevision {
hdr, kv = &wr.Header, ev.Kv
// may have multiple revs; hdr.rev = the last rev
// set to kv's rev in case batch has multiple Puts
hdr.Revision = kv.ModRevision
break
}
}
}
}