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leasing: don't acquire lease on ttl'd keys

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TTL'd keys may expire on cluster without lease holder's consent.
This commit is contained in:
Anthony Romano 2017-08-21 12:12:53 -07:00
parent cf0a07be52
commit 5c03ade973
1 changed files with 5 additions and 2 deletions
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7
clientv3/leasing/kv.go
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@ -22,6 +22,7 @@ import (
v3 "github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/clientv3/concurrency"
"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/mvcc/mvccpb"
"golang.org/x/net/context"
@ -261,8 +262,10 @@ func (lkv *leasingKV) acquire(ctx context.Context, key string, op v3.Op) (*v3.Tx
if err := lkv.waitSession(ctx); err != nil {
return nil, err
}
lcmp := v3.Cmp{Key: []byte(key), Target: pb.Compare_LEASE}
resp, err := lkv.kv.Txn(ctx).If(
v3.Compare(v3.CreateRevision(lkv.pfx+key), "=", 0)).
v3.Compare(v3.CreateRevision(lkv.pfx+key), "=", 0),
v3.Compare(lcmp, "=", 0)).
Then(
op,
v3.OpPut(lkv.pfx+key, "", v3.WithLease(lkv.leaseID()))).
@ -274,7 +277,7 @@ func (lkv *leasingKV) acquire(ctx context.Context, key string, op v3.Op) (*v3.Tx
if !resp.Succeeded {
kvs := resp.Responses[1].GetResponseRange().Kvs
// if txn failed since already owner, lease is acquired
resp.Succeeded = v3.LeaseID(kvs[0].Lease) == lkv.leaseID()
resp.Succeeded = len(kvs) > 0 && v3.LeaseID(kvs[0].Lease) == lkv.leaseID()
}
return resp, nil
}