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// Copyright 2017 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package namespace
import (
"bytes"
"context"
"gitee.com/wanttobeamaster/etcd/clientv3"
)
type leasePrefix struct {
clientv3.Lease
pfx []byte
}
// NewLease wraps a Lease interface to filter for only keys with a prefix
// and remove that prefix when fetching attached keys through TimeToLive.
func NewLease(l clientv3.Lease, prefix string) clientv3.Lease {
return &leasePrefix{l, []byte(prefix)}
}
func (l *leasePrefix) TimeToLive(ctx context.Context, id clientv3.LeaseID, opts ...clientv3.LeaseOption) (*clientv3.LeaseTimeToLiveResponse, error) {
resp, err := l.Lease.TimeToLive(ctx, id, opts...)
if err != nil {
return nil, err
}
if len(resp.Keys) > 0 {
var outKeys [][]byte
for i := range resp.Keys {
if len(resp.Keys[i]) < len(l.pfx) {
// too short
continue
}
if !bytes.Equal(resp.Keys[i][:len(l.pfx)], l.pfx) {
// doesn't match prefix
continue
}
// strip prefix
outKeys = append(outKeys, resp.Keys[i][len(l.pfx):])
}
resp.Keys = outKeys
}
return resp, nil
}
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