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