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event.go
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event.go
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/*
* Copyright 2022 CECTC, Inc.
*
* 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 etcd
import (
"fmt"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
)
type event struct {
key string
value []byte
prevValue []byte
rev int64
isDeleted bool
isCreated bool
isProgressNotify bool
}
// parseKV converts a KeyValue retrieved from an initial sync() listing to a synthetic isCreated event.
func parseKV(kv *mvccpb.KeyValue) *event {
return &event{
key: string(kv.Key),
value: kv.Value,
prevValue: nil,
rev: kv.ModRevision,
isDeleted: false,
isCreated: true,
}
}
func parseEvent(e *clientv3.Event) (*event, error) {
if !e.IsCreate() && e.PrevKv == nil {
// If the previous value is nil, error. One example of how this is possible is if the previous value has been compacted already.
return nil, fmt.Errorf("etcd event received with PrevKv=nil (key=%q, modRevision=%d, type=%s)", string(e.Kv.Key), e.Kv.ModRevision, e.Type.String())
}
ret := &event{
key: string(e.Kv.Key),
value: e.Kv.Value,
rev: e.Kv.ModRevision,
isDeleted: e.Type == clientv3.EventTypeDelete,
isCreated: e.IsCreate(),
}
if e.PrevKv != nil {
ret.prevValue = e.PrevKv.Value
}
return ret, nil
}
func progressNotifyEvent(rev int64) *event {
return &event{
rev: rev,
isProgressNotify: true,
}
}