k3s/vendor/github.com/k3s-io/kine/pkg/server/compact.go

package server

import (
	"context"

	"go.etcd.io/etcd/etcdserver/etcdserverpb"
	"go.etcd.io/etcd/mvcc/mvccpb"
)

func isCompact(txn *etcdserverpb.TxnRequest) bool {
	// See https://github.com/kubernetes/kubernetes/blob/442a69c3bdf6fe8e525b05887e57d89db1e2f3a5/staging/src/k8s.io/apiserver/pkg/storage/etcd3/compact.go#L72
	return len(txn.Compare) == 1 &&
		txn.Compare[0].Target == etcdserverpb.Compare_VERSION &&
		txn.Compare[0].Result == etcdserverpb.Compare_EQUAL &&
		len(txn.Success) == 1 &&
		txn.Success[0].GetRequestPut() != nil &&
		len(txn.Failure) == 1 &&
		txn.Failure[0].GetRequestRange() != nil &&
		string(txn.Compare[0].Key) == "compact_rev_key"
}

func (l *LimitedServer) compact(ctx context.Context) (*etcdserverpb.TxnResponse, error) {
	// return comparison failure so that the apiserver does not bother compacting
	return &etcdserverpb.TxnResponse{
		Header:    &etcdserverpb.ResponseHeader{},
		Succeeded: false,
		Responses: []*etcdserverpb.ResponseOp{
			{
				Response: &etcdserverpb.ResponseOp_ResponseRange{
					ResponseRange: &etcdserverpb.RangeResponse{
						Header: &etcdserverpb.ResponseHeader{},
						Kvs: []*mvccpb.KeyValue{
							&mvccpb.KeyValue{},
						},
						Count: 1,
					},
				},
			},
		},
	}, nil
}