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dex/vendor/go.etcd.io/etcd/clientv3/namespace/kv.go
2020-01-31 10:32:00 +01:00

206 lines
5.4 KiB
Go

// 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 (
"context"
"go.etcd.io/etcd/clientv3"
"go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
)
type kvPrefix struct {
clientv3.KV
pfx string
}
// NewKV wraps a KV instance so that all requests
// are prefixed with a given string.
func NewKV(kv clientv3.KV, prefix string) clientv3.KV {
return &kvPrefix{kv, prefix}
}
func (kv *kvPrefix) Put(ctx context.Context, key, val string, opts ...clientv3.OpOption) (*clientv3.PutResponse, error) {
if len(key) == 0 {
return nil, rpctypes.ErrEmptyKey
}
op := kv.prefixOp(clientv3.OpPut(key, val, opts...))
r, err := kv.KV.Do(ctx, op)
if err != nil {
return nil, err
}
put := r.Put()
kv.unprefixPutResponse(put)
return put, nil
}
func (kv *kvPrefix) Get(ctx context.Context, key string, opts ...clientv3.OpOption) (*clientv3.GetResponse, error) {
if len(key) == 0 {
return nil, rpctypes.ErrEmptyKey
}
r, err := kv.KV.Do(ctx, kv.prefixOp(clientv3.OpGet(key, opts...)))
if err != nil {
return nil, err
}
get := r.Get()
kv.unprefixGetResponse(get)
return get, nil
}
func (kv *kvPrefix) Delete(ctx context.Context, key string, opts ...clientv3.OpOption) (*clientv3.DeleteResponse, error) {
if len(key) == 0 {
return nil, rpctypes.ErrEmptyKey
}
r, err := kv.KV.Do(ctx, kv.prefixOp(clientv3.OpDelete(key, opts...)))
if err != nil {
return nil, err
}
del := r.Del()
kv.unprefixDeleteResponse(del)
return del, nil
}
func (kv *kvPrefix) Do(ctx context.Context, op clientv3.Op) (clientv3.OpResponse, error) {
if len(op.KeyBytes()) == 0 && !op.IsTxn() {
return clientv3.OpResponse{}, rpctypes.ErrEmptyKey
}
r, err := kv.KV.Do(ctx, kv.prefixOp(op))
if err != nil {
return r, err
}
switch {
case r.Get() != nil:
kv.unprefixGetResponse(r.Get())
case r.Put() != nil:
kv.unprefixPutResponse(r.Put())
case r.Del() != nil:
kv.unprefixDeleteResponse(r.Del())
case r.Txn() != nil:
kv.unprefixTxnResponse(r.Txn())
}
return r, nil
}
type txnPrefix struct {
clientv3.Txn
kv *kvPrefix
}
func (kv *kvPrefix) Txn(ctx context.Context) clientv3.Txn {
return &txnPrefix{kv.KV.Txn(ctx), kv}
}
func (txn *txnPrefix) If(cs ...clientv3.Cmp) clientv3.Txn {
txn.Txn = txn.Txn.If(txn.kv.prefixCmps(cs)...)
return txn
}
func (txn *txnPrefix) Then(ops ...clientv3.Op) clientv3.Txn {
txn.Txn = txn.Txn.Then(txn.kv.prefixOps(ops)...)
return txn
}
func (txn *txnPrefix) Else(ops ...clientv3.Op) clientv3.Txn {
txn.Txn = txn.Txn.Else(txn.kv.prefixOps(ops)...)
return txn
}
func (txn *txnPrefix) Commit() (*clientv3.TxnResponse, error) {
resp, err := txn.Txn.Commit()
if err != nil {
return nil, err
}
txn.kv.unprefixTxnResponse(resp)
return resp, nil
}
func (kv *kvPrefix) prefixOp(op clientv3.Op) clientv3.Op {
if !op.IsTxn() {
begin, end := kv.prefixInterval(op.KeyBytes(), op.RangeBytes())
op.WithKeyBytes(begin)
op.WithRangeBytes(end)
return op
}
cmps, thenOps, elseOps := op.Txn()
return clientv3.OpTxn(kv.prefixCmps(cmps), kv.prefixOps(thenOps), kv.prefixOps(elseOps))
}
func (kv *kvPrefix) unprefixGetResponse(resp *clientv3.GetResponse) {
for i := range resp.Kvs {
resp.Kvs[i].Key = resp.Kvs[i].Key[len(kv.pfx):]
}
}
func (kv *kvPrefix) unprefixPutResponse(resp *clientv3.PutResponse) {
if resp.PrevKv != nil {
resp.PrevKv.Key = resp.PrevKv.Key[len(kv.pfx):]
}
}
func (kv *kvPrefix) unprefixDeleteResponse(resp *clientv3.DeleteResponse) {
for i := range resp.PrevKvs {
resp.PrevKvs[i].Key = resp.PrevKvs[i].Key[len(kv.pfx):]
}
}
func (kv *kvPrefix) unprefixTxnResponse(resp *clientv3.TxnResponse) {
for _, r := range resp.Responses {
switch tv := r.Response.(type) {
case *pb.ResponseOp_ResponseRange:
if tv.ResponseRange != nil {
kv.unprefixGetResponse((*clientv3.GetResponse)(tv.ResponseRange))
}
case *pb.ResponseOp_ResponsePut:
if tv.ResponsePut != nil {
kv.unprefixPutResponse((*clientv3.PutResponse)(tv.ResponsePut))
}
case *pb.ResponseOp_ResponseDeleteRange:
if tv.ResponseDeleteRange != nil {
kv.unprefixDeleteResponse((*clientv3.DeleteResponse)(tv.ResponseDeleteRange))
}
case *pb.ResponseOp_ResponseTxn:
if tv.ResponseTxn != nil {
kv.unprefixTxnResponse((*clientv3.TxnResponse)(tv.ResponseTxn))
}
default:
}
}
}
func (kv *kvPrefix) prefixInterval(key, end []byte) (pfxKey []byte, pfxEnd []byte) {
return prefixInterval(kv.pfx, key, end)
}
func (kv *kvPrefix) prefixCmps(cs []clientv3.Cmp) []clientv3.Cmp {
newCmps := make([]clientv3.Cmp, len(cs))
for i := range cs {
newCmps[i] = cs[i]
pfxKey, endKey := kv.prefixInterval(cs[i].KeyBytes(), cs[i].RangeEnd)
newCmps[i].WithKeyBytes(pfxKey)
if len(cs[i].RangeEnd) != 0 {
newCmps[i].RangeEnd = endKey
}
}
return newCmps
}
func (kv *kvPrefix) prefixOps(ops []clientv3.Op) []clientv3.Op {
newOps := make([]clientv3.Op, len(ops))
for i := range ops {
newOps[i] = kv.prefixOp(ops[i])
}
return newOps
}