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Merge pull request etcd-io#16333 from serathius/kubernetes
Introduce Kubernetes interface to etcd client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| // Copyright 2024 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 kubernetes | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| pb "go.etcd.io/etcd/api/v3/etcdserverpb" | ||
| "go.etcd.io/etcd/api/v3/mvccpb" | ||
| clientv3 "go.etcd.io/etcd/client/v3" | ||
| ) | ||
|
|
||
| // New creates Client from config. | ||
| // Caller is responsible to call Close() to clean up client. | ||
| func New(cfg clientv3.Config) (*Client, error) { | ||
| c, err := clientv3.New(cfg) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| kc := &Client{ | ||
| Client: c, | ||
| kv: clientv3.RetryKVClient(c), | ||
| } | ||
| kc.Kubernetes = kc | ||
| return kc, nil | ||
| } | ||
|
|
||
| type Client struct { | ||
| *clientv3.Client | ||
| Kubernetes Interface | ||
| kv pb.KVClient | ||
| } | ||
|
|
||
| var _ Interface = (*Client)(nil) | ||
|
|
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| func (k Client) Get(ctx context.Context, key string, opts GetOptions) (resp GetResponse, err error) { | ||
| rangeResp, err := k.kv.Range(ctx, getRequest(key, opts.Revision)) | ||
| if err != nil { | ||
| return resp, clientv3.ContextError(ctx, err) | ||
| } | ||
| resp.Revision = rangeResp.Header.Revision | ||
| if len(rangeResp.Kvs) == 1 { | ||
| resp.KV = rangeResp.Kvs[0] | ||
| } | ||
| return resp, nil | ||
| } | ||
|
|
||
| func (k Client) List(ctx context.Context, prefix string, opts ListOptions) (resp ListResponse, err error) { | ||
| rangeStart := prefix + opts.Continue | ||
| rangeEnd := clientv3.GetPrefixRangeEnd(prefix) | ||
|
|
||
| rangeResp, err := k.kv.Range(ctx, &pb.RangeRequest{ | ||
| Key: []byte(rangeStart), | ||
| RangeEnd: []byte(rangeEnd), | ||
| Limit: opts.Limit, | ||
| Revision: opts.Revision, | ||
| }) | ||
| if err != nil { | ||
| return resp, clientv3.ContextError(ctx, err) | ||
| } | ||
| resp.Kvs = rangeResp.Kvs | ||
| resp.Count = rangeResp.Count | ||
| resp.Revision = rangeResp.Header.Revision | ||
| return resp, nil | ||
| } | ||
|
|
||
| func (k Client) Count(ctx context.Context, prefix string, _ CountOptions) (int64, error) { | ||
| resp, err := k.kv.Range(ctx, &pb.RangeRequest{ | ||
| Key: []byte(prefix), | ||
| RangeEnd: []byte(clientv3.GetPrefixRangeEnd(prefix)), | ||
| CountOnly: true, | ||
| }) | ||
| if err != nil { | ||
| return 0, clientv3.ContextError(ctx, err) | ||
| } | ||
| return resp.Count, nil | ||
| } | ||
|
|
||
| func (k Client) OptimisticPut(ctx context.Context, key string, value []byte, expectedRevision int64, opts PutOptions) (resp PutResponse, err error) { | ||
| onSuccess := &pb.RequestOp{Request: &pb.RequestOp_RequestPut{RequestPut: &pb.PutRequest{Key: []byte(key), Value: value, Lease: int64(opts.LeaseID)}}} | ||
|
|
||
| var onFailure *pb.RequestOp | ||
| if opts.GetOnFailure { | ||
| onFailure = &pb.RequestOp{Request: &pb.RequestOp_RequestRange{RequestRange: getRequest(key, 0)}} | ||
| } | ||
|
|
||
| txnResp, err := k.optimisticTxn(ctx, key, expectedRevision, onSuccess, onFailure) | ||
| if err != nil { | ||
| return resp, clientv3.ContextError(ctx, err) | ||
| } | ||
| resp.Succeeded = txnResp.Succeeded | ||
| resp.Revision = txnResp.Header.Revision | ||
| if opts.GetOnFailure && !txnResp.Succeeded { | ||
| resp.KV = kvFromTxnResponse(txnResp.Responses[0]) | ||
| } | ||
| return resp, nil | ||
| } | ||
|
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| func (k Client) OptimisticDelete(ctx context.Context, key string, expectedRevision int64, opts DeleteOptions) (resp DeleteResponse, err error) { | ||
| onSuccess := &pb.RequestOp{Request: &pb.RequestOp_RequestDeleteRange{RequestDeleteRange: &pb.DeleteRangeRequest{Key: []byte(key)}}} | ||
|
|
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| var onFailure *pb.RequestOp | ||
| if opts.GetOnFailure { | ||
| onFailure = &pb.RequestOp{Request: &pb.RequestOp_RequestRange{RequestRange: getRequest(key, 0)}} | ||
| } | ||
|
|
||
| txnResp, err := k.optimisticTxn(ctx, key, expectedRevision, onSuccess, onFailure) | ||
| if err != nil { | ||
| return resp, clientv3.ContextError(ctx, err) | ||
| } | ||
| resp.Succeeded = txnResp.Succeeded | ||
| resp.Revision = txnResp.Header.Revision | ||
| if opts.GetOnFailure && !txnResp.Succeeded { | ||
| resp.KV = kvFromTxnResponse(txnResp.Responses[0]) | ||
| } | ||
| return resp, nil | ||
| } | ||
|
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| func (k Client) optimisticTxn(ctx context.Context, key string, expectedRevision int64, onSuccess, onFailure *pb.RequestOp) (*pb.TxnResponse, error) { | ||
| txn := &pb.TxnRequest{ | ||
| Compare: []*pb.Compare{ | ||
| { | ||
| Result: pb.Compare_EQUAL, | ||
| Target: pb.Compare_MOD, | ||
| Key: []byte(key), | ||
| TargetUnion: &pb.Compare_ModRevision{ModRevision: expectedRevision}, | ||
| }, | ||
| }, | ||
| } | ||
| if onSuccess != nil { | ||
| txn.Success = []*pb.RequestOp{onSuccess} | ||
| } | ||
| if onFailure != nil { | ||
| txn.Failure = []*pb.RequestOp{onFailure} | ||
| } | ||
| return k.kv.Txn(ctx, txn) | ||
| } | ||
|
|
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| func getRequest(key string, revision int64) *pb.RangeRequest { | ||
| return &pb.RangeRequest{ | ||
| Key: []byte(key), | ||
| Revision: revision, | ||
| Limit: 1, | ||
| } | ||
| } | ||
|
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| func kvFromTxnResponse(resp *pb.ResponseOp) *mvccpb.KeyValue { | ||
| getResponse := resp.GetResponseRange() | ||
| if len(getResponse.Kvs) == 1 { | ||
| return getResponse.Kvs[0] | ||
| } | ||
| return nil | ||
| } |
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