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Introduce Kubernetes interface to etcd client
Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| package clientv3 | ||
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| import ( | ||
| "context" | ||
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| pb "go.etcd.io/etcd/api/v3/etcdserverpb" | ||
| "go.etcd.io/etcd/api/v3/mvccpb" | ||
| ) | ||
|
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| func NewKubernetes(c *Client) Kubernetes { | ||
| return &kubernetes{kv: RetryKVClient(c), watcher: newWatchFromWatchClient(pb.NewWatchClient(c.conn), c)} | ||
| } | ||
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| type Kubernetes interface { | ||
| Get(ctx context.Context, key string, opts GetOptions) (KubernetesGetResponse, error) | ||
| List(ctx context.Context, prefix string, opts ListOptions) (KubernetesListResponse, error) | ||
| Count(ctx context.Context, prefix string) (int64, error) | ||
| OptimisticPut(ctx context.Context, key string, value []byte, opts PutOptions) (KubernetesPutResponse, error) | ||
| OptimisticDelete(ctx context.Context, key string, opts DeleteOptions) (KubernetesDeleteResponse, error) | ||
| Watch(ctx context.Context, key string, opts WatchOptions) WatchChan | ||
| RequestProgress(ctx context.Context, opts RequestProgressOptions) error | ||
| } | ||
|
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| type WatchID string | ||
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| type GetOptions struct { | ||
| Revision int64 | ||
| } | ||
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| type ListOptions struct { | ||
| Revision int64 | ||
| Limit int64 | ||
| Continue string | ||
| } | ||
|
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| type WatchOptions struct { | ||
| StreamKey string | ||
| Revision int64 | ||
| Prefix bool | ||
| } | ||
|
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| type PutOptions struct { | ||
| ExpectedRevision int64 | ||
| LeaseID LeaseID | ||
| } | ||
|
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| type DeleteOptions struct { | ||
| ExpectedRevision int64 | ||
| } | ||
|
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| type RequestProgressOptions struct { | ||
| StreamKey string | ||
| } | ||
|
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| type KubernetesGetResponse struct { | ||
| KV *mvccpb.KeyValue | ||
| Revision int64 | ||
| } | ||
|
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| type KubernetesListResponse struct { | ||
| KVs []*mvccpb.KeyValue | ||
| Count int64 | ||
| Revision int64 | ||
| } | ||
|
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| type KubernetesPutResponse struct { | ||
| KV *mvccpb.KeyValue | ||
| Succeeded bool | ||
| Revision int64 | ||
| } | ||
|
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| type KubernetesDeleteResponse struct { | ||
| KV *mvccpb.KeyValue | ||
| Succeeded bool | ||
| Revision int64 | ||
| } | ||
|
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| type kubernetes struct { | ||
| kv pb.KVClient | ||
| watcher *watcher | ||
| } | ||
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| func (k kubernetes) Get(ctx context.Context, key string, opts GetOptions) (resp KubernetesGetResponse, err error) { | ||
| rangeResp, err := k.kv.Range(ctx, &pb.RangeRequest{ | ||
| Key: []byte(key), | ||
| Revision: opts.Revision, | ||
| Limit: 1, | ||
| }) | ||
| if err != nil { | ||
| return resp, toErr(ctx, err) | ||
| } | ||
| resp.Revision = rangeResp.Header.Revision | ||
| if len(rangeResp.Kvs) == 1 { | ||
| resp.KV = rangeResp.Kvs[0] | ||
| } | ||
| return resp, nil | ||
| } | ||
|
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| func (k kubernetes) List(ctx context.Context, prefix string, opts ListOptions) (resp KubernetesListResponse, err error) { | ||
| rangeStart := prefix + opts.Continue | ||
| rangeEnd := GetPrefixRangeEnd(prefix) | ||
|
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| 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, toErr(ctx, err) | ||
| } | ||
| resp.KVs = rangeResp.Kvs | ||
| resp.Count = rangeResp.Count | ||
| resp.Revision = rangeResp.Header.Revision | ||
| return resp, nil | ||
| } | ||
|
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| func (k kubernetes) Count(ctx context.Context, prefix string) (int64, error) { | ||
| resp, err := k.kv.Range(ctx, &pb.RangeRequest{ | ||
| Key: []byte(prefix), | ||
| RangeEnd: []byte(GetPrefixRangeEnd(prefix)), | ||
| CountOnly: true, | ||
| }) | ||
| if err != nil { | ||
| return 0, toErr(ctx, err) | ||
| } | ||
| return resp.Count, nil | ||
| } | ||
|
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| func (k kubernetes) OptimisticPut(ctx context.Context, key string, value []byte, opts PutOptions) (resp KubernetesPutResponse, err error) { | ||
| put := &pb.RequestOp{Request: &pb.RequestOp_RequestPut{RequestPut: &pb.PutRequest{Key: []byte(key), Value: value, Lease: int64(opts.LeaseID)}}} | ||
|
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| txnResp, err := k.optimisticTxn(ctx, key, opts.ExpectedRevision, put) | ||
| if err != nil { | ||
| return resp, toErr(ctx, err) | ||
| } | ||
| resp.Succeeded = txnResp.Succeeded | ||
| resp.Revision = txnResp.Header.Revision | ||
| if !txnResp.Succeeded { | ||
| resp.KV = kvFromTxnResponse(txnResp.Responses[0]) | ||
| } | ||
| return resp, nil | ||
| } | ||
|
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| func (k kubernetes) OptimisticDelete(ctx context.Context, key string, opts DeleteOptions) (resp KubernetesDeleteResponse, err error) { | ||
| del := &pb.RequestOp{Request: &pb.RequestOp_RequestDeleteRange{RequestDeleteRange: &pb.DeleteRangeRequest{Key: []byte(key)}}} | ||
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| txnResp, err := k.optimisticTxn(ctx, key, opts.ExpectedRevision, del) | ||
| if err != nil { | ||
| return resp, toErr(ctx, err) | ||
| } | ||
| resp.Succeeded = txnResp.Succeeded | ||
| resp.Revision = txnResp.Header.Revision | ||
| if !txnResp.Succeeded { | ||
| resp.KV = kvFromTxnResponse(txnResp.Responses[0]) | ||
| } | ||
| return resp, nil | ||
| } | ||
|
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| func (k kubernetes) optimisticTxn(ctx context.Context, key string, expectRevision int64, onSuccess *pb.RequestOp) (*pb.TxnResponse, error) { | ||
| txn := &pb.TxnRequest{ | ||
| Compare: []*pb.Compare{&pb.Compare{ | ||
| Result: pb.Compare_EQUAL, | ||
| Target: pb.Compare_MOD, | ||
| Key: []byte(key), | ||
| TargetUnion: &pb.Compare_ModRevision{ModRevision: expectRevision}, | ||
| }}, | ||
| Success: []*pb.RequestOp{onSuccess}, | ||
| Failure: []*pb.RequestOp{{Request: &pb.RequestOp_RequestRange{RequestRange: &pb.RangeRequest{Key: []byte(key), Limit: 1}}}}, | ||
| } | ||
| return k.kv.Txn(ctx, txn) | ||
| } | ||
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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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| func (k kubernetes) Watch(ctx context.Context, key string, opts WatchOptions) WatchChan { | ||
| ctx = WithRequireLeader(ctx) | ||
| if opts.StreamKey == "" { | ||
| opts.StreamKey = streamKeyFromCtx(ctx) | ||
| } | ||
|
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| wr := &watchRequest{ | ||
| ctx: ctx, | ||
| key: key, | ||
| end: GetPrefixRangeEnd(key), | ||
| rev: opts.Revision, | ||
| progressNotify: true, | ||
| prevKV: true, | ||
| retc: make(chan chan WatchResponse, 1), | ||
| } | ||
| return k.watcher.watch(ctx, opts.StreamKey, wr) | ||
| } | ||
|
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| func (k kubernetes) RequestProgress(ctx context.Context, opts RequestProgressOptions) error { | ||
| return k.watcher.requestProgress(ctx, opts.StreamKey) | ||
| } |
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