[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/clientv3/maintenance.go b/vendor/github.com/coreos/etcd/clientv3/maintenance.go
new file mode 100644
index 0000000..5e87cf8
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/clientv3/maintenance.go
@@ -0,0 +1,239 @@
+// Copyright 2016 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 clientv3
+
+import (
+ "context"
+ "fmt"
+ "io"
+
+ pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
+
+ "google.golang.org/grpc"
+)
+
+type (
+ DefragmentResponse pb.DefragmentResponse
+ AlarmResponse pb.AlarmResponse
+ AlarmMember pb.AlarmMember
+ StatusResponse pb.StatusResponse
+ HashKVResponse pb.HashKVResponse
+ MoveLeaderResponse pb.MoveLeaderResponse
+)
+
+type Maintenance interface {
+ // AlarmList gets all active alarms.
+ AlarmList(ctx context.Context) (*AlarmResponse, error)
+
+ // AlarmDisarm disarms a given alarm.
+ AlarmDisarm(ctx context.Context, m *AlarmMember) (*AlarmResponse, error)
+
+ // Defragment releases wasted space from internal fragmentation on a given etcd member.
+ // Defragment is only needed when deleting a large number of keys and want to reclaim
+ // the resources.
+ // Defragment is an expensive operation. User should avoid defragmenting multiple members
+ // at the same time.
+ // To defragment multiple members in the cluster, user need to call defragment multiple
+ // times with different endpoints.
+ Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error)
+
+ // Status gets the status of the endpoint.
+ Status(ctx context.Context, endpoint string) (*StatusResponse, error)
+
+ // HashKV returns a hash of the KV state at the time of the RPC.
+ // If revision is zero, the hash is computed on all keys. If the revision
+ // is non-zero, the hash is computed on all keys at or below the given revision.
+ HashKV(ctx context.Context, endpoint string, rev int64) (*HashKVResponse, error)
+
+ // Snapshot provides a reader for a point-in-time snapshot of etcd.
+ // If the context "ctx" is canceled or timed out, reading from returned
+ // "io.ReadCloser" would error out (e.g. context.Canceled, context.DeadlineExceeded).
+ Snapshot(ctx context.Context) (io.ReadCloser, error)
+
+ // MoveLeader requests current leader to transfer its leadership to the transferee.
+ // Request must be made to the leader.
+ MoveLeader(ctx context.Context, transfereeID uint64) (*MoveLeaderResponse, error)
+}
+
+type maintenance struct {
+ dial func(endpoint string) (pb.MaintenanceClient, func(), error)
+ remote pb.MaintenanceClient
+ callOpts []grpc.CallOption
+}
+
+func NewMaintenance(c *Client) Maintenance {
+ api := &maintenance{
+ dial: func(endpoint string) (pb.MaintenanceClient, func(), error) {
+ conn, err := c.Dial(endpoint)
+ if err != nil {
+ return nil, nil, fmt.Errorf("failed to dial endpoint %s with maintenance client: %v", endpoint, err)
+ }
+ cancel := func() { conn.Close() }
+ return RetryMaintenanceClient(c, conn), cancel, nil
+ },
+ remote: RetryMaintenanceClient(c, c.conn),
+ }
+ if c != nil {
+ api.callOpts = c.callOpts
+ }
+ return api
+}
+
+func NewMaintenanceFromMaintenanceClient(remote pb.MaintenanceClient, c *Client) Maintenance {
+ api := &maintenance{
+ dial: func(string) (pb.MaintenanceClient, func(), error) {
+ return remote, func() {}, nil
+ },
+ remote: remote,
+ }
+ if c != nil {
+ api.callOpts = c.callOpts
+ }
+ return api
+}
+
+func (m *maintenance) AlarmList(ctx context.Context) (*AlarmResponse, error) {
+ req := &pb.AlarmRequest{
+ Action: pb.AlarmRequest_GET,
+ MemberID: 0, // all
+ Alarm: pb.AlarmType_NONE, // all
+ }
+ resp, err := m.remote.Alarm(ctx, req, m.callOpts...)
+ if err == nil {
+ return (*AlarmResponse)(resp), nil
+ }
+ return nil, toErr(ctx, err)
+}
+
+func (m *maintenance) AlarmDisarm(ctx context.Context, am *AlarmMember) (*AlarmResponse, error) {
+ req := &pb.AlarmRequest{
+ Action: pb.AlarmRequest_DEACTIVATE,
+ MemberID: am.MemberID,
+ Alarm: am.Alarm,
+ }
+
+ if req.MemberID == 0 && req.Alarm == pb.AlarmType_NONE {
+ ar, err := m.AlarmList(ctx)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+ ret := AlarmResponse{}
+ for _, am := range ar.Alarms {
+ dresp, derr := m.AlarmDisarm(ctx, (*AlarmMember)(am))
+ if derr != nil {
+ return nil, toErr(ctx, derr)
+ }
+ ret.Alarms = append(ret.Alarms, dresp.Alarms...)
+ }
+ return &ret, nil
+ }
+
+ resp, err := m.remote.Alarm(ctx, req, m.callOpts...)
+ if err == nil {
+ return (*AlarmResponse)(resp), nil
+ }
+ return nil, toErr(ctx, err)
+}
+
+func (m *maintenance) Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error) {
+ remote, cancel, err := m.dial(endpoint)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+ defer cancel()
+ resp, err := remote.Defragment(ctx, &pb.DefragmentRequest{}, m.callOpts...)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+ return (*DefragmentResponse)(resp), nil
+}
+
+func (m *maintenance) Status(ctx context.Context, endpoint string) (*StatusResponse, error) {
+ remote, cancel, err := m.dial(endpoint)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+ defer cancel()
+ resp, err := remote.Status(ctx, &pb.StatusRequest{}, m.callOpts...)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+ return (*StatusResponse)(resp), nil
+}
+
+func (m *maintenance) HashKV(ctx context.Context, endpoint string, rev int64) (*HashKVResponse, error) {
+ remote, cancel, err := m.dial(endpoint)
+ if err != nil {
+
+ return nil, toErr(ctx, err)
+ }
+ defer cancel()
+ resp, err := remote.HashKV(ctx, &pb.HashKVRequest{Revision: rev}, m.callOpts...)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+ return (*HashKVResponse)(resp), nil
+}
+
+func (m *maintenance) Snapshot(ctx context.Context) (io.ReadCloser, error) {
+ ss, err := m.remote.Snapshot(ctx, &pb.SnapshotRequest{}, append(m.callOpts, withMax(defaultStreamMaxRetries))...)
+ if err != nil {
+ return nil, toErr(ctx, err)
+ }
+
+ plog.Info("opened snapshot stream; downloading")
+ pr, pw := io.Pipe()
+ go func() {
+ for {
+ resp, err := ss.Recv()
+ if err != nil {
+ switch err {
+ case io.EOF:
+ plog.Info("completed snapshot read; closing")
+ default:
+ plog.Warningf("failed to receive from snapshot stream; closing (%v)", err)
+ }
+ pw.CloseWithError(err)
+ return
+ }
+
+ // can "resp == nil && err == nil"
+ // before we receive snapshot SHA digest?
+ // No, server sends EOF with an empty response
+ // after it sends SHA digest at the end
+
+ if _, werr := pw.Write(resp.Blob); werr != nil {
+ pw.CloseWithError(werr)
+ return
+ }
+ }
+ }()
+ return &snapshotReadCloser{ctx: ctx, ReadCloser: pr}, nil
+}
+
+type snapshotReadCloser struct {
+ ctx context.Context
+ io.ReadCloser
+}
+
+func (rc *snapshotReadCloser) Read(p []byte) (n int, err error) {
+ n, err = rc.ReadCloser.Read(p)
+ return n, toErr(rc.ctx, err)
+}
+
+func (m *maintenance) MoveLeader(ctx context.Context, transfereeID uint64) (*MoveLeaderResponse, error) {
+ resp, err := m.remote.MoveLeader(ctx, &pb.MoveLeaderRequest{TargetID: transfereeID}, m.callOpts...)
+ return (*MoveLeaderResponse)(resp), toErr(ctx, err)
+}