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497 lines
17 KiB
Go
497 lines
17 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package clientv3
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import (
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"context"
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"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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type retryPolicy uint8
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const (
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repeatable retryPolicy = iota
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nonRepeatable
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)
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type rpcFunc func(ctx context.Context) error
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type retryRPCFunc func(context.Context, rpcFunc, retryPolicy) error
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type retryStopErrFunc func(error) bool
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// immutable requests (e.g. Get) should be retried unless it's
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// an obvious server-side error (e.g. rpctypes.ErrRequestTooLarge).
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//
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// "isRepeatableStopError" returns "true" when an immutable request
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// is interrupted by server-side or gRPC-side error and its status
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// code is not transient (!= codes.Unavailable).
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//
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// Returning "true" means retry should stop, since client cannot
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// handle itself even with retries.
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func isRepeatableStopError(err error) bool {
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eErr := rpctypes.Error(err)
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// always stop retry on etcd errors
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if serverErr, ok := eErr.(rpctypes.EtcdError); ok && serverErr.Code() != codes.Unavailable {
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return true
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}
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// only retry if unavailable
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ev, _ := status.FromError(err)
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return ev.Code() != codes.Unavailable
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}
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// mutable requests (e.g. Put, Delete, Txn) should only be retried
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// when the status code is codes.Unavailable when initial connection
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// has not been established (no pinned endpoint).
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//
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// "isNonRepeatableStopError" returns "true" when a mutable request
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// is interrupted by non-transient error that client cannot handle itself,
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// or transient error while the connection has already been established
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// (pinned endpoint exists).
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//
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// Returning "true" means retry should stop, otherwise it violates
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// write-at-most-once semantics.
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func isNonRepeatableStopError(err error) bool {
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ev, _ := status.FromError(err)
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if ev.Code() != codes.Unavailable {
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return true
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}
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desc := rpctypes.ErrorDesc(err)
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return desc != "there is no address available" && desc != "there is no connection available"
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}
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func (c *Client) newRetryWrapper() retryRPCFunc {
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return func(rpcCtx context.Context, f rpcFunc, rp retryPolicy) error {
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var isStop retryStopErrFunc
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switch rp {
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case repeatable:
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isStop = isRepeatableStopError
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case nonRepeatable:
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isStop = isNonRepeatableStopError
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}
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for {
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if err := readyWait(rpcCtx, c.ctx, c.balancer.ConnectNotify()); err != nil {
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return err
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}
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pinned := c.balancer.pinned()
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err := f(rpcCtx)
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if err == nil {
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return nil
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}
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logger.Lvl(4).Infof("clientv3/retry: error %q on pinned endpoint %q", err.Error(), pinned)
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if s, ok := status.FromError(err); ok && (s.Code() == codes.Unavailable || s.Code() == codes.DeadlineExceeded || s.Code() == codes.Internal) {
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// mark this before endpoint switch is triggered
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c.balancer.hostPortError(pinned, err)
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c.balancer.next()
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logger.Lvl(4).Infof("clientv3/retry: switching from %q due to error %q", pinned, err.Error())
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}
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if isStop(err) {
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return err
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}
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}
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}
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}
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func (c *Client) newAuthRetryWrapper(retryf retryRPCFunc) retryRPCFunc {
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return func(rpcCtx context.Context, f rpcFunc, rp retryPolicy) error {
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for {
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pinned := c.balancer.pinned()
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err := retryf(rpcCtx, f, rp)
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if err == nil {
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return nil
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}
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logger.Lvl(4).Infof("clientv3/auth-retry: error %q on pinned endpoint %q", err.Error(), pinned)
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// always stop retry on etcd errors other than invalid auth token
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if rpctypes.Error(err) == rpctypes.ErrInvalidAuthToken {
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gterr := c.getToken(rpcCtx)
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if gterr != nil {
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logger.Lvl(4).Infof("clientv3/auth-retry: cannot retry due to error %q(%q) on pinned endpoint %q", err.Error(), gterr.Error(), pinned)
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return err // return the original error for simplicity
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}
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continue
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}
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return err
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}
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}
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}
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type retryKVClient struct {
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kc pb.KVClient
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retryf retryRPCFunc
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}
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// RetryKVClient implements a KVClient.
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func RetryKVClient(c *Client) pb.KVClient {
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return &retryKVClient{
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kc: pb.NewKVClient(c.conn),
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retryf: c.newAuthRetryWrapper(c.newRetryWrapper()),
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}
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}
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func (rkv *retryKVClient) Range(ctx context.Context, in *pb.RangeRequest, opts ...grpc.CallOption) (resp *pb.RangeResponse, err error) {
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err = rkv.retryf(ctx, func(rctx context.Context) error {
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resp, err = rkv.kc.Range(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rkv *retryKVClient) Put(ctx context.Context, in *pb.PutRequest, opts ...grpc.CallOption) (resp *pb.PutResponse, err error) {
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err = rkv.retryf(ctx, func(rctx context.Context) error {
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resp, err = rkv.kc.Put(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rkv *retryKVClient) DeleteRange(ctx context.Context, in *pb.DeleteRangeRequest, opts ...grpc.CallOption) (resp *pb.DeleteRangeResponse, err error) {
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err = rkv.retryf(ctx, func(rctx context.Context) error {
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resp, err = rkv.kc.DeleteRange(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rkv *retryKVClient) Txn(ctx context.Context, in *pb.TxnRequest, opts ...grpc.CallOption) (resp *pb.TxnResponse, err error) {
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// TODO: "repeatable" for read-only txn
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err = rkv.retryf(ctx, func(rctx context.Context) error {
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resp, err = rkv.kc.Txn(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rkv *retryKVClient) Compact(ctx context.Context, in *pb.CompactionRequest, opts ...grpc.CallOption) (resp *pb.CompactionResponse, err error) {
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err = rkv.retryf(ctx, func(rctx context.Context) error {
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resp, err = rkv.kc.Compact(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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type retryLeaseClient struct {
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lc pb.LeaseClient
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retryf retryRPCFunc
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}
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// RetryLeaseClient implements a LeaseClient.
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func RetryLeaseClient(c *Client) pb.LeaseClient {
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return &retryLeaseClient{
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lc: pb.NewLeaseClient(c.conn),
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retryf: c.newAuthRetryWrapper(c.newRetryWrapper()),
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}
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}
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func (rlc *retryLeaseClient) LeaseTimeToLive(ctx context.Context, in *pb.LeaseTimeToLiveRequest, opts ...grpc.CallOption) (resp *pb.LeaseTimeToLiveResponse, err error) {
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err = rlc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rlc.lc.LeaseTimeToLive(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rlc *retryLeaseClient) LeaseLeases(ctx context.Context, in *pb.LeaseLeasesRequest, opts ...grpc.CallOption) (resp *pb.LeaseLeasesResponse, err error) {
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err = rlc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rlc.lc.LeaseLeases(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rlc *retryLeaseClient) LeaseGrant(ctx context.Context, in *pb.LeaseGrantRequest, opts ...grpc.CallOption) (resp *pb.LeaseGrantResponse, err error) {
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err = rlc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rlc.lc.LeaseGrant(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rlc *retryLeaseClient) LeaseRevoke(ctx context.Context, in *pb.LeaseRevokeRequest, opts ...grpc.CallOption) (resp *pb.LeaseRevokeResponse, err error) {
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err = rlc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rlc.lc.LeaseRevoke(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rlc *retryLeaseClient) LeaseKeepAlive(ctx context.Context, opts ...grpc.CallOption) (stream pb.Lease_LeaseKeepAliveClient, err error) {
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err = rlc.retryf(ctx, func(rctx context.Context) error {
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stream, err = rlc.lc.LeaseKeepAlive(rctx, opts...)
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return err
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}, repeatable)
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return stream, err
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}
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type retryClusterClient struct {
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cc pb.ClusterClient
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retryf retryRPCFunc
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}
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// RetryClusterClient implements a ClusterClient.
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func RetryClusterClient(c *Client) pb.ClusterClient {
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return &retryClusterClient{
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cc: pb.NewClusterClient(c.conn),
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retryf: c.newRetryWrapper(),
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}
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}
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func (rcc *retryClusterClient) MemberList(ctx context.Context, in *pb.MemberListRequest, opts ...grpc.CallOption) (resp *pb.MemberListResponse, err error) {
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err = rcc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rcc.cc.MemberList(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rcc *retryClusterClient) MemberAdd(ctx context.Context, in *pb.MemberAddRequest, opts ...grpc.CallOption) (resp *pb.MemberAddResponse, err error) {
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err = rcc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rcc.cc.MemberAdd(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rcc *retryClusterClient) MemberRemove(ctx context.Context, in *pb.MemberRemoveRequest, opts ...grpc.CallOption) (resp *pb.MemberRemoveResponse, err error) {
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err = rcc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rcc.cc.MemberRemove(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rcc *retryClusterClient) MemberUpdate(ctx context.Context, in *pb.MemberUpdateRequest, opts ...grpc.CallOption) (resp *pb.MemberUpdateResponse, err error) {
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err = rcc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rcc.cc.MemberUpdate(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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type retryMaintenanceClient struct {
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mc pb.MaintenanceClient
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retryf retryRPCFunc
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}
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// RetryMaintenanceClient implements a Maintenance.
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func RetryMaintenanceClient(c *Client, conn *grpc.ClientConn) pb.MaintenanceClient {
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return &retryMaintenanceClient{
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mc: pb.NewMaintenanceClient(conn),
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retryf: c.newRetryWrapper(),
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}
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}
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func (rmc *retryMaintenanceClient) Alarm(ctx context.Context, in *pb.AlarmRequest, opts ...grpc.CallOption) (resp *pb.AlarmResponse, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rmc.mc.Alarm(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rmc *retryMaintenanceClient) Status(ctx context.Context, in *pb.StatusRequest, opts ...grpc.CallOption) (resp *pb.StatusResponse, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rmc.mc.Status(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rmc *retryMaintenanceClient) Hash(ctx context.Context, in *pb.HashRequest, opts ...grpc.CallOption) (resp *pb.HashResponse, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rmc.mc.Hash(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rmc *retryMaintenanceClient) HashKV(ctx context.Context, in *pb.HashKVRequest, opts ...grpc.CallOption) (resp *pb.HashKVResponse, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rmc.mc.HashKV(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rmc *retryMaintenanceClient) Snapshot(ctx context.Context, in *pb.SnapshotRequest, opts ...grpc.CallOption) (stream pb.Maintenance_SnapshotClient, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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stream, err = rmc.mc.Snapshot(rctx, in, opts...)
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return err
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}, repeatable)
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return stream, err
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}
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func (rmc *retryMaintenanceClient) MoveLeader(ctx context.Context, in *pb.MoveLeaderRequest, opts ...grpc.CallOption) (resp *pb.MoveLeaderResponse, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rmc.mc.MoveLeader(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rmc *retryMaintenanceClient) Defragment(ctx context.Context, in *pb.DefragmentRequest, opts ...grpc.CallOption) (resp *pb.DefragmentResponse, err error) {
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err = rmc.retryf(ctx, func(rctx context.Context) error {
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resp, err = rmc.mc.Defragment(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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type retryAuthClient struct {
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ac pb.AuthClient
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retryf retryRPCFunc
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}
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// RetryAuthClient implements a AuthClient.
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func RetryAuthClient(c *Client) pb.AuthClient {
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return &retryAuthClient{
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ac: pb.NewAuthClient(c.conn),
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retryf: c.newRetryWrapper(),
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}
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}
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func (rac *retryAuthClient) UserList(ctx context.Context, in *pb.AuthUserListRequest, opts ...grpc.CallOption) (resp *pb.AuthUserListResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.UserList(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rac *retryAuthClient) UserGet(ctx context.Context, in *pb.AuthUserGetRequest, opts ...grpc.CallOption) (resp *pb.AuthUserGetResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.UserGet(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rac *retryAuthClient) RoleGet(ctx context.Context, in *pb.AuthRoleGetRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleGetResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.RoleGet(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rac *retryAuthClient) RoleList(ctx context.Context, in *pb.AuthRoleListRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleListResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.RoleList(rctx, in, opts...)
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return err
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}, repeatable)
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return resp, err
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}
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func (rac *retryAuthClient) AuthEnable(ctx context.Context, in *pb.AuthEnableRequest, opts ...grpc.CallOption) (resp *pb.AuthEnableResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.AuthEnable(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rac *retryAuthClient) AuthDisable(ctx context.Context, in *pb.AuthDisableRequest, opts ...grpc.CallOption) (resp *pb.AuthDisableResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.AuthDisable(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rac *retryAuthClient) UserAdd(ctx context.Context, in *pb.AuthUserAddRequest, opts ...grpc.CallOption) (resp *pb.AuthUserAddResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.UserAdd(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rac *retryAuthClient) UserDelete(ctx context.Context, in *pb.AuthUserDeleteRequest, opts ...grpc.CallOption) (resp *pb.AuthUserDeleteResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.UserDelete(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rac *retryAuthClient) UserChangePassword(ctx context.Context, in *pb.AuthUserChangePasswordRequest, opts ...grpc.CallOption) (resp *pb.AuthUserChangePasswordResponse, err error) {
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err = rac.retryf(ctx, func(rctx context.Context) error {
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resp, err = rac.ac.UserChangePassword(rctx, in, opts...)
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return err
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}, nonRepeatable)
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return resp, err
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}
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func (rac *retryAuthClient) UserGrantRole(ctx context.Context, in *pb.AuthUserGrantRoleRequest, opts ...grpc.CallOption) (resp *pb.AuthUserGrantRoleResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.UserGrantRole(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|
|
|
|
func (rac *retryAuthClient) UserRevokeRole(ctx context.Context, in *pb.AuthUserRevokeRoleRequest, opts ...grpc.CallOption) (resp *pb.AuthUserRevokeRoleResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.UserRevokeRole(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|
|
|
|
func (rac *retryAuthClient) RoleAdd(ctx context.Context, in *pb.AuthRoleAddRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleAddResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.RoleAdd(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|
|
|
|
func (rac *retryAuthClient) RoleDelete(ctx context.Context, in *pb.AuthRoleDeleteRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleDeleteResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.RoleDelete(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|
|
|
|
func (rac *retryAuthClient) RoleGrantPermission(ctx context.Context, in *pb.AuthRoleGrantPermissionRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleGrantPermissionResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.RoleGrantPermission(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|
|
|
|
func (rac *retryAuthClient) RoleRevokePermission(ctx context.Context, in *pb.AuthRoleRevokePermissionRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleRevokePermissionResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.RoleRevokePermission(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|
|
|
|
func (rac *retryAuthClient) Authenticate(ctx context.Context, in *pb.AuthenticateRequest, opts ...grpc.CallOption) (resp *pb.AuthenticateResponse, err error) {
|
|
err = rac.retryf(ctx, func(rctx context.Context) error {
|
|
resp, err = rac.ac.Authenticate(rctx, in, opts...)
|
|
return err
|
|
}, nonRepeatable)
|
|
return resp, err
|
|
}
|