retry.go
// 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 (
"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type rpcFunc func(ctx context.Context) error
type retryRPCFunc func(context.Context, rpcFunc) error
type retryStopErrFunc func(error) bool
func isRepeatableStopError(err error) bool {
eErr := rpctypes.Error(err)
// always stop retry on etcd errors
if serverErr, ok := eErr.(rpctypes.EtcdError); ok && serverErr.Code() != codes.Unavailable {
return true
}
// only retry if unavailable
ev, _ := status.FromError(err)
return ev.Code() != codes.Unavailable
}
func isNonRepeatableStopError(err error) bool {
ev, _ := status.FromError(err)
if ev.Code() != codes.Unavailable {
return true
}
desc := rpctypes.ErrorDesc(err)
return desc != "there is no address available" && desc != "there is no connection available"
}
func (c *Client) newRetryWrapper(isStop retryStopErrFunc) retryRPCFunc {
return func(rpcCtx context.Context, f rpcFunc) error {
for {
if err := readyWait(rpcCtx, c.ctx, c.balancer.ConnectNotify()); err != nil {
return err
}
pinned := c.balancer.pinned()
err := f(rpcCtx)
if err == nil {
return nil
}
if logger.V(4) {
logger.Infof("clientv3/retry: error %q on pinned endpoint %q", err.Error(), pinned)
}
if s, ok := status.FromError(err); ok && (s.Code() == codes.Unavailable || s.Code() == codes.DeadlineExceeded || s.Code() == codes.Internal) {
// mark this before endpoint switch is triggered
c.balancer.hostPortError(pinned, err)
c.balancer.next()
if logger.V(4) {
logger.Infof("clientv3/retry: switching from %q due to error %q", pinned, err.Error())
}
}
if isStop(err) {
return err
}
}
}
}
func (c *Client) newAuthRetryWrapper() retryRPCFunc {
return func(rpcCtx context.Context, f rpcFunc) error {
for {
pinned := c.balancer.pinned()
err := f(rpcCtx)
if err == nil {
return nil
}
if logger.V(4) {
logger.Infof("clientv3/auth-retry: error %q on pinned endpoint %q", err.Error(), pinned)
}
// always stop retry on etcd errors other than invalid auth token
if rpctypes.Error(err) == rpctypes.ErrInvalidAuthToken {
gterr := c.getToken(rpcCtx)
if gterr != nil {
if logger.V(4) {
logger.Infof("clientv3/auth-retry: cannot retry due to error %q(%q) on pinned endpoint %q", err.Error(), gterr.Error(), pinned)
}
return err // return the original error for simplicity
}
continue
}
return err
}
}
}
// RetryKVClient implements a KVClient.
func RetryKVClient(c *Client) pb.KVClient {
repeatableRetry := c.newRetryWrapper(isRepeatableStopError)
nonRepeatableRetry := c.newRetryWrapper(isNonRepeatableStopError)
conn := pb.NewKVClient(c.conn)
retryBasic := &retryKVClient{&nonRepeatableKVClient{conn, nonRepeatableRetry}, repeatableRetry}
retryAuthWrapper := c.newAuthRetryWrapper()
return &retryKVClient{
&nonRepeatableKVClient{retryBasic, retryAuthWrapper},
retryAuthWrapper}
}
type retryKVClient struct {
*nonRepeatableKVClient
repeatableRetry retryRPCFunc
}
func (rkv *retryKVClient) Range(ctx context.Context, in *pb.RangeRequest, opts ...grpc.CallOption) (resp *pb.RangeResponse, err error) {
err = rkv.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rkv.kc.Range(rctx, in, opts...)
return err
})
return resp, err
}
type nonRepeatableKVClient struct {
kc pb.KVClient
nonRepeatableRetry retryRPCFunc
}
func (rkv *nonRepeatableKVClient) Put(ctx context.Context, in *pb.PutRequest, opts ...grpc.CallOption) (resp *pb.PutResponse, err error) {
err = rkv.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rkv.kc.Put(rctx, in, opts...)
return err
})
return resp, err
}
func (rkv *nonRepeatableKVClient) DeleteRange(ctx context.Context, in *pb.DeleteRangeRequest, opts ...grpc.CallOption) (resp *pb.DeleteRangeResponse, err error) {
err = rkv.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rkv.kc.DeleteRange(rctx, in, opts...)
return err
})
return resp, err
}
func (rkv *nonRepeatableKVClient) Txn(ctx context.Context, in *pb.TxnRequest, opts ...grpc.CallOption) (resp *pb.TxnResponse, err error) {
// TODO: repeatableRetry if read-only txn
err = rkv.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rkv.kc.Txn(rctx, in, opts...)
return err
})
return resp, err
}
func (rkv *nonRepeatableKVClient) Compact(ctx context.Context, in *pb.CompactionRequest, opts ...grpc.CallOption) (resp *pb.CompactionResponse, err error) {
err = rkv.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rkv.kc.Compact(rctx, in, opts...)
return err
})
return resp, err
}
type retryLeaseClient struct {
lc pb.LeaseClient
repeatableRetry retryRPCFunc
}
// RetryLeaseClient implements a LeaseClient.
func RetryLeaseClient(c *Client) pb.LeaseClient {
retry := &retryLeaseClient{
pb.NewLeaseClient(c.conn),
c.newRetryWrapper(isRepeatableStopError),
}
return &retryLeaseClient{retry, c.newAuthRetryWrapper()}
}
func (rlc *retryLeaseClient) LeaseTimeToLive(ctx context.Context, in *pb.LeaseTimeToLiveRequest, opts ...grpc.CallOption) (resp *pb.LeaseTimeToLiveResponse, err error) {
err = rlc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rlc.lc.LeaseTimeToLive(rctx, in, opts...)
return err
})
return resp, err
}
func (rlc *retryLeaseClient) LeaseGrant(ctx context.Context, in *pb.LeaseGrantRequest, opts ...grpc.CallOption) (resp *pb.LeaseGrantResponse, err error) {
err = rlc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rlc.lc.LeaseGrant(rctx, in, opts...)
return err
})
return resp, err
}
func (rlc *retryLeaseClient) LeaseRevoke(ctx context.Context, in *pb.LeaseRevokeRequest, opts ...grpc.CallOption) (resp *pb.LeaseRevokeResponse, err error) {
err = rlc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rlc.lc.LeaseRevoke(rctx, in, opts...)
return err
})
return resp, err
}
func (rlc *retryLeaseClient) LeaseKeepAlive(ctx context.Context, opts ...grpc.CallOption) (stream pb.Lease_LeaseKeepAliveClient, err error) {
err = rlc.repeatableRetry(ctx, func(rctx context.Context) error {
stream, err = rlc.lc.LeaseKeepAlive(rctx, opts...)
return err
})
return stream, err
}
type retryClusterClient struct {
*nonRepeatableClusterClient
repeatableRetry retryRPCFunc
}
// RetryClusterClient implements a ClusterClient.
func RetryClusterClient(c *Client) pb.ClusterClient {
repeatableRetry := c.newRetryWrapper(isRepeatableStopError)
nonRepeatableRetry := c.newRetryWrapper(isNonRepeatableStopError)
cc := pb.NewClusterClient(c.conn)
return &retryClusterClient{&nonRepeatableClusterClient{cc, nonRepeatableRetry}, repeatableRetry}
}
func (rcc *retryClusterClient) MemberList(ctx context.Context, in *pb.MemberListRequest, opts ...grpc.CallOption) (resp *pb.MemberListResponse, err error) {
err = rcc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rcc.cc.MemberList(rctx, in, opts...)
return err
})
return resp, err
}
type nonRepeatableClusterClient struct {
cc pb.ClusterClient
nonRepeatableRetry retryRPCFunc
}
func (rcc *nonRepeatableClusterClient) MemberAdd(ctx context.Context, in *pb.MemberAddRequest, opts ...grpc.CallOption) (resp *pb.MemberAddResponse, err error) {
err = rcc.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rcc.cc.MemberAdd(rctx, in, opts...)
return err
})
return resp, err
}
func (rcc *nonRepeatableClusterClient) MemberRemove(ctx context.Context, in *pb.MemberRemoveRequest, opts ...grpc.CallOption) (resp *pb.MemberRemoveResponse, err error) {
err = rcc.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rcc.cc.MemberRemove(rctx, in, opts...)
return err
})
return resp, err
}
func (rcc *nonRepeatableClusterClient) MemberUpdate(ctx context.Context, in *pb.MemberUpdateRequest, opts ...grpc.CallOption) (resp *pb.MemberUpdateResponse, err error) {
err = rcc.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rcc.cc.MemberUpdate(rctx, in, opts...)
return err
})
return resp, err
}
// RetryMaintenanceClient implements a Maintenance.
func RetryMaintenanceClient(c *Client, conn *grpc.ClientConn) pb.MaintenanceClient {
repeatableRetry := c.newRetryWrapper(isRepeatableStopError)
nonRepeatableRetry := c.newRetryWrapper(isNonRepeatableStopError)
mc := pb.NewMaintenanceClient(conn)
return &retryMaintenanceClient{&nonRepeatableMaintenanceClient{mc, nonRepeatableRetry}, repeatableRetry}
}
type retryMaintenanceClient struct {
*nonRepeatableMaintenanceClient
repeatableRetry retryRPCFunc
}
func (rmc *retryMaintenanceClient) Alarm(ctx context.Context, in *pb.AlarmRequest, opts ...grpc.CallOption) (resp *pb.AlarmResponse, err error) {
err = rmc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rmc.mc.Alarm(rctx, in, opts...)
return err
})
return resp, err
}
func (rmc *retryMaintenanceClient) Status(ctx context.Context, in *pb.StatusRequest, opts ...grpc.CallOption) (resp *pb.StatusResponse, err error) {
err = rmc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rmc.mc.Status(rctx, in, opts...)
return err
})
return resp, err
}
func (rmc *retryMaintenanceClient) Hash(ctx context.Context, in *pb.HashRequest, opts ...grpc.CallOption) (resp *pb.HashResponse, err error) {
err = rmc.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rmc.mc.Hash(rctx, in, opts...)
return err
})
return resp, err
}
func (rmc *retryMaintenanceClient) Snapshot(ctx context.Context, in *pb.SnapshotRequest, opts ...grpc.CallOption) (stream pb.Maintenance_SnapshotClient, err error) {
err = rmc.repeatableRetry(ctx, func(rctx context.Context) error {
stream, err = rmc.mc.Snapshot(rctx, in, opts...)
return err
})
return stream, err
}
type nonRepeatableMaintenanceClient struct {
mc pb.MaintenanceClient
nonRepeatableRetry retryRPCFunc
}
func (rmc *nonRepeatableMaintenanceClient) Defragment(ctx context.Context, in *pb.DefragmentRequest, opts ...grpc.CallOption) (resp *pb.DefragmentResponse, err error) {
err = rmc.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rmc.mc.Defragment(rctx, in, opts...)
return err
})
return resp, err
}
type retryAuthClient struct {
*nonRepeatableAuthClient
repeatableRetry retryRPCFunc
}
// RetryAuthClient implements a AuthClient.
func RetryAuthClient(c *Client) pb.AuthClient {
repeatableRetry := c.newRetryWrapper(isRepeatableStopError)
nonRepeatableRetry := c.newRetryWrapper(isNonRepeatableStopError)
ac := pb.NewAuthClient(c.conn)
return &retryAuthClient{&nonRepeatableAuthClient{ac, nonRepeatableRetry}, repeatableRetry}
}
func (rac *retryAuthClient) UserList(ctx context.Context, in *pb.AuthUserListRequest, opts ...grpc.CallOption) (resp *pb.AuthUserListResponse, err error) {
err = rac.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserList(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *retryAuthClient) UserGet(ctx context.Context, in *pb.AuthUserGetRequest, opts ...grpc.CallOption) (resp *pb.AuthUserGetResponse, err error) {
err = rac.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserGet(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *retryAuthClient) RoleGet(ctx context.Context, in *pb.AuthRoleGetRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleGetResponse, err error) {
err = rac.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.RoleGet(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *retryAuthClient) RoleList(ctx context.Context, in *pb.AuthRoleListRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleListResponse, err error) {
err = rac.repeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.RoleList(rctx, in, opts...)
return err
})
return resp, err
}
type nonRepeatableAuthClient struct {
ac pb.AuthClient
nonRepeatableRetry retryRPCFunc
}
func (rac *nonRepeatableAuthClient) AuthEnable(ctx context.Context, in *pb.AuthEnableRequest, opts ...grpc.CallOption) (resp *pb.AuthEnableResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.AuthEnable(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) AuthDisable(ctx context.Context, in *pb.AuthDisableRequest, opts ...grpc.CallOption) (resp *pb.AuthDisableResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.AuthDisable(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) UserAdd(ctx context.Context, in *pb.AuthUserAddRequest, opts ...grpc.CallOption) (resp *pb.AuthUserAddResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserAdd(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) UserDelete(ctx context.Context, in *pb.AuthUserDeleteRequest, opts ...grpc.CallOption) (resp *pb.AuthUserDeleteResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserDelete(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) UserChangePassword(ctx context.Context, in *pb.AuthUserChangePasswordRequest, opts ...grpc.CallOption) (resp *pb.AuthUserChangePasswordResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserChangePassword(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) UserGrantRole(ctx context.Context, in *pb.AuthUserGrantRoleRequest, opts ...grpc.CallOption) (resp *pb.AuthUserGrantRoleResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserGrantRole(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) UserRevokeRole(ctx context.Context, in *pb.AuthUserRevokeRoleRequest, opts ...grpc.CallOption) (resp *pb.AuthUserRevokeRoleResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.UserRevokeRole(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) RoleAdd(ctx context.Context, in *pb.AuthRoleAddRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleAddResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.RoleAdd(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) RoleDelete(ctx context.Context, in *pb.AuthRoleDeleteRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleDeleteResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.RoleDelete(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) RoleGrantPermission(ctx context.Context, in *pb.AuthRoleGrantPermissionRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleGrantPermissionResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.RoleGrantPermission(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) RoleRevokePermission(ctx context.Context, in *pb.AuthRoleRevokePermissionRequest, opts ...grpc.CallOption) (resp *pb.AuthRoleRevokePermissionResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.RoleRevokePermission(rctx, in, opts...)
return err
})
return resp, err
}
func (rac *nonRepeatableAuthClient) Authenticate(ctx context.Context, in *pb.AuthenticateRequest, opts ...grpc.CallOption) (resp *pb.AuthenticateResponse, err error) {
err = rac.nonRepeatableRetry(ctx, func(rctx context.Context) error {
resp, err = rac.ac.Authenticate(rctx, in, opts...)
return err
})
return resp, err
}
