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// 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"
pb "go.etcd.io/etcd/api/v3/etcdserverpb"
"go.etcd.io/etcd/client/pkg/v3/types"
"google.golang.org/grpc"
)
type (
Member pb.Member
MemberListResponse pb.MemberListResponse
MemberAddResponse pb.MemberAddResponse
MemberRemoveResponse pb.MemberRemoveResponse
MemberUpdateResponse pb.MemberUpdateResponse
MemberPromoteResponse pb.MemberPromoteResponse
)
type Cluster interface {
// MemberList lists the current cluster membership.
MemberList(ctx context.Context) (*MemberListResponse, error)
// MemberAdd adds a new member into the cluster.
MemberAdd(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error)
// MemberAddAsLearner adds a new learner member into the cluster.
MemberAddAsLearner(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error)
// MemberRemove removes an existing member from the cluster.
MemberRemove(ctx context.Context, id uint64) (*MemberRemoveResponse, error)
// MemberUpdate updates the peer addresses of the member.
MemberUpdate(ctx context.Context, id uint64, peerAddrs []string) (*MemberUpdateResponse, error)
// MemberPromote promotes a member from raft learner (non-voting) to raft voting member.
MemberPromote(ctx context.Context, id uint64) (*MemberPromoteResponse, error)
}
type cluster struct {
remote pb.ClusterClient
callOpts []grpc.CallOption
}
func NewCluster(c *Client) Cluster {
api := &cluster{remote: RetryClusterClient(c)}
if c != nil {
api.callOpts = c.callOpts
}
return api
}
func NewClusterFromClusterClient(remote pb.ClusterClient, c *Client) Cluster {
api := &cluster{remote: remote}
if c != nil {
api.callOpts = c.callOpts
}
return api
}
func (c *cluster) MemberAdd(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error) {
return c.memberAdd(ctx, peerAddrs, false)
}
func (c *cluster) MemberAddAsLearner(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error) {
return c.memberAdd(ctx, peerAddrs, true)
}
func (c *cluster) memberAdd(ctx context.Context, peerAddrs []string, isLearner bool) (*MemberAddResponse, error) {
// fail-fast before panic in rafthttp
if _, err := types.NewURLs(peerAddrs); err != nil {
return nil, err
}
r := &pb.MemberAddRequest{
PeerURLs: peerAddrs,
IsLearner: isLearner,
}
resp, err := c.remote.MemberAdd(ctx, r, c.callOpts...)
if err != nil {
return nil, ContextError(ctx, err)
}
return (*MemberAddResponse)(resp), nil
}
func (c *cluster) MemberRemove(ctx context.Context, id uint64) (*MemberRemoveResponse, error) {
r := &pb.MemberRemoveRequest{ID: id}
resp, err := c.remote.MemberRemove(ctx, r, c.callOpts...)
if err != nil {
return nil, ContextError(ctx, err)
}
return (*MemberRemoveResponse)(resp), nil
}
func (c *cluster) MemberUpdate(ctx context.Context, id uint64, peerAddrs []string) (*MemberUpdateResponse, error) {
// fail-fast before panic in rafthttp
if _, err := types.NewURLs(peerAddrs); err != nil {
return nil, err
}
// it is safe to retry on update.
r := &pb.MemberUpdateRequest{ID: id, PeerURLs: peerAddrs}
resp, err := c.remote.MemberUpdate(ctx, r, c.callOpts...)
if err == nil {
return (*MemberUpdateResponse)(resp), nil
}
return nil, ContextError(ctx, err)
}
func (c *cluster) MemberList(ctx context.Context) (*MemberListResponse, error) {
// it is safe to retry on list.
resp, err := c.remote.MemberList(ctx, &pb.MemberListRequest{Linearizable: true}, c.callOpts...)
if err == nil {
return (*MemberListResponse)(resp), nil
}
return nil, ContextError(ctx, err)
}
func (c *cluster) MemberPromote(ctx context.Context, id uint64) (*MemberPromoteResponse, error) {
r := &pb.MemberPromoteRequest{ID: id}
resp, err := c.remote.MemberPromote(ctx, r, c.callOpts...)
if err != nil {
return nil, ContextError(ctx, err)
}
return (*MemberPromoteResponse)(resp), nil
}
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