github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/lorry/operations/switchover.go (about)

     1  /*
     2  Copyright (C) 2022-2023 ApeCloud Co., Ltd
     3  
     4  This file is part of KubeBlocks project
     5  
     6  This program is free software: you can redistribute it and/or modify
     7  it under the terms of the GNU Affero General Public License as published by
     8  the Free Software Foundation, either version 3 of the License, or
     9  (at your option) any later version.
    10  
    11  This program is distributed in the hope that it will be useful
    12  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  GNU Affero General Public License for more details.
    15  
    16  You should have received a copy of the GNU Affero General Public License
    17  along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18  */
    19  
    20  package operations
    21  
    22  import (
    23  	"context"
    24  	"fmt"
    25  
    26  	"github.com/pkg/errors"
    27  
    28  	"github.com/1aal/kubeblocks/pkg/lorry/dcs"
    29  	"github.com/1aal/kubeblocks/pkg/lorry/engines/register"
    30  )
    31  
    32  type Switchover struct {
    33  	Base
    34  	dcsStore dcs.DCS
    35  }
    36  
    37  var switchover Operation = &Switchover{}
    38  
    39  func init() {
    40  	err := Register("switchover", switchover)
    41  	if err != nil {
    42  		panic(err.Error())
    43  	}
    44  }
    45  
    46  func (s *Switchover) Init(ctx context.Context) error {
    47  	s.dcsStore = dcs.GetStore()
    48  	if s.dcsStore == nil {
    49  		return errors.New("dcs store init failed")
    50  	}
    51  
    52  	return nil
    53  }
    54  
    55  func (s *Switchover) PreCheck(ctx context.Context, req *OpsRequest) error {
    56  	primary := req.Parameters["primary"].(string)
    57  	candidate := req.Parameters["candidate"].(string)
    58  	if primary == "" && candidate == "" {
    59  		return errors.New("primary or candidate must be set")
    60  	}
    61  
    62  	cluster, err := s.dcsStore.GetCluster()
    63  	if cluster == nil {
    64  		return errors.Wrap(err, "get cluster failed")
    65  	}
    66  
    67  	manager, err := register.GetDBManager()
    68  	if err != nil {
    69  		return errors.Wrap(err, "get manager failed")
    70  	}
    71  
    72  	if primary != "" {
    73  		leaderMember := cluster.GetMemberWithName(primary)
    74  		if leaderMember == nil {
    75  			message := fmt.Sprintf("primary %s not exists", primary)
    76  			return errors.New(message)
    77  		}
    78  
    79  		if ok, err := manager.IsLeaderMember(ctx, cluster, leaderMember); err != nil || !ok {
    80  			message := fmt.Sprintf("%s is not the primary", primary)
    81  			return errors.New(message)
    82  		}
    83  	}
    84  
    85  	if candidate != "" {
    86  		candidateMember := cluster.GetMemberWithName(candidate)
    87  		if candidateMember == nil {
    88  			message := fmt.Sprintf("candidate %s not exists", candidate)
    89  			return errors.New(message)
    90  		}
    91  
    92  		if !manager.IsMemberHealthy(ctx, cluster, candidateMember) {
    93  			message := fmt.Sprintf("candidate %s is unhealthy", candidate)
    94  			return errors.New(message)
    95  		}
    96  	} else if len(manager.HasOtherHealthyMembers(ctx, cluster, primary)) == 0 {
    97  		return errors.New("candidate is not set and has no other healthy members")
    98  	}
    99  
   100  	return nil
   101  }
   102  
   103  func (s *Switchover) Do(ctx context.Context, req *OpsRequest) (*OpsResponse, error) {
   104  	primary := req.Parameters["primary"].(string)
   105  	candidate := req.Parameters["candidate"].(string)
   106  	err := s.dcsStore.CreateSwitchover(primary, candidate)
   107  	if err != nil {
   108  		message := fmt.Sprintf("Create switchover failed: %v", err)
   109  		return nil, errors.New(message)
   110  	}
   111  
   112  	return nil, nil
   113  }