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dbmanager.go
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dbmanager.go
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/*
Copyright (C) 2022-2023 ApeCloud Co., Ltd
This file is part of KubeBlocks project
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package component
import (
"context"
"fmt"
"strings"
"github.com/go-logr/logr"
"github.com/pkg/errors"
"github.com/apecloud/kubeblocks/lorry/dcs"
"github.com/apecloud/kubeblocks/pkg/constant"
viper "github.com/apecloud/kubeblocks/pkg/viperx"
)
type DBManager interface {
IsRunning() bool
IsDBStartupReady() bool
// Functions related to cluster initialization.
InitializeCluster(context.Context, *dcs.Cluster) error
IsClusterInitialized(context.Context, *dcs.Cluster) (bool, error)
// IsCurrentMemberInCluster checks if current member is configured in cluster for consensus.
// it will always return true for replicationset.
IsCurrentMemberInCluster(context.Context, *dcs.Cluster) bool
// IsClusterHealthy is only for consensus cluster healthy check.
// For Replication cluster IsClusterHealthy will always return true,
// and its cluster's healthy is equal to leader member's healthy.
IsClusterHealthy(context.Context, *dcs.Cluster) bool
// Member healthy check
// IsMemberHealthy focuses on the database's read and write capabilities.
IsMemberHealthy(context.Context, *dcs.Cluster, *dcs.Member) bool
IsCurrentMemberHealthy(context.Context, *dcs.Cluster) bool
// IsMemberLagging focuses on the latency between the leader and standby
IsMemberLagging(context.Context, *dcs.Cluster, *dcs.Member) (bool, int64)
// GetDBState will get most required database kernel states of current member in one HA loop to Avoiding duplicate queries and conserve I/O.
// We believe that the states of database kernel remains unchanged within a single HA loop.
GetDBState(context.Context, *dcs.Cluster) *dcs.DBState
// HasOtherHealthyLeader is applicable only to consensus cluster,
// where the db's internal role services as the source of truth.
// for replicationset cluster, HasOtherHealthyLeader will always be nil.
HasOtherHealthyLeader(context.Context, *dcs.Cluster) *dcs.Member
HasOtherHealthyMembers(context.Context, *dcs.Cluster, string) []*dcs.Member
// Functions related to member check.
IsLeader(context.Context, *dcs.Cluster) (bool, error)
IsLeaderMember(context.Context, *dcs.Cluster, *dcs.Member) (bool, error)
IsFirstMember() bool
JoinCurrentMemberToCluster(context.Context, *dcs.Cluster) error
LeaveMemberFromCluster(context.Context, *dcs.Cluster, string) error
// IsPromoted is applicable only to consensus cluster, which is used to
// check if DB has complete switchover.
// for replicationset cluster, it will always be true.
IsPromoted(context.Context) bool
// Functions related to HA
// The functions should be idempotent, indicating that if they have been executed in one ha cycle,
// any subsequent calls during that cycle will have no effect.
Promote(context.Context, *dcs.Cluster) error
Demote(context.Context) error
Follow(context.Context, *dcs.Cluster) error
Recover(context.Context) error
// Start and Stop just send signal to sqlChannel
Start(context.Context, *dcs.Cluster) error
Stop() error
GetHealthiestMember(*dcs.Cluster, string) *dcs.Member
// IsHealthiestMember(*dcs.Cluster) bool
GetCurrentMemberName() string
GetMemberAddrs(context.Context, *dcs.Cluster) []string
// Functions related to account manage
IsRootCreated(context.Context) (bool, error)
CreateRoot(context.Context) error
// Readonly lock for disk full
Lock(context.Context, string) error
Unlock(context.Context) error
MoveData(context.Context, *dcs.Cluster) error
GetLogger() logr.Logger
ShutDownWithWait()
}
var managers = make(map[string]DBManager)
type DBManagerBase struct {
CurrentMemberName string
ClusterCompName string
Namespace string
DataDir string
Logger logr.Logger
DBStartupReady bool
IsLocked bool
DBState *dcs.DBState
}
func (mgr *DBManagerBase) IsDBStartupReady() bool {
return mgr.DBStartupReady
}
func (mgr *DBManagerBase) GetLogger() logr.Logger {
return mgr.Logger
}
func (mgr *DBManagerBase) GetCurrentMemberName() string {
return mgr.CurrentMemberName
}
func (mgr *DBManagerBase) IsFirstMember() bool {
return strings.HasSuffix(mgr.CurrentMemberName, "-0")
}
func (mgr *DBManagerBase) IsPromoted(context.Context) bool {
return true
}
func (mgr *DBManagerBase) IsClusterHealthy(context.Context, *dcs.Cluster) bool {
return true
}
func (mgr *DBManagerBase) HasOtherHealthyLeader(context.Context, *dcs.Cluster) *dcs.Member {
return nil
}
func (mgr *DBManagerBase) IsMemberLagging(context.Context, *dcs.Cluster, *dcs.Member) (bool, int64) {
return false, 0
}
func (mgr *DBManagerBase) GetDBState(context.Context, *dcs.Cluster) *dcs.DBState {
// mgr.DBState = DBState
return nil
}
func (mgr *DBManagerBase) MoveData(context.Context, *dcs.Cluster) error {
return nil
}
func (mgr *DBManagerBase) Demote(context.Context) error {
return nil
}
func (mgr *DBManagerBase) Follow(context.Context, *dcs.Cluster) error {
return nil
}
func (mgr *DBManagerBase) IsRootCreated(context.Context) (bool, error) {
return true, nil
}
func (mgr *DBManagerBase) Start(context.Context, *dcs.Cluster) error {
return nil
}
func (mgr *DBManagerBase) Stop() error {
return nil
}
func (mgr *DBManagerBase) CreateRoot(context.Context) error {
return nil
}
func (mgr *DBManagerBase) ShutDownWithWait() {
mgr.Logger.Info("Override me if need")
}
func (*DBManagerBase) JoinCurrentMemberToCluster(context.Context, *dcs.Cluster) error {
return nil
}
func (*DBManagerBase) LeaveMemberFromCluster(context.Context, *dcs.Cluster, string) error {
return nil
}
func RegisterManager(characterType, workloadType string, manager DBManager) {
key := strings.ToLower(characterType + "_" + workloadType)
managers[key] = manager
}
func GetManager(characterType, workloadType string) DBManager {
key := strings.ToLower(characterType + "_" + workloadType)
return managers[key]
}
func GetDefaultManager() (DBManager, error) {
characterType := viper.GetString("KB_SERVICE_CHARACTER_TYPE")
if characterType == "" {
return nil, fmt.Errorf("KB_SERVICE_CHARACTER_TYPE not set")
}
workloadType := viper.GetString(constant.KBEnvWorkloadType)
if workloadType == "" {
return nil, fmt.Errorf("%s not set", constant.KBEnvWorkloadType)
}
manager := GetManager(characterType, workloadType)
if manager == nil {
return nil, errors.Errorf("no db manager for characterType %s and workloadType %s", characterType, workloadType)
}
return manager, nil
}
type FakeManager struct {
DBManagerBase
}
var _ DBManager = &FakeManager{}
func (*FakeManager) IsRunning() bool {
return true
}
func (*FakeManager) IsDBStartupReady() bool {
return true
}
func (*FakeManager) InitializeCluster(context.Context, *dcs.Cluster) error {
return fmt.Errorf("NotSupported")
}
func (*FakeManager) IsClusterInitialized(context.Context, *dcs.Cluster) (bool, error) {
return false, fmt.Errorf("NotSupported")
}
func (*FakeManager) IsCurrentMemberInCluster(context.Context, *dcs.Cluster) bool {
return true
}
func (*FakeManager) IsCurrentMemberHealthy(context.Context, *dcs.Cluster) bool {
return true
}
func (*FakeManager) IsClusterHealthy(context.Context, *dcs.Cluster) bool {
return true
}
func (*FakeManager) IsMemberHealthy(context.Context, *dcs.Cluster, *dcs.Member) bool {
return true
}
func (*FakeManager) HasOtherHealthyLeader(context.Context, *dcs.Cluster) *dcs.Member {
return nil
}
func (*FakeManager) HasOtherHealthyMembers(context.Context, *dcs.Cluster, string) []*dcs.Member {
return nil
}
func (*FakeManager) IsLeader(context.Context, *dcs.Cluster) (bool, error) {
return false, fmt.Errorf("NotSupported")
}
func (*FakeManager) IsLeaderMember(context.Context, *dcs.Cluster, *dcs.Member) (bool, error) {
return false, fmt.Errorf("NotSupported")
}
func (*FakeManager) IsFirstMember() bool {
return true
}
func (*FakeManager) JoinCurrentMemberToCluster(context.Context, *dcs.Cluster) error {
return nil
}
func (*FakeManager) LeaveMemberFromCluster(context.Context, *dcs.Cluster, string) error {
return nil
}
func (*FakeManager) Promote(context.Context, *dcs.Cluster) error {
return fmt.Errorf("NotSupported")
}
func (*FakeManager) IsPromoted(context.Context) bool {
return true
}
func (*FakeManager) Demote(context.Context) error {
return fmt.Errorf("NotSuppported")
}
func (*FakeManager) Follow(context.Context, *dcs.Cluster) error {
return fmt.Errorf("NotSupported")
}
func (*FakeManager) Recover(context.Context) error {
return nil
}
func (*FakeManager) GetHealthiestMember(*dcs.Cluster, string) *dcs.Member {
return nil
}
func (*FakeManager) GetMemberAddrs(context.Context, *dcs.Cluster) []string {
return nil
}
func (*FakeManager) IsRootCreated(context.Context) (bool, error) {
return false, fmt.Errorf("NotSupported")
}
func (*FakeManager) CreateRoot(context.Context) error {
return fmt.Errorf("NotSupported")
}
func (*FakeManager) Lock(context.Context, string) error {
return fmt.Errorf("NotSuppported")
}
func (*FakeManager) Unlock(context.Context) error {
return fmt.Errorf("NotSuppported")
}