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feature_flag_mysql.go
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feature_flag_mysql.go
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package featureflag
import (
"errors"
"fmt"
"github.com/latolukasz/beeorm"
"github.com/coretrix/hitrix/pkg/entity"
"github.com/coretrix/hitrix/service/component/app"
"github.com/coretrix/hitrix/service/component/clock"
errorlogger "github.com/coretrix/hitrix/service/component/error_logger"
)
type IFeatureFlag interface {
GetName() string
ScriptsSingleInstance() []app.IScript
ScriptsMultiInstance() []app.IScript
}
type serviceFeatureFlag struct {
featureFlags map[string]IFeatureFlag
errorLoggerService errorlogger.ErrorLogger
}
func NewFeatureFlagService(errorLoggerService errorlogger.ErrorLogger) ServiceFeatureFlagInterface {
featureFlags := make(map[string]IFeatureFlag)
return &serviceFeatureFlag{
featureFlags: featureFlags,
errorLoggerService: errorLoggerService,
}
}
func (s *serviceFeatureFlag) IsActive(ormService *beeorm.Engine, name string) bool {
if name == "" {
panic("name cannot be empty")
}
query := beeorm.NewRedisSearchQuery()
query.FilterString("Name", name)
featureFlagEntity := &entity.FeatureFlagEntity{}
found := ormService.RedisSearchOne(featureFlagEntity, query)
if !found {
return false
}
return featureFlagEntity.Enabled && featureFlagEntity.Registered
}
func (s *serviceFeatureFlag) FailIfIsNotActive(ormService *beeorm.Engine, name string) error {
isActive := s.IsActive(ormService, name)
if !isActive {
return fmt.Errorf("feature (%s) is not active", name)
}
return nil
}
func (s *serviceFeatureFlag) Enable(ormService *beeorm.Engine, name string) error {
if name == "" {
panic("name cannot be empty")
}
query := beeorm.NewRedisSearchQuery()
query.FilterString("Name", name)
featureFlagEntity := &entity.FeatureFlagEntity{}
found := ormService.RedisSearchOne(featureFlagEntity, query)
if !found {
return errors.New("feature cannot be found")
}
featureFlagEntity.Enabled = true
ormService.Flush(featureFlagEntity)
return nil
}
func (s *serviceFeatureFlag) Disable(ormService *beeorm.Engine, name string) error {
if name == "" {
panic("name cannot be empty")
}
query := beeorm.NewRedisSearchQuery()
query.FilterString("Name", name)
featureFlagEntity := &entity.FeatureFlagEntity{}
found := ormService.RedisSearchOne(featureFlagEntity, query)
if !found {
return errors.New("feature cannot be found")
}
featureFlagEntity.Enabled = false
ormService.Flush(featureFlagEntity)
return nil
}
func (s *serviceFeatureFlag) getAllActive(ormService *beeorm.Engine, pager *beeorm.Pager) []IFeatureFlag {
query := beeorm.NewRedisSearchQuery()
query.FilterBool("Registered", true)
query.FilterBool("Enabled", true)
var featureFlagEntities []*entity.FeatureFlagEntity
ormService.RedisSearch(&featureFlagEntities, query, pager)
activeFeatureFlags := make([]IFeatureFlag, 0)
for _, featureFlagEntity := range featureFlagEntities {
if _, ok := s.featureFlags[featureFlagEntity.Name]; !ok {
s.errorLoggerService.LogError("feature flag " + featureFlagEntity.Name + " is not registered")
continue
}
activeFeatureFlags = append(activeFeatureFlags, s.featureFlags[featureFlagEntity.Name])
}
return activeFeatureFlags
}
func (s *serviceFeatureFlag) GetScriptsSingleInstance(ormService *beeorm.Engine) []app.IScript {
activeFeatureFlags := s.getAllActive(ormService, beeorm.NewPager(1, 1000))
allScripts := make([]app.IScript, 0)
for _, featureFlag := range activeFeatureFlags {
allScripts = append(allScripts, featureFlag.ScriptsSingleInstance()...)
}
return allScripts
}
func (s *serviceFeatureFlag) GetScriptsMultiInstance(ormService *beeorm.Engine) []app.IScript {
activeFeatureFlags := s.getAllActive(ormService, beeorm.NewPager(1, 1000))
allScripts := make([]app.IScript, 0)
for _, featureFlag := range activeFeatureFlags {
allScripts = append(allScripts, featureFlag.ScriptsMultiInstance()...)
}
return allScripts
}
func (s *serviceFeatureFlag) Register(featureFlags ...IFeatureFlag) {
s.featureFlags = make(map[string]IFeatureFlag)
for _, featureFlag := range featureFlags {
if _, has := s.featureFlags[featureFlag.GetName()]; has {
panic("feature flag with name '" + featureFlag.GetName() + "' already exists")
}
s.featureFlags[featureFlag.GetName()] = featureFlag
}
}
func (s *serviceFeatureFlag) Sync(ormService *beeorm.Engine, clockService clock.IClock) {
var featureFlagEntities []*entity.FeatureFlagEntity
var lastID uint64
for {
var rows []*entity.FeatureFlagEntity
pager := beeorm.NewPager(1, 1000)
ormService.Search(beeorm.NewWhere("ID > ? ORDER BY ID ASC", lastID), pager, &rows)
if len(rows) == 0 {
break
}
lastID = rows[len(rows)-1].ID
featureFlagEntities = append(featureFlagEntities, rows...)
if len(rows) < pager.PageSize {
break
}
}
flusher := ormService.NewFlusher()
dbFeatureFlags := make(map[string]*entity.FeatureFlagEntity)
for _, featureFlagEntity := range featureFlagEntities {
if featureFlagEntity != nil {
dbFeatureFlags[featureFlagEntity.Name] = featureFlagEntity
} else {
s.errorLoggerService.LogError("feature flag is nil")
}
}
for _, registeredFeatureFlag := range s.featureFlags {
if _, ok := dbFeatureFlags[registeredFeatureFlag.GetName()]; !ok {
featureFlagEntity := &entity.FeatureFlagEntity{
Name: registeredFeatureFlag.GetName(),
Registered: true,
Enabled: false,
UpdatedAt: nil,
CreatedAt: clockService.Now(),
}
err := ormService.FlushWithCheck(featureFlagEntity)
if err != nil {
if duplicateKeyError, ok := err.(*beeorm.DuplicatedKeyError); ok {
if duplicateKeyError.Index != "Name" {
panic(err)
}
} else {
panic(err)
}
}
} else if !dbFeatureFlags[registeredFeatureFlag.GetName()].Registered {
dbFeatureFlags[registeredFeatureFlag.GetName()].Registered = true
dbFeatureFlags[registeredFeatureFlag.GetName()].UpdatedAt = clockService.NowPointer()
flusher.Track(dbFeatureFlags[registeredFeatureFlag.GetName()])
}
}
for name, dbFeatureFlag := range dbFeatureFlags {
if _, ok := s.featureFlags[name]; !ok {
dbFeatureFlag.Registered = false
dbFeatureFlag.UpdatedAt = clockService.NowPointer()
flusher.Track(dbFeatureFlag)
}
}
flusher.Flush()
}