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sqlite_adapter.go
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sqlite_adapter.go
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package storage
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"fmt"
"time"
"gorm.io/driver/sqlite" // Sqlite driver based on GGO
// "github.com/glebarez/sqlite" // Pure go SQLite driver, checkout https://github.com/glebarez/sqlite for details
"gorm.io/gorm"
)
type ChangeCount map[string]int32
// Scan implements the Scanner interface.
func (n *ChangeCount) Scan(value any) error {
b, ok := value.([]byte)
if !ok {
return fmt.Errorf("convert value to []byte failed")
}
return json.Unmarshal(b, n)
}
// Value implements the driver Valuer interface.
func (n ChangeCount) Value() (driver.Value, error) {
return json.Marshal(n)
}
// TODO able to open sqlite for readonly?
// is_deleted || is_discarded can be removed from storage any time
type DBRecord struct {
Key string `gorm:"index;column:key"`
Value string `gorm:"column:value"`
MachineID string `gorm:"column:machine_id"`
Offset int64 `gorm:"column:offset"`
PrevMachineID string `gorm:"column:prev_machine_id"`
Seq uint64 `gorm:"column:seq"`
CurrentLogGid string `gorm:"uniqueIndex;column:gid"`
PrevLogGid string `gorm:"column:prev_log_gid"`
IsDiscarded bool `gorm:"column:is_discarded"`
IsDeleted bool `gorm:"column:is_deleted"`
MachineChangeCount ChangeCount `gorm:"column:change_count"`
Num int64 `gorm:"num"`
PrevNum int64 `gorm:"prev_num"`
CreatedAt time.Time
UpdatedAt time.Time
DeletedAt sql.NullTime `gorm:"index"`
}
// call newLogProgress to make instance
type LogProgress struct {
Offset int64 `gorm:"column:offset"` // HeaderSize should be used as initial value
Num int64 `gorm:"column:num"`
Gid string `gorm:"column:gid"`
MachineID string `gorm:"uniqueIndex;column:machine_id"`
CreatedAt time.Time
UpdatedAt time.Time
DeletedAt sql.NullTime `gorm:"index"`
}
func newLogProgress(machineID string) *LogProgress {
return &LogProgress{MachineID: machineID, Offset: HeaderSize}
}
func (r *DBRecord) Visible() bool {
return !r.IsDeleted && !r.IsDiscarded
}
func (r *DBRecord) Changes(machineID string) int32 {
if r.MachineChangeCount == nil {
return 0
}
if changes, ok := r.MachineChangeCount[machineID]; ok {
return changes
}
return 0
}
func (r *DBRecord) AddChange(machineID string, changes int32) map[string]int32 {
m := make(map[string]int32)
if r.MachineChangeCount != nil {
for k, v := range r.MachineChangeCount {
m[k] = v
}
}
m[machineID] += changes
return m
}
// SqliteAdapter ...
type SqliteAdapter struct {
db *gorm.DB
workingDB *gorm.DB
}
func (s *SqliteAdapter) Transaction(f func(s *SqliteAdapter) error) error {
return s.workingDB.Transaction(func(tx *gorm.DB) error {
return f(&SqliteAdapter{db: s.db, workingDB: tx})
})
}
func (s *SqliteAdapter) Init(dbFile string) error {
l := gormLoggerImpl{}
l.Init(logger)
db, err := gorm.Open(sqlite.Open(dbFile), &gorm.Config{
SkipDefaultTransaction: true,
Logger: &l,
})
if err != nil {
return err
}
err = db.AutoMigrate(&DBRecord{})
if err != nil {
return err
}
err = db.AutoMigrate(&LogProgress{})
if err != nil {
return err
}
s.db = db
s.workingDB = db
return nil
}
func (s *SqliteAdapter) Close() error {
if s.db != nil {
db, err := s.db.DB()
if err != nil {
return err
}
err = db.Close()
if err != nil {
return err
}
s.db = nil
}
return nil
}
func (s *SqliteAdapter) updateLogProgress(progress *LogProgress) error {
records := []*LogProgress{}
result := s.workingDB.Model(&LogProgress{}).Find(&records, "machine_id = ?", progress.MachineID)
if result.Error != nil {
return result.Error
}
if result.RowsAffected > 0 {
return s.workingDB.Model(&LogProgress{}).Where("machine_id = ?", progress.MachineID).Updates(progress).Error
} else {
return s.workingDB.Model(&LogProgress{}).Create(progress).Error
}
}
//TODO: whether to have soft deletion enabled
func (s *SqliteAdapter) Has(gid string) (bool, error) {
records := []DBRecord{}
result := s.workingDB.Model(&DBRecord{}).Find(&records, "gid = ?", gid)
if result.Error != nil {
return false, result.Error
}
return result.RowsAffected > 0, nil
}
func (s *SqliteAdapter) Add(record *DBRecord) error {
has, err := s.Has(record.CurrentLogGid)
if err != nil {
return err
}
if has {
return fmt.Errorf("node exists")
}
return s.Transaction(func(s2 *SqliteAdapter) error {
if err := s2.workingDB.Model(&DBRecord{}).Create(record).Error; err != nil {
return err
}
return s2.updateLogProgress(&LogProgress{MachineID: record.MachineID, Offset: record.Offset,
Gid: record.CurrentLogGid, Num: record.Num})
})
}
func (s *SqliteAdapter) Replace(old string, new *DBRecord) error {
has, err := s.Has(old)
if err != nil {
return err
}
if !has {
return fmt.Errorf("node not exist")
}
has, err = s.Has(new.CurrentLogGid)
if err != nil {
return err
}
if has {
return fmt.Errorf("new node already exist")
}
return s.Transaction(func(s2 *SqliteAdapter) error {
if err := s2.delNode(old); err != nil {
return err
}
if err := s2.workingDB.Model(&DBRecord{}).Create(new).Error; err != nil {
return err
}
return s2.updateLogProgress(&LogProgress{MachineID: new.MachineID, Offset: new.Offset,
Gid: new.CurrentLogGid, Num: new.Num})
})
}
func (s *SqliteAdapter) delNode(gid string) error {
return s.workingDB.Model(&DBRecord{}).Where("gid = ?", gid).Delete(&DBRecord{CurrentLogGid: gid}).Error
}
func (s *SqliteAdapter) GetByKey(key string) ([]*DBRecord, error) {
records := []*DBRecord{}
result := s.workingDB.Model(&DBRecord{}).Where("key = ?", key).Find(&records)
if result.Error != nil {
return nil, result.Error
}
return records, nil
}
func (s *SqliteAdapter) GetByGid(gid string) (*DBRecord, error) {
rec := DBRecord{}
result := s.workingDB.Model(&DBRecord{}).Where("gid = ?", gid).First(&rec)
if result.Error != nil {
return nil, result.Error
}
return &rec, nil
}
func (s *SqliteAdapter) AllNodes() ([]*DBRecord, error) {
records := []*DBRecord{}
result := s.workingDB.Model(&DBRecord{}).Find(&records)
if result.Error != nil {
return nil, result.Error
}
return records, nil
}
func (s *SqliteAdapter) Processes() ([]*LogProgress, error) {
records := []*LogProgress{}
result := s.workingDB.Model(&LogProgress{}).Find(&records)
if result.Error != nil {
return nil, result.Error
}
return records, nil
}
func (s *SqliteAdapter) Merge(other ReadOnlyNodeStorage) error {
return fmt.Errorf("unsupported")
}
func _() {
var _ NodeStorage = &SqliteAdapter{}
}