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object_store.go
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object_store.go
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package adapter
import (
"encoding/binary"
"encoding/json"
"fmt"
"go/ast"
"reflect"
"github.com/adonmo/goroom/orm"
"github.com/adonmo/goroom/room"
bolt "go.etcd.io/bbolt"
)
//ObjectDataField Representation
type ObjectDataField struct {
Name string
Tag reflect.StructTag
}
//ObjectStoreEntityModel Entity Model for GORM for Room
type ObjectStoreEntityModel struct {
Fields []*ObjectDataField
}
//ObjectStoreORMAdapter Adapter for BoltDB to work with Room
type ObjectStoreORMAdapter struct {
db *bolt.DB
currentTx *bolt.Tx
}
//NewORMAdapter Constructor
func NewORMAdapter(db *bolt.DB) *ObjectStoreORMAdapter {
return &ObjectStoreORMAdapter{
db: db,
}
}
//NewORMAdapterForTransaction Constructor
func NewORMAdapterForTransaction(db *bolt.DB, currentTx *bolt.Tx) *ObjectStoreORMAdapter {
return &ObjectStoreORMAdapter{
db: db,
currentTx: currentTx,
}
}
//GetBucketForEntity Namesake
func (oAdap *ObjectStoreORMAdapter) GetBucketForEntity(entity interface{}, tx *bolt.Tx) (bucket *bolt.Bucket) {
modelDef := oAdap.GetModelDefinition(entity)
if isValidModel(modelDef) {
if tx == nil {
tx = oAdap.currentTx
}
bucket = tx.Bucket([]byte(modelDef.TableName))
}
return
}
//HasTable Check if a table for the given entity exists
func (oAdap *ObjectStoreORMAdapter) HasTable(entity interface{}) bool {
var bucket *bolt.Bucket
if oAdap.currentTx == nil {
oAdap.db.View(func(tx *bolt.Tx) error {
bucket = oAdap.GetBucketForEntity(entity, tx)
return nil
})
} else {
bucket = oAdap.GetBucketForEntity(entity, nil)
}
return bucket != nil
}
//CreateTable Create tables for given entities
func (oAdap *ObjectStoreORMAdapter) CreateTable(entities ...interface{}) orm.Result {
var resultErr error
for _, entity := range entities {
modelDef := oAdap.GetModelDefinition(entity)
if isValidModel(modelDef) {
bucket, err := oAdap.currentTx.CreateBucket([]byte(modelDef.TableName))
if err != nil || bucket == nil {
resultErr = fmt.Errorf("Unable to create bucket for %+v", modelDef)
}
} else {
resultErr = fmt.Errorf("Invalid Model Def: %+v", modelDef)
}
}
return orm.Result{
Error: resultErr,
}
}
//TruncateTable Clear out a table
func (oAdap *ObjectStoreORMAdapter) TruncateTable(entity interface{}) orm.Result {
var resultErr error
bucket := oAdap.GetBucketForEntity(entity, nil)
if bucket == nil {
resultErr = fmt.Errorf("No table for entity")
}
keyList := [][]byte{}
bucket.ForEach(func(k, v []byte) error {
keyList = append(keyList, k)
return nil
})
for _, k := range keyList {
bucket.Delete(k)
}
return orm.Result{
Error: resultErr,
}
}
//Create Add the entity to the table
func (oAdap *ObjectStoreORMAdapter) Create(entity interface{}) orm.Result {
bucket := oAdap.GetBucketForEntity(entity, nil)
if bucket == nil {
return orm.Result{
Error: fmt.Errorf("No table for entity"),
}
}
nextSeq, err := bucket.NextSequence()
if err != nil {
return orm.Result{
Error: err,
}
}
nextID := int(nextSeq)
entityVal := reflect.ValueOf(entity)
val := reflect.Indirect(entityVal).FieldByName("ID")
if val.IsValid() && val.CanSet() && val.Kind() == reflect.Int {
val.SetInt(int64(nextID))
}
buf, err := json.Marshal(entity)
if err != nil {
return orm.Result{
Error: err,
}
}
bucket.Put(Itob(nextID), buf)
return orm.Result{
Error: nil,
}
}
//Itob Convert integer to bytes
func Itob(v int) []byte {
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, uint64(v))
return b
}
//DropTable Drop a table
func (oAdap *ObjectStoreORMAdapter) DropTable(entities ...interface{}) orm.Result {
for _, entity := range entities {
modelDef := oAdap.GetModelDefinition(entity)
err := oAdap.currentTx.DeleteBucket([]byte(modelDef.TableName))
if err != nil {
return orm.Result{
Error: err,
}
}
}
return orm.Result{
Error: nil,
}
}
//GetModelDefinition Gives model definition of a given database entity
func (oAdap *ObjectStoreORMAdapter) GetModelDefinition(entity interface{}) (modelDefinition orm.ModelDefinition) {
reflectType, err := getReflectTypeForEntity(entity)
if err != nil {
return
}
fields := make([]*ObjectDataField, 0, reflectType.NumField())
for i := 0; i < reflectType.NumField(); i++ {
if fieldStruct := reflectType.Field(i); ast.IsExported(fieldStruct.Name) {
fields = append(fields, &ObjectDataField{
Name: fieldStruct.Name + ":" + fieldStruct.Type.Name(),
Tag: fieldStruct.Tag,
})
}
}
return orm.ModelDefinition{
EntityModel: &ObjectStoreEntityModel{
Fields: fields,
},
TableName: reflectType.Name(),
}
}
//GetUnderlyingORM Returns the underlying DB object
func (oAdap *ObjectStoreORMAdapter) GetUnderlyingORM() interface{} {
return oAdap.currentTx
}
//GetLatestSchemaIdentityHashAndVersion Get latest metadata for Room
func (oAdap *ObjectStoreORMAdapter) GetLatestSchemaIdentityHashAndVersion() (identityHash string, version int, err error) {
var latestMetadata *room.GoRoomSchemaMaster
if oAdap.currentTx == nil {
err = oAdap.db.View(func(tx *bolt.Tx) error {
latestMetadata, err = oAdap.getLatestRoomMetadata(tx)
return err
})
} else {
latestMetadata, err = oAdap.getLatestRoomMetadata(oAdap.currentTx)
}
if err != nil {
return
}
if latestMetadata != nil {
identityHash = latestMetadata.IdentityHash
version = int(latestMetadata.Version)
}
return
}
func (oAdap *ObjectStoreORMAdapter) getLatestRoomMetadata(tx *bolt.Tx) (latestMetadata *room.GoRoomSchemaMaster, err error) {
bucket := oAdap.GetBucketForEntity(room.GoRoomSchemaMaster{}, tx)
if bucket == nil {
err = fmt.Errorf("No such table")
return
}
err = bucket.ForEach(func(k, v []byte) error {
metadata := room.GoRoomSchemaMaster{}
err := json.Unmarshal(v, &metadata)
if err != nil {
return err
}
latestMetadata = &metadata
return nil
})
return
}
//DoInTransaction Runs the DB operations in a single transaction
func (oAdap *ObjectStoreORMAdapter) DoInTransaction(fc func(wrappedORM orm.ORM) error) (err error) {
boltTransactionFunc := func(tx *bolt.Tx) error {
return fc(NewORMAdapterForTransaction(tx.DB(), tx))
}
return oAdap.db.Update(boltTransactionFunc)
}