/
database.go
83 lines (67 loc) · 1.48 KB
/
database.go
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// Package database provides database primitives such as tables, transactions and indexes.
package database
import (
"sync"
"github.com/asdine/genji/engine"
)
// A Database manages a list of tables in an engine.
type Database struct {
ng engine.Engine
mu sync.Mutex
}
// New initializes the DB using the given engine.
func New(ng engine.Engine) (*Database, error) {
db := Database{
ng: ng,
}
ntx, err := db.ng.Begin(true)
if err != nil {
return nil, err
}
defer ntx.Rollback()
_, err = ntx.GetStore(tableConfigStoreName)
if err == engine.ErrStoreNotFound {
err = ntx.CreateStore(tableConfigStoreName)
}
if err != nil {
return nil, err
}
_, err = ntx.GetStore(indexStoreName)
if err == engine.ErrStoreNotFound {
err = ntx.CreateStore(indexStoreName)
}
if err != nil {
return nil, err
}
err = ntx.Commit()
if err != nil {
return nil, err
}
return &db, nil
}
// Close the underlying engine.
func (db *Database) Close() error {
return db.ng.Close()
}
// Begin starts a new transaction.
// The returned transaction must be closed either by calling Rollback or Commit.
func (db *Database) Begin(writable bool) (*Transaction, error) {
ntx, err := db.ng.Begin(writable)
if err != nil {
return nil, err
}
tx := Transaction{
db: db,
Tx: ntx,
writable: writable,
}
tx.tcfgStore, err = tx.getTableConfigStore()
if err != nil {
return nil, err
}
tx.indexStore, err = tx.getIndexStore()
if err != nil {
return nil, err
}
return &tx, nil
}