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package svc // import "github.com/getwtxt/getwtxt/svc"
import (
"github.com/syndtr/goleveldb/leveldb"
"golang.org/x/sys/unix"
)
// Everything in this file is database-agnostic.
// Functions and types related to specific kinds
// of databases will be in their own respective
// files, such as:
// - leveldb.go
// - sqlite.go
// Abstraction to allow several different
// databases to be used interchangeably.
type dbase interface {
push() error
pull()
}
// Opens a new connection to the specified
// database, then reads it into memory.
func initDatabase() {
var db dbase
confObj.Mu.RLock()
dbpath := confObj.DBPath
confObj.Mu.RUnlock()
switch confObj.DBType {
case "leveldb":
lvl, err := leveldb.OpenFile(dbpath, nil)
errFatal("", err)
db = &dbLevel{db: lvl}
case "sqlite":
db = initSqlite()
}
dbChan <- db
pullDB()
}
// Close the database connection.
func killDB() {
db := <-dbChan
switch dbType := db.(type) {
case *dbLevel:
errLog("", dbType.db.Close())
case *dbSqlite:
errLog("", dbType.db.Close())
}
}
// Pushes the registry's cache data
// to a local database for safe keeping.
func pushDB() error {
db := <-dbChan
err := db.push()
dbChan <- db
unix.Sync()
return err
}
// Reads the database from disk into memory.
func pullDB() {
db := <-dbChan
db.pull()
dbChan <- db
}
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