103 lines
2.1 KiB
Go
103 lines
2.1 KiB
Go
// This is a centralized place to connect to the database, and hold a reference to it.
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// Other packages can share this reference. This package would also be a place to add any kind of
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// persistence-related convenience methods or migrations.
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package data
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import (
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"database/sql"
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"fmt"
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"os"
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"github.com/owncast/owncast/config"
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"github.com/owncast/owncast/utils"
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log "github.com/sirupsen/logrus"
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)
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const (
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schemaVersion = 0
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)
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var _db *sql.DB
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func GetDatabase() *sql.DB {
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return _db
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}
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func SetupPersistence() error {
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file := config.Config.DatabaseFilePath
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// Create empty DB file if it doesn't exist.
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if !utils.DoesFileExists(file) {
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log.Traceln("Creating new database at", file)
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_, err := os.Create(file)
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if err != nil {
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log.Fatal(err.Error())
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}
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}
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db, err := sql.Open("sqlite3", file)
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if err != nil {
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return err
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}
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if _, err := db.Exec(`CREATE TABLE IF NOT EXISTS config (
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"key" string NOT NULL PRIMARY KEY,
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"value" TEXT
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);`); err != nil {
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return err
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}
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var version int
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err = db.QueryRow("SELECT value FROM config WHERE key='version'").
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Scan(&version)
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if err != nil {
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if err != sql.ErrNoRows {
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return err
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}
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// fresh database: initialize it with the current schema version
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_, err := db.Exec("INSERT INTO config(key, value) VALUES(?, ?)", "version", schemaVersion)
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if err != nil {
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return err
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}
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version = schemaVersion
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}
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// is database from a newer Owncast version?
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if version > schemaVersion {
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return fmt.Errorf("incompatible database version %d (versions up to %d are supported)",
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version, schemaVersion)
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}
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// is database schema outdated?
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if version < schemaVersion {
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if err := migrateDatabase(db, version, schemaVersion); err != nil {
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return err
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}
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}
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_db = db
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return nil
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}
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func migrateDatabase(db *sql.DB, from, to int) error {
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log.Printf("Migrating database from version %d to %d\n", from, to)
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for v := from; v < to; v++ {
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switch v {
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case 0:
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log.Printf("Migration step from %d to %d\n", v, v+1)
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default:
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panic("missing database migration step")
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}
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}
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_, err := db.Exec("UPDATE config SET value = ? WHERE key = ?", to, "version")
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if err != nil {
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return err
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}
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return nil
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}
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