88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package db
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import (
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scn "blackforestbytes.com/simplecloudnotifier"
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"blackforestbytes.com/simplecloudnotifier/db/schema"
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"context"
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"database/sql"
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"errors"
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"fmt"
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_ "github.com/mattn/go-sqlite3"
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"time"
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)
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type Database struct {
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db *sql.DB
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}
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func NewDatabase(conf scn.Config) (*Database, error) {
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db, err := sql.Open("sqlite3", conf.DBFile)
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if err != nil {
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return nil, err
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}
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return &Database{db}, nil
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}
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func (db *Database) Migrate(ctx context.Context) error {
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ctx, cancel := context.WithTimeout(context.Background(), 24*time.Second)
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defer cancel()
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currschema, err := db.ReadSchema(ctx)
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if currschema == 0 {
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_, err = db.db.ExecContext(ctx, schema.Schema3)
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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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} else if currschema == 1 {
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return errors.New("cannot autom. upgrade schema 1")
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} else if currschema == 2 {
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return errors.New("cannot autom. upgrade schema 2") //TODO
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} else if currschema == 3 {
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return nil // current
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} else {
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return errors.New(fmt.Sprintf("Unknown DB schema: %d", currschema))
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}
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}
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func (db *Database) ReadSchema(ctx context.Context) (int, error) {
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r1, err := db.db.QueryContext(ctx, "SELECT name FROM sqlite_master WHERE type='table' AND name='meta'")
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if err != nil {
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return 0, err
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}
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if !r1.Next() {
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return 0, nil
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}
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r2, err := db.db.QueryContext(ctx, "SELECT value_int FROM meta WHERE meta_key='schema'")
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if err != nil {
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return 0, err
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}
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if !r2.Next() {
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return 0, errors.New("no schema entry in meta table")
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}
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var dbschema int
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err = r2.Scan(&dbschema)
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if err != nil {
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return 0, err
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}
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return dbschema, nil
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}
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func (db *Database) Ping() error {
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return db.db.Ping()
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}
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func (db *Database) BeginTx(ctx context.Context) (*sql.Tx, error) {
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return db.db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelDefault})
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}
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