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package database
import (
"context"
"database/sql"
"embed"
"io/fs"
_ "github.com/mattn/go-sqlite3"
)
//go:embed sql/*.sql
var schemaFiles embed.FS
func DBInit(ctx context.Context, url string) (myDB *DB, err error) {
var db *sql.DB
if db, err = sql.Open("sqlite3", url); err != nil {
return nil, err
}
defer func() {
if err != nil {
_ = db.Close()
}
}()
if _, err = db.ExecContext(ctx, "PRAGMA foreign_keys = ON"); err != nil {
return nil, err
}
if _, err = db.ExecContext(ctx, "PRAGMA journal_mode = WAL"); err != nil {
return nil, err
}
var version int
if err = db.QueryRowContext(ctx, `SELECT version FROM schema_version;`).Scan(&version); err != nil {
if err.Error() == "no such table: schema_version" {
version = 0
} else {
return nil, err
}
}
statements := make([]string, 0)
err = fs.WalkDir(schemaFiles, ".", func(path string, d fs.DirEntry, err error) error {
if d.IsDir() || err != nil {
return err
}
var stmts []byte
if stmts, err = schemaFiles.ReadFile(path); err != nil {
return err
} else {
statements = append(statements, string(stmts))
}
return nil
})
if err != nil {
return nil, err
}
tx, err := db.Begin()
if err != nil {
return nil, err
}
for version < len(statements) {
if _, err = tx.ExecContext(ctx, statements[version]); err != nil {
tx.Rollback()
return nil, err
}
version++
}
if _, err = tx.ExecContext(ctx, `DELETE FROM schema_version; INSERT INTO schema_version (version) VALUES (?);`, version); err != nil {
tx.Rollback()
return nil, err
}
tx.Commit()
return &DB{ctx: ctx, db: db}, nil
}
func (db *DB) Close() error {
return db.db.Close()
}
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