a2e20c93ae
Initially we duplicated the code to avoid large scale changes to the packages. Now we are past metainfo refactor we can remove the duplication. Change-Id: I9d0b2756cc6e2a2f4d576afa408a15273a7e1cef
68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
|
|
// See LICENSE for copying information.
|
|
|
|
package migrate
|
|
|
|
import (
|
|
"context"
|
|
"database/sql"
|
|
"errors"
|
|
|
|
"github.com/zeebo/errs"
|
|
|
|
"storj.io/private/dbutil/txutil"
|
|
"storj.io/private/tagsql"
|
|
)
|
|
|
|
// Error is the default migrate errs class.
|
|
var Error = errs.Class("migrate")
|
|
|
|
// Create with a previous schema check.
|
|
func Create(ctx context.Context, identifier string, db DBX) error {
|
|
// is this necessary? it's not immediately obvious why we roll back the transaction
|
|
// when the schemas match.
|
|
justRollbackPlease := errs.Class("only used to tell WithTx to do a rollback")
|
|
|
|
err := txutil.WithTx(ctx, db, nil, func(ctx context.Context, tx tagsql.Tx) (err error) {
|
|
schema := db.Schema()
|
|
|
|
_, err = tx.ExecContext(ctx, db.Rebind(`CREATE TABLE IF NOT EXISTS table_schemas (id text, schemaText text);`))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
row := tx.QueryRow(ctx, db.Rebind(`SELECT schemaText FROM table_schemas WHERE id = ?;`), identifier)
|
|
|
|
var previousSchema string
|
|
err = row.Scan(&previousSchema)
|
|
|
|
// not created yet
|
|
if errors.Is(err, sql.ErrNoRows) {
|
|
_, err := tx.ExecContext(ctx, schema)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = tx.ExecContext(ctx, db.Rebind(`INSERT INTO table_schemas(id, schemaText) VALUES (?, ?);`), identifier, schema)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if schema != previousSchema {
|
|
return Error.New("schema mismatch:\nold %v\nnew %v", previousSchema, schema)
|
|
}
|
|
|
|
return justRollbackPlease.New("")
|
|
})
|
|
if justRollbackPlease.Has(err) {
|
|
err = nil
|
|
}
|
|
return Error.Wrap(err)
|
|
}
|