common.go

package migrations

import (
	"fmt"

	. "github.com/grafana/grafana/pkg/services/sqlstore/migrator"
)

func addDropAllIndicesMigrations(mg *Migrator, versionSuffix string, table Table) {
	for _, index := range table.Indices {
		migrationId := fmt.Sprintf("drop index %s - %s", index.XName(table.Name), versionSuffix)
		mg.AddMigration(migrationId, NewDropIndexMigration(table, index))
	}
}

func addTableIndicesMigrations(mg *Migrator, versionSuffix string, table Table) {
	for _, index := range table.Indices {
		migrationId := fmt.Sprintf("create index %s - %s", index.XName(table.Name), versionSuffix)
		mg.AddMigration(migrationId, NewAddIndexMigration(table, index))
	}
}

func addTableRenameMigration(mg *Migrator, oldName string, newName string, versionSuffix string) {
	migrationId := fmt.Sprintf("Rename table %s to %s - %s", oldName, newName, versionSuffix)
	mg.AddMigration(migrationId, NewRenameTableMigration(oldName, newName))
}

func addTableReplaceMigrations(mg *Migrator, from Table, to Table, migrationVersion int64, tableDataMigration map[string]string) {
	fromV := version(migrationVersion - 1)
	toV := version(migrationVersion)
	tmpTableName := to.Name + "_tmp_qwerty"

	createTable := fmt.Sprintf("create %v %v", to.Name, toV)
	copyTableData := fmt.Sprintf("copy %v %v to %v", to.Name, fromV, toV)
	dropTable := fmt.Sprintf("drop %v", tmpTableName)

	addDropAllIndicesMigrations(mg, fromV, from)
	addTableRenameMigration(mg, from.Name, tmpTableName, fromV)
	mg.AddMigration(createTable, NewAddTableMigration(to))
	addTableIndicesMigrations(mg, toV, to)
	mg.AddMigration(copyTableData, NewCopyTableDataMigration(to.Name, tmpTableName, tableDataMigration))
	mg.AddMigration(dropTable, NewDropTableMigration(tmpTableName))
}

func version(v int64) string {
	return fmt.Sprintf("v%v", v)
}