typeorm / typeorm / 19549987525

import { Table } from "../schema-builder/table/Table"

import { DataSource } from "../data-source/DataSource"

import { Migration } from "./Migration"

import { ObjectLiteral } from "../common/ObjectLiteral"

import { QueryRunner } from "../query-runner/QueryRunner"

import { MssqlParameter } from "../driver/sqlserver/MssqlParameter"

import { MongoQueryRunner } from "../driver/mongodb/MongoQueryRunner"

import { ForbiddenTransactionModeOverrideError, TypeORMError } from "../error"

import { InstanceChecker } from "../util/InstanceChecker"

/**

 * Executes migrations: runs pending and reverts previously executed migrations.

 */

export class MigrationExecutor {

    // -------------------------------------------------------------------------

    // Public Properties

    // -------------------------------------------------------------------------

    /**

     * Indicates how migrations should be run in transactions.

     *   all: all migrations are run in a single transaction

     *   none: all migrations are run without a transaction

     *   each: each migration is run in a separate transaction

     */

    transaction: "all" | "none" | "each" = "all"

    /**

     * Option to fake-run or fake-revert a migration, adding to the

     * executed migrations table, but not actually running it. This feature is

     * useful for when migrations are added after the fact or for

     * interoperability between applications which are desired to each keep

     * a consistent migration history.

     */

    fake: boolean

    // -------------------------------------------------------------------------

    // Private Properties

    // -------------------------------------------------------------------------

    private readonly migrationsDatabase?: string

    private readonly migrationsSchema?: string

    private readonly migrationsTable: string

    private readonly migrationsTableName: string

    // -------------------------------------------------------------------------

    // Constructor

    // -------------------------------------------------------------------------

    constructor(

        protected connection: DataSource,

        protected queryRunner?: QueryRunner,

    ) {

        const { schema } = this.connection.driver.options as any

        const database = this.connection.driver.database

        this.migrationsDatabase = database

        this.migrationsSchema = schema

        this.migrationsTableName =

            connection.options.migrationsTableName || "migrations"

        this.migrationsTable = this.connection.driver.buildTableName(

            this.migrationsTableName,

            schema,

            database,

        )

    }

    // -------------------------------------------------------------------------

    // Public Methods

    // -------------------------------------------------------------------------

    /**

     * Tries to execute a single migration given.

     */

    public async executeMigration(migration: Migration): Promise<Migration> {

    /**

     * Returns an array of all migrations.

     */

    public async getAllMigrations(): Promise<Migration[]> {

    /**

     * Returns an array of all executed migrations.

     */

    public async getExecutedMigrations(): Promise<Migration[]> {

    /**

     * Returns an array of all pending migrations.

     */

    public async getPendingMigrations(): Promise<Migration[]> {

    /**

     * Inserts an executed migration.

     */

    public insertMigration(migration: Migration): Promise<void> {

    /**

     * Deletes an executed migration.

     */

    public deleteMigration(migration: Migration): Promise<void> {

    /**

     * Lists all migrations and whether they have been executed or not

     * returns true if there are unapplied migrations

     */

    async showMigrations(): Promise<boolean> {

        let hasUnappliedMigrations = false

        const queryRunner =

            this.queryRunner || this.connection.createQueryRunner()

        // create migrations table if its not created yet

        await this.createMigrationsTableIfNotExist(queryRunner)

        // get all migrations that are executed and saved in the database

        const executedMigrations = await this.loadExecutedMigrations(

            queryRunner,

        )

        // get all user's migrations in the source code

        const allMigrations = this.getMigrations()

        for (const migration of allMigrations) {

            const executedMigration = executedMigrations.find(

                (executedMigration) =>

                    executedMigration.name === migration.name,

            )

            if (executedMigration) {

                this.connection.logger.logSchemaBuild(

                    `[X] ${executedMigration.id} ${migration.name}`,

                )

            } else {

                hasUnappliedMigrations = true

                this.connection.logger.logSchemaBuild(`[ ] ${migration.name}`)

            }

        }

        // if query runner was created by us then release it

        if (!this.queryRunner) {

            await queryRunner.release()

        }

        return hasUnappliedMigrations

    }

    /**

     * Executes all pending migrations. Pending migrations are migrations that are not yet executed,

     * thus not saved in the database.

     */

    async executePendingMigrations(): Promise<Migration[]> {

        const queryRunner =

            this.queryRunner || this.connection.createQueryRunner()

        // create migrations table if it's not created yet

        await this.createMigrationsTableIfNotExist(queryRunner)

        // create the typeorm_metadata table if it's not created yet

        const schemaBuilder = this.connection.driver.createSchemaBuilder()

            await schemaBuilder.createMetadataTableIfNecessary(queryRunner)

        }

        // get all migrations that are executed and saved in the database

        const executedMigrations = await this.loadExecutedMigrations(

            queryRunner,

        )

        // get the time when last migration was executed

        const lastTimeExecutedMigration =

            this.getLatestTimestampMigration(executedMigrations)

        // get all user's migrations in the source code

        const allMigrations = this.getMigrations()

        // variable to store all migrations we did successfully

        const successMigrations: Migration[] = []

        // find all migrations that needs to be executed

        const pendingMigrations = allMigrations.filter((migration) => {

            // check if we already have executed migration

            const executedMigration = executedMigrations.find(

                (executedMigration) =>

                    executedMigration.name === migration.name,

            )

            if (executedMigration) return false

            // migration is new and not executed. now check if its timestamp is correct

            // if (lastTimeExecutedMigration && migration.timestamp < lastTimeExecutedMigration.timestamp)

            //     throw new TypeORMError(`New migration found: ${migration.name}, however this migration's timestamp is not valid. Migration's timestamp should not be older then migrations already executed in the database.`);

            // every check is passed means that migration was not run yet and we need to run it

            return true

        })

        // if no migrations are pending then nothing to do here

            this.connection.logger.logSchemaBuild(`No migrations are pending`)

            // if query runner was created by us then release it

            if (!this.queryRunner) await queryRunner.release()

            return []

        }

        // log information about migration execution

        this.connection.logger.logSchemaBuild(

            `${executedMigrations.length} migrations are already loaded in the database.`,

        )

        this.connection.logger.logSchemaBuild(

            `${allMigrations.length} migrations were found in the source code.`,

        )

        if (lastTimeExecutedMigration)

                `${

                    lastTimeExecutedMigration.name

                } is the last executed migration. It was executed on ${new Date(

                    lastTimeExecutedMigration.timestamp,

                ).toString()}.`,

            )

        this.connection.logger.logSchemaBuild(

            `${pendingMigrations.length} migrations are new migrations must be executed.`,

        )

        if (this.transaction === "all") {

            // If we desire to run all migrations in a single transaction

            // but there is a migration that explicitly overrides the transaction mode

            // then we have to fail since we cannot properly resolve that intent

            // In theory we could support overrides that are set to `true`,

            // however to keep the interface more rigid, we fail those too

            const migrationsOverridingTransactionMode =

                pendingMigrations.filter(

                    (migration) =>

                        !(migration.instance?.transaction === undefined),

                )

                const error = new ForbiddenTransactionModeOverrideError(

                    migrationsOverridingTransactionMode,

                )

                this.connection.logger.logMigration(

                    `Migrations failed, error: ${error.message}`,

                )

                throw error

            }

        }

        // Set the per-migration defaults for the transaction mode

        // so that we have one centralized place that controls this behavior

        // When transaction mode is `each` the default is to run in a transaction

        // When transaction mode is `none` the default is to not run in a transaction

        // When transaction mode is `all` the default is to not run in a transaction

        // since all the migrations are already running in one single transaction

        const txModeDefault = {

            each: true,

            none: false,

            all: false,

        }[this.transaction]

        for (const migration of pendingMigrations) {

            if (migration.instance) {

                const instanceTx = migration.instance.transaction

                if (instanceTx === undefined) {

                    migration.transaction = txModeDefault

                    migration.transaction = instanceTx

                }

            }

        }

        // start transaction if its not started yet

        let transactionStartedByUs = false

        if (this.transaction === "all" && !queryRunner.isTransactionActive) {

            await queryRunner.beforeMigration()

            await queryRunner.startTransaction()

            transactionStartedByUs = true

        }

        // run all pending migrations in a sequence

        try {

            for (const migration of pendingMigrations) {

                    // directly insert migration record into the database if it is fake

                    await this.insertExecutedMigration(queryRunner, migration)

                    // nothing else needs to be done, continue to next migration

                    continue

                }

                    await queryRunner.beforeMigration()

                    await queryRunner.startTransaction()

                    transactionStartedByUs = true

                }

                await migration

                    .instance!.up(queryRunner)

                    .catch((error) => {

                        // informative log about migration failure

                        this.connection.logger.logMigration(

                            `Migration "${migration.name}" failed, error: ${error?.message}`,

                        )

                        throw error

                    })

                    .then(async () => {

                        // now when migration is executed we need to insert record about it into the database

                        await this.insertExecutedMigration(

                            queryRunner,

                            migration,

                        )

                        // commit transaction if we started it

                            await queryRunner.commitTransaction()

                            await queryRunner.afterMigration()

                        }

                    })

                    .then(() => {

                        // informative log about migration success

                        successMigrations.push(migration)

                        this.connection.logger.logSchemaBuild(

                            `Migration ${migration.name} has been ${

                            }executed successfully.`,

                        )

                    })

            }

            // commit transaction if we started it

            if (this.transaction === "all" && transactionStartedByUs) {

                await queryRunner.commitTransaction()

                await queryRunner.afterMigration()

            }

            // rollback transaction if we started it

            if (transactionStartedByUs) {

                try {

                    // we throw original error even if rollback thrown an error

                    await queryRunner.rollbackTransaction()

            }

            throw err

        } finally {

            // if query runner was created by us then release it

            if (!this.queryRunner) await queryRunner.release()

        }

        return successMigrations

    }

    /**

     * Reverts last migration that were run.

     */

    async undoLastMigration(): Promise<void> {

        const queryRunner =

            this.queryRunner || this.connection.createQueryRunner()

        // create migrations table if it's not created yet

        await this.createMigrationsTableIfNotExist(queryRunner)

        // create typeorm_metadata table if it's not created yet

        const schemaBuilder = this.connection.driver.createSchemaBuilder()

            await schemaBuilder.createMetadataTableIfNecessary(queryRunner)

        }

        // get all migrations that are executed and saved in the database

        const executedMigrations = await this.loadExecutedMigrations(

            queryRunner,

        )

        // get the time when last migration was executed

        const lastTimeExecutedMigration =

            this.getLatestExecutedMigration(executedMigrations)

        // if no migrations found in the database then nothing to revert

        // get all user's migrations in the source code

        const allMigrations = this.getMigrations()

        // find the instance of the migration we need to remove

        const migrationToRevert = allMigrations.find(

            (migration) => migration.name === lastTimeExecutedMigration!.name,

        )

        // if no migrations found in the database then nothing to revert

        if (!migrationToRevert)

        // log information about migration execution

        this.connection.logger.logSchemaBuild(

            `${executedMigrations.length} migrations are already loaded in the database.`,

        )

        this.connection.logger.logSchemaBuild(

            `${

                lastTimeExecutedMigration.name

            } is the last executed migration. It was executed on ${new Date(

                lastTimeExecutedMigration.timestamp,

            ).toString()}.`,

        )

        this.connection.logger.logSchemaBuild(`Now reverting it...`)

        // start transaction if its not started yet

        let transactionStartedByUs = false

        if (this.transaction !== "none" && !queryRunner.isTransactionActive) {

            await queryRunner.startTransaction()

            transactionStartedByUs = true

        }

        try {

            if (!this.fake) {

                await queryRunner.beforeMigration()

                await migrationToRevert.instance!.down(queryRunner)

            }

            await this.deleteExecutedMigration(queryRunner, migrationToRevert)

            this.connection.logger.logSchemaBuild(

                `Migration ${migrationToRevert.name} has been ${

                }reverted successfully.`,

            )

            // commit transaction if we started it

            if (transactionStartedByUs) await queryRunner.commitTransaction()

            // rollback transaction if we started it

            if (transactionStartedByUs) {

                try {

                    // we throw original error even if rollback thrown an error

                    await queryRunner.rollbackTransaction()

            }

            throw err

        } finally {

            // if query runner was created by us then release it

            if (!this.queryRunner) await queryRunner.release()

        }

    }

    // -------------------------------------------------------------------------

    // Protected Methods

    // -------------------------------------------------------------------------

    /**

     * Creates table "migrations" that will store information about executed migrations.

     */

    protected async createMigrationsTableIfNotExist(

        queryRunner: QueryRunner,

    ): Promise<void> {

        // If driver is mongo no need to create

            return

        }

        if (!tableExist) {

            await queryRunner.createTable(

                new Table({

                    database: this.migrationsDatabase,

                    schema: this.migrationsSchema,

                    name: this.migrationsTable,

                    columns: [

                        {

                            name: "id",

                            type: this.connection.driver.normalizeType({

                                type: this.connection.driver.mappedDataTypes

                                    .migrationId,

                            }),

                            isGenerated: true,

                            generationStrategy: "increment",

                            isPrimary: true,

                            isNullable: false,

                        },

                        {

                            name: "timestamp",

                            type: this.connection.driver.normalizeType({

                                type: this.connection.driver.mappedDataTypes

                                    .migrationTimestamp,

                            }),

                            isPrimary: false,

                            isNullable: false,

                        },

                        {

                            name: "name",

                            type: this.connection.driver.normalizeType({

                                type: this.connection.driver.mappedDataTypes

                                    .migrationName,

                            }),

                            isNullable: false,

                        },

                    ],

                }),

            )

        }

    }

    /**

     * Loads all migrations that were executed and saved into the database (sorts by id).

     */

    protected async loadExecutedMigrations(

        queryRunner: QueryRunner,

    ): Promise<Migration[]> {

            const mongoRunner = queryRunner as MongoQueryRunner

            return mongoRunner

                .cursor(this.migrationsTableName, {})

                .sort({ _id: -1 })

                .toArray()

            const migrationsRaw: ObjectLiteral[] = await this.connection.manager

                .createQueryBuilder(queryRunner)

                .select()

                .orderBy(this.connection.driver.escape("id"), "DESC")

                .from(this.migrationsTable, this.migrationsTableName)

                .getRawMany()

            return migrationsRaw.map((migrationRaw) => {

                return new Migration(

                    parseInt(migrationRaw["id"]),

                    parseInt(migrationRaw["timestamp"]),

                    migrationRaw["name"],

                )

            })

        }

    }

    /**

     * Gets all migrations that setup for this connection.

     */

    protected getMigrations(): Migration[] {

        const migrations = this.connection.migrations.map((migration) => {

            const migrationClassName =

                migration.name || (migration.constructor as any).name

            const migrationTimestamp = parseInt(

                migrationClassName.substr(-13),

                10,

            )

            return new Migration(

                undefined,

                migrationTimestamp,

                migrationClassName,

                migration,

            )

        })

        this.checkForDuplicateMigrations(migrations)

        // sort them by timestamp

        return migrations.sort((a, b) => a.timestamp - b.timestamp)

    }

    protected checkForDuplicateMigrations(migrations: Migration[]) {

        const migrationNames = migrations.map((migration) => migration.name)

        const duplicates = Array.from(

            new Set(

                migrationNames.filter(

                    (migrationName, index) =>

                        migrationNames.indexOf(migrationName) < index,

                ),

            ),

        )

            throw Error(`Duplicate migrations: ${duplicates.join(", ")}`)

        }

    }

    /**

     * Finds the latest migration (sorts by timestamp) in the given array of migrations.

     */

    protected getLatestTimestampMigration(

        migrations: Migration[],

    ): Migration | undefined {

        const sortedMigrations = migrations

            .map((migration) => migration)

            .sort((a, b) => (a.timestamp - b.timestamp) * -1)

        return sortedMigrations.length > 0 ? sortedMigrations[0] : undefined

    }

    /**

     * Finds the latest migration in the given array of migrations.

     * PRE: Migration array must be sorted by descending id.

     */

    protected getLatestExecutedMigration(

        sortedMigrations: Migration[],

    ): Migration | undefined {

    }

    /**

     * Inserts new executed migration's data into migrations table.

     */

    protected async insertExecutedMigration(

        queryRunner: QueryRunner,

        migration: Migration,

    ): Promise<void> {

        const values: ObjectLiteral = {}

            values["timestamp"] = new MssqlParameter(

                migration.timestamp,

                this.connection.driver.normalizeType({

                    type: this.connection.driver.mappedDataTypes

                        .migrationTimestamp,

                }) as any,

            )

            values["name"] = new MssqlParameter(

                migration.name,

                this.connection.driver.normalizeType({

                    type: this.connection.driver.mappedDataTypes.migrationName,

                }) as any,

            )

            values["timestamp"] = migration.timestamp

            values["name"] = migration.name

        }

            const mongoRunner = queryRunner as MongoQueryRunner

            await mongoRunner.databaseConnection

                .db(this.connection.driver.database!)

                .collection(this.migrationsTableName)

                .insertOne(values)

            const qb = queryRunner.manager.createQueryBuilder()

            await qb

                .insert()

                .into(this.migrationsTable)

                .values(values)

                .execute()

        }

    }

    /**

     * Delete previously executed migration's data from the migrations table.

     */

    protected async deleteExecutedMigration(

        queryRunner: QueryRunner,

        migration: Migration,

    ): Promise<void> {

        const conditions: ObjectLiteral = {}

            conditions["timestamp"] = new MssqlParameter(

                migration.timestamp,

                this.connection.driver.normalizeType({

                    type: this.connection.driver.mappedDataTypes

                        .migrationTimestamp,

                }) as any,

            )

            conditions["name"] = new MssqlParameter(

                migration.name,

                this.connection.driver.normalizeType({

                    type: this.connection.driver.mappedDataTypes.migrationName,

                }) as any,

            )

            conditions["timestamp"] = migration.timestamp

            conditions["name"] = migration.name

        }

            const mongoRunner = queryRunner as MongoQueryRunner

            await mongoRunner.databaseConnection

                .db(this.connection.driver.database!)

                .collection(this.migrationsTableName)

                .deleteOne(conditions)

            const qb = queryRunner.manager.createQueryBuilder()

            await qb

                .delete()

                .from(this.migrationsTable)

                .where(`${qb.escape("timestamp")} = :timestamp`)

                .andWhere(`${qb.escape("name")} = :name`)

                .setParameters(conditions)

                .execute()

        }

    }

    protected async withQueryRunner<T extends any>(

}