typeorm / typeorm / 19549987525

import fs from "fs/promises"

import path from "path"

import { DriverPackageNotInstalledError } from "../../error/DriverPackageNotInstalledError"

import { SqliteQueryRunner } from "./SqliteQueryRunner"

import { PlatformTools } from "../../platform/PlatformTools"

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

import { SqliteConnectionOptions } from "./SqliteConnectionOptions"

import { ColumnType } from "../types/ColumnTypes"

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

import { AbstractSqliteDriver } from "../sqlite-abstract/AbstractSqliteDriver"

import { ReplicationMode } from "../types/ReplicationMode"

import { filepathToName, isAbsolute } from "../../util/PathUtils"

/**

 * Organizes communication with sqlite DBMS.

 */

export class SqliteDriver extends AbstractSqliteDriver {

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

    // Public Properties

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

    /**

     * Connection options.

     */

    options: SqliteConnectionOptions

    /**

     * SQLite underlying library.

     */

    sqlite: any

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

    // Constructor

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

    constructor(connection: DataSource) {

        super(connection)

        this.connection = connection

        this.options = connection.options as SqliteConnectionOptions

        this.database = this.options.database

        // load sqlite package

        this.loadDependencies()

    }

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

    // Public Methods

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

    /**

     * Closes connection with database.

     */

    async disconnect(): Promise<void> {

        return new Promise<void>((ok, fail) => {

            this.queryRunner = undefined

            this.databaseConnection.close((err: any) =>

            )

        })

    }

    /**

     * Creates a query runner used to execute database queries.

     */

    createQueryRunner(mode: ReplicationMode): QueryRunner {

        if (!this.queryRunner) this.queryRunner = new SqliteQueryRunner(this)

        return this.queryRunner

    }

    normalizeType(column: {

        type?: ColumnType

        length?: number | string

        precision?: number | null

        scale?: number

    }): string {

        if ((column.type as any) === Buffer) {

            return "blob"

        }

        return super.normalizeType(column)

    }

    async afterConnect(): Promise<void> {

        return this.attachDatabases()

    }

    /**

     * For SQLite, the database may be added in the decorator metadata. It will be a filepath to a database file.

     */

    buildTableName(

        tableName: string,

        _schema?: string,

        database?: string,

    ): string {

        if (!database) return tableName

        if (this.getAttachedDatabaseHandleByRelativePath(database))

            return `${this.getAttachedDatabaseHandleByRelativePath(

                database,

            )}.${tableName}`

        if (database === this.options.database) return tableName

        // we use the decorated name as supplied when deriving attach handle (ideally without non-portable absolute path)

        const identifierHash = filepathToName(database)

        // decorated name will be assumed relative to main database file when non absolute. Paths supplied as absolute won't be portable

        const absFilepath = isAbsolute(database)

            : path.join(this.getMainDatabasePath(), database)

        this.attachedDatabases[database] = {

            attachFilepathAbsolute: absFilepath,

            attachFilepathRelative: database,

            attachHandle: identifierHash,

        }

        return `${identifierHash}.${tableName}`

    }

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

    // Protected Methods

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

    /**

     * Creates connection with the database.

     */

    protected async createDatabaseConnection() {

        if (

            this.options.flags === undefined ||

            !(this.options.flags & this.sqlite.OPEN_URI)

        ) {

            await this.createDatabaseDirectory(this.options.database)

        }

        const databaseConnection: any = await new Promise((ok, fail) => {

            if (this.options.flags === undefined) {

                const connection = new this.sqlite.Database(

                    this.options.database,

                    (err: any) => {

                        ok(connection)

                    },

                )

            } else {

                const connection = new this.sqlite.Database(

                    this.options.database,

                    this.options.flags,

                    (err: any) => {

                        ok(connection)

                    },

                )

            }

        })

        // Internal function to run a command on the connection and fail if an error occured.

        function run(line: string): Promise<void> {

            return new Promise((ok, fail) => {

                databaseConnection.run(line, (err: any) => {

                    ok()

                })

            })

        }

        // in the options, if encryption key for SQLCipher is setted.

        // Must invoke key pragma before trying to do any other interaction with the database.

        if (this.options.enableWAL) {

            await run(`PRAGMA journal_mode = WAL`)

        }

        if (

            this.options.busyTimeout &&

            typeof this.options.busyTimeout === "number" &&

            this.options.busyTimeout > 0

        ) {

            await run(`PRAGMA busy_timeout = ${this.options.busyTimeout}`)

        }

        // we need to enable foreign keys in sqlite to make sure all foreign key related features

        // working properly. this also makes onDelete to work with sqlite.

        await run(`PRAGMA foreign_keys = ON`)

        return databaseConnection

    }

    /**

     * If driver dependency is not given explicitly, then try to load it via "require".

     */

    protected loadDependencies(): void {

        try {

            const sqlite = this.options.driver || PlatformTools.load("sqlite3")

            this.sqlite = sqlite.verbose()

    }

    /**

     * Auto creates database directory if it does not exist.

     */

    protected async createDatabaseDirectory(fullPath: string): Promise<void> {

        await fs.mkdir(path.dirname(fullPath), { recursive: true })

    }

    /**

     * Performs the attaching of the database files. The attachedDatabase should have been populated during calls to #buildTableName

     * during EntityMetadata production (see EntityMetadata#buildTablePath)

     *

     * https://sqlite.org/lang_attach.html

     */

    protected async attachDatabases() {

        // @todo - possibly check number of databases (but unqueriable at runtime sadly) - https://www.sqlite.org/limits.html#max_attached

        for (const { attachHandle, attachFilepathAbsolute } of Object.values(

            this.attachedDatabases,

        )) {

            await this.createDatabaseDirectory(attachFilepathAbsolute)

            await this.connection.query(

                `ATTACH "${attachFilepathAbsolute}" AS "${attachHandle}"`,

            )

        }

    }

    protected getMainDatabasePath(): string {

        const optionsDb = this.options.database

        return path.dirname(

            isAbsolute(optionsDb)

                ? optionsDb

        )

    }

}