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books/backend/database/manager.ts
2022-05-23 16:18:23 +05:30

132 lines
3.2 KiB
TypeScript

import { constants } from 'fs';
import fs from 'fs/promises';
import { DatabaseDemuxBase, DatabaseMethod } from 'utils/db/types';
import { getSchemas } from '../../schemas';
import { databaseMethodSet } from '../helpers';
import patches from '../patches';
import { BespokeQueries } from './bespoke';
import DatabaseCore from './core';
import { runPatches } from './runPatch';
import { BespokeFunction, Patch } from './types';
export class DatabaseManager extends DatabaseDemuxBase {
db?: DatabaseCore;
get #isInitialized(): boolean {
return this.db !== undefined && this.db.knex !== undefined;
}
getSchemaMap() {
return this.db?.schemaMap ?? {};
}
async createNewDatabase(dbPath: string, countryCode: string) {
await this.#unlinkIfExists(dbPath);
return await this.connectToDatabase(dbPath, countryCode);
}
async connectToDatabase(dbPath: string, countryCode?: string) {
countryCode ??= await DatabaseCore.getCountryCode(dbPath);
this.db = new DatabaseCore(dbPath);
this.db.connect();
const schemaMap = getSchemas(countryCode);
this.db.setSchemaMap(schemaMap);
await this.#migrate();
return countryCode;
}
async call(method: DatabaseMethod, ...args: unknown[]) {
if (!this.#isInitialized) {
return;
}
if (!databaseMethodSet.has(method)) {
return;
}
// @ts-ignore
const response = await this.db[method](...args);
if (method === 'close') {
delete this.db;
}
return response;
}
async callBespoke(method: string, ...args: unknown[]): Promise<unknown> {
if (!this.#isInitialized) {
return;
}
if (!BespokeQueries.hasOwnProperty(method)) {
return;
}
// @ts-ignore
const queryFunction: BespokeFunction = BespokeQueries[method];
return await queryFunction(this.db!, ...args);
}
async #migrate(): Promise<void> {
if (!this.#isInitialized) {
return;
}
const isFirstRun = await this.#getIsFirstRun();
if (isFirstRun) {
await this.db!.migrate();
}
const patchesToExecute = await this.#getPatchesToExecute();
const preMigrationPatches = patchesToExecute.filter(
(p) => p.patch.beforeMigrate
);
const postMigrationPatches = patchesToExecute.filter(
(p) => !p.patch.beforeMigrate
);
await runPatches(preMigrationPatches, this);
await this.db!.migrate();
await runPatches(postMigrationPatches, this);
}
async #getPatchesToExecute(): Promise<Patch[]> {
if (this.db === undefined) {
return [];
}
const query: { name: string }[] = await this.db.knex!('PatchRun').select(
'name'
);
const executedPatches = query.map((q) => q.name);
return patches.filter((p) => !executedPatches.includes(p.name));
}
async #unlinkIfExists(dbPath: string) {
const exists = await fs
.access(dbPath, constants.W_OK)
.then(() => true)
.catch(() => false);
if (exists) {
fs.unlink(dbPath);
}
}
async #getIsFirstRun(): Promise<boolean> {
if (!this.#isInitialized) {
return true;
}
const tableList: unknown[] = await this.db!.knex!.raw(
"SELECT name FROM sqlite_master WHERE type='table'"
);
return tableList.length === 0;
}
}
export default new DatabaseManager();