68 lines
2.1 KiB
TypeScript
68 lines
2.1 KiB
TypeScript
import * as plugins from './smartclickhouse.plugins.js';
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import { TimeDataTable } from './smartclickhouse.classes.timedatatable.js';
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import { ClickhouseHttpClient } from './smartclickhouse.classes.httpclient.js';
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export interface IClickhouseConstructorOptions {
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url: string;
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database: string;
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username?: string;
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password?: string;
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/**
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* allow services to exit when waiting for clickhouse startup
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* this allows to leave the lifecycle flow to other processes
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* like a listening server.
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*/
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unref?: boolean;
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}
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export class SmartClickHouseDb {
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public options: IClickhouseConstructorOptions;
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public clickhouseHttpClient: ClickhouseHttpClient;
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constructor(optionsArg: IClickhouseConstructorOptions) {
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this.options = optionsArg;
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}
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/**
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* starts the connection to the Clickhouse db
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*/
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public async start(dropOld = false) {
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console.log(`Connecting to default database first.`);
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// lets connect
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this.clickhouseHttpClient = await ClickhouseHttpClient.createAndStart(this.options);
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await this.pingDatabaseUntilAvailable();
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console.log(`Create database ${this.options.database}, if it does not exist...`);
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await this.createDatabase(dropOld);
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}
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public async createDatabase(dropOld: boolean = false) {
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if (dropOld) {
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await this.clickhouseHttpClient.queryPromise(`DROP DATABASE IF EXISTS ${this.options.database}`);
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}
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await this.clickhouseHttpClient.queryPromise(
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`CREATE DATABASE IF NOT EXISTS ${this.options.database}`
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);
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}
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public async pingDatabaseUntilAvailable() {
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let available = false;
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while (!available) {
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available = await this.clickhouseHttpClient.ping().catch((err) => {
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return false;
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});
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if (!available) {
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console.log(`NOT OK: tried pinging ${this.options.url}... Trying again in 5 seconds.`);
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await plugins.smartdelay.delayFor(5000, null, this.options.unref);
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}
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}
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}
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/**
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* gets a table
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*/
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public async getTable(tableName: string) {
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const newTable = TimeDataTable.getTable(this, tableName);
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return newTable;
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}
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}
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