smartclickhouse/ts/smartclickhouse.classes.smartclickhouse.ts

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import * as plugins from './smartclickhouse.plugins.js';
import { TimeDataTable } from './smartclickhouse.classes.timedatatable.js';
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export interface IClickhouseConstructorOptions {
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url: string;
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database: string;
password?: string;
}
export class SmartClickHouseDb {
public options: IClickhouseConstructorOptions;
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public defaultClient: plugins.clickhouse.ClickHouseClient;
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public clickhouseClient: plugins.clickhouse.ClickHouseClient;
constructor(optionsArg: IClickhouseConstructorOptions) {
this.options = optionsArg;
}
/**
* starts the connection to the Clickhouse db
*/
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public async start(dropOld = false) {
console.log(`Connecting to default database first.`);
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const defaultOptions: {[keyArg: string]: string} = {};
// the protocol, url and host
const parsedUrl = plugins.smarturl.Smarturl.createFromUrl(this.options.url);
parsedUrl.protocol === 'https' ? defaultOptions.protocol = plugins.clickhouse.ClickHouseConnectionProtocol.HTTPS : null;
parsedUrl.protocol === 'http' ? defaultOptions.protocol = plugins.clickhouse.ClickHouseConnectionProtocol.HTTP : null;
defaultOptions.host = parsedUrl.hostname;
defaultOptions.port = parsedUrl.port;
// the database
defaultOptions.database = this.options.database;
// the password
this.options.password ? defaultOptions.password = this.options.password : null;
// lets connect
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this.defaultClient = new plugins.clickhouse.ClickHouseClient({
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...defaultOptions,
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database: 'default',
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});
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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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console.log(`Ensured database. Now connecting to wanted database: ${this.options.database}`);
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this.clickhouseClient = new plugins.clickhouse.ClickHouseClient({
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...defaultOptions
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});
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}
public async createDatabase(dropOld: boolean = false) {
if (dropOld) {
await this.defaultClient.queryPromise(`DROP DATABASE IF EXISTS ${this.options.database}`);
}
await this.defaultClient.queryPromise(`CREATE DATABASE IF NOT EXISTS ${this.options.database}`);
}
public async pingDatabaseUntilAvailable() {
let available = false;
while(!available) {
available = await this.defaultClient.ping().catch(err => {
return false;
});
if (!available) {
console.log(`NOT OK: tried pinging ${this.options.url}... Trying again in 5 seconds.`);
await plugins.smartdelay.delayFor(5000);
}
}
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}
/**
* gets a table
*/
public async getTable(tableName: string) {
const newTable = TimeDataTable.getTable(this, tableName);
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return newTable;
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}
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}