smartclickhouse/ts/smartclickhouse.classes.timedatatable.ts

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import * as plugins from './smartclickhouse.plugins';
import { SmartClickHouseDb } from './smartclickhouse.classes.smartclickhouse';
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export type TClickhouseColumnDataType = 'String' | "DateTime64(3, 'Europe/Berlin')" | 'Float64';
export interface IColumnInfo {
database: string;
table: string;
name: string;
type: TClickhouseColumnDataType;
position: string;
default_kind: string;
default_expression: string;
data_compressed_bytes: string;
data_uncompressed_bytes: string;
marks_bytes: string;
comment: string;
is_in_partition_key: 0 | 1;
is_in_sorting_key: 0 | 1;
is_in_primary_key: 0 | 1;
is_in_sampling_key: 0 | 1;
compression_codec: string;
character_octet_length: null;
numeric_precision: null;
numeric_precision_radix: null;
numeric_scale: null;
datetime_precision: '3';
}
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export class TimeDataTable {
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public static async getTable(smartClickHouseDbRefArg: SmartClickHouseDb, tableNameArg: string) {
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const newTable = new TimeDataTable(smartClickHouseDbRefArg, tableNameArg);
// create table in clickhouse
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await smartClickHouseDbRefArg.clickhouseClient
.queryPromise(`CREATE TABLE IF NOT EXISTS ${newTable.tableName} (
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timestamp DateTime64(3, 'Europe/Berlin'),
message String
) ENGINE=MergeTree() ORDER BY timestamp`);
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await newTable.updateColumns();
console.log(`=======================`)
console.log(
`table with name "${newTable.tableName}" in databse ${newTable.smartClickHouseDbRef.options.database} has the following columns:`
);
for (const column of newTable.columns) {
console.log(`>> ${column.name}: ${column.type}`);
}
console.log('^^^^^^^^^^^^^^\n');
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return newTable;
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}
// INSTANCE
public smartClickHouseDbRef: SmartClickHouseDb;
public tableName: string;
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constructor(smartClickHouseDbRefArg: SmartClickHouseDb, tableNameArg: string) {
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this.smartClickHouseDbRef = smartClickHouseDbRefArg;
this.tableName = tableNameArg;
}
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public columns: IColumnInfo[] = [];
public seenPaths: { pathName: string; type: TClickhouseColumnDataType }[] = [];
/**
* updates the columns
*/
public async updateColumns() {
this.columns = await this.smartClickHouseDbRef.clickhouseClient.queryPromise(`
SELECT * FROM system.columns
WHERE database LIKE '${this.smartClickHouseDbRef.options.database}'
AND table LIKE '${this.tableName}'
`);
return this.columns;
}
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/**
* stores a json and tries to map it to the nested syntax
*/
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public async addData(dataArg: any) {
// the storageJson
let storageJson: { [key: string]: any } = {};
// helper stuff
const typeConversion: {[key: string]: TClickhouseColumnDataType} = {
string: 'String',
number: 'Float64',
};
const getClickhouseTypeForValue = (valueArg: any) => {
return typeConversion[(typeof valueArg) as string];
}
const checkPath = async (pathArg: string, typeArg: TClickhouseColumnDataType) => {
let columnFound = false;
for (const column of this.columns) {
if (pathArg === column.name) {
columnFound = true;
break;
}
}
if (!columnFound) {
await this.smartClickHouseDbRef.clickhouseClient.queryPromise(`
ALTER TABLE ${this.tableName} ADD COLUMN ${pathArg} ${typeArg} FIRST
`);
await this.updateColumns();
}
};
// key checking
const flatDataArg = plugins.smartobject.toFlatObject(dataArg);
for (const key of Object.keys(flatDataArg)) {
const value = flatDataArg[key];
if (key === 'timestamp' && typeof value !== 'number') {
throw new Error('timestamp must be of type number');
} else if (key === 'timestamp') {
storageJson.timestamp = flatDataArg[key];
continue;
}
// lets deal with the rest
const clickhouseType = getClickhouseTypeForValue(value);
await checkPath(key, clickhouseType);
storageJson[key] = value;
}
const result = await this.smartClickHouseDbRef.clickhouseClient.insertPromise(this.tableName, [
storageJson,
]);
return result;
}
}