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171 lines
4.6 KiB
171 lines
4.6 KiB
import { Target } from '../types/target'; |
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import { URL } from 'url'; |
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import { apiKeys } from '../config'; |
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import { promisify } from '../utils'; |
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import { ExportStatus } from '../types/export-status'; |
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import { DataSourceRef } from '../types'; |
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import { QueryConfig, queryByConfig } from '@corpglory/tsdb-kit'; |
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// TODO: export QueryType directly from @corpglory/tsdb-kit |
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import { QueryType } from '@corpglory/tsdb-kit/lib/connectors'; |
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import * as moment from 'moment'; |
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import * as csv from 'fast-csv'; |
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import * as fs from 'fs'; |
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import * as path from 'path'; |
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import * as _ from 'lodash'; |
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const MS_IN_DAY = 24 * 60 * 60 * 1000; |
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export class Exporter { |
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private exportedRows = 0; |
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private createdTimestamp: number; |
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private username: string; |
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private datasourceRef: DataSourceRef; |
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private initCsvStream() { |
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const csvStream = csv.createWriteStream({ headers: true }) |
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.on('error', error => console.error(error)); |
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const writableStream = fs.createWriteStream(this.getFilePath('csv')); |
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csvStream.pipe(writableStream); |
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writableStream.on('finish', async () => { |
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console.log(`Everything is written to ${this.getFilename('csv')}`); |
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await this.updateStatus(ExportStatus.FINISHED, 1); |
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}) |
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return csvStream; |
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} |
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public async updateStatus(status: string, progress: number) { |
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try { |
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let time = moment().valueOf(); |
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let data = { |
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time, |
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username: this.username, |
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exportedRows: this.exportedRows, |
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progress: progress, |
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status, |
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datasourceRef: this.datasourceRef, |
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}; |
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await promisify(fs.writeFile, this.getFilePath('json'), JSON.stringify(data), 'utf8') |
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} catch(err) { |
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console.error(err); |
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throw new Error('Can`t write file'); |
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} |
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} |
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// TODO: rename `data` to `targets` or `queries` |
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public async export(data: Target[], datasourceUrl: string, username: string, from: number, to: number) { |
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this.username = username; |
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this.validateTargets(datasourceUrl, data); |
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const targets = data.map(target => { |
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console.log('target', { |
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...target.datasource, |
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url: datasourceUrl |
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}); |
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return { |
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...target, |
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metric: new QueryConfig( |
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QueryType.GRAFANA, |
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{ |
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...target.datasource, |
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url: datasourceUrl |
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}, |
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target.panel.targets |
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) |
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} |
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}); |
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const datasource = data[0].datasource; |
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this.datasourceRef = { uid: datasource.uid, type: datasource.type }; |
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await this.updateStatus(ExportStatus.EXPORTING, 0); |
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const stream = this.initCsvStream(); |
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const days = Math.ceil((to - from) / MS_IN_DAY); |
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console.log(`Total days: ${days}`); |
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for(let day = 0; day < days; day++) { |
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to = from + MS_IN_DAY; |
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console.log(`${day} day: ${from}ms -> ${to}ms`); |
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let columns = []; |
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let values = []; |
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for(const [index, target] of targets.entries()) { |
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const host = new URL(datasourceUrl).origin; |
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const apiKey = apiKeys[host]; |
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const datasourceMetrics = await queryByConfig(target.metric, datasourceUrl, from, to, apiKey); |
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columns = datasourceMetrics.columns; |
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values = datasourceMetrics.values; |
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} |
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if(columns.length > 0) { |
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console.log('values', values); |
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this.writeCsv(stream, { |
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columns, |
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values, |
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}); |
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} |
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await this.updateStatus(ExportStatus.EXPORTING, (day + 1) / days); |
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from += MS_IN_DAY; |
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} |
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stream.end(); |
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} |
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private validateTargets(datasourceUrl: string, targets: Target[]) { |
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if(!targets || !Array.isArray(targets)) { |
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throw new Error('Incorrect targets format'); |
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} |
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if(targets.length > 1) { |
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throw new Error(`Multiple queries are not supported yet`); |
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} |
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const host = new URL(datasourceUrl).origin; |
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const apiKey = apiKeys[host]; |
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if(apiKey === undefined || apiKey === '') { |
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throw new Error(`Please configure API key for ${host}`); |
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} |
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} |
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private writeCsv(stream, series) { |
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for(let row of series.values) { |
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const isEmpty = _.every( |
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_.slice(row, 1), |
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val => val === null |
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); |
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if(!isEmpty) { |
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let csvRow = {}; |
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for(let col in series.columns) { |
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csvRow[series.columns[col]] = row[col]; |
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} |
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stream.write(csvRow); |
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this.exportedRows++; |
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} |
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} |
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} |
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private getFilename(extension) { |
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if(this.createdTimestamp === undefined) { |
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this.createdTimestamp = moment().valueOf(); |
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} |
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return `${this.createdTimestamp}.${this.datasourceRef.uid}.${extension}`; |
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} |
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private getFilePath(extension) { |
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let filename = this.getFilename(extension); |
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return path.join(__dirname, `../exported/${filename}`); |
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} |
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}
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