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import { DatasourceConnector, Datasource, DatasourceQuery, DataTable } from '.';
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const QUERY_TIME_REGEX = /\&start=[^\&]*\&end=[^\&]*\&/;
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export class PrometheusConnector extends DatasourceConnector {
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constructor(datasource: Datasource, targets: any[]) {
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super(datasource, targets);
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}
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getQuery(from: number, to: number, limit: number, offset: number): DatasourceQuery {
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let url = this.datasource.url;
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from = Math.floor(from / 1000); //prometheus uses seconds for timestamp
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to = Math.floor(to / 1000);
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url = url.replace(/\&start=[^\&]+/, `&start=${from}`);
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url = url.replace(/\&end=[^\&]+/, `&end=${to}`);
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return {
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url,
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method: 'GET',
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schema: {
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params: this.datasource.params
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},
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auth: this.datasource.auth,
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}
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}
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parseResponse(res): DataTable {
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if(res.data === undefined || res.data.data.result.length < 1) {
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console.log('datasource return empty response, no data');
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return {
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columns: ['timestamp', 'target'],
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values: []
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};
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}
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let result = res.data.data.result;
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let result_matrix: DataTable = {
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columns: ['timestamp'],
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values: []
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};
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result.map(r => {
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let keys: string[] = [];
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for(let key in r.metric) {
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keys.push(`${key}=${r.metric[key]}`);
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}
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result_matrix.columns.push(keys.join(':'));
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});
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let values = result.map(r => r.values);
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let timestamps: (number | null)[] = [];
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values.forEach(v => v.forEach((row: number[]) => timestamps.push(row[0])));
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timestamps = timestamps.filter(function(item, i, ar) {
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return ar.indexOf(item) === i; //uniq values
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});
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for(let t of timestamps) {
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let row = [t];
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values.map(v => {
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if(v[0] === undefined) {
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row.push(0);
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}
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let currentTimestamp = v[0][0];
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let currentValue = v[0][1];
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if(currentTimestamp === t) {
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row.push(+currentValue);
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v.shift();
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} else {
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row.push(null);
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}
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});
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row[0] = +(row[0] as number) * 1000; //convert timestamp to ms
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result_matrix.values.push(row);
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};
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return result_matrix;
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}
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}
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