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import { DatasourceConnector, Datasource, DatasourceQuery, DataTable } from '.';
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import { processSQLLimitOffset } from './utils';
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import * as _ from 'lodash';
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// as of 26.09.2020, it works for all SQL datasources
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export class SqlConnector extends DatasourceConnector {
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private _targetName: string; //save first target name, while multi metric not implemented
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private url: string;
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constructor(datasource: Datasource, targets: any[]) {
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super(datasource, targets);
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this.url = datasource.url;
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if(targets.length === 0) {
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throw Error('got empty targets list');
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}
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this._targetName = targets[0].refId;
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}
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getQuery(from: number, to: number, limit: number, offset: number): DatasourceQuery {
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let queries = this.targets;
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_.forEach(queries, q => {
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q.rawSql = processSQLLimitOffset(q.rawSql, limit, offset);
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if (!q.datasourceId) {
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q.datasourceId = this.datasource.datasourceId;
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}
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});
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return {
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url: this.url,
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method: 'POST',
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schema: {
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data: {
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from: String(from),
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to: String(to),
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queries: queries,
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}
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}
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};
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}
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parseResponse(res): DataTable {
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let emptyResult = {
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columns: ['timestamp', 'target'],
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values: []
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};
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if(res.data === undefined || res.data.results.length < 1) {
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console.log('datasource return empty response, no data');
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return emptyResult;
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}
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// TODO: support more than 1 metric (each res.data.results item is a metric)
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let results = res.data.results[this._targetName];
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if (_.isEmpty(results.frames)) {
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return emptyResult;
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}
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const frame = results.frames[0];
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return {
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columns: frame.schema.fields.map(field => field.name),
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// @ts-ignore
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values: _.zip(...frame.data.values),
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};
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}
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}
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