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Loki: Support for template variable queries (#20697)

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This commit is contained in:
Ivana Huckova
2019-12-03 09:40:22 +01:00
committed by GitHub
parent 5710e52c11
commit 45259f4362
3 changed files with 118 additions and 7 deletions
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51
public/app/plugins/datasource/loki/datasource.ts
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@@ -52,9 +52,12 @@ import LanguageProvider from './language_provider';
export type RangeQueryOptions = Pick<DataQueryRequest<LokiQuery>, 'range' | 'intervalMs' | 'maxDataPoints' | 'reverse'>;
export const DEFAULT_MAX_LINES = 1000;
const LEGACY_QUERY_ENDPOINT = '/api/prom/query';
const RANGE_QUERY_ENDPOINT = '/loki/api/v1/query_range';
const INSTANT_QUERY_ENDPOINT = '/loki/api/v1/query';
export const LEGACY_LOKI_ENDPOINT = '/api/prom';
export const LOKI_ENDPOINT = '/loki/api/v1';
const LEGACY_QUERY_ENDPOINT = `${LEGACY_LOKI_ENDPOINT}/query`;
const RANGE_QUERY_ENDPOINT = `${LOKI_ENDPOINT}/query_range`;
const INSTANT_QUERY_ENDPOINT = `${LOKI_ENDPOINT}/query`;
const DEFAULT_QUERY_PARAMS: Partial<LokiLegacyQueryRequest> = {
direction: 'BACKWARD',
@@ -76,9 +79,9 @@ interface LokiContextQueryOptions {
export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
private streams = new LiveStreams();
private version: string;
languageProvider: LanguageProvider;
maxLines: number;
version: string;
/** @ngInject */
constructor(
@@ -374,6 +377,46 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
};
}
async metricFindQuery(query: string) {
if (!query) {
return Promise.resolve([]);
}
const interpolated = this.templateSrv.replace(query, {}, this.interpolateQueryExpr);
return await this.processMetricFindQuery(interpolated);
}
async processMetricFindQuery(query: string) {
const labelNamesRegex = /^label_names\(\)\s*$/;
const labelValuesRegex = /^label_values\((?:(.+),\s*)?([a-zA-Z_][a-zA-Z0-9_]*)\)\s*$/;
const labelNames = query.match(labelNamesRegex);
if (labelNames) {
return await this.labelNamesQuery();
}
const labelValues = query.match(labelValuesRegex);
if (labelValues) {
return await this.labelValuesQuery(labelValues[2]);
}
return Promise.resolve([]);
}
async labelNamesQuery() {
const url = (await this.getVersion()) === 'v0' ? `${LEGACY_LOKI_ENDPOINT}/label` : `${LOKI_ENDPOINT}/label`;
const result = await this.metadataRequest(url);
return result.data.data.map((value: string) => ({ text: value }));
}
async labelValuesQuery(label: string) {
const url =
(await this.getVersion()) === 'v0'
? `${LEGACY_LOKI_ENDPOINT}/label/${label}/values`
: `${LOKI_ENDPOINT}/label/${label}/values`;
const result = await this.metadataRequest(url);
return result.data.data.map((value: string) => ({ text: value }));
}
interpolateQueryExpr(value: any, variable: any) {
// if no multi or include all do not regexEscape
if (!variable.multi && !variable.includeAll) {