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grafana/public/app/features/expressions/ExpressionDatasource.ts

45 lines
1.3 KiB

import { DataSourceInstanceSettings, DataSourcePluginMeta } from '@grafana/data';
import { ExpressionQuery, GELQueryType } from './types';
import { ExpressionQueryEditor } from './ExpressionQueryEditor';
import { DataSourceWithBackend } from '@grafana/runtime';
/**
* This is a singleton instance that just pretends to be a DataSource
*/
export class ExpressionDatasourceApi extends DataSourceWithBackend<ExpressionQuery> {
constructor(instanceSettings: DataSourceInstanceSettings) {
super(instanceSettings);
}
getCollapsedText(query: ExpressionQuery) {
return `Expression: ${query.type}`;
}
newQuery(): ExpressionQuery {
return {
refId: '--', // Replaced with query
type: GELQueryType.math,
datasource: ExpressionDatasourceID,
};
}
}
// MATCHES the constant in DataSourceWithBackend
export const ExpressionDatasourceID = '__expr__';
export const expressionDatasource = new ExpressionDatasourceApi({
id: -100,
name: ExpressionDatasourceID,
} as DataSourceInstanceSettings);
expressionDatasource.meta = {
id: ExpressionDatasourceID,
info: {
logos: {
small: 'public/img/icn-datasource.svg',
large: 'public/img/icn-datasource.svg',
},
},
} as DataSourcePluginMeta;
expressionDatasource.components = {
QueryEditor: ExpressionQueryEditor,
};