grafana/public/app/plugins/datasource/prometheus/specs/completer_specs.ts

import {describe, it, sinon, expect} from 'test/lib/common';

import {PromCompleter} from '../completer';
import {PrometheusDatasource} from '../datasource';

describe('Prometheus editor completer', function() {

  let sessionData = {
    currentToken: {},
    tokens: [],
    line: ''
  };
  let session = {
    getTokenAt: sinon.stub().returns(sessionData.currentToken),
    getTokens: sinon.stub().returns(sessionData.tokens),
    getLine: sinon.stub().returns(sessionData.line),
  };
  let editor = { session: session };

  let datasourceStub = <PrometheusDatasource>{
    performInstantQuery: sinon.stub().withArgs({ expr: '{__name__="node_cpu"' }).returns(Promise.resolve(
      [
        {
          metric: {
            job: 'node',
            instance: 'localhost:9100'
          }
        }
      ]
    )),
    performSuggestQuery: sinon.stub().withArgs('node', true).returns(Promise.resolve(
      [
        'node_cpu'
      ]
    ))
  };
  let completer = new PromCompleter(datasourceStub);

  describe("When inside brackets", () => {

    it("Should return range vectors", () => {
      completer.getCompletions(editor, session, { row: 0, column: 10 }, '[', (s, res) => {
        expect(res[0]).to.eql({caption: '1s', value: '[1s', meta: 'range vector'});
      });
    });

  });

  describe("When inside label matcher, and located at label name", () => {
    sessionData = {
      currentToken: { type: 'entity.name.tag', value: 'j', index: 2, start: 9 },
      tokens: [
        { type: 'identifier', value: 'node_cpu' },
        { type: 'paren.lparen', value: '{' },
        { type: 'entity.name.tag', value: 'j', index: 2, start: 9 },
        { type: 'paren.rparen', value: '}' }
      ],
      line: 'node_cpu{j}'
    };

    it("Should return label name list", () => {
      completer.getCompletions(editor, session, { row: 0, column: 10 }, 'j', (s, res) => {
        expect(res[0]).to.eql({caption: 'job', value: 'job', meta: 'label name'});
      });
    });

  });

  describe("When inside label matcher, and located at label name with __name__ match", () => {
    sessionData = {
      currentToken: { type: 'entity.name.tag', value: 'j', index: 5, start: 22 },
      tokens: [
        { type: 'paren.lparen', value: '{' },
        { type: 'entity.name.tag', value: '__name__' },
        { type: 'keyword.operator', value: '=~' },
        { type: 'string.quoted', value: '"node_cpu"' },
        { type: 'punctuation.operator', value: ',' },
        { type: 'entity.name.tag', value: 'j', 'index': 5, 'start': 22 },
        { type: 'paren.rparen', value: '}' }
      ],
      line: '{__name__=~"node_cpu",j}'
    };

    it("Should return label name list", () => {
      completer.getCompletions(editor, session, { row: 0, column: 23 }, 'j', (s, res) => {
        expect(res[0]).to.eql({caption: 'job', value: 'job', meta: 'label name'});
      });
    });

  });

  describe("When inside label matcher, and located at label value", () => {
    sessionData = {
      currentToken: { type: 'string.quoted', value: '"n"', index: 4, start: 13 },
      tokens: [
        { type: 'identifier', value: 'node_cpu' },
        { type: 'paren.lparen', value: '{' },
        { type: 'entity.name.tag', value: 'job' },
        { type: 'keyword.operator', value: '=' },
        { type: 'string.quoted', value: '"n"', index: 4, start: 13 },
        { type: 'paren.rparen', value: '}' }
      ],
      line: 'node_cpu{job="n"}'
    };

    it("Should return label value list", () => {
      completer.getCompletions(editor, session, { row: 0, column: 15 }, 'n', (s, res) => {
        expect(res[0]).to.eql({caption: 'node', value: 'node', meta: 'label value'});
      });
    });

  });

});