grafana-datasource.js

sample-datasource.js

// original code 
async query(options) {
    var query = await this.buildQueryParameters(options);
    if (query.targets.length <= 0) {
      return this.q.when({ data: [] });
    }

    return this.doRequest(query).then(result => {
      var res = []
      _.forEach(result.data.results, r => {
        _.forEach(r.series, s => {
          res.push({ target: s.name, datapoints: s.points })
        })
        _.forEach(r.tables, t => {
          t.type = 'table'
          t.refId = r.refId
          res.push(t)
        })
      })
      
      
// test code  with hardcoded data for log panel

import * as graf from '@grafana/data'

async query(options) {
  
      const MutableDataFrame = graf.MutableDataFrame;
      const FieldType = graf.FieldType;
      const frame = new MutableDataFrame({
        refId: query.refId,
        fields: [
          { name: 'time', type: FieldType.time },
          { name: 'content', type: FieldType.string, labels: { filename: 'file.txt' } }
        ],
      });

      frame.add({ time: 1589189388597, content: 'user registered' })
      frame.add({ time: 1589189406480, content: 'user logged in' })
      console.log('frame to JSON' , frame.toJSON())
      result.data = frame.toJSON()
      return result
    })
  }