kibana-123/src/server/logging/log_reporter.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

import _ from 'lodash';

import { Squeeze } from 'good-squeeze';
import { createWriteStream as writeStr } from 'fs';

import LogFormatJson from './log_format_json';
import LogFormatString from './log_format_string';
import { LogInterceptor } from './log_interceptor';

module.exports = class KbnLogger {
  constructor(events, config) {
    this.squeeze = new Squeeze(events);
    this.format = config.json ? new LogFormatJson(config) : new LogFormatString(config);
    this.logInterceptor = new LogInterceptor();

    if (config.dest === 'stdout') {
      this.dest = process.stdout;
    } else {
      this.dest = writeStr(config.dest, {
        flags: 'a',
        encoding: 'utf8'
      });
    }
  }

  init(readstream, emitter, callback) {

    this.output = readstream
      .pipe(this.logInterceptor)
      .pipe(this.squeeze)
      .pipe(this.format);

    this.output.pipe(this.dest);

    emitter.on('stop', () => {
      this.output.unpipe(this.dest);
    });

    callback();
  }
};