obniz/obniz/libs/measurements/measure.js

obniz sdk for javascript

const ObnizUtil = require('../utils/util');

class ObnizMeasure {
  constructor(obniz) {
    this.obniz = obniz;
    this._reset();
  }

  _reset() {
    this.observers = [];
  }

  echo(params) {
    let err = ObnizUtil._requiredKeys(params, [
      'io_pulse',
      'pulse',
      'pulse_width',
      'io_echo',
      'measure_edges',
    ]);
    if (err) {
      throw new Error(
        "Measure start param '" + err + "' required, but not found "
      );
    }
    this.params = ObnizUtil._keyFilter(params, [
      'io_pulse',
      'pulse',
      'pulse_width',
      'io_echo',
      'measure_edges',
      'timeout',
      'callback',
    ]);

    let echo = {};
    echo.io_pulse = this.params.io_pulse;
    echo.pulse = this.params.pulse;
    echo.pulse_width = this.params.pulse_width;
    echo.io_echo = this.params.io_echo;
    echo.measure_edges = this.params.measure_edges;
    if (typeof this.params.timeout === 'number') {
      echo.timeout = this.params.timeout;
    }

    this.obniz.send({
      measure: {
        echo: echo,
      },
    });

    if (this.params.callback) {
      this.observers.push(this.params.callback);
    }
  }

  notified(obj) {
    let callback = this.observers.shift();
    if (callback) {
      callback(obj.echo);
    }
  }
}
module.exports = ObnizMeasure;