sls-dev-tools/lib/components/errorDonutChart.js

The Dev Tools for the Serverless World

"use strict";

const contrib = require("blessed-contrib");

class ErrorDonutChart {
  constructor(application, layout, cloudwatch, width, height) {
    this.application = application;
    this.layout = layout;
    this.cloudwatch = cloudwatch;
    this.width = width;
    this.height = height;
    this.chart = this.generateChart();
  }

  generateChart() {
    const donutChart = contrib.donut({
      label: "Errors/Invocations ratio",
      radius: 20,
      arcWidth: 10,
      spacing: 4,
      remainColor: "green",
      border: "line",
      style: {
        fg: "green",
        border: {
          fg: "green"
        }
      },
      width: this.width,
      height: this.height
    });
    this.layout.append(donutChart);
    return donutChart;
  }

  updateData(metrics) {
    const invocationCount = metrics.MetricDataResults[1].Values.reduce((count, numberOfInvocationsOnPeriod) => count + numberOfInvocationsOnPeriod, 0);
    const errorCount = metrics.MetricDataResults[0].Values.reduce((count, numberOfErrorsOnPeriod) => count + numberOfErrorsOnPeriod, 0);

    if (invocationCount === 0) {
      this.chart.update([{
        percent: 0,
        label: "Errors/Invocations",
        color: "red"
      }]);
    } else {
      this.chart.update([{
        percent: Math.round(errorCount / invocationCount * 100),
        label: "Errors/Invocations",
        color: "red"
      }]);
    }
  }

}

module.exports = {
  ErrorDonutChart
};