polarblau · January 31, 2016 15:45
diff --git a/chart.html b/chart.html

 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>

 body {
  font: 10px sans-serif;
 }

 .axis path,
 .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
 }

 .x.axis path {
  display: none;
 }

 .line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
 }

 </style>
 <body>
 <script src="d3.js"></script>
 <script>

 var MAX_SPEED = 50;

 var margin = {top: 20, right: 100, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

 var color = d3.scale.category10();

 var formatDate = d3.time.format("%Y-%m-%dT%H:%M:%SZ");

 var x = d3.time.scale()
    .range([0, width]);

 var y = d3.scale.linear()
    .range([height, 0]);

 var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

 var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

 var line = d3.svg.line()
    .x(function(d) { return x(d.timestamp); })
    .y(function(d) { return y(d.speed); });

 var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");


 d3.csv("log.csv", type, function(error, data) {
  if (error) throw error;

  x.domain(d3.extent(data, function(d) { return d.timestamp; }));
  y.domain([0, MAX_SPEED]);

  color.domain(['download', 'upload']);

  var speeds = color.domain().map(function(name) {
    return {
      name: name,
      values: data.map(function(d) {
        return { timestamp: d.timestamp, speed: +d[name] };
      })
    };
  });

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Mbit/Second");

  var speed = svg.selectAll(".speed")
      .data(speeds)
    .enter().append("g")
      .attr("class", "speed");

  speed.append("path")
      .attr("class", "line")
      .attr("d", function(d) { return line(d.values); })
      .style("stroke", function(d) { return color(d.name); });


  speed.append("text")
      .datum(function(d) { return {name: d.name, value: d.values[d.values.length - 1]}; })
      .attr("transform", function(d) {
        return "translate(" + x(d.value.timestamp) + "," + y(d.value.speed) + ")";
      })
      .attr("x", 3)
      .attr("dy", ".35em")
      .text(function(d) {
        return d.name.charAt(0).toUpperCase() + d.name.slice(1);;
      });

 });

 function type(d) {
  d.timestamp = formatDate.parse(d.timestamp);
  return d;
 }

 </script>
diff --git a/log.csv b/log.csv
diff --git a/speed_test.sh b/speed_test.sh
 while true
 do
  ./speedtest_cli/speedtest_cli.py --simple |   # Run speed test
    egrep -o "([0-9]*\.[0-9]+|[0-9]+)" |        # Extract durations
    (date -u +"%Y-%m-%dT%H:%M:%SZ" && cat) |    # Prepend timestamp as ISO 8601
    tr '\n' ',' |                               # Join lines with commas
    sed 's/,$//' >> ./log.csv                   # Remove trailing comma and append to log
  sleep 60
 done

	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font: 10px sans-serif;
	}

	.axis path,
	.axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}

	.x.axis path {
	display: none;
	}

	.line {
	fill: none;
	stroke: steelblue;
	stroke-width: 1.5px;
	}

	</style>
	<body>
	<script src="d3.js"></script>
	<script>

	var MAX_SPEED = 50;

	var margin = {top: 20, right: 100, bottom: 30, left: 50},
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var color = d3.scale.category10();

	var formatDate = d3.time.format("%Y-%m-%dT%H:%M:%SZ");

	var x = d3.time.scale()
	.range([0, width]);

	var y = d3.scale.linear()
	.range([height, 0]);

	var xAxis = d3.svg.axis()
	.scale(x)
	.orient("bottom");

	var yAxis = d3.svg.axis()
	.scale(y)
	.orient("left");

	var line = d3.svg.line()
	.x(function(d) { return x(d.timestamp); })
	.y(function(d) { return y(d.speed); });

	var svg = d3.select("body").append("svg")
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom)
	.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");


	d3.csv("log.csv", type, function(error, data) {
	if (error) throw error;

	x.domain(d3.extent(data, function(d) { return d.timestamp; }));
	y.domain([0, MAX_SPEED]);

	color.domain(['download', 'upload']);

	var speeds = color.domain().map(function(name) {
	return {
	name: name,
	values: data.map(function(d) {
	return { timestamp: d.timestamp, speed: +d[name] };
	})
	};
	});

	svg.append("g")
	.attr("class", "x axis")
	.attr("transform", "translate(0," + height + ")")
	.call(xAxis);

	svg.append("g")
	.attr("class", "y axis")
	.call(yAxis)
	.append("text")
	.attr("transform", "rotate(-90)")
	.attr("y", 6)
	.attr("dy", ".71em")
	.style("text-anchor", "end")
	.text("Mbit/Second");

	var speed = svg.selectAll(".speed")
	.data(speeds)
	.enter().append("g")
	.attr("class", "speed");

	speed.append("path")
	.attr("class", "line")
	.attr("d", function(d) { return line(d.values); })
	.style("stroke", function(d) { return color(d.name); });


	speed.append("text")
	.datum(function(d) { return {name: d.name, value: d.values[d.values.length - 1]}; })
	.attr("transform", function(d) {
	return "translate(" + x(d.value.timestamp) + "," + y(d.value.speed) + ")";
	})
	.attr("x", 3)
	.attr("dy", ".35em")
	.text(function(d) {
	return d.name.charAt(0).toUpperCase() + d.name.slice(1);;
	});

	});

	function type(d) {
	d.timestamp = formatDate.parse(d.timestamp);
	return d;
	}

	</script>
	while true
	do
	./speedtest_cli/speedtest_cli.py --simple \| # Run speed test
	egrep -o "([0-9]*\.[0-9]+\|[0-9]+)" \| # Extract durations
	(date -u +"%Y-%m-%dT%H:%M:%SZ" && cat) \| # Prepend timestamp as ISO 8601
	tr '\n' ',' \| # Join lines with commas
	sed 's/,$//' >> ./log.csv # Remove trailing comma and append to log
	sleep 60
	done