server health page (node & socket.io)

app.js

var http = require('http');
var connect = require('connect');
var socketio = require('socket.io');
var fs = require('fs');
var os = require('os');
var exec = require('child_process').exec;
var util = require('util');
var $ = require('underscore');

var load_data_in_mem_count = 3000;

function LOG(text) {
  if (typeof text === 'object') {
    text = "" + text + "\n # " + util.inspect(text).replace(/\n/g, "\n # ");
  }
  console.log("" + new Date() + " # " + text);
}

var osdata;
var cpus_initial = os.cpus();

(function() {
  osdata = {
    'hostname': os.hostname(),
    'type': os.type(),
    'release': os.release(),
    'totalmem': os.totalmem(),
    'cpus': $(cpus_initial).map(function(e) { return { 'model': e.model, 'speed': e.speed } })
  }
  LOG(osdata);
})();

var server = connect.createServer(
    connect.static(__dirname + '/public')
);

server.listen(9000);
var io = socketio.listen(server);

io.sockets.on('connection', function(socket) {
  io.sockets.emit('os', osdata);

  var i = (alive_for_ticks > load_data_in_mem_count) ?
    (cur_load_data_idx + 1) % load_data_in_mem_count : 0;
  for (; i != cur_load_data_idx; ++i, i %= load_data_in_mem_count) {
    console.log(i);
    socket.emit('load', load_data[i]);
  }
  socket.emit('load', load_data[cur_load_data_idx]);
  socket.emit('backlogcomplete', null);
  // socket.on('ps', function(data) {
  //   emit_ps(socket);
  // });
});

var load_data = [];
var cur_load_data_idx = -1;
var alive_for_ticks = 0;

function append_load_data(data) {
  cur_load_data_idx += 1; cur_load_data_idx %= load_data_in_mem_count;
  load_data[cur_load_data_idx] = data;
  alive_for_ticks += 1;
}

function gather_load_data() {
  var sum = function (a, b) { return a + b };
  var cpus = $(os.cpus()).map(function(e) { return e.times });
  var cpu_load_data = $(cpus).map(function(e) {
    var this_cpu = {};
    var totticks = $(e).map(function(value, key) { return value }).reduce(sum);
    $(e).map(function(value, key) { this_cpu[key] = value / totticks });
    return this_cpu;
  });
  var cpu_summary = {};
  $(cpu_load_data[0]).each(function(value, key) {
    cpu_summary[key] = $(cpu_load_data).map(function(e) { return e[key] }).reduce(sum) /
      cpu_load_data.length;
  });
  append_load_data({
    'ts': Date.now(),
    'uptime': os.uptime(),
    'loadavg': os.loadavg(),
    'totalmem': os.totalmem(),
    'freemem': os.freemem(),
    'random': Math.sin(Date.now() / 100000),
    'cpusummary': cpu_summary,
    'cpus': cpu_load_data
  });

  var cld = load_data[cur_load_data_idx];
  LOG(
    "up " + cld.uptime +
    " | loadavg " + cld.loadavg[0] +
    " | freemem " + cld.freemem +
    " " + (1 - cld.freemem / cld.totalmem) + " % used" +
    " | cpu user " + cld.cpusummary.user + " sys " + cld.cpusummary.sys);

  io.sockets.emit('load', load_data[cur_load_data_idx]);
}

gather_load_data();
setInterval(gather_load_data, 2000);

// function emit_ps(socket) {
//   exec('ps aux -A', function (error, stdout, stderr) {
//     socket.emit('ps', {
//       'stdout': stdout
//     });
//   });
// }

cubism.min.js

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d3.min.js

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fn((Math.floor(a/36e5-b)+b)*36e5)},function(a,b){a.setTime(a.getTime()+Math.floor(b)*36e5)},function(a){return a.getHours()}),d3.time.hours=d3.time.hour.range,d3.time.hours.utc=d3.time.hour.utc.range,d3.time.day=f$(function(a){return new fn(a.getFullYear(),a.getMonth(),a.getDate())},function(a,b){a.setDate(a.getDate()+b)},function(a){return a.getDate()-1}),d3.time.days=d3.time.day.range,d3.time.days.utc=d3.time.day.utc.range,d3.time.dayOfYear=function(a){var b=d3.time.year(a);return Math.floor((a-b)/864e5-(a.getTimezoneOffset()-b.getTimezoneOffset())/1440)},fB.forEach(function(a,b){a=a.toLowerCase(),b=7-b;var c=d3.time[a]=f$(function(a){return(a=d3.time.day(a)).setDate(a.getDate()-(a.getDay()+b)%7),a},function(a,b){a.setDate(a.getDate()+Math.floor(b)*7)},function(a){var c=d3.time.year(a).getDay();return Math.floor((d3.time.dayOfYear(a)+(c+b)%7)/7)-(c!==b)});d3.time[a+"s"]=c.range,d3.time[a+"s"].utc=c.utc.range,d3.time[a+"OfYear"]=function(a){var c=d3.time.year(a).getDay();return Math.floor((d3.time.dayOfYear(a)+(c+b)%7)/7)}}),d3.time.week=d3.time.sunday,d3.time.weeks=d3.time.sunday.range,d3.time.weeks.utc=d3.time.sunday.utc.range,d3.time.weekOfYear=d3.time.sundayOfYear,d3.time.month=f$(function(a){return new fn(a.getFullYear(),a.getMonth(),1)},function(a,b){a.setMonth(a.getMonth()+b)},function(a){return a.getMonth()}),d3.time.months=d3.time.month.range,d3.time.months.utc=d3.time.month.utc.range,d3.time.year=f$(function(a){return new fn(a.getFullYear(),0,1)},function(a,b){a.setFullYear(a.getFullYear()+b)},function(a){return a.getFullYear()}),d3.time.years=d3.time.year.range,d3.time.years.utc=d3.time.year.utc.range;var gg=[1e3,5e3,15e3,3e4,6e4,3e5,9e5,18e5,36e5,108e5,216e5,432e5,864e5,1728e5,6048e5,2592e6,7776e6,31536e6],gh=[[d3.time.second,1],[d3.time.second,5],[d3.time.second,15],[d3.time.second,30],[d3.time.minute,1],[d3.time.minute,5],[d3.time.minute,15],[d3.time.minute,30],[d3.time.hour,1],[d3.time.hour,3],[d3.time.hour,6],[d3.time.hour,12],[d3.time.day,1],[d3.time.day,2],[d3.time.week,1],[d3.time.month,1],[d3.time.month,3],[d3.time.year,1]],gi=[[d3.time.format("%Y"),function(a){return!0}],[d3.time.format("%B"),function(a){return a.getMonth()}],[d3.time.format("%b %d"),function(a){return a.getDate()!=1}],[d3.time.format("%a %d"),function(a){return a.getDay()&&a.getDate()!=1}],[d3.time.format("%I %p"),function(a){return a.getHours()}],[d3.time.format("%I:%M"),function(a){return a.getMinutes()}],[d3.time.format(":%S"),function(a){return a.getSeconds()}],[d3.time.format(".%L"),function(a){return a.getMilliseconds()}]],gj=d3.scale.linear(),gk=gd(gi);gh.year=function(a,b){return gj.domain(a.map(gf)).ticks(b).map(ge)},d3.time.scale=function(){return ga(d3.scale.linear(),gh,gk)};var gl=gh.map(function(a){return[a[0].utc,a[1]]}),gm=[[d3.time.format.utc("%Y"),function(a){return!0}],[d3.time.format.utc("%B"),function(a){return a.getUTCMonth()}],[d3.time.format.utc("%b %d"),function(a){return a.getUTCDate()!=1}],[d3.time.format.utc("%a %d"),function(a){return a.getUTCDay()&&a.getUTCDate()!=1}],[d3.time.format.utc("%I %p"),function(a){return a.getUTCHours()}],[d3.time.format.utc("%I:%M"),function(a){return a.getUTCMinutes()}],[d3.time.format.utc(":%S"),function(a){return a.getUTCSeconds()}],[d3.time.format.utc(".%L"),function(a){return a.getUTCMilliseconds()}]],gn=gd(gm);gl.year=function(a,b){return gj.domain(a.map(gp)).ticks(b).map(go)},d3.time.scale.utc=function(){return ga(d3.scale.linear(),gl,gn)}})();

index.css

body {
  font-family: monospace;
  padding: 20px;
}

p {
  margin: 0;
}

.horizon {
border-bottom: solid 1px #000;
overflow: hidden;
position: relative;
}

.horizon {
border-top: solid 1px #000;
border-bottom: solid 1px #000;
}

.horizon + .horizon {
border-top: none;
}

.horizon canvas {
display: block;
}

.horizon .title,
.horizon .value {
bottom: 0;
line-height: 30px;
margin: 0 6px;
position: absolute;
text-shadow: 0 1px 0 rgba(255,255,255,.5);
white-space: nowrap;
    }

    .horizon .title {
      left: 0;
      }

      .horizon .value {
        right: 0;
        }

        .axis {
            font: 10px sans-serif;
          }

          .axis text {
              -webkit-transition: fill-opacity 250ms linear;
            }

            .axis path {
                display: none;
              }

              .axis line {
                  stroke: #000;
                    shape-rendering: crispEdges;
                  }

index.html

<html>
  <head>
    <title>server status</title>
    <link rel="stylesheet" type="text/css" href="index.css" />
    <script type="text/javascript" src="/socket.io/socket.io.js"></script>
    <script type="text/javascript" src="d3.min.js"></script>
    <script type="text/javascript" src="cubism.min.js"></script>
    <script type="text/javascript" src="index.js"></script>
  </head>
  <body>
    <div id="server-info">
      <p><span id="os-hostname"></span> (<span id="os-release"></span>)</p>
      <p>uptime: <span id="os-uptime"></span></p>
      <p>free mem: <span id="os-mem-free"></span> / <span id="os-mem-total"></span></p>
      <p>loadavg 1/5/15min: <span id="os-loadavg"></span></p>  
    </div>
    <br/>
    <div id="chart">
    </div>
    <br/>
    <!--<div>
      <a id="stdout-ps-update" href="#" onclick="stdout_ps_update()">ps aux</a>
      <pre id="stdout-ps"></pre>
    </div>-->

  </body>
</html>

index.js

var d3$ = function(selector) { return d3.select(selector) };
var socket = io.connect();

window.onload = function() {

var ki = 1024 * 1024;

var osdata;

socket.on('os', function(data) {
  osdata = data;
  // history_freemem.push(data.freemem);
  // if (history_freemem.length > max_history) history_freemem.shift();

  // var os_string = data.hostname + " (" + data.type + " " + data.release + ")";
  d3$('#os-hostname').text(data.hostname);
  d3$('#os-release').text(data.type + " " + data.release);
  d3$('#os-mem-total').text(data.totalmem / ki + " MiB"); 
  // 
  // var vis_freemem_y = d3.scale.linear()
  //   .domain([0, data.totalmem])
  //   .range([vis_h, 0]);
  // vis_freemem.selectAll('rect')
  //     .data(history_freemem)
  //   .enter().append('svg:rect')
  //     .attr('x', function(d, i) { return i * 2; })
  //     .attr('height', vis_freemem_y)
  //     .attr('width', 2);
});

var load_data = [];
var load_data_start_time_secs = -1;
var load_data_step_secs;

function cubism_source(context) {
  var source = {};
  source.metric = function(expression, title) {
    var metric = context.metric(function(start, stop, step, callback) {
      var storage_index_start = 
        ((start.getTime() / 1000) - load_data_start_time_secs) / load_data_step_secs;
      var storage_index_stop =
        ((stop.getTime() / 1000) - load_data_start_time_secs) / load_data_step_secs;
      console.log(storage_index_start, storage_index_stop);
      var real_data = load_data
        .slice(storage_index_start, storage_index_stop)
        .map(function(e) { return eval(expression) });
      var vals = [];
      for (var i = storage_index_start; i < 0; ++i) {
        console.log(i);
        vals.push(0);
      }
      vals = vals.concat(real_data);
      console.log(real_data,vals);
      callback(null, vals);
    });
    metric.toString = function() { return title; };
    return metric;
  };
  return source;
}

function setup_cubism() {
  var context = cubism.context()
    .serverDelay(0) // allow 30 seconds of collection lag
    .clientDelay(3)
    .step(2 * 1000) // two seconds per value
    .size(800); // fetch 1920 values (1080p)
  var source = cubism_source(context);
  var horizon_green = context.horizon()
    .height(60).mode("offset").extent([-1, 1]).colors(['#77ff77', '#77ff77']);
  var horizon_red = context.horizon()
    .height(60).mode("offset").extent([-1, 1]).colors(['#ff7777', '#ff7777']);

  var full = context.constant(1);
  var cpuidle = source.metric('e.cpusummary.idle', 'idle');
  var cpuuser = source.metric('e.cpusummary.user', 'cpu: user ticks');
  var cpusys = source.metric('e.cpusummary.sys', 'cpu: sys ticks');
  var usedmemp = source.metric('1 - (e.freemem / e.totalmem)', 'used memory ratio');
  var usedmem = source.metric('e.totalmem - e.freemem', 'used memory');
  var usedcpu = full.subtract(cpuidle);
  usedcpu.toString = function() { return "cpu" };

  d3$('#chart').call(function(div) {
     div.append("div")
          .attr("class", "axis")
          .call(context.axis().orient("top"));
    div.append("div").datum(usedcpu)
      .attr("class", "horizon").call(horizon_red);
    div.selectAll(".horizion")
      .data([usedmemp])
      .enter().append("div").attr("class", "horizon").call(horizon_red);
    div.append("div").datum(usedmem).attr("class", "horizon").call(
      context.horizon().height(60).mode("offset")
        .extent([-osdata.totalmem, osdata.totalmem])
      );
  });
}

var load_data_step_secs = 2;
socket.on('load', function(data) {
  var loadavg = data.loadavg;
  d3$('#os-loadavg').text(data.loadavg[0] + " / " + data.loadavg[1] + " / " + data.loadavg[2]);
  var uptime = {
    d: Math.floor(data.uptime / 24 / 60 / 60),
    h: Math.floor(data.uptime / 60 / 60) % 24,
    m: Math.floor(data.uptime / 60) % 60,
    s: data.uptime % 60
  };
  d3$('#os-uptime').text(uptime.d + "d " + uptime.h + "h" + uptime.m + "m" + uptime.s);
  d3$('#os-mem-free').text(data.freemem / ki + " MiB"); 

  if (load_data_start_time_secs == -1) load_data_start_time_secs = data.ts / 1000;
  console.log(load_data_start_time_secs);
  load_data.push(data);
});

socket.on('backlogcomplete', function(data) {
  setup_cubism();
});

stdout_ps_update = function() {
  socket.emit('ps');
}

socket.on('ps', function(data) {
  d3$('#stdout-ps').text(data.stdout);
});

};

robots.txt

User-agent: *
Disallow: /