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@utaal
Created October 23, 2011 14:08
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server health page (node & socket.io)
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
// });
// });
// }
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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)}})();
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;
}
<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>
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);
});
};
User-agent: *
Disallow: /
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