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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>untitled</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<script type="text/javascript" src="assets/javascript/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="assets/javascript/flot/excanvas.min.js"></script>
<script type="text/javascript" src="assets/javascript/flot/jquery.flot.min.js"></script>
<script type="text/javascript" src="assets/javascript/flot/jquery.flot.selection.min.js"></script>
<script type="text/javascript" src="assets/javascript/javascriptrrd/binaryXHR.js"></script>
<script type="text/javascript" src="assets/javascript/javascriptrrd/rrdFile.js"></script>
<script type="text/javascript" src="assets/javascript/MochiKit/Base.js"></script>
<script type="text/javascript" src="assets/javascript/MochiKit/Async.js"></script>
<script type="text/javascript">
function downloadBinary(url) {
var d = new MochiKit.Async.Deferred();
$.ajax({
url: url,
dataType: 'text',
cache: false,
beforeSend: function(request) {
try {
request.overrideMimeType('text/plain; charset=x-user-defined');
} catch(e) {
// IE doesn't support overrideMimeType
}
},
success: function(data) {
try {
d.callback(new BinaryFile(data));
} catch(e) {
d.errback(e);
}
},
error: function(xhr, textStatus, errorThrown) {
// Special case for IE which handles binary data slightly
// differently.
if(textStatus == 'parsererror') {
if (typeof xhr.responseBody != 'undefined') {
return this.success(xhr.responseBody);
}
}
d.errback(new Error(xhr.status));
}
});
return d;
}
var RrdQuery = function(rrd) {
this.rrd = rrd;
}
RrdQuery.prototype = {
getData: function(startTime, endTime) {
var startTimestamp = startTime.getTime()/1000;
var endTimestamp = endTime.getTime()/1000;
var consolidationFunc = 'AVERAGE';
var lastUpdated = this.rrd.getLastUpdate();
var bestRRA = null;
for(var i=0; i<this.rrd.getNrRRAs(); i++) {
// Look through all RRAs looking for the most suitable
// data resolution.
var rra = this.rrd.getRRA(i);
if(rra.getCFName() != consolidationFunc) {
continue;
}
bestRRA = rra;
var step = rra.getStep();
var rraRowCount = rra.getNrRows();
var firstUpdated = lastUpdated - (rraRowCount - 1) * step;
if(firstUpdated <= startTimestamp) {
break;
}
}
if(!bestRRA) {
throw new Error('Unrecognised consolidation function: ' + consolidationFunc);
}
startRow = rraRowCount - parseInt((lastUpdated - startTimestamp)/step);
endRow = rraRowCount - parseInt((lastUpdated - endTimestamp)/step);
returnData = [];
for(var d=this.rrd.getNrDSs()-1; d>=0; d--) {
flotData = [];
timestamp = firstUpdated + (startRow - 1) * step;
for (var i=startRow; i<=endRow; i++) {
var val = bestRRA.getEl(i, d);
flotData.push([timestamp*1000.0, val]);
timestamp += step;
}
returnData.push({label: this.rrd.getDS(d).getName(), data: flotData});
}
return returnData;
}
};
var RrdQueryRemote = function(url) {
this.url = url;
this.rrd = null;
}
RrdQueryRemote.prototype = {
getData: function(startTime, endTime) {
var endTimestamp = endTime.getTime()/1000;
var d, self = this;
if(!this.rrd || this.rrd.getLastUpdate() < endTimestamp) {
d = downloadBinary(this.url)
.addCallback(
function(binary) {
var rrd = new RRDFile(binary);
self.rrd = rrd;
return rrd;
});
} else {
d = new MochiKit.Async.Deferred()
d.callback(this.rrd);
}
d.addCallback(
function(rrd) {
return new RrdQuery(rrd).getData(startTime, endTime);
});
return d;
}
};
var graphOptions = {
grid: {
clickable: true
},
selection: {
mode: 'x'
},
series: {
points: { show: false },
lines: {
show: true,
steps: false,
shadowSize: 0,
lineWidth: 1
},
shadowSize: 0
},
xaxis: {
mode: "time"
}
};
function drawChart(db, startTime, endTime) {
return db.getData(startTime, endTime)
.addCallback(
function(data) {
var plot = $.plot($('.container'), data, graphOptions);
})
.addErrback(
function(failure) {
$('.container').text('error: ' + failure.message);
});
}
var db = new RrdQueryRemote('data/localhost/load/load.rrd');
$(function() {
drawChart(db, new Date('7 April 2010 09:30:00'),
new Date('7 April 2010 15:00:00'));
$('.container').bind('plotclick', function(event, pos, item) {
if (item) {
console.log(['X: ' + new Date(item.datapoint[0]), 'Y: ' + item.datapoint[1]]);
}
});
$('.container').bind("plotselected", function(event, ranges) {
var startTime = new Date(ranges.xaxis.from);
var endTime = new Date(ranges.xaxis.to);
drawChart(db, startTime, endTime);
console.log("You selected " + startTime + " to " + endTime);
});
});
</script>
</head>
<body>
<div class="container" style="width:100%; height:200px;"></div>
</body>
</html>
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