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if(typeof jrrd == 'undefined') {
var jrrd = {};
}
jrrd.downloadBinary = function(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;
};
jrrd.RrdQuery = function(rrd) {
this.rrd = rrd;
};
jrrd.RrdQuery.prototype.getData = function(startTime, endTime, dsId) {
var startTimestamp = startTime.getTime()/1000;
var endTimestamp = endTime.getTime()/1000;
if(dsId == null) {
dsId = 0;
}
var ds = this.rrd.getDS(dsId);
var consolidationFunc = 'AVERAGE';
var lastUpdated = this.rrd.getLastUpdate();
// If end time stamp is beyond the range of this rrd then reset it
if(lastUpdated < endTimestamp) {
endTimestamp = lastUpdated;
}
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);
}
var startRow = rraRowCount - parseInt((lastUpdated - startTimestamp)/step) - 1;
var endRow = rraRowCount - parseInt((lastUpdated - endTimestamp)/step) - 1;
var flotData = [];
var timestamp = firstUpdated + (startRow - 1) * step;
var dsIndex = ds.getIdx();
for (var i=startRow; i<=endRow; i++) {
var val = bestRRA.getEl(i, dsIndex);
flotData.push([timestamp*1000.0, val]);
timestamp += step;
}
return {label: ds.getName(), data: flotData};
};
jrrd.RrdQueryRemote = function(url) {
this.url = url;
this.lastUpdate = 0;
this._download = null;
};
jrrd.RrdQueryRemote.prototype.getData = function(startTime, endTime, dsId) {
var endTimestamp = endTime.getTime()/1000;
// Download the rrd if there has never been a download or if the last
// completed download had a lastUpdated timestamp less than the requested
// end time.
// Don't start another download if one is already in progress.
if(!this._download || (this._download.fired > -1 && this.lastUpdate < endTimestamp )) {
this._download = jrrd.downloadBinary(this.url)
.addCallback(
function(self, binary) {
// Upon successful download convert the resulting binary
// into an RRD file and pass it on to the next callback
// in the chain.
var rrd = new RRDFile(binary);
self.lastUpdate = rrd.getLastUpdate();
return rrd;
}, this);
}
// Set up a deferred which will call getData on the local RrdQuery object
// returning a flot compatible data object to the caller.
var ret = new MochiKit.Async.Deferred().addCallback(
function(startTime, endTime, dsId, rrd) {
return new jrrd.RrdQuery(rrd).getData(startTime, endTime, dsId);
}, startTime, endTime, dsId);
// Add a pair of callbacks to the current download which will callback the
// result which we setup above.
this._download.addBoth(
function(ret, res) {
if(res instanceof Error) {
ret.errback(res);
} else {
ret.callback(res);
}
return res;
}, ret);
return ret;
};
jrrd.RrdQueryDsProxy = function(rrdQuery, dsId) {
this.rrdQuery = rrdQuery;
this.dsId = dsId;
};
jrrd.RrdQueryDsProxy.prototype.getData = function(startTime, endTime) {
return this.rrdQuery.getData(startTime, endTime, this.dsId);
};
jrrd.Chart = function(template, options) {
this.template = template;
this.options = options;
this.data = [];
};
jrrd.Chart.prototype.addData = function(label, db) {
this.data.push([label, db]);
};
jrrd.Chart.prototype.draw = function(startTime, endTime) {
var results = [];
for(var i=0; i<this.data.length; i++) {
results.push(this.data[i][1].getData(startTime, endTime));
}
return MochiKit.Async.gatherResults(results)
.addCallback(
function(self, data) {
for(var i=0; i<data.length; i++) {
data[i].label = self.data[i][0];
}
var plot = $.plot(self.template, data, self.options);
}, this)
.addErrback(
function(self, failure) {
self.template.text('error: ' + failure.message);
}, this);
};
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