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- Try to dynamically size the histogram based on number of data points

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found. This will incur multiple backend queries if a happy range of
  data points is not found. Currently will try again with a new
  histogram interval if point count, x is outside range [6, 50]
This commit is contained in:
Jordan Sissel 2011-02-13 03:26:20 -08:00
parent 6d98b64514
commit ecb0afad5d
1 changed files with 43 additions and 13 deletions
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56
lib/logstash/web/public/js/logstash.js
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@ -29,20 +29,50 @@
if (options.graph != false) {
/* Load the default histogram graph */
jQuery.getJSON("/api/histogram", logstash.params, function(histogram, text, jqxhr) {
/* Load the data into the graph */
flot_data = [];
// histogram is an array of { "key": ..., "count": ... }
for (var i in histogram) {
flot_data.push([parseInt(histogram[i]["key"]), histogram[i]["count"]])
}
logstash.plot(flot_data);
});
logstash.params.interval = 3600000; /* 1 hour, default */
logstash.histogram();
} /* if options.graph != false */
$("#query").val(logstash.params.q);
}, /* search */
histogram: function(tries) {
if (typeof(tries) == 'undefined') {
tries = 5;
}
/* Uncomment to activate GeoCities mode on the graph while waiting . */
$("#visual").html("<center><img src='/media/truckconstruction.gif'><center>");
jQuery.getJSON("/api/histogram", logstash.params, function(histogram, text, jqxhr) {
/* Load the data into the graph */
flot_data = [];
// histogram is an array of { "key": ..., "count": ... }
for (var i in histogram) {
flot_data.push([parseInt(histogram[i]["key"]), histogram[i]["count"]])
}
//console.log("Histo:" + flot_data.length);
/* Try to be intelligent about how we choose the histogram interval.
* If there are too few data points, try a smaller interval.
* If there are too many data points, try a larger interval.
* Give up after a few tries and go with the last result.
*
* This queries the backend several times, but should be reasonably
* speedy as this behaves roughly as a binary search. */
if (flot_data.length < 6 && tries > 0) {
//console.log("Histogram bucket " + logstash.params.interval + " has only " + flot_data.length + " data points, trying smaller...");
logstash.params.interval /= 2;
logstash.histogram(tries - 1);
} else if (flot_data.length > 50 && tries > 0) {
//console.log("Histogram bucket " + logstash.params.interval + " too many (" + flot_data.length + ") data points, trying larger interval...");
logstash.params.interval *= 2;
logstash.histogram(tries - 1);
} else {
logstash.plot(flot_data, logstash.params.interval);
}
});
},
parse_params: function(href) {
var query = href.replace(/^[^?]*\?/, "");
if (query == href) {
@ -70,7 +100,7 @@
logstash.search(newquery.trim());
}, /* appendquery */
plot: function(data) {
plot: function(data, interval) {
var target = $("#visual");
target.css("display", "block");
var plot = $.plot(target,
@ -78,7 +108,7 @@
data: data,
bars: {
show: true,
barWidth: 3600000,
barWidth: interval,
}
} ],
{ /* options */
@ -90,7 +120,7 @@
target.bind("plotclick", function(e, pos, item) {
if (item) {
start = logstash.ms_to_iso8601(item.datapoint[0]);
end = logstash.ms_to_iso8601(item.datapoint[0] + 3600000);
end = logstash.ms_to_iso8601(item.datapoint[0] + interval);
/* Clicking on the graph means a new search, means
* we probably don't want to keep the old offset since