/**
* Create a list with histogram results that would be serialized to JSON like this
*
* <p>[{ x: -1893456000, y: 92228531 }, { x: -1577923200, y: 106021568 }]
*/
protected List<Map<String, Long>> formatHistogramResults(
DateHistogramResult histogram, int maxDataPoints, boolean allQuery) {
final List<Map<String, Long>> points = Lists.newArrayList();
final Map<String, Long> histogramResults = histogram.getResults();
DateTime from;
if (allQuery) {
String firstTimestamp = histogramResults.entrySet().iterator().next().getKey();
from = new DateTime(Long.parseLong(firstTimestamp) * 1000, DateTimeZone.UTC);
} else {
from = DateTime.parse(histogram.getHistogramBoundaries().getFrom());
}
final DateTime to = DateTime.parse(histogram.getHistogramBoundaries().getTo());
final MutableDateTime currentTime = new MutableDateTime(from);
final Duration step = estimateIntervalStep(histogram.getInterval());
final int dataPoints = (int) ((to.getMillis() - from.getMillis()) / step.getMillis());
// using the absolute value guarantees, that there will always be enough values for the given
// resolution
final int factor =
(maxDataPoints != -1 && dataPoints > maxDataPoints) ? dataPoints / maxDataPoints : 1;
int index = 0;
floorToBeginningOfInterval(histogram.getInterval(), currentTime);
while (currentTime.isBefore(to) || currentTime.isEqual(to)) {
if (index % factor == 0) {
String timestamp = Long.toString(currentTime.getMillis() / 1000);
Long result = histogramResults.get(timestamp);
Map<String, Long> point = Maps.newHashMap();
point.put("x", Long.parseLong(timestamp));
point.put("y", result != null ? result : 0);
points.add(point);
}
index++;
nextStep(histogram.getInterval(), currentTime);
}
return points;
}
public Result histogram(
String q,
String rangeType,
int relative,
String from,
String to,
String keyword,
String interval,
String streamId,
int maxDataPoints) {
if (q == null || q.isEmpty()) {
q = "*";
}
// Interval.
if (interval == null
|| interval.isEmpty()
|| !SearchTools.isAllowedDateHistogramInterval(interval)) {
interval = "minute";
}
// Determine timerange type.
TimeRange timerange;
try {
timerange = TimeRange.factory(rangeType, relative, from, to, keyword);
} catch (InvalidRangeParametersException e2) {
return status(
400, views.html.errors.error.render("Invalid range parameters provided.", e2, request()));
} catch (IllegalArgumentException e1) {
return status(
400, views.html.errors.error.render("Invalid range type provided.", e1, request()));
}
String filter = null;
if (streamId != null && !streamId.isEmpty()) {
filter = "streams:" + streamId;
}
try {
UniversalSearch search = searchFactory.queryWithRangeAndFilter(q, timerange, filter);
DateHistogramResult histogram = search.dateHistogram(interval);
List<Map<String, Long>> results =
formatHistogramResults(histogram, maxDataPoints, relative == 0);
Map<String, Object> result = Maps.newHashMap();
AbsoluteRange boundaries = histogram.getHistogramBoundaries();
result.put("time", histogram.getTookMs());
result.put("interval", histogram.getInterval());
result.put("values", results);
result.put("from", boundaries.getFrom());
result.put("to", boundaries.getTo());
return ok(Json.toJson(result));
} catch (IOException e) {
return internalServerError("io exception");
} catch (APIException e) {
if (e.getHttpCode() == 400) {
// This usually means the field does not have a numeric type. Pass through!
return badRequest();
}
return internalServerError("api exception " + e);
}
}
