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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "jsonwriter.h"
#include "countmetric.h"
#include "valuemetric.h"
#include "metricsnapshot.h"
#include <iterator>
#include <cassert>
namespace metrics {
JsonWriter::JsonWriter(vespalib::JsonStream& stream)
: _stream(stream),
_flag(NOT_STARTED),
_dimensionStack(),
_period(0)
{
}
bool
JsonWriter::visitSnapshot(const MetricSnapshot& snapshot)
{
_stream << Object()
<< "snapshot" << Object()
<< "from" << vespalib::count_s(snapshot.getFromTime().time_since_epoch())
<< "to" << vespalib::count_s(snapshot.getToTime().time_since_epoch())
<< End()
<< "values" << Array();
_flag = SNAPSHOT_STARTED;
_period = vespalib::count_s(snapshot.getPeriod()); // Only prints second resolution
return true;
}
void
JsonWriter::doneVisitingSnapshot(const MetricSnapshot&)
{
assert(_flag == SNAPSHOT_STARTED);
_stream << End() << End();
_flag = NOT_STARTED;
_period = 0;
}
bool
JsonWriter::visitMetricSet(const MetricSet& set, bool)
{
_dimensionStack.push_back(set.getTags());
return true;
}
void
JsonWriter::doneVisitingMetricSet(const MetricSet&)
{
_dimensionStack.pop_back();
}
void
JsonWriter::writeCommonPrefix(const Metric& m)
{
if (_flag == NOT_STARTED) {
_stream << Array();
_flag = METRICS_WRITTEN;
}
_stream << Object()
<< "name" << m.getPath()
<< "description" << m.getDescription();
}
void
JsonWriter::writeDimensions(const DimensionSet& dimensions)
{
for (const auto& dimension : dimensions) {
if (!dimension.key().empty() && !dimension.value().empty()) {
_stream << dimension.key() << dimension.value();
}
}
}
void
JsonWriter::writeInheritedDimensions()
{
for (const auto& dimensions : _dimensionStack) {
writeDimensions(dimensions);
}
}
void
JsonWriter::writeMetricSpecificDimensions(const Metric& m)
{
if (isLeafMetric(m)) {
writeDimensions(m.getTags());
}
}
void
JsonWriter::writeCommonPostfix(const Metric& m)
{
_stream << "dimensions" << Object();
writeInheritedDimensions();
writeMetricSpecificDimensions(m);
_stream << End() << End();
}
bool
JsonWriter::visitCountMetric(const AbstractCountMetric& m, bool)
{
writeCommonPrefix(m);
uint64_t count = m.getLongValue("count");
_stream << "values" << Object()
<< "count" << count;
if (_period > 0) {
uint64_t rate = 1000000 * count / _period;
_stream << "rate" << (rate / 1000000.0);
}
_stream << End();
writeCommonPostfix(m);
return true;
}
bool
JsonWriter::visitValueMetric(const AbstractValueMetric& m, bool)
{
writeCommonPrefix(m);
MetricValueClass::UP values(m.getValues());
_stream << "values" << Object()
<< "average";
if (values->getLongValue("count") == 0) {
_stream << 0.0;
} else {
_stream << (values->getDoubleValue("total")
/ values->getDoubleValue("count"));
}
_stream << "sum" << values->getDoubleValue("total");
_stream << "count";
values->output("count", _stream);
if (_period > 0) {
uint64_t rate = 1000000 * values->getLongValue("count") / _period;
_stream << "rate" << (rate / 1000000.0);
}
_stream << "min";
values->output("min", _stream);
_stream << "max";
values->output("max", _stream);
_stream << "last";
values->output("last", _stream);
_stream << End();
writeCommonPostfix(m);
return true;
}
void
JsonWriter::doneVisiting()
{
if (_flag == METRICS_WRITTEN) {
_stream << End();
_flag = NOT_STARTED;
}
assert(_flag == NOT_STARTED);
}
} // metrics
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