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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2020-2023 Payara Foundation and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://github.com/payara/Payara/blob/main/LICENSE.txt
* See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* The Payara Foundation designates this particular file as subject to the "Classpath"
* exception as provided by the Payara Foundation in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
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package fish.payara.microprofile.metrics.writer;
import static fish.payara.microprofile.metrics.MetricUnitsUtils.scaleToBaseUnit;
import fish.payara.microprofile.metrics.impl.HistogramImpl;
import fish.payara.microprofile.metrics.impl.TimerImpl;
import fish.payara.microprofile.metrics.impl.WeightedSnapshot;
import java.io.PrintWriter;
import java.io.Writer;
import java.math.BigDecimal;
import java.time.Duration;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.function.LongSupplier;
import java.util.function.Supplier;
import java.util.logging.Level;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.eclipse.microprofile.metrics.Counter;
import org.eclipse.microprofile.metrics.Gauge;
import org.eclipse.microprofile.metrics.Histogram;
import org.eclipse.microprofile.metrics.Metadata;
import org.eclipse.microprofile.metrics.Metric;
import org.eclipse.microprofile.metrics.MetricID;
import org.eclipse.microprofile.metrics.MetricUnits;
import org.eclipse.microprofile.metrics.Sampling;
import org.eclipse.microprofile.metrics.Snapshot;
import org.eclipse.microprofile.metrics.Tag;
import org.eclipse.microprofile.metrics.Timer;
/**
* Writes {@link Metric}s according to the OpenMetrics standard as defined in microprofile-metrics-spec-2.3.pdf.
*
* The append method code is organised so that its output is reflected in the use of
* {@link #appendHELP(String, Metadata)}, {@link #appendTYPE(String, OpenMetricsType)} and
* {@link #appendValue(String, Tag[], Number)} which each emit a single output line.
*
* @author Jan Bernitt
* @since 5.202
*/
public class OpenMetricsExporter implements MetricExporter {
protected enum OpenMetricsType {
counter, gauge, summary, histogram
}
protected final String scope;
protected final PrintWriter out;
protected final Set typeWrittenByGlobalName;
protected final Set helpWrittenByGlobalName;
private static final String GC_TOTAL_ID = "gc_total";
private static final String GC_TIME_SECONDS_TOTAL_ID = "gc_time_seconds_total";
public OpenMetricsExporter(Writer out) {
this(null, out instanceof PrintWriter ? (PrintWriter) out : new PrintWriter(out), new HashSet<>(), new HashSet<>());
}
protected OpenMetricsExporter(String scope, PrintWriter out, Set typeWrittenByGlobalName,
Set helpWrittenByGlobalName) {
this.scope = scope;
this.out = out;
this.typeWrittenByGlobalName = typeWrittenByGlobalName;
this.helpWrittenByGlobalName = helpWrittenByGlobalName;
}
@Override
public MetricExporter in(String scope, boolean asNode) {
return new OpenMetricsExporter(scope, out, typeWrittenByGlobalName, helpWrittenByGlobalName);
}
@Override
public void exportComplete() {
// noop
}
@Override
public void export(MetricID metricID, Counter counter, Metadata metadata) {
String total = globalName(metricID, metadata, "_total");
appendTYPE(total, OpenMetricsType.counter);
appendHELP(total, metadata);
appendValue(total, metricID.getTagsAsArray(), scaleToBaseUnit((double)counter.getCount(), metadata));
}
@Override
public void export(MetricID metricID, Gauge gauge, Metadata metadata) {
Object value = null;
try {
value = gauge.getValue();
} catch (IllegalStateException ex) {
// The forwarding gauge is unloaded
return;
}
if (!(value instanceof Number)) {
LOGGER.log(Level.FINER, "Skipping OpenMetrics output for Gauge: {0} of type {1}",
new Object[] { metricID, value.getClass() });
return;
}
String valueName = globalName(metricID, metadata);
appendTYPE(valueName, OpenMetricsType.gauge);
appendHELP(valueName, metadata);
appendValue(valueName, metricID.getTagsAsArray(), scaleToBaseUnit((Number) value, metadata));
}
@Override
public void export(MetricID metricID, Histogram histogram, Metadata metadata) {
exportSampling(metricID, histogram, histogram::getCount, histogram::getSum, metadata);
}
private void exportSampling(MetricID metricID, Sampling sampling, LongSupplier count, Supplier sum, Metadata metadata) {
Tag[] tags = metricID.getTagsAsArray();
Snapshot snapshot = sampling.getSnapshot();
String mean = globalName(metricID, metadata, "_mean");
appendTYPE(mean, OpenMetricsType.gauge);
appendValue(mean, tags, scaleToBaseUnit(snapshot.getMean(), metadata));
String max = globalName(metricID, metadata, "_max");
appendTYPE(max, OpenMetricsType.gauge);
appendHELP(max, metadata);
appendValue(max, tags, scaleToBaseUnit(snapshot.getMax(), metadata));
String summary = globalName(metricID, metadata);
appendHELP(summary, metadata);
Snapshot.PercentileValue[] percentileValues = snapshot.percentileValues();
if (snapshot instanceof WeightedSnapshot) {
WeightedSnapshot w = (WeightedSnapshot) snapshot;
if (w.getConfigAdapter() != null) {
if (w.bucketValues() != null && w.bucketValues().length > 0) {
appendTYPE(summary, OpenMetricsType.histogram);
printCustomPercentile(percentileValues, summary, tags, metadata);
printBuckets(snapshot.bucketValues(), globalName(metricID, metadata, "_bucket"),
tags, metadata, sampling, count);
} else {
appendTYPE(summary, OpenMetricsType.summary);
printCustomPercentile(percentileValues, summary, tags, metadata);
}
} else {
appendTYPE(summary, OpenMetricsType.summary);
printMedian(percentileValues, summary, tags, metadata);
}
} else {
appendTYPE(summary, OpenMetricsType.summary);
printMedian(percentileValues, summary, tags, metadata);
}
appendValue(globalName(metricID, metadata, "_count"), tags, ((double) count.getAsLong()));
appendValue(globalName(metricID, metadata, "_sum"), tags, (sum.get()).doubleValue());
}
public void printCustomPercentile(Snapshot.PercentileValue[] pencentileValues, String summary, Tag[] tags, Metadata metadata) {
for (Snapshot.PercentileValue value : pencentileValues) {
appendValue(summary, tags("quantile", Double.toString(value.getPercentile()), tags), value.getValue());
}
}
public void printBuckets(Snapshot.HistogramBucket[] buckets, String summary, Tag[] tags, Metadata metadata,
Sampling sampling, LongSupplier count) {
if (sampling != null && sampling instanceof HistogramImpl) {
for (Snapshot.HistogramBucket b : buckets) {
appendValue(summary, tags("le", Double.toString(b.getBucket()), tags), ((double) evaluateBucketCount(b.getBucket(), sampling)));
}
} else {
List bucketsList = Stream.of(buckets)
.map(bucket -> TimeUnit.MILLISECONDS.convert((long) bucket.getBucket(), TimeUnit.NANOSECONDS))
.collect(Collectors.toList());
for (long b : bucketsList) {
double seconds = b / 1000.0;
appendValue(summary, tags("le", Double.toString(seconds), tags), ((double) evaluateBucketCount(seconds, sampling)));
}
}
appendValue(summary, tags("le", "+Inf", tags), ((double) count.getAsLong()));
}
public long evaluateBucketCount(double bucket, Sampling sampling) {
Snapshot snapshot = sampling.getSnapshot();
if (snapshot instanceof WeightedSnapshot) {
WeightedSnapshot weightedSnapshot = (WeightedSnapshot) snapshot;
double[] conversionArray = null;
long[] values = weightedSnapshot.getValues();
if (sampling instanceof TimerImpl) {
conversionArray = Arrays.stream(values).mapToDouble(l -> l / 1000000000D).toArray();
} else {
conversionArray = Arrays.stream(values).mapToDouble(l -> Long.valueOf(l).doubleValue()).toArray();
}
return Arrays.stream(conversionArray).filter(s -> s <= bucket).count();
}
return 0L;
}
public void printMedian(Snapshot.PercentileValue[] pencentileValues, String summary, Tag[] tags, Metadata metadata) {
Optional median = Arrays.stream(pencentileValues)
.filter(p -> p.getPercentile() == 0.5).findFirst();
Optional percentile75th = Arrays.stream(pencentileValues)
.filter(p -> p.getPercentile() == 0.75).findFirst();
Optional percentile95th = Arrays.stream(pencentileValues)
.filter(p -> p.getPercentile() == 0.95).findFirst();
Optional percentile98th = Arrays.stream(pencentileValues)
.filter(p -> p.getPercentile() == 0.98).findFirst();
Optional percentile99th = Arrays.stream(pencentileValues)
.filter(p -> p.getPercentile() == 0.99).findFirst();
Optional percentile999th = Arrays.stream(pencentileValues)
.filter(p -> p.getPercentile() == 0.999).findFirst();
if(median.isPresent()) {
appendValue(summary, tags("quantile", "0.5", tags),
scaleToBaseUnit(median.get().getValue(), metadata));
}
if(percentile75th.isPresent()) {
appendValue(summary, tags("quantile", "0.75", tags),
scaleToBaseUnit(percentile75th.get().getValue(), metadata));
}
if(percentile95th.isPresent()) {
appendValue(summary, tags("quantile", "0.95", tags),
scaleToBaseUnit(percentile95th.get().getValue(), metadata));
}
if(percentile98th.isPresent()) {
appendValue(summary, tags("quantile", "0.98", tags),
scaleToBaseUnit(percentile98th.get().getValue(), metadata));
}
if(percentile99th.isPresent()) {
appendValue(summary, tags("quantile", "0.99", tags),
scaleToBaseUnit(percentile99th.get().getValue(), metadata));
}
if(percentile999th.isPresent()) {
appendValue(summary, tags("quantile", "0.999", tags),
scaleToBaseUnit(percentile999th.get().getValue(), metadata));
}
}
@Override
public void export(MetricID metricID, Timer timer, Metadata metadata) {
exportSampling(metricID, timer, timer::getCount, () -> toSeconds(timer.getElapsedTime()), metadata);
}
protected void appendTYPE(String globalName, OpenMetricsType type) {
if (!typeWrittenByGlobalName.add(globalName)) {
// write metadata only once per metric
return;
}
out.append("# TYPE ").append(globalName).append(' ').append(type.name()).append('\n');
}
protected void appendHELP(String globalName, Metadata metadata) {
if (!helpWrittenByGlobalName.add(globalName)) {
// write metadata only once per metric
return;
}
Optional description = metadata.description();
out.append("# HELP ").append(globalName).append(' ').append(description.isPresent() ? description.get(): "").append('\n');
}
protected void appendValue(String globalName, Tag[] tags, Number value) {
out.append(globalName);
out.append(tagsToString(tags));
if(globalName.equals(GC_TOTAL_ID) || globalName.equals(GC_TIME_SECONDS_TOTAL_ID)) {
out.append(' ').append(value.toString()).append('\n');
} else {
out.append(' ').append(value == null ? "NaN" : roundValue(value)).append('\n');
}
}
private void appendValue(String globalName, Tag[] tags, long value) {
appendValue(globalName, tags, Long.valueOf(value));
}
private void appendValue(String globalName, Tag[] tags, double value) {
appendValue(globalName, tags, Double.valueOf(value));
}
protected String roundValue(Number value) {
String valString = value.toString();
if (valString.endsWith("000000001")) {
valString = valString.substring(0, valString.length() - 9); // cut off double representation error
}
if (valString.contains("000000001E")) {
valString = valString.replace("000000001E", "E"); // cut off double representation error for exponential form
}
return valString;
}
protected static String tagsToString(Tag[] tags) {
if (tags.length == 0) {
return "";
}
String result = "";
result += "{";
for (int i = 0; i < tags.length; i++) {
if (i > 0) {
result += ",";
}
result += sanitizeMetricName(tags[i].getTagName())
+ "=\""
+ escapeTagValue(tags[i].getTagValue())
+ '"';
}
result += "}";
return result;
}
private String globalName(MetricID metricID, Metadata unit) {
return globalName(metricID, "", unit, "");
}
private String globalName(MetricID metricID, String infix, Metadata unit) {
return globalName(metricID, infix, unit, "");
}
private String globalName(MetricID metricID, Metadata unit, String suffix) {
return globalName(metricID, "", unit, suffix);
}
private String globalName(MetricID metricID, String infix, Metadata metadata, String suffix) {
if (!metadata.unit().isPresent()) {
return globalName(metricID, infix + suffix);
}
String unit = metadata.getUnit();
switch (unit) {
case MetricUnits.NANOSECONDS:
case MetricUnits.MICROSECONDS:
case MetricUnits.MILLISECONDS:
case MetricUnits.SECONDS:
case MetricUnits.MINUTES:
case MetricUnits.HOURS:
case MetricUnits.DAYS:
return globalName(metricID, infix + "_seconds" + suffix);
case MetricUnits.BITS:
case MetricUnits.BYTES:
case MetricUnits.KILOBITS:
case MetricUnits.MEGABITS:
case MetricUnits.GIGABITS:
case MetricUnits.MEBIBITS:
case MetricUnits.GIBIBITS:
case MetricUnits.KILOBYTES:
case MetricUnits.MEGABYTES:
return globalName(metricID, infix + "_bytes" + suffix);
case MetricUnits.PERCENT:
return globalName(metricID, infix + "_ratio" + suffix);
case MetricUnits.PER_SECOND:
return globalName(metricID, infix + "_per_second" + suffix);
case MetricUnits.NONE:
return globalName(metricID, infix + suffix);
case MetricUnits.KIBIBITS:
case MetricUnits.GIGABYTES:
default:
return globalName(metricID, infix + "_" + unit + suffix);
}
}
private String globalName(MetricID metricID, String suffix) {
String name = metricID.getName();
return sanitizeMetricName(!suffix.isEmpty() && (name.endsWith(suffix) || name.contains(".total"))
? name
: name + suffix);
}
private static CharSequence escapeTagValue(String name) {
StringBuilder str = new StringBuilder(name.length());
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
if (c == '\n') {
str.append("\\n");
} else {
if (c == '\\' || c == '"') {
str.append('\\');
}
str.append(c);
}
}
return str;
}
public static String sanitizeMetricName(String name) {
//Translation rules :
//All characters not in the range a-z A-Z or 0-9 are translated to underscore (_)
//Double underscore is translated to single underscore
String out = name.replaceAll("[^a-zA-Z0-9_]+", "_");
//Colon-underscore (:_) is translated to single colon
return out.replaceAll(":_", ":");
}
private static Tag[] tags(String name, String value, Tag[] rest) {
Tag tag = new Tag(name, value);
if (rest.length == 0) {
return new Tag[] { tag };
}
Tag[] res = Arrays.copyOf(rest, rest.length + 1);
res[rest.length] = tag;
return res;
}
private static final BigDecimal NANOS_IN_SECOND = BigDecimal.valueOf(1000000000L);
private static Number toSeconds(Duration d) {
if (d == null) {
return null;
}
if (d.getNano() == 0) {
return d.getSeconds() / 1000d;
}
BigDecimal nanos = BigDecimal.valueOf(d.getSeconds()).multiply(NANOS_IN_SECOND).add(BigDecimal.valueOf(d.getNano()));
return nanos.divide(NANOS_IN_SECOND).doubleValue();
}
}
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