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FlightRecorderHelper.java
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FlightRecorderHelper.java
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/*
* Copyright The Cryostat Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.cryostat.agent;
import java.io.IOException;
import java.io.StringReader;
import java.text.ParseException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import jdk.jfr.Configuration;
import jdk.jfr.FlightRecorder;
import jdk.jfr.Recording;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FlightRecorderHelper {
private final Logger log = LoggerFactory.getLogger(getClass());
public Optional<Recording> createSnapshot() {
Recording snapshot = FlightRecorder.getFlightRecorder().takeSnapshot();
if (snapshot.getSize() == 0) {
log.warn("No active recordings");
snapshot.close();
return Optional.empty();
}
return Optional.of(snapshot);
}
public Recording createRecordingWithCustomTemplate(String template)
throws IOException, ParseException {
Recording recording = new Recording(Configuration.create(new StringReader(template)));
recording.setToDisk(true);
return recording;
}
public Optional<TemplatedRecording> createRecordingWithPredefinedTemplate(
String templateNameOrLabel) {
if ("ALL".equals(templateNameOrLabel)) {
Map<String, String> allTemplate = new HashMap<>();
FlightRecorder.getFlightRecorder()
.getEventTypes()
.forEach(
e -> {
e.getSettingDescriptors()
.forEach(
s -> {
allTemplate.put(
e.getName() + "#" + s.getName(),
s.getDefaultValue());
});
allTemplate.put(e.getName() + "#enabled", "true");
});
Recording recording = new Recording(allTemplate);
recording.setToDisk(true);
return Optional.of(
new TemplatedRecording(
new ConfigurationInfo(TemplateType.TARGET, "ALL", "ALL"), recording));
} else {
Optional<Configuration> opt = getTemplate(templateNameOrLabel);
if (opt.isEmpty()) {
log.error(
"Cannot start recording with template named or labelled {}",
templateNameOrLabel);
return Optional.empty();
}
Configuration configuration = opt.get();
Recording recording = new Recording(configuration.getSettings());
recording.setToDisk(true);
return Optional.of(
new TemplatedRecording(new ConfigurationInfo(configuration), recording));
}
}
public Optional<Configuration> getTemplate(String nameOrLabel) {
Objects.requireNonNull(nameOrLabel);
return Configuration.getConfigurations().stream()
.filter(c -> c.getName().equals(nameOrLabel) || c.getLabel().equals(nameOrLabel))
.findFirst();
}
public boolean isValidTemplate(String nameOrLabel) {
Objects.requireNonNull(nameOrLabel);
return getTemplate(nameOrLabel).isPresent();
}
public List<Recording> getRecordings() {
return getRecordings(r -> true);
}
public List<Recording> getRecordings(Predicate<Recording> predicate) {
if (!FlightRecorder.isAvailable()) {
log.error("FlightRecorder is unavailable");
return List.of();
}
return FlightRecorder.getFlightRecorder().getRecordings().stream()
.filter(predicate)
.collect(Collectors.toList());
}
public Optional<Recording> getRecording(long id) {
return getRecordings(r -> r.getId() == id).stream().findFirst();
}
@SuppressFBWarnings(value = {"EI_EXPOSE_REP", "EI_EXPOSE_REP2"})
public static class TemplatedRecording {
private final ConfigurationInfo configuration;
private final Recording recording;
public TemplatedRecording(ConfigurationInfo configuration, Recording recording) {
this.configuration = Objects.requireNonNull(configuration);
this.recording = Objects.requireNonNull(recording);
}
public ConfigurationInfo getConfigurationInfo() {
return configuration;
}
public Recording getRecording() {
return recording;
}
}
public static class ConfigurationInfo {
private final String name;
private final String label;
private final TemplateType type;
public ConfigurationInfo(TemplateType type, String name, String label) {
this.type = Objects.requireNonNull(type);
this.name = Objects.requireNonNull(name);
this.label = Objects.requireNonNull(label);
}
public ConfigurationInfo(Configuration configuration) {
this(TemplateType.TARGET, configuration.getName(), configuration.getLabel());
}
public String getName() {
return name;
}
public String getLabel() {
return label;
}
public TemplateType getType() {
return type;
}
}
public enum TemplateType {
TARGET,
CUSTOM,
;
}
@SuppressFBWarnings(value = "URF_UNREAD_FIELD")
public static class RecordingInfo {
public final long id;
public final String name;
public final String state;
public final Map<String, String> options;
public final long startTime;
public final long duration;
public final boolean isContinuous;
public final boolean toDisk;
public final long maxSize;
public final long maxAge;
RecordingInfo(Recording rec) {
this.id = rec.getId();
this.name = rec.getName();
this.state = rec.getState().name();
this.options = rec.getSettings();
if (rec.getStartTime() != null) {
this.startTime = rec.getStartTime().toEpochMilli();
} else {
this.startTime = 0;
}
this.isContinuous = rec.getDuration() == null;
this.duration = this.isContinuous ? 0 : rec.getDuration().toMillis();
this.toDisk = rec.isToDisk();
this.maxSize = rec.getMaxSize();
if (rec.getMaxAge() != null) {
this.maxAge = rec.getMaxAge().toMillis();
} else {
this.maxAge = 0;
}
}
}
}