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Embedded-Web Distribution of the Payara Project
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) [2017-2022] 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/master/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
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
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*/
package fish.payara.microprofile.healthcheck;
import com.sun.enterprise.web.WebApplication;
import com.sun.enterprise.web.WebComponentInvocation;
import com.sun.enterprise.web.WebContainer;
import static fish.payara.microprofile.healthcheck.HealthCheckType.LIVENESS;
import static fish.payara.microprofile.healthcheck.HealthCheckType.READINESS;
import static fish.payara.microprofile.healthcheck.HealthCheckType.STARTUP;
import static java.util.Collections.emptyList;
import static java.util.Collections.singletonMap;
import static java.util.logging.Level.WARNING;
import static java.util.stream.Collectors.joining;
import java.beans.PropertyChangeEvent;
import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiConsumer;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import jakarta.annotation.PostConstruct;
import jakarta.inject.Inject;
import jakarta.json.Json;
import jakarta.json.JsonArrayBuilder;
import jakarta.json.JsonObjectBuilder;
import jakarta.json.JsonWriter;
import jakarta.json.JsonWriterFactory;
import jakarta.json.stream.JsonGenerator;
import jakarta.servlet.http.HttpServletResponse;
import org.eclipse.microprofile.health.HealthCheck;
import org.eclipse.microprofile.health.HealthCheckResponse;
import org.eclipse.microprofile.health.HealthCheckResponse.Status;
import org.glassfish.api.StartupRunLevel;
import org.glassfish.api.event.EventListener;
import org.glassfish.api.event.Events;
import org.glassfish.hk2.runlevel.RunLevel;
import org.glassfish.internal.api.Globals;
import org.glassfish.internal.data.ApplicationRegistry;
import org.glassfish.internal.deployment.Deployment;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.ConfigListener;
import org.jvnet.hk2.config.UnprocessedChangeEvent;
import org.jvnet.hk2.config.UnprocessedChangeEvents;
import fish.payara.microprofile.healthcheck.checks.PayaraHealthCheck;
import fish.payara.microprofile.healthcheck.config.MicroprofileHealthCheckConfiguration;
import fish.payara.monitoring.collect.MonitoringData;
import fish.payara.monitoring.collect.MonitoringDataCollector;
import fish.payara.monitoring.collect.MonitoringDataSource;
import fish.payara.monitoring.collect.MonitoringWatchCollector;
import fish.payara.monitoring.collect.MonitoringWatchSource;
import fish.payara.nucleus.healthcheck.configuration.Checker;
import fish.payara.nucleus.healthcheck.events.PayaraHealthCheckServiceEvents;
import java.util.Optional;
import org.glassfish.api.invocation.InvocationException;
import org.glassfish.api.invocation.InvocationManager;
import org.glassfish.internal.data.ApplicationInfo;
/**
* Service that handles the registration, execution, and response of MicroProfile HealthChecks.
*
* @author Andrew Pielage
*/
@Service(name = "healthcheck-service")
@RunLevel(StartupRunLevel.VAL)
public class HealthCheckService implements EventListener, ConfigListener, MonitoringDataSource, MonitoringWatchSource {
@Inject
private Events events;
@Inject
private ApplicationRegistry applicationRegistry;
@Inject
private InvocationManager invocationManager;
@Inject
private MicroprofileHealthCheckConfiguration configuration;
private static final Logger LOG = Logger.getLogger(HealthCheckService.class.getName());
private final Map> readiness = new ConcurrentHashMap<>();
private final Map> liveness = new ConcurrentHashMap<>();
private final Map> startup = new ConcurrentHashMap<>();
private final Map applicationClassLoaders = new ConcurrentHashMap<>();
private final List applicationsLoaded = new CopyOnWriteArrayList<>();
private final AtomicReference>> checksCollected = new AtomicReference<>();
@PostConstruct
public void postConstruct() {
if (events == null) {
events = Globals.getDefaultBaseServiceLocator().getService(Events.class);
}
events.register(this);
}
@Override
@MonitoringData(ns = "health", intervalSeconds = 12)
public void collect(MonitoringDataCollector collector) {
Map> collected = new HashMap<>();
Map> readinessResponsesByAppName = collectChecks(collector, readiness, collected);
Map> livenessResponsesByAppName = collectChecks(collector, liveness, collected);
Map> startupResponsesByAppName = collectChecks(collector, startup, collected);
checksCollected.set(collected);
if (!collected.isEmpty()) {
List overall = new ArrayList<>();
overall.addAll(collectJointType(collector, "Readiness", readinessResponsesByAppName));
overall.addAll(collectJointType(collector, "Liveness", livenessResponsesByAppName));
overall.addAll(collectJointType(collector, "Startup", startupResponsesByAppName));
collectUpDown(collector, computeJointState("Overall", overall));
}
for (String appName : collected.keySet()) {
List overallByApp = new ArrayList<>();
overallByApp.addAll(readinessResponsesByAppName.getOrDefault(appName, emptyList()));
overallByApp.addAll(livenessResponsesByAppName.getOrDefault(appName, emptyList()));
overallByApp.addAll(startupResponsesByAppName.getOrDefault(appName, emptyList()));
collectUpDown(collector.group(appName), computeJointState("Overall", overallByApp));
}
}
private static void collectUpDown(MonitoringDataCollector collector, HealthCheckResponse response) {
collector.collect(response.getName(), response.getStatus() == Status.UP ? 1 : 0);
}
private static List collectJointType(MonitoringDataCollector collector, String type,
Map> healthResponsesByAppName) {
List allForType = new ArrayList<>();
for (Entry> e : healthResponsesByAppName.entrySet()) {
HealthCheckResponse joint = computeJointState(type, e.getValue());
collectUpDown(collector.group(e.getKey()), joint);
allForType.addAll(e.getValue());
}
collectUpDown(collector, computeJointState(type, allForType));
return allForType;
}
@Override
public void collect(MonitoringWatchCollector collector) {
Map> collected = checksCollected.get();
if (collected != null) {
for (Entry> e : collected.entrySet()) {
String appName = e.getKey();
for (String metric : e.getValue()) {
addWatch(collector, appName, metric);
}
addWatch(collector, appName, "Readiness");
addWatch(collector, appName, "Liveness");
addWatch(collector, appName, "Startup");
addWatch(collector, appName, "Health");
}
if (!collected.isEmpty()) {
addWatch(collector, null, "Readiness");
addWatch(collector, null, "Liveness");
addWatch(collector, null, "Startup");
addWatch(collector, null, "Health");
}
}
}
private static void addWatch(MonitoringWatchCollector collector, String appName, String metric) {
String series = appName == null ? "ns:health " + metric : "ns:health @:" + appName + " " + metric;
String watchName = "RAG "+ metric + (appName == null ? "" : " @" + appName);
collector.watch(series, watchName, "updown")
.red(-1L, 5, false, null, 1, false)
.amber(-1L, 1, false, null, 1, false)
.green(1L, 1, false, null, 1, false);
}
private Map> collectChecks(MonitoringDataCollector collector,
Map> checks, Map> collected) {
Map> statusByApp = new HashMap<>();
for (Entry> entry : checks.entrySet()) {
String appName = entry.getKey();
MonitoringDataCollector appCollector = collector.group(appName);
for (HealthCheck check : entry.getValue()) {
HealthCheckResponse response = performHealthCheckInApplicationContext(appName, check);
String metric = response.getName();
Set appCollected = collected.get(appName);
// prevent adding same check more then once, unfortunately we have to run it to find that out
if (appCollected == null || !appCollected.contains(metric)) {
statusByApp.computeIfAbsent(appName, key -> new ArrayList<>()).add(response);
collectUpDown(appCollector, response);
if (response.getStatus() == Status.DOWN && response.getData().isPresent()) {
appCollector.annotate(metric, 0L, createAnnotation(response.getData().get()));
}
collected.computeIfAbsent(appName, key -> new HashSet<>()).add(metric);
}
}
}
return statusByApp;
}
private static HealthCheckResponse computeJointState(String name, Collection responses) {
long ups = responses.stream().filter(response -> response.getStatus() == Status.UP).count();
if (ups == responses.size()) {
return HealthCheckResponse.up(name);
}
String upNames = responses.stream()
.filter(r -> r.getStatus() == Status.UP)
.map(r -> r.getName())
.collect(joining(","));
String downNames = responses.stream()
.filter(r -> r.getStatus() == Status.DOWN)
.map(r -> r.getName())
.collect(joining(","));
return HealthCheckResponse.named(name).down()
.withData("up", upNames)
.withData("down", downNames)
.build();
}
private static String[] createAnnotation(Map data) {
List attrs = new ArrayList<>();
for (Entry e : data.entrySet()) {
Object value = e.getValue();
if (value instanceof String || value instanceof Number || value instanceof Boolean) {
attrs.add(e.getKey());
attrs.add(value.toString());
}
}
return attrs.toArray(new String[0]);
}
@Override
public void event(Event event) {
// Remove healthchecks when the app is undeployed.
Deployment.APPLICATION_UNLOADED.onMatch(event, appInfo -> unregisterHealthCheck(appInfo.getName()));
// Keep track of all deployed applications.
Deployment.APPLICATION_STARTED.onMatch(event, appInfo -> applicationsLoaded.add(appInfo.getName()));
PayaraHealthCheckServiceEvents.HEALTHCHECK_SERVICE_CHECKER_ADD_TO_MICROPROFILE_HEALTH.onMatch(event, healthChecker
-> registerHealthCheck(healthChecker.getName(),
new PayaraHealthCheck(healthChecker.getName(), healthChecker.getCheck()), READINESS));
PayaraHealthCheckServiceEvents.HEALTHCHECK_SERVICE_CHECKER_REMOVE_FROM_MICROPROFILE_HEALTH.onMatch(event, healthChecker
-> unregisterHealthCheck(healthChecker.getName()));
if (event.is(PayaraHealthCheckServiceEvents.HEALTHCHECK_SERVICE_DISABLED)) {
for (Checker checker : getHealthCheckerList()) {
if (Boolean.valueOf(checker.getAddToMicroProfileHealth())) {
unregisterHealthCheck(checker.getName());
}
}
}
}
private List getHealthCheckerList() {
fish.payara.nucleus.healthcheck.HealthCheckService payaraHealthCheckService
= Globals.getDefaultBaseServiceLocator().getService(fish.payara.nucleus.healthcheck.HealthCheckService.class);
return payaraHealthCheckService.getConfiguration().getCheckerList();
}
public boolean isEnabled() {
return Boolean.parseBoolean(configuration.getEnabled());
}
public boolean isSecurityEnabled() {
return Boolean.parseBoolean(configuration.getSecurityEnabled());
}
/**
* Register a HealthCheck to the Set of HealthChecks to execute when
* performHealthChecks is called.
*
* @param healthCheckName The name of the HealthCheck
* @param healthCheck The HealthCheck to register
*/
public void registerHealthCheck(String healthCheckName, HealthCheck healthCheck, HealthCheckType type) {
Map> healthChecks = getHealthChecks(type);
// If we don't already have the app registered, we need to create a new Set for it
if (!healthChecks.containsKey(healthCheckName)) {
// Sync so that we don't get clashes
synchronized (this) {
// Check again so that we don't overwrite
if (!healthChecks.containsKey(healthCheckName)) {
// Create a new Map entry and set for the Healthchecks.
healthChecks.put(healthCheckName, ConcurrentHashMap.newKeySet());
}
}
}
// Add the healthcheck to the Set in the Map
healthChecks.get(healthCheckName).add(healthCheck);
}
public void unregisterHealthCheck(String appName) {
readiness.remove(appName);
liveness.remove(appName);
startup.remove(appName);
applicationClassLoaders.remove(appName);
applicationsLoaded.remove(appName);
}
/**
* Register a ClassLoader for an application.
*
* @param appName The name of the application being deployed
* @param classloader
*/
public void registerClassLoader(String appName, ClassLoader classloader) {
// If we don't already have the app registered, we need to create a new Set for it
if (!applicationClassLoaders.containsKey(appName)) {
// Sync so that we don't get clashes
synchronized (this) {
// Check again so that we don't overwrite
if (!applicationClassLoaders.containsKey(appName)) {
// Create a new Map entry and set for the Healthchecks.
applicationClassLoaders.put(appName, classloader);
}
}
}
}
private Map> getHealthChecks(HealthCheckType type) {
if (type == null) {
type = HealthCheckType.UNKNOWN;
}
switch (type) {
case LIVENESS:
return liveness;
case READINESS:
return readiness;
case STARTUP:
return startup;
case UNKNOWN:
default:
LOG.warning("Unrecognised HealthCheckType: " + type);
return new HashMap<>();
}
}
private Map> getCollectiveHealthChecks(HealthCheckType type) {
final Map> healthChecks;
if (type == READINESS) {
healthChecks = readiness;
} else if (type == LIVENESS) {
healthChecks = liveness;
} else if (type == STARTUP) {
healthChecks = startup;
} else {
// Make sure we do a deep-copy first, otherwise the first map the foreach consumer gets used on will be a
// shallow copy: the two maps will essentially be the same map (changes to one affecting the other)
healthChecks = readiness.entrySet().stream().collect(Collectors.toMap(entry ->
entry.getKey(), entry -> new HashSet(entry.getValue())));
BiConsumer> mergeHealthCheckMap
= (key, value) -> healthChecks.merge(key, value, (oldValue, newValue) -> {
oldValue.addAll(newValue);
return oldValue;
});
liveness.forEach(mergeHealthCheckMap);
startup.forEach(mergeHealthCheckMap);
}
return healthChecks;
}
/**
* Execute the call method of every registered HealthCheck and generate the response.
*
* @param response The response to return
* @param type the type of health check
* @throws IOException If there's an issue writing the response
*/
public void performHealthChecks(HttpServletResponse response, HealthCheckType type, String enablePrettyPrint) throws IOException {
Set healthCheckResponses = new HashSet<>();
// Iterate over every HealthCheck stored in the Map
for (Entry> healthChecksEntry : getCollectiveHealthChecks(type).entrySet()) {
for (HealthCheck healthCheck : healthChecksEntry.getValue()) {
// Execute the call method of the HealthCheck and add its outcome to the set of responses
try {
healthCheckResponses.add(healthCheck.call());
} catch (IllegalStateException ise) {
// If WebComponentInvocation is not present, the app is not ready eg. mid-deployment and the
// HealthCheck call should not be made.
ApplicationInfo appInfo = applicationRegistry.get(healthChecksEntry.getKey());
if (createWebComponentInvocation(appInfo).isPresent()) {
healthCheckResponses.add(performHealthCheckInApplicationContext(healthChecksEntry.getKey(), healthCheck));
}
} catch (Exception ex) {
LOG.log(WARNING, "Exception executing HealthCheck : " + healthCheck.getClass().getCanonicalName(), ex);
// If there's any issue, set the response to an error
response.setStatus(500);
}
}
}
// No applications (yet), server is not ready.
if (applicationsLoaded.isEmpty()) {
// Application is not yet deployed
healthCheckResponses.add(
HealthCheckResponse.builder()
.name("No Application deployed")
.down()
.build()
);
}
// If we haven't encountered an exception, construct the JSON response
if (response.getStatus() != 500) {
constructResponse(response, healthCheckResponses, type, enablePrettyPrint);
}
}
private HealthCheckResponse performHealthCheckInApplicationContext(
String appName, HealthCheck healthCheck) {
Thread currentThread = Thread.currentThread();
ClassLoader originalClassLoader = currentThread.getContextClassLoader();
Optional wciOpt = Optional.empty();
try {
ApplicationInfo appInfo = applicationRegistry.get(appName);
currentThread.setContextClassLoader(appInfo.getAppClassLoader());
wciOpt = createWebComponentInvocation(appInfo);
wciOpt.ifPresent(wci -> invocationManager.preInvoke(wci));
return healthCheck.call();
} finally {
wciOpt.ifPresent(wci -> invocationManager.postInvoke(wci));
currentThread.setContextClassLoader(originalClassLoader);
}
}
private Optional createWebComponentInvocation(ApplicationInfo appInfo) throws InvocationException {
return appInfo.getModuleInfos().stream()
.map(mi -> mi.getEngineRefForContainer(WebContainer.class))
.filter(engineRef -> engineRef != null)
.flatMap(engineRef -> ((WebApplication) engineRef.getApplicationContainer()).getWebModules().stream())
.findFirst()
.map(wm -> new WebComponentInvocation(wm));
}
private void constructResponse(HttpServletResponse httpResponse,
Set healthCheckResponses,
HealthCheckType type, String enablePrettyPrint) throws IOException {
httpResponse.setContentType("application/json");
// For each HealthCheckResponse we got from executing the health checks...
JsonArrayBuilder checksArray = Json.createArrayBuilder();
for (HealthCheckResponse healthCheckResponse : healthCheckResponses) {
JsonObjectBuilder healthCheckObject = Json.createObjectBuilder();
// Add the name and status
healthCheckObject.add("name", healthCheckResponse.getName());
healthCheckObject.add("status", healthCheckResponse.getStatus().toString());
// Add data if present
JsonObjectBuilder healthCheckData = Json.createObjectBuilder();
if (healthCheckResponse.getData().isPresent() && !healthCheckResponse.getData().get().isEmpty()) {
for (Map.Entry dataMapEntry : healthCheckResponse.getData().get().entrySet()) {
healthCheckData.add(dataMapEntry.getKey(), dataMapEntry.getValue().toString());
}
}
healthCheckObject.add("data", healthCheckData);
// Add finished Object to checks array
checksArray.add(healthCheckObject);
// Check if we need to set the response as 503. Check against status 200 so we don't repeatedly set it
if (httpResponse.getStatus() == 200
&& healthCheckResponse.getStatus().equals(HealthCheckResponse.Status.DOWN)) {
httpResponse.setStatus(503);
}
}
// Create the final aggregate object
JsonObjectBuilder responseObject = Json.createObjectBuilder();
// Set the aggregate status
responseObject.add("status", httpResponse.getStatus() == 200 ? "UP" : "DOWN");
// Add all of the checks
responseObject.add("checks", checksArray);
String prettyPrinting = enablePrettyPrint == null || enablePrettyPrint.equals("false") ? "" : JsonGenerator.PRETTY_PRINTING;
JsonWriterFactory jsonWriterFactory = Json.createWriterFactory(singletonMap(prettyPrinting, ""));
StringWriter stringWriter = new StringWriter();
try (JsonWriter jsonWriter = jsonWriterFactory.createWriter(stringWriter)) {
jsonWriter.writeObject(responseObject.build());
}
// Print the outcome
httpResponse.getOutputStream().print(stringWriter.toString());
}
@Override
public UnprocessedChangeEvents changed(PropertyChangeEvent[] events) {
List unchangedList = new ArrayList<>();
for (PropertyChangeEvent event : events) {
unchangedList.add(new UnprocessedChangeEvent(event, "Microprofile HealthCheck configuration changed:" + event.getPropertyName()
+ " was changed from " + event.getOldValue().toString() + " to " + event.getNewValue().toString()));
}
return new UnprocessedChangeEvents(unchangedList);
}
}