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Client library for EJB applications working against Wildfly - Java EE Variant
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 org.jboss.ejb.client;
import static java.security.AccessController.doPrivileged;
import static org.jboss.ejb.client.EJBClientContext.EJB_SERVICE_TYPE;
import static org.jboss.ejb.client.EJBClientContext.FILTER_ATTR_CLUSTER;
import static org.jboss.ejb.client.EJBClientContext.FILTER_ATTR_EJB_MODULE;
import static org.jboss.ejb.client.EJBClientContext.FILTER_ATTR_EJB_MODULE_DISTINCT;
import static org.jboss.ejb.client.EJBClientContext.FILTER_ATTR_NODE;
import static org.jboss.ejb.client.EJBClientContext.FILTER_ATTR_SOURCE_IP;
import static org.jboss.ejb.client.EJBClientContext.withSuppressed;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.URI;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import jakarta.ejb.NoSuchEJBException;
import org.jboss.ejb._private.Keys;
import org.jboss.ejb._private.Logs;
import org.jboss.ejb.client.annotation.ClientInterceptorPriority;
import org.wildfly.common.Assert;
import org.wildfly.common.net.CidrAddress;
import org.wildfly.common.net.Inet;
import org.wildfly.discovery.AttributeValue;
import org.wildfly.discovery.Discovery;
import org.wildfly.discovery.FilterSpec;
import org.wildfly.discovery.ServiceURL;
import org.wildfly.discovery.ServicesQueue;
import org.wildfly.naming.client.NamingProvider;
import org.wildfly.security.auth.client.AuthenticationContext;
/**
* The Enterprise Beans client interceptor responsible for discovering the destination of a request. If a destination is already
* established, the interceptor passes the invocation through unmodified. If the interceptor cannot locate the
* destination, the invocation will proceed without a destination (and ultimately fail if no other interceptor
* resolves the destination).
*
* @author David M. Lloyd
*/
@ClientInterceptorPriority(DiscoveryEJBClientInterceptor.PRIORITY)
public final class DiscoveryEJBClientInterceptor implements EJBClientInterceptor {
private static final Supplier DISCOVERY_SUPPLIER = doPrivileged((PrivilegedAction>) Discovery.getContextManager()::getPrivilegedSupplier);
private static final String[] NO_STRINGS = new String[0];
private static final boolean WILDFLY_TESTSUITE_HACK = SecurityUtils.getBoolean(SystemProperties.WILDFLY_TESTSUITE_HACK);
// This provides a way timeout a discovery, avoiding blocking on some edge cases. See EJBCLIENT-311.
private static final long DISCOVERY_TIMEOUT = SecurityUtils.getLong(SystemProperties.DISCOVERY_TIMEOUT, 0L);
//how long to wait if at least one node has already been discovered. This one is in ms rather than s
private static final long DISCOVERY_ADDITIONAL_TIMEOUT = SecurityUtils.getLong(SystemProperties.DISCOVERY_ADDITIONAL_NODE_TIMEOUT, 200L);
/**
* This interceptor's priority.
*/
public static final int PRIORITY = ClientInterceptorPriority.JBOSS_AFTER + 100;
private static final AttachmentKey> BL_KEY = new AttachmentKey<>();
private static final Map blocklist = new ConcurrentHashMap<>();
private static final long BLOCKLIST_TIMEOUT = TimeUnit.MILLISECONDS.toNanos(SecurityUtils.getLong(SystemProperties.DISCOVERY_BLOCKLIST_TIMEOUT, 5000L));
/**
* Construct a new instance.
*/
public DiscoveryEJBClientInterceptor() {
}
public void handleInvocation(final EJBClientInvocationContext context) throws Exception {
if (context.getDestination() != null) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: calling handleInvocation - destination already discovered (destination = %s)", context.getDestination());
}
// already discovered!
context.sendRequest();
return;
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: calling handleInvocation - calling executeDiscovery");
}
List problems = executeDiscovery(context);
if(WILDFLY_TESTSUITE_HACK && context.getDestination() == null) {
Thread.sleep(2000);
problems = executeDiscovery(context);
}
try {
context.sendRequest();
} catch (NoSuchEJBException | RequestSendFailedException e) {
processMissingTarget(context, e);
throw e;
} finally {
if (problems != null) for (Throwable problem : problems) {
context.addSuppressed(problem);
}
}
}
public Object handleInvocationResult(final EJBClientInvocationContext context) throws Exception {
final Object result;
try {
result = context.getResult();
} catch (NoSuchEJBException | RequestSendFailedException e) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: handleInvocationResult: (exception = %s)", e.getMessage());
}
processMissingTarget(context, e);
throw e;
}
final EJBLocator locator = context.getLocator();
if (locator.isStateful() && locator.getAffinity() instanceof ClusterAffinity && context.getWeakAffinity() == Affinity.NONE) {
// set the weak affinity to the location of the session (in case it failed over)
final Affinity targetAffinity = context.getTargetAffinity();
if (targetAffinity != null) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: calling handleInvocationResult - stateful, clustered case, setting weakAffinity to targetAffinty = %s", targetAffinity);
}
context.setWeakAffinity(targetAffinity);
} else {
final URI destination = context.getDestination();
if (destination != null) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: calling handleInvocationResult - stateful, clustered case, setting weakAffinity to URIAffintiy = %s", URIAffinity.forUri(destination));
}
context.setWeakAffinity(URIAffinity.forUri(destination));
}
// if destination is null, then an interceptor set the location
}
}
return result;
}
public SessionID handleSessionCreation(final EJBSessionCreationInvocationContext context) throws Exception {
Logs.INVOCATION.tracef("DiscoveryEJBClientInterceptor: calling handleSessionCreation (locator = %s, weak affinity = %s)", context.getLocator(), context.getWeakAffinity());
if (context.getDestination() != null) {
// already discovered!
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: calling handleSessionCreation - destination already discovered (destination = %s)", context.getDestination());
}
return context.proceed();
}
List problems = executeDiscovery(context);
if(WILDFLY_TESTSUITE_HACK && context.getDestination() == null) {
Thread.sleep(2000);
problems = executeDiscovery(context);
}
SessionID sessionID;
try {
sessionID = context.proceed();
} catch (NoSuchEJBException | RequestSendFailedException e) {
processMissingTarget(context, e);
throw withSuppressed(e, problems);
} catch (Exception t) {
throw withSuppressed(t, problems);
}
setupSessionAffinities(context);
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: session affinities have been setup (locator = %s, weak affinity = %s)", context.getLocator(), context.getWeakAffinity());
}
return sessionID;
}
/**
* Gets the value (in milliseconds) of discovery additional timeout,
* configured with system property {@code org.jboss.ejb.client.discovery.additional-node-timeout}.
*
* @return the value (in milliseconds) of discovery additional timeout
*/
public static long getDiscoveryAdditionalTimeout() {
return DISCOVERY_ADDITIONAL_TIMEOUT;
}
/**
* Intended to be called by interceptors which assign a new destination
* in response to a session creation request. It will assign a new
* affinity (or weak affinity if clustered) in the case that an affinity
* (weak affinity if clustered) has not yet been set
*
* @param context the invocation context.
*/
static void setupSessionAffinities(EJBSessionCreationInvocationContext context) {
final EJBLocator locator = context.getLocator();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: setting up session affinities for new session bean: (locator = %s, weak affinity = %s, targetAffinity = %s)", context.getLocator(), context.getWeakAffinity(), context.getTargetAffinity());
}
// since this only affects session creations, this could be used to handle non-clustered beans (strong=Node, weak=None)
if (locator.getAffinity() == Affinity.NONE) {
// physically relocate this EJB
final Affinity targetAffinity = context.getTargetAffinity();
if (targetAffinity != null) {
context.setLocator(locator.withNewAffinity(targetAffinity));
} else {
final URI destination = context.getDestination();
if (destination != null) {
context.setLocator(locator.withNewAffinity(URIAffinity.forUri(destination)));
}
// if destination is null, then an interceptor set the location
}
}
if (locator.getAffinity() instanceof ClusterAffinity && context.getWeakAffinity() == Affinity.NONE) {
// set the weak affinity to the location of the session!
final Affinity targetAffinity = context.getTargetAffinity();
if (targetAffinity != null) {
context.setWeakAffinity(targetAffinity);
} else {
final URI destination = context.getDestination();
if (destination != null) {
context.setWeakAffinity(URIAffinity.forUri(destination));
}
// if destination is null, then an interceptor set the location
}
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: set up session affinities for new session bean: (locator = %s, weak affinity = %s, targetAffinity = %s)", context.getLocator(), context.getWeakAffinity(), context.getTargetAffinity());
}
}
private void processMissingTarget(final AbstractInvocationContext context, final Exception cause) {
final URI destination = context.getDestination();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf(cause, "DiscoveryEJBClientInterceptor: invocation failed with the following exception");
}
if (destination == null || context.getTargetAffinity() == Affinity.LOCAL) {
// nothing we can/should do.
return;
}
// Oops, we got some wrong information!
if (shouldBlocklist(cause)) {
addBlocklistedDestination(destination);
} else {
addInvocationBlocklistedDestination(context, destination);
}
getDiscovery().processMissingTarget(destination, cause);
// clear the weak affinity so that cluster invocations can be re-targeted.
context.setWeakAffinity(Affinity.NONE);
context.setTargetAffinity(null);
context.setDestination(null);
context.requestRetry();
}
static boolean shouldBlocklist(Exception cause){
if ((cause instanceof RequestSendFailedException)
&& (cause.getCause()) instanceof ConnectException) {
return true;
}
return false;
}
static void addInvocationBlocklistedDestination(AbstractInvocationContext context, URI destination) {
Assert.checkNotNullParam("context", context);
if (destination != null) {
Set set = context.getAttachment(BL_KEY);
if (set == null) {
final Set appearing = context.putAttachmentIfAbsent(BL_KEY, set = new HashSet<>());
if (appearing != null) {
set = appearing;
}
}
set.add(destination);
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: blocklisting destination for this invocation (locator = %s, weak affinity = %s, missing target = %s)", context.getLocator(), context.getWeakAffinity(), destination);
}
}
}
static void addBlocklistedDestination(URI destination) {
if (destination != null) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: blocklisting destination %s", destination);
}
blocklist.put(destination, System.nanoTime());
}
}
static boolean isBlocklisted(AbstractInvocationContext context, URI destination) {
final Set invocationBlocklist = context.getAttachment(BL_KEY);
if (invocationBlocklist != null && invocationBlocklist.contains(destination)) {
return true;
}
// check if it is in the static blocklist
if (!blocklist.containsKey(destination)) {
return false;
}
// getBlocklist() will remove any blocklisted entries that are now > than BLOCKLIST_TIMEOUT
// to check if any blocklisted destinations are now available to be used
return getBlocklist().contains(destination);
}
static Set getBlocklist(){
blocklist.entrySet().removeIf(e ->
{
return (System.nanoTime() - e.getValue()) > BLOCKLIST_TIMEOUT;
});
return blocklist.keySet();
}
ServicesQueue discover(final AbstractInvocationContext invocationContext, FilterSpec filterSpec) {
AuthenticationContext authenticationContext = invocationContext.getAuthenticationContext();
return authenticationContext != null
? authenticationContext.runBiFunction(DiscoveryEJBClientInterceptor::discover, this, filterSpec)
: discover(filterSpec);
}
ServicesQueue discover(final FilterSpec filterSpec) {
return getDiscovery().discover(EJB_SERVICE_TYPE, filterSpec);
}
Discovery getDiscovery() {
return DISCOVERY_SUPPLIER.get();
}
private List executeDiscovery(AbstractInvocationContext context) {
assert context.getDestination() == null;
final EJBLocator locator = context.getLocator();
final Affinity affinity = locator.getAffinity();
final Affinity weakAffinity = context.getWeakAffinity();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: calling executeDiscovery(locator = %s, weak affinity = %s)", locator, weakAffinity);
}
FilterSpec filterSpec, fallbackFilterSpec;
if (affinity instanceof URIAffinity || affinity == Affinity.LOCAL) {
if (! isBlocklisted(context, affinity.getUri())) {
// Simple; just set a fixed destination
context.setDestination(affinity.getUri());
context.setTargetAffinity(affinity);
}
return null;
} else if (affinity == Affinity.NONE && weakAffinity instanceof URIAffinity) {
if (! isBlocklisted(context, weakAffinity.getUri())) {
context.setDestination(weakAffinity.getUri());
context.setTargetAffinity(weakAffinity);
}
return null;
} else if (affinity == Affinity.NONE && weakAffinity instanceof NodeAffinity) {
filterSpec = FilterSpec.all(
FilterSpec.equal(FILTER_ATTR_NODE, ((NodeAffinity) weakAffinity).getNodeName()),
// require that the module be deployed on the chosen node
getFilterSpec(locator.getIdentifier().getModuleIdentifier())
);
return doFirstMatchDiscovery(context, filterSpec, null);
} else if (affinity instanceof NodeAffinity) {
filterSpec = FilterSpec.all(
FilterSpec.equal(FILTER_ATTR_NODE, ((NodeAffinity) affinity).getNodeName()),
// require that the module be deployed on the chosen node
getFilterSpec(locator.getIdentifier().getModuleIdentifier())
);
return doFirstMatchDiscovery(context, filterSpec, null);
} else if (affinity instanceof ClusterAffinity) {
if (weakAffinity instanceof NodeAffinity) {
filterSpec = FilterSpec.all(
FilterSpec.equal(FILTER_ATTR_CLUSTER, ((ClusterAffinity) affinity).getClusterName()),
FilterSpec.equal(FILTER_ATTR_NODE, ((NodeAffinity) weakAffinity).getNodeName()),
// require that the module be deployed on the chosen node
getFilterSpec(locator.getIdentifier().getModuleIdentifier())
);
fallbackFilterSpec = FilterSpec.all(
FilterSpec.equal(FILTER_ATTR_CLUSTER, ((ClusterAffinity) affinity).getClusterName()),
FilterSpec.hasAttribute(FILTER_ATTR_NODE),
// require that the module be deployed on the chosen node
getFilterSpec(locator.getIdentifier().getModuleIdentifier())
);
return doFirstMatchDiscovery(context, filterSpec, fallbackFilterSpec);
} else if (weakAffinity instanceof URIAffinity || weakAffinity == Affinity.LOCAL) {
// try direct
context.setDestination(weakAffinity.getUri());
context.setTargetAffinity(weakAffinity);
return null;
} else {
// regular cluster discovery
filterSpec = FilterSpec.all(
FilterSpec.equal(FILTER_ATTR_CLUSTER, ((ClusterAffinity) affinity).getClusterName()),
// require that the module be deployed on the chosen node
getFilterSpec(locator.getIdentifier().getModuleIdentifier())
);
return doClusterDiscovery(context, filterSpec);
}
} else {
// no affinity in particular
assert affinity == Affinity.NONE;
// require that the module be deployed on the chosen node
filterSpec = getFilterSpec(locator.getIdentifier().getModuleIdentifier());
return doAnyDiscovery(context, filterSpec, locator);
}
}
private List doFirstMatchDiscovery(AbstractInvocationContext context, final FilterSpec filterSpec, final FilterSpec fallbackFilterSpec) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performing first-match discovery(locator = %s, weak affinity = %s, filter spec = %s)", context.getLocator(), context.getWeakAffinity(), filterSpec);
}
final List problems;
final Set blocklist = getBlocklist();
try (final ServicesQueue queue = discover(context, filterSpec)) {
ServiceURL serviceURL;
while ((serviceURL = queue.takeService(DISCOVERY_TIMEOUT, TimeUnit.SECONDS)) != null) {
final URI location = serviceURL.getLocationURI();
if (!blocklist.contains(location)) {
// Got a match! See if there's a node affinity to set for the invocation.
final AttributeValue nodeValue = serviceURL.getFirstAttributeValue(FILTER_ATTR_NODE);
if (nodeValue != null) {
context.setTargetAffinity(new NodeAffinity(nodeValue.toString()));
} else {
// just set the URI
context.setTargetAffinity(URIAffinity.forUri(location));
}
context.setDestination(location);
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed first-match discovery(target affinity = %s, destination = %s)", context.getTargetAffinity(), context.getDestination());
}
return queue.getProblems();
}
}
problems = queue.getProblems();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw Logs.MAIN.operationInterrupted();
}
// No good; fall back to cluster discovery.
if (fallbackFilterSpec != null) {
assert context.getLocator().getAffinity() instanceof ClusterAffinity;
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed first-match discovery, no match, falling back to cluster discovery");
}
return merge(problems, doClusterDiscovery(context, fallbackFilterSpec));
} else {
// no match!
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed first-match discovery, no match");
}
}
return problems;
}
private static List merge(List problems, List problems2) {
if (problems2.isEmpty()) {
return problems;
} else if (problems.isEmpty()) {
return problems2;
} else {
final ArrayList problems3 = new ArrayList<>(problems.size() + problems2.size());
problems3.addAll(problems);
problems3.addAll(problems2);
return problems3;
}
}
private List doAnyDiscovery(AbstractInvocationContext context, final FilterSpec filterSpec, final EJBLocator locator) {
Logs.INVOCATION.tracef("DiscoveryEJBClientInterceptor: performing any discovery(locator = %s, weak affinity = %s, filter spec = %s)", context.getLocator(), context.getWeakAffinity(), filterSpec);
final List problems;
// blocklist
final Set blocklist = getBlocklist();
final Map nodes = new HashMap<>();
final Map uris = new HashMap<>();
final Map> clusterAssociations = new HashMap<>();
int nodeless = 0;
long timeout = DISCOVERY_TIMEOUT * 1000;
try (final ServicesQueue queue = discover(context, filterSpec)) {
ServiceURL serviceURL;
while ((serviceURL = queue.takeService(timeout, TimeUnit.MILLISECONDS)) != null) {
final URI location = serviceURL.getLocationURI();
if (!blocklist.contains(location)) {
// Got a match! See if there's a node affinity to set for the invocation.
final AttributeValue nodeValue = serviceURL.getFirstAttributeValue(FILTER_ATTR_NODE);
if (nodeValue != null) {
if (nodes.remove(location, null)) {
nodeless--;
}
final String nodeName = nodeValue.toString();
nodes.put(location, nodeName);
// we want to prioritize local invocation
if(!uris.containsKey(nodeName) || location.equals(Affinity.LOCAL.getUri())) {
uris.put(nodeName, location);
}
} else {
// just set the URI but don't overwrite a separately-found node name
if (nodes.putIfAbsent(location, null) == null) {
nodeless++;
}
}
// Handle multiple cluster specifications per entry, and also multiple entries with
// cluster specifications that refer to the same URI. Currently multi-membership is
// represented in the latter form, however, handle the first form as well, just in
// case this changes in the future.
final List clusters = serviceURL.getAttributeValues(FILTER_ATTR_CLUSTER);
if (clusters != null) {
for (AttributeValue cluster : clusters) {
List list = clusterAssociations.putIfAbsent(location, Collections.singletonList(cluster.toString()));
if (list != null) {
if (!(list instanceof ArrayList)) {
list = new ArrayList<>(list);
clusterAssociations.put(location, list);
}
list.add(cluster.toString());
}
}
}
//one has already been discovered, we may want a shorter timeout for additional nodes
if (DISCOVERY_ADDITIONAL_TIMEOUT != 0) {
timeout = DISCOVERY_ADDITIONAL_TIMEOUT; //this one is actually in ms, you generally want it very short
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf(" DISCOVERY_ADDITIONAL_TIMEOUT = %s", timeout);
}
}
}
}
problems = queue.getProblems();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw Logs.MAIN.operationInterrupted();
}
if (nodes.isEmpty()) {
// no match
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed any discovery, no match");
}
return problems;
}
URI location;
String nodeName;
if (nodes.size() == 1) {
final Map.Entry entry = nodes.entrySet().iterator().next();
location = entry.getKey();
nodeName = entry.getValue();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed any discovery(target affinity(node) = %s, destination = %s)", nodeName, location);
}
} else if (nodeless == 0) {
// use the deployment node selector
DeploymentNodeSelector selector = context.getClientContext().getDeploymentNodeSelector();
nodeName = selector.selectNode(nodes.values().toArray(NO_STRINGS), locator.getAppName(), locator.getModuleName(), locator.getDistinctName());
if (nodeName == null) {
throw Logs.INVOCATION.selectorReturnedNull(selector);
}
location = uris.get(nodeName);
if (location == null) {
throw Logs.INVOCATION.selectorReturnedUnknownNode(selector, nodeName);
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed any discovery, nodes > 1, deployment selector used(target affinity(node) = %s, destination = %s)", nodeName, location);
}
} else {
// todo: configure on client context
DiscoveredURISelector selector = DiscoveredURISelector.RANDOM;
location = selector.selectNode(new ArrayList<>(nodes.keySet()), locator);
if (location == null) {
throw Logs.INVOCATION.selectorReturnedNull(selector);
}
nodeName = nodes.get(location);
if (nodeName == null) {
throw Logs.INVOCATION.selectorReturnedUnknownNode(selector, location.toString());
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed any discovery, nodes > 1, URI selector used(target affinity(node) = %s, destination = %s)", nodeName, location);
}
}
// TODO DeploymentNodeSelector should be enhanced to handle URIs that are members of more than one cluster
// Clients typically do not have an auth policy for nodes which are dynamically discovered
// from cluster topology info. Anytime such a node is selected, we must register the
// associated cluster with the invocation, so that an effective auth config can be
// determined. Randomly pick a cluster if there is more than one.
selectCluster(context, clusterAssociations, location);
context.setDestination(location);
if (nodeName != null) context.setTargetAffinity(new NodeAffinity(nodeName));
return problems;
}
private void selectCluster(AbstractInvocationContext context, Map> clusterAssociations, URI location) {
List associations = clusterAssociations.get(location);
String cluster = null;
if (associations != null) {
cluster = (associations.size() == 1) ? associations.get(0) :
associations.get(ThreadLocalRandom.current().nextInt(associations.size()));
}
if (cluster != null) {
context.setInitialCluster(cluster);
}
}
private List doClusterDiscovery(AbstractInvocationContext context, final FilterSpec filterSpec) {
Logs.INVOCATION.tracef("DiscoveryEJBClientInterceptor: performing cluster discovery(locator = %s, weak affinity = %s, filter spec = %s)", context.getLocator(), context.getWeakAffinity(), filterSpec);
Map nodes = new HashMap<>();
final EJBClientContext clientContext = context.getClientContext();
final List problems;
long timeout = DISCOVERY_TIMEOUT * 1000;
try (final ServicesQueue queue = discover(context, filterSpec)) {
ServiceURL serviceURL;
while ((serviceURL = queue.takeService(timeout, TimeUnit.MILLISECONDS)) != null) {
final URI location = serviceURL.getLocationURI();
if (!isBlocklisted(context, location)) {
final EJBReceiver transportProvider = clientContext.getTransportProvider(location.getScheme());
if (transportProvider != null && satisfiesSourceAddress(serviceURL, transportProvider)) {
final AttributeValue nodeNameValue = serviceURL.getFirstAttributeValue(FILTER_ATTR_NODE);
// should always be true, but no harm in checking
if (nodeNameValue != null) {
nodes.put(nodeNameValue.toString(), location);
if (DISCOVERY_ADDITIONAL_TIMEOUT != 0) {
timeout = DISCOVERY_ADDITIONAL_TIMEOUT;
}
}
}
}
}
problems = queue.getProblems();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw Logs.MAIN.operationInterrupted();
}
// Prefer nodes associated with a transaction, if possible
nodes = tryFilterToPreferredNodes(context, nodes);
final EJBLocator locator = context.getLocator();
if (nodes.isEmpty()) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed cluster discovery, nodes is empty; trying an initial ");
}
final NamingProvider namingProvider = context.getAttachment(Keys.NAMING_PROVIDER_ATTACHMENT_KEY);
if (namingProvider != null) {
NamingEJBClientInterceptor.setNamingDestination(context, namingProvider);
}
return problems;
} else if (nodes.size() == 1) {
// just one choice, use it
final Map.Entry entry = nodes.entrySet().iterator().next();
final String nodeName = entry.getKey();
final URI uri = entry.getValue();
context.setTargetAffinity(new NodeAffinity(nodeName));
context.setDestination(uri);
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed cluster discovery, single node case (target affinity = %s, destination = %s)", context.getTargetAffinity(), context.getDestination());
}
return problems;
}
// we have to run through the node selection process
ArrayList availableNodes = new ArrayList<>(nodes.size());
ArrayList connectedNodes = new ArrayList<>(nodes.size());
for (Map.Entry entry : nodes.entrySet()) {
final String nodeName = entry.getKey();
final URI uri = entry.getValue();
final EJBReceiver transportProvider = clientContext.getTransportProvider(uri.getScheme());
if (transportProvider != null) {
availableNodes.add(nodeName);
if (transportProvider.isConnected(uri)) {
connectedNodes.add(nodeName);
}
}
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performing cluster discovery, multi node case (connected nodes = %s, available nodes = %s)", connectedNodes, availableNodes);
}
final ClusterNodeSelector selector = clientContext.getClusterNodeSelector();
final String selectedNode = selector.selectNode(((ClusterAffinity) locator.getAffinity()).getClusterName(), connectedNodes.toArray(NO_STRINGS), availableNodes.toArray(NO_STRINGS));
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performing cluster discovery, multi-node case (cluster node selector = %s, selected node = %s)", selector.getClass().getName(), selectedNode);
}
if (selectedNode == null) {
throw withSuppressed(Logs.MAIN.selectorReturnedNull(selector), problems);
}
final URI uri = nodes.get(selectedNode);
if (uri == null) {
throw withSuppressed(Logs.MAIN.selectorReturnedUnknownNode(selector, selectedNode), problems);
}
// got it!
context.setDestination(uri);
context.setTargetAffinity(new NodeAffinity(selectedNode));
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("DiscoveryEJBClientInterceptor: performed cluster discovery (target affinity = %s, destination = %s)", context.getTargetAffinity(), context.getDestination());
}
return problems;
}
@SuppressWarnings("Java8CollectionRemoveIf")
private Map tryFilterToPreferredNodes(AbstractInvocationContext context, Map nodes) {
Collection attachment = context.getAttachment(TransactionInterceptor.PREFERRED_DESTINATIONS);
if (attachment == null) {
return nodes;
}
HashSet preferred = new HashSet<>(attachment);
Map result = null;
for (Map.Entry check : nodes.entrySet()) {
if (preferred.contains(check.getValue())) {
if (result == null) {
result = new HashMap<>(attachment.size());
}
result.put(check.getKey(), check.getValue());
}
}
return result == null ? nodes : result;
}
FilterSpec getFilterSpec(EJBModuleIdentifier identifier) {
final String appName = identifier.getAppName();
final String moduleName = identifier.getModuleName();
final String distinctName = identifier.getDistinctName();
if (distinctName != null && ! distinctName.isEmpty()) {
if (appName.isEmpty()) {
return FilterSpec.equal(FILTER_ATTR_EJB_MODULE_DISTINCT, moduleName + '/' + distinctName);
} else {
return FilterSpec.equal(FILTER_ATTR_EJB_MODULE_DISTINCT, appName + '/' + moduleName + '/' + distinctName);
}
} else {
if (appName.isEmpty()) {
return FilterSpec.equal(FILTER_ATTR_EJB_MODULE, moduleName);
} else {
return FilterSpec.equal(FILTER_ATTR_EJB_MODULE, appName + '/' + moduleName);
}
}
}
boolean satisfiesSourceAddress(ServiceURL serviceURL, EJBReceiver receiver) {
final List values = serviceURL.getAttributeValues(FILTER_ATTR_SOURCE_IP);
// treat as match
if (values.isEmpty()) return true;
final URI uri = serviceURL.getLocationURI();
InetSocketAddress sourceAddress = receiver.getSourceAddress(new InetSocketAddress(uri.getHost(), uri.getPort()));
InetAddress inetAddress;
if (sourceAddress != null) {
inetAddress = sourceAddress.getAddress();
} else {
inetAddress = null;
}
for (AttributeValue value : values) {
if (! value.isString()) {
continue;
}
final CidrAddress matchAddress = Inet.parseCidrAddress(value.toString());
if (matchAddress == null) {
// invalid address
continue;
}
// now do the test
if (inetAddress == null) {
if (matchAddress.getNetmaskBits() == 0) {
return true;
}
} else if (matchAddress.matches(inetAddress)) {
return true;
}
}
return false;
}
}
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