/**
* Copyright 2015-2016 Red Hat, Inc, and individual contributors.
*
* 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.wildfly.swarm.topology.openshift.runtime;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import com.openshift.restclient.IClient;
import com.openshift.restclient.IOpenShiftWatchListener;
import com.openshift.restclient.IWatcher;
import com.openshift.restclient.ResourceKind;
import com.openshift.restclient.model.IResource;
import com.openshift.restclient.model.IService;
import org.jboss.msc.inject.Injector;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
import org.jboss.msc.value.InjectedValue;
import org.wildfly.swarm.topology.runtime.Registration;
import org.wildfly.swarm.topology.runtime.TopologyManager;
/**
* @author Bob McWhirter
* @author Ken Finnigan
*/
public class ServiceWatcher implements Service<ServiceWatcher>, IOpenShiftWatchListener {
public static final ServiceName SERVICE_NAME = OpenShiftTopologyConnector.SERVICE_NAME.append("service-watcher");
public static final int DEFAULT_HTTPS_PORT = 8443;
private static final String TOPOLOGY_SOURCE_KEY = "openshift";
public Injector<IClient> getClientInjector() {
return this.clientInjector;
}
public Injector<String> getNamespaceInjector() {
return this.namespaceInjector;
}
public Injector<TopologyManager> getTopologyManagerInjector() {
return this.topologyManagerInjector;
}
@Override
public void start(StartContext context) throws StartException {
startWatcher();
}
@Override
public void stop(StopContext context) {
if (openShiftWatcher != null) {
openShiftWatcher.stop();
}
}
@Override
public ServiceWatcher getValue() throws IllegalStateException, IllegalArgumentException {
return this;
}
private void startWatcher() {
IClient client = clientInjector.getValue();
listenerState.set(ListenerState.STARTING);
openShiftWatcher = client.watch(namespaceInjector.getValue(), this, ResourceKind.SERVICE);
}
@Override
public void connected(List<IResource> resources) {
this.listenerState.set(ListenerState.CONNECTED);
resources.stream()
.filter(p -> p.getKind().equals(ResourceKind.SERVICE))
.forEach(r -> {
Set<Registration> regs = registrationsForService((IService) r);
regs.forEach(topologyManagerInjector.getValue()::register);
});
}
@Override
public void disconnected() {
if (listenerState.get().equals(ListenerState.RESTARTING)) {
// Restarting so ignore disconnect
return;
}
// De-register all endpoints
topologyManagerInjector.getValue().unregisterAll(TOPOLOGY_SOURCE_KEY);
listenerState.set(ListenerState.DISCONNECTED);
}
@Override
public void received(IResource resource, ChangeType change) {
if (change.equals(ChangeType.ADDED)) {
// Add new Service to topology
IService service = (IService) resource;
registrationsForService(service)
.forEach(topologyManagerInjector.getValue()::register);
} else if (change.equals(ChangeType.DELETED)) {
// Remove Service from topology
topologyManagerInjector.getValue().unregisterAll(TOPOLOGY_SOURCE_KEY, resource.getName());
}
}
@Override
public void error(Throwable err) {
// Log the error ??
restart();
}
private void restart() {
switch (listenerState.get()) {
case STARTING:
// Trace.debug("Returning early from restart. Already starting for project {0} and kind {1}", project.getName(), kind);
case DISCONNECTED:
// Trace.debug("Endpoint disconnected and skipping restart for project {0} and kind {1}", project.getName(), kind);
return;
default:
}
if (openShiftWatcher != null) {
listenerState.set(ListenerState.RESTARTING);
openShiftWatcher.stop();
}
startWatcher();
}
private Set<Registration> registrationsForService(IService service) {
Set<Registration> newEntries = new HashSet<>();
// Only expose the service's default port and anything running on the https port
service.getPorts()
.stream()
.filter(servicePort -> servicePort.getPort() == service.getPort() || servicePort.getPort() == DEFAULT_HTTPS_PORT)
.forEach(servicePort -> {
Registration registration = new Registration(TOPOLOGY_SOURCE_KEY,
service.getName(),
service.getName(),
servicePort.getPort());
if (servicePort.getPort() == DEFAULT_HTTPS_PORT) {
registration.addTags(Collections.singletonList("https"));
} else if (servicePort.getPort() == service.getPort()) {
registration.addTags(Collections.singletonList("http"));
}
newEntries.add(registration);
});
return newEntries;
}
private enum ListenerState {
STARTING,
CONNECTED,
RESTARTING,
DISCONNECTED
}
private InjectedValue<IClient> clientInjector = new InjectedValue<>();
private InjectedValue<String> namespaceInjector = new InjectedValue<>();
private InjectedValue<TopologyManager> topologyManagerInjector = new InjectedValue<>();
private IWatcher openShiftWatcher;
private AtomicReference<ListenerState> listenerState = new AtomicReference<>(ListenerState.DISCONNECTED);
}