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Registration.java
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Registration.java
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/*
* Copyright The Cryostat Authors
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or data
* (collectively the "Software"), free of charge and under any and all copyright
* rights in the Software, and any and all patent rights owned or freely
* licensable by each licensor hereunder covering either (i) the unmodified
* Software as contributed to or provided by such licensor, or (ii) the Larger
* Works (as defined below), to deal in both
*
* (a) the Software, and
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software (each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
* The above copyright notice and either this complete permission notice or at
* a minimum a reference to the UPL must be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package io.cryostat.agent;
import java.net.URI;
import java.net.UnknownHostException;
import java.time.Instant;
import java.util.Set;
import java.util.UUID;
import io.cryostat.agent.model.DiscoveryNode;
import io.cryostat.agent.model.PluginInfo;
import dagger.Lazy;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import io.vertx.core.eventbus.MessageConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class Registration extends AbstractVerticle {
static final String EVENT_BUS_ADDRESS = Registration.class.getName() + ".UPDATE";
private static final String NODE_TYPE = "JVM";
private final Logger log = LoggerFactory.getLogger(getClass());
private final Lazy<WebServer> webServer;
private final CryostatClient cryostat;
private final UUID instanceId;
private final String appName;
private final String realm;
private final String hostname;
private final int jmxPort;
private final int registrationRetryMs;
private final PluginInfo pluginInfo = new PluginInfo();
private volatile String webServerId;
private MessageConsumer<Object> consumer;
Registration(
Lazy<WebServer> webServer,
CryostatClient cryostat,
UUID instanceId,
String appName,
String realm,
String hostname,
int jmxPort,
int registrationRetryMs) {
this.webServer = webServer;
this.cryostat = cryostat;
this.instanceId = instanceId;
this.appName = appName;
this.realm = realm;
this.hostname = hostname;
this.jmxPort = jmxPort;
this.registrationRetryMs = registrationRetryMs;
}
@Override
public void start() {
getVertx().setTimer(1, this::tryRegister);
log.info("{} started", getClass().getName());
consumer =
getVertx()
.eventBus()
.consumer(
EVENT_BUS_ADDRESS,
msg -> {
log.info("Called back, attempting to re-register");
vertx.setTimer(1, this::tryRegister);
});
}
private void tryRegister(Long id) {
cryostat.register(pluginInfo)
.onSuccess(
plugin -> {
this.pluginInfo.copyFrom(plugin);
log.info("Registered as {}", plugin.getId());
Future<String> serverId;
if (this.webServerId != null) {
serverId = Future.succeededFuture(this.webServerId);
} else {
serverId =
getVertx()
.deployVerticle(webServer.get())
.onSuccess(i -> this.webServerId = i);
}
serverId.onSuccess(unused -> tryUpdate(id));
})
.onFailure(
t -> {
log.error("Registration failure", t);
log.info("Registration retry period: {}(ms)", registrationRetryMs);
this.webServerId = null;
vertx.setTimer(registrationRetryMs, this::tryRegister);
});
}
void tryUpdate() {
tryUpdate(null);
}
private void tryUpdate(Long id) {
if (!this.pluginInfo.isInitialized()) {
return;
}
DiscoveryNode selfNode;
try {
selfNode = defineSelf();
} catch (UnknownHostException uhe) {
log.error("Unable to define self", uhe);
return;
}
log.info("publishing self as {}", selfNode.getTarget().getConnectUrl());
cryostat.update(pluginInfo, Set.of(selfNode))
.onSuccess(
ar -> {
if (id != null) {
getVertx().cancelTimer(id);
}
})
.onFailure(
t -> {
log.error("Update failure", t);
deregister()
.onComplete(
ar -> {
if (ar.failed()) {
vertx.setTimer(
registrationRetryMs, this::tryRegister);
return;
}
});
});
}
private DiscoveryNode defineSelf() throws UnknownHostException {
long pid = ProcessHandle.current().pid();
String javaMain = System.getProperty("sun.java.command", System.getenv("JAVA_MAIN_CLASS"));
if (StringUtils.isBlank(javaMain)) {
log.error("Unable to determine application mainclass");
javaMain = null;
}
long startTime =
ProcessHandle.current()
.info()
.startInstant()
.orElse(Instant.EPOCH)
.getEpochSecond();
DiscoveryNode.Target target =
new DiscoveryNode.Target(
realm,
URI.create(
String.format(
"service:jmx:rmi:///jndi/rmi://%s:%d/jmxrmi",
hostname, jmxPort)),
appName,
instanceId,
pid,
hostname,
jmxPort,
javaMain,
startTime);
DiscoveryNode selfNode =
new DiscoveryNode(appName + "-" + pluginInfo.getId(), NODE_TYPE, target);
return selfNode;
}
@Override
public void stop() {
if (consumer != null) {
consumer.unregister();
}
log.info("{} stopped", getClass().getName());
}
Future<Void> deregister() {
if (!this.pluginInfo.isInitialized()) {
return Future.succeededFuture();
}
return cryostat.deregister(pluginInfo)
.onComplete(
ar -> {
if (this.webServerId != null) {
getVertx().undeploy(this.webServerId);
}
})
.onComplete(
ar -> {
if (ar.failed()) {
log.warn(
"Failed to deregister as Cryostat discovery plugin [{}]",
this.pluginInfo.getId());
} else {
log.info(
"Deregistered from Cryostat discovery plugin [{}]",
this.pluginInfo.getId());
}
this.pluginInfo.clear();
});
}
}