Github user grkvlt commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/177#discussion_r65986042
--- Diff:
core/src/main/java/org/apache/brooklyn/core/location/access/PublicNetworkFaceEnricher.java
---
@@ -0,0 +1,373 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.apache.brooklyn.core.location.access;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.Collection;
+
+import org.apache.brooklyn.api.entity.Entity;
+import org.apache.brooklyn.api.entity.EntityLocal;
+import org.apache.brooklyn.api.location.Location;
+import org.apache.brooklyn.api.location.MachineLocation;
+import org.apache.brooklyn.api.sensor.AttributeSensor;
+import org.apache.brooklyn.api.sensor.SensorEvent;
+import org.apache.brooklyn.api.sensor.SensorEventListener;
+import org.apache.brooklyn.config.ConfigKey;
+import org.apache.brooklyn.core.config.ConfigKeys;
+import org.apache.brooklyn.core.enricher.AbstractEnricher;
+import org.apache.brooklyn.core.entity.AbstractEntity;
+import org.apache.brooklyn.core.location.Machines;
+import org.apache.brooklyn.core.sensor.Sensors;
+import org.apache.brooklyn.util.core.flags.TypeCoercions;
+import org.apache.brooklyn.util.exceptions.Exceptions;
+import org.apache.brooklyn.util.guava.Maybe;
+import org.apache.brooklyn.util.net.Networking;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Predicates;
+import com.google.common.collect.Lists;
+import com.google.common.net.HostAndPort;
+import com.google.common.reflect.TypeToken;
+
+/**
+ * Can be added to an entity so that it advertises its mapped ports
(according to the port-mappings
+ * recorded in the PortForwardManager). This can be used with sensors of
type URI, HostAndPort
+ * or plain integer port values. The port-mappings is retrieved by looking
up the entity's machine
+ * and the private port, in the PortForwardManager's recorded
port-mappings.
+ *
+ * For example, to configure each Tomcat node to publish its mapped uri,
and to use that sensor
+ * in Nginx for the target servers:
+ * <pre>
+ * {@code
+ * services:
+ * - type: cluster
+ * id: cluster
+ * brooklyn.config:
+ * memberSpec:
+ * $brooklyn:entitySpec:
+ * type: org.apache.brooklyn.entity.webapp.tomcat.TomcatServer
+ * brooklyn.enrichers:
+ * - type:
org.apache.brooklyn.core.location.access.PublicNetworkFaceEnricher
+ * brooklyn.config:
+ * sensor: main.uri
+ * - type: org.apache.brooklyn.entity.proxy.nginx.NginxController
+ * brooklyn.config:
+ * member.sensor.hostandport:
$brooklyn:sensor("main.uri.mapped.public")
+ * serverPool: cluster
+ * }
+ * </pre>
+ */
+@Beta
+public class PublicNetworkFaceEnricher extends AbstractEnricher {
+
+ // TODO Is this the best package for the enricher?
+ //
+ // TODO Need more logging, particularly for when the value has *not*
been transformed.
+ //
+ // TODO What if the sensor has an unrelated hostname - we will
currently still transform this!
+ // That seems acceptable: if the user configures it to look at the
sensor, then we can make
+ // assumptions that the sensor's value will need translated.
+ //
+ // TODO If there is no port-mapping, should we advertise the original
sensor value?
+ // That would allow the enricher to be used for an entity in a private
network, and for
+ // it to be a no-op in a public cloud (so the same blueprint can be
used in both).
+ // However I don't think we should publish the original value: it
could be the association
+ // just hasn't been created yet. If we publish the wrong (i.e.
untransformed) value, that
+ // will cause other entity's using attributeWhenReady to immediately
trigger.
+
+ private static final Logger LOG =
LoggerFactory.getLogger(PublicNetworkFaceEnricher.class);
+
+ @SuppressWarnings("serial")
+ public static final ConfigKey<AttributeSensor<?>> SENSOR =
ConfigKeys.newConfigKey(
+ new TypeToken<AttributeSensor<?>>() {},
+ "sensor",
+ "The sensor whose mapped value is to be re-published (with
suffix \"mapped.public\"); "
+ + "either 'sensor' or 'sensors' should be specified");
+
+ @SuppressWarnings("serial")
+ public static ConfigKey<Collection<? extends AttributeSensor<?>>>
SENSORS = ConfigKeys.newConfigKey(
+ new TypeToken<Collection<? extends AttributeSensor<?>>>() {},
+ "sensors",
+ "The multiple sensors whose mapped values are to be
re-published (with suffix \"mapped.public\"); "
+ + "either 'sensor' or 'sensors' should be specified");
+
+ public static final ConfigKey<PortForwardManager> PORT_FORWARD_MANAGER
= ConfigKeys.newConfigKey(
+ PortForwardManager.class,
+ "portForwardManager",
+ "The PortForwardManager storing the port-mappings; if null,
the global instance will be used");
+
+ protected Collection<AttributeSensor<?>> sensors;
+ protected PortForwardManager.AssociationListener listener;
+
+ @Override
+ public void setEntity(final EntityLocal entity) {
+ super.setEntity(entity);
+
+ sensors = resolveSensorsConfig();
+
+ /*
+ * To find the transformed sensor value we need several things to
be set. Therefore
+ * subscribe to all of them, and re-compute whenever any of the
change. These are:
+ * - A port-mapping to exist for the relevant machine + private
port.
+ * - The entity to have a machine location (so we can lookup the
mapped port association).
+ * - The relevant sensors to have a value, which includes the
private port.
+ */
+ listener = new PortForwardManager.AssociationListener() {
+ @Override
+ public void
onAssociationCreated(PortForwardManager.AssociationMetadata metadata) {
+ Maybe<MachineLocation> machine = getMachine();
+ if (!(machine.isPresent() &&
machine.get().equals(metadata.getLocation()))) {
+ // not related to this entity's machine; ignoring
+ return;
+ }
+
+ LOG.debug("{} attempting transformations, triggered by
port-association {}, with machine {} of entity {}",
+ new Object[] {PublicNetworkFaceEnricher.this,
metadata, machine.get(), entity});
+ tryTransformAll();
+ }
+ @Override
+ public void
onAssociationDeleted(PortForwardManager.AssociationMetadata metadata) {
+ // no-op
+ }
+ };
+ getPortForwardManager().addAssociationListener(listener,
Predicates.alwaysTrue());
+
+ subscriptions().subscribe(entity, AbstractEntity.LOCATION_ADDED,
new SensorEventListener<Location>() {
+ @Override public void onEvent(SensorEvent<Location> event) {
+ LOG.debug("{} attempting transformations, triggered by
location-added {}, to {}", new Object[] {PublicNetworkFaceEnricher.this,
event.getValue(), entity});
+ tryTransformAll();
+ }});
+
+ for (AttributeSensor<?> sensor : sensors) {
+ subscriptions().subscribe(entity, sensor, new
SensorEventListener<Object>() {
+ @Override public void onEvent(SensorEvent<Object> event) {
+ LOG.debug("{} attempting transformations, triggered by
sensor-event {}->{}, to {}",
+ new Object[] {PublicNetworkFaceEnricher.this,
event.getSensor().getName(), event.getValue(), entity});
+ tryTransform((AttributeSensor<?>)event.getSensor());
+ }});
+ }
+
+ tryTransformAll();
+ }
+
+ @Override
+ public void destroy() {
+ try {
+ if (listener != null) {
+
getPortForwardManager().removeAssociationListener(listener);
+ }
+ } finally {
+ super.destroy();
+ }
+ }
+
+ protected void tryTransformAll() {
+ Maybe<MachineLocation> machine = getMachine();
+ if (machine.isAbsent()) {
+ return;
+ }
+ for (AttributeSensor<?> sensor : sensors) {
+ try {
+ tryTransform(machine.get(), sensor);
+ } catch (Exception e) {
+ // TODO Avoid repeated logging
+ Exceptions.propagateIfFatal(e);
+ LOG.warn("Problem transforming sensor "+sensor+" of
"+entity, e);
+ }
+ }
+ }
+
+ protected void tryTransform(AttributeSensor<?> sensor) {
+ Maybe<MachineLocation> machine = getMachine();
+ if (machine.isAbsent()) {
+ return;
+ }
+ tryTransform(machine.get(), sensor);
+ }
+
+ protected void tryTransform(MachineLocation machine,
AttributeSensor<?> sensor) {
+ Object sensorVal = entity.sensors().get(sensor);
+ if (sensorVal == null) {
+ return;
+ }
+ Maybe<String> newVal = transformVal(machine, sensor, sensorVal);
+ if (newVal.isAbsent()) {
+ return;
+ }
+ AttributeSensor<String> mappedSensor =
Sensors.newStringSensor(sensor.getName()+".mapped.public");
+ if (newVal.get().equals(entity.sensors().get(mappedSensor))) {
+ // ignore duplicate
+ return;
+ }
+ LOG.debug("{} publishing value {} for transformed sensor {}, of
entity {}",
+ new Object[] {this, newVal.get(), sensor, entity});
+ entity.sensors().set(mappedSensor, newVal.get());
+ }
+
+ protected Maybe<String> transformVal(MachineLocation machine,
AttributeSensor<?> sensor, Object sensorVal) {
+ if (sensorVal == null) {
+ return Maybe.absent();
+ } else if (isPort(sensorVal)) {
+ int port = toInteger(sensorVal);
+ return transformPort(entity, machine, port);
+ } else if (isUri(sensorVal)) {
+ return transformUri(entity, machine, sensorVal.toString());
+ } else if (isHostAndPort(sensorVal)) {
+ return transformHostAndPort(entity, machine,
sensorVal.toString());
+ } else {
+ // no-op; unrecognised type
+ return Maybe.absent();
+ }
+ }
+
+ protected boolean isUri(Object sensorVal) {
+ if (sensorVal instanceof URI || sensorVal instanceof URL) {
+ return true;
+ }
+ try {
+ new URI(sensorVal.toString());
--- End diff --
@neykov remember we aren't doing this on every sensor, only the ones we
have configured.
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