io.fabric8.karaf.cm.KubernetesConfigAdminBridge Maven / Gradle / Ivy
/**
* Copyright 2005-2016 Red Hat, Inc.
*
* Red Hat 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 io.fabric8.karaf.cm;
import java.io.StringReader;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import io.fabric8.kubernetes.api.model.ConfigMap;
import io.fabric8.kubernetes.api.model.ConfigMapList;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.KubernetesClientException;
import io.fabric8.kubernetes.client.Watch;
import io.fabric8.kubernetes.client.Watcher;
import io.fabric8.kubernetes.client.utils.Utils;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.ConfigurationPolicy;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.ReferencePolicy;
import org.apache.felix.scr.annotations.References;
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static io.fabric8.karaf.cm.KubernetesConstants.CM_META_KEYS;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CM_BRIDGE_ENABLED;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CM_BRIDGE_ENABLED_DEFAULT;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_MERGE;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_MERGE_DEFAULT;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_META;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_META_DEFAULT;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_PID_CFG;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_WATCH;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_CONFIG_WATCH_DEFAULT;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_K8S_META_NAME;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_K8S_META_NAMESPACE;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_K8S_META_RESOURCE_VERSION;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_META_KEYS;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_PID;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_PID_FILTERS;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_PID_LABEL;
import static io.fabric8.karaf.cm.KubernetesConstants.FABRIC8_PID_LABEL_DEFAULT;
import static io.fabric8.kubernetes.client.utils.Utils.getSystemPropertyOrEnvVar;
@Component(
immediate = true,
policy = ConfigurationPolicy.IGNORE,
createPid = false)
@References({
@Reference(
name = "configAdmin",
referenceInterface = ConfigurationAdmin.class,
policy = ReferencePolicy.STATIC,
cardinality = ReferenceCardinality.MANDATORY_UNARY),
@Reference(
name = "kubernetesClient",
referenceInterface = KubernetesClient.class,
policy = ReferencePolicy.STATIC,
cardinality = ReferenceCardinality.MANDATORY_UNARY)
})
public class KubernetesConfigAdminBridge implements Watcher {
private static final Logger LOGGER = LoggerFactory.getLogger(KubernetesConfigAdminBridge.class);
private final Object lock;
private final AtomicReference configAdmin;
private final AtomicReference kubernetesClient;
private boolean enabled;
private String pidLabel;
private Map filters;
private Watch watch;
private boolean configMerge;
private boolean configMeta;
private boolean configWatch;
public KubernetesConfigAdminBridge() {
this.enabled = FABRIC8_CM_BRIDGE_ENABLED_DEFAULT;
this.lock = new Object();
this.configAdmin = new AtomicReference<>();
this.kubernetesClient = new AtomicReference<>();
this.configMerge = FABRIC8_CONFIG_MERGE_DEFAULT;
this.configMeta = FABRIC8_CONFIG_META_DEFAULT;
this.configWatch = FABRIC8_CONFIG_WATCH_DEFAULT;
this.watch = null;
this.pidLabel = FABRIC8_PID_LABEL_DEFAULT;
this.filters = null;
}
// ***********************
// Lifecycle
// ***********************
@Activate
void activate() {
enabled = getSystemPropertyOrEnvVar(FABRIC8_CM_BRIDGE_ENABLED, enabled);
pidLabel = getSystemPropertyOrEnvVar(FABRIC8_PID_LABEL, pidLabel);
configMerge = getSystemPropertyOrEnvVar(FABRIC8_CONFIG_MERGE, configMerge);
configMeta = getSystemPropertyOrEnvVar(FABRIC8_CONFIG_META, configMeta);
configWatch = getSystemPropertyOrEnvVar(FABRIC8_CONFIG_WATCH, configWatch);
filters = new HashMap<>();
String filterList = getSystemPropertyOrEnvVar(FABRIC8_PID_FILTERS);
if (!Utils.isNullOrEmpty(filterList)) {
for (String filter : filterList.split(",")) {
String[] kv = filter.split("=");
if (kv.length == 2) {
filters.put(kv[0].trim(), kv[1].trim());
}
}
}
if (enabled) {
synchronized (lock) {
watchConfigMapList();
ConfigMapList list = getConfigMapList();
if (list != null) {
for (ConfigMap map : list.getItems()) {
updateConfig(map);
}
}
}
}
}
@Deactivate
void deactivate() {
if (watch != null) {
watch.close();
}
}
// ***********************
// References
// ***********************
protected void bindConfigAdmin(ConfigurationAdmin service) {
this.configAdmin.set(service);
}
protected void unbindConfigAdmin(ConfigurationAdmin service) {
this.configAdmin.compareAndSet(service, null);
}
protected void bindKubernetesClient(KubernetesClient service) {
this.kubernetesClient.set(service);
}
protected void unbindKubernetesClient(KubernetesClient service) {
this.kubernetesClient.compareAndSet(service, null);
}
// ***********************
// Watcher
// ***********************
@Override
public void eventReceived(Action action, ConfigMap map) {
synchronized (lock) {
switch (action) {
case ADDED:
case MODIFIED:
updateConfig(map);
break;
case DELETED:
case ERROR:
deleteConfig(map);
break;
}
}
}
@Override
public void onClose(KubernetesClientException e) {
}
// **********************
// ConfigAdmin
// **********************
private void updateConfig(ConfigMap map) {
Long ver = Long.parseLong(map.getMetadata().getResourceVersion());
String pid = map.getMetadata().getLabels().get(pidLabel);
String[] p = parsePid(pid);
try {
final Configuration config = getConfiguration(configAdmin.get(), pid, p[0], p[1]);
final Map configMapData = map.getData();
if (configMapData == null) {
LOGGER.debug("Ignoring configuration pid={}, (empty)", config.getPid());
return;
}
final Dictionary props = config.getProperties();
final Hashtable configAdmCfg = props != null ? new Hashtable() : null;
Hashtable configMapCfg = new Hashtable<>();
/*
* If there is a key named as pid + ".cfg" (as the pid file on karaf)
* it will be used as source of configuration instead of the content
* of the data field. The name of the key can be changed by setting
* the key fabric8.config.pid.cfg
*
* i.e.
* apiVersion: v1
* data:
* org.ops4j.pax.logging.cfg: |+
* log4j.rootLogger=DEBUG, out
*/
String pidCfg = configMapData.get(FABRIC8_CONFIG_PID_CFG);
if (pidCfg == null) {
pidCfg = pid + ".cfg";
}
String cfgString = configMapData.get(pidCfg);
if (Utils.isNotNullOrEmpty(cfgString)) {
java.util.Properties cfg = new java.util.Properties();
cfg.load(new StringReader(cfgString));
for(Map.Entry entry: cfg.entrySet()) {
configMapCfg.put((String)entry.getKey(), entry.getValue());
}
} else {
for (Map.Entry entry : map.getData().entrySet()) {
configMapCfg.put(entry.getKey(), entry.getValue());
}
}
/*
* Configure if mete-data should be added to the Config Admin or not
*/
boolean meta = configMapData.containsKey(FABRIC8_CONFIG_META)
? Boolean.valueOf(configMapData.get(FABRIC8_CONFIG_META))
: configMeta;
/*
* Configure if ConfigMap data should be merge with ConfigAdmin or it
* should override it.
*/
boolean merge = configMapData.containsKey(FABRIC8_CONFIG_MERGE)
? Boolean.valueOf(configMapData.get(FABRIC8_CONFIG_MERGE))
: configMerge;
if (configAdmCfg != null) {
Long oldVer = (Long)props.get(FABRIC8_K8S_META_RESOURCE_VERSION);
if (oldVer != null && (oldVer >= ver)) {
LOGGER.debug("Ignoring configuration pid={}, oldVersion={} newVersion={} (no changes)", config.getPid(), oldVer, ver);
return;
}
for (Enumeration e = props.keys(); e.hasMoreElements();) {
String key = e.nextElement();
Object val = props.get(key);
configAdmCfg.put(key, val);
}
}
if (shouldUpdate(configAdmCfg, configMapCfg)) {
LOGGER.debug("Updating configuration pid={}", config.getPid());
if (meta) {
configMapCfg.put(FABRIC8_PID, pid);
configMapCfg.put(FABRIC8_K8S_META_RESOURCE_VERSION, ver);
configMapCfg.put(FABRIC8_K8S_META_NAME, map.getMetadata().getName());
configMapCfg.put(FABRIC8_K8S_META_NAMESPACE, map.getMetadata().getNamespace());
}
if (merge && configAdmCfg != null) {
for(Map.Entry entry : configMapCfg.entrySet()) {
// Do not override ConfigAdmin meta data
if (!CM_META_KEYS.contains(entry.getKey())) {
configAdmCfg.put(entry.getKey(), entry.getValue());
}
}
configMapCfg = configAdmCfg;
}
config.update(configMapCfg);
} else {
LOGGER.debug("Ignoring configuration pid={} (no changes)", config.getPid());
}
} catch (Exception e) {
LOGGER.warn("", e);
}
}
private void deleteConfig(ConfigMap map) {
String pid = map.getMetadata().getLabels().get(pidLabel);
String[] p = parsePid(pid);
try {
Map configMapData = map.getData();
Configuration config = getConfiguration(configAdmin.get(), pid, p[0], p[1]);
if (configMapData != null) {
boolean merge = configMapData.containsKey(FABRIC8_CONFIG_MERGE)
? Boolean.valueOf(configMapData.get(FABRIC8_CONFIG_MERGE))
: configMerge;
if (!merge) {
LOGGER.debug("Delete configuration {}", config.getPid());
config.delete();
}
}
} catch (Exception e) {
LOGGER.warn("", e);
}
}
// ***********************
// Helpers
// ***********************
private String[] parsePid(String pid) {
String factoryPid = null;
int n = pid.indexOf('-');
if (n > 0) {
factoryPid = pid.substring(n + 1);
pid = pid.substring(0, n);
}
return new String[] { pid, factoryPid };
}
private ConfigMapList getConfigMapList() {
KubernetesClient client = kubernetesClient.get();
return client != null
? client.configMaps().withLabel(pidLabel).withLabels(filters).list()
: null;
}
private void watchConfigMapList() {
if (configWatch) {
KubernetesClient client = kubernetesClient.get();
if (client != null) {
watch = client.configMaps().withLabel(pidLabel).withLabels(filters).watch(this);
} else {
throw new RuntimeException("KubernetesClient not set");
}
}
}
private Configuration getConfiguration(ConfigurationAdmin configAdmin, String fabric8pid, String pid, String factoryPid) throws Exception {
String filter = "(" + FABRIC8_PID + "=" + fabric8pid + ")";
Configuration[] oldConfiguration = configAdmin.listConfigurations(filter);
if (oldConfiguration != null && oldConfiguration.length > 0) {
return oldConfiguration[0];
} else {
return factoryPid != null
? configAdmin.createFactoryConfiguration(pid, null)
: configAdmin.getConfiguration(pid, null);
}
}
private boolean shouldUpdate(Hashtable configAdmCfg, Hashtable configMapCfg) {
if (configAdmCfg == null) {
return true;
}
for(Map.Entry entry : configMapCfg.entrySet()) {
// Do not compare meta data
if (FABRIC8_META_KEYS.contains(entry.getKey())) {
continue;
}
Object value = configAdmCfg.get(entry.getKey());
if (value == null) {
return true;
}
if (!value.equals(entry.getValue())) {
return true;
}
}
return false;
}
}
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