/**
* 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.camel.component.etcd.cloud;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import com.fasterxml.jackson.databind.ObjectMapper;
import mousio.etcd4j.EtcdClient;
import mousio.etcd4j.requests.EtcdKeyGetRequest;
import mousio.etcd4j.responses.EtcdKeysResponse;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.cloud.ServiceDefinition;
import org.apache.camel.component.etcd.EtcdConfiguration;
import org.apache.camel.component.etcd.EtcdHelper;
import org.apache.camel.impl.cloud.DefaultServiceDiscovery;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
abstract class EtcdServiceDiscovery extends DefaultServiceDiscovery {
private static final Logger LOGGER = LoggerFactory.getLogger(EtcdServiceDiscovery.class);
private static final ObjectMapper MAPPER = EtcdHelper.createObjectMapper();
private final EtcdConfiguration configuration;
private EtcdClient client;
EtcdServiceDiscovery(EtcdConfiguration configuration) {
this.configuration = configuration;
this.client = null;
}
@Override
protected void doStart() throws Exception {
if (client == null) {
client = configuration.createClient();
}
}
@Override
protected void doStop() throws Exception {
if (client != null) {
client.close();
client = null;
}
}
protected EtcdConfiguration getConfiguration() {
return this.configuration;
}
protected EtcdClient getClient() {
return this.client;
}
protected EtcdServiceDefinition nodeFromString(String value) {
EtcdServiceDefinition server = null;
try {
server = MAPPER.readValue(value, EtcdServiceDefinition.class);
} catch (Exception e) {
LOGGER.warn("", e);
}
return server;
}
protected List<ServiceDefinition> getServices() {
return getServices(s -> true);
}
protected List<ServiceDefinition> getServices(Predicate<EtcdServiceDefinition> filter) {
List<ServiceDefinition> servers = Collections.emptyList();
if (isRunAllowed()) {
try {
final EtcdConfiguration conf = getConfiguration();
final EtcdKeyGetRequest request = getClient().get(conf.getServicePath()).recursive();
if (conf.hasTimeout()) {
request.timeout(conf.getTimeout(), TimeUnit.SECONDS);
}
final EtcdKeysResponse response = request.send().get();
if (Objects.nonNull(response.node) && !response.node.nodes.isEmpty()) {
servers = response.node.nodes.stream()
.map(node -> node.value)
.filter(ObjectHelper::isNotEmpty)
.map(this::nodeFromString)
.filter(Objects::nonNull)
.filter(filter)
.sorted(EtcdServiceDefinition.COMPARATOR)
.collect(Collectors.toList());
}
} catch (Exception e) {
throw new RuntimeCamelException(e);
}
}
return servers;
}
}