Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/180#discussion_r50872609
--- Diff:
nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/AbstractElasticsearchProcessor.java
---
@@ -0,0 +1,207 @@
+/*
+ * 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.nifi.processors.elasticsearch;
+
+import org.apache.nifi.annotation.lifecycle.OnStopped;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.Validator;
+import org.apache.nifi.logging.ProcessorLog;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.ssl.SSLContextService;
+import org.apache.nifi.util.StringUtils;
+import org.elasticsearch.client.Client;
+import org.elasticsearch.client.transport.TransportClient;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.common.transport.InetSocketTransportAddress;
+
+import java.net.InetSocketAddress;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicReference;
+
+
+public abstract class AbstractElasticsearchProcessor extends
AbstractProcessor {
+
+ protected static final PropertyDescriptor CLUSTER_NAME = new
PropertyDescriptor.Builder()
+ .name("Cluster Name")
+ .description("Name of the ES cluster (for example,
elasticsearch_brew). Defaults to 'elasticsearch'")
+ .required(false)
+ .addValidator(Validator.VALID)
+ .build();
+ protected static final PropertyDescriptor HOSTS = new
PropertyDescriptor.Builder()
+ .name("ElasticSearch Hosts")
+ .description("ElasticSearch Hosts, which should be comma
separated and colon for hostname/port "
+ + "host1:port,host2:port,.... For example
testcluster:9200.")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor PROP_SSL_CONTEXT_SERVICE = new
PropertyDescriptor.Builder()
+ .name("SSL Context Service")
+ .description("The SSL Context Service used to provide client
certificate information for TLS/SSL "
+ + "connections. This service only applies if the
Shield plugin is available.")
+ .required(false)
+ .identifiesControllerService(SSLContextService.class)
+ .build();
+
+ public static final PropertyDescriptor PROP_SHIELD_LOCATION = new
PropertyDescriptor.Builder()
+ .name("Shield plugin URL")
+ .description("Specifies the location of the JAR for the
Elasticsearch Shield plugin."
+ + " If the Elasticsearch cluster has been secured with
the Shield plugin, then "
+ + "an SSL Context Service must be defined, and the
Shield plugin JAR must also "
+ + "be available to this processor.")
+ .required(false)
+ .addValidator(StandardValidators.URL_VALIDATOR)
+ .build();
+
+ protected static final PropertyDescriptor PING_TIMEOUT = new
PropertyDescriptor.Builder()
+ .name("ElasticSearch Ping Timeout")
+ .description("The ping timeout used to determine when a node
is unreachable. " +
+ "For example, 5s (5 seconds). If non-local recommended
is 30s")
+ .required(true)
+ .defaultValue("5s")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ protected static final PropertyDescriptor SAMPLER_INTERVAL = new
PropertyDescriptor.Builder()
+ .name("Sampler Interval")
+ .description("Node sampler interval. For example, 5s (5
seconds) If non-local recommended is 30s")
+ .required(true)
+ .defaultValue("5s")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ protected AtomicReference<Client> esClient = new AtomicReference<>();
+ protected List<InetSocketAddress> esHosts;
+
+ /**
+ * Instantiate ElasticSearch Client. This should be called by
subclasses' onTrigger() method to create a client
+ * if one does not yet exist. The client will be destroyed when the
processor is stopped.
+ *
+ * @param context The context for this processor
+ * @throws ProcessException if an error occurs while creating an
Elasticsearch client
+ */
+ protected void createClient(ProcessContext context) throws
ProcessException {
+
+ ProcessorLog log = getLogger();
+ if (esClient.get() != null) {
+ return;
+ }
+
+ log.info("Creating ElasticSearch Client");
+
+ try {
+ final String clusterName =
context.getProperty(CLUSTER_NAME).toString();
+ final String pingTimeout =
context.getProperty(PING_TIMEOUT).toString();
+ final String samplerInterval =
context.getProperty(SAMPLER_INTERVAL).toString();
+
+ final SSLContextService sslService =
+
context.getProperty(PROP_SSL_CONTEXT_SERVICE).asControllerService(SSLContextService.class);
+
+ Settings.Builder settingsBuilder = Settings.settingsBuilder()
+ .put("cluster.name", clusterName)
+ .put("client.transport.ping_timeout", pingTimeout)
+ .put("client.transport.nodes_sampler_interval",
samplerInterval);
+
+ if (sslService != null) {
+ settingsBuilder.put("shield.transport.ssl", "true")
+ .put("shield.ssl.keystore.path",
sslService.getKeyStoreFile())
+ .put("shield.ssl.keystore.password",
sslService.getKeyStorePassword())
+ .put("shield.ssl.truststore.path",
sslService.getTrustStoreFile())
+ .put("shield.ssl.truststore.password",
sslService.getTrustStorePassword());
+
+ }
+ //create new transport client
+ TransportClient.Builder builder = TransportClient.builder();
+
+ // See if the Elasticsearch Shield JAR location was specified,
and add the plugin if so
+ String shieldUrl =
context.getProperty(PROP_SHIELD_LOCATION).getValue();
+ final ClassLoader originalClassLoader =
Thread.currentThread().getContextClassLoader();
+ if (!StringUtils.isBlank(shieldUrl)) {
+ Thread.currentThread().setContextClassLoader(
+ new URLClassLoader(new URL[]{new URL(shieldUrl)},
this.getClass().getClassLoader()));
+ }
+ try {
+ Class shieldPluginClass =
Class.forName("org.elasticsearch.shield.ShieldPlugin", true,
+ Thread.currentThread().getContextClassLoader());
+ builder = builder.addPlugin(shieldPluginClass);
+ } catch (ClassNotFoundException cnfe) {
+ log.debug("Did not detect Elasticsearch Shield plugin,
secure connections will not be available");
+ }
+
+ TransportClient transportClient =
builder.settings(settingsBuilder.build()).build();
+
Thread.currentThread().setContextClassLoader(originalClassLoader);
+
+ final String hosts = context.getProperty(HOSTS).toString();
+ esHosts = GetEsHosts(hosts);
+
+ if (esHosts != null) {
+ for (final InetSocketAddress host : esHosts) {
+ transportClient.addTransportAddress(new
InetSocketTransportAddress(host));
+ }
+ }
+ esClient.set(transportClient);
+
+ } catch (Exception e) {
+ log.error("Failed to create Elasticsearch client due to {}",
new Object[]{e}, e);
+ throw new ProcessException(e);
+ }
+ }
+
+ /**
+ * Dispose of ElasticSearch client
+ */
+ @OnStopped
+ public final void closeClient() {
+ if (esClient.get() != null) {
+ getLogger().info("Closing ElasticSearch Client");
+ esClient.get().close();
+ esClient.set(null);
+ }
+ }
+
+ /**
+ * Get the ElasticSearch hosts from a Nifi attribute, e.g.
+ *
+ * @param hosts A comma-separated list of ElasticSearch hosts
(host:port,host2:port2, etc.)
+ * @return List of InetSocketAddresses for the ES hosts
+ */
+ private List<InetSocketAddress> GetEsHosts(String hosts) {
--- End diff --
Should this be named getEsHosts rather than GetEsHosts?
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