Github user apiri commented on a diff in the pull request:
https://github.com/apache/nifi/pull/91#discussion_r43917951
--- Diff:
nifi-nar-bundles/nifi-riemann-bundle/nifi-riemann-processors/src/main/java/org/apache/nifi/processors/riemann/PutRiemann.java
---
@@ -0,0 +1,376 @@
+/*
+ * 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.riemann;
+
+import com.aphyr.riemann.Proto;
+import com.aphyr.riemann.Proto.Event;
+import com.aphyr.riemann.client.RiemannClient;
+import org.apache.nifi.annotation.behavior.DynamicProperty;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.annotation.lifecycle.OnStopped;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.PropertyValue;
+import org.apache.nifi.components.Validator;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+@Tags({"riemann", "monitoring", "metrics"})
+@DynamicProperty(name = "Custom Event Attribute",
supportsExpressionLanguage = true,
+ description = "These values will be attached to the Riemann event as a
custom attribute",
+ value = "Any value or expression")
+@CapabilityDescription("Send events to Riemann")
+@SupportsBatching
+public class PutRiemann extends AbstractProcessor {
+ protected enum Transport {
+ TCP, UDP
+ }
+
+ protected RiemannClient riemannClient = null;
+ protected Transport transport;
+
+ public static final Relationship REL_SUCCESS = new Relationship.Builder()
+ .name("success")
+ .description("Metrics successfully written to Riemann")
+ .build();
+
+ public static final Relationship REL_FAILURE = new Relationship.Builder()
+ .name("failure")
+ .description("Metrics which failed to write to Riemann")
+ .build();
+
+
+ public static final PropertyDescriptor RIEMANN_HOST = new
PropertyDescriptor.Builder()
+ .name("Riemann Address")
+ .description("Hostname of Riemann server")
+ .required(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor RIEMANN_PORT = new
PropertyDescriptor.Builder()
+ .name("Riemann Port")
+ .description("Port that Riemann is listening on")
+ .required(true)
+ .defaultValue("5555")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .addValidator(StandardValidators.INTEGER_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor TRANSPORT_PROTOCOL = new
PropertyDescriptor.Builder()
+ .name("Transport Protocol")
+ .description("Transport protocol to speak to Riemann in")
+ .required(true)
+ .allowableValues(new Transport[]{Transport.TCP, Transport.UDP})
+ .defaultValue("TCP")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor BATCH_SIZE = new
PropertyDescriptor.Builder()
+ .name("Batch Size")
+ .description("Batch size for incoming FlowFiles")
+ .required(false)
+ .defaultValue("100")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .addValidator(StandardValidators.INTEGER_VALIDATOR)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .build();
+
+ // Attributes Mappings
+ public static final PropertyDescriptor ATTR_SERVICE = new
PropertyDescriptor.Builder()
+ .name("Service")
+ .description("Name of service for the event")
+ .required(false)
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .build();
+
+ public static final PropertyDescriptor ATTR_STATE = new
PropertyDescriptor.Builder()
+ .name("State")
+ .description("State of service for the event (e.g. ok, warning, or
critical)")
+ .required(false)
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .build();
+
+ public static final PropertyDescriptor ATTR_TIME = new
PropertyDescriptor.Builder()
+ .name("Time")
+ .description("Time for event")
+ .required(false)
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor ATTR_HOST = new
PropertyDescriptor.Builder()
+ .name("Host")
+ .description("Name of host for the event")
+ .required(false)
+ .defaultValue("${hostname()}")
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .build();
+
+ public static final PropertyDescriptor ATTR_TTL = new
PropertyDescriptor.Builder()
+ .name("TTL")
+ .description("Time to live for the event")
+ .required(false)
+ .addValidator(Validator.VALID)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor ATTR_METRIC = new
PropertyDescriptor.Builder()
+ .name("Metric")
+ .description("Metric for the event")
+ .required(false)
+ .addValidator(Validator.VALID)
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor ATTR_DESCRIPTION = new
PropertyDescriptor.Builder()
+ .name("Description")
+ .description("Description for the event")
+ .required(false)
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .build();
+
+
+ public static final PropertyDescriptor ATTR_TAGS = new
PropertyDescriptor.Builder()
+ .name("Tags")
+ .description("Comma separated list of tags for the event")
+ .required(false)
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .build();
+
+ public static final PropertyDescriptor TIMEOUT = new
PropertyDescriptor.Builder()
+ .name("Timeout")
+ .description("Timeout in milliseconds when writing events to Riemann")
+ .required(true)
+ .defaultValue("1000")
+ .addValidator(StandardValidators.POSITIVE_LONG_VALIDATOR)
+ .build();
+
+ private List<PropertyDescriptor> customAttributes = new ArrayList<>();
+ private static final Set<Relationship> relationships = new HashSet<>();
+ private static final List<PropertyDescriptor> localProperties = new
ArrayList<>();
+
+ private int batchSize = -1;
+ private long writeTimeout = 1000;
+
+ static {
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ localProperties.add(RIEMANN_HOST);
+ localProperties.add(RIEMANN_PORT);
+ localProperties.add(TRANSPORT_PROTOCOL);
+ localProperties.add(TIMEOUT);
+ localProperties.add(BATCH_SIZE);
+ localProperties.add(ATTR_DESCRIPTION);
+ localProperties.add(ATTR_SERVICE);
+ localProperties.add(ATTR_STATE);
+ localProperties.add(ATTR_METRIC);
+ localProperties.add(ATTR_TTL);
+ localProperties.add(ATTR_TAGS);
+ localProperties.add(ATTR_HOST);
+ localProperties.add(ATTR_TIME);
+ }
+
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return relationships;
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return localProperties;
+ }
+
+ @Override
+ protected PropertyDescriptor getSupportedDynamicPropertyDescriptor(final
String propertyDescriptorName) {
+ return new PropertyDescriptor.Builder()
+ .name(propertyDescriptorName)
+ .expressionLanguageSupported(true)
+ .addValidator(Validator.VALID)
+ .required(false)
+ .dynamic(true)
+ .build();
+ }
+
+ @OnStopped
+ public final void cleanUpClient() {
+ if (riemannClient != null) {
+ this.riemannClient.close();
+ }
+ this.riemannClient = null;
+ this.batchSize = -1;
+ this.customAttributes.clear();
+ }
+
+ @OnScheduled
+ public void onScheduled(ProcessContext context) throws ProcessException {
+ if (batchSize == -1) {
+ batchSize = context.getProperty(BATCH_SIZE).asInteger();
+ }
+ if (riemannClient == null || !riemannClient.isConnected()) {
+ transport =
Transport.valueOf(context.getProperty(TRANSPORT_PROTOCOL).getValue());
+ String host = context.getProperty(RIEMANN_HOST).getValue().trim();
+ int port = context.getProperty(RIEMANN_PORT).asInteger();
+ writeTimeout = context.getProperty(TIMEOUT).asLong();
+ RiemannClient client = null;
+ try {
+ switch (transport) {
+ case TCP:
+ client = RiemannClient.tcp(host, port);
+ break;
+ case UDP:
+ client = RiemannClient.udp(host, port);
+ break;
+ }
+ client.connect();
+ riemannClient = client;
+ } catch (IOException e) {
+ context.yield();
+ throw new ProcessException(String.format("Unable to connect to
Riemann [%s:%d] (%s)\n%s", host, port, transport, e.getMessage()));
+ }
+ }
+
+ if (customAttributes.size() == 0) {
+ for (Map.Entry<PropertyDescriptor, String> property :
context.getProperties().entrySet()) {
+ // only custom defined properties
+ if
(!getSupportedPropertyDescriptors().contains(property.getKey())) {
+ customAttributes.add(property.getKey());
+ }
+ }
+ }
+ }
+
+
+ @Override
+ public void onTrigger(ProcessContext context, ProcessSession session)
throws ProcessException {
+ // Check if the client is currently connected, as a previous trigger
could have detected a failure
+ // in the connection.
+ if (riemannClient == null || !riemannClient.isConnected()) {
+ // clean up the client and attempt to re-initialize the processor
+ cleanUpClient();
+ onScheduled(context);
+ }
+
+ List<FlowFile> incomingFlowFiles = session.get(batchSize);
+ List<FlowFile> successfulFlowFiles = new
ArrayList<>(incomingFlowFiles.size());
+ List<Event> eventsQueue = new ArrayList<>(incomingFlowFiles.size());
+ for (FlowFile flowFile : incomingFlowFiles) {
+ try {
+ eventsQueue.add(FlowFileToEvent.fromAttributes(context,
customAttributes, flowFile));
+ successfulFlowFiles.add(flowFile);
+ } catch (NumberFormatException e) {
+ getLogger().warn(e.getMessage());
+ session.transfer(flowFile, REL_FAILURE);
+ }
+ }
+ try {
+ if (transport == Transport.TCP) {
+ Proto.Msg returnMessage =
riemannClient.sendEvents(eventsQueue).deref(writeTimeout,
TimeUnit.MILLISECONDS);
+ if (returnMessage == null) {
+ context.yield();
+ throw new ProcessException("Timed out writing to Riemann!");
--- End diff --
What are your thoughts on routing these to failure or perhaps even another
relationship in terms of making communication? Would give users more
flexibility in handling differing circumstances in lieu of just kicking it back
to source connection.
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