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Posted to issues@nifi.apache.org by GitBox <gi...@apache.org> on 2022/01/04 20:26:50 UTC
[GitHub] [nifi] markap14 commented on a change in pull request #5597: NIFI-8165 add record path support for message key
markap14 commented on a change in pull request #5597:
URL: https://github.com/apache/nifi/pull/5597#discussion_r778352372
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/MessageKeyResolvers.java
##########
@@ -0,0 +1,79 @@
+/*
+ * 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.kafka.pubsub;
+
+import org.apache.nifi.components.PropertyValue;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.record.path.RecordPath;
+import org.apache.nifi.record.path.RecordPathResult;
+import org.apache.nifi.record.path.util.RecordPathCache;
+import org.apache.nifi.serialization.record.Record;
+
+import java.util.Optional;
+
+/**
+ * Collection of implementation of message key resolvers.
+ *
+ * Message key resolvers specify how to obtain a Kafka message key for a given message.
+ */
+final public class MessageKeyResolvers {
+
+ private MessageKeyResolvers() {
+ }
+
+ /**
+ * {@link MessageKeyResolver} that provides the previously existing functionality of treating the value of
+ * the message key field as the name of a property in the (flat) value record.
+ * The value of this property is extracted and returned as a String.
+ * <P/>
+ * <B>Note:</B> Nested properties are not supported!
+ */
+ public static MessageKeyResolver MESSAGE_VALUE_PROPERTY_RESOLVER = (flowFile, record, messageKeyField) ->
Review comment:
Not sure that the name `MESSAGE_VALUE_PROPERTY_RESOLVER` is really clear as to what this is doing. Perhaps just call it `STRING_FIELD_RESOLVER`?
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/MessageKeyResolvers.java
##########
@@ -0,0 +1,79 @@
+/*
+ * 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.kafka.pubsub;
+
+import org.apache.nifi.components.PropertyValue;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.record.path.RecordPath;
+import org.apache.nifi.record.path.RecordPathResult;
+import org.apache.nifi.record.path.util.RecordPathCache;
+import org.apache.nifi.serialization.record.Record;
+
+import java.util.Optional;
+
+/**
+ * Collection of implementation of message key resolvers.
+ *
+ * Message key resolvers specify how to obtain a Kafka message key for a given message.
+ */
+final public class MessageKeyResolvers {
+
+ private MessageKeyResolvers() {
+ }
+
+ /**
+ * {@link MessageKeyResolver} that provides the previously existing functionality of treating the value of
+ * the message key field as the name of a property in the (flat) value record.
+ * The value of this property is extracted and returned as a String.
+ * <P/>
+ * <B>Note:</B> Nested properties are not supported!
+ */
+ public static MessageKeyResolver MESSAGE_VALUE_PROPERTY_RESOLVER = (flowFile, record, messageKeyField) ->
+ record.getAsString(messageKeyField.getValue());
+
+ /**
+ * {@link MessageKeyResolver} that treats the value of the message key field as a {@link RecordPath} into
+ * the value record. The value of this property is extracted and returned as a String.
+ * <P/>
+ * <pre>
+ * Example:
+ * message key field config value = '/address/zip'
+ * value record =
+ * {
+ * "id": "10",
+ * "address": {
+ * "zip": "8804"
+ * }
+ * }
+ * resulting message key = "8804"
+ * </pre>
+ */
+ public static MessageKeyResolver RECORD_PATH_RESOLVER_FACTORY(RecordPathCache recordPathCache) {
Review comment:
This is a method so should not be in upper case. Recommend just calling it `createRecordPathResolver`?
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/test/java/org/apache/nifi/processors/kafka/pubsub/TestPublishKafkaRecord_2_6.java
##########
@@ -364,6 +369,98 @@ public Object answer(final InvocationOnMock invocationOnMock) throws Throwable {
assertEquals(partitionsForAge48.get(0), partitionsForAge48.get(1));
}
+ @Test
+ public void testMessagePropertyKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.MESSAGE_PROPERTY_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
+ attributes.put("my.key", myAttributeValue);
+
+ doRunWithAttributes(attributes);
+
+ verify(mockLease, times(1)).publish(any(FlowFile.class), any(RecordSet.class), any(RecordSetWriterFactory.class),
+ nullable(RecordSchema.class), argThat(new PropertyValueMatcher(myAttributeValue)), any(String.class), nullable(Function.class), eq(MessageKeyResolvers.MESSAGE_VALUE_PROPERTY_RESOLVER));
+ }
+
+ @Test
+ public void testSimpleValueKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.SIMPLE_VALUE_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
Review comment:
Should probably be `final Map<String, String>`
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/MessageKeyResolvers.java
##########
@@ -0,0 +1,79 @@
+/*
+ * 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.kafka.pubsub;
+
+import org.apache.nifi.components.PropertyValue;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.record.path.RecordPath;
+import org.apache.nifi.record.path.RecordPathResult;
+import org.apache.nifi.record.path.util.RecordPathCache;
+import org.apache.nifi.serialization.record.Record;
+
+import java.util.Optional;
+
+/**
+ * Collection of implementation of message key resolvers.
+ *
+ * Message key resolvers specify how to obtain a Kafka message key for a given message.
+ */
+final public class MessageKeyResolvers {
+
+ private MessageKeyResolvers() {
+ }
+
+ /**
+ * {@link MessageKeyResolver} that provides the previously existing functionality of treating the value of
+ * the message key field as the name of a property in the (flat) value record.
+ * The value of this property is extracted and returned as a String.
+ * <P/>
+ * <B>Note:</B> Nested properties are not supported!
+ */
+ public static MessageKeyResolver MESSAGE_VALUE_PROPERTY_RESOLVER = (flowFile, record, messageKeyField) ->
+ record.getAsString(messageKeyField.getValue());
+
+ /**
+ * {@link MessageKeyResolver} that treats the value of the message key field as a {@link RecordPath} into
+ * the value record. The value of this property is extracted and returned as a String.
+ * <P/>
+ * <pre>
+ * Example:
+ * message key field config value = '/address/zip'
+ * value record =
+ * {
+ * "id": "10",
+ * "address": {
+ * "zip": "8804"
+ * }
+ * }
+ * resulting message key = "8804"
+ * </pre>
+ */
+ public static MessageKeyResolver RECORD_PATH_RESOLVER_FACTORY(RecordPathCache recordPathCache) {
+ return (FlowFile flowFile, Record record, PropertyValue messageKeyField) -> {
+ final RecordPathResult result = recordPathCache.getCompiled(messageKeyField.getValue()).evaluate(record);
+ return result.getSelectedFields().findFirst().flatMap( v -> Optional.ofNullable(v.getValue()))
+ .map(Object::toString).orElse(null);
+ };
+ }
+
+ /**
+ * {@link MessageKeyResolver} that treats the value of the message key field as message key to use. It could refer to
+ * existing flow file attributes, e.g. {@code ${kafka.key}} if processing and publishing a record that has been
+ * consumed from Kafka.
+ */
+ public static MessageKeyResolver SIMPLE_VALUE_RESOLVER = (flowFile, record, messageKeyField) -> messageKeyField.getValue();
Review comment:
Would also recommend calling this `PropertyValueResolver` as that's what it's really doing, is simply evaluating the property value.
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/PublishKafkaRecord_2_6.java
##########
@@ -124,6 +125,14 @@
"Interprets the <Partition> property as Expression Language that will be evaluated against each FlowFile. This Expression will be evaluated once against the FlowFile, " +
"so all Records in a given FlowFile will go to the same partition.");
+ static final AllowableValue MESSAGE_PROPERTY_KEY_RESOLVER_SELECTION = new AllowableValue("MessageValuePropertyResolver",
Review comment:
Rather than a naming convention of MessageValuePropertyResolver, RecordPathResolver, etc. remember: this is a user-facing configuration option. So would stick with more natural language: "Use Field in Record", "Use RecordPath", "Use Literal Value" (or "Use Expression Language")
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/test/java/org/apache/nifi/processors/kafka/pubsub/TestPublishKafkaRecord_2_6.java
##########
@@ -364,6 +369,98 @@ public Object answer(final InvocationOnMock invocationOnMock) throws Throwable {
assertEquals(partitionsForAge48.get(0), partitionsForAge48.get(1));
}
+ @Test
+ public void testMessagePropertyKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.MESSAGE_PROPERTY_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
+ attributes.put("my.key", myAttributeValue);
+
+ doRunWithAttributes(attributes);
+
+ verify(mockLease, times(1)).publish(any(FlowFile.class), any(RecordSet.class), any(RecordSetWriterFactory.class),
+ nullable(RecordSchema.class), argThat(new PropertyValueMatcher(myAttributeValue)), any(String.class), nullable(Function.class), eq(MessageKeyResolvers.MESSAGE_VALUE_PROPERTY_RESOLVER));
+ }
+
+ @Test
+ public void testSimpleValueKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.SIMPLE_VALUE_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
+ attributes.put("my.key", myAttributeValue);
+
+ doRunWithAttributes(attributes);
+
+ verify(mockLease, times(1)).publish(any(FlowFile.class), any(RecordSet.class), any(RecordSetWriterFactory.class),
+ nullable(RecordSchema.class), argThat(new PropertyValueMatcher(myAttributeValue)), any(String.class), nullable(Function.class), eq(MessageKeyResolvers.SIMPLE_VALUE_RESOLVER));
+ }
+
+ @Test
+ public void testSimpleValueKeyResolversWithExpressionLanguage() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key:toUpper()}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.SIMPLE_VALUE_KEY_RESOLVER_SELECTION);
+
+ final HashMap<String, String> attributes = new HashMap<>();
Review comment:
Should probably be `final Map<String, String>`
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/test/java/org/apache/nifi/processors/kafka/pubsub/TestPublishKafkaRecord_2_6.java
##########
@@ -364,6 +369,98 @@ public Object answer(final InvocationOnMock invocationOnMock) throws Throwable {
assertEquals(partitionsForAge48.get(0), partitionsForAge48.get(1));
}
+ @Test
+ public void testMessagePropertyKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.MESSAGE_PROPERTY_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
+ attributes.put("my.key", myAttributeValue);
+
+ doRunWithAttributes(attributes);
+
+ verify(mockLease, times(1)).publish(any(FlowFile.class), any(RecordSet.class), any(RecordSetWriterFactory.class),
+ nullable(RecordSchema.class), argThat(new PropertyValueMatcher(myAttributeValue)), any(String.class), nullable(Function.class), eq(MessageKeyResolvers.MESSAGE_VALUE_PROPERTY_RESOLVER));
+ }
+
+ @Test
+ public void testSimpleValueKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.SIMPLE_VALUE_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
+ attributes.put("my.key", myAttributeValue);
+
+ doRunWithAttributes(attributes);
+
+ verify(mockLease, times(1)).publish(any(FlowFile.class), any(RecordSet.class), any(RecordSetWriterFactory.class),
+ nullable(RecordSchema.class), argThat(new PropertyValueMatcher(myAttributeValue)), any(String.class), nullable(Function.class), eq(MessageKeyResolvers.SIMPLE_VALUE_RESOLVER));
+ }
+
+ @Test
+ public void testSimpleValueKeyResolversWithExpressionLanguage() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key:toUpper()}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.SIMPLE_VALUE_KEY_RESOLVER_SELECTION);
+
+ final HashMap<String, String> attributes = new HashMap<>();
+ attributes.put("my.key", "abc");
+
+ doRunWithAttributes(attributes);
+
+ verify(mockLease, times(1)).publish(any(FlowFile.class), any(RecordSet.class), any(RecordSetWriterFactory.class),
+ nullable(RecordSchema.class), argThat(new PropertyValueMatcher("ABC")), any(String.class), nullable(Function.class), eq(MessageKeyResolvers.SIMPLE_VALUE_RESOLVER));
+ }
+
+ @Test
+ public void testRecordPathResolverWithExpresionLanguage() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "/${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.RECORD_PATH_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
Review comment:
Should probably be `final Map<String, String>`
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/test/java/org/apache/nifi/processors/kafka/pubsub/TestPublishKafkaRecord_2_6.java
##########
@@ -364,6 +369,98 @@ public Object answer(final InvocationOnMock invocationOnMock) throws Throwable {
assertEquals(partitionsForAge48.get(0), partitionsForAge48.get(1));
}
+ @Test
+ public void testMessagePropertyKeyResolversWithAttribute() throws IOException {
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_FIELD, "${my.key}");
+ runner.setProperty(PublishKafkaRecord_2_6.MESSAGE_KEY_RESOLVER_STRATEGY, PublishKafkaRecord_2_6.MESSAGE_PROPERTY_KEY_RESOLVER_SELECTION);
+
+ final String myAttributeValue = "abc";
+ final HashMap<String, String> attributes = new HashMap<>();
Review comment:
Should probably be `final Map<String, String>`
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/PublisherLease.java
##########
@@ -221,6 +222,19 @@ void publish(final FlowFile flowFile, final RecordSet recordSet, final RecordSet
}
}
+ private String resolveMessageKeyIdNeeded(MessageKeyResolver keyResolver, FlowFile flowFile, Record record, PropertyValue messageKeyField) {
+ if(keyResolver != null) {
+ final String key = keyResolver.apply(flowFile, record, messageKeyField);
+ if(key != null) {
+ logger.debug("Message key resolved: key={}, messageKeyField={}", key, messageKeyField);
+ return key;
+ } else {
+ logger.warn("Message key resolver configured, but no key resolved! messageKeyField={}, record={}", messageKeyField, record);
Review comment:
I think I would avoid making this a WARN message and just make it DEBUG. I can see a use case where a null value is intended as a key. In this case, logs would be spammed with non-stop WARN logs and the processor may always show bulletins.
##########
File path: nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-2-6-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/PublishKafkaRecord_2_6.java
##########
@@ -124,6 +125,14 @@
"Interprets the <Partition> property as Expression Language that will be evaluated against each FlowFile. This Expression will be evaluated once against the FlowFile, " +
"so all Records in a given FlowFile will go to the same partition.");
+ static final AllowableValue MESSAGE_PROPERTY_KEY_RESOLVER_SELECTION = new AllowableValue("MessageValuePropertyResolver",
+ "MessageValuePropertyResolver", "The <Message Key Field> property will be interpreted as the name of a simple, " +
+ "non-nested property of the message value. This reflects the previously existing behaviour.");
+ static final AllowableValue RECORD_PATH_KEY_RESOLVER_SELECTION = new AllowableValue("RecordPathResolver",
Review comment:
It's probably worth noting here that if the RecordPath matches more than one element, the first one will be chosen. And that the value will be simply converted to a String and is expected to be a primitive value, not an embedded record. I can definitely envision someone expecting to use this with a RecordPath that points to a complex JSON object or a complex Avro record, for instance.
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