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Posted to issues@nifi.apache.org by GitBox <gi...@apache.org> on 2020/07/07 12:57:00 UTC
[GitHub] [nifi] MikeThomsen commented on a change in pull request #4374: NIFI-7572: Added ScriptedTransformRecord processor. Addressed a coupl…
MikeThomsen commented on a change in pull request #4374:
URL: https://github.com/apache/nifi/pull/4374#discussion_r450839641
##########
File path: nifi-nar-bundles/nifi-scripting-bundle/nifi-scripting-processors/src/main/java/org/apache/nifi/processors/script/ScriptedTransformRecord.java
##########
@@ -0,0 +1,398 @@
+/*
+ * 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.script;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.Restricted;
+import org.apache.nifi.annotation.behavior.Restriction;
+import org.apache.nifi.annotation.behavior.SideEffectFree;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.PropertyDescriptor.Builder;
+import org.apache.nifi.components.RequiredPermission;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+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.schema.access.SchemaNotFoundException;
+import org.apache.nifi.script.ScriptingComponentHelper;
+import org.apache.nifi.script.ScriptingComponentUtils;
+import org.apache.nifi.search.SearchContext;
+import org.apache.nifi.search.SearchResult;
+import org.apache.nifi.search.Searchable;
+import org.apache.nifi.serialization.MalformedRecordException;
+import org.apache.nifi.serialization.RecordReader;
+import org.apache.nifi.serialization.RecordReaderFactory;
+import org.apache.nifi.serialization.RecordSetWriter;
+import org.apache.nifi.serialization.RecordSetWriterFactory;
+import org.apache.nifi.serialization.WriteResult;
+import org.apache.nifi.serialization.record.Record;
+import org.python.jsr223.PyScriptEngine;
+
+import javax.script.Bindings;
+import javax.script.CompiledScript;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
+import javax.script.SimpleBindings;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+
+@EventDriven
+@SupportsBatching
+@SideEffectFree
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@Tags({"record", "transform", "script", "groovy", "jython", "python", "update", "modify", "filter"})
+@Restricted(restrictions = {
+ @Restriction(requiredPermission = RequiredPermission.EXECUTE_CODE,
+ explanation = "Provides operator the ability to execute arbitrary code assuming all permissions that NiFi has.")
+})
+@WritesAttributes({
+ @WritesAttribute(attribute = "mime.type", description = "Sets the mime.type attribute to the MIME Type specified by the Record Writer"),
+ @WritesAttribute(attribute = "record.count", description = "The number of records in the FlowFile"),
+ @WritesAttribute(attribute = "record.error.message", description = "This attribute provides on failure the error message encountered by the Reader or Writer.")
+})
+@CapabilityDescription("Provides the ability to evaluate a simple script against each record in an incoming FlowFile. The script may transform the record in some way, filter the record, or fork " +
+ "additional records. See Processor's Additional Details for more information.")
+@SeeAlso(classNames = {"org.apache.nifi.processors.script.ExecuteScript",
+ "org.apache.nifi.processors.standard.UpdateRecord",
+ "org.apache.nifi.processors.standard.QueryRecord",
+ "org.apache.nifi.processors.standard.JoltTransformRecord",
+ "org.apache.nifi.processors.standard.LookupRecord"})
+public class ScriptedTransformRecord extends AbstractProcessor implements Searchable {
+ private static final String PYTHON_SCRIPT_LANGUAGE = "python";
+ private static final Set<String> SCRIPT_OPTIONS = ScriptingComponentUtils.getAvailableEngines();
+
+ static final PropertyDescriptor RECORD_READER = new Builder()
+ .name("Record Reader")
+ .displayName("Record Reader")
+ .description("The Record Reader to use parsing the incoming FlowFile into Records")
+ .required(true)
+ .identifiesControllerService(RecordReaderFactory.class)
+ .build();
+ static final PropertyDescriptor RECORD_WRITER = new Builder()
+ .name("Record Writer")
+ .displayName("Record Writer")
+ .description("The Record Writer to use for serializing Records after they have been transformed")
+ .required(true)
+ .identifiesControllerService(RecordSetWriterFactory.class)
+ .build();
+ static final PropertyDescriptor LANGUAGE = new Builder()
+ .name("Script Engine")
+ .displayName("Script Language")
+ .description("The Language to use for the script")
+ .allowableValues(SCRIPT_OPTIONS)
+ .defaultValue("Groovy")
+ .required(true)
+ .build();
+
+ public static final Relationship REL_SUCCESS = new Relationship.Builder()
+ .name("success")
+ .description("Each FlowFile that were successfully transformed will be routed to this Relationship")
+ .build();
+
+ public static final Relationship REL_FAILURE = new Relationship.Builder()
+ .name("failure")
+ .description("Any FlowFile that cannot be transformed will be routed to this Relationship")
+ .build();
+
+
+ private volatile String scriptToRun = null;
+ private final ScriptingComponentHelper scriptingComponentHelper = new ScriptingComponentHelper();
+ private final List<PropertyDescriptor> descriptors = Arrays.asList(
+ RECORD_READER,
+ RECORD_WRITER,
+ LANGUAGE,
+ ScriptingComponentUtils.SCRIPT_BODY,
+ ScriptingComponentUtils.SCRIPT_FILE,
+ ScriptingComponentUtils.MODULES);
+
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ return Collections.unmodifiableSet(relationships);
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return descriptors;
+ }
+
+ @Override
+ protected Collection<ValidationResult> customValidate(ValidationContext validationContext) {
+ return scriptingComponentHelper.customValidate(validationContext);
+ }
+
+ @OnScheduled
+ public void setup(final ProcessContext context) throws IOException {
+ if (!scriptingComponentHelper.isInitialized.get()) {
+ scriptingComponentHelper.createResources();
+ }
+
+ scriptingComponentHelper.setupVariables(context);
+
+ // Create a script engine for each possible task
+ final int maxTasks = context.getMaxConcurrentTasks();
+ scriptingComponentHelper.setup(maxTasks, getLogger());
+ scriptToRun = scriptingComponentHelper.getScriptBody();
+
+ if (scriptToRun == null && scriptingComponentHelper.getScriptPath() != null) {
+ try (final FileInputStream scriptStream = new FileInputStream(scriptingComponentHelper.getScriptPath())) {
+ scriptToRun = IOUtils.toString(scriptStream, Charset.defaultCharset());
+ }
+ }
+ }
+
+
+ @Override
+ public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
+ final FlowFile flowFile = session.get();
+ if (flowFile == null) {
+ return;
+ }
+
+ final ScriptEngine scriptEngine = scriptingComponentHelper.engineQ.poll();
+ if (scriptEngine == null) {
+ // This shouldn't happen. But just in case.
+ session.rollback();
+ return;
+ }
+
+ try {
+ final ScriptEvaluator evaluator;
+ try {
+ evaluator = createEvaluator(scriptEngine, flowFile);
+ } catch (final ScriptException se) {
+ getLogger().error("Failed to initialize script engine", se);
+ session.transfer(flowFile, REL_FAILURE);
+ return;
+ }
+
+ transform(flowFile, evaluator, context, session);
+ } finally {
+ scriptingComponentHelper.engineQ.offer(scriptEngine);
+ }
+ }
+
+ private void transform(final FlowFile flowFile, final ScriptEvaluator evaluator, final ProcessContext context, final ProcessSession session) {
+ final long startMillis = System.currentTimeMillis();
+
+ final RecordReaderFactory readerFactory = context.getProperty(RECORD_READER).asControllerService(RecordReaderFactory.class);
+ final RecordSetWriterFactory writerFactory = context.getProperty(RECORD_WRITER).asControllerService(RecordSetWriterFactory.class);
+
+ final AtomicLong recordIndex = new AtomicLong(0L);
+ final AtomicLong dropCount = new AtomicLong(0L);
+
+ try {
+ final Map<String, String> attributesToAdd = new HashMap<>();
+
+ // Read each record, transform it, and write out the transformed version
+ session.write(flowFile, (in, out) -> {
+ try (final RecordReader reader = readerFactory.createRecordReader(flowFile, in, getLogger());
+ final RecordSetWriter writer = writerFactory.createWriter(getLogger(), reader.getSchema(), out, flowFile)) {
+
+ writer.beginRecordSet();
+
+ Record inputRecord;
+ while ((inputRecord = reader.nextRecord()) != null) {
+ final long index = recordIndex.get();
+
+ // Evaluate the script against the Record
+ final Object returnValue = evaluator.evaluate(inputRecord, index);
+
+ recordIndex.getAndIncrement();
+
+ // If a null value was returned, drop the Record
+ if (returnValue == null) {
+ getLogger().trace("Script returned null for Record {} [{}] so will drop Record from {}", new Object[]{index, inputRecord, flowFile});
+ dropCount.getAndIncrement();
+ continue;
+ }
+
+ // If a single Record was returned, write it out
+ if (returnValue instanceof Record) {
+ final Record transformedRecord = (Record) returnValue;
+ getLogger().trace("Successfully transformed Record {} from {} to {} for {}", new Object[] {index, inputRecord, transformedRecord, flowFile});
+ writer.write(transformedRecord);
+ continue;
+ }
+
+ // If a Collection was returned, ensure that every element in the collection is a Record and write them out
+ if (returnValue instanceof Collection) {
+ final Collection<?> collection = (Collection<?>) returnValue;
+ getLogger().trace("Successfully transformed Record {} from {} to {} for {}", new Object[] {index, inputRecord, collection, flowFile});
+
+ for (final Object element : collection) {
+ if (!(element instanceof Record)) {
+ throw new RuntimeException("Evaluated script against Record number " + index + " of " + flowFile
+ + " but instead of returning a Record or Collection of Records, script returned a Collection of values, "
+ + "at least one of which was not a Record but instead was: " + returnValue);
Review comment:
```ot a Record but instead was: " + returnValue```
could be
```ot a Record but instead was: " + element.getClass().getName()```
to better show the specific bad value type.
##########
File path: nifi-nar-bundles/nifi-scripting-bundle/nifi-scripting-processors/src/main/java/org/apache/nifi/processors/script/ScriptedTransformRecord.java
##########
@@ -0,0 +1,398 @@
+/*
+ * 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.script;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.Restricted;
+import org.apache.nifi.annotation.behavior.Restriction;
+import org.apache.nifi.annotation.behavior.SideEffectFree;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.PropertyDescriptor.Builder;
+import org.apache.nifi.components.RequiredPermission;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+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.schema.access.SchemaNotFoundException;
+import org.apache.nifi.script.ScriptingComponentHelper;
+import org.apache.nifi.script.ScriptingComponentUtils;
+import org.apache.nifi.search.SearchContext;
+import org.apache.nifi.search.SearchResult;
+import org.apache.nifi.search.Searchable;
+import org.apache.nifi.serialization.MalformedRecordException;
+import org.apache.nifi.serialization.RecordReader;
+import org.apache.nifi.serialization.RecordReaderFactory;
+import org.apache.nifi.serialization.RecordSetWriter;
+import org.apache.nifi.serialization.RecordSetWriterFactory;
+import org.apache.nifi.serialization.WriteResult;
+import org.apache.nifi.serialization.record.Record;
+import org.python.jsr223.PyScriptEngine;
+
+import javax.script.Bindings;
+import javax.script.CompiledScript;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
+import javax.script.SimpleBindings;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+
+@EventDriven
+@SupportsBatching
+@SideEffectFree
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@Tags({"record", "transform", "script", "groovy", "jython", "python", "update", "modify", "filter"})
+@Restricted(restrictions = {
+ @Restriction(requiredPermission = RequiredPermission.EXECUTE_CODE,
+ explanation = "Provides operator the ability to execute arbitrary code assuming all permissions that NiFi has.")
+})
+@WritesAttributes({
+ @WritesAttribute(attribute = "mime.type", description = "Sets the mime.type attribute to the MIME Type specified by the Record Writer"),
+ @WritesAttribute(attribute = "record.count", description = "The number of records in the FlowFile"),
+ @WritesAttribute(attribute = "record.error.message", description = "This attribute provides on failure the error message encountered by the Reader or Writer.")
+})
+@CapabilityDescription("Provides the ability to evaluate a simple script against each record in an incoming FlowFile. The script may transform the record in some way, filter the record, or fork " +
+ "additional records. See Processor's Additional Details for more information.")
+@SeeAlso(classNames = {"org.apache.nifi.processors.script.ExecuteScript",
+ "org.apache.nifi.processors.standard.UpdateRecord",
+ "org.apache.nifi.processors.standard.QueryRecord",
+ "org.apache.nifi.processors.standard.JoltTransformRecord",
+ "org.apache.nifi.processors.standard.LookupRecord"})
+public class ScriptedTransformRecord extends AbstractProcessor implements Searchable {
+ private static final String PYTHON_SCRIPT_LANGUAGE = "python";
+ private static final Set<String> SCRIPT_OPTIONS = ScriptingComponentUtils.getAvailableEngines();
+
+ static final PropertyDescriptor RECORD_READER = new Builder()
+ .name("Record Reader")
+ .displayName("Record Reader")
+ .description("The Record Reader to use parsing the incoming FlowFile into Records")
+ .required(true)
+ .identifiesControllerService(RecordReaderFactory.class)
+ .build();
+ static final PropertyDescriptor RECORD_WRITER = new Builder()
+ .name("Record Writer")
+ .displayName("Record Writer")
+ .description("The Record Writer to use for serializing Records after they have been transformed")
+ .required(true)
+ .identifiesControllerService(RecordSetWriterFactory.class)
+ .build();
+ static final PropertyDescriptor LANGUAGE = new Builder()
+ .name("Script Engine")
+ .displayName("Script Language")
+ .description("The Language to use for the script")
+ .allowableValues(SCRIPT_OPTIONS)
+ .defaultValue("Groovy")
+ .required(true)
+ .build();
+
+ public static final Relationship REL_SUCCESS = new Relationship.Builder()
+ .name("success")
+ .description("Each FlowFile that were successfully transformed will be routed to this Relationship")
+ .build();
+
+ public static final Relationship REL_FAILURE = new Relationship.Builder()
+ .name("failure")
+ .description("Any FlowFile that cannot be transformed will be routed to this Relationship")
+ .build();
+
+
+ private volatile String scriptToRun = null;
+ private final ScriptingComponentHelper scriptingComponentHelper = new ScriptingComponentHelper();
+ private final List<PropertyDescriptor> descriptors = Arrays.asList(
+ RECORD_READER,
+ RECORD_WRITER,
+ LANGUAGE,
+ ScriptingComponentUtils.SCRIPT_BODY,
+ ScriptingComponentUtils.SCRIPT_FILE,
+ ScriptingComponentUtils.MODULES);
+
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ return Collections.unmodifiableSet(relationships);
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return descriptors;
+ }
+
+ @Override
+ protected Collection<ValidationResult> customValidate(ValidationContext validationContext) {
+ return scriptingComponentHelper.customValidate(validationContext);
+ }
+
+ @OnScheduled
+ public void setup(final ProcessContext context) throws IOException {
+ if (!scriptingComponentHelper.isInitialized.get()) {
+ scriptingComponentHelper.createResources();
+ }
+
+ scriptingComponentHelper.setupVariables(context);
+
+ // Create a script engine for each possible task
+ final int maxTasks = context.getMaxConcurrentTasks();
+ scriptingComponentHelper.setup(maxTasks, getLogger());
+ scriptToRun = scriptingComponentHelper.getScriptBody();
+
+ if (scriptToRun == null && scriptingComponentHelper.getScriptPath() != null) {
+ try (final FileInputStream scriptStream = new FileInputStream(scriptingComponentHelper.getScriptPath())) {
+ scriptToRun = IOUtils.toString(scriptStream, Charset.defaultCharset());
+ }
+ }
+ }
+
+
+ @Override
+ public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
+ final FlowFile flowFile = session.get();
+ if (flowFile == null) {
+ return;
+ }
+
+ final ScriptEngine scriptEngine = scriptingComponentHelper.engineQ.poll();
+ if (scriptEngine == null) {
+ // This shouldn't happen. But just in case.
+ session.rollback();
+ return;
+ }
+
+ try {
+ final ScriptEvaluator evaluator;
+ try {
+ evaluator = createEvaluator(scriptEngine, flowFile);
+ } catch (final ScriptException se) {
+ getLogger().error("Failed to initialize script engine", se);
+ session.transfer(flowFile, REL_FAILURE);
+ return;
+ }
+
+ transform(flowFile, evaluator, context, session);
+ } finally {
+ scriptingComponentHelper.engineQ.offer(scriptEngine);
+ }
+ }
+
+ private void transform(final FlowFile flowFile, final ScriptEvaluator evaluator, final ProcessContext context, final ProcessSession session) {
+ final long startMillis = System.currentTimeMillis();
+
+ final RecordReaderFactory readerFactory = context.getProperty(RECORD_READER).asControllerService(RecordReaderFactory.class);
+ final RecordSetWriterFactory writerFactory = context.getProperty(RECORD_WRITER).asControllerService(RecordSetWriterFactory.class);
+
+ final AtomicLong recordIndex = new AtomicLong(0L);
+ final AtomicLong dropCount = new AtomicLong(0L);
+
+ try {
+ final Map<String, String> attributesToAdd = new HashMap<>();
+
+ // Read each record, transform it, and write out the transformed version
+ session.write(flowFile, (in, out) -> {
+ try (final RecordReader reader = readerFactory.createRecordReader(flowFile, in, getLogger());
+ final RecordSetWriter writer = writerFactory.createWriter(getLogger(), reader.getSchema(), out, flowFile)) {
+
+ writer.beginRecordSet();
+
+ Record inputRecord;
+ while ((inputRecord = reader.nextRecord()) != null) {
+ final long index = recordIndex.get();
+
+ // Evaluate the script against the Record
+ final Object returnValue = evaluator.evaluate(inputRecord, index);
+
+ recordIndex.getAndIncrement();
+
+ // If a null value was returned, drop the Record
+ if (returnValue == null) {
+ getLogger().trace("Script returned null for Record {} [{}] so will drop Record from {}", new Object[]{index, inputRecord, flowFile});
+ dropCount.getAndIncrement();
+ continue;
+ }
+
+ // If a single Record was returned, write it out
+ if (returnValue instanceof Record) {
+ final Record transformedRecord = (Record) returnValue;
+ getLogger().trace("Successfully transformed Record {} from {} to {} for {}", new Object[] {index, inputRecord, transformedRecord, flowFile});
+ writer.write(transformedRecord);
+ continue;
+ }
+
+ // If a Collection was returned, ensure that every element in the collection is a Record and write them out
+ if (returnValue instanceof Collection) {
+ final Collection<?> collection = (Collection<?>) returnValue;
+ getLogger().trace("Successfully transformed Record {} from {} to {} for {}", new Object[] {index, inputRecord, collection, flowFile});
+
+ for (final Object element : collection) {
+ if (!(element instanceof Record)) {
+ throw new RuntimeException("Evaluated script against Record number " + index + " of " + flowFile
+ + " but instead of returning a Record or Collection of Records, script returned a Collection of values, "
+ + "at least one of which was not a Record but instead was: " + returnValue);
+ }
+
+ writer.write((Record) element);
+ }
+
+ continue;
+ }
+
+ // Ensure that the value returned from the script is either null or a Record
+ throw new RuntimeException("Evaluated script against Record number " + index + " of " + flowFile
+ + " but instead of returning a Record, script returned a value of: " + returnValue);
+ }
+
+ // Add WriteResults to the attributes to be added to the FlowFile
+ final WriteResult writeResult = writer.finishRecordSet();
+ attributesToAdd.put("mime.type", writer.getMimeType());
+ attributesToAdd.putAll(writeResult.getAttributes());
+ attributesToAdd.put("record.count", String.valueOf(writeResult.getRecordCount()));
+ } catch (final MalformedRecordException | SchemaNotFoundException | ScriptException e) {
+ throw new ProcessException(e);
+ }
+ });
+
+ // Add the necessary attributes to the FlowFile and transfer to success
+ session.putAllAttributes(flowFile, attributesToAdd);
+ session.transfer(flowFile, REL_SUCCESS);
+
+ final long transformCount = recordIndex.get() - dropCount.get();
+ getLogger().info("Successfully transformed {} Records and dropped {} Records for {}", new Object[] {transformCount, dropCount.get(), flowFile});
+ session.adjustCounter("Records Transformed", transformCount, true);
+ session.adjustCounter("Records Dropped", dropCount.get(), true);
+
+ final long millis = System.currentTimeMillis() - startMillis;
+ session.getProvenanceReporter().modifyContent(flowFile, "Transformed " + transformCount + " Records, Dropped " + dropCount.get() + " Records", millis);
+ } catch (final ProcessException e) {
+ getLogger().error("After processing {} Records, encountered failure when attempting to transform {}", new Object[] {recordIndex.get(), flowFile}, e.getCause());
+ session.transfer(flowFile, REL_FAILURE);
+ } catch (final Exception e) {
+ getLogger().error("After processing {} Records, encountered failure when attempting to transform {}", new Object[] {recordIndex.get(), flowFile}, e);
+ session.transfer(flowFile, REL_FAILURE);
+ }
+ }
+
+ private ScriptEvaluator createEvaluator(final ScriptEngine scriptEngine, final FlowFile flowFile) throws ScriptException {
+ if (PYTHON_SCRIPT_LANGUAGE.equalsIgnoreCase(scriptEngine.getFactory().getLanguageName())) {
Review comment:
@mattyb149 we deprecated support for Jython, didn't we, in `ExecuteScript`?
##########
File path: nifi-nar-bundles/nifi-scripting-bundle/nifi-scripting-processors/src/main/java/org/apache/nifi/processors/script/ScriptedTransformRecord.java
##########
@@ -0,0 +1,398 @@
+/*
+ * 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.script;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.Restricted;
+import org.apache.nifi.annotation.behavior.Restriction;
+import org.apache.nifi.annotation.behavior.SideEffectFree;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.PropertyDescriptor.Builder;
+import org.apache.nifi.components.RequiredPermission;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+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.schema.access.SchemaNotFoundException;
+import org.apache.nifi.script.ScriptingComponentHelper;
+import org.apache.nifi.script.ScriptingComponentUtils;
+import org.apache.nifi.search.SearchContext;
+import org.apache.nifi.search.SearchResult;
+import org.apache.nifi.search.Searchable;
+import org.apache.nifi.serialization.MalformedRecordException;
+import org.apache.nifi.serialization.RecordReader;
+import org.apache.nifi.serialization.RecordReaderFactory;
+import org.apache.nifi.serialization.RecordSetWriter;
+import org.apache.nifi.serialization.RecordSetWriterFactory;
+import org.apache.nifi.serialization.WriteResult;
+import org.apache.nifi.serialization.record.Record;
+import org.python.jsr223.PyScriptEngine;
+
+import javax.script.Bindings;
+import javax.script.CompiledScript;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
+import javax.script.SimpleBindings;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+
+@EventDriven
+@SupportsBatching
+@SideEffectFree
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@Tags({"record", "transform", "script", "groovy", "jython", "python", "update", "modify", "filter"})
+@Restricted(restrictions = {
+ @Restriction(requiredPermission = RequiredPermission.EXECUTE_CODE,
+ explanation = "Provides operator the ability to execute arbitrary code assuming all permissions that NiFi has.")
+})
+@WritesAttributes({
+ @WritesAttribute(attribute = "mime.type", description = "Sets the mime.type attribute to the MIME Type specified by the Record Writer"),
+ @WritesAttribute(attribute = "record.count", description = "The number of records in the FlowFile"),
+ @WritesAttribute(attribute = "record.error.message", description = "This attribute provides on failure the error message encountered by the Reader or Writer.")
+})
+@CapabilityDescription("Provides the ability to evaluate a simple script against each record in an incoming FlowFile. The script may transform the record in some way, filter the record, or fork " +
+ "additional records. See Processor's Additional Details for more information.")
+@SeeAlso(classNames = {"org.apache.nifi.processors.script.ExecuteScript",
+ "org.apache.nifi.processors.standard.UpdateRecord",
+ "org.apache.nifi.processors.standard.QueryRecord",
+ "org.apache.nifi.processors.standard.JoltTransformRecord",
+ "org.apache.nifi.processors.standard.LookupRecord"})
+public class ScriptedTransformRecord extends AbstractProcessor implements Searchable {
+ private static final String PYTHON_SCRIPT_LANGUAGE = "python";
+ private static final Set<String> SCRIPT_OPTIONS = ScriptingComponentUtils.getAvailableEngines();
+
+ static final PropertyDescriptor RECORD_READER = new Builder()
+ .name("Record Reader")
+ .displayName("Record Reader")
+ .description("The Record Reader to use parsing the incoming FlowFile into Records")
+ .required(true)
+ .identifiesControllerService(RecordReaderFactory.class)
+ .build();
+ static final PropertyDescriptor RECORD_WRITER = new Builder()
+ .name("Record Writer")
+ .displayName("Record Writer")
+ .description("The Record Writer to use for serializing Records after they have been transformed")
+ .required(true)
+ .identifiesControllerService(RecordSetWriterFactory.class)
+ .build();
+ static final PropertyDescriptor LANGUAGE = new Builder()
+ .name("Script Engine")
+ .displayName("Script Language")
+ .description("The Language to use for the script")
+ .allowableValues(SCRIPT_OPTIONS)
+ .defaultValue("Groovy")
+ .required(true)
+ .build();
+
+ public static final Relationship REL_SUCCESS = new Relationship.Builder()
+ .name("success")
+ .description("Each FlowFile that were successfully transformed will be routed to this Relationship")
+ .build();
+
+ public static final Relationship REL_FAILURE = new Relationship.Builder()
+ .name("failure")
+ .description("Any FlowFile that cannot be transformed will be routed to this Relationship")
+ .build();
+
+
+ private volatile String scriptToRun = null;
+ private final ScriptingComponentHelper scriptingComponentHelper = new ScriptingComponentHelper();
+ private final List<PropertyDescriptor> descriptors = Arrays.asList(
+ RECORD_READER,
+ RECORD_WRITER,
+ LANGUAGE,
+ ScriptingComponentUtils.SCRIPT_BODY,
+ ScriptingComponentUtils.SCRIPT_FILE,
+ ScriptingComponentUtils.MODULES);
+
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ return Collections.unmodifiableSet(relationships);
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return descriptors;
+ }
+
+ @Override
+ protected Collection<ValidationResult> customValidate(ValidationContext validationContext) {
+ return scriptingComponentHelper.customValidate(validationContext);
+ }
+
+ @OnScheduled
+ public void setup(final ProcessContext context) throws IOException {
+ if (!scriptingComponentHelper.isInitialized.get()) {
+ scriptingComponentHelper.createResources();
+ }
+
+ scriptingComponentHelper.setupVariables(context);
+
+ // Create a script engine for each possible task
+ final int maxTasks = context.getMaxConcurrentTasks();
+ scriptingComponentHelper.setup(maxTasks, getLogger());
+ scriptToRun = scriptingComponentHelper.getScriptBody();
+
+ if (scriptToRun == null && scriptingComponentHelper.getScriptPath() != null) {
+ try (final FileInputStream scriptStream = new FileInputStream(scriptingComponentHelper.getScriptPath())) {
+ scriptToRun = IOUtils.toString(scriptStream, Charset.defaultCharset());
+ }
+ }
+ }
+
+
+ @Override
+ public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
+ final FlowFile flowFile = session.get();
+ if (flowFile == null) {
+ return;
+ }
+
+ final ScriptEngine scriptEngine = scriptingComponentHelper.engineQ.poll();
+ if (scriptEngine == null) {
+ // This shouldn't happen. But just in case.
+ session.rollback();
+ return;
+ }
+
+ try {
+ final ScriptEvaluator evaluator;
+ try {
+ evaluator = createEvaluator(scriptEngine, flowFile);
+ } catch (final ScriptException se) {
+ getLogger().error("Failed to initialize script engine", se);
+ session.transfer(flowFile, REL_FAILURE);
+ return;
+ }
+
+ transform(flowFile, evaluator, context, session);
+ } finally {
+ scriptingComponentHelper.engineQ.offer(scriptEngine);
+ }
+ }
+
+ private void transform(final FlowFile flowFile, final ScriptEvaluator evaluator, final ProcessContext context, final ProcessSession session) {
+ final long startMillis = System.currentTimeMillis();
+
+ final RecordReaderFactory readerFactory = context.getProperty(RECORD_READER).asControllerService(RecordReaderFactory.class);
+ final RecordSetWriterFactory writerFactory = context.getProperty(RECORD_WRITER).asControllerService(RecordSetWriterFactory.class);
+
+ final AtomicLong recordIndex = new AtomicLong(0L);
+ final AtomicLong dropCount = new AtomicLong(0L);
+
+ try {
+ final Map<String, String> attributesToAdd = new HashMap<>();
+
+ // Read each record, transform it, and write out the transformed version
+ session.write(flowFile, (in, out) -> {
+ try (final RecordReader reader = readerFactory.createRecordReader(flowFile, in, getLogger());
+ final RecordSetWriter writer = writerFactory.createWriter(getLogger(), reader.getSchema(), out, flowFile)) {
+
+ writer.beginRecordSet();
+
+ Record inputRecord;
+ while ((inputRecord = reader.nextRecord()) != null) {
+ final long index = recordIndex.get();
+
+ // Evaluate the script against the Record
+ final Object returnValue = evaluator.evaluate(inputRecord, index);
+
+ recordIndex.getAndIncrement();
+
+ // If a null value was returned, drop the Record
+ if (returnValue == null) {
+ getLogger().trace("Script returned null for Record {} [{}] so will drop Record from {}", new Object[]{index, inputRecord, flowFile});
+ dropCount.getAndIncrement();
+ continue;
+ }
+
+ // If a single Record was returned, write it out
+ if (returnValue instanceof Record) {
+ final Record transformedRecord = (Record) returnValue;
+ getLogger().trace("Successfully transformed Record {} from {} to {} for {}", new Object[] {index, inputRecord, transformedRecord, flowFile});
+ writer.write(transformedRecord);
+ continue;
+ }
+
+ // If a Collection was returned, ensure that every element in the collection is a Record and write them out
+ if (returnValue instanceof Collection) {
+ final Collection<?> collection = (Collection<?>) returnValue;
+ getLogger().trace("Successfully transformed Record {} from {} to {} for {}", new Object[] {index, inputRecord, collection, flowFile});
+
+ for (final Object element : collection) {
+ if (!(element instanceof Record)) {
+ throw new RuntimeException("Evaluated script against Record number " + index + " of " + flowFile
+ + " but instead of returning a Record or Collection of Records, script returned a Collection of values, "
+ + "at least one of which was not a Record but instead was: " + returnValue);
+ }
+
+ writer.write((Record) element);
+ }
+
+ continue;
+ }
+
+ // Ensure that the value returned from the script is either null or a Record
+ throw new RuntimeException("Evaluated script against Record number " + index + " of " + flowFile
+ + " but instead of returning a Record, script returned a value of: " + returnValue);
+ }
+
+ // Add WriteResults to the attributes to be added to the FlowFile
+ final WriteResult writeResult = writer.finishRecordSet();
+ attributesToAdd.put("mime.type", writer.getMimeType());
+ attributesToAdd.putAll(writeResult.getAttributes());
+ attributesToAdd.put("record.count", String.valueOf(writeResult.getRecordCount()));
+ } catch (final MalformedRecordException | SchemaNotFoundException | ScriptException e) {
+ throw new ProcessException(e);
+ }
+ });
+
+ // Add the necessary attributes to the FlowFile and transfer to success
+ session.putAllAttributes(flowFile, attributesToAdd);
+ session.transfer(flowFile, REL_SUCCESS);
+
+ final long transformCount = recordIndex.get() - dropCount.get();
+ getLogger().info("Successfully transformed {} Records and dropped {} Records for {}", new Object[] {transformCount, dropCount.get(), flowFile});
+ session.adjustCounter("Records Transformed", transformCount, true);
+ session.adjustCounter("Records Dropped", dropCount.get(), true);
+
+ final long millis = System.currentTimeMillis() - startMillis;
+ session.getProvenanceReporter().modifyContent(flowFile, "Transformed " + transformCount + " Records, Dropped " + dropCount.get() + " Records", millis);
+ } catch (final ProcessException e) {
+ getLogger().error("After processing {} Records, encountered failure when attempting to transform {}", new Object[] {recordIndex.get(), flowFile}, e.getCause());
+ session.transfer(flowFile, REL_FAILURE);
+ } catch (final Exception e) {
+ getLogger().error("After processing {} Records, encountered failure when attempting to transform {}", new Object[] {recordIndex.get(), flowFile}, e);
+ session.transfer(flowFile, REL_FAILURE);
+ }
+ }
+
+ private ScriptEvaluator createEvaluator(final ScriptEngine scriptEngine, final FlowFile flowFile) throws ScriptException {
+ if (PYTHON_SCRIPT_LANGUAGE.equalsIgnoreCase(scriptEngine.getFactory().getLanguageName())) {
+ return new PythonScriptEvaluator(scriptEngine, scriptToRun, flowFile);
+ }
+
+ return new DefaultScriptEvaluator(scriptEngine, scriptToRun, flowFile);
+ }
+
+ private static Bindings setupBindings(final ScriptEngine scriptEngine) {
+ Bindings bindings = scriptEngine.getBindings(ScriptContext.ENGINE_SCOPE);
+ if (bindings == null) {
+ bindings = new SimpleBindings();
+ }
+
+ scriptEngine.setBindings(bindings, ScriptContext.ENGINE_SCOPE);
+
+ return bindings;
+ }
+
+
+ @Override
+ public Collection<SearchResult> search(final SearchContext context) {
+ return ScriptingComponentUtils.search(context, getLogger());
+ }
+
+ private interface ScriptEvaluator {
+ Object evaluate(Record record, long index) throws ScriptException;
+ }
+
+
+ private class PythonScriptEvaluator implements ScriptEvaluator {
Review comment:
@markap14 curious why we're not pre-compiling Groovy and other languages as well.
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