Github user mattyb149 commented on a diff in the pull request: https://github.com/apache/nifi/pull/1662#discussion_r124123922 --- Diff: nifi-nar-bundles/nifi-groovyx-bundle/nifi-groovyx-processors/src/main/java/org/apache/nifi/processors/groovyx/ExecuteGroovyScript.java --- @@ -0,0 +1,468 @@ +/* + * 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.groovyx; + +import java.io.File; +import java.lang.reflect.Method; +import java.sql.SQLException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Collection; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; + +import org.apache.nifi.annotation.behavior.Restricted; +import org.apache.nifi.annotation.behavior.DynamicProperty; +import org.apache.nifi.annotation.behavior.EventDriven; +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.annotation.lifecycle.OnStopped; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.controller.ControllerService; +import org.apache.nifi.dbcp.DBCPService; +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.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.util.StandardValidators; +import org.codehaus.groovy.control.CompilerConfiguration; +import org.codehaus.groovy.runtime.ResourceGroovyMethods; +import org.codehaus.groovy.runtime.StackTraceUtils; + +import org.apache.nifi.processors.groovyx.sql.OSql; +import org.apache.nifi.processors.groovyx.util.Files; +import org.apache.nifi.processors.groovyx.util.Validators; +import org.apache.nifi.processors.groovyx.flow.GroovyProcessSessionWrap; + +import groovy.lang.GroovyShell; +import groovy.lang.Script; + +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.components.ValidationContext; + +@EventDriven +@Tags({"script", "groovy", "groovyx"}) +@CapabilityDescription( + "Experimental Extended Groovy script processor. The script is responsible for " + + "handling the incoming flow file (transfer to SUCCESS or remove, e.g.) as well as any flow files created by " + + "the script. If the handling is incomplete or incorrect, the session will be rolled back.") +@Restricted("Provides operator the ability to execute arbitrary code assuming all permissions that NiFi has.") +@SeeAlso({}) +@DynamicProperty(name = "A script engine property to update", + value = "The value to set it to", + supportsExpressionLanguage = true, + description = "Updates a script engine property specified by the Dynamic Property's key with the value " + + "specified by the Dynamic Property's value. Use `CTL.` to access any controller services.") +public class ExecuteGroovyScript extends AbstractProcessor { + public static final String GROOVY_CLASSPATH = "${groovy.classes.path}"; + + private static final String PRELOADS = "import org.apache.nifi.components.*;" + "import org.apache.nifi.flowfile.FlowFile;" + "import org.apache.nifi.processor.*;" + + "import org.apache.nifi.processor.FlowFileFilter.FlowFileFilterResult;" + "import org.apache.nifi.processor.exception.*;" + "import org.apache.nifi.processor.io.*;" + + "import org.apache.nifi.processor.util.*;" + "import org.apache.nifi.processors.script.*;" + "import org.apache.nifi.logging.ComponentLog;"; + + public static final PropertyDescriptor SCRIPT_FILE = new PropertyDescriptor.Builder().name("Script File").required(false) + .description("Path to script file to execute. Only one of Script File or Script Body may be used").addValidator(Validators.createFileExistsAndReadableValidator()) + .expressionLanguageSupported(true).build(); + + public static final PropertyDescriptor SCRIPT_BODY = new PropertyDescriptor.Builder().name("Script Body").required(false) + .description("Body of script to execute. Only one of Script File or Script Body may be used").addValidator(StandardValidators.NON_EMPTY_VALIDATOR).expressionLanguageSupported(false) + .build(); + + public static String[] VALID_BOOLEANS = {"true", "false"}; + public static final PropertyDescriptor REQUIRE_FLOW = new PropertyDescriptor.Builder().name("Requires flow file") --- End diff -- I see the benefit of saving the user the trouble of the following boilerplate: ``` def flowFile = session.get() if(!flowFile) return ``` However there are other methods on ProcessSession that might be helpful to the user, for example getting a batch of flow files (if available): ``` def flowFiles = session.get(100) if(!flowFiles) return flowFiles.each { flowFile -> // do something } ``` or applying a filter (I see GroovyProcessSessionWrap has a handy get(Closure) override but it is unused). For the small amount of boilerplate code, I'm not sure such a property is necessary. Thoughts?
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