markobean commented on code in PR #9685: URL: https://github.com/apache/nifi/pull/9685#discussion_r1943257404
########## nifi-extension-bundles/nifi-standard-bundle/nifi-standard-rules/src/main/java/org/apache/nifi/flowanalysis/rules/RestrictLoadBalancing.java: ########## @@ -0,0 +1,266 @@ +/* + * 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.flowanalysis.rules; + +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.ValidationContext; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.controller.queue.LoadBalanceCompression; +import org.apache.nifi.controller.queue.LoadBalanceStrategy; +import org.apache.nifi.flow.VersionedProcessGroup; +import org.apache.nifi.flowanalysis.AbstractFlowAnalysisRule; +import org.apache.nifi.flowanalysis.FlowAnalysisRuleContext; +import org.apache.nifi.flowanalysis.GroupAnalysisResult; +import org.apache.nifi.flowanalysis.rules.util.ConnectionViolation; +import org.apache.nifi.flowanalysis.rules.util.FlowAnalysisRuleUtils; +import org.apache.nifi.flowanalysis.rules.util.ViolationType; +import org.apache.nifi.processor.util.StandardValidators; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.List; + +@Tags({"connection", "load", "balance", "strategy", "compression"}) +@CapabilityDescription("This rule generates a violation when the Load Balance Strategy setting of a connection is set to a strategy which is not allowed. " + + "This rule may be useful for preventing certain strategy types or load-balancing compression. It may be implemented to assist in locating " + + "all connections which have load balancing enabled.") +public class RestrictLoadBalancing extends AbstractFlowAnalysisRule { + + static final String CONFIGURE_STRATEGY_ERROR_MESSAGE = "at least one load balance strategy property must be set to 'true'"; + static final String COMPRESSION_CONFIGURATION_ERROR_MESSAGE = + "there is no compression configuration for content only without including attributes. If content compression is allowed, attribute compression must also be allowed."; + + public static final PropertyDescriptor ALLOW_DO_NOT_LOAD_BALANCE = new PropertyDescriptor.Builder() + .name("Allow 'Do not load balance' Strategy") + .description("If set to true, connections may be configured with the load balancing strategy of 'Do not load balance'. This is the default " + + "setting for new connections.") + .required(true) + .allowableValues("true", "false") + .defaultValue("true") + .addValidator(StandardValidators.BOOLEAN_VALIDATOR) + .build(); + + public static final PropertyDescriptor ALLOW_PARTITION = new PropertyDescriptor.Builder() + .name("Allow 'Partition by attribute' Strategy") + .description("If set to true, connections may be configured with the load balancing strategy of 'Partition by attribute'.") + .required(true) + .allowableValues("true", "false") + .defaultValue("false") + .addValidator(StandardValidators.BOOLEAN_VALIDATOR) + .build(); + + public static final PropertyDescriptor ALLOW_ROUND_ROBIN = new PropertyDescriptor.Builder() + .name("Allow 'Round robin' Strategy") + .description("If set to true, connections may be configured with the load balancing strategy of 'Round robin'.") + .required(true) + .allowableValues("true", "false") + .defaultValue("false") + .addValidator(StandardValidators.BOOLEAN_VALIDATOR) + .build(); + + public static final PropertyDescriptor ALLOW_SINGLE_NODE = new PropertyDescriptor.Builder() + .name("Allow 'Single node' Strategy") + .description("If set to true, connections may be configured with the load balancing strategy of 'Single node'.") + .required(true) + .allowableValues("true", "false") + .defaultValue("false") + .addValidator(StandardValidators.BOOLEAN_VALIDATOR) + .build(); + + public static final PropertyDescriptor ALLOW_ATTRIBUTE_COMPRESSION = new PropertyDescriptor.Builder() + .name("Allow Attribute Compression") + .description("If set to true, connections which are configured to load balance may compress attributes. " + + "This property is ignored if the only allowed Load Balance Strategy is 'Do not load balance'.") + .required(false) + .allowableValues("true", "false") + .defaultValue("true") + .addValidator(StandardValidators.BOOLEAN_VALIDATOR) + .build(); + public static final PropertyDescriptor ALLOW_CONTENT_COMPRESSION = new PropertyDescriptor.Builder() + .name("Allow Content Compression") + .description("If set to true, connections which are configured to load balance may compress attributes and content. " + + "This property is ignored if the only allowed Load Balance Strategy is 'Do not load balance'. " + + "When set to true, 'Allow Attribute Compression' must also be set to true") + .required(false) + .allowableValues("true", "false") + .defaultValue("true") + .addValidator(StandardValidators.BOOLEAN_VALIDATOR) + .build(); + + private static final List<PropertyDescriptor> PROPERTY_DESCRIPTORS = List.of( + ALLOW_DO_NOT_LOAD_BALANCE, + ALLOW_PARTITION, + ALLOW_ROUND_ROBIN, + ALLOW_SINGLE_NODE, + ALLOW_ATTRIBUTE_COMPRESSION, + ALLOW_CONTENT_COMPRESSION + ); + + @Override + protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return PROPERTY_DESCRIPTORS; + } + + @Override + protected Collection<ValidationResult> customValidate(ValidationContext validationContext) { + final List<ValidationResult> results = new ArrayList<>(); + + // For this flow analysis rule to be valid, at least one load balancing strategy must be allowed + if (!validationContext.getProperty(ALLOW_DO_NOT_LOAD_BALANCE).asBoolean() + && !isLoadBalancingAllowed(validationContext)) { + results.add(new ValidationResult.Builder() + .subject("Load Balance Strategy Properties") + .valid(false) + .explanation(CONFIGURE_STRATEGY_ERROR_MESSAGE) + .build()); + } Review Comment: As recommended, a policy property was added in the recent refactor. -- This is an automated message from the Apache Git Service. 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