adamdebreceni commented on a change in pull request #1137: URL: https://github.com/apache/nifi-minifi-cpp/pull/1137#discussion_r689607875
########## File path: extensions/standard-processors/processors/AttributesToJSON.cpp ########## @@ -0,0 +1,174 @@ +/** + * @file AttributesToJSON.cpp + * AttributesToJSON class implementation + * + * 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. + */ +#include "AttributesToJSON.h" + +#include <unordered_set> + +#include "rapidjson/writer.h" +#include "utils/StringUtils.h" +#include "utils/ProcessorConfigUtils.h" + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace processors { + +const core::Property AttributesToJSON::AttributesList( + core::PropertyBuilder::createProperty("Attributes List") + ->withDescription("Comma separated list of attributes to be included in the resulting JSON. " + "If this value is left empty then all existing Attributes will be included. This list of attributes is case sensitive. " + "If an attribute specified in the list is not found it will be be emitted to the resulting JSON with an empty string or NULL value.") + ->build()); + +const core::Property AttributesToJSON::AttributesRegularExpression( + core::PropertyBuilder::createProperty("Attributes Regular Expression") + ->withDescription("Regular expression that will be evaluated against the flow file attributes to select the matching attributes. " + "Both the matching attributes and the selected attributes from the Attributes List property will be written in the resulting JSON.") + ->build()); + +const core::Property AttributesToJSON::Destination( + core::PropertyBuilder::createProperty("Destination") + ->withDescription("Control if JSON value is written as a new flowfile attribute 'JSONAttributes' or written in the flowfile content. " + "Writing to flowfile content will overwrite any existing flowfile content.") + ->isRequired(true) + ->withDefaultValue<std::string>(toString(WriteDestination::FLOWFILE_ATTRIBUTE)) + ->withAllowableValues<std::string>(WriteDestination::values()) + ->build()); + +const core::Property AttributesToJSON::IncludeCoreAttributes( + core::PropertyBuilder::createProperty("Include Core Attributes") + ->withDescription("Determines if the FlowFile core attributes which are contained in every FlowFile should be included in the final JSON value generated.") + ->isRequired(true) + ->withDefaultValue<bool>(true) + ->build()); + +const core::Property AttributesToJSON::NullValue( + core::PropertyBuilder::createProperty("Null Value") + ->withDescription("If true a non existing or empty attribute will be NULL in the resulting JSON. If false an empty string will be placed in the JSON.") + ->isRequired(true) + ->withDefaultValue<bool>(false) + ->build()); + +core::Relationship AttributesToJSON::Success("success", "All FlowFiles received are routed to success"); + +void AttributesToJSON::initialize() { + setSupportedProperties({ + AttributesList, + AttributesRegularExpression, + Destination, + IncludeCoreAttributes, + NullValue + }); + setSupportedRelationships({Success}); +} + +void AttributesToJSON::onSchedule(core::ProcessContext* context, core::ProcessSessionFactory* /*sessionFactory*/) { + std::string value; + if (context->getProperty(AttributesList.getName(), value) && !value.empty()) { + attribute_list_ = utils::StringUtils::splitAndTrimRemovingEmpty(value, ","); + } + if (context->getProperty(AttributesRegularExpression.getName(), value) && !value.empty()) { + attributes_regular_expression_ = std::regex(value); + } + write_destination_ = WriteDestination::parse(utils::parsePropertyWithAllowableValuesOrThrow(*context, Destination.getName(), WriteDestination::values()).c_str()); + context->getProperty(IncludeCoreAttributes.getName(), include_core_attributes_); + context->getProperty(NullValue.getName(), null_value_); +} + +bool AttributesToJSON::isCoreAttributeToBeFiltered(const std::string& attribute) const { + return !include_core_attributes_ && core_attributes_.find(attribute) != core_attributes_.end(); +} + +std::unordered_set<std::string> AttributesToJSON::getAttributesToBeWritten(const std::map<std::string, std::string>& flowfile_attributes) const { + std::unordered_set<std::string> attributes; + + for (const auto& attribute : attribute_list_) { + if (!isCoreAttributeToBeFiltered(attribute)) { + attributes.insert(attribute); + } + } + + if (attributes_regular_expression_) { + for (const auto& [key, value] : flowfile_attributes) { + if (!isCoreAttributeToBeFiltered(key) && std::regex_match(key, attributes_regular_expression_.value())) { + attributes.insert(key); + } + } + } + + return attributes; +} + +void AttributesToJSON::addAttributeToJson(rapidjson::Document& document, const std::string& key, const std::string& value) { + rapidjson::Value json_key(key.c_str(), document.GetAllocator()); + rapidjson::Value json_val; + if (!value.empty() || !null_value_) { + json_val.SetString(value.c_str(), document.GetAllocator()); + } + document.AddMember(json_key, json_val, document.GetAllocator()); +} + +std::string AttributesToJSON::buildAttributeJsonData(std::map<std::string, std::string>&& flowfile_attributes) { + auto root = rapidjson::Document(rapidjson::kObjectType); + + if (!attribute_list_.empty() || attributes_regular_expression_) { + auto attributes_to_write = getAttributesToBeWritten(flowfile_attributes); Review comment: we could return an optional set from `getAttributesToBeWritten` and do the "else branch" when that is `nullopt`, this way we wouldn't need to recheck the condition that makes the result "valid" outside of that method -- This is an automated message from the Apache Git Service. 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