adamdebreceni commented on a change in pull request #1188: URL: https://github.com/apache/nifi-minifi-cpp/pull/1188#discussion_r731823829
########## File path: extensions/standard-processors/processors/DefragmentText.cpp ########## @@ -0,0 +1,346 @@ +/** + * 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 "DefragmentText.h" + +#include <vector> + +#include "core/Resource.h" +#include "serialization/PayloadSerializer.h" +#include "TextFragmentUtils.h" +#include "utils/gsl.h" + +namespace org::apache::nifi::minifi::processors { + +const core::Relationship DefragmentText::Success("success", "Flowfiles that have no fragmented messages in them"); +const core::Relationship DefragmentText::Failure("failure", "Flowfiles that failed the defragmentation process"); +const core::Relationship DefragmentText::Self("__self__", "Marks the FlowFile to be owned by this processor"); + +const core::Property DefragmentText::Pattern( + core::PropertyBuilder::createProperty("Pattern") + ->withDescription("A regular expression to match at the start or end of messages.") + ->isRequired(true)->build()); + +const core::Property DefragmentText::PatternLoc( + core::PropertyBuilder::createProperty("Pattern Location")->withDescription("Where to look for the pattern.") + ->withAllowableValues(PatternLocation::values()) + ->withDefaultValue(toString(PatternLocation::START_OF_MESSAGE))->build()); + + +const core::Property DefragmentText::MaxBufferSize( + core::PropertyBuilder::createProperty("Max Buffer Size") + ->withDescription("The maximum buffer size, if the buffer exceeds this, it will be transferred to failure. Expected format is <size> <data unit>") + ->withType(core::StandardValidators::get().DATA_SIZE_VALIDATOR)->build()); + +const core::Property DefragmentText::MaxBufferAge( + core::PropertyBuilder::createProperty("Max Buffer Age")-> + withDescription("The maximum age of a buffer after which the buffer will be transferred to failure. Expected format is <duration> <time unit>")->build()); + +void DefragmentText::initialize() { + setSupportedRelationships({Success, Failure}); + setSupportedProperties({Pattern, PatternLoc, MaxBufferAge, MaxBufferSize}); +} + +void DefragmentText::onSchedule(core::ProcessContext* context, core::ProcessSessionFactory*) { + gsl_Expects(context); + + std::string max_buffer_age_str; + if (context->getProperty(MaxBufferAge.getName(), max_buffer_age_str)) { + core::TimeUnit unit; + uint64_t max_buffer_age; + if (core::Property::StringToTime(max_buffer_age_str, max_buffer_age, unit) && core::Property::ConvertTimeUnitToMS(max_buffer_age, unit, max_buffer_age)) { + buffer_.setMaxAge(max_buffer_age); + logger_->log_trace("The Buffer maximum age is configured to be %" PRIu64 " ms", max_buffer_age); + } + } + + std::string max_buffer_size_str; + if (context->getProperty(MaxBufferSize.getName(), max_buffer_size_str)) { + uint64_t max_buffer_size = core::DataSizeValue(max_buffer_size_str).getValue(); + if (max_buffer_size > 0) { + buffer_.setMaxSize(max_buffer_size); + logger_->log_trace("The Buffer maximum size is configured to be %" PRIu64 " B", max_buffer_size); + } + } + + context->getProperty(PatternLoc.getName(), pattern_location_); + + std::string pattern_str; + if (context->getProperty(Pattern.getName(), pattern_str) && pattern_str != "") { + pattern_ = std::regex(pattern_str); + logger_->log_trace("The Pattern is configured to be %s", pattern_str); + } else { + throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Pattern property missing or invalid"); + } +} + +void DefragmentText::onTrigger(core::ProcessContext*, core::ProcessSession* session) { + gsl_Expects(session); + std::lock_guard<std::mutex> defrag_lock(defrag_mutex_); + auto flowFiles = flow_file_store_.getNewFlowFiles(); + for (auto& file : flowFiles) { + processNextFragment(session, file); + } + std::shared_ptr<core::FlowFile> original_flow_file = session->get(); + processNextFragment(session, original_flow_file); + if (buffer_.maxAgeReached() || buffer_.maxSizeReached()) { + buffer_.flushAndReplace(session, Failure, nullptr); + } +} + +void DefragmentText::processNextFragment(core::ProcessSession *session, const std::shared_ptr<core::FlowFile>& next_fragment) { + if (!next_fragment) + return; + std::shared_ptr<core::FlowFile> split_before_last_pattern; + std::shared_ptr<core::FlowFile> split_after_last_pattern; + bool found_pattern = splitFlowFileAtLastPattern(session, next_fragment, split_before_last_pattern, + split_after_last_pattern); + if (buffer_.canBeAppended(split_before_last_pattern)) { + buffer_.append(session, split_before_last_pattern); Review comment: we could make `append` call the `canBeAppended` at the beginning and return a bool to indicate success, (`canBeAppended` can then be made private) it would limit the chance of misuse and the caller's responsibilites -- This is an automated message from the Apache Git Service. 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