adamdebreceni commented on a change in pull request #1188: URL: https://github.com/apache/nifi-minifi-cpp/pull/1188#discussion_r735472529
########## File path: extensions/standard-processors/processors/DefragmentText.cpp ########## @@ -0,0 +1,340 @@ +/** + * 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("Whether the pattern is located at the start or at the end of the messages.") + ->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(std::chrono::milliseconds(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.empty()) { + 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); + 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; + if (!buffer_.isCompatible(next_fragment)) { + buffer_.flushAndReplace(session, Failure, nullptr); + session->transfer(next_fragment, Failure); + 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); + buffer_.append(session, split_before_last_pattern); + if (found_pattern) { + buffer_.flushAndReplace(session, Success, split_after_last_pattern); + } + session->remove(next_fragment); +} + + +void DefragmentText::updateAttributesForSplitFiles(const std::shared_ptr<const core::FlowFile> &original_flow_file, + const std::shared_ptr<core::FlowFile> &split_before_last_pattern, + const std::shared_ptr<core::FlowFile> &split_after_last_pattern, + const size_t split_position) const { + std::string base_name, post_name, offset_str; + if (!original_flow_file->getAttribute(textfragmentutils::BASE_NAME_ATTRIBUTE, base_name)) + return; + if (!original_flow_file->getAttribute(textfragmentutils::POST_NAME_ATTRIBUTE, post_name)) + return; + if (!original_flow_file->getAttribute(textfragmentutils::OFFSET_ATTRIBUTE, offset_str)) + return; + + size_t fragment_offset = std::stoi(offset_str); + + if (split_before_last_pattern) { + std::string first_part_name = textfragmentutils::createFileName(base_name, post_name, fragment_offset, split_before_last_pattern->getSize()); + split_before_last_pattern->setAttribute(core::SpecialFlowAttribute::FILENAME, first_part_name); + } + if (split_after_last_pattern) { + std::string second_part_name = textfragmentutils::createFileName(base_name, post_name, fragment_offset + split_position, split_after_last_pattern->getSize()); + split_after_last_pattern->setAttribute(core::SpecialFlowAttribute::FILENAME, second_part_name); + split_after_last_pattern->setAttribute(textfragmentutils::OFFSET_ATTRIBUTE, std::to_string(fragment_offset + split_position)); + } +} + +namespace { +class AppendFlowFileToFlowFile : public OutputStreamCallback { + public: + explicit AppendFlowFileToFlowFile(const std::shared_ptr<core::FlowFile>& flow_file_to_append, PayloadSerializer& serializer) + : flow_file_to_append_(flow_file_to_append), serializer_(serializer) {} + + int64_t process(const std::shared_ptr<io::BaseStream> &stream) override { + return serializer_.serialize(flow_file_to_append_, stream); + } + private: + const std::shared_ptr<core::FlowFile>& flow_file_to_append_; + PayloadSerializer& serializer_; +}; + +void updateAppendedAttributes(const std::shared_ptr<core::FlowFile>& buffered_ff) { + std::string base_name, post_name, offset_str; + if (!buffered_ff->getAttribute(textfragmentutils::BASE_NAME_ATTRIBUTE, base_name)) + return; + if (!buffered_ff->getAttribute(textfragmentutils::POST_NAME_ATTRIBUTE, post_name)) + return; + if (!buffered_ff->getAttribute(textfragmentutils::OFFSET_ATTRIBUTE, offset_str)) + return; + size_t fragment_offset = std::stoi(offset_str); + + std::string buffer_new_name = textfragmentutils::createFileName(base_name, post_name, fragment_offset, buffered_ff->getSize()); + buffered_ff->setAttribute(core::SpecialFlowAttribute::FILENAME, buffer_new_name); +} + +class LastPatternFinder : public InputStreamCallback { + public: + LastPatternFinder(const std::regex &pattern, DefragmentText::PatternLocation pattern_location) : pattern_(pattern), pattern_location_(pattern_location) {} + + ~LastPatternFinder() override = default; + + int64_t process(const std::shared_ptr<io::BaseStream> &stream) override { + if (nullptr == stream) + return 0; + std::string content; + content.resize(stream->size()); + const auto ret = stream->read(reinterpret_cast<uint8_t *>(content.data()), stream->size()); + if (io::isError(ret)) + return -1; + searchContent(content); + + return 0; + } + + const std::optional<size_t> &getLastPatternPosition() const { return last_pattern_location; } + + protected: + void searchContent(const std::string &content) { + auto matches_begin = std::sregex_iterator(content.begin(), content.end(), pattern_); + auto number_of_matches = std::distance(matches_begin, std::sregex_iterator()); + if (number_of_matches > 0) { + auto last_match = std::next(matches_begin, number_of_matches - 1); + last_pattern_location = last_match->position(0); + if (pattern_location_ == DefragmentText::PatternLocation::END_OF_MESSAGE) + last_pattern_location.value() += last_match->length(0); + } else { + last_pattern_location = std::nullopt; + } + } + + const std::regex &pattern_; + DefragmentText::PatternLocation pattern_location_; + std::optional<size_t> last_pattern_location; +}; +} // namespace + +bool DefragmentText::splitFlowFileAtLastPattern(core::ProcessSession *session, + const std::shared_ptr<core::FlowFile> &original_flow_file, + std::shared_ptr<core::FlowFile> &split_before_last_pattern, + std::shared_ptr<core::FlowFile> &split_after_last_pattern) const { + LastPatternFinder find_last_pattern(pattern_, pattern_location_); + session->read(original_flow_file, &find_last_pattern); + if (auto split_position = find_last_pattern.getLastPatternPosition()) { + if (*split_position != 0) { + split_before_last_pattern = session->clone(original_flow_file, 0, *split_position); + } + if (*split_position != original_flow_file->getSize()) { + split_after_last_pattern = session->clone(original_flow_file, *split_position, original_flow_file->getSize() - *split_position); + } + updateAttributesForSplitFiles(original_flow_file, split_before_last_pattern, split_after_last_pattern, *split_position); + return true; + } else { + split_before_last_pattern = session->clone(original_flow_file); + split_after_last_pattern = nullptr; + return false; + } +} + +void DefragmentText::restore(const std::shared_ptr<core::FlowFile>& flowFile) { + if (!flowFile) + return; + flow_file_store_.put(flowFile); +} + +std::set<std::shared_ptr<core::Connectable>> DefragmentText::getOutGoingConnections(const std::string &relationship) const { + auto result = core::Connectable::getOutGoingConnections(relationship); + if (relationship == Self.getName()) { + result.insert(std::static_pointer_cast<core::Connectable>(std::const_pointer_cast<core::Processor>(shared_from_this()))); + } + return result; +} + +void DefragmentText::Buffer::append(core::ProcessSession* session, const std::shared_ptr<core::FlowFile>& flow_file_to_append) { + if (!flow_file_to_append) + return; + if (empty()) { + store(session, flow_file_to_append); + return; + } + auto flowFileReader = [&] (const std::shared_ptr<core::FlowFile>& ff, InputStreamCallback* cb) { + return session->read(ff, cb); + }; + PayloadSerializer serializer(flowFileReader); + AppendFlowFileToFlowFile append_flow_file_to_flow_file(flow_file_to_append, serializer); + session->add(buffered_flow_file_); + session->append(buffered_flow_file_, &append_flow_file_to_flow_file); + updateAppendedAttributes(buffered_flow_file_); + session->transfer(buffered_flow_file_, Self); + + session->remove(flow_file_to_append); +} + +bool DefragmentText::Buffer::maxSizeReached() const { + return !empty() + && max_size_.has_value() + && (max_size_.value() < buffered_flow_file_->getSize()); +} + +bool DefragmentText::Buffer::maxAgeReached() const { + return !empty() + && max_age_.has_value() + && (creation_time_ + max_age_.value() < std::chrono::steady_clock::now()); +} + +void DefragmentText::Buffer::setMaxAge(std::chrono::milliseconds max_age) { + max_age_ = std::chrono::milliseconds(max_age); Review comment: this conversion is now not needed -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@nifi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
