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168
extensions/standard-processors/processors/SplitContent.cpp
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| /** | ||
| * | ||
| * 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. | ||
| */ | ||
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| #include "SplitContent.h" | ||
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| #include <range/v3/view/split.hpp> | ||
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| #include "core/ProcessContext.h" | ||
| #include "core/ProcessSession.h" | ||
| #include "core/Resource.h" | ||
| #include "core/FlowFile.h" | ||
| #include "utils/gsl.h" | ||
| #include "utils/ProcessorConfigUtils.h" | ||
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| namespace org::apache::nifi::minifi::processors { | ||
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| constexpr size_t BUFFER_TARGET_SIZE = 1024; | ||
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| void SplitContent::initialize() { | ||
| setSupportedProperties(Properties); | ||
| setSupportedRelationships(Relationships); | ||
| } | ||
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| void SplitContent::onSchedule(core::ProcessContext& context, core::ProcessSessionFactory&) { | ||
| auto byte_sequence_str = utils::getRequiredPropertyOrThrow<std::string>(context, ByteSequence.name); | ||
| const auto byte_sequence_format = utils::parseEnumProperty<ByteSequenceFormat>(context, ByteSequenceFormatProperty); | ||
| if (byte_sequence_format == ByteSequenceFormat::Hexadecimal) { | ||
| byte_sequence_ = utils::string::from_hex(byte_sequence_str); | ||
| } else { | ||
| byte_sequence_.resize(byte_sequence_str.size()); | ||
| std::ranges::transform(byte_sequence_str, byte_sequence_.begin(), [] (char c) { return static_cast<std::byte>(c); }); | ||
| } | ||
| byte_sequence_location_ = utils::parseEnumProperty<ByteSequenceLocation>(context, ByteSequenceLocationProperty); | ||
| keep_byte_sequence = utils::getRequiredPropertyOrThrow<bool>(context, KeepByteSequence.name); | ||
| } | ||
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| std::shared_ptr<core::FlowFile> SplitContent::createNewSplit(core::ProcessSession& session) const { | ||
| auto next_split = session.create(); | ||
| if (!next_split) { | ||
| throw Exception(PROCESSOR_EXCEPTION, "Couldn't create FlowFile"); | ||
| } | ||
| if (keep_byte_sequence && byte_sequence_location_ == ByteSequenceLocation::Leading) { | ||
| session.appendBuffer(next_split, byte_sequence_); | ||
| } | ||
| return next_split; | ||
| } | ||
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| void SplitContent::finalizeLatestSplitContent(core::ProcessSession& session, const std::shared_ptr<core::FlowFile>& latest_split, const std::vector<std::byte>& buffer) const { | ||
| const std::span<const std::byte> data_without_byte_sequence{buffer.data(), buffer.size() - byte_sequence_.size()}; | ||
| session.appendBuffer(latest_split, data_without_byte_sequence); | ||
| if (keep_byte_sequence && byte_sequence_location_ == ByteSequenceLocation::Trailing) { | ||
| session.appendBuffer(latest_split, byte_sequence_); | ||
| } | ||
| } | ||
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| void SplitContent::finalizeLastSplitContent(core::ProcessSession& session, | ||
| std::vector<std::shared_ptr<core::FlowFile>>& splits, | ||
| const std::vector<std::byte>& buffer, | ||
| const bool ended_with_byte_sequence) const { | ||
| if (ended_with_byte_sequence && splits.back()->getSize() != 0) { | ||
| if (keep_byte_sequence && byte_sequence_location_ == ByteSequenceLocation::Leading) { | ||
| const auto last_split = session.create(); | ||
| if (!last_split) { | ||
| throw Exception(PROCESSOR_EXCEPTION, "Couldn't create FlowFile"); | ||
| } | ||
| splits.push_back(last_split); | ||
| session.appendBuffer(splits.back(), byte_sequence_); | ||
| } | ||
| } else { | ||
| session.appendBuffer(splits.back(), buffer); | ||
| } | ||
| } | ||
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| namespace { | ||
| std::shared_ptr<core::FlowFile> createFirstSplit(core::ProcessSession& session) { | ||
| auto first_split = session.create(); | ||
| if (!first_split) { | ||
| throw Exception(PROCESSOR_EXCEPTION, "Couldn't create FlowFile"); | ||
| } | ||
| return first_split; | ||
| } | ||
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| void updateSplitAttributesAndTransfer(core::ProcessSession& session, const std::vector<std::shared_ptr<core::FlowFile>>& splits, const core::FlowFile& original) { | ||
| const std::string fragment_identifier_ = utils::IdGenerator::getIdGenerator()->generate().to_string(); | ||
| for (size_t split_i = 0; split_i < splits.size(); ++split_i) { | ||
| const auto& split = splits[split_i]; | ||
| split->setAttribute(SplitContent::FragmentCountOutputAttribute.name, std::to_string(splits.size())); | ||
| split->setAttribute(SplitContent::FragmentIndexOutputAttribute.name, std::to_string(split_i + 1)); // One based indexing | ||
| split->setAttribute(SplitContent::FragmentIdentifierOutputAttribute.name, fragment_identifier_); | ||
| split->setAttribute(SplitContent::SegmentOriginalFilenameOutputAttribute.name, original.getAttribute(core::SpecialFlowAttribute::FILENAME).value_or("")); | ||
| session.transfer(split, SplitContent::Splits); | ||
| } | ||
| } | ||
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| bool lastSplitIsEmpty(const std::vector<std::shared_ptr<core::FlowFile>>& splits) { | ||
| return splits.back()->getSize() != 0; | ||
| } | ||
| } // namespace | ||
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| void SplitContent::onTrigger(core::ProcessContext& context, core::ProcessSession& session) { | ||
| gsl_Assert(!byte_sequence_.empty()); | ||
| const auto original = session.get(); | ||
| if (!original) { | ||
| context.yield(); | ||
| return; | ||
| } | ||
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| const auto ff_content_stream = session.getFlowFileContentStream(*original); | ||
| if (!ff_content_stream) { | ||
| throw Exception(PROCESSOR_EXCEPTION, fmt::format("Couldn't access the ContentStream of {}", original->getUUID().to_string())); | ||
| } | ||
| std::vector<std::byte> buffer{}; | ||
| buffer.reserve(BUFFER_TARGET_SIZE + byte_sequence_.size()); | ||
| size_t matching_bytes = 0; | ||
| bool ended_with_byte_sequence = false; | ||
| std::vector<std::shared_ptr<core::FlowFile>> splits{}; | ||
| splits.push_back(createFirstSplit(session)); | ||
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| while (auto latest_byte = ff_content_stream->readByte()) { | ||
| buffer.push_back(*latest_byte); | ||
| if (ended_with_byte_sequence) { | ||
| ended_with_byte_sequence = false; | ||
| if (lastSplitIsEmpty(splits)) { | ||
| splits.push_back(createNewSplit(session)); | ||
| } | ||
| } | ||
| if (latest_byte == byte_sequence_[matching_bytes]) { | ||
| matching_bytes++; | ||
| if (matching_bytes == byte_sequence_.size()) { | ||
| // Found the Byte Sequence | ||
| finalizeLatestSplitContent(session, splits.back(), buffer); | ||
| ended_with_byte_sequence = true; | ||
| matching_bytes = 0; | ||
| buffer.clear(); | ||
| } | ||
| } else { | ||
| matching_bytes = 0; | ||
| if (buffer.size() >= BUFFER_TARGET_SIZE) { | ||
| session.appendBuffer(splits.back(), buffer); | ||
| buffer.clear(); | ||
| } | ||
| } | ||
| } | ||
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| finalizeLastSplitContent(session, splits, buffer, ended_with_byte_sequence); | ||
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| updateSplitAttributesAndTransfer(session, splits, *original); | ||
| session.transfer(original, Original); | ||
| } | ||
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| REGISTER_RESOURCE(SplitContent, Processor); | ||
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| } // namespace org::apache::nifi::minifi::processors |
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