szaszm commented on code in PR #1698: URL: https://github.com/apache/nifi-minifi-cpp/pull/1698#discussion_r1453403835
########## extensions/grafana-loki/PushGrafanaLoki.cpp: ########## @@ -0,0 +1,249 @@ +/** + * 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 "PushGrafanaLoki.h" + +#include <utility> + +#include "core/ProcessContext.h" +#include "core/ProcessSession.h" +#include "utils/ProcessorConfigUtils.h" +#include "utils/StringUtils.h" + +namespace org::apache::nifi::minifi::extensions::grafana::loki { + +void PushGrafanaLoki::LogBatch::add(const std::shared_ptr<core::FlowFile>& flowfile) { + gsl_Expects(state_manager_); + if (log_line_batch_wait_ && batched_flowfiles_.empty()) { + start_push_time_ = std::chrono::steady_clock::now(); + std::unordered_map<std::string, std::string> state; + state["start_push_time"] = std::to_string(std::chrono::duration_cast<std::chrono::milliseconds>(start_push_time_.time_since_epoch()).count()); + logger_->log_debug("Saved start push time to state: {}", state["start_push_time"]); + state_manager_->set(state); + } + batched_flowfiles_.push_back(flowfile); +} + +void PushGrafanaLoki::LogBatch::restore(const std::shared_ptr<core::FlowFile>& flowfile) { + batched_flowfiles_.push_back(flowfile); +} + +std::vector<std::shared_ptr<core::FlowFile>> PushGrafanaLoki::LogBatch::flush() { + gsl_Expects(state_manager_); + start_push_time_ = {}; + auto result = batched_flowfiles_; + batched_flowfiles_.clear(); + if (log_line_batch_wait_) { + start_push_time_ = {}; + std::unordered_map<std::string, std::string> state; + logger_->log_debug("Reset start push time state"); + state["start_push_time"] = "0"; + state_manager_->set(state); + } + return result; +} + +bool PushGrafanaLoki::LogBatch::isReady() const { + return (log_line_batch_size_ && batched_flowfiles_.size() >= *log_line_batch_size_) || (log_line_batch_wait_ && std::chrono::steady_clock::now() - start_push_time_ >= *log_line_batch_wait_); +} + +void PushGrafanaLoki::LogBatch::setLogLineBatchSize(std::optional<uint64_t> log_line_batch_size) { + log_line_batch_size_ = log_line_batch_size; +} + +void PushGrafanaLoki::LogBatch::setLogLineBatchWait(std::optional<std::chrono::milliseconds> log_line_batch_wait) { + log_line_batch_wait_ = log_line_batch_wait; +} + +void PushGrafanaLoki::LogBatch::setStateManager(core::StateManager* state_manager) { + state_manager_ = state_manager; +} + +void PushGrafanaLoki::LogBatch::setStartPushTime(std::chrono::steady_clock::time_point start_push_time) { + start_push_time_ = start_push_time; +} + +const core::Relationship PushGrafanaLoki::Self("__self__", "Marks the FlowFile to be owned by this processor"); + +std::shared_ptr<minifi::controllers::SSLContextService> PushGrafanaLoki::getSSLContextService(core::ProcessContext& context) { + if (auto ssl_context = context.getProperty(PushGrafanaLoki::SSLContextService)) { + return std::dynamic_pointer_cast<minifi::controllers::SSLContextService>(context.getControllerService(*ssl_context)); + } + return std::shared_ptr<minifi::controllers::SSLContextService>{}; +} + +std::string PushGrafanaLoki::readLogLineFromFlowFile(const std::shared_ptr<core::FlowFile>& flow_file, core::ProcessSession& session) { + auto read_buffer_result = session.readBuffer(flow_file); + return {reinterpret_cast<const char*>(read_buffer_result.buffer.data()), read_buffer_result.buffer.size()}; +} + +void PushGrafanaLoki::setUpStateManager(core::ProcessContext& context) { + auto state_manager = context.getStateManager(); + if (state_manager == nullptr) { + throw Exception(PROCESSOR_EXCEPTION, "Failed to get StateManager"); + } + log_batch_.setStateManager(state_manager); + + std::unordered_map<std::string, std::string> state_map; + if (state_manager->get(state_map)) { + auto it = state_map.find("start_push_time"); + if (it != state_map.end()) { + logger_->log_info("Restored start push time from processor state: {}", it->second); + std::chrono::steady_clock::time_point start_push_time{std::chrono::milliseconds{std::stoll(it->second)}}; + log_batch_.setStartPushTime(start_push_time); + } + } +} + +std::map<std::string, std::string> PushGrafanaLoki::buildStreamLabelMap(core::ProcessContext& context) { + std::map<std::string, std::string> stream_label_map; + if (auto stream_labels_str = context.getProperty(StreamLabels)) { + auto stream_labels = utils::string::splitAndTrimRemovingEmpty(*stream_labels_str, ","); + if (stream_labels.empty()) { + throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Missing or invalid Stream Label Attributes"); + } + for (const auto& label : stream_labels) { + auto stream_labels = utils::string::splitAndTrimRemovingEmpty(label, "="); + if (stream_labels.size() != 2) { + throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Missing or invalid Stream Label Attributes"); + } + stream_label_map[stream_labels[0]] = stream_labels[1]; + } + } else { + throw Exception(PROCESS_SCHEDULE_EXCEPTION, "Missing or invalid Stream Label Attributes"); + } + return stream_label_map; +} + +void PushGrafanaLoki::onSchedule(core::ProcessContext& context, core::ProcessSessionFactory&) { + setUpStateManager(context); + setUpStreamLabels(context); + + if (auto log_line_metadata_attributes = context.getProperty(LogLineMetadataAttributes)) { + log_line_metadata_attributes_ = utils::string::splitAndTrimRemovingEmpty(*log_line_metadata_attributes, ","); + } + + auto log_line_batch_wait = context.getProperty<core::TimePeriodValue>(LogLineBatchWait); + auto log_line_batch_size = context.getProperty<uint64_t>(LogLineBatchSize); + if (log_line_batch_size && *log_line_batch_size < 1) { Review Comment: strange indentation here -- This is an automated message from the Apache Git Service. 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