author | František Kučera <franta-hg@frantovo.cz> |
Wed, 27 Apr 2022 23:09:36 +0200 | |
branch | v_0 |
changeset 1 | d7824971fd9e |
parent 0 | f4d7e0965055 |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <memory> |
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#include <string> |
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#include <vector> |
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#include <iostream> |
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#include <sstream> |
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#include <locale> |
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#include <codecvt> |
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#include <unistd.h> |
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#include <librdkafka/rdkafkacpp.h> |
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#include <relpipe/common/type/typedefs.h> |
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#include <relpipe/reader/TypeId.h> |
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#include <relpipe/reader/handlers/RelationalReaderStringHandler.h> |
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#include <relpipe/reader/handlers/AttributeMetadata.h> |
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#include "Configuration.h" |
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#include "Hex.h" |
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namespace relpipe { |
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namespace out { |
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namespace kafka { |
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static void check(RdKafka::Conf::ConfResult result, const std::string& errString) { |
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if (result != RdKafka::Conf::CONF_OK) { |
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throw std::logic_error("Unable to configure Kafka: " + errString); |
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} |
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} |
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static void check(RdKafka::ErrorCode result, const std::string& errString) { |
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if (result != RdKafka::ERR_NO_ERROR) { |
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throw std::logic_error("Kafka error: " + errString); |
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} |
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} |
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static void check(std::shared_ptr<RdKafka::Producer> kafkaProducer, const std::string& errString) { |
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if (kafkaProducer.get() == nullptr) { |
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throw std::logic_error("Unable to create Kafka producer: " + errString); |
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} |
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} |
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class KafkaHandler : public relpipe::reader::handlers::RelationalReaderStringHandler { |
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private: |
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std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings. |
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Configuration configuration; |
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std::shared_ptr<RdKafka::Producer> kafkaProducer; |
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struct CurrentRelation { |
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relpipe::common::type::StringX name; |
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std::vector<relpipe::reader::handlers::AttributeMetadata> attributes; |
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relpipe::common::type::Integer attributeIndex = 0; |
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std::string currentValue; |
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} currentRelation; |
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void connect() { |
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if (!kafkaProducer) { |
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std::string errString; |
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std::shared_ptr<RdKafka::Conf> producerConf(RdKafka::Conf::create(RdKafka::Conf::ConfType::CONF_GLOBAL)); |
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// TODO: configurable groupId, clientId and other parameters |
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std::string groupId = "relpipe-in-kafka-group-" + std::to_string(getpid()); |
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std::string clientId = "relpipe-in-kafka-client-" + std::to_string(getpid()); |
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check(producerConf->set("client.id", clientId, errString), errString); |
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check(producerConf->set("group.id", groupId, errString), errString); |
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check(producerConf->set("bootstrap.servers", "plaintext://127.0.0.1:9092", errString), errString); // "host1:9092,host2:9092" "192.168.1.56:9092" |
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//check(consumerConf->set("debug", "all", errString), errString); |
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kafkaProducer.reset(RdKafka::Producer::create(producerConf.get(), errString)); |
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check(kafkaProducer, errString); |
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} |
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} |
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void sendMessage(const std::string& payload) { |
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std::string errString; |
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check(kafkaProducer->produce( |
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convertor.to_bytes(configuration.queue), |
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RdKafka::Topic::PARTITION_UA, |
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RdKafka::Producer::RK_MSG_COPY, |
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const_cast<char *> (payload.c_str()), payload.size(), |
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nullptr, 0, |
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0, |
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nullptr), errString); |
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} |
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public: |
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KafkaHandler(Configuration configuration) : configuration(configuration) { |
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} |
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void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override { |
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currentRelation = CurrentRelation{name, attributes}; |
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connect(); |
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} |
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void attribute(const relpipe::common::type::StringX& value) override { |
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auto attributeName = currentRelation.attributes[currentRelation.attributeIndex].getAttributeName(); |
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if (attributeName == L"text") currentRelation.currentValue = convertor.to_bytes(value); |
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else if (attributeName == L"data") currentRelation.currentValue = Hex::fromHex(value).str(); |
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currentRelation.attributeIndex++; |
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if (currentRelation.attributeIndex == currentRelation.attributes.size()) { |
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currentRelation.attributeIndex = 0; |
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sendMessage(currentRelation.currentValue); |
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} |
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} |
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void endOfPipe() { |
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std::string errString; |
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check(kafkaProducer->flush(60000), errString); |
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} |
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}; |
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} |
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} |
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} |