--- a/src/CMakeLists.txt Wed Apr 27 21:10:10 2022 +0200
+++ b/src/CMakeLists.txt Wed Apr 27 23:09:36 2022 +0200
@@ -17,7 +17,7 @@
# Relpipe libraries:
INCLUDE(FindPkgConfig)
-pkg_check_modules (RELPIPE_LIBS relpipe-lib-reader.cpp relpipe-lib-cli.cpp)
+pkg_check_modules (RELPIPE_LIBS relpipe-lib-reader.cpp relpipe-lib-cli.cpp rdkafka++)
include_directories(${RELPIPE_LIBS_INCLUDE_DIRS})
link_directories(${RELPIPE_LIBS_LIBRARY_DIRS})
@@ -34,7 +34,7 @@
)
# Link libraries:
-target_link_libraries(${EXECUTABLE_FILE} ${RELPIPE_LIBS_LIBRARIES} rt)
+target_link_libraries(${EXECUTABLE_FILE} ${RELPIPE_LIBS_LIBRARIES})
set_property(TARGET ${EXECUTABLE_FILE} PROPERTY INSTALL_RPATH_USE_LINK_PATH TRUE)
install(TARGETS ${EXECUTABLE_FILE} DESTINATION bin)
--- a/src/Configuration.h Wed Apr 27 21:10:10 2022 +0200
+++ b/src/Configuration.h Wed Apr 27 23:09:36 2022 +0200
@@ -30,7 +30,7 @@
public:
relpipe::common::type::StringX relation = L"kafka";
- relpipe::common::type::StringX queue = L"/relpipe";
+ relpipe::common::type::StringX queue = L"relpipe";
relpipe::common::type::Boolean unlinkOnClose = false;
virtual ~Configuration() {
--- a/src/Kafka.h Wed Apr 27 21:10:10 2022 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,70 +0,0 @@
-/**
- * Relational pipes
- * Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, version 3 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-
-#include <mqueue.h>
-#include <string>
-#include <stdexcept>
-#include <cstring>
-
-namespace relpipe {
-namespace out {
-namespace kafka {
-
-class Kafka {
-private:
- const static size_t MSG_SIZE = 8192; // TODO: configurable/dynamic
- std::string queueName;
- mqd_t handle = -2;
- bool unlinkOnClose = false;
-
- Kafka(std::string queueName, mqd_t handle, bool unlinkOnClose) : queueName(queueName), handle(handle), unlinkOnClose(unlinkOnClose) {
- }
-
-public:
-
- virtual ~Kafka() {
- if (handle >= 0) mq_close(handle);
- if (unlinkOnClose) mq_unlink(queueName.c_str());
- }
-
- static Kafka* open(std::string queueName, bool unlinkOnClose = false) {
- mqd_t handle = mq_open(queueName.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (handle >= 0) return new Kafka(queueName, handle, unlinkOnClose);
- else throw std::logic_error("Unable to open Kafka: " + queueName + " error: " + strerror(errno));
- }
-
- void send(std::string message) {
- int result = mq_send(handle, message.c_str(), message.size(), 0);
- if (result) throw std::logic_error("Unable to send message to" + queueName + " error: " + strerror(errno));
- }
-
- std::string receive() {
- char buffer[MSG_SIZE + 1];
- memset(buffer, 0, MSG_SIZE + 1);
- ssize_t msgSize = mq_receive(handle, buffer, MSG_SIZE, nullptr);
-
- if (msgSize > sizeof (buffer))throw std::logic_error("Invalid Kafka message size.");
- else if (msgSize >= 0) return std::string(buffer, msgSize);
- else throw std::logic_error("Unable to receive Kafka message from " + queueName + " error: " + strerror(errno));
- }
-
-};
-
-}
-}
-}
--- a/src/KafkaHandler.h Wed Apr 27 21:10:10 2022 +0200
+++ b/src/KafkaHandler.h Wed Apr 27 23:09:36 2022 +0200
@@ -23,13 +23,15 @@
#include <sstream>
#include <locale>
#include <codecvt>
+#include <unistd.h>
+
+#include <librdkafka/rdkafkacpp.h>
#include <relpipe/common/type/typedefs.h>
#include <relpipe/reader/TypeId.h>
#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
#include <relpipe/reader/handlers/AttributeMetadata.h>
-#include "Kafka.h"
#include "Configuration.h"
#include "Hex.h"
@@ -37,11 +39,29 @@
namespace out {
namespace kafka {
+static void check(RdKafka::Conf::ConfResult result, const std::string& errString) {
+ if (result != RdKafka::Conf::CONF_OK) {
+ throw std::logic_error("Unable to configure Kafka: " + errString);
+ }
+}
+
+static void check(RdKafka::ErrorCode result, const std::string& errString) {
+ if (result != RdKafka::ERR_NO_ERROR) {
+ throw std::logic_error("Kafka error: " + errString);
+ }
+}
+
+static void check(std::shared_ptr<RdKafka::Producer> kafkaProducer, const std::string& errString) {
+ if (kafkaProducer.get() == nullptr) {
+ throw std::logic_error("Unable to create Kafka producer: " + errString);
+ }
+}
+
class KafkaHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {
private:
std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
Configuration configuration;
- shared_ptr<Kafka> mq;
+ std::shared_ptr<RdKafka::Producer> kafkaProducer;
struct CurrentRelation {
relpipe::common::type::StringX name;
@@ -50,14 +70,45 @@
std::string currentValue;
} currentRelation;
+ void connect() {
+ if (!kafkaProducer) {
+ std::string errString;
+ std::shared_ptr<RdKafka::Conf> producerConf(RdKafka::Conf::create(RdKafka::Conf::ConfType::CONF_GLOBAL));
+
+ // TODO: configurable groupId, clientId and other parameters
+ std::string groupId = "relpipe-in-kafka-group-" + std::to_string(getpid());
+ std::string clientId = "relpipe-in-kafka-client-" + std::to_string(getpid());
+
+ check(producerConf->set("client.id", clientId, errString), errString);
+ check(producerConf->set("group.id", groupId, errString), errString);
+ check(producerConf->set("bootstrap.servers", "plaintext://127.0.0.1:9092", errString), errString); // "host1:9092,host2:9092" "192.168.1.56:9092"
+ //check(consumerConf->set("debug", "all", errString), errString);
+
+ kafkaProducer.reset(RdKafka::Producer::create(producerConf.get(), errString));
+ check(kafkaProducer, errString);
+ }
+ }
+
+ void sendMessage(const std::string& payload) {
+ std::string errString;
+ check(kafkaProducer->produce(
+ convertor.to_bytes(configuration.queue),
+ RdKafka::Topic::PARTITION_UA,
+ RdKafka::Producer::RK_MSG_COPY,
+ const_cast<char *> (payload.c_str()), payload.size(),
+ nullptr, 0,
+ 0,
+ nullptr), errString);
+ }
+
public:
KafkaHandler(Configuration configuration) : configuration(configuration) {
- mq.reset(Kafka::open(convertor.to_bytes(configuration.queue), configuration.unlinkOnClose));
}
void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {
currentRelation = CurrentRelation{name, attributes};
+ connect();
}
void attribute(const relpipe::common::type::StringX& value) override {
@@ -69,13 +120,14 @@
currentRelation.attributeIndex++;
if (currentRelation.attributeIndex == currentRelation.attributes.size()) {
currentRelation.attributeIndex = 0;
- mq->send(currentRelation.currentValue);
+ sendMessage(currentRelation.currentValue);
}
}
void endOfPipe() {
-
+ std::string errString;
+ check(kafkaProducer->flush(60000), errString);
}
};