example/client-cpp-example/src/MultiSvrNodeClient.cpp

/**
* 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 <iostream>
#include <memory>
#include <string>
#include <vector>

#include "Session.h"
#include "SessionBuilder.h"
#include "SessionDataSet.h"
#include "TableSessionBuilder.h"

namespace {

void RunTreeExample() {
    try {
        std::vector<std::string> node_urls = {
            "127.0.0.1:6667", "127.0.0.1:6668", "127.0.0.1:6669"};

        auto builder = std::make_shared<SessionBuilder>();
        auto session = std::shared_ptr<Session>(
            builder->username("root")
                ->password("root")
                ->nodeUrls(node_urls)
                ->build());

        session->open();
        if (!session->checkTimeseriesExists("root.test.d1.s1")) {
            session->createTimeseries("root.test.d1.s1", TSDataType::INT64,
                                      TSEncoding::RLE, CompressionType::SNAPPY);
        }
        session->deleteTimeseries("root.test.d1.s1");
        session->close();
    } catch (const std::exception& e) {
        std::cout << "Caught exception: " << e.what() << std::endl;
    }
}

void RunTableExample() {
    try {
        std::vector<std::string> node_urls = {
            "127.0.0.1:6669", "127.0.0.1:6668", "127.0.0.1:6667"};

        auto builder = std::make_shared<TableSessionBuilder>();
        auto session = std::shared_ptr<TableSession>(
            builder->username("root")
                ->password("root")
                ->nodeUrls(node_urls)
                ->build());

        session->open();

        session->executeNonQueryStatement("DROP DATABASE IF EXISTS db1");
        session->executeNonQueryStatement("CREATE DATABASE db1");
        session->executeNonQueryStatement("DROP DATABASE IF EXISTS db2");
        session->executeNonQueryStatement("CREATE DATABASE db2");

        session->close();
    } catch (const std::exception& e) {
        std::cout << "Caught exception: " << e.what() << std::endl;
    }
}


// Example: continuously write/query data so you can manually stop a node
// to test client failover behavior.
void RunResilienceExample() {
    try {
        std::vector<std::string> node_urls = {
            "127.0.0.1:6667", "127.0.0.1:6668", "127.0.0.1:6669"};

        auto builder = std::make_shared<SessionBuilder>();
        auto session = std::shared_ptr<Session>(
            builder->username("root")
                ->password("root")
                ->nodeUrls(node_urls)
                ->build());

        session->open();

        if (!session->checkTimeseriesExists("root.resilience.d1.s1")) {
            session->createTimeseries("root.resilience.d1.s1", TSDataType::INT64,
                                      TSEncoding::RLE, CompressionType::SNAPPY);
        }

        std::cout << "Starting resilience test. "
                     "Stop one node manually to see failover handling..."
                  << std::endl;

        for (int i = 0; i < 60; ++i) {  // run ~60 seconds
            int64_t timestamp = std::chrono::system_clock::now().time_since_epoch() /
                                std::chrono::milliseconds(1);
            std::string value = to_string(i);
            const char* value_cstr = value.c_str();

            try {
                session->insertRecord("root.resilience.d1", timestamp,
                                  {"s1"}, {TSDataType::INT64},
                                  {const_cast<char*>(value_cstr)});
                std::cout << "[Insert] ts=" << timestamp << ", value=" << value
                          << std::endl;

                auto dataset = session->executeQueryStatement(
                    "SELECT s1 FROM root.resilience.d1 LIMIT 1");
                std::cout << "[Query] Got dataset: "
                          << (dataset ? "Success" : "Null") << std::endl;

            } catch (const std::exception& e) {
                std::cout << "Caught exception during resilience loop: " << e.what()
                          << std::endl;
            }

            std::this_thread::sleep_for(std::chrono::seconds(1));
        }

        session->close();
    } catch (const std::exception& e) {
        std::cout << "Caught exception in RunResilienceExample: " << e.what()
                  << std::endl;
    }
}

}  // namespace

int main() {
    //RunTreeExample();
    //RunTableExample();
    RunResilienceExample();
    return 0;
}