IXWebSocket/ws/ws_cobra_subscribe.cpp

/*
 *  ws_cobra_subscribe.cpp
 *  Author: Benjamin Sergeant
 *  Copyright (c) 2019 Machine Zone, Inc. All rights reserved.
 */

#include <atomic>
#include <chrono>
#include <iostream>
#include <ixcobra/IXCobraConnection.h>
#include <spdlog/spdlog.h>
#include <sstream>
#include <thread>

namespace ix
{
    using StreamWriterPtr = std::unique_ptr<Json::StreamWriter>;

    StreamWriterPtr makeStreamWriter()
    {
        Json::StreamWriterBuilder builder;
        builder["commentStyle"] = "None";
        builder["indentation"] = ""; // will make the JSON object compact
        std::unique_ptr<Json::StreamWriter> jsonWriter(builder.newStreamWriter());
        return jsonWriter;
    }

    void writeToStdout(bool fluentd,
                       const StreamWriterPtr& jsonWriter,
                       const Json::Value& msg,
                       const std::string& position)
    {
        Json::Value enveloppe;
        if (fluentd)
        {
            enveloppe["producer"] = "cobra";
            enveloppe["consumer"] = "fluentd";

            Json::Value msgWithPosition(msg);
            msgWithPosition["position"] = position;
            enveloppe["message"] = msgWithPosition;

            jsonWriter->write(enveloppe, &std::cout);
            std::cout << std::endl;  // add lf and flush
        }
        else
        {
            enveloppe = msg;
            std::cout << position << " ";
            jsonWriter->write(enveloppe, &std::cout);
            std::cout << std::endl;
        }
    }

    int ws_cobra_subscribe_main(const ix::CobraConfig& config,
                                const std::string& channel,
                                const std::string& filter,
                                const std::string& position,
                                bool quiet,
                                bool fluentd)
    {
        ix::CobraConnection conn;
        conn.configure(config);
        conn.connect();

        std::atomic<int> msgPerSeconds(0);
        std::atomic<int> msgCount(0);
        std::atomic<bool> fatalCobraError(false);
        auto jsonWriter = makeStreamWriter();

        auto timer = [&msgPerSeconds, &msgCount, &fatalCobraError] {
            while (!fatalCobraError)
            {
                spdlog::info("#messages {} msg/s {}", msgCount, msgPerSeconds);

                msgPerSeconds = 0;
                auto duration = std::chrono::seconds(1);
                std::this_thread::sleep_for(duration);
            }
        };

        std::thread t(timer);

        std::string subscriptionPosition(position);

        conn.setEventCallback([&conn,
                               &channel,
                               &jsonWriter,
                               &filter,
                               &subscriptionPosition,
                               &msgCount,
                               &msgPerSeconds,
                               &quiet,
                               &fluentd,
                               &fatalCobraError](ix::CobraConnectionEventType eventType,
                                                 const std::string& errMsg,
                                                 const ix::WebSocketHttpHeaders& headers,
                                                 const std::string& subscriptionId,
                                                 CobraConnection::MsgId msgId) {
            if (eventType == ix::CobraConnection_EventType_Open)
            {
                spdlog::info("Subscriber connected");

                for (auto it : headers)
                {
                    spdlog::info("{}: {}", it.first, it.second);
                }
            }
            else if (eventType == ix::CobraConnection_EventType_Authenticated)
            {
                spdlog::info("Subscriber authenticated");
                spdlog::info("Subscribing to {} at position {}", channel, subscriptionPosition);
                conn.subscribe(
                    channel,
                    filter,
                    subscriptionPosition,
                    [&jsonWriter,
                     &quiet,
                     &msgPerSeconds,
                     &msgCount,
                     &fluentd,
                     &subscriptionPosition](const Json::Value& msg, const std::string& position) {
                        if (!quiet)
                        {
                            writeToStdout(fluentd, jsonWriter, msg, position);
                        }

                        msgPerSeconds++;
                        msgCount++;

                        subscriptionPosition = position;
                    });
            }
            else if (eventType == ix::CobraConnection_EventType_Subscribed)
            {
                spdlog::info("Subscriber: subscribed to channel {}", subscriptionId);
            }
            else if (eventType == ix::CobraConnection_EventType_UnSubscribed)
            {
                spdlog::info("Subscriber: unsubscribed from channel {}", subscriptionId);
            }
            else if (eventType == ix::CobraConnection_EventType_Error)
            {
                spdlog::error("Subscriber: error {}", errMsg);
            }
            else if (eventType == ix::CobraConnection_EventType_Published)
            {
                spdlog::error("Published message hacked: {}", msgId);
            }
            else if (eventType == ix::CobraConnection_EventType_Pong)
            {
                spdlog::info("Received websocket pong");
            }
            else if (eventType == ix::CobraConnection_EventType_Handshake_Error)
            {
                spdlog::error("Subscriber: Handshake error: {}", errMsg);
                fatalCobraError = true;
            }
            else if (eventType == ix::CobraConnection_EventType_Authentication_Error)
            {
                spdlog::error("Subscriber: Authentication error: {}", errMsg);
                fatalCobraError = true;
            }
            else if (eventType == ix::CobraConnection_EventType_Subscription_Error)
            {
                spdlog::error("Subscriber: Subscription error: {}", errMsg);
                fatalCobraError = true;
            }
        });

        while (!fatalCobraError)
        {
            auto duration = std::chrono::seconds(1);
            std::this_thread::sleep_for(duration);
        }

        conn.disconnect();
        t.join();

        return fatalCobraError ? 1 : 0;
    }
} // namespace ix