liquidity_consumer.hpp

// A liquidity consumer trading strategy.
// Copyright 2020 Christian Kauten
//
// Author: Christian Kauten (kautenja@auburn.edu)
//
// 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, either version 3 of the License, or
// (at your option) any later version.
// 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/>.
//
// Reference: High frequency trading strategies, market fragility and price
//            spikes: an agent based model perspective
// Reference: An Agent-Based Model for Market Impact
//
 
#ifndef STRATEGIES_LIQUIDITY_CONSUMER_HPP
#define STRATEGIES_LIQUIDITY_CONSUMER_HPP
 
#include "data_feed/receiver.hpp"
#include "order_entry/client.hpp"
#include "maths/probability.hpp"
#include <nlohmann/json.hpp>
#include <atomic>
#include <iostream>
 
namespace Strategies {
 
class LiquidityConsumer {
 private:
    typedef DataFeed::Receiver<LiquidityConsumer> DataFeedReceiver;
    DataFeedReceiver receiver;
    OrderEntry::Client client;
    asio::steady_timer timer;
    uint32_t sleep_time;
    float P_act;
    std::atomic<bool> is_running;
 
    OrderEntry::Quantity minimum_size;
    OrderEntry::Quantity maximum_size;
    OrderEntry::Side side = OrderEntry::Side::Sell;
    OrderEntry::Quantity size = 0;
 
    inline void sell_order() {
        auto volume = receiver.get_book().volume_buy_best();
        if (volume == 0) return;
        if (volume > size) volume = size;
        // std::cout << "placing sell order for " << volume << " shares" << std::endl;
        // cast volume to order entry because it is normally a larger type.
        // it is guaranteed within range clamping with size above
        client.send<OrderEntry::Messages::OrderRequest>(
            OrderEntry::Messages::ORDER_PRICE_MARKET,
            static_cast<OrderEntry::Quantity>(volume),
            OrderEntry::Side::Sell
        );
        size -= volume;
        // std::cout << size << " shares left in todays order quantity" << std::endl;
    }
 
    inline void buy_order() {
        auto volume = receiver.get_book().volume_sell_best();
        if (volume == 0) return;
        if (volume > size) volume = size;
        // std::cout << "placing buy order for " << volume << " shares" << std::endl;
        // cast volume to order entry because it is normally a larger type.
        // it is guaranteed within range clamping with size above
        client.send<OrderEntry::Messages::OrderRequest>(
            OrderEntry::Messages::ORDER_PRICE_MARKET,
            static_cast<OrderEntry::Quantity>(volume),
            OrderEntry::Side::Buy
        );
        size -= volume;
        // std::cout << size << " shares left in todays order quantity" << std::endl;
    }
 
    inline void start_strategy() {
        timer.expires_after(std::chrono::milliseconds(sleep_time));
        timer.async_wait([this](const std::error_code& error) {
            if (error) {  // TODO: handle error code
                std::cout << "LiquidityConsumer::start_strategy - " << error << std::endl;
                return;
            }
            if (Maths::Probability::boolean(P_act)) do_strategy();
            start_strategy();
        });
    }
 
    void do_strategy() {
        // make an order based on the agent's side for the day
        switch (side) {
            case OrderEntry::Side::Sell: { sell_order(); break; }
            case OrderEntry::Side::Buy:  { buy_order();  break; }
        }
    }
 
 public:
    LiquidityConsumer(
        asio::io_context& feed_context,
        asio::io_context& context,
        nlohmann::json options
    ) :
        receiver(
            feed_context,
            asio::ip::make_address(options["data_feed"]["listen"].get<std::string>()),
            asio::ip::make_address(options["data_feed"]["group"].get<std::string>()),
            options["data_feed"]["port"].get<uint16_t>(),
            *this
        ),
        client(
            context,
            options["order_entry"]["host"].get<std::string>(),
            std::to_string(options["order_entry"]["port"].get<uint16_t>())
        ),
        timer(context),
        sleep_time(options["strategy"]["sleep_time"].get<uint32_t>()),
        P_act(options["strategy"]["P_act"].get<double>()),
        is_running(false),
        minimum_size(options["strategy"]["minimum_size"].get<double>()),
        maximum_size(options["strategy"]["maximum_size"].get<double>()) {
            // login to the order entry client
            auto username = OrderEntry::make_username(options["order_entry"]["username"].get<std::string>());
            auto password = OrderEntry::make_password(options["order_entry"]["password"].get<std::string>());
            client.send<OrderEntry::Messages::LoginRequest>(username, password);
        }
 
    inline void did_receive(DataFeedReceiver* receiver, const DataFeed::Messages::StartOfSession& message) {
        if (is_running) {
            std::cerr << "received start of session when already running" << std::endl;
            return;
        }
        // std::cout << "trading session started" << std::endl;
        // select a random side for the day's orders
        side = Maths::Probability::boolean() ? OrderEntry::Side::Buy : OrderEntry::Side::Sell;
        // std::cout << "placing " << side << " orders today" << std::endl;
        size = Maths::Probability::uniform_int(minimum_size, maximum_size);
        // std::cout << "ordering " << size << " shares today" << std::endl;
        // start the strategy
        start_strategy();
        is_running = true;
    }
 
    inline void did_receive(DataFeedReceiver* receiver, const DataFeed::Messages::EndOfSession& message) {
        if (not is_running) {
            std::cerr << "received end of session when not running" << std::endl;
            return;
        }
        // stop the strategy
        timer.cancel();
        is_running = false;
        // std::cout << "trading session ended" << std::endl;
    }
 
    inline void did_receive(DataFeedReceiver* receiver, const DataFeed::Messages::Clear& message) { }
 
    inline void did_receive(DataFeedReceiver* receiver, const DataFeed::Messages::AddOrder& message) { }
 
    inline void did_receive(DataFeedReceiver* receiver, const DataFeed::Messages::DeleteOrder& message) { }
 
    inline void did_receive(DataFeedReceiver* receiver, const DataFeed::Messages::Trade& message) { }
};
 
}  // namespace Strategies
 
#endif  // STRATEGIES_LIQUIDITY_CONSUMER_HPP