Inside Bitcoin

1// Copyright (c) The Bitcoin Core developers
2// Distributed under the MIT software license, see the accompanying
3// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5#include <calculator.h>
6#include <init.capnp.h>
7#include <init.capnp.proxy.h> // NOLINT(misc-include-cleaner) // IWYU pragma: keep
8
9#include <charconv>
10#include <cstring>
11#include <fstream>
12#include <functional>
13#include <iostream>
14#include <kj/async.h>
15#include <kj/common.h>
16#include <kj/memory.h>
17#include <memory>
18#include <mp/proxy-io.h>
19#include <stdexcept>
20#include <string>
21#include <system_error>
22#include <utility>
23
24class CalculatorImpl : public Calculator
25{
26public:
27    CalculatorImpl(std::unique_ptr<Printer> printer) : m_printer(std::move(printer)) {}
28    void solveEquation(const std::string& eqn) override { m_printer->print("Wow " + eqn + ", that's a tough one.\n"); }
29    std::unique_ptr<Printer> m_printer;
30};
31
32class InitImpl : public Init
33{
34public:
35    std::unique_ptr<Calculator> makeCalculator(std::unique_ptr<Printer> printer) override
36    {
37        return std::make_unique<CalculatorImpl>(std::move(printer));
38    }
39};
40
41// Exercises deprecated log callback signature
42static void LogPrint(bool raise, const std::string& message)
43{
44    if (raise) throw std::runtime_error(message);
45    std::ofstream("debug.log", std::ios_base::app) << message << std::endl;
46}
47
48int main(int argc, char** argv)
49{
50    if (argc != 2) {
51        std::cout << "Usage: mpcalculator <fd>\n";
52        return 1;
53    }
54    int fd;
55    if (std::from_chars(argv[1], argv[1] + strlen(argv[1]), fd).ec != std::errc{}) {
56        std::cerr << argv[1] << " is not a number or is larger than an int\n";
57        return 1;
58    }
59    mp::EventLoop loop("mpcalculator", LogPrint);
60    std::unique_ptr<Init> init = std::make_unique<InitImpl>();
61    mp::ServeStream<InitInterface>(loop, fd, *init);
62    loop.loop();
63    return 0;
64}
65