run_command.cpp

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// Copyright (c) 2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
 
#include <common/run_command.h>
 
#include <tinyformat.h>
#include <univalue.h>
 
#ifdef ENABLE_EXTERNAL_SIGNER
#include <boost/process.hpp>
#endif // ENABLE_EXTERNAL_SIGNER
 
UniValue RunCommandParseJSON(const std::string& str_command, const std::string& str_std_in)
{
#ifdef ENABLE_EXTERNAL_SIGNER
    namespace bp = boost::process;
 
    UniValue result_json;
    bp::opstream stdin_stream;
    bp::ipstream stdout_stream;
    bp::ipstream stderr_stream;
 
    if (str_command.empty()) return UniValue::VNULL;
 
    bp::child c(
        str_command,
        bp::std_out > stdout_stream,
        bp::std_err > stderr_stream,
        bp::std_in < stdin_stream
    );
    if (!str_std_in.empty()) {
        stdin_stream << str_std_in << std::endl;
    }
    stdin_stream.pipe().close();
 
    std::string result;
    std::string error;
    std::getline(stdout_stream, result);
    std::getline(stderr_stream, error);
 
    c.wait();
    const int n_error = c.exit_code();
    if (n_error) throw std::runtime_error(strprintf("RunCommandParseJSON error: process(%s) returned %d: %s\n", str_command, n_error, error));
    if (!result_json.read(result)) throw std::runtime_error("Unable to parse JSON: " + result);
 
    return result_json;
#else
    throw std::runtime_error("Compiled without external signing support (required for external signing).");
#endif // ENABLE_EXTERNAL_SIGNER
}