utils.cpp

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#include "hal_core/utilities/utils.h"
 
#include "hal_core/utilities/log.h"
 
#include <algorithm>
#include <dirent.h>
#include <fstream>
#include <random>
#include <sstream>
#include <sys/stat.h>
#include <sys/types.h>
 
#ifdef _WIN32
#include <tchar.h>
#include <windows.h>
#elif __APPLE__ && __MACH__
 
#include <mach-o/dyld.h>
#include <unistd.h>
 
#elif __linux__
#include <stdlib.h>
#include <unistd.h>
#endif
 
namespace hal
{
    namespace utils
    {
        bool file_exists(const std::string& filename)
        {
            std::ifstream ifile(filename.c_str());
            return (bool)ifile;
        }
 
        bool folder_exists_and_is_accessible(const std::filesystem::path& folder)
        {
#ifdef _WIN32
            DWORD ftyp = GetFileAttributesA(folder.c_str());
            if (ftyp == INVALID_FILE_ATTRIBUTES)
            {
                return false;    //something is wrong with your path!
            }
 
            if (ftyp & FILE_ATTRIBUTE_DIRECTORY)
            {
                if (0 == access(folder.c_str(), R_OK))
                {
                    return true;
                }
            }
 
            return false;    // this is not a directory!
#else
 
            struct stat sb;
 
            if (stat(folder.c_str(), &sb) == 0 && S_ISDIR(sb.st_mode))
            {
                if (0 == access(folder.c_str(), R_OK))
                {
                    return true;
                }
            }
            return false;
#endif
        }
 
        std::filesystem::path get_binary_directory()
        {
            char buf[1024] = {0};
#ifdef _WIN32
            DWORD ret = GetModuleFileNameA(NULL, buf, sizeof(buf));
            if (ret == 0 || ret == sizeof(buf))
            {
                return std::string();
            }
            return std::filesystem::path(buf);
#elif __APPLE__ && __MACH__
            uint32_t size = sizeof(buf);
            int ret       = _NSGetExecutablePath(buf, &size);
            if (0 != ret)
            {
                return std::string();
            }
 
            hal::error_code ec;
            std::filesystem::path p(std::filesystem::canonical(buf, ec));
            return p.parent_path().make_preferred();
#elif __linux__
            ssize_t size = readlink("/proc/self/exe", buf, sizeof(buf));
            std::string path(buf, size);
            hal::error_code ec;
            auto p = std::filesystem::canonical(path, ec);
            return p.make_preferred().parent_path();
#endif
        }
 
        std::filesystem::path get_base_directory()
        {
            auto environ_path = std::getenv("HAL_BASE_PATH");
            if (environ_path)
            {
                return std::filesystem::path(environ_path).make_preferred();
            }
            hal::error_code ec;
            auto bin_dir = get_binary_directory();
            while (std::filesystem::exists(bin_dir))
            {
                if (std::filesystem::exists(bin_dir / "hal", ec))
                {
                    return bin_dir.parent_path();
                }
                if (!bin_dir.has_relative_path())
                {
                    break;
                }
                bin_dir = bin_dir.parent_path();
            }
            std::filesystem::path which_result = which("hal");
            if (!which_result.empty())
            {
                return which_result.parent_path().parent_path();
            }
            die("core", "Cannot determine base path of hal installation. Please set the environment variable HAL_BASE_PATH. Giving up!");
        }
 
        std::filesystem::path get_library_directory()
        {
            std::vector<std::filesystem::path> path_hints = {
                get_base_directory() / "lib/x86_64-linux-gnu",
                get_base_directory() / "lib64/",
                get_base_directory() / "lib/",
            };
 
            for (const auto& path : path_hints)
            {
                hal::error_code ec;
                if (std::filesystem::exists(path / "hal_plugins", ec))
                {
                    return path;
                }
            }
 
            return std::filesystem::path();
        }
 
        std::filesystem::path get_share_directory()
        {
            std::vector<std::filesystem::path> path_hints = {
                get_base_directory() / "share/hal",
            };
            return get_first_directory_exists(path_hints);
        }
 
        std::filesystem::path get_user_share_directory()
        {
            std::filesystem::path dir = std::filesystem::path(getenv("HOME")) / ".local/share/hal";
            std::filesystem::create_directories(dir);
            return dir;
        }
 
        std::filesystem::path get_config_directory()
        {
            std::vector<std::filesystem::path> path_hints = {
                get_base_directory() / "share/hal/defaults",
            };
            return get_first_directory_exists(path_hints);
        }
 
        std::filesystem::path get_user_config_directory()
        {
            std::filesystem::path dir = std::filesystem::path(getenv("HOME")) / ".config/hal";
            std::filesystem::create_directories(dir);
            return dir;
        }
 
        std::filesystem::path get_default_log_directory(std::filesystem::path source_file)
        {
            std::filesystem::path dir = (source_file.empty()) ? get_user_share_directory() / "log" : source_file.parent_path();
            std::filesystem::create_directories(dir);
            return dir;
        }
 
        std::vector<std::filesystem::path> get_gate_library_directories()
        {
            std::vector<std::filesystem::path> path_hints = {
                get_share_directory() / "gate_libraries",
                get_user_share_directory() / "gate_libraries",
            };
            return path_hints;
        }
 
        std::vector<std::filesystem::path> get_plugin_directories()
        {
            std::vector<std::filesystem::path> path_hints = {
 
                get_library_directory() / "hal_plugins/",
                get_library_directory() / "plugins/",
                get_user_share_directory() / "plugins/",
                std::filesystem::path(getenv("HOME")) / "plugins/",
            };
            return path_hints;
        }
 
        std::filesystem::path get_first_directory_exists(std::vector<std::filesystem::path> path_hints)
        {
            for (const auto& path : path_hints)
            {
                hal::error_code ec;
                if (std::filesystem::exists(path, ec))
                {
                    return path;
                }
            }
            return std::filesystem::path();
        }
 
        std::filesystem::path get_file(std::string file_name, std::vector<std::filesystem::path> path_hints)
        {
            if (file_name.empty())
            {
                return std::filesystem::path();
            }
 
            for (const auto& path : path_hints)
            {
                hal::error_code ec1;
                if (std::filesystem::exists(std::filesystem::path(path), ec1))
                {
                    std::filesystem::path file_path = std::filesystem::path(path) / std::filesystem::path(file_name).string();
                    hal::error_code ec2;
                    if (std::filesystem::exists(file_path, ec2))
                    {
                        return file_path;
                    }
                }
            }
            return std::filesystem::path();
        }
 
        std::filesystem::path which(const std::string& name, const std::string& path)
        {
            if (name.empty())
            {
                return std::filesystem::path();
            }
            std::string internal_path = path;
            if (internal_path.empty())
            {
                internal_path = std::getenv("PATH");
            }
#ifdef _WIN32
            const char which_delimiter = ';';
            return std::filesystem::path();    // Curerently no support for windows. Sorry ...
#else
            const char which_delimiter = ':';
#endif
            auto folders = split(internal_path, which_delimiter, false);
            for (const auto& folder : folders)
            {
                hal::error_code ec;
                UNUSED(ec);
                std::filesystem::path p = std::filesystem::path(folder) / name;
                struct stat sb;
 
                if (stat(p.c_str(), &sb) == 0 && sb.st_mode & S_IXUSR)
                {
                    return p;
                }
            }
            return std::filesystem::path();
        }
 
        Result<std::filesystem::path> get_unique_temp_directory(const std::string& prefix, const u32 max_attmeps)
        {
            const auto tmp_dir = std::filesystem::temp_directory_path();
 
            std::random_device dev;
            std::mt19937 prng(dev());
            std::uniform_int_distribution<uint64_t> rand(0);
 
            for (u32 i = 0; i < max_attmeps; i++)
            {
                std::stringstream ss;
                ss << std::setw(16) << std::setfill('0') << std::hex << rand(prng);
                std::filesystem::path tmp_path = tmp_dir / (prefix + ss.str());
 
                if (std::filesystem::create_directories(tmp_path))
                {
                    return OK(tmp_path);
                }
            }
 
            return ERR("failed to create unique temporary directory path");
        }
 
        std::string get_open_source_licenses()
        {
            return R"(pybind11 (https://github.com/pybind/pybind11):
Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>, All rights reserved.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 
3. Neither the name of the copyright holder nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
Please also refer to the file CONTRIBUTING.md, which clarifies licensing of
external contributions to this project including patches, pull requests, etc.
 
=================================================================================
 
rapidjson (https://github.com/Tencent/rapidjson):
 
Tencent is pleased to support the open source community by making RapidJSON
available.
 
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rights reserved.
 
If you have downloaded a copy of the RapidJSON binary from Tencent, please
note that the RapidJSON binary is licensed under the MIT License. If you have
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RapidJSON source code is licensed under the MIT License, except for the
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JSON license in your own projects, it's sufficient to exclude the
bin/jsonchecker/ directory, as it's the only code under the JSON license. A
copy of the MIT License is included in this file.
 
Other dependencies and licenses:
 
Open Source Software Licensed Under the BSD License:
--------------------------------------------------------------------
 
The msinttypes r29 Copyright (c) 2006-2013 Alexander Chemeris All rights
reserved.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of  copyright holder nor the names of its contributors may
  be used to endorse or promote products derived from this software without
  specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
Open Source Software Licensed Under the JSON License:
--------------------------------------------------------------------
 
json.org Copyright (c) 2002 JSON.org All Rights Reserved.
 
JSON_checker Copyright (c) 2002 JSON.org All Rights Reserved.
 
 
Terms of the JSON License:
---------------------------------------------------
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
The Software shall be used for Good, not Evil.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
 
Terms of the MIT License:
--------------------------------------------------------------------
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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=================================================================================
 
sanitizers-cmake (https://github.com/arsenm/sanitizers-cmake):
The MIT License (MIT)
 
Copyright (c)
    2013 Matthew Arsenault
    2015-2016 RWTH Aachen University, Federal Republic of Germany
 
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
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=================================================================================
 
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Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
 
=================================================================================
 
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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=================================================================================
 
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)";
        }
 
        Result<u64> wrapped_stoull(const std::string& s, const u32 base)
        {
            try
            {
                return OK(std::stoull(s, nullptr, base));
            }
            catch (const std::invalid_argument& e)
            {
                return ERR("could not get u64 from string '" + s + "': " + e.what());
            }
            catch (const std::out_of_range& e)
            {
                return ERR("could not get u64 from string '" + s + "': " + e.what());
            }
 
            return ERR("encountered unknown error");
        }
 
        Result<u32> wrapped_stoul(const std::string& s, const u32 base)
        {
            try
            {
                return OK((u32)std::stoul(s, nullptr, base));
            }
            catch (const std::invalid_argument& e)
            {
                return ERR("could not get u32 from string '" + s + "': " + e.what());
            }
            catch (const std::out_of_range& e)
            {
                return ERR("could not get u32 from string '" + s + "': " + e.what());
            }
 
            return ERR("encountered unknown error");
        }
 
    }    // namespace utils
}    // namespace hal