mirror of
https://github.com/matrix-construct/construct
synced 2024-08-19 16:14:43 +02:00
527 lines
10 KiB
C++
527 lines
10 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include <RB_INC_MAGIC_H
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#include <boost/filesystem.hpp>
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#include <ircd/asio.h>
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#ifdef IRCD_USE_AIO
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#include "aio.h"
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#endif
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namespace ircd::fs
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{
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using namespace boost::filesystem;
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enum { NAME, PATH };
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using ent = std::pair<std::string, std::string>;
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extern const std::array<ent, num_of<index>()> paths;
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}
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namespace ircd::fs::magic
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{
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static void init();
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static void fini();
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}
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/// Non-null when aio is available for use
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decltype(ircd::fs::aioctx)
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ircd::fs::aioctx
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{};
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decltype(ircd::fs::paths)
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ircd::fs::paths
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{{
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{ "prefix", DPATH },
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{ "binary dir", BINPATH },
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{ "config", ETCPATH },
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{ "log", LOGPATH },
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{ "libexec dir", PKGLIBEXECDIR },
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{ "modules", MODPATH },
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{ "ircd.conf", CPATH },
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{ "ircd binary", SPATH },
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{ "db", DBPATH },
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}};
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ircd::fs::init::init()
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{
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magic::init();
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#ifdef IRCD_USE_AIO
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assert(!aioctx);
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aioctx = new aio{};
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#else
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log::warning
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{
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"No support for asynchronous local filesystem IO..."
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};
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#endif
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}
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ircd::fs::init::~init()
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noexcept
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{
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#ifdef IRCD_USE_AIO
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delete aioctx;
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aioctx = nullptr;
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#endif
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assert(!aioctx);
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magic::fini();
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// fs/read.h
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//
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namespace ircd::fs
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{
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string_view read__std(const string_view &path, const mutable_buffer &, const read_opts &);
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std::string read__std(const string_view &path, const read_opts &);
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}
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ircd::fs::read_opts
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const ircd::fs::read_opts_default
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{};
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//
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// ircd::fs interface linkage
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//
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std::string
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ircd::fs::read(const string_view &path,
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const read_opts &opts)
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{
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#ifdef IRCD_USE_AIO
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if(likely(aioctx))
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return read__aio(path, opts);
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#endif
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return read__std(path, opts);
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}
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ircd::string_view
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ircd::fs::read(const string_view &path,
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const mutable_buffer &buf,
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const read_opts &opts)
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{
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#ifdef IRCD_USE_AIO
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if(likely(aioctx))
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return read__aio(path, buf, opts);
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#endif
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return read__std(path, buf, opts);
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}
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//
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// std read
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//
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std::string
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ircd::fs::read__std(const string_view &path,
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const read_opts &opts)
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{
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std::ifstream file{std::string{path}};
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std::noskipws(file);
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std::istream_iterator<char> b{file};
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std::istream_iterator<char> e{};
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return std::string{b, e};
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}
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ircd::string_view
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ircd::fs::read__std(const string_view &path,
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const mutable_buffer &buf,
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const read_opts &opts)
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{
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std::ifstream file{std::string{path}};
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file.exceptions(file.failbit | file.badbit);
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file.seekg(opts.offset, file.beg);
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file.read(data(buf), size(buf));
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return
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{
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data(buf), size_t(file.gcount())
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// fs/write.h
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//
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namespace ircd::fs
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{
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string_view write__std(const string_view &path, const const_buffer &, const write_opts &);
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}
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ircd::fs::write_opts
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const ircd::fs::write_opts_default
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{};
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ircd::string_view
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ircd::fs::write(const string_view &path,
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const const_buffer &buf,
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const write_opts &opts)
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{
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#ifdef IRCD_USE_AIO
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if(likely(aioctx))
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return write__aio(path, buf, opts);
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#endif
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return write__std(path, buf, opts);
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}
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ircd::string_view
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ircd::fs::write__std(const string_view &path,
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const const_buffer &buf,
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const write_opts &opts)
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{
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const auto open_mode
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{
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opts.append?
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std::ios::app:
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opts.overwrite?
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std::ios::trunc:
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std::ios::out
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};
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std::ofstream file
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{
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std::string{path}, open_mode
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};
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file.seekp(opts.offset, file.beg);
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file.write(data(buf), size(buf));
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return buf;
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}
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void
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ircd::fs::chdir(const std::string &path)
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try
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{
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fs::current_path(path);
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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bool
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ircd::fs::mkdir(const std::string &path)
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try
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{
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return fs::create_directory(path);
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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std::string
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ircd::fs::cwd()
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try
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{
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return fs::current_path().string();
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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std::vector<std::string>
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ircd::fs::ls_recursive(const std::string &path)
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try
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{
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const fs::recursive_directory_iterator end;
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fs::recursive_directory_iterator it(path);
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std::vector<std::string> ret;
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std::transform(it, end, std::back_inserter(ret), []
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(const auto &ent)
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{
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return ent.path().string();
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});
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return ret;
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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std::vector<std::string>
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ircd::fs::ls(const std::string &path)
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try
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{
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static const fs::directory_iterator end;
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fs::directory_iterator it(path);
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std::vector<std::string> ret;
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std::transform(it, end, std::back_inserter(ret), []
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(const auto &ent)
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{
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return ent.path().string();
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});
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return ret;
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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size_t
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ircd::fs::size(const string_view &path)
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{
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return ircd::fs::size(std::string{path});
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}
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size_t
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ircd::fs::size(const std::string &path)
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{
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return fs::file_size(path);
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}
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bool
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ircd::fs::is_reg(const std::string &path)
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try
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{
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return fs::is_regular_file(path);
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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bool
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ircd::fs::is_dir(const std::string &path)
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try
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{
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return fs::is_directory(path);
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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bool
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ircd::fs::exists(const std::string &path)
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try
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{
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return boost::filesystem::exists(path);
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}
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catch(const fs::filesystem_error &e)
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{
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throw filesystem_error("%s", e.what());
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}
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std::string
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ircd::fs::make_path(const std::initializer_list<std::string> &list)
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{
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fs::path ret;
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for(const auto &s : list)
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ret /= fs::path(s);
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return ret.string();
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}
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const char *
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ircd::fs::get(index index)
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noexcept try
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{
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return std::get<PATH>(paths.at(index)).c_str();
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}
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catch(const std::out_of_range &e)
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{
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return nullptr;
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}
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const char *
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ircd::fs::name(index index)
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noexcept try
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{
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return std::get<NAME>(paths.at(index)).c_str();
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}
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catch(const std::out_of_range &e)
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{
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return nullptr;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// fs/magic.h
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//
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namespace ircd::fs::magic
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{
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magic_t cookie;
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// magic_getflags() may not be available; this will supplement for our
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// tracking of their flags state.
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int flags{MAGIC_NONE};
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static void throw_on_error(const magic_t &);
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static void set_flags(const magic_t &, const int &flags);
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static string_view call(const magic_t &, const int &flags, const mutable_buffer &, const std::function<const char *()> &);
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static string_view call(const magic_t &, const int &flags, const mutable_buffer &, const const_buffer &);
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}
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void
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ircd::fs::magic::init()
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{
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if(unlikely(!(cookie = ::magic_open(flags))))
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throw error{"magic_open() failed"};
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//TODO: conf; TODO: windows
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static const char *const paths[]
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{
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"/usr/local/share/misc/magic.mgc",
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"/usr/share/misc/magic.mgc",
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nullptr
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};
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for(const char *const *path{paths}; *path; ++path)
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if(magic_check(cookie, *path) == 0)
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if(magic_load(cookie, *path) == 0)
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return;
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throw error
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{
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"Failed to open any magic database"
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};
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}
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void
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ircd::fs::magic::fini()
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{
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::magic_close(cookie);
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}
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ircd::string_view
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ircd::fs::magic::description(const mutable_buffer &out,
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const const_buffer &buffer)
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{
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return call(cookie, MAGIC_NONE, out, buffer);
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}
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ircd::string_view
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ircd::fs::magic::extensions(const mutable_buffer &out,
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const const_buffer &buffer)
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{
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return call(cookie, MAGIC_EXTENSION, out, buffer);
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}
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ircd::string_view
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ircd::fs::magic::mime_encoding(const mutable_buffer &out,
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const const_buffer &buffer)
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{
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return call(cookie, MAGIC_MIME_ENCODING, out, buffer);
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}
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ircd::string_view
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ircd::fs::magic::mime_type(const mutable_buffer &out,
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const const_buffer &buffer)
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{
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return call(cookie, MAGIC_MIME_TYPE, out, buffer);
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}
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ircd::string_view
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ircd::fs::magic::mime(const mutable_buffer &out,
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const const_buffer &buffer)
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{
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return call(cookie, MAGIC_MIME, out, buffer);
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}
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ircd::string_view
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ircd::fs::magic::call(const magic_t &cookie,
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const int &flags,
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const mutable_buffer &out,
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const const_buffer &buffer)
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{
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return call(cookie, flags, out, [&cookie, &buffer]
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{
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return magic_buffer(cookie, data(buffer), size(buffer));
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});
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}
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ircd::string_view
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ircd::fs::magic::call(const magic_t &cookie,
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const int &ours,
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const mutable_buffer &out,
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const std::function<const char *()> &closure)
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{
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const auto &theirs{magic::flags};
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const unwind reset{[&theirs, &cookie]
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{
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set_flags(cookie, theirs);
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}};
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set_flags(cookie, ours);
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string_view str
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{
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closure()
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};
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if(!str)
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{
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throw_on_error(cookie);
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str = "application/octet-stream"_sv;
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}
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return { data(out), copy(out, str) };
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}
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void
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ircd::fs::magic::set_flags(const magic_t &cookie,
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const int &flags)
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{
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if(magic_setflags(cookie, flags) == -1)
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throw_on_error(cookie);
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}
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void
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ircd::fs::magic::throw_on_error(const magic_t &cookie)
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{
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const char *const errstr
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{
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::magic_error(cookie)
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};
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if(errstr)
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throw error
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{
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"%s", errstr
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};
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assert(magic_errno(cookie) == 0);
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}
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int
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ircd::fs::magic::version()
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{
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return ::magic_version();
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}
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__attribute__((constructor))
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static void
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ircd_fs_magic_version_check()
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{
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if(unlikely(MAGIC_VERSION != ircd::fs::magic::version()))
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{
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fprintf(stderr, "FATAL: linked libmagic version %d != compiled magic.h version %d.\n",
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ircd::fs::magic::version(),
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MAGIC_VERSION);
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std::terminate();
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}
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}
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