mirror of
https://github.com/matrix-construct/construct
synced 2024-10-31 19:08:59 +01:00
889 lines
17 KiB
C++
889 lines
17 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 <boost/filesystem.hpp>
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#include <boost/dll.hpp>
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namespace filesystem = boost::filesystem;
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namespace load_mode = boost::dll::load_mode;
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#include <ircd/asio.h>
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#include <ircd/mods/mapi.h> // Module's internal API
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#include "mods.h"
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ircd::log::log
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ircd::mods::log
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{
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"modules", 'M'
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};
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const filesystem::path
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ircd::mods::suffix
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{
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boost::dll::shared_library::suffix()
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// mods/mods.h (misc util)
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//
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std::forward_list<std::string>
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ircd::mods::available()
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{
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using filesystem::path;
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using filesystem::directory_iterator;
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std::forward_list<std::string> ret;
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for(const auto &dir : paths) try
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{
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for(directory_iterator it(dir); it != directory_iterator(); ++it)
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if(is_module(it->path(), std::nothrow))
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ret.emplace_front(unpostfixed(relative(it->path(), dir).string()));
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}
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catch(const filesystem::filesystem_error &e)
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{
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log::warning
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{
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log, "Module path [%s]: %s",
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dir,
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e.what()
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};
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continue;
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}
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return ret;
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}
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filesystem::path
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ircd::mods::fullpath(const string_view &name)
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{
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std::vector<std::string> why;
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const filesystem::path path(search(name, why));
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if(path.empty())
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{
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for(const auto &str : why)
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log::error
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{
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log, "candidate for module '%s' failed: %s",
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name,
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str
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};
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throw error
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{
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"No valid module by name `%s'", name
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};
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}
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return path;
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}
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std::string
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ircd::mods::search(const string_view &name)
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{
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std::vector<std::string> why;
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return search(name, why);
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}
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std::string
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ircd::mods::search(const string_view &name,
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std::vector<std::string> &why)
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{
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using filesystem::path;
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const path path
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{
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postfixed(name)
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};
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if(!path.is_relative())
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{
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why.resize(why.size() + 1);
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return is_module(path, why.back())?
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std::string{name}:
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std::string{};
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}
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else for(const auto &dir : paths)
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{
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why.resize(why.size() + 1);
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if(is_module(dir/path, why.back()))
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return (dir/path).string();
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}
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return {};
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}
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bool
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ircd::mods::is_module(const string_view &fullpath)
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{
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return is_module(filesystem::path(std::string{fullpath}));
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}
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bool
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ircd::mods::is_module(const string_view &fullpath,
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std::nothrow_t)
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{
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return is_module(filesystem::path(std::string{fullpath}), std::nothrow);
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}
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bool
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ircd::mods::is_module(const string_view &fullpath,
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std::string &why)
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{
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return is_module(filesystem::path(std::string{fullpath}), why);
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}
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bool
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ircd::mods::is_module(const filesystem::path &path,
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std::nothrow_t)
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try
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{
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return is_module(path);
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}
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catch(const std::exception &e)
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{
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return false;
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}
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bool
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ircd::mods::is_module(const filesystem::path &path,
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std::string &why)
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try
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{
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return is_module(path);
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}
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catch(const std::exception &e)
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{
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why = e.what();
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return false;
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}
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bool
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ircd::mods::is_module(const filesystem::path &path)
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{
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const auto syms(symbols(path));
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const auto &header_name(mapi::header_symbol_name);
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const auto it(std::find(begin(syms), end(syms), header_name));
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if(it == end(syms))
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throw error
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{
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"`%s': has no MAPI header (%s)", path.string(), header_name
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};
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return true;
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}
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bool
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ircd::mods::available(const string_view &name)
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{
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using filesystem::path;
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std::vector<std::string> why;
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return !search(name, why).empty();
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}
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bool
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ircd::mods::loaded(const string_view &name)
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{
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return mod::loaded.count(name);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// mods/import.h
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//
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decltype(ircd::mods::imports)
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ircd::mods::imports
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{};
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///////////////////////////////////////////////////////////////////////////////
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//
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// mods/sym_ptr.h
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//
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ircd::mods::sym_ptr::sym_ptr(const string_view &modname,
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const string_view &symname)
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:sym_ptr
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{
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module(modname), symname
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}
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{
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}
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ircd::mods::sym_ptr::sym_ptr(mod &mod,
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const string_view &symname)
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:sym_ptr
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{
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module(shared_from(mod)), symname
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}
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{
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}
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ircd::mods::sym_ptr::sym_ptr(module module,
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const string_view &symname)
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:std::weak_ptr<mod>
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{
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module
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}
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,ptr{[this, &module, &symname]
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{
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if(unlikely(!module.has(symname)))
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throw undefined_symbol
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{
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"Could not find symbol '%s' (%s) in module '%s'",
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demangle(symname),
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symname,
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module.name()
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};
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return module.ptr(symname);
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}()}
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{
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// mods/module.h
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//
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ircd::mods::module::module(const string_view &name)
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try
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:std::shared_ptr<mod>{[&name]
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{
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// Search for loaded module and increment the reference counter for this handle if loaded.
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auto it(mod::loaded.find(name));
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if(it != end(mod::loaded))
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{
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auto &mod(*it->second);
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return shared_from(mod);
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}
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static const load_mode::type flags
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{
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load_mode::rtld_local |
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load_mode::rtld_now
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};
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const auto path(fullpath(name));
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log::debug
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{
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log, "Attempting to load '%s' @ `%s'",
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name,
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path.string()
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};
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const auto ret
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{
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std::make_shared<mod>(path, flags)
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};
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// Call the user-supplied init function well after fully loading and
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// construction of the module. This way the init function sees the module
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// as loaded and can make shared_ptr references, etc.
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if(ret->header->init)
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ret->header->init();
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log::info
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{
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log, "Loaded module %s v%u \"%s\"",
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ret->name(),
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ret->header->version,
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!ret->description().empty()?
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ret->description():
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"<no description>"_sv
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};
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return ret;
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}()}
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{
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}
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catch(const std::exception &e)
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{
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log::error
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{
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log, "Failed to load '%s': %s",
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name,
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e.what()
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};
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}
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ircd::string_view
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ircd::mods::module::path()
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const
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{
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const mod &mod(*this);
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return mods::path(mod);
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}
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ircd::string_view
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ircd::mods::module::name()
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const
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{
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const mod &mod(*this);
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return mods::name(mod);
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}
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bool
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ircd::mods::module::has(const string_view &name)
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const
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{
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const mod &mod(*this);
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return mods::has(mod, name);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// mods/symbols.h
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//
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std::vector<std::string>
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ircd::mods::find_symbol(const string_view &symbol)
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{
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std::vector<std::string> ret;
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const auto av(available());
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std::copy_if(begin(av), end(av), std::back_inserter(ret), [&symbol]
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(const auto &name)
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{
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return has_symbol(name, symbol);
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});
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return ret;
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}
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bool
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ircd::mods::has_symbol(const string_view &name,
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const string_view &symbol)
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{
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const auto path(fullpath(name));
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if(path.empty())
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return false;
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const auto syms(symbols(path));
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return std::find(begin(syms), end(syms), symbol) != end(syms);
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}
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std::unordered_map<std::string, std::string>
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ircd::mods::mangles(const string_view &fullpath)
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{
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return mangles(filesystem::path(std::string{fullpath}));
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}
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std::unordered_map<std::string, std::string>
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ircd::mods::mangles(const string_view &fullpath,
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const string_view §ion)
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{
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return mangles(filesystem::path(std::string{fullpath}), section);
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}
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std::unordered_map<std::string, std::string>
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ircd::mods::mangles(const filesystem::path &path)
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{
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return mangles(mods::symbols(path));
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}
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std::unordered_map<std::string, std::string>
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ircd::mods::mangles(const filesystem::path &path,
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const string_view §ion)
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{
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return mangles(mods::symbols(path, section));
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}
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std::unordered_map<std::string, std::string>
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ircd::mods::mangles(const std::vector<std::string> &symbols)
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{
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std::unordered_map<std::string, std::string> ret;
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for(const auto &sym : symbols) try
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{
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ret.emplace(demangle(sym), sym);
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}
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catch(const not_mangled &e)
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{
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ret.emplace(sym, sym);
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}
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return ret;
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}
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std::vector<std::string>
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ircd::mods::symbols(const string_view &fullpath)
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{
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return symbols(filesystem::path(std::string{fullpath}));
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}
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std::vector<std::string>
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ircd::mods::symbols(const string_view &fullpath,
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const string_view §ion)
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{
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return symbols(filesystem::path(std::string{fullpath}), std::string{section});
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}
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std::vector<std::string>
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ircd::mods::symbols(const filesystem::path &path)
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{
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return info<std::vector<std::string>>(path, []
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(boost::dll::library_info &info)
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{
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return info.symbols();
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});
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}
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std::vector<std::string>
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ircd::mods::symbols(const filesystem::path &path,
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const string_view §ion)
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{
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return info<std::vector<std::string>>(path, [§ion]
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(boost::dll::library_info &info)
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{
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return info.symbols(std::string{section});
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});
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}
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std::vector<std::string>
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ircd::mods::sections(const string_view &fullpath)
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{
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return sections(filesystem::path(std::string{fullpath}));
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}
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std::vector<std::string>
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ircd::mods::sections(const filesystem::path &path)
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{
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return info<std::vector<std::string>>(path, []
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(boost::dll::library_info &info)
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{
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return info.sections();
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});
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}
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template<class R,
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class F>
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R
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ircd::mods::info(const filesystem::path &path,
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F&& closure)
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{
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if(!exists(path))
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throw filesystem_error
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{
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"`%s' does not exist", path.string()
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};
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if(!is_regular_file(path))
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throw filesystem_error
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{
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"`%s' is not a file", path.string()
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};
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boost::dll::library_info info(path);
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return closure(info);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// mods/paths.h
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//
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namespace ircd::mods
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{
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extern const filesystem::path modroot;
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}
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decltype(ircd::mods::modroot)
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ircd::mods::modroot
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{
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std::string{ircd::fs::get(ircd::fs::MODULES)}
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};
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decltype(ircd::mods::paths)
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ircd::mods::paths
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{};
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std::string
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ircd::mods::unpostfixed(const string_view &name)
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{
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return unpostfixed(std::string{name});
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}
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std::string
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ircd::mods::unpostfixed(std::string name)
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{
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return unpostfixed(filesystem::path(std::move(name))).string();
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}
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std::string
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ircd::mods::postfixed(const string_view &name)
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{
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return postfixed(std::string{name});
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}
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std::string
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ircd::mods::postfixed(std::string name)
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{
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return postfixed(filesystem::path(std::move(name))).string();
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}
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filesystem::path
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ircd::mods::unpostfixed(const filesystem::path &path)
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{
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if(extension(path) != suffix)
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return path;
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return filesystem::path(path).replace_extension();
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}
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filesystem::path
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ircd::mods::postfixed(const filesystem::path &path)
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{
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if(extension(path) == suffix)
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return path;
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filesystem::path ret(path);
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return ret += suffix;
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}
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filesystem::path
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ircd::mods::prefix_if_relative(const filesystem::path &path)
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{
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return path.is_relative()? (modroot / path) : path;
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}
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//
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// paths::paths
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//
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ircd::mods::paths::paths()
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:std::vector<std::string>
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{{
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modroot.string()
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}}
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{
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}
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bool
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ircd::mods::paths::add(const string_view &dir)
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{
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using filesystem::path;
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const path path
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{
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prefix_if_relative(std::string{dir})
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};
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if(!exists(path))
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throw filesystem_error
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{
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"path `%s' (%s) does not exist", dir, path.string()
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};
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if(!is_directory(path))
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throw filesystem_error
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{
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"path `%s' (%s) is not a directory", dir, path.string()
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};
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if(added(dir))
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return false;
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emplace(begin(), dir);
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return true;
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}
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bool
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ircd::mods::paths::add(const string_view &dir,
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std::nothrow_t)
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try
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{
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return add(dir);
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}
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catch(const std::exception &e)
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{
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log::error
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{
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log, "Failed to add path: %s", e.what()
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};
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return false;
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}
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bool
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ircd::mods::paths::del(const string_view &dir)
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{
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std::remove(begin(), end(), prefix_if_relative(std::string{dir}).string());
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return true;
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}
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bool
|
|
ircd::mods::paths::added(const string_view &dir)
|
|
const
|
|
{
|
|
return std::find(begin(), end(), dir) != end();
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// mods/mods.h
|
|
//
|
|
|
|
template<> uint8_t *
|
|
ircd::mods::ptr<uint8_t>(mod &mod,
|
|
const string_view &sym)
|
|
{
|
|
return &mod.handle.get<uint8_t>(std::string{sym});
|
|
}
|
|
|
|
template<>
|
|
const uint8_t *
|
|
ircd::mods::ptr<const uint8_t>(const mod &mod,
|
|
const string_view &sym)
|
|
{
|
|
return &mod.handle.get<const uint8_t>(std::string{sym});
|
|
}
|
|
|
|
bool
|
|
ircd::mods::has(const mod &mod,
|
|
const string_view &name)
|
|
{
|
|
return mod.handle.has(std::string{name});
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::mods::name(const mod &mod)
|
|
{
|
|
return mod.name();
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::mods::path(const mod &mod)
|
|
{
|
|
return mod.location();
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (internal) mods.h
|
|
//
|
|
|
|
decltype(ircd::mods::mod::loading)
|
|
ircd::mods::mod::loading
|
|
{};
|
|
|
|
decltype(ircd::mods::mod::loaded)
|
|
ircd::mods::mod::loaded
|
|
{};
|
|
|
|
ircd::mods::mod::mod(const filesystem::path &path,
|
|
const load_mode::type &mode)
|
|
try
|
|
:path{path}
|
|
,mode{mode}
|
|
//,mangles{mods::mangles(path)}
|
|
,handle{[this, &path, &mode]
|
|
{
|
|
const auto theirs
|
|
{
|
|
std::get_terminate()
|
|
};
|
|
|
|
const auto ours([]
|
|
{
|
|
log::critical
|
|
{
|
|
log, "std::terminate() called during the static construction of a module."
|
|
};
|
|
|
|
if(std::current_exception()) try
|
|
{
|
|
std::rethrow_exception(std::current_exception());
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::error
|
|
{
|
|
log, "%s", e.what()
|
|
};
|
|
}
|
|
});
|
|
|
|
const unwind reset{[this, &theirs]
|
|
{
|
|
assert(loading.top() == this);
|
|
loading.pop();
|
|
std::set_terminate(theirs);
|
|
}};
|
|
|
|
loading.push(this);
|
|
std::set_terminate(ours);
|
|
return boost::dll::shared_library{path, mode};
|
|
}()}
|
|
,_name
|
|
{
|
|
unpostfixed(handle.location().filename().string())
|
|
}
|
|
,_location
|
|
{
|
|
handle.location().string()
|
|
}
|
|
,header
|
|
{
|
|
&handle.get<mapi::header>(mapi::header_symbol_name)
|
|
}
|
|
{
|
|
log::debug
|
|
{
|
|
log, "Loaded static segment of '%s' @ `%s' with %zu symbols",
|
|
name(),
|
|
location(),
|
|
mangles.size()
|
|
};
|
|
|
|
if(unlikely(!header))
|
|
throw error
|
|
{
|
|
"Unexpected null header"
|
|
};
|
|
|
|
if(header->magic != mapi::MAGIC)
|
|
throw error
|
|
{
|
|
"Bad magic [%04x] need: [%04x]", header->magic, mapi::MAGIC
|
|
};
|
|
|
|
// Tell the module where to find us.
|
|
header->self = this;
|
|
|
|
// Set some basic metadata
|
|
auto &meta(header->meta);
|
|
meta["name"] = name();
|
|
meta["location"] = location();
|
|
|
|
if(!loading.empty())
|
|
{
|
|
const auto &m(mod::loading.top());
|
|
m->children.emplace_back(this);
|
|
log::debug
|
|
{
|
|
log, "Module '%s' recursively loaded by '%s'",
|
|
name(),
|
|
m->path.filename().string()
|
|
};
|
|
}
|
|
|
|
// Without init exception, the module is now considered loaded.
|
|
assert(!loaded.count(name()));
|
|
loaded.emplace(name(), this);
|
|
}
|
|
catch(const boost::system::system_error &e)
|
|
{
|
|
switch(e.code().value())
|
|
{
|
|
case boost::system::errc::bad_file_descriptor:
|
|
{
|
|
const string_view what(e.what());
|
|
const auto pos(what.find("undefined symbol: "));
|
|
if(pos == std::string_view::npos)
|
|
break;
|
|
|
|
const string_view msg(what.substr(pos));
|
|
const std::string mangled(between(msg, ": ", ")"));
|
|
const std::string demangled(demangle(mangled));
|
|
throw error
|
|
{
|
|
"undefined symbol: '%s' (%s)", demangled, mangled
|
|
};
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
throw error
|
|
{
|
|
"%s", string(e)
|
|
};
|
|
}
|
|
|
|
// Allows module to communicate static destruction is taking place when mapi::header
|
|
// destructs. If dlclose() returns without this being set, dlclose() lied about really
|
|
// unloading the module. That is considered a "stuck" module.
|
|
bool ircd::mapi::static_destruction;
|
|
|
|
ircd::mods::mod::~mod()
|
|
noexcept try
|
|
{
|
|
log::debug
|
|
{
|
|
log, "Attempting unload module '%s' @ `%s'",
|
|
name(),
|
|
location()
|
|
};
|
|
|
|
unload();
|
|
|
|
const size_t erased(loaded.erase(name()));
|
|
assert(erased == 1);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::critical
|
|
{
|
|
log, "Module @%p unload: %s",
|
|
(const void *)this,
|
|
e.what()
|
|
};
|
|
|
|
if(!ircd::debugmode)
|
|
return;
|
|
}
|
|
|
|
bool
|
|
ircd::mods::mod::unload()
|
|
{
|
|
if(!handle.is_loaded())
|
|
return false;
|
|
|
|
if(header->fini)
|
|
header->fini();
|
|
|
|
// Save the children! dlclose() does not like to be called recursively during static
|
|
// destruction of a module. The mod ctor recorded all of the modules loaded while this
|
|
// module was loading so we can reverse the record and unload them here.
|
|
// Note: If the user loaded more modules from inside their module they will have to dtor them
|
|
// before 'static destruction' does. They can also do that by adding them to this vector.
|
|
std::for_each(rbegin(this->children), rend(this->children), []
|
|
(mod *const &ptr)
|
|
{
|
|
if(shared_from(*ptr).use_count() <= 2)
|
|
ptr->unload();
|
|
});
|
|
|
|
log::debug
|
|
{
|
|
log, "Attempting static unload for '%s' @ `%s'",
|
|
name(),
|
|
location()
|
|
};
|
|
|
|
mapi::static_destruction = false;
|
|
handle.unload();
|
|
assert(!handle.is_loaded());
|
|
|
|
if(!mapi::static_destruction)
|
|
{
|
|
log.critical("Module \"%s\" is stuck and failing to unload.", name());
|
|
log.critical("Module \"%s\" may result in undefined behavior if not fixed.", name());
|
|
}
|
|
else log::info
|
|
{
|
|
log, "Unloaded '%s'", name()
|
|
};
|
|
|
|
return true;
|
|
}
|