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/* Copyright (c) 2015 Stanislaw Halik
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#pragma once
#include "plugin-api.hpp"
#include "compat/library-path.hpp"
#include <memory>
#include <algorithm>
#include <cstring>
#include <QDebug>
#include <QString>
#include <QLibrary>
#include <QList>
#include <QDir>
#include <QList>
#include <QIcon>
extern "C" {
using module_ctor_t = void* (*)(void);
using module_metadata_t = Metadata_* (*)(void);
}
struct dylib final
{
enum Type : unsigned
{
Filter = 0xdeadbabe,
Tracker = 0xcafebeef,
Protocol = 0xdeadf00d,
Extension = 0xcafebabe,
Invalid = (unsigned)-1,
};
dylib(const QString& filename_, Type t) :
full_filename(filename_),
module_name(trim_filename(filename_))
{
// otherwise dlopen opens the calling executable
if (filename_.isEmpty() || module_name.isEmpty())
return;
handle.setFileName(filename_);
handle.setLoadHints(QLibrary::DeepBindHint | QLibrary::PreventUnloadHint | QLibrary::ResolveAllSymbolsHint);
#ifdef __clang__
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wcomma"
#endif
if (check(!handle.load()))
return;
if (check((Dialog = (module_ctor_t) handle.resolve("GetDialog"), !Dialog)))
return;
if (check((Constructor = (module_ctor_t) handle.resolve("GetConstructor"), !Constructor)))
return;
if (check((Meta = (module_metadata_t) handle.resolve("GetMetadata"), !Meta)))
return;
std::unique_ptr<Metadata_> m{Meta()};
icon = m->icon();
name = m->name();
type = t;
#ifdef __clang__
# pragma clang diagnostic pop
#endif
}
// QLibrary refcounts the .dll's so don't forcefully unload
~dylib() = default;
static QList<std::shared_ptr<dylib>> enum_libraries(const QString& library_path)
{
QDir module_directory(library_path);
QList<std::shared_ptr<dylib>> ret;
using str = QLatin1String;
const struct filter_ {
Type type{Invalid};
QLatin1String glob;
} filters[] = {
{ Filter, str(OPENTRACK_LIBRARY_PREFIX "opentrack-filter-*." OPENTRACK_LIBRARY_EXTENSION), },
{ Tracker, str(OPENTRACK_LIBRARY_PREFIX "opentrack-tracker-*." OPENTRACK_LIBRARY_EXTENSION), },
{ Protocol, str(OPENTRACK_LIBRARY_PREFIX "opentrack-proto-*." OPENTRACK_LIBRARY_EXTENSION), },
{ Extension, str(OPENTRACK_LIBRARY_PREFIX "opentrack-ext-*." OPENTRACK_LIBRARY_EXTENSION), },
};
for (const filter_& filter : filters)
{
for (const QString& filename : module_directory.entryList({ filter.glob }, QDir::Files, QDir::Name))
{
auto lib = std::make_shared<dylib>(QStringLiteral("%1/%2").arg(library_path, filename), filter.type);
if (lib->type == Invalid)
continue;
if (std::any_of(ret.cbegin(),
ret.cend(),
[&lib](const std::shared_ptr<dylib>& a) {
return a->type == lib->type && a->name == lib->name;
}))
{
qDebug() << "duplicate lib" << filename << "ident" << lib->name;
continue;
}
ret.push_back(lib);
}
}
return ret;
}
Type type{Invalid};
QString full_filename;
QString module_name;
QIcon icon;
QString name;
module_ctor_t Dialog{nullptr};
module_ctor_t Constructor{nullptr};
module_metadata_t Meta{nullptr};
private:
QLibrary handle;
static QString trim_filename(const QString& in_)
{
QStringRef in(&in_);
const int idx = in.lastIndexOf("/");
if (idx != -1)
{
in = in.mid(idx + 1);
if (in.startsWith(OPENTRACK_LIBRARY_PREFIX) &&
in.endsWith("." OPENTRACK_LIBRARY_EXTENSION))
{
constexpr unsigned pfx_len = sizeof(OPENTRACK_LIBRARY_PREFIX) - 1;
constexpr unsigned rst_len = sizeof("." OPENTRACK_LIBRARY_EXTENSION) - 1;
in = in.mid(pfx_len);
in = in.left(in.size() - rst_len);
const char* const names[] =
{
OPENTRACK_LIBRARY_PREFIX "opentrack-tracker-",
OPENTRACK_LIBRARY_PREFIX "opentrack-proto-",
OPENTRACK_LIBRARY_PREFIX "opentrack-filter-",
OPENTRACK_LIBRARY_PREFIX "opentrack-ext-",
};
for (auto name : names)
{
if (in.startsWith(name))
return in.mid(std::strlen(name)).toString();
}
}
}
return {""};
}
bool check(bool fail)
{
if (fail)
{
qDebug() << "library" << module_name << "failed:" << handle.errorString();
Constructor = nullptr;
Dialog = nullptr;
Meta = nullptr;
type = Invalid;
}
return fail;
}
};
struct Modules final
{
using dylib_ptr = std::shared_ptr<dylib>;
using dylib_list = QList<dylib_ptr>;
Modules(const QString& library_path) :
module_list(dylib::enum_libraries(library_path)),
filter_modules(filter(dylib::Filter)),
tracker_modules(filter(dylib::Tracker)),
protocol_modules(filter(dylib::Protocol)),
extension_modules(filter(dylib::Extension))
{}
dylib_list& filters() { return filter_modules; }
dylib_list& trackers() { return tracker_modules; }
dylib_list& protocols() { return protocol_modules; }
dylib_list& extensions() { return extension_modules; }
private:
dylib_list module_list;
dylib_list filter_modules;
dylib_list tracker_modules;
dylib_list protocol_modules;
dylib_list extension_modules;
static dylib_list& sorted(dylib_list& xs)
{
std::sort(xs.begin(), xs.end(), [&](const dylib_ptr& a, const dylib_ptr& b) { return a->name.toLower() < b->name.toLower(); });
return xs;
}
dylib_list filter(dylib::Type t)
{
QList<std::shared_ptr<dylib>> ret;
for (const auto& x : module_list)
if (x->type == t)
ret.push_back(x);
return sorted(ret);
}
};
template<typename t>
std::shared_ptr<t> make_dylib_instance(const std::shared_ptr<dylib>& lib)
{
std::shared_ptr<t> ret;
if (lib != nullptr && lib->Constructor)
ret = std::shared_ptr<t>(reinterpret_cast<t*>(reinterpret_cast<module_ctor_t>(lib->Constructor)()));
return ret;
}
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