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#include <kapi/devices/facet_registry.hpp>
#include <kapi/devices.hpp>
#include <kapi/system.hpp>
#include <kapi/test_support/devices.hpp>
#include <kstd/memory.hpp>
#include <kstd/mutex.hpp>
#include <kstd/result.hpp>
#include <kstd/string.hpp>
#include <kstd/system_error.hpp>
#include <kstd/vector.hpp>
#include <algorithm>
#include <optional>
#include <string_view>
#include <utility>
namespace kapi::devices
{
namespace
{
constinit auto static registry = std::optional<facet_registry>{};
}
auto facet_registry::init() -> void
{
if (registry.has_value())
{
system::panic("[kernel] Device facet registry has already been initialized.");
}
registry.emplace();
}
auto facet_registry::get() -> facet_registry &
{
if (!registry)
{
system::panic("[kernel] Device facet registry has not been initialized.");
}
return *registry;
}
auto facet_registry::do_publish(kstd::shared_ptr<device> device, kstd::string name, kapi::capabilities::facet_id id,
void * facet) -> kstd::result<void>
{
auto published = std::optional<entry>{};
{
auto guard = kstd::lock_guard{m_lock};
erase_if(m_entries, [id](auto e) { return e.id() == id && !e.device(); });
if (!device || !facet || name.empty())
{
return kstd::failure(make_error_code(kstd::errc::invalid_argument));
}
auto already_published = std::ranges::any_of(
m_entries, [&](auto const & entry) { return entry.id() == id && entry.device().get() == device.get(); });
if (already_published)
{
return kstd::failure(make_error_code(kstd::errc::file_exists));
}
published = m_entries.emplace_back(device, std::move(name), id, facet);
}
do_notify_published(id, *published);
return kstd::success();
}
auto facet_registry::do_notify_published(kapi::capabilities::facet_id id, entry const & published) -> void
{
auto observers = kstd::vector<kstd::weak_ptr<facet_registry_observer>>{};
auto static_observers = kstd::vector<facet_registry_observer *>{};
{
auto guard = kstd::lock_guard{m_lock};
observers = m_observers;
static_observers = m_static_observers;
}
std::ranges::for_each(observers, [&](auto observer) {
if (auto locked_observer = observer.lock())
{
locked_observer->on_facet_published(id, published);
}
});
std::ranges::for_each(static_observers, [&](auto observer) { observer->on_facet_published(id, published); });
}
auto facet_registry::do_notify_withdrawn(kapi::capabilities::facet_id id, device const & device) -> void
{
auto observers = kstd::vector<kstd::weak_ptr<facet_registry_observer>>{};
auto static_observers = kstd::vector<facet_registry_observer *>{};
{
auto guard = kstd::lock_guard{m_lock};
observers = m_observers;
static_observers = m_static_observers;
}
std::ranges::for_each(observers, [&](auto observer) {
if (auto locked_observer = observer.lock())
{
locked_observer->on_facet_withdrawn(id, const_cast<devices::device &>(device));
}
});
std::ranges::for_each(static_observers, [&](auto observer) {
observer->on_facet_withdrawn(id, const_cast<devices::device &>(device));
});
}
auto facet_registry::withdraw(device const & device, kapi::capabilities::facet_id id) -> void
{
auto did_remove = false;
{
auto guard = kstd::lock_guard{m_lock};
did_remove = erase_if(m_entries, [&](auto e) {
auto locked_device = e.device();
return e.id() == id && locked_device && locked_device.get() == &device;
}) != 0;
}
if (did_remove)
{
do_notify_withdrawn(id, device);
}
}
auto facet_registry::withdraw_all_for(device const & device) -> void
{
auto withdrawn_facets = kstd::vector<kapi::capabilities::facet_id>{};
{
auto guard = kstd::lock_guard{m_lock};
erase_if(m_entries, [&](auto e) {
auto locked_device = e.device();
auto do_erase = locked_device && locked_device.get() == &device;
if (do_erase)
{
withdrawn_facets.push_back(e.id());
}
return do_erase;
});
}
std::ranges::for_each(withdrawn_facets, [&](auto facet) { do_notify_withdrawn(facet, device); });
}
auto facet_registry::all(kapi::capabilities::facet_id id) const -> kstd::vector<entry>
{
auto guard = kstd::lock_guard{m_lock};
auto filtered = m_entries;
erase_if(filtered, [&](auto e) {
auto locked_device = e.device();
return !(e.id() == id && locked_device);
});
return filtered;
}
auto facet_registry::resolve(kapi::capabilities::facet_id facet, std::string_view name) -> void *
{
auto found_device = kstd::shared_ptr<device>{};
{
auto guard = kstd::lock_guard{m_lock};
auto found = std::ranges::find_if(m_entries, [&](auto e) { return e.name() == name && e.device(); });
if (found == m_entries.cend())
{
return nullptr;
}
found_device = found->device();
}
if (!found_device)
{
return nullptr;
}
return resolve(facet, *found_device);
}
auto facet_registry::resolve(kapi::capabilities::facet_id id, device & device) -> void *
{
if (auto by_device = device.facet(id))
{
return by_device;
}
auto guard = kstd::lock_guard{m_lock};
auto found = std::ranges::find_if(m_entries, [&](auto e) {
auto locked_device = e.device();
return e.id() == id && locked_device && locked_device.get() == &device;
});
if (found == m_entries.cend())
{
return nullptr;
}
return found->untyped_facet();
}
auto facet_registry::subscribe(kstd::weak_ptr<facet_registry_observer> observer) -> void
{
auto guard = kstd::lock_guard{m_lock};
erase_if(m_observers, [](auto const & observer) { return observer.expired(); });
m_observers.push_back(observer);
}
auto facet_registry::subscribe(facet_registry_observer & observer) -> void
{
auto guard = kstd::lock_guard{m_lock};
m_static_observers.push_back(&observer);
}
auto facet_registry::unsubscribe(facet_registry_observer & observer) -> void
{
auto guard = kstd::lock_guard{m_lock};
erase_if(m_observers, [&](auto const & subscribed) { return subscribed.lock().get() == &observer; });
erase(m_static_observers, &observer);
}
} // namespace kapi::devices
namespace kapi::test_support::devices
{
auto deinit_facet_registry() -> void
{
kapi::devices::registry.reset();
}
} // namespace kapi::test_support::devices
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