1 files changed, 131 insertions, 0 deletions
diff --git a/sdevent/event.hpp b/sdevent/event.hpp
new file mode 100644
index 0000000..ac9a13d
--- /dev/null
+++ b/sdevent/event.hpp
@@ -0,0 +1,131 @@
+#pragma once
+
+#include <chrono>
+#include <memory>
+#include <sdbusplus/bus.hpp>
+#include <systemd/sd-event.h>
+
+// TODO: openbmc/openbmc#1720 - add error handling for sd_event API failures
+
+namespace sdevent
+{
+namespace event
+{
+
+using EventPtr = sd_event*;
+class Event;
+
+/** @brief Get an instance of the 'default' event. */
+Event newDefault();
+
+namespace details
+{
+
+/** @brief unique_ptr functor to release an event reference. */
+struct EventDeleter
+{
+    void operator()(sd_event* ptr) const
+    {
+        deleter(ptr);
+    }
+
+    decltype(&sd_event_unref) deleter = sd_event_unref;
+};
+
+/* @brief Alias 'event' to a unique_ptr type for auto-release. */
+using Event = std::unique_ptr<sd_event, EventDeleter>;
+
+} // namespace details
+
+/** @class Event
+ *  @brief Provides C++ bindings to the sd_event_* class functions.
+ */
+class Event
+{
+    public:
+        /* Define all of the basic class operations:
+         *     Not allowed:
+         *         - Default constructor to avoid nullptrs.
+         *         - Copy operations due to internal unique_ptr.
+         *     Allowed:
+         *         - Move operations.
+         *         - Destructor.
+         */
+        Event() = delete;
+        Event(const Event&) = delete;
+        Event& operator=(const Event&) = delete;
+        Event(Event&&) = default;
+        Event& operator=(Event&&) = default;
+        ~Event() = default;
+
+        /** @brief Conversion constructor from 'EventPtr'.
+         *
+         *  Increments ref-count of the event-pointer and releases it when
+         *  done.
+         */
+        explicit Event(EventPtr e);
+
+        /** @brief Constructor for 'Event'.
+         *
+         *  Takes ownership of the event-pointer and releases it when done.
+         */
+        Event(EventPtr e, std::false_type);
+
+        /** @brief Release ownership of the stored event-pointer. */
+        EventPtr release()
+        {
+            return evt.release();
+        }
+
+        /** @brief Wait indefinitely for new event sources. */
+        void loop()
+        {
+            sd_event_loop(evt.get());
+        }
+
+        /** @brief Attach to a DBus loop. */
+        void attach(sdbusplus::bus::bus& bus)
+        {
+            bus.attach_event(evt.get(), SD_EVENT_PRIORITY_NORMAL);
+        }
+
+        /** @brief C++ wrapper for sd_event_now. */
+        auto now()
+        {
+            using namespace std::chrono;
+
+            uint64_t usec;
+            sd_event_now(evt.get(), CLOCK_MONOTONIC, &usec);
+            microseconds d(usec);
+            return steady_clock::time_point(d);
+        }
+
+    private:
+
+        EventPtr get()
+        {
+            return evt.get();
+        }
+
+        details::Event evt;
+};
+
+inline Event::Event(EventPtr l) : evt(sd_event_ref(l))
+{
+
+}
+
+inline Event::Event(EventPtr l, std::false_type) : evt(l)
+{
+
+}
+
+inline Event newDefault()
+{
+    sd_event* e = nullptr;
+    sd_event_default(&e);
+    return Event(e, std::false_type());
+}
+
+} // namespace event
+} // namespace sdevent