watchdog: Rewrite using sdbusplus

Change-Id: I730317954819859d23fdaca7336f19f5c5b0c107
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/app/watchdog_service.hpp b/app/watchdog_service.hpp
new file mode 100644
index 0000000..4590e31
--- /dev/null
+++ b/app/watchdog_service.hpp
@@ -0,0 +1,61 @@
+#pragma once
+#include <sdbusplus/bus.hpp>
+
+/** @class WatchdogService
+ *  @brief Access to the running OpenBMC watchdog implementation.
+ *  @details Easy accessor for servers that implement the
+ *  xyz.openbmc_project.State.Watchdog DBus API.
+ */
+class WatchdogService {
+    public:
+        WatchdogService();
+
+        /** @brief Contains a copy of the properties enumerated by the
+         *         watchdog service.
+         */
+        struct Properties {
+            bool enabled;
+            uint64_t interval;
+            uint64_t timeRemaining;
+        };
+
+        /** @brief Retrieves a copy of the currently set properties on the
+         *         host watchdog
+         *
+         *  @return A populated WatchdogProperties struct
+         */
+        Properties getProperties();
+
+        /** @brief Sets the value of the enabled property on the host watchdog
+         *
+         *  @param[in] enabled - The new enabled value
+         */
+        void setEnabled(bool enabled);
+
+        /** @brief Sets the value of the interval property on the host watchdog
+         *
+         *  @param[in] interval - The new interval value
+         */
+        void setInterval(uint64_t interval);
+
+        /** @brief Sets the value of the timeRemaining property on the host
+         *         watchdog
+         *
+         *  @param[in] timeRemaining - The new timeRemaining value
+         */
+        void setTimeRemaining(uint64_t timeRemaining);
+
+    private:
+        /** @brief sdbusplus handle */
+        sdbusplus::bus::bus bus;
+        /** @brief The name of the mapped host watchdog service */
+        const std::string wd_service;
+
+        /** @brief Sets the value of the property on the host watchdog
+         *
+         *  @param[in] key - The name of the property
+         *  @param[in] val - The new value
+         */
+        template <typename T>
+        void setProperty(const std::string& key, const T& val);
+};