Add API to retrieve settings
Add API to retrieve and cache settings objects of interest.
Change-Id: I8afd58b5b3e9a691e4d3fa6bfba2ba5c92cd2568
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/settings.hpp b/settings.hpp
new file mode 100644
index 0000000..60ee4d4
--- /dev/null
+++ b/settings.hpp
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <string>
+#include <sdbusplus/bus.hpp>
+
+namespace settings
+{
+
+using Path = std::string;
+using Service = std::string;
+using Interface = std::string;
+
+constexpr auto root = "/";
+
+/** @class Objects
+ * @brief Fetch paths of settings d-bus objects of interest, upon construction
+ */
+struct Objects
+{
+ public:
+ /** @brief Constructor - fetch settings objects
+ *
+ * @param[in] bus - The Dbus bus object
+ * @param[in] filter - A vector of settings interfaces the caller is
+ * interested in.
+ */
+ Objects(sdbusplus::bus::bus& bus, const std::vector<Interface>& filter);
+ Objects(const Objects&) = default;
+ Objects& operator=(const Objects&) = default;
+ Objects(Objects&&) = delete;
+ Objects& operator=(Objects&&) = delete;
+ ~Objects() = default;
+
+ /** @brief Fetch d-bus service, given a path and an interface. The
+ * service can't be cached because mapper returns unique
+ * service names.
+ *
+ * @param[in] path - The Dbus object
+ * @param[in] interface - The Dbus interface
+ *
+ * @return std::string - the dbus service
+ */
+ Service service(const Path& path, const Interface& interface) const;
+
+ // TODO openbmc/openbmc#2058 - This will break when multiple settings,
+ // or in general multiple objects implement a single setting interface.
+ // For instance this will break for a 2-blade server, because we'd have
+ // 2 sets of settings objects. Need to revisit and fix this.
+ /** @brief map of settings objects */
+ std::map<Interface, Path> map;
+
+ /** @brief The Dbus bus object */
+ sdbusplus::bus::bus& bus;
+};
+
+} // namespace settings