Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 1 | #include <util/dbus.hpp> |
| 2 | #include <util/trace.hpp> |
| 3 | |
| 4 | namespace util |
| 5 | { |
| 6 | |
| 7 | namespace dbus |
| 8 | { |
| 9 | |
| 10 | //------------------------------------------------------------------------------ |
| 11 | |
| 12 | constexpr auto objectMapperService = "xyz.openbmc_project.ObjectMapper"; |
| 13 | constexpr auto objectMapperPath = "/xyz/openbmc_project/object_mapper"; |
| 14 | constexpr auto objectMapperInterface = "xyz.openbmc_project.ObjectMapper"; |
| 15 | |
| 16 | /** @brief Find the path and service that implements the given interface */ |
| 17 | int find(const std::string& i_interface, std::string& o_path, |
| 18 | std::string& o_service) |
| 19 | { |
| 20 | int rc = 1; // assume not success |
| 21 | |
| 22 | auto bus = sdbusplus::bus::new_default(); |
| 23 | |
Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 24 | try |
| 25 | { |
Ben Tyner | 659e65c | 2021-07-21 09:49:35 -0500 | [diff] [blame^] | 26 | constexpr auto function = "GetSubTree"; |
| 27 | |
Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 28 | auto method = bus.new_method_call(objectMapperService, objectMapperPath, |
| 29 | objectMapperInterface, function); |
| 30 | |
| 31 | // Search the entire dbus tree for the specified interface |
| 32 | method.append(std::string{"/"}, 0, |
| 33 | std::vector<std::string>{i_interface}); |
| 34 | |
| 35 | auto reply = bus.call(method); |
| 36 | |
| 37 | DBusSubTree response; |
| 38 | reply.read(response); |
| 39 | |
| 40 | if (!response.empty()) |
| 41 | { |
| 42 | // Response is a map of object paths to a map of service, interfaces |
| 43 | auto object = *(response.begin()); |
| 44 | o_path = object.first; // return path |
| 45 | o_service = object.second.begin()->first; // return service |
| 46 | |
| 47 | rc = 0; // success |
| 48 | } |
| 49 | } |
| 50 | catch (const sdbusplus::exception::SdBusError& e) |
| 51 | { |
| 52 | trace::err("util::dbus::find exception"); |
| 53 | std::string traceMsg = std::string(e.what()); |
| 54 | trace::err(traceMsg.c_str()); |
| 55 | } |
| 56 | |
| 57 | return rc; |
| 58 | } |
| 59 | |
| 60 | /** @brief Find the service that implements the given object and interface */ |
| 61 | int findService(const std::string& i_interface, const std::string& i_path, |
| 62 | std::string& o_service) |
| 63 | { |
| 64 | int rc = 1; // assume not success |
| 65 | |
| 66 | auto bus = sdbusplus::bus::new_default(); |
| 67 | |
Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 68 | try |
| 69 | { |
Ben Tyner | 659e65c | 2021-07-21 09:49:35 -0500 | [diff] [blame^] | 70 | constexpr auto function = "GetObject"; |
| 71 | |
Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 72 | auto method = bus.new_method_call(objectMapperService, objectMapperPath, |
| 73 | objectMapperInterface, function); |
| 74 | |
| 75 | // Find services that implement the object path, constrain the search |
| 76 | // to the given interface. |
| 77 | method.append(i_path, std::vector<std::string>{i_interface}); |
| 78 | |
| 79 | auto reply = bus.call(method); |
| 80 | |
| 81 | // response is a map of service names to their interfaces |
| 82 | std::map<DBusService, DBusInterfaceList> response; |
| 83 | reply.read(response); |
| 84 | |
| 85 | if (!response.empty()) |
| 86 | { |
| 87 | // return the service |
| 88 | o_service = response.begin()->first; |
| 89 | |
| 90 | rc = 0; // success |
| 91 | } |
| 92 | } |
| 93 | catch (const sdbusplus::exception::SdBusError& e) |
| 94 | { |
| 95 | trace::err("util::dbus::map exception"); |
| 96 | std::string traceMsg = std::string(e.what()); |
| 97 | trace::err(traceMsg.c_str()); |
| 98 | } |
| 99 | |
| 100 | return rc; |
| 101 | } |
| 102 | |
| 103 | /** @brief Read a property from a dbus object interface */ |
| 104 | int getProperty(const std::string& i_interface, const std::string& i_path, |
| 105 | const std::string& i_service, const std::string& i_property, |
| 106 | DBusValue& o_response) |
| 107 | { |
| 108 | int rc = 1; // assume not success |
| 109 | |
| 110 | auto bus = sdbusplus::bus::new_default(); |
| 111 | |
Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 112 | try |
| 113 | { |
Ben Tyner | 659e65c | 2021-07-21 09:49:35 -0500 | [diff] [blame^] | 114 | constexpr auto interface = "org.freedesktop.DBus.Properties"; |
| 115 | constexpr auto function = "Get"; |
| 116 | |
Ben Tyner | 324234b | 2021-06-28 17:01:17 -0500 | [diff] [blame] | 117 | // calling the get property method |
| 118 | auto method = bus.new_method_call(i_service.c_str(), i_path.c_str(), |
| 119 | interface, function); |
| 120 | |
| 121 | method.append(i_interface, i_property); |
| 122 | auto reply = bus.call(method); |
| 123 | |
| 124 | // returning the property value |
| 125 | reply.read(o_response); |
| 126 | |
| 127 | rc = 0; // success |
| 128 | } |
| 129 | catch (const sdbusplus::exception::SdBusError& e) |
| 130 | { |
| 131 | trace::err("util::dbus::getProperty exception"); |
| 132 | std::string traceMsg = std::string(e.what()); |
| 133 | trace::err(traceMsg.c_str()); |
| 134 | } |
| 135 | |
| 136 | return rc; |
| 137 | } |
| 138 | |
| 139 | /** @brief Get the IBM compatible names defined for this system */ |
| 140 | std::vector<std::string> systemNames() |
| 141 | { |
| 142 | std::vector<std::string> names; |
| 143 | |
| 144 | constexpr auto interface = |
| 145 | "xyz.openbmc_project.Configuration.IBMCompatibleSystem"; |
| 146 | |
| 147 | DBusService service; |
| 148 | DBusPath path; |
| 149 | |
| 150 | // find a dbus object and path that implements the interface |
| 151 | if (0 == find(interface, path, service)) |
| 152 | { |
| 153 | DBusValue value; |
| 154 | |
| 155 | // compatible system names are implemented as a property |
| 156 | constexpr auto property = "Names"; |
| 157 | |
| 158 | if (0 == getProperty(interface, path, service, property, value)) |
| 159 | { |
| 160 | // return value is a variant, names are in the vector |
| 161 | names = std::get<std::vector<std::string>>(value); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | return names; |
| 166 | } |
| 167 | |
| 168 | } // namespace dbus |
| 169 | |
| 170 | } // namespace util |