1 #include <phosphor-logging/elog-errors.hpp>
2 #include <phosphor-logging/log.hpp>
3 #include <xyz/openbmc_project/Common/error.hpp>
4 
5 const char* propIntf = "org.freedesktop.DBus.Properties";
6 const char* mapperBusName = "xyz.openbmc_project.ObjectMapper";
7 const char* mapperPath = "/xyz/openbmc_project/object_mapper";
8 const char* mapperIntf = "xyz.openbmc_project.ObjectMapper";
9 
10 const char* methodGetObject = "GetObject";
11 const char* methodGet = "Get";
12 
13 using namespace phosphor::logging;
14 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
15 
16 using Value = std::variant<int64_t, double, std::string, bool>;
17 
18 std::string getService(sdbusplus::bus::bus& bus, const std::string& path,
19                        const char* intf)
20 {
21     /* Get mapper object for sensor path */
22     auto mapper = bus.new_method_call(mapperBusName, mapperPath, mapperIntf,
23                                       methodGetObject);
24 
25     mapper.append(path.c_str());
26     mapper.append(std::vector<std::string>({intf}));
27 
28     std::unordered_map<std::string, std::vector<std::string>> resp;
29 
30     try
31     {
32         auto msg = bus.call(mapper);
33         msg.read(resp);
34     }
35     catch (const sdbusplus::exception::SdBusError& ex)
36     {
37         if (ex.name() == std::string(sdbusplus::xyz::openbmc_project::Common::
38                                          Error::ResourceNotFound::errName))
39         {
40             // The service isn't on D-Bus yet.
41             return std::string{};
42         }
43 
44         throw;
45     }
46 
47     if (resp.begin() == resp.end())
48     {
49         // Shouldn't happen, if the mapper can't find it it is handled above.
50         throw std::runtime_error("Unable to find Object: " + path);
51     }
52 
53     return resp.begin()->first;
54 }
55 
56 template <typename T>
57 
58 T getDbusProperty(sdbusplus::bus::bus& bus, const std::string& service,
59                   const std::string& path, const std::string& intf,
60                   const std::string& property)
61 {
62 
63     Value value;
64 
65     auto method =
66         bus.new_method_call(service.c_str(), path.c_str(), propIntf, methodGet);
67 
68     method.append(intf, property);
69 
70     try
71     {
72         auto msg = bus.call(method);
73         msg.read(value);
74     }
75     catch (const sdbusplus::exception::SdBusError& ex)
76     {
77         return std::numeric_limits<T>::quiet_NaN();
78     }
79 
80     return std::get<T>(value);
81 }
82