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 
34         msg.read(resp);
35         if (msg.is_method_error())
36         {
37             log<level::ERR>("Error in mapper call");
38             elog<InternalFailure>();
39         }
40     }
41     catch (const sdbusplus::exception::SdBusError& ex)
42     {
43         if (ex.name() == std::string(sdbusplus::xyz::openbmc_project::Common::
44                                          Error::ResourceNotFound::errName))
45         {
46             // The service isn't on D-Bus yet.
47             return std::string{};
48         }
49 
50         throw;
51     }
52 
53     if (resp.begin() == resp.end())
54     {
55         // Shouldn't happen, if the mapper can't find it it is handled above.
56         throw std::runtime_error("Unable to find Object: " + path);
57     }
58 
59     return resp.begin()->first;
60 }
61 
62 template <typename T>
63 
64 T getDbusProperty(sdbusplus::bus::bus& bus, const std::string& service,
65                   const std::string& path, const std::string& intf,
66                   const std::string& property)
67 {
68 
69     Value value;
70 
71     auto method =
72         bus.new_method_call(service.c_str(), path.c_str(), propIntf, methodGet);
73 
74     method.append(intf, property);
75 
76     auto msg = bus.call(method);
77 
78     if (msg.is_method_error())
79     {
80         log<level::ERR>("Failed to get property",
81                         entry("PROPERTY=%s", property.c_str()),
82                         entry("PATH=%s", path.c_str()),
83                         entry("INTERFACE=%s", intf.c_str()));
84         elog<InternalFailure>();
85     }
86 
87     msg.read(value);
88 
89     return std::get<T>(value);
90 }
91