Implement HwmonTemperatureSensor, add serialization

app/CMakeLists.txt

@@ -5,15 +5,17 @@ project(fantasize)
 set(CMAKE_BUILD_TYPE Debug)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+find_package(Boost 1.79.0 COMPONENTS json)
 
 add_executable(app
   src/main.cxx
   src/Nvidia.cxx
   src/Pwm.cxx
   src/SensorsWrapper.cxx
+  src/HwmonTemperatureSensor.cxx
 )
 
 set_property(TARGET app PROPERTY CXX_STANDARD 17)
 
 target_include_directories(app PUBLIC include /opt/cuda)
-target_link_libraries(app PUBLIC sensors nvidia-ml)
+target_link_libraries(app PUBLIC sensors nvidia-ml ${Boost_LIBRARIES})

app/include/HwmonTemperatureSensor.h

@@ -1,11 +1,18 @@
 #ifndef HWMONTEMPERATURESENSOR_H_
 #define HWMONTEMPERATURESENSOR_H_
 
+#include <sensors/sensors.h>
+
 #include <TemperatureSensor.h>
 
 class HwmonTemperatureSensor : public TemperatureSensor {
 public:
   int getTemperature() override;
+  std::string toJson() override;
+
+private:
+  sensors_chip_name mChipName;
+  sensors_subfeature mSubFeature;
 };
 
 #endif // HWMONTEMPERATURESENSOR_H_

app/include/TemperatureSensor.h

@@ -1,9 +1,12 @@
 #ifndef TEMPERATURESENSOR_H_
 #define TEMPERATURESENSOR_H_
 
+#include <iostream>
+
 class TemperatureSensor {
 public:
     virtual int getTemperature() = 0;
+    virtual std::string toJson() = 0;
 };
 
 #endif // TEMPERATURESENSOR_H_

app/src/HwmonTemperatureSensor.cxx

@@ -0,0 +1,33 @@
+#include <boost/json.hpp>
+#include <boost/json/parse.hpp>
+#include <sensors/sensors.h>
+
+#include <HwmonTemperatureSensor.h>
+
+using namespace boost::json;
+
+#define SENSOR_TYPE_STRING "HWMON"
+
+int HwmonTemperatureSensor::getTemperature() {
+  double *value;
+  sensors_get_value(&mChipName, mSubFeature.number, value);
+
+  return static_cast<int>(*value);
+}
+
+void tag_invoke(value_from_tag, value &jv, sensors_bus_id &c) {
+  jv = {{"type", c.type}, {"nr", c.nr}};
+}
+
+void tag_invoke(value_from_tag, value &jv, sensors_chip_name &c) {
+  jv = {{"prefix", c.prefix},
+        {"sensors_bus_id", value_from(c.bus)},
+        {"addr", c.addr},
+        {"path", c.path}};
+}
+
+std::string HwmonTemperatureSensor::toJson() {
+  value jv = {{SENSOR_TYPE_STRING, {"ChipName", value_from(mChipName)}}};
+
+  return serialize(jv);
+}