implement cpu temperature

agent/src/cpu.rs

@@ -31,10 +31,14 @@ impl CpuValues {
     }
 }
 
+#[cfg_attr(not(target_os = "linux"), derive(Default))]
 pub struct CpuStatReader {
     previous_stats: HashMap<String, CpuValues>,
 }
 
+const CPU_LINE_PATH: &str = "/proc/stat";
+const CPU_TEMP_PATH: &str = "/sys/class/thermal/thermal_zone0/temp";
+
 impl CpuStatReader {
     pub fn new() -> Self {
         Self {
@@ -42,8 +46,9 @@ impl CpuStatReader {
         }
     }
 
-    pub fn read_global_cpu_stats(&mut self) -> anyhow::Result<CpuBreakdown> {
-        let content = std::fs::read_to_string("/proc/stat").unwrap();
+    #[cfg(target_os = "linux")]
+    pub fn cpu_breakdown(&mut self) -> anyhow::Result<CpuBreakdown> {
+        let content = std::fs::read_to_string(CPU_LINE_PATH)?;
 
         let cpu_line = content
             .lines()
@@ -53,6 +58,16 @@ impl CpuStatReader {
         self.parse_cpu_line(cpu_line)
     }
 
+    #[cfg(target_os = "linux")]
+    pub fn cpu_temperature(&mut self) -> anyhow::Result<f32> {
+        let content = std::fs::read_to_string(CPU_TEMP_PATH)?;
+        let temp_millicelsius = content.trim().parse::<f32>()?;
+
+        let temp_celsius = temp_millicelsius / 1000.0;
+
+        Ok(temp_celsius)
+    }
+
     fn parse_cpu_line(&mut self, line: &str) -> anyhow::Result<CpuBreakdown> {
         let mut parts = line.split_whitespace();