print raw metrics as json

Author: vladkens

readme.md

@@ -65,8 +65,9 @@ sudo cp target/release/macmon /usr/local/bin
 Usage: macmon [OPTIONS] [COMMAND]
 
 Commands:
-  raw   Print raw metrics data instead of TUI
-  help  Print this message or the help of the given subcommand(s)
+  raw    Print metrics in JSON format – can be used for piping
+  debug  Print debug information
+  help   Print this message or the help of the given subcommand(s)
 
 Options:
   -i, --interval <INTERVAL>  Update interval in milliseconds [default: 1000]

src/main.rs

@@ -11,10 +11,10 @@ use std::error::Error;
 
 #[derive(Debug, Subcommand)]
 enum Commands {
-  /// Print raw metrics data instead of TUI
+  /// Print metrics in JSON format – can be used for piping
   Raw,
 
-  /// Print raw metrics data instead of TUI
+  /// Print debug information
   Debug,
 }
 
@@ -40,7 +40,9 @@ fn main() -> Result<(), Box<dyn Error>> {
       let mut sampler = Sampler::new()?;
 
       loop {
-        println!("{:?}", sampler.get_metrics(msec)?);
+        let doc = sampler.get_metrics(msec)?;
+        let doc = serde_json::to_string(&doc)?;
+        println!("{}", doc);
       }
     }
     Some(Commands::Debug) => debug::print_debug()?,

src/metrics.rs

@@ -1,4 +1,5 @@
 use core_foundation::dictionary::CFDictionaryRef;
+use serde::Serialize;
 
 use crate::sources::{
   cfio_get_residencies, cfio_watts, libc_ram, libc_swap, IOHIDSensors, IOReport, SocInfo, SMC,
@@ -12,21 +13,21 @@ const GPU_FREQ_DICE_SUBG: &str = "GPU Performance States";
 
 // MARK: Structs
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Serialize)]
 pub struct TempMetrics {
   pub cpu_temp_avg: f32, // Celsius
   pub gpu_temp_avg: f32, // Celsius
 }
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Serialize)]
 pub struct MemMetrics {
   pub ram_total: u64,  // bytes
   pub ram_usage: u64,  // bytes
   pub swap_total: u64, // bytes
   pub swap_usage: u64, // bytes
 }
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Serialize)]
 pub struct Metrics {
   pub temp: TempMetrics,
   pub memory: MemMetrics,