get-osx-temperature

get-osx-temperature-pipe.js

// Run command:
// sudo powermetrics --samplers smc | node get-osx-temperature-pipe.js 

process.stdin.resume();
process.stdin.setEncoding('utf8');

let cpuTemperature = 0;
let gpuTemperature = 0;
let fanRpm = 0;

process.stdin.on('data', function (chunk) {
  chunk.split("\n").filter((l) => {
    if (l.startsWith('CPU die temperature:')) {
      cpuTemperature = Number(l.replace(/[^\d.]/g,''));
    }

    if (l.startsWith('GPU die temperature:')) {
      gpuTemperature = Number(l.replace(/[^\d.]/g,''));
    }

    if (l.startsWith('Fan:')) {
      fanRpm = Number(l.replace(/[^\d.]/g,''));
    }
    
  });
  if (cpuTemperature) {
    console.log('');
    console.log(`CPU Temperature: ${cpuTemperature ? cpuTemperature.toFixed(2) : '-'} C`);
    console.log(`GPU Temperature: ${gpuTemperature ? gpuTemperature.toFixed(2) : '-'} C`);
    console.log(`Fan: ${fanRpm ? fanRpm.toFixed(2) : '-'} rpm`);
    console.log('----------------------------------------------------------------------------');
  }
  
});

process.stdin.on('end', function () {
  callback(data)
});

// Expected result:
//
// CPU Temperature: 56.27 C
// GPU Temperature: 51.50 C
// Fan: 2180.00 rpm
// ----------------------------------------------------------------------------

get-osx-temperature-runner.js

// Run command:
// sudo node get-osx-temperature-runner.js 

const { spawn } = require('child_process');
const metrics = spawn('powermetrics', ['--samplers', 'smc']);

let cpuTemperature = 0;
let gpuTemperature = 0;
let fanRpm = 0;

metrics.stdout.on('data', (data) => {
  data.toString().split("\n").filter((l) => {
    if (l.startsWith('CPU die temperature:')) {
      cpuTemperature = Number(l.replace(/[^\d.]/g,''));
    }

    if (l.startsWith('GPU die temperature:')) {
      gpuTemperature = Number(l.replace(/[^\d.]/g,''));
    }

    if (l.startsWith('Fan:')) {
      fanRpm = Number(l.replace(/[^\d.]/g,''));
    }
    
  });
  if (cpuTemperature) {
    console.log('');
    console.log(`CPU Temperature: ${cpuTemperature ? cpuTemperature.toFixed(2) : '-'} C`);
    console.log(`GPU Temperature: ${gpuTemperature ? gpuTemperature.toFixed(2) : '-'} C`);
    console.log(`Fan: ${fanRpm ? fanRpm.toFixed(2) : '-'} rpm`);
    console.log('----------------------------------------------------------------------------');
  }
});

metrics.stderr.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

metrics.on('close', (code) => {
  console.log(`child process exited with code ${code}`);
});

// Expected result:
//
// CPU Temperature: 56.27 C
// GPU Temperature: 51.50 C
// Fan: 2180.00 rpm
// ----------------------------------------------------------------------------