Create CPU-usage script

relay/cpu_usage.py

@@ -0,0 +1,43 @@
+import time
+
+def measure_proc_stat() -> dict[str, int]:
+  proc_stat_header = open("/proc/stat", "r").readline()
+  proc_stat = proc_stat_header.split(' ')[2:]
+  proc_stat[-1] = proc_stat[-1].removesuffix('\n')
+  proc_stat = list(map(int, proc_stat))
+
+  proc_stat_dict= {'user': proc_stat[0],
+                   'nice': proc_stat[1],
+                   'system': proc_stat[2],
+                   'idle': proc_stat[3],
+                   'iowait': proc_stat[4],
+                   'irq': proc_stat[5],
+                   'softirq': proc_stat[6],
+                   'steal': proc_stat[7],
+                   'guest': proc_stat[8],
+                   'guest_nice': proc_stat[9]}
+
+  return proc_stat_dict
+
+if __name__ == "__main__":
+  """
+  Script emulates htop calculation of CPU at the
+  moment of calling.
+  """
+  prev = measure_proc_stat()
+  prev_idle = prev.get('idle') + prev.get('iowait')
+  prev_non_idle = prev.get('user') + prev.get('nice') + prev.get('system') + prev.get('irq') + prev.get('softirq') + prev.get('steal')
+  prev_total = prev_idle + prev_non_idle
+
+  time.sleep(0.1)
+
+  curr = measure_proc_stat()
+  curr_idle = curr.get('idle') + curr.get('iowait')
+  curr_non_idle = curr.get('user') + curr.get('nice') + curr.get('system') + curr.get('irq') + curr.get('softirq') + curr.get('steal')
+  curr_total = curr_idle + curr_non_idle
+
+  d_total = curr_total - prev_total
+  d_idle = curr_idle - prev_idle
+
+  cpu_usage = ((d_total - d_idle)/d_total) * 100
+  print(round(cpu_usage, 20))

relay/index.mjs

@@ -71,15 +71,7 @@ const server = app
     express.static(path.join(getGameDir(owner,repo),".lake","gamedata"))(req, res, next);
   })
   .use('/data/stats', (req, res, next) => {
-    // Returns a CSV of the form
-    //
-    // CPU,Mem
-    // 0.21,0.65
-    //
-    // which contains the current server usage.
-
     const statsProcess = spawn('/bin/bash', [path.join(__dirname, "stats.sh"), process.pid])
-
     let outputData = ''
     let errorData = ''
     statsProcess.stdout.on('data', (data) => {