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express-server/node_modules/pstree.remy/lib/utils.js

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+const spawn = require('child_process').spawn;
+
+module.exports = { tree, pidsForTree, getStat };
+
+function getStat() {
+  return new Promise(resolve => {
+    const command = `ls /proc | grep -E '^[0-9]+$' | xargs -I{} cat /proc/{}/stat`;
+    const child = spawn('sh', ['-c', command], {
+      stdio: ['pipe', 'pipe', 'pipe'],
+    });
+
+    var res = '';
+    child.stdout.on('data', data => (res += data));
+    child.on('close', () => resolve(res));
+  });
+}
+
+function template(s) {
+  var stat = null;
+  // 'pid', 'comm', 'state', 'ppid', 'pgrp'
+  // %d     (%s)    %c       %d      %d
+  s.replace(
+    /(\d+) \((.*?)\)\s(.+?)\s(\d+)\s/g,
+    (all, PID, COMMAND, STAT, PPID) => {
+      stat = { PID, COMMAND, PPID, STAT };
+    }
+  );
+
+  return stat;
+}
+
+function tree(stats) {
+  const processes = stats
+    .split('\n')
+    .map(template)
+    .filter(Boolean);
+
+  return processes;
+}
+
+function pidsForTree(tree, pid) {
+  if (typeof pid === 'number') {
+    pid = pid.toString();
+  }
+  const parents = [pid];
+  const children = [];
+
+  tree.forEach(proc => {
+    if (parents.indexOf(proc.PPID) !== -1) {
+      parents.push(proc.PID);
+      children.push(proc);
+    }
+  });
+
+  return children;
+}