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

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+const exec = require('child_process').exec;
+const tree = require('./tree');
+const utils = require('./utils');
+var hasPS = true;
+
+// discover if the OS has `ps`, and therefore can use psTree
+exec('ps', error => {
+  module.exports.hasPS = hasPS = !error;
+});
+
+module.exports = function main(pid, callback) {
+  if (typeof pid === 'number') {
+    pid = pid.toString();
+  }
+
+  if (hasPS && !process.env.NO_PS) {
+    return tree(pid, callback);
+  }
+
+  utils
+    .getStat()
+    .then(utils.tree)
+    .then(tree => utils.pidsForTree(tree, pid))
+    .then(res => callback(null, res.map(p => p.PID)))
+    .catch(error => callback(error));
+};
+
+if (!module.parent) {
+  module.exports(process.argv[2], (e, pids) => console.log(pids));
+}
+
+module.exports.hasPS = hasPS;

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

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+const spawn = require('child_process').spawn;
+
+module.exports = function(rootPid, callback) {
+  const tree = {};
+  var output = '';
+
+  // *nix
+  const ps = spawn('ps', ['-A', '-o', 'ppid,pid']);
+  ps.stdout.on('data', data => {
+    output += data.toString('ascii');
+  });
+
+  ps.on('close', () => {
+    try {
+      const res = output
+        .split('\n')
+        .slice(1)
+        .map(_ => _.trim())
+        .reduce((acc, line) => {
+          if (line.indexOf(rootPid + ' ') === 0) {
+            const pid = line.split(/\s+/).pop();
+            acc.push(parseInt(pid, 10));
+            rootPid = pid;
+          }
+
+          return acc;
+        }, []);
+
+      callback(null, res);
+    } catch (e) {
+      callback(e, null);
+    }
+  });
+};

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;
+}