Experimental CPU Optimize Techniques

server/utils/fd-cache.js

@@ -0,0 +1,34 @@
+import fs from 'fs'
+
+const READ_BUF = Buffer.alloc(65536)
+const fdCache = new Map()
+
+export function readFileCached(path) {
+  let entry = fdCache.get(path)
+  if (entry === undefined) {
+    try {
+      const fd = fs.openSync(path, 'r')
+      entry = { fd }
+      fdCache.set(path, entry)
+    } catch {
+      fdCache.set(path, null)
+      return null
+    }
+  }
+  if (!entry) return null
+  try {
+    const bytesRead = fs.readSync(entry.fd, READ_BUF, 0, READ_BUF.length, 0)
+    return READ_BUF.toString('utf8', 0, bytesRead)
+  } catch {
+    return null
+  }
+}
+
+export function closeFdCache() {
+  for (const [path, entry] of fdCache) {
+    if (entry) {
+      try { fs.closeSync(entry.fd) } catch {}
+    }
+  }
+  fdCache.clear()
+}