feat(node/os): implement getPriority, setPriority & userInfo (#19370)

Takes #4202 over
Closes #17850 

---------

Co-authored-by: ecyrbe <ecyrbe@gmail.com>

2 files changed, 53 insertions, 9 deletions

diff --git a/ext/node/polyfills/internal/errors.ts b/ext/node/polyfills/internal/errors.ts
index 55098d79b..2ba7ec28e 100644
--- a/ext/node/polyfills/internal/errors.ts
+++ b/ext/node/polyfills/internal/errors.ts
@@ -2497,6 +2497,19 @@ export class ERR_FS_RMDIR_ENOTDIR extends NodeSystemError {
   }
 }
 
+export class ERR_OS_NO_HOMEDIR extends NodeSystemError {
+  constructor() {
+    const code = isWindows ? "ENOENT" : "ENOTDIR";
+    const ctx: NodeSystemErrorCtx = {
+      message: "not a directory",
+      syscall: "home",
+      code,
+      errno: isWindows ? osConstants.errno.ENOENT : osConstants.errno.ENOTDIR,
+    };
+    super(code, ctx, "Path is not a directory");
+  }
+}
+
 interface UvExceptionContext {
   syscall: string;
   path?: string;
diff --git a/ext/node/polyfills/os.ts b/ext/node/polyfills/os.ts
index acdc1c977..a874c942c 100644
--- a/ext/node/polyfills/os.ts
+++ b/ext/node/polyfills/os.ts
@@ -23,15 +23,16 @@
 // TODO(petamoriken): enable prefer-primordials for node polyfills
 // deno-lint-ignore-file prefer-primordials
 
-import { notImplemented } from "ext:deno_node/_utils.ts";
+const core = globalThis.__bootstrap.core;
 import { validateIntegerRange } from "ext:deno_node/_utils.ts";
 import process from "node:process";
 import { isWindows, osType } from "ext:deno_node/_util/os.ts";
+import { ERR_OS_NO_HOMEDIR } from "ext:deno_node/internal/errors.ts";
 import { os } from "ext:deno_node/internal_binding/constants.ts";
 import { osUptime } from "ext:runtime/30_os.js";
-export const constants = os;
+import { Buffer } from "ext:deno_node/internal/buffer.mjs";
 
-const SEE_GITHUB_ISSUE = "See https://github.com/denoland/deno_std/issues/1436";
+export const constants = os;
 
 interface CPUTimes {
   /** The number of milliseconds the CPU has spent in user mode */
@@ -93,8 +94,8 @@ interface UserInfo {
   username: string;
   uid: number;
   gid: number;
-  shell: string;
-  homedir: string;
+  shell: string | null;
+  homedir: string | null;
 }
 
 export function arch(): string {
@@ -161,7 +162,7 @@ export function freemem(): number {
 /** Not yet implemented */
 export function getPriority(pid = 0): number {
   validateIntegerRange(pid, "pid");
-  notImplemented(SEE_GITHUB_ISSUE);
+  return core.ops.op_node_os_get_priority(pid);
 }
 
 /** Returns the string path of the current user's home directory. */
@@ -257,7 +258,7 @@ export function setPriority(pid: number, priority?: number) {
   validateIntegerRange(pid, "pid");
   validateIntegerRange(priority, "priority", -20, 19);
 
-  notImplemented(SEE_GITHUB_ISSUE);
+  core.ops.op_node_os_set_priority(pid, priority);
 }
 
 /** Returns the operating system's default directory for temporary files as a string. */
@@ -317,10 +318,40 @@ export function uptime(): number {
 
 /** Not yet implemented */
 export function userInfo(
-  // deno-lint-ignore no-unused-vars
   options: UserInfoOptions = { encoding: "utf-8" },
 ): UserInfo {
-  notImplemented(SEE_GITHUB_ISSUE);
+  const uid = Deno.uid();
+  const gid = Deno.gid();
+
+  if (isWindows) {
+    uid = -1;
+    gid = -1;
+  }
+
+  // TODO(@crowlKats): figure out how to do this correctly:
+  //  The value of homedir returned by os.userInfo() is provided by the operating system.
+  //  This differs from the result of os.homedir(), which queries environment
+  //  variables for the home directory before falling back to the operating system response.
+  let _homedir = homedir();
+  if (!_homedir) {
+    throw new ERR_OS_NO_HOMEDIR();
+  }
+  let shell = isWindows ? (Deno.env.get("SHELL") || null) : null;
+  let username = core.ops.op_node_os_username();
+
+  if (options?.encoding === "buffer") {
+    _homedir = _homedir ? Buffer.from(_homedir) : _homedir;
+    shell = shell ? Buffer.from(shell) : shell;
+    username = Buffer.from(username);
+  }
+
+  return {
+    uid,
+    gid,
+    homedir: _homedir,
+    shell,
+    username,
+  };
 }
 
 export const EOL = isWindows ? "\r\n" : "\n";