fix: clean up handles in worker_threads environments to prevent aborting

When using in `worker_threads` Workers, Node.js will abort with messages like:

```
uv loop at [0x00000000] has open handles...
```

when workers are exiting or are terminated with active `DgramSocket` or `SeqpacketSocket`.

To fix this issue, we need clean up all active uv_handles in hooks registered by `napi_add_env_cleanup_hook`.

Author: oyyd

.github/workflows/CI.yml

@@ -2,30 +2,30 @@ name: CI
 env:
   DEBUG: napi:*
   APP_NAME: node-unix-socket
-  MACOSX_DEPLOYMENT_TARGET: '10.13'
-'on':
+  MACOSX_DEPLOYMENT_TARGET: "10.13"
+"on":
   push:
     branches:
       - master
     tags-ignore:
-      - '**'
+      - "**"
     paths-ignore:
-      - '**/*.md'
+      - "**/*.md"
       - LICENSE
-      - '**/*.gitignore'
+      - "**/*.gitignore"
       - .editorconfig
       - docs/**
   pull_request: null
   workflow_dispatch:
     inputs:
       publish:
-        description: 'Publish the npm package.'
+        description: "Publish the npm package."
         required: true
         type: boolean
         default: false
 jobs:
   build:
-    if: '!contains(github.event.head_commit.message, ''skip ci'')'
+    if: "!contains(github.event.head_commit.message, 'skip ci')"
     strategy:
       fail-fast: false
       matrix:
@@ -54,7 +54,7 @@ jobs:
               yarn build --target x86_64-unknown-linux-gnu &&
               strip *.node
           - host: ubuntu-latest
-            target: 'x86_64-unknown-linux-musl'
+            target: "x86_64-unknown-linux-musl"
             docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-alpine
             build: yarn build
           - host: ubuntu-latest
@@ -140,14 +140,14 @@ jobs:
         if: ${{ matrix.settings.docker }}
         with:
           image: ${{ matrix.settings.docker }}
-          options: '-v ${{ env.HOME }}/.cargo/git:/root/.cargo/git -v ${{ env.HOME }}/.cargo/registry:/root/.cargo/registry -v ${{ github.workspace }}:/build -w /build'
+          options: "-v ${{ env.HOME }}/.cargo/git:/root/.cargo/git -v ${{ env.HOME }}/.cargo/registry:/root/.cargo/registry -v ${{ github.workspace }}:/build -w /build"
           run: ${{ matrix.settings.build }}
       - name: Build
         run: ${{ matrix.settings.build }}
         if: ${{ !matrix.settings.docker }}
         shell: bash
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: bindings-${{ matrix.settings.target }}
           path: ${{ env.APP_NAME }}.*.node
@@ -160,10 +160,9 @@ jobs:
       fail-fast: false
       matrix:
         node:
-          - '12'
-          - '14'
-          - '16'
-          - '18'
+          - "18"
+          - "20"
+          - "22"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -201,10 +200,9 @@ jobs:
           - host: macos-latest
             target: x86_64-apple-darwin
         node:
-          - '12'
-          - '14'
-          - '16'
-          - '18'
+          - "18"
+          - "20"
+          - "22"
     runs-on: ${{ matrix.settings.host }}
     steps:
       - uses: actions/checkout@v3

.npmignore

@@ -10,7 +10,7 @@ yarn.lock
 *.node
 
 check.py
-resouce
+resource
 scripts
 .devcontainer
 __test__

CHANGELOG.md

@@ -1,5 +1,8 @@
 # CHANGELOG
 
+## 0.2.6
+fix: clean up handles in worker_threads environments to prevent aborting
+
 ## 0.2.5
 fix: close the socket if connecting failed
 

__test__/create_socket.js

@@ -0,0 +1,12 @@
+const { DgramSocket } = require('../js')
+const fs = require('fs')
+const path = require('path')
+
+const serverPath = path.resolve(__dirname, './.tmp/worker_server.sock')
+try {
+  fs.unlinkSync(serverPath)
+} catch (err) {
+  //
+}
+const socket = new DgramSocket(serverPath);
+socket.bind(serverPath)

__test__/dgram.spec.ts

@@ -1,14 +1,14 @@
-// TODO add tests for worker_threads
 import * as path from 'path';
 import * as fs from 'fs';
 import * as os from 'os';
+import * as workerThreads from 'worker_threads'
 import { DgramSocket } from '../js/index';
-import { kTmp, silently, createDefer, kServerPath } from './util';
+import { kTmp, silently, createDefer, kServerPath, wait } from './util';
 
 const kClientPath = path.resolve(kTmp, './client.sock');
 const kInvalidPath = path.resolve(kTmp, './A_PATH_THAT_DOESNT_EXIST');
 
-const emptyFn = () => {};
+const emptyFn = () => { };
 
 describe('DgramSocket', () => {
   beforeAll(() => {
@@ -308,4 +308,10 @@ describe('DgramSocket', () => {
     client.close()
     await p
   });
+
+  it('should not abort in worker_threads', async () => {
+    const worker = new workerThreads.Worker(path.resolve(__dirname, './create_socket.js'))
+    await wait(1000)
+    worker.terminate()
+  });
 });

__test__/socket.spec.ts

@@ -1,5 +1,5 @@
 import * as net from 'net'
-import { createReuseportFd as createFd, closeFd  } from '../js/index'
+import { createReuseportFd as createFd, closeFd } from '../js/index'
 import { hasIPv6 } from './util'
 
 describe('tcp', () => {
@@ -8,11 +8,13 @@ describe('tcp', () => {
       const host = '0.0.0.0'
       let port = 0;
 
-      async function createServer() {
+      async function createServer(): Promise<net.Server> {
         const fd = createFd(port, host);
 
         const server = await new Promise<net.Server>((resolve, reject) => {
-          const server = net.createServer()
+          const server = net.createServer({
+            noDelay: true,
+          })
 
           server.listen({
             fd,
@@ -26,14 +28,14 @@ describe('tcp', () => {
         return server
       }
 
-      const servers = [];
+      const servers: net.Server[] = [];
       for (let i = 0; i < 5; i += 1) {
         const server = await createServer()
         servers.push(server);
       }
 
       const pList = servers.map(server => {
-        return new Promise((resolve, reject) => {
+        return new Promise<Buffer>((resolve, reject) => {
           server.once('connection', (socket) => {
             socket.on('data', buf => {
               resolve(buf)
@@ -55,15 +57,17 @@ describe('tcp', () => {
       servers.forEach(server => server.close());
     })
 
-    if (hasIPv6())  {
+    if (hasIPv6()) {
       it('should work with ipv6', async () => {
         const host = '::1'
         let port = 0;
 
         const fd = createFd(port, host);
 
         const server = await new Promise<net.Server>((resolve, reject) => {
-          const server = net.createServer()
+          const server = net.createServer({
+            noDelay: true,
+          })
 
           server.listen({
             fd,
@@ -72,7 +76,7 @@ describe('tcp', () => {
           })
         })
         port = (server.address() as any).port
-        const p = new Promise((resolve, reject) => {
+        const p = new Promise<Buffer>((resolve, reject) => {
           server.once('connection', (socket) => {
             socket.on('data', buf => {
               resolve(buf)

js/addon.d.ts

@@ -5,6 +5,7 @@
 
 export function socketNewSoReuseportFd(domain: string, port: number, ip: string): number
 export function socketClose(fd: number): void
+export function initCleanupHook(): void
 export class SeqpacketSocketWrap {
   constructor(ee: object, fd?: number | undefined | null)
   init(thisObj: object): void

js/index.ts

@@ -1,3 +1,11 @@
+import * as workerThreads from 'worker_threads'
+import { initCleanupHook } from './addon'
+
 export { SendCb, DgramSocket } from './dgram'
 export { NotifyCb, SeqpacketSocket, SeqpacketServer } from './seqpacket'
 export { createReuseportFd, closeFd } from './socket'
+
+// Node.js will abort when threads are termiated if we don't clean up uv handles.
+if (!workerThreads.isMainThread) {
+  initCleanupHook()
+}

js/seqpacket.ts

@@ -291,6 +291,13 @@ export class SeqpacketSocket extends EventEmitter {
     this.wrap.close();
   }
 
+  /**
+   * Alias of "destory".
+   */
+  close() {
+    return this.destroy();
+  }
+
   /**
    * For test only
    * @ignore

package.json

@@ -1,6 +1,6 @@
 {
   "name": "node-unix-socket",
-  "version": "0.2.5",
+  "version": "0.2.6",
   "main": "js/index.js",
   "types": "js/index.d.ts",
   "author": {
@@ -39,7 +39,7 @@
   "devDependencies": {
     "@napi-rs/cli": "^2.10.3",
     "@types/jest": "^27.5.0",
-    "@types/node": "^17.0.31",
+    "@types/node": "^22.7.6",
     "jest": "^27.5.1",
     "ts-jest": "^27.1.4",
     "typedoc": "^0.22.15",

src/dgram.rs

@@ -13,6 +13,7 @@ use crate::util::{
   addr_to_string, buf_into_vec, check_emit, error, get_err, i8_slice_into_u8_slice,
   resolve_libc_err, resolve_uv_err, set_clo_exec, set_non_block, socket_addr_to_string,
 };
+use crate::uv_handle::{insert_handle, remove_handle};
 
 #[allow(dead_code)]
 fn string_from_i8_slice(slice: &[i8]) -> Result<String> {
@@ -65,6 +66,7 @@ impl DgramSocketWrap {
       handle.data = std::ptr::null_mut() as *mut _;
       handle
     }));
+    insert_handle(unsafe { mem::transmute(handle) })?;
 
     Ok(Self {
       fd,
@@ -297,6 +299,7 @@ impl DgramSocketWrap {
     unsafe {
       let handle = mem::transmute(self.handle);
       sys::uv_close(handle, Some(on_close));
+      remove_handle(handle)?;
     };
 
     // release Ref<JsFunction> in msg_queue

src/lib.rs

@@ -7,3 +7,4 @@ mod seqpacket;
 mod dgram;
 mod util;
 mod socket;
+mod uv_handle;

src/seqpacket.rs

@@ -7,6 +7,7 @@ use crate::util::{
   addr_to_string, buf_into_vec, error, get_err, resolve_libc_err, resolve_uv_err, set_clo_exec,
   set_non_block, socket_addr_to_string, uv_err_msg,
 };
+use crate::uv_handle::{insert_handle, remove_handle};
 use libc::{sockaddr, sockaddr_un, EAGAIN, EINTR, EINVAL, ENOBUFS, EWOULDBLOCK};
 use napi::{Env, JsBuffer, JsFunction, JsNumber, JsObject, JsString, JsUnknown, Ref, Result};
 use nix::errno::errno;
@@ -97,6 +98,7 @@ impl SeqpacketSocketWrap {
       handle.data = std::ptr::null_mut();
       handle
     }));
+    insert_handle(unsafe { mem::transmute(handle) })?;
 
     let uv_loop = get_loop(&env)?;
     resolve_uv_err(unsafe { sys::uv_poll_init(uv_loop, handle, fd) })?;
@@ -137,6 +139,7 @@ impl SeqpacketSocketWrap {
 
     unsafe {
       sys::uv_close(self.handle as *mut _, Some(on_close));
+      remove_handle(mem::transmute(self.handle))?;
     };
 
     // release msg_queue

src/socket.rs

@@ -4,7 +4,10 @@ use std::str::FromStr;
 
 use crate::util::{error, get_err, resolve_libc_err, resolve_uv_err};
 use libc::{c_void, sockaddr_storage, sockaddr_un};
-use napi::{Env, JsFunction, JsNumber, JsObject, JsString, JsUnknown, Ref, Result, bindgen_prelude::FromNapiValue};
+use napi::{
+  bindgen_prelude::FromNapiValue, Env, JsFunction, JsNumber, JsObject, JsString, JsUnknown, Ref,
+  Result,
+};
 use uv_sys::sys;
 
 pub(crate) fn get_loop(env: &Env) -> Result<*mut sys::uv_loop_t> {

src/util.rs

@@ -2,8 +2,8 @@ use std::ffi::CStr;
 use std::intrinsics::transmute;
 use std::mem;
 
-use libc::{sockaddr, sockaddr_un, c_char};
-use napi::{self, Error, JsBuffer, Result, JsFunction, JsObject};
+use libc::{c_char, sockaddr, sockaddr_un};
+use napi::{self, Error, JsBuffer, JsFunction, JsObject, Result};
 use nix::errno::Errno;
 use nix::fcntl::{fcntl, FcntlArg, OFlag};
 use uv_sys::sys;
@@ -37,8 +37,8 @@ pub(crate) fn socket_addr_to_string(fd: i32) -> Result<String> {
   Ok(addr_to_string(&addr))
 }
 
-pub(crate) fn error(msg: String) -> Error {
-  Error::new(napi::Status::Unknown, msg)
+pub(crate) fn error<T: ToString>(item: T) -> Error {
+  Error::new(napi::Status::Unknown, item.to_string())
 }
 
 pub(crate) fn nix_err(err: Errno) -> Error {
@@ -51,7 +51,8 @@ pub(crate) fn uv_err_msg(errno: i32) -> String {
     let ret = CStr::from_ptr(ret);
     ret
       .to_str()
-      .map_err(|_| error("parsing cstr failed".to_string())).unwrap()
+      .map_err(|_| error("parsing cstr failed".to_string()))
+      .unwrap()
       .to_string()
   };