wip

.eslintrc.json

@@ -131,6 +131,10 @@
       {
         "selector": "CallExpression[callee.name='clearTimeout']",
         "message": "clearTimeout must remove abort listener"
+      },
+      {
+        "selector": "CallExpression[callee.property.name='removeAllListeners'][arguments.length=0]",
+        "message": "removeAllListeners can remove error listeners leading to uncaught errors"
       }
     ],
     "@typescript-eslint/no-unused-vars": "error",

src/cmap/connection_pool.ts

@@ -374,6 +374,7 @@ export class ConnectionPool extends TypedEventEmitter<ConnectionPoolEvents> {
 
     try {
       timeout?.throwIfExpired();
+      timeout?.ref();
       return await (timeout ? Promise.race([promise, timeout]) : promise);
     } catch (error) {
       if (TimeoutError.is(error)) {
@@ -399,6 +400,7 @@ export class ConnectionPool extends TypedEventEmitter<ConnectionPoolEvents> {
       }
       throw error;
     } finally {
+      timeout?.unref();
       abortListener?.[kDispose]();
       timeout?.clear();
     }

src/index.ts

@@ -53,6 +53,7 @@ export {
   MongoClientBulkWriteCursorError,
   MongoClientBulkWriteError,
   MongoClientBulkWriteExecutionError,
+  MongoClientClosedError,
   MongoCompatibilityError,
   MongoCursorExhaustedError,
   MongoCursorInUseError,

src/mongo_client.ts

@@ -22,7 +22,7 @@ import { MONGO_CLIENT_EVENTS } from './constants';
 import { type AbstractCursor } from './cursor/abstract_cursor';
 import { Db, type DbOptions } from './db';
 import type { Encrypter } from './encrypter';
-import { MongoInvalidArgumentError } from './error';
+import { MongoClientClosedError, MongoInvalidArgumentError } from './error';
 import { MongoClientAuthProviders } from './mongo_client_auth_providers';
 import {
   type LogComponentSeveritiesClientOptions,
@@ -692,7 +692,6 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> implements
   /* @internal */
   private async _close(force = false): Promise<void> {
     try {
-      this.closeController.abort();
       // There's no way to set hasBeenClosed back to false
       Object.defineProperty(this.s, 'hasBeenClosed', {
         value: true,
@@ -701,6 +700,12 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> implements
         writable: false
       });
 
+      if (this.options.maxPoolSize === 1) {
+        // If maxPoolSize is 1 we won't be able to run anything
+        // unless we interrupt whatever is using the one connection.
+        this.closeController.abort(new MongoClientClosedError());
+      }
+
       const activeCursorCloses = Array.from(this.s.activeCursors, cursor => cursor.close());
       this.s.activeCursors.clear();
 
@@ -749,7 +754,9 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> implements
         await encrypter.close(this, force);
       }
     } finally {
-      // ignore
+      if (!this.closeController.signal.aborted) {
+        this.closeController.abort(new MongoClientClosedError());
+      }
     }
   }
 

src/sdam/monitor.ts

@@ -387,6 +387,7 @@ function checkServer(monitor: Monitor, callback: Callback<Document | null>) {
   const makeMonitoringConnection = async () => {
     const socket = await makeSocket(monitor.connectOptions, monitor.closeSignal);
     const connection = makeConnection(monitor.connectOptions, socket);
+    connection.unref();
     // The start time is after socket creation but before the handshake
     start = now();
     try {
@@ -447,15 +448,11 @@ function monitorServer(monitor: Monitor) {
 
       // if the check indicates streaming is supported, immediately reschedule monitoring
       if (useStreamingProtocol(monitor, hello?.topologyVersion)) {
-        clearOnAbortTimeout(
-          () => {
-            if (!isInCloseState(monitor)) {
-              monitor.monitorId?.wake();
-            }
-          },
-          0,
-          monitor.closeSignal
-        );
+        queueMicrotask(() => {
+          if (!isInCloseState(monitor)) {
+            monitor.monitorId?.wake();
+          }
+        });
       }
 
       done();
@@ -554,6 +551,7 @@ export class RTTPinger {
     if (connection == null) {
       connect(this.monitor.connectOptions, this.closeSignal).then(
         connection => {
+          connection.unref();
           this.measureAndReschedule(start, connection);
         },
         () => {

src/sdam/topology.ts

@@ -621,6 +621,7 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
 
     try {
       timeout?.throwIfExpired();
+      timeout?.ref();
       const server = await (timeout ? Promise.race([serverPromise, timeout]) : serverPromise);
       if (options.timeoutContext?.csotEnabled() && server.description.minRoundTripTime !== 0) {
         options.timeoutContext.minRoundTripTime = server.description.minRoundTripTime;
@@ -661,6 +662,7 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
       // Other server selection error
       throw error;
     } finally {
+      timeout?.unref();
       abortListener?.[kDispose]();
       if (options.timeoutContext?.clearServerSelectionTimeout) timeout?.clear();
     }

src/timeout.ts

@@ -39,7 +39,7 @@ export function clearOnAbortTimeout(
   }, ms);
 
   if ('unref' in id && typeof id.unref === 'function') {
-    id.unref();
+    // id.unref();
   }
 
   const abortListener = addAbortListener(closeSignal, function clearId() {
@@ -116,7 +116,9 @@ export class Timeout extends Promise<never> {
     this.start = Math.trunc(performance.now());
 
     if (rejection == null && this.duration > 0) {
-      if (options.closeSignal == null) throw new Error('incorrect timer use detected!');
+      if (options.closeSignal == null) {
+        throw new Error('You must provide a close signal to timeoutContext');
+      }
 
       this.id = clearOnAbortTimeout(
         () => {

src/utils.ts

@@ -1571,7 +1571,7 @@ export function addAbortSignalToStream(
 
   const abortListener = addAbortListener(signal, function () {
     stream.off('close', abortListener[kDispose]).off('error', abortListener[kDispose]);
-    stream.destroy(this.reason);
+    if (!stream.destroyed) stream.destroy(this.reason);
   });
   // not nearly as complex as node's eos() but... do we need all that?? sobbing emoji.
   stream.once('close', abortListener[kDispose]).once('error', abortListener[kDispose]);

test/integration/client-side-operations-timeout/client_side_operations_timeout.unit.test.ts

@@ -110,7 +110,8 @@ describe('CSOT spec unit tests', function () {
 
   describe('Client side encryption', function () {
     describe('KMS requests', function () {
-      const stateMachine = new StateMachine({} as any);
+      const closeSignal = new AbortController().signal;
+      const stateMachine = new StateMachine({} as any, undefined, closeSignal);
       const request = {
         addResponse: _response => {},
         status: {
@@ -137,7 +138,7 @@ describe('CSOT spec unit tests', function () {
           const timeoutContext = new CSOTTimeoutContext({
             timeoutMS: 500,
             serverSelectionTimeoutMS: 30000,
-            closeSignal: new AbortController().signal
+            closeSignal
           });
           const err = await stateMachine.kmsRequest(request, { timeoutContext }).catch(e => e);
           expect(err).to.be.instanceOf(MongoOperationTimeoutError);

test/integration/crud/misc_cursors.test.js

@@ -10,7 +10,7 @@ const sinon = require('sinon');
 const { Writable } = require('stream');
 const { once, on } = require('events');
 const { setTimeout } = require('timers');
-const { ReadPreference } = require('../../mongodb');
+const { ReadPreference, MongoClientClosedError } = require('../../mongodb');
 const { ServerType } = require('../../mongodb');
 const { formatSort } = require('../../mongodb');
 
@@ -1861,18 +1861,25 @@ describe('Cursor', function () {
     // insert only 2 docs in capped coll of 3
     await collection.insertMany([{ a: 1 }, { a: 1 }]);
 
-    const cursor = collection.find({}, { tailable: true, awaitData: true, maxAwaitTimeMS: 2000 });
+    const maxAwaitTimeMS = 5000;
+
+    const cursor = collection.find({}, { tailable: true, awaitData: true, maxAwaitTimeMS });
 
     await cursor.next();
     await cursor.next();
     // will block for maxAwaitTimeMS (except we are closing the client)
     const rejectedEarlyBecauseClientClosed = cursor.next().catch(error => error);
 
+    const start = performance.now();
     await client.close();
+    const end = performance.now();
+
     expect(cursor).to.have.property('closed', true);
 
+    expect(end - start, "close returns before cursor's await time").to.be.lessThan(maxAwaitTimeMS);
+
     const error = await rejectedEarlyBecauseClientClosed;
-    expect(error).to.be.instanceOf(Error); // TODO: Whatever the MongoClient aborts with.
+    expect(error).to.be.instanceOf(MongoClientClosedError);
   });
 
   it('shouldAwaitData', {

test/integration/node-specific/abstract_cursor.test.ts

@@ -416,7 +416,11 @@ describe('class AbstractCursor', function () {
       client.on('commandStarted', filterForCommands('killCursors', commands));
 
       collection = client.db('abstract_cursor_integration').collection('test');
-      internalContext = TimeoutContext.create({ timeoutMS: 1000, serverSelectionTimeoutMS: 2000 });
+      internalContext = TimeoutContext.create({
+        timeoutMS: 1000,
+        serverSelectionTimeoutMS: 2000,
+        closeSignal: new AbortController().signal
+      });
 
       context = new CursorTimeoutContext(internalContext, Symbol());
 

test/integration/uri-options/uri.test.js

@@ -112,21 +112,20 @@ describe('URI', function () {
     );
   });
 
-  it('should correctly translate uri options', {
-    metadata: { requires: { topology: 'replicaset' } },
-    test: function (done) {
+  it(
+    'should correctly translate uri options',
+    { requires: { topology: 'replicaset' } },
+    async function () {
       const config = this.configuration;
       const uri = `mongodb://${config.host}:${config.port}/${config.db}?replicaSet=${config.replicasetName}`;
 
       const client = this.configuration.newClient(uri);
-      client.connect((err, client) => {
-        expect(err).to.not.exist;
-        expect(client).to.exist;
-        expect(client.options.replicaSet).to.exist.and.equal(config.replicasetName);
-        client.close(done);
-      });
+      await client.connect();
+      expect(client).to.exist;
+      expect(client.options.replicaSet).to.exist.and.equal(config.replicasetName);
+      await client.close();
     }
-  });
+  );
 
   it('should generate valid credentials with X509', {
     metadata: { requires: { topology: 'single' } },