fix(NODE-6845): ensure internal rejections are handled

.gitignore

@@ -103,6 +103,7 @@ secrets-export.fish
 mo-expansion.sh
 mo-expansion.yml
 expansions.sh
+uri.txt
 
 .drivers-tools/
 

.mocharc.js

@@ -7,6 +7,7 @@ module.exports = {
   require: [
     'source-map-support/register',
     'ts-node/register',
+    'test/tools/runner/throw_rejections.cjs',
     'test/tools/runner/chai_addons.ts',
     'test/tools/runner/ee_checker.ts'
   ],

src/cursor/abstract_cursor.ts

@@ -1146,50 +1146,59 @@ class ReadableCursorStream extends Readable {
       return;
     }
 
-    this._cursor.next().then(
-      result => {
-        if (result == null) {
-          this.push(null);
-        } else if (this.destroyed) {
-          this._cursor.close().then(undefined, squashError);
-        } else {
-          if (this.push(result)) {
-            return this._readNext();
+    this._cursor
+      .next()
+      .then(
+        // result from next()
+        result => {
+          if (result == null) {
+            this.push(null);
+          } else if (this.destroyed) {
+            this._cursor.close().then(undefined, squashError);
+          } else {
+            if (this.push(result)) {
+              return this._readNext();
+            }
+
+            this._readInProgress = false;
+          }
+        },
+        // error from next()
+        err => {
+          // NOTE: This is questionable, but we have a test backing the behavior. It seems the
+          //       desired behavior is that a stream ends cleanly when a user explicitly closes
+          //       a client during iteration. Alternatively, we could do the "right" thing and
+          //       propagate the error message by removing this special case.
+          if (err.message.match(/server is closed/)) {
+            this._cursor.close().then(undefined, squashError);
+            return this.push(null);
           }
 
-          this._readInProgress = false;
-        }
-      },
-      err => {
-        // NOTE: This is questionable, but we have a test backing the behavior. It seems the
-        //       desired behavior is that a stream ends cleanly when a user explicitly closes
-        //       a client during iteration. Alternatively, we could do the "right" thing and
-        //       propagate the error message by removing this special case.
-        if (err.message.match(/server is closed/)) {
-          this._cursor.close().then(undefined, squashError);
-          return this.push(null);
-        }
+          // NOTE: This is also perhaps questionable. The rationale here is that these errors tend
+          //       to be "operation was interrupted", where a cursor has been closed but there is an
+          //       active getMore in-flight. This used to check if the cursor was killed but once
+          //       that changed to happen in cleanup legitimate errors would not destroy the
+          //       stream. There are change streams test specifically test these cases.
+          if (err.message.match(/operation was interrupted/)) {
+            return this.push(null);
+          }
 
-        // NOTE: This is also perhaps questionable. The rationale here is that these errors tend
-        //       to be "operation was interrupted", where a cursor has been closed but there is an
-        //       active getMore in-flight. This used to check if the cursor was killed but once
-        //       that changed to happen in cleanup legitimate errors would not destroy the
-        //       stream. There are change streams test specifically test these cases.
-        if (err.message.match(/operation was interrupted/)) {
-          return this.push(null);
+          // NOTE: The two above checks on the message of the error will cause a null to be pushed
+          //       to the stream, thus closing the stream before the destroy call happens. This means
+          //       that either of those error messages on a change stream will not get a proper
+          //       'error' event to be emitted (the error passed to destroy). Change stream resumability
+          //       relies on that error event to be emitted to create its new cursor and thus was not
+          //       working on 4.4 servers because the error emitted on failover was "interrupted at
+          //       shutdown" while on 5.0+ it is "The server is in quiesce mode and will shut down".
+          //       See NODE-4475.
+          return this.destroy(err);
         }
-
-        // NOTE: The two above checks on the message of the error will cause a null to be pushed
-        //       to the stream, thus closing the stream before the destroy call happens. This means
-        //       that either of those error messages on a change stream will not get a proper
-        //       'error' event to be emitted (the error passed to destroy). Change stream resumability
-        //       relies on that error event to be emitted to create its new cursor and thus was not
-        //       working on 4.4 servers because the error emitted on failover was "interrupted at
-        //       shutdown" while on 5.0+ it is "The server is in quiesce mode and will shut down".
-        //       See NODE-4475.
-        return this.destroy(err);
-      }
-    );
+      )
+      // if either of the above handlers throw
+      .catch(error => {
+        this._readInProgress = false;
+        this.destroy(error);
+      });
   }
 }
 

src/sdam/server.ts

@@ -48,6 +48,7 @@ import {
   maxWireVersion,
   type MongoDBNamespace,
   noop,
+  squashError,
   supportsRetryableWrites
 } from '../utils';
 import { throwIfWriteConcernError } from '../write_concern';
@@ -345,9 +346,10 @@ export class Server extends TypedEventEmitter<ServerEvents> {
         operationError instanceof MongoError &&
         operationError.code === MONGODB_ERROR_CODES.Reauthenticate
       ) {
-        reauthPromise = this.pool.reauthenticate(conn).catch(error => {
+        reauthPromise = this.pool.reauthenticate(conn);
+        reauthPromise.then(undefined, error => {
           reauthPromise = null;
-          throw error;
+          squashError(error);
         });
 
         await abortable(reauthPromise, options);
@@ -368,9 +370,10 @@ export class Server extends TypedEventEmitter<ServerEvents> {
       if (session?.pinnedConnection !== conn) {
         if (reauthPromise != null) {
           // The reauth promise only exists if it hasn't thrown.
-          void reauthPromise.finally(() => {
+          const checkBackIn = () => {
             this.pool.checkIn(conn);
-          });
+          };
+          void reauthPromise.then(checkBackIn, checkBackIn);
         } else {
           this.pool.checkIn(conn);
         }

src/timeout.ts

@@ -3,7 +3,7 @@ import { clearTimeout, setTimeout } from 'timers';
 import { type Document } from './bson';
 import { MongoInvalidArgumentError, MongoOperationTimeoutError, MongoRuntimeError } from './error';
 import { type ClientSession } from './sessions';
-import { csotMin, noop } from './utils';
+import { csotMin, noop, squashError } from './utils';
 
 /** @internal */
 export class TimeoutError extends Error {
@@ -102,7 +102,13 @@ export class Timeout extends Promise<never> {
   }
 
   throwIfExpired(): void {
-    if (this.timedOut) throw new TimeoutError('Timed out', { duration: this.duration });
+    if (this.timedOut) {
+      // This method is invoked when someone wants to throw immediately instead of await the result of this promise
+      // Since they won't be handling the rejection from the promise (because we're about to throw here)
+      // attach handling to prevent this from bubbling up to Node.js
+      this.then(undefined, squashError);
+      throw new TimeoutError('Timed out', { duration: this.duration });
+    }
   }
 
   public static expires(duration: number, unref?: true): Timeout {

test/integration/change-streams/change_stream.test.ts

@@ -819,6 +819,7 @@ describe('Change Streams', function () {
           const write = lastWrite();
 
           const nextP = changeStream.next();
+          nextP.catch(() => null);
 
           await changeStream.close();
 

test/integration/client-side-operations-timeout/node_csot.test.ts

@@ -1023,7 +1023,8 @@ describe('CSOT driver tests', metadata, () => {
 
         beforeEach(async function () {
           cs = client.db('db').collection('coll').watch([], { timeoutMS: 120 });
-          const _changePromise = once(cs, 'change');
+          cs.once('change', () => null);
+
           await once(cs.cursor, 'init');
 
           await internalClient.db().admin().command(failpoint);

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

@@ -753,7 +753,7 @@ describe('AbortSignal support', () => {
         if (args[1].find != null) {
           commandStub.restore();
           controller.abort();
-          throw new ReAuthenticationError({});
+          throw new ReAuthenticationError({ message: 'This is a fake reauthentication error' });
         }
         return commandStub.wrappedMethod.apply(this, args);
       });
@@ -792,8 +792,9 @@ describe('AbortSignal support', () => {
     describe('if reauth throws', () => {
       beforeEach(() => {
         sinon.stub(ConnectionPool.prototype, 'reauthenticate').callsFake(async function () {
+          const error = new Error('Rejecting reauthenticate for testing');
           await sleep(1000);
-          throw new Error();
+          throw error;
         });
       });
 

test/integration/node-specific/examples/change_streams.test.js

@@ -60,7 +60,9 @@ maybeDescribe('examples(change-stream):', function () {
   it('Open A Change Stream', {
     metadata: { requires: { topology: ['replicaset'], mongodb: '>=3.6.0' } },
     test: async function () {
-      const looper = new Looper(() => db.collection('inventory').insertOne({ a: 1 }));
+      const looper = new Looper(async () => {
+        await db.collection('inventory').insertOne({ a: 1 });
+      });
       looper.run();
 
       // Start Changestream Example 1

test/integration/shared.js

@@ -90,32 +90,25 @@ function ignoreNsNotFound(err) {
   if (!err.message.match(/ns not found/)) throw err;
 }
 
-function setupDatabase(configuration, dbsToClean) {
+async function setupDatabase(configuration, dbsToClean) {
   dbsToClean = Array.isArray(dbsToClean) ? dbsToClean : [];
-  var configDbName = configuration.db;
-  var client = configuration.newClient(configuration.writeConcernMax(), {
-    maxPoolSize: 1
-  });
+  const configDbName = configuration.db;
 
   dbsToClean.push(configDbName);
 
-  return client
-    .connect()
-    .then(() =>
-      dbsToClean.reduce(
-        (result, dbName) =>
-          result
-            .then(() =>
-              client.db(dbName).command({ dropAllUsersFromDatabase: 1, writeConcern: { w: 1 } })
-            )
-            .then(() => client.db(dbName).dropDatabase({ writeConcern: { w: 1 } })),
-        Promise.resolve()
-      )
-    )
-    .then(
-      () => client.close(),
-      err => client.close(() => Promise.reject(err))
-    );
+  const client = configuration.newClient();
+  try {
+    for (const dbName of dbsToClean) {
+      const db = await client.db(dbName);
+      for await (const { name } of db.listCollections({}, { nameOnly: true })) {
+        const collection = db.collection(name);
+        await collection.deleteMany({}).catch(() => null);
+        await collection.drop().catch(() => null);
+      }
+    }
+  } finally {
+    await client.close();
+  }
 }
 
 /**

test/manual/mocharc.js

@@ -4,7 +4,11 @@ const [major] = process.versions.node.split('.');
 
 /** @type {import("mocha").MochaOptions} */
 module.exports = {
-  require: ['ts-node/register', 'test/tools/runner/chai_addons.ts'],
+  require: [
+    'ts-node/register',
+    'test/tools/runner/throw_rejections.cjs',
+    'test/tools/runner/chai_addons.ts'
+  ],
   reporter: 'test/tools/reporter/mongodb_reporter.js',
   failZero: true,
   color: true,

test/mocha_lambda.js

@@ -4,7 +4,10 @@ const [major] = process.versions.node.split('.');
 
 /** @type {import("mocha").MochaOptions} */
 module.exports = {
-  require: ['test/integration/node-specific/examples/setup.js'],
+  require: [
+    'test/tools/runner/throw_rejections.cjs',
+    'test/integration/node-specific/examples/setup.js'
+  ],
   extension: ['js'],
   ui: 'test/tools/runner/metadata_ui.js',
   recursive: true,

test/mocha_mongodb.js

@@ -7,6 +7,7 @@ module.exports = {
   require: [
     'source-map-support/register',
     'ts-node/register',
+    'test/tools/runner/throw_rejections.cjs',
     'test/tools/runner/chai_addons.ts',
     'test/tools/runner/ee_checker.ts',
     'test/tools/runner/hooks/configuration.ts',

test/tools/runner/throw_rejections.cjs

@@ -0,0 +1,6 @@
+// eslint-disable-next-line @typescript-eslint/no-require-imports
+const process = require('process');
+
+process.on('unhandledRejection', error => {
+  throw error;
+});