feat(NODE-6305): Add CSOT support to tailable cursors (#4218)

Co-authored-by: Neal Beeken <neal.beeken@mongodb.com>

src/cursor/abstract_cursor.ts

@@ -209,12 +209,35 @@ export abstract class AbstractCursor<
         options.readPreference && options.readPreference instanceof ReadPreference
           ? options.readPreference
           : ReadPreference.primary,
-      ...pluckBSONSerializeOptions(options)
+      ...pluckBSONSerializeOptions(options),
+      timeoutMS: options.timeoutMS,
+      tailable: options.tailable,
+      awaitData: options.awaitData
     };
-    this.cursorOptions.timeoutMS = options.timeoutMS;
     if (this.cursorOptions.timeoutMS != null) {
-      if (options.tailable && this.cursorOptions.timeoutMode === CursorTimeoutMode.LIFETIME) {
-        throw new MongoInvalidArgumentError("Cannot set tailable cursor's timeoutMode to LIFETIME");
+      if (options.timeoutMode == null) {
+        if (options.tailable) {
+          this.cursorOptions.timeoutMode = CursorTimeoutMode.ITERATION;
+
+          if (options.awaitData) {
+            if (
+              options.maxAwaitTimeMS != null &&
+              options.maxAwaitTimeMS >= this.cursorOptions.timeoutMS
+            )
+              throw new MongoInvalidArgumentError(
+                'Cannot specify maxAwaitTimeMS >= timeoutMS for a tailable awaitData cursor'
+              );
+          }
+        } else {
+          this.cursorOptions.timeoutMode = CursorTimeoutMode.LIFETIME;
+        }
+      } else {
+        if (options.tailable && this.cursorOptions.timeoutMode === CursorTimeoutMode.LIFETIME) {
+          throw new MongoInvalidArgumentError(
+            "Cannot set tailable cursor's timeoutMode to LIFETIME"
+          );
+        }
+        this.cursorOptions.timeoutMode = options.timeoutMode;
       }
       this.cursorOptions.timeoutMode =
         options.timeoutMode ??
@@ -223,6 +246,8 @@ export abstract class AbstractCursor<
       if (options.timeoutMode != null)
         throw new MongoInvalidArgumentError('Cannot set timeoutMode without setting timeoutMS');
     }
+
+    // Set for initial command
     this.cursorOptions.omitMaxTimeMS =
       this.cursorOptions.timeoutMS != null &&
       ((this.cursorOptions.timeoutMode === CursorTimeoutMode.ITERATION &&
@@ -781,15 +806,17 @@ export abstract class AbstractCursor<
         'Unexpected null selectedServer. A cursor creating command should have set this'
       );
     }
+    const getMoreOptions = {
+      ...this.cursorOptions,
+      session: this.cursorSession,
+      batchSize
+    };
+
     const getMoreOperation = new GetMoreOperation(
       this.cursorNamespace,
       this.cursorId,
       this.selectedServer,
-      {
-        ...this.cursorOptions,
-        session: this.cursorSession,
-        batchSize
-      }
+      getMoreOptions
     );
 
     return await executeOperation(this.cursorClient, getMoreOperation, this.timeoutContext);
@@ -814,6 +841,8 @@ export abstract class AbstractCursor<
     }
     try {
       const state = await this._initialize(this.cursorSession);
+      // Set omitMaxTimeMS to the value needed for subsequent getMore calls
+      this.cursorOptions.omitMaxTimeMS = this.cursorOptions.timeoutMS != null;
       const response = state.response;
       this.selectedServer = state.server;
       this.cursorId = response.id;
@@ -866,9 +895,9 @@ export abstract class AbstractCursor<
     } catch (error) {
       try {
         await this.cleanup(undefined, error);
-      } catch (error) {
+      } catch (cleanupError) {
         // `cleanupCursor` should never throw, squash and throw the original error
-        squashError(error);
+        squashError(cleanupError);
       }
       throw error;
     }

src/cursor/run_command_cursor.ts

@@ -23,6 +23,8 @@ export type RunCursorCommandOptions = {
   timeoutMS?: number;
   /** @internal */
   timeoutMode?: CursorTimeoutMode;
+  tailable?: boolean;
+  awaitData?: boolean;
 } & BSONSerializeOptions;
 
 /** @public */

src/mongo_client.ts

@@ -482,6 +482,11 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> implements
     return this.s.bsonOptions;
   }
 
+  /** @internal */
+  get timeoutMS(): number | undefined {
+    return this.options.timeoutMS;
+  }
+
   /**
    * Executes a client bulk write operation, available on server 8.0+.
    * @param models - The client bulk write models.

src/operations/create_collection.ts

@@ -17,6 +17,7 @@ import { Aspect, defineAspects } from './operation';
 const ILLEGAL_COMMAND_FIELDS = new Set([
   'w',
   'wtimeout',
+  'timeoutMS',
   'j',
   'fsync',
   'autoIndexId',

test/benchmarks/driverBench/common.js

@@ -24,7 +24,9 @@ function loadSpecString(filePath) {
 }
 
 function makeClient() {
-  this.client = new MongoClient(process.env.MONGODB_URI || 'mongodb://127.0.0.1:27017');
+  this.client = new MongoClient(process.env.MONGODB_URI || 'mongodb://127.0.0.1:27017', {
+    timeoutMS: 0
+  });
 }
 
 function connectClient() {

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

@@ -77,7 +77,7 @@ describe('CSOT spec prose tests', function () {
     beforeEach(async function () {
       await internalClient
         .db('db')
-        .collection('coll')
+        .collection('bulkWriteTest')
         .drop()
         .catch(() => null);
       await internalClient.db('admin').command(failpoint);
@@ -93,7 +93,7 @@ describe('CSOT spec prose tests', function () {
       const oneMBDocs = Array.from({ length: 50 }, (_, _id) => ({ _id, a }));
       const error = await client
         .db('db')
-        .collection<{ _id: number; a: Uint8Array }>('coll')
+        .collection<{ _id: number; a: Uint8Array }>('bulkWriteTest')
         .insertMany(oneMBDocs)
         .catch(error => error);
 
@@ -265,6 +265,7 @@ describe('CSOT spec prose tests', function () {
   });
 
   context('5. Blocking Iteration Methods', () => {
+    const metadata = { requires: { mongodb: '>=4.4' } };
     /**
      * Tests in this section MUST only be run against server versions 4.4 and higher and only apply to drivers that have a
      * blocking method for cursor iteration that executes `getMore` commands in a loop until a document is available or an
@@ -276,7 +277,7 @@ describe('CSOT spec prose tests', function () {
       data: {
         failCommands: ['getMore'],
         blockConnection: true,
-        blockTimeMS: 20
+        blockTimeMS: 90
       }
     };
     let internalClient: MongoClient;
@@ -286,15 +287,25 @@ describe('CSOT spec prose tests', function () {
 
     beforeEach(async function () {
       internalClient = this.configuration.newClient();
-      await internalClient.db('db').dropCollection('coll');
+      await internalClient
+        .db('db')
+        .collection('coll')
+        .drop()
+        .catch(() => null);
       // Creating capped collection to be able to create tailable find cursor
       const coll = await internalClient
         .db('db')
         .createCollection('coll', { capped: true, size: 1_000_000 });
       await coll.insertOne({ x: 1 });
       await internalClient.db().admin().command(failpoint);
 
-      client = this.configuration.newClient(undefined, { timeoutMS: 20, monitorCommands: true });
+      client = this.configuration.newClient(undefined, {
+        monitorCommands: true,
+        timeoutMS: 100,
+        minPoolSize: 20
+      });
+      await client.connect();
+
       commandStarted = [];
       commandSucceeded = [];
 
@@ -337,11 +348,11 @@ describe('CSOT spec prose tests', function () {
        * 1. Verify that a `find` command and two `getMore` commands were executed against the `db.coll` collection during the test.
        */
 
-      it.skip('send correct number of finds and getMores', async function () {
+      it('send correct number of finds and getMores', metadata, async function () {
         const cursor = client
           .db('db')
           .collection('coll')
-          .find({}, { tailable: true, awaitData: true })
+          .find({}, { tailable: true })
           .project({ _id: 0 });
         const doc = await cursor.next();
         expect(doc).to.deep.equal({ x: 1 });
@@ -358,7 +369,7 @@ describe('CSOT spec prose tests', function () {
         expect(commandStarted.filter(e => e.command.find != null)).to.have.lengthOf(1);
         // Expect 2 getMore
         expect(commandStarted.filter(e => e.command.getMore != null)).to.have.lengthOf(2);
-      }).skipReason = 'TODO(NODE-6305)';
+      });
     });
 
     context('Change Streams', () => {
@@ -383,8 +394,11 @@ describe('CSOT spec prose tests', function () {
        *    - Expect this to fail with a timeout error.
        * 1. Verify that an `aggregate` command and two `getMore` commands were executed against the `db.coll` collection during the test.
        */
-      it.skip('sends correct number of aggregate and getMores', async function () {
-        const changeStream = client.db('db').collection('coll').watch();
+      it.skip('sends correct number of aggregate and getMores', metadata, async function () {
+        const changeStream = client
+          .db('db')
+          .collection('coll')
+          .watch([], { timeoutMS: 20, maxAwaitTimeMS: 19 });
         const maybeError = await changeStream.next().then(
           () => null,
           e => e
@@ -397,9 +411,9 @@ describe('CSOT spec prose tests', function () {
         const getMores = commandStarted.filter(e => e.command.getMore != null).map(e => e.command);
         // Expect 1 aggregate
         expect(aggregates).to.have.lengthOf(1);
-        // Expect 1 getMore
-        expect(getMores).to.have.lengthOf(1);
-      }).skipReason = 'TODO(NODE-6305)';
+        // Expect 2 getMores
+        expect(getMores).to.have.lengthOf(2);
+      }).skipReason = 'TODO(NODE-6387)';
     });
   });
 

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

@@ -25,7 +25,12 @@ const skippedTests = {
   'Non-tailable cursor lifetime remaining timeoutMS applied to getMore if timeoutMode is unset':
     'TODO(DRIVERS-2965)',
   'maxTimeMS value in the command is less than timeoutMS':
-    'TODO(DRIVERS-2970): see modified test in unified-csot-node-specs'
+    'TODO(DRIVERS-2970): see modified test in unified-csot-node-specs',
+  'Tailable cursor awaitData iteration timeoutMS is refreshed for getMore - failure':
+    'TODO(DRIVERS-2965)',
+  'Tailable cursor iteration timeoutMS is refreshed for getMore - failure': 'TODO(DRIVERS-2965)',
+  'timeoutMS is refreshed for getMore - failure':
+    'TODO(DRIVERS-2965): see modified test in unified-csot-node-specs' // Skipping for both tailable awaitData and tailable non-awaitData cursors
 };
 
 describe('CSOT spec tests', function () {