fix(NODE-5097): set timeout on write and reset on message

src/cmap/connect.ts

@@ -428,7 +428,7 @@ function makeConnection(options: MakeConnectionOptions, _callback: Callback<Stre
       }
     }
 
-    socket.setTimeout(socketTimeoutMS);
+    socket.setTimeout(0);
     callback(undefined, socket);
   }
 

src/cmap/connection.ts

@@ -370,6 +370,9 @@ export class Connection extends TypedEventEmitter<ConnectionEvents> {
       this[kDelayedTimeoutId] = null;
     }
 
+    const socketTimeoutMS = this[kStream].timeout ?? 0;
+    this[kStream].setTimeout(0);
+
     // always emit the message, in case we are streaming
     this.emit('message', message);
     let operationDescription = this[kQueue].get(message.responseTo);
@@ -410,8 +413,7 @@ export class Connection extends TypedEventEmitter<ConnectionEvents> {
       // back in the queue with the correct requestId and will resolve not being able
       // to find the next one via the responseTo of the next streaming hello.
       this[kQueue].set(message.requestId, operationDescription);
-    } else if (operationDescription.socketTimeoutOverride) {
-      this[kStream].setTimeout(this.socketTimeoutMS);
+      this[kStream].setTimeout(socketTimeoutMS);
     }
 
     try {
@@ -707,8 +709,9 @@ function write(
   }
 
   if (typeof options.socketTimeoutMS === 'number') {
-    operationDescription.socketTimeoutOverride = true;
     conn[kStream].setTimeout(options.socketTimeoutMS);
+  } else if (conn.socketTimeoutMS !== 0) {
+    conn[kStream].setTimeout(conn.socketTimeoutMS);
   }
 
   // if command monitoring is enabled we need to modify the callback here

src/cmap/message_stream.ts

@@ -36,7 +36,6 @@ export interface OperationDescription extends BSONSerializeOptions {
   raw: boolean;
   requestId: number;
   session?: ClientSession;
-  socketTimeoutOverride?: boolean;
   agreedCompressor?: CompressorName;
   zlibCompressionLevel?: number;
   $clusterTime?: Document;

test/integration/connection-monitoring-and-pooling/connection.test.ts

@@ -5,7 +5,7 @@ import { connect } from '../../../src/cmap/connect';
 import { Connection } from '../../../src/cmap/connection';
 import { LEGACY_HELLO_COMMAND } from '../../../src/constants';
 import { Topology } from '../../../src/sdam/topology';
-import { HostAddress, ns } from '../../../src/utils';
+import { ns } from '../../../src/utils';
 import { skipBrokenAuthTestBeforeEachHook } from '../../tools/runner/hooks/configuration';
 import { assert as test, setupDatabase } from '../shared';
 
@@ -74,28 +74,6 @@ describe('Connection', function () {
       }
     });
 
-    it.skip('should support socket timeouts', {
-      // FIXME: NODE-2941
-      metadata: {
-        requires: {
-          os: '!win32' // 240.0.0.1 doesnt work for windows
-        }
-      },
-      test: function (done) {
-        const connectOptions = {
-          hostAddress: new HostAddress('240.0.0.1'),
-          connectionType: Connection,
-          connectionTimeout: 500
-        };
-
-        connect(connectOptions, err => {
-          expect(err).to.exist;
-          expect(err).to.match(/timed out/);
-          done();
-        });
-      }
-    });
-
     it('should support calling back multiple times on exhaust commands', {
       metadata: {
         requires: { apiVersion: false, mongodb: '>=4.2.0', topology: ['single'] }