Set connection status to ERROR when closed due to protocol error

Amends DuplexConnection#close to accept an optional error indicating that the connection is being closed due to that error.

Updates implementations to handle this error and report it to consumers.

Updates RSocketMachine to pass protocol-level connection errors to close

Adds/updates tests to check for handling this parameter

Author: ada-waffles

packages/rsocket-core/src/RSocketMachine.js

@@ -598,8 +598,7 @@ class RSocketMachineImpl<D, M> implements RSocketMachine<D, M> {
   };
 
   _handleConnectionError(error: Error): void {
-    this._handleError(error);
-    this._connection.close();
+    this._connection.close(error);
     const errorHandler = this._errorHandler;
     if (errorHandler) {
       errorHandler(error);

packages/rsocket-core/src/RSocketResumableTransport.js

@@ -156,8 +156,8 @@ export default class RSocketResumableTransport implements DuplexConnection {
     this._statusSubscribers = new Set();
   }
 
-  close(): void {
-    this._close();
+  close(error?: Error): void {
+    this._close(error);
   }
 
   connect(): void {
@@ -275,13 +275,18 @@ export default class RSocketResumableTransport implements DuplexConnection {
     if (this._isTerminated()) {
       return;
     }
-    if (error) {
-      this._setConnectionStatus({error, kind: 'ERROR'});
-    } else {
-      this._setConnectionStatus(CONNECTION_STATUS.CLOSED);
-    }
+
+    const status = error ? {error, kind: 'ERROR'} : CONNECTION_STATUS.CLOSED;
+    this._setConnectionStatus(status);
+
     const receivers = this._receivers;
-    receivers.forEach(r => r.onComplete());
+    receivers.forEach(subscriber => {
+      if (error) {
+        subscriber.onError(error);
+      } else {
+        subscriber.onComplete();
+      }
+    });
     receivers.clear();
 
     const senders = this._senders;

packages/rsocket-core/src/ReassemblyDuplexConnection.js

@@ -37,8 +37,8 @@ export class ReassemblyDuplexConnection implements DuplexConnection {
       .lift(actual => new ReassemblySubscriber(actual));
   }
 
-  close(): void {
-    this._source.close();
+  close(error?: Error): void {
+    this._source.close(error);
   }
 
   connect(): void {

packages/rsocket-core/src/__mocks__/MockDuplexConnection.js

@@ -28,8 +28,12 @@ export function genMockConnection() {
   let closed = false;
 
   const connection = {
-    close: jest.fn(() => {
-      connection.mock.close();
+    close: jest.fn(error => {
+      if (error) {
+        connection.mock.closeWithError(error);
+      } else {
+        connection.mock.close();
+      }
     }),
     connect: jest.fn(),
     connectionStatus: jest.fn(() => status),

packages/rsocket-core/src/__tests__/RSocketClient-test.js

@@ -310,7 +310,7 @@ describe('RSocketClient', () => {
       expect(errors.values().next().value).toEqual(
         `No keep-alive acks for ${keepAliveTimeout} millis`,
       );
-      expect(status.kind).toEqual('CLOSED');
+      expect(status.kind).toEqual('ERROR');
 
       jest.advanceTimersByTime(keepAliveTimeout);
     });

packages/rsocket-core/src/__tests__/RSocketResumableTransport-test.js

@@ -687,4 +687,59 @@ describe('RSocketResumableTransport', () => {
       expect(currentTransport.sendOne.mock.calls.length).toBe(0);
     });
   });
+
+  describe('post-connect() APIs', () => {
+    beforeEach(() => {
+      resumableTransport.connect();
+      currentTransport.mock.connect();
+    });
+
+    describe('close()', () => {
+      describe('given an error', () => {
+        it('closes the transport', () => {
+          resumableTransport.close(new Error());
+          expect(currentTransport.close.mock.calls.length).toBe(1);
+        });
+
+        it('sets the status to ERROR with the given error', () => {
+          const error = new Error();
+          resumableTransport.close(error);
+          expect(resumableStatus.kind).toBe('ERROR');
+          expect(resumableStatus.error).toBe(error);
+        });
+
+        it('calls receive.onError with the given error', () => {
+          const onError = jest.fn();
+          const onSubscribe = subscription =>
+            subscription.request(Number.MAX_SAFE_INTEGER);
+          resumableTransport.receive().subscribe({onError, onSubscribe});
+          const error = new Error();
+          resumableTransport.close(error);
+          expect(onError.mock.calls.length).toBe(1);
+          expect(onError.mock.calls[0][0]).toBe(error);
+        });
+      });
+
+      describe('not given an error', () => {
+        it('closes the transport', () => {
+          resumableTransport.close();
+          expect(currentTransport.close.mock.calls.length).toBe(1);
+        });
+
+        it('sets the status to CLOSED', () => {
+          resumableTransport.close();
+          expect(resumableStatus.kind).toBe('CLOSED');
+        });
+
+        it('calls receive.onComplete', () => {
+          const onComplete = jest.fn();
+          const onSubscribe = subscription =>
+            subscription.request(Number.MAX_SAFE_INTEGER);
+          resumableTransport.receive().subscribe({onComplete, onSubscribe});
+          resumableTransport.close();
+          expect(onComplete.mock.calls.length).toBe(1);
+        });
+      });
+    });
+  });
 });

packages/rsocket-tcp-client/src/RSocketTcpClient.js

@@ -60,8 +60,8 @@ export class RSocketTcpConnection implements DuplexConnection {
     }
   }
 
-  close(): void {
-    this._close();
+  close(error?: Error): void {
+    this._close(error);
   }
 
   connect(): void {

packages/rsocket-tcp-client/src/__tests__/RSocketTcpClient-test.js

@@ -98,29 +98,62 @@ describe('RSocketTcpClient', () => {
     });
 
     describe('close()', () => {
-      it('closes the socket', () => {
-        client.close();
-        expect(socket.end.mock.calls.length).toBe(1);
-      });
+      describe('given an error', () => {
+        it('closes the socket', () => {
+          client.close(new Error());
+          expect(socket.end.mock.calls.length).toBe(1);
+        });
 
-      it('sets the status to CLOSED', () => {
-        let status;
-        client.connectionStatus().subscribe({
-          onNext: _status => (status = _status),
-          onSubscribe: subscription =>
-            subscription.request(Number.MAX_SAFE_INTEGER),
+        it('sets the status to ERROR with the given error', () => {
+          let status;
+          client.connectionStatus().subscribe({
+            onNext: _status => (status = _status),
+            onSubscribe: subscription =>
+              subscription.request(Number.MAX_SAFE_INTEGER),
+          });
+          const error = new Error();
+          client.close(error);
+          expect(status.kind).toBe('ERROR');
+          expect(status.error).toBe(error);
+        });
+
+        it('calls receive.onError with the given error', () => {
+          const onError = jest.fn();
+          const onSubscribe = subscription =>
+            subscription.request(Number.MAX_SAFE_INTEGER);
+          client.receive().subscribe({onError, onSubscribe});
+          const error = new Error();
+          client.close(error);
+          expect(onError.mock.calls.length).toBe(1);
+          expect(onError.mock.calls[0][0]).toBe(error);
         });
-        client.close();
-        expect(status.kind).toBe('CLOSED');
       });
 
-      it('calls receive.onComplete', () => {
-        const onComplete = jest.fn();
-        const onSubscribe = subscription =>
-          subscription.request(Number.MAX_SAFE_INTEGER);
-        client.receive().subscribe({onComplete, onSubscribe});
-        client.close();
-        expect(onComplete.mock.calls.length).toBe(1);
+      describe('not given an error', () => {
+        it('closes the socket', () => {
+          client.close();
+          expect(socket.end.mock.calls.length).toBe(1);
+        });
+
+        it('sets the status to CLOSED', () => {
+          let status;
+          client.connectionStatus().subscribe({
+            onNext: _status => (status = _status),
+            onSubscribe: subscription =>
+              subscription.request(Number.MAX_SAFE_INTEGER),
+          });
+          client.close();
+          expect(status.kind).toBe('CLOSED');
+        });
+
+        it('calls receive.onComplete', () => {
+          const onComplete = jest.fn();
+          const onSubscribe = subscription =>
+            subscription.request(Number.MAX_SAFE_INTEGER);
+          client.receive().subscribe({onComplete, onSubscribe});
+          client.close();
+          expect(onComplete.mock.calls.length).toBe(1);
+        });
       });
     });
 

packages/rsocket-types/src/ReactiveSocketTypes.js

@@ -118,10 +118,11 @@ export interface DuplexConnection {
   receive(): Flowable<Frame>,
 
   /**
-   * Close the underlying connection, emitting `onComplete` on the receive()
-   * Publisher.
+   * Close the underlying connection, optionally providing an error as reason.
+   * If an error is passed, emits `onError` on the receive() Publisher.
+   * If no error is passed, emits `onComplete` on the receive() Publisher.
    */
-  close(): void,
+  close(error?: Error): void,
 
   /**
    * Open the underlying connection. Throws if the connection is already in

packages/rsocket-websocket-client/src/RSocketWebSocketClient.js

@@ -62,8 +62,8 @@ export default class RSocketWebSocketClient implements DuplexConnection {
     this._statusSubscribers = new Set();
   }
 
-  close(): void {
-    this._close();
+  close(error?: Error): void {
+    this._close(error);
   }
 
   connect(): void {