fix: Send a close stream message when the stream input ends (#33)

We currently don't send one of these messages when the `stream` input
ends, so the server can't know that the client is done!

This change now correctly sends the end-of-stream message.

__tests__/invariants.test.ts

@@ -128,20 +128,24 @@ describe('procedures should leave no trace after finishing', async () => {
     const [input, output, close] = await client.test.echo.stream();
     input.push({ msg: '1', ignore: false });
     input.push({ msg: '2', ignore: false, end: true });
-    input.end();
 
     const result1 = await iterNext(output);
     assert(result1.ok);
     expect(result1.payload).toStrictEqual({ response: '1' });
+
+    // ensure we only have one stream despite pushing multiple messages.
+    await waitUntil(() => server.streams.size, 1);
+    input.end();
+    // ensure we no longer have any streams since the input was closed.
+    await waitUntil(() => server.streams.size, 0);
+
     const result2 = await iterNext(output);
     assert(result2.ok);
     expect(result2.payload).toStrictEqual({ response: '2' });
 
-    // ensure we exactly have one stream even after we send multiple messages
-    expect(server.streams.size).toEqual(1);
-
     const result3 = await output.next();
     assert(result3.done);
+
     close();
     // end procedure
 

router/client.ts

@@ -233,6 +233,8 @@ export const createClient = <Srv extends Server<Record<string, AnyService>>>(
 
           transport.send(m);
         }
+
+        transport.send(closeStream(transport.clientId, serverId, streamId));
       })();
 
       // transport -> output
@@ -243,6 +245,7 @@ export const createClient = <Srv extends Server<Record<string, AnyService>>>(
 
         if (isStreamClose(msg.controlFlags)) {
           outputStream.end();
+          transport.removeEventListener('message', listener);
         } else {
           outputStream.push(msg.payload);
         }
@@ -293,6 +296,7 @@ export const createClient = <Srv extends Server<Record<string, AnyService>>>(
 
         if (isStreamClose(msg.controlFlags)) {
           outputStream.end();
+          transport.removeEventListener('message', listener);
         } else {
           outputStream.push(msg.payload);
         }

util/testHelpers.ts

@@ -179,6 +179,7 @@ export function asClientStream<
     for await (const transportRes of transportOutput) {
       rawOutput.push(transportRes.payload);
     }
+    rawOutput.end();
   })();
 
   // handle
@@ -262,6 +263,7 @@ export function asClientStreamWithInitialization<
     for await (const transportRes of transportOutput) {
       rawOutput.push(transportRes.payload);
     }
+    rawOutput.end();
   })();
 
   // handle
@@ -328,6 +330,7 @@ export function asClientSubscription<
     for await (const transportRes of transportOutput) {
       rawOutput.push(transportRes.payload);
     }
+    rawOutput.end();
   })();
 
   return async (