grpc-js: add client streaming RPC support

This commit adds client streaming RPC support.

packages/grpc-js/src/server-call.ts

@@ -24,6 +24,7 @@ import {StatusObject} from './call-stream';
 import {Status} from './constants';
 import {Deserialize, Serialize} from './make-client';
 import {Metadata} from './metadata';
+import {StreamDecoder} from './stream-decoder';
 
 function noop(): void {}
 
@@ -100,6 +101,7 @@ export class ServerUnaryCallImpl<RequestType, ResponseType> extends EventEmitter
 export class ServerReadableStreamImpl<RequestType, ResponseType> extends
     Readable implements ServerReadableStream<RequestType, ResponseType> {
   cancelled: boolean;
+  private decoder: StreamDecoder;
 
   constructor(
       private call: Http2ServerCallStream<RequestType, ResponseType>,
@@ -107,6 +109,44 @@ export class ServerReadableStreamImpl<RequestType, ResponseType> extends
       private _deserialize: Deserialize<RequestType>) {
     super({objectMode: true});
     this.cancelled = false;
+    this.decoder = new StreamDecoder();
+
+    const http2Stream = this.call._getHttp2Stream();
+
+    http2Stream.on('data', async (data: Buffer) => {
+      const message = this.decoder.write(data);
+
+      if (message === null) {
+        return;
+      }
+
+      try {
+        const deserialized = await this.call.deserializeMessage(message);
+
+        if (!this.push(deserialized)) {
+          http2Stream.pause();
+        }
+      } catch (err) {
+        err.code = Status.INTERNAL;
+        this.emit('error', err);
+      }
+    });
+
+    http2Stream.once('end', () => {
+      this.push(null);
+    });
+  }
+
+  _read(size: number) {
+    this.call._getHttp2Stream().resume();
+  }
+
+  deserialize(input: Buffer): RequestType|null {
+    if (input === null || input === undefined) {
+      return null;
+    }
+
+    return this._deserialize(input);
   }
 
   getPeer(): string {
@@ -468,6 +508,10 @@ export class Http2ServerCallStream<RequestType, ResponseType> extends
     this.sendMetadata();
     return this.stream.write(chunk);
   }
+
+  _getHttp2Stream(): http2.ServerHttp2Stream {
+    return this.stream;
+  }
 }
 
 // tslint:disable:no-any

packages/grpc-js/src/server.ts

@@ -314,7 +314,22 @@ function handleClientStreaming<RequestType, ResponseType>(
     call: Http2ServerCallStream<RequestType, ResponseType>,
     handler: ClientStreamingHandler<RequestType, ResponseType>,
     metadata: Metadata): void {
-  throw new Error('not implemented yet');
+  const stream = new ServerReadableStreamImpl<RequestType, ResponseType>(
+      call, metadata, handler.deserialize);
+
+  function respond(
+      err: ServiceError|null, value: ResponseType|null, trailer?: Metadata,
+      flags?: number) {
+    stream.destroy();
+    call.sendUnaryMessage(err, value, trailer, flags);
+  }
+
+  if (call.cancelled) {
+    return;
+  }
+
+  stream.on('error', respond);
+  handler.func(stream, respond);
 }
 
 

packages/grpc-js/test/test-server-errors.ts

@@ -126,6 +126,17 @@ describe('Client malformed response handling', () => {
     });
   });
 
+  it('should get an INTERNAL status with a client stream call', (done) => {
+    const call = client.clientStream((err: ServiceError, data: any) => {
+      assert(err);
+      assert.strictEqual(err.code, grpc.status.INTERNAL);
+      done();
+    });
+
+    call.write({});
+    call.end();
+  });
+
   it('should get an INTERNAL status with a server stream call', (done) => {
     const call = client.serverStream({});
 
@@ -229,6 +240,17 @@ describe('Server serialization failure handling', () => {
     });
   });
 
+  it('should get an INTERNAL status with a client stream call', (done) => {
+    const call = client.clientStream((err: ServiceError, data: any) => {
+      assert(err);
+      assert.strictEqual(err.code, grpc.status.INTERNAL);
+      done();
+    });
+
+    call.write({});
+    call.end();
+  });
+
   it('should get an INTERNAL status with a server stream call', (done) => {
     const call = client.serverStream({});
 
@@ -397,6 +419,18 @@ describe('Other conditions', () => {
       });
     });
 
+    it('should respond correctly to a client stream', (done) => {
+      const call =
+          misbehavingClient.clientStream((err: ServiceError, data: any) => {
+            assert(err);
+            assert.strictEqual(err.code, grpc.status.INTERNAL);
+            done();
+          });
+
+      call.write(badArg);
+      call.end();
+    });
+
     it('should respond correctly to a server stream', (done) => {
       const call = misbehavingClient.serverStream(badArg);
 
@@ -457,6 +491,56 @@ describe('Other conditions', () => {
       });
     });
 
+    it('should be present when a client stream call succeeds', (done) => {
+      let count = 0;
+      const call = client.clientStream((err: ServiceError, data: any) => {
+        assert.ifError(err);
+
+        count++;
+        if (count === 2) {
+          done();
+        }
+      });
+
+      call.write({error: false});
+      call.write({error: false});
+      call.end();
+
+      call.on('status', (status: grpc.StatusObject) => {
+        assert.deepStrictEqual(status.metadata.get('trailer-present'), ['yes']);
+
+        count++;
+        if (count === 2) {
+          done();
+        }
+      });
+    });
+
+    it('should be present when a client stream call fails', (done) => {
+      let count = 0;
+      const call = client.clientStream((err: ServiceError, data: any) => {
+        assert(err);
+
+        count++;
+        if (count === 2) {
+          done();
+        }
+      });
+
+      call.write({error: false});
+      call.write({error: true});
+      call.end();
+
+      call.on('status', (status: grpc.StatusObject) => {
+        assert.deepStrictEqual(status.metadata.get('trailer-present'), ['yes']);
+
+        count++;
+        if (count === 2) {
+          done();
+        }
+      });
+    });
+
     it('should be present when a server stream call succeeds', (done) => {
       const call = client.serverStream({error: false});
 
@@ -489,6 +573,19 @@ describe('Other conditions', () => {
       });
     });
 
+    it('for a client stream call', (done) => {
+      const call = client.clientStream((err: ServiceError, data: any) => {
+        assert(err);
+        assert.strictEqual(err.code, grpc.status.UNKNOWN);
+        assert.strictEqual(err.details, 'Requested error');
+        done();
+      });
+
+      call.write({error: false});
+      call.write({error: true});
+      call.end();
+    });
+
     it('for a server stream call', (done) => {
       const call = client.serverStream({error: true});
 

packages/grpc-js/test/test-server.ts

@@ -263,6 +263,16 @@ describe('Server', () => {
           });
     });
 
+    it('should respond to a client stream with UNIMPLEMENTED', (done) => {
+      const call = client.sum((error: ServiceError, response: any) => {
+        assert(error);
+        assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
+        done();
+      });
+
+      call.end();
+    });
+
     it('should respond to a server stream with UNIMPLEMENTED', (done) => {
       const call = client.fib({limit: 5});