GRPC Stream implementation of HeliumStream

blimp/net/grpc_connection.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BLIMP_NET_GRPC_CONNECTION_H_
+#define BLIMP_NET_GRPC_CONNECTION_H_
+
+#include <memory>
+
+#include "base/macros.h"
+
+#include "blimp/net/blimp_connection.h"
+#include "blimp/net/blimp_net_export.h"
+
+namespace blimp {
+
+class BlimpMessage;
+class BlimpMessageProcessor;
+class GrpcIncomingForwarder;
+class GrpcOutgoingForwarder;
+class GrpcStream;
+
+// TODO(perumaal): Remove this class after Helium transport layer is setup.
+// A |BlimpConnection| that wraps around a |GrpcClientStream| or a
+// |GrpcEngineStream| converting |HeliumMessage| to/from |BlimpMessage|. This is
+// an interim solution until we have the full Helium protocol in place. It still
+// uses the actual |HeliumStream| interfaces to talk to the gRPC layer so the
+// actual code in those gRPC-related classes will outlive this class.
+class BLIMP_NET_EXPORT GrpcConnection : public BlimpConnection {
+ public:
+  explicit GrpcConnection(std::unique_ptr<GrpcStream> stream_delegate);
+  BlimpMessageProcessor* GetOutgoingMessageProcessor() override;
+  void SetIncomingMessageProcessor(BlimpMessageProcessor* processor) override;
+  ~GrpcConnection() override;
+
+ private:
+  std::unique_ptr<GrpcStream> stream_;
+
+  // Forwarders that convert from |BlimpMessage|s to |HeliumMessage|s (and vice
+  // versa).
+  std::unique_ptr<GrpcOutgoingForwarder> outgoing_forwarder_;
+  std::unique_ptr<GrpcIncomingForwarder> incoming_forwarder_;
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_NET_GRPC_CONNECTION_H_