[Presentation API] (4th)(1-UA blink side) Add WebPresentationConnection and WebPresentationConnecti…

content/renderer/presentation/presentation_connection_proxy.cc

+// Copyright 2017 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.
+
+#include "content/renderer/presentation/presentation_connection_proxy.h"
+
+#include "base/logging.h"
+#include "content/renderer/presentation/presentation_dispatcher.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationConnection.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationController.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationSessionInfo.h"
+
+namespace content {
+
+PresentationConnectionProxy::PresentationConnectionProxy(
+    blink::WebPresentationConnection* source_connection)
+    : binding_(this),
+      target_connection_ptr_(nullptr),
+      source_connection_(source_connection) {
+  DCHECK(source_connection_);
+}
+
+PresentationConnectionProxy::~PresentationConnectionProxy() = default;
+
+void PresentationConnectionProxy::SendConnectionMessage(
+    blink::mojom::ConnectionMessagePtr connection_message,
+    const OnMessageCallback& callback) const {
+  DCHECK(target_connection_ptr_);
+  target_connection_ptr_->OnMessage(std::move(connection_message), callback);
+}
+
+void PresentationConnectionProxy::OnMessage(
+    blink::mojom::ConnectionMessagePtr message,
+    const OnMessageCallback& callback) {
+  DCHECK(!callback.is_null());
+
+  switch (message->type) {
+    case blink::mojom::PresentationMessageType::TEXT: {
+      DCHECK(message->message);
+      source_connection_->didReceiveTextMessage(
+          blink::WebString::fromUTF8(message->message.value()));
+      break;
+    }
+    case blink::mojom::PresentationMessageType::BINARY: {
+      DCHECK(message->data);
+      source_connection_->didReceiveBinaryMessage(&(message->data->front()),
+                                                  message->data->size());
+      break;
+    }
+    default: {
+      callback.Run(false);
+      NOTREACHED();
+      break;

[mlamouri (slow - plz ping), 2017/01/26 22:18:02]

nit: it's a NOTREACHED() but you might want to return instead of `break` because
otherwise, you will call `callback.Run()` twice and that might not work very
well :)

[zhaobin, 2017/01/26 22:48:14]

Done.

+    }
+  }
+
+  callback.Run(true);
+}
+
+// TODO(crbug.com/588874): Ensure legal PresentationConnection state transitions
+// in a single place.
+void PresentationConnectionProxy::DidChangeState(
+    blink::mojom::PresentationConnectionState state) {
+  if (state == blink::mojom::PresentationConnectionState::CONNECTED) {

[mlamouri (slow - plz ping), 2017/01/26 22:18:02]

nit:
```
if (state != blink::mojom:...::CONNECTED) {
  NOTREACHED();
  return;
}

// real stuff
```

[zhaobin, 2017/01/26 22:48:14]

Done.

+    source_connection_->didChangeState(
+        blink::WebPresentationConnectionState::Connected);
+  } else {
+    // |DidChangeState| should only handle state transition from connecting ->
+    // connected. PresentationService and MRP handles other state transitions.
+    NOTREACHED();
+  }
+}
+
+ControllerConnectionProxy::ControllerConnectionProxy(
+    blink::WebPresentationConnection* controller_connection)
+    : PresentationConnectionProxy(controller_connection) {}
+
+ControllerConnectionProxy::~ControllerConnectionProxy() {}

[mlamouri (slow - plz ping), 2017/01/26 22:18:02]

= default;

[zhaobin, 2017/01/26 22:48:14]

Done.

+
+blink::mojom::PresentationConnectionPtr ControllerConnectionProxy::Bind() {
+  return binding_.CreateInterfacePtrAndBind();
+}
+
+blink::mojom::PresentationConnectionRequest
+ControllerConnectionProxy::MakeRemoteRequest() {
+  DCHECK(!target_connection_ptr_)
+      << "target_connection_ptr_ should only be bound once.";
+  return mojo::MakeRequest(&target_connection_ptr_);
+}
+
+ReceiverConnectionProxy::ReceiverConnectionProxy(
+    blink::WebPresentationConnection* receiver_connection)
+    : PresentationConnectionProxy(receiver_connection) {}
+
+ReceiverConnectionProxy::~ReceiverConnectionProxy() {}

[mlamouri (slow - plz ping), 2017/01/26 22:18:02]

ditto

[zhaobin, 2017/01/26 22:48:14]

Done.

+
+void ReceiverConnectionProxy::Bind(
+    blink::mojom::PresentationConnectionRequest receiver_connection_request) {
+  binding_.Bind(std::move(receiver_connection_request));
+}
+
+void ReceiverConnectionProxy::BindControllerConnection(
+    blink::mojom::PresentationConnectionPtr controller_connection_ptr) {
+  DCHECK(!target_connection_ptr_);
+  target_connection_ptr_ = std::move(controller_connection_ptr);
+  target_connection_ptr_->DidChangeState(
+      blink::mojom::PresentationConnectionState::CONNECTED);
+
+  DidChangeState(blink::mojom::PresentationConnectionState::CONNECTED);
+}
+
+}  // namespace content