Mojo: Add a WebSocket/Client interface and hook it up to the HTML viewer.

mojo/services/html_viewer/websockethandle_impl.cc

+// Copyright 2014 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 "mojo/services/html_viewer/websockethandle_impl.h"
+
+#include <vector>
+
+#include "mojo/services/public/interfaces/network/network_service.mojom.h"
+#include "third_party/WebKit/public/platform/WebSerializedOrigin.h"
+#include "third_party/WebKit/public/platform/WebSocketHandleClient.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/platform/WebURL.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+
+using blink::WebSerializedOrigin;
+using blink::WebSocketHandle;
+using blink::WebSocketHandleClient;
+using blink::WebString;
+using blink::WebURL;
+using blink::WebVector;
+
+namespace mojo {
+
+template<>
+class TypeConverter<String, WebString> {
+ public:
+  static String ConvertFrom(const WebString& str) {
+    return String(str.utf8());
+  }
+  static WebString ConvertTo(const String& str) {
+    return WebString::fromUTF8(str.get());
+  }
+};
+
+template<typename T, typename U>
+class TypeConverter<Array<T>, WebVector<U> > {
+ public:
+  static Array<T> ConvertFrom(const WebVector<U>& vector) {
+    Array<T> array(vector.size());
+    for (size_t i = 0; i < vector.size(); ++i) {
+      array[i] = TypeConverter<T, U>::ConvertFrom(vector[i]);
+    }
+    return array.Pass();
+  }
+};
+
+template<>
+class TypeConverter<WebSocket::MessageType, WebSocketHandle::MessageType> {
+ public:
+  static WebSocket::MessageType ConvertFrom(WebSocketHandle::MessageType type) {
+    DCHECK(type == WebSocketHandle::MessageTypeContinuation ||
+           type == WebSocketHandle::MessageTypeText ||
+           type == WebSocketHandle::MessageTypeBinary);
+    typedef WebSocket::MessageType MessageType;
+    COMPILE_ASSERT(
+        static_cast<MessageType>(WebSocketHandle::MessageTypeContinuation) ==
+            WebSocket::MESSAGE_TYPE_CONTINUATION,
+        enum_values_must_match_for_message_type);
+    COMPILE_ASSERT(
+        static_cast<MessageType>(WebSocketHandle::MessageTypeText) ==
+            WebSocket::MESSAGE_TYPE_TEXT,
+        enum_values_must_match_for_message_type);
+    COMPILE_ASSERT(
+        static_cast<MessageType>(WebSocketHandle::MessageTypeBinary) ==
+            WebSocket::MESSAGE_TYPE_BINARY,
+        enum_values_must_match_for_message_type);
+    return static_cast<WebSocket::MessageType>(type);
+  }
+};
+
+template<>
+class TypeConverter<WebSocketHandle::MessageType, WebSocket::MessageType> {
+ public:
+  static WebSocketHandle::MessageType ConvertFrom(WebSocket::MessageType type) {
+    DCHECK(type == WebSocket::MESSAGE_TYPE_CONTINUATION ||
+           type == WebSocket::MESSAGE_TYPE_TEXT ||
+           type == WebSocket::MESSAGE_TYPE_BINARY);
+    return static_cast<WebSocketHandle::MessageType>(type);
+  }
+};
+
+// TODO(mpcomplete): remove this.
+template <typename T, typename U>
+inline T ConvertTo(const U& obj) {
+  return TypeConverter<T, U>::ConvertFrom(obj);
+}
+
+// This class forms a bridge from the mojo WebSocketClient interface and the
+// Blink WebSocketHandleClient interface.
+class WebSocketClientImpl : public InterfaceImpl<WebSocketClient> {
+ public:
+  explicit WebSocketClientImpl(WebSocketHandleImpl* handle,
+                               blink::WebSocketHandleClient* client)
+      : handle_(handle), client_(client) {}
+  virtual ~WebSocketClientImpl() {}
+
+ private:
+  // WebSocketClient methods:
+  virtual void DidConnect(
+      bool fail,
+      const String& selected_subprotocol,
+      const String& extensions) OVERRIDE {
+    client_->didConnect(handle_,
+                        fail,
+                        selected_subprotocol.To<WebString>(),
+                        extensions.To<WebString>());
+  }
+  virtual void DidReceiveData(bool fin,
+                              WebSocket::MessageType type,
+                              ScopedDataPipeConsumerHandle data_pipe) OVERRIDE {
+    uint32_t num_bytes;
+    ReadDataRaw(data_pipe.get(), NULL, &num_bytes, MOJO_READ_DATA_FLAG_QUERY);
+    std::vector<char> data(num_bytes);
+    ReadDataRaw(
+        data_pipe.get(), &data[0], &num_bytes, MOJO_READ_DATA_FLAG_NONE);
+    const char* data_ptr = data.empty() ? NULL : &data[0];
+    client_->didReceiveData(handle_,
+                            fin,
+                            ConvertTo<WebSocketHandle::MessageType>(type),
+                            data_ptr,
+                            data.size());
+  }
+
+  virtual void DidReceiveFlowControl(int64_t quota) OVERRIDE {
+    client_->didReceiveFlowControl(handle_, quota);
+    // |handle_| can be deleted here.
+  }
+
+  WebSocketHandleImpl* handle_;
+  blink::WebSocketHandleClient* client_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSocketClientImpl);
+};
+
+WebSocketHandleImpl::WebSocketHandleImpl(NetworkService* network_service)
+    : did_close_(false) {
+  network_service->CreateWebSocket(Get(&web_socket_));
+}
+
+WebSocketHandleImpl::~WebSocketHandleImpl() {
+  if (!did_close_) {
+    // The connection is abruptly disconnected by the renderer without
+    // closing handshake.
+    web_socket_->Close(WebSocket::kAbnormalCloseCode, String());
+  }
+}
+
+void WebSocketHandleImpl::connect(const WebURL& url,
+                                  const WebVector<WebString>& protocols,
+                                  const WebSerializedOrigin& origin,
+                                  WebSocketHandleClient* client) {
+  client_.reset(new WebSocketClientImpl(this, client));
+  WebSocketClientPtr client_ptr;
+  // TODO(mpcomplete): Is this the right ownership model? Or should mojo own
+  // |client_|?
+  WeakBindToProxy(client_.get(), &client_ptr);
+  web_socket_->Connect(url.string().utf8(),
+                       Array<String>::From(protocols),
+                       origin.string().utf8(),
+                       client_ptr.Pass());
+}
+
+void WebSocketHandleImpl::send(bool fin,
+                               WebSocketHandle::MessageType type,
+                               const char* data,
+                               size_t size) {
+  if (!client_)
+    return;
+
+  // TODO(mpcomplete): reuse the data pipe for subsequent sends.
+  uint32_t num_bytes = static_cast<uint32_t>(size);
+  MojoCreateDataPipeOptions options;
+  options.struct_size = sizeof(MojoCreateDataPipeOptions);
+  options.flags = MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE;
+  options.element_num_bytes = 1;
+  options.capacity_num_bytes = num_bytes;
+  DataPipe data_pipe(options);
+  WriteDataRaw(data_pipe.producer_handle.get(),
+               data,
+               &num_bytes,
+               MOJO_WRITE_DATA_FLAG_ALL_OR_NONE);
+  web_socket_->Send(
+      fin,
+      TypeConverter<WebSocket::MessageType,
+                    WebSocketHandle::MessageType>::ConvertFrom(type),
+      data_pipe.consumer_handle.Pass());
+}
+
+void WebSocketHandleImpl::flowControl(int64_t quota) {
+  if (!client_)
+    return;
+
+  web_socket_->FlowControl(quota);
+}
+
+void WebSocketHandleImpl::close(unsigned short code, const WebString& reason) {
+  did_close_ = true;
+  web_socket_->Close(code, reason.utf8());
+}
+
+}  // namespace mojo