Stub for WebRTCDeviceProvider

components/devtools_bridge/client/web_client.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 "components/devtools_bridge/client/web_client.h"
+
+#include <map>
+
+#include "base/bind.h"
+#include "base/memory/weak_ptr.h"
+#include "base/stl_util.h"
+#include "base/values.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_ui_message_handler.h"
 
 namespace devtools_bridge {
 
 namespace {
 
-class WebClientImpl : public WebClient, private content::WebContentsDelegate {
+class JSProxy : public content::WebUIMessageHandler {
  public:
-  WebClientImpl(content::BrowserContext* context, Delegate* delegate);
+  class Delegate {
+   public:
+     virtual void OnLoaded() = 0;
+     virtual void SendCommand(int request_id,
+                              const base::DictionaryValue* command) = 0;
+  };
+
+  explicit JSProxy(Delegate* delegate);
+
+  void RegisterMessages() override;
+
+  void StartSession(const std::string& device_id);
+  void StopSession(const std::string& device_id);
 
  private:
+  void HandleLoaded(const base::ListValue* args);
+  void HandleSendCommand(const base::ListValue* args);
+
   Delegate* const delegate_;
+};
+
+class ClientSession {
+};
+
+class WebClientImpl : public WebClient,
+                      private content::WebContentsDelegate,
+                      private JSProxy::Delegate,
+                      public base::SupportsWeakPtr<WebClientImpl> {
+ public:
+  WebClientImpl(content::BrowserContext* context,
+                WebClient::Delegate* delegate);
+  ~WebClientImpl();
+
+  // WebClient implementation.
+  void Connect(const std::string& device_id) override;
+  void Disconnect(const std::string& device_id) override;
+  void DisconnectAll() override;
+
+ private:
+  typedef std::map<std::string, ClientSession*> ClientSessionMap;
+
+  // JSProxy::Delegate
+  void OnLoaded() override;
+  void SendCommand(int request_id,
+                   const base::DictionaryValue* command) override;
+
+
+  void OnCommandSent(int request_id,
+                     scoped_ptr<const base::DictionaryValue> response);
+  void OnCommandFailed(int request_id);
+
+  ClientSessionMap client_session_map_;
+  WebClient::Delegate* const delegate_;
+  JSProxy js_proxy_;
   const scoped_ptr<content::WebContents> web_contents_;
+  bool is_loaded_;
 };
 
+// JSProxy implementation
+
+JSProxy::JSProxy(Delegate* delegate)
+    : delegate_(delegate) {
+}
+
+void JSProxy::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "loaded",
+      base::Bind(&JSProxy::HandleLoaded, base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      "sendCommand",
+      base::Bind(&JSProxy::HandleSendCommand, base::Unretained(this)));
+}
+
+void JSProxy::StartSession(const std::string& device_id) {
+  web_ui()->CallJavascriptFunction(
+      "WebClient.instance.startSession",
+      base::StringValue(device_id));
+}
+
+void JSProxy::StopSession(const std::string& device_id) {
+  web_ui()->CallJavascriptFunction(
+      "WebClient.instance.stopSession",
+      base::StringValue(device_id));
+}
+
+void JSProxy::HandleLoaded(const base::ListValue* args) {
+  delegate_->OnLoaded();
+}
+
+void JSProxy::HandleSendCommand(const base::ListValue* args) {
+  if (args->GetSize() != 2) {
+    DLOG(ERROR) << "Wrong number of arguments";
+    return;
+  }
+  int request_id;
+  if (!args->GetInteger(0, &request_id)) {
+    DLOG(ERROR) << "No request id";
+    return;
+  }
+  const base::DictionaryValue* command;
+  if (!args->GetDictionary(1, &command)) {
+    DLOG(ERROR) << "No message";
+    return;
+  }
+
+  delegate_->SendCommand(request_id, command);
+}
+
+// WebClientImpl implementation.
+
 WebClientImpl::WebClientImpl(content::BrowserContext* context,
-                             Delegate* delegate)
+                             WebClient::Delegate* delegate)
     : delegate_(delegate),
+      js_proxy_(this),
       web_contents_(content::WebContents::Create(
-          content::WebContents::CreateParams(context))) {
+          content::WebContents::CreateParams(context))),
+      is_loaded_(false) {
   web_contents_->SetDelegate(this);
+  GURL url("chrome-devtools://bridge/web_client.html");
+  web_contents_->GetController().LoadURL(url,
+                                         content::Referrer(),
+                                         ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
+                                         std::string());
+  web_contents_->GetWebUI()->AddMessageHandler(&js_proxy_);
+}
+
+WebClientImpl::~WebClientImpl() {
+  STLDeleteValues(&client_session_map_);
+}
+
+void WebClientImpl::Connect(const std::string& device_id) {
+  if (client_session_map_.find(device_id) != client_session_map_.end())
+    return;
+
+  if (is_loaded_)
+    js_proxy_.StartSession(device_id);
+
+  client_session_map_.insert(std::make_pair(device_id, new ClientSession()));
+}
+
+void WebClientImpl::Disconnect(const std::string& device_id) {
+  ClientSessionMap::iterator session = client_session_map_.find(device_id);
+  if (session == client_session_map_.end())
+    return;
+  if (is_loaded_)
+    js_proxy_.StartSession(device_id);
+
+  delete session->second;
+  client_session_map_.erase(session);
+}
+
+void WebClientImpl::DisconnectAll() {
+  if (is_loaded_) {
+    for (ClientSessionMap::iterator i = client_session_map_.begin();
+        i != client_session_map_.end(); ++i) {
+      js_proxy_.StopSession(i->first);
+    }
+  }
+  STLDeleteValues(&client_session_map_);
+  client_session_map_.clear();
+}
+
+void WebClientImpl::OnLoaded() {
+  DCHECK(!is_loaded_);
+  for (ClientSessionMap::iterator i = client_session_map_.begin();
+      i != client_session_map_.end(); ++i) {
+    js_proxy_.StartSession(i->first);
+  }
+}
+
+void WebClientImpl::SendCommand(int request_id,
+                                const base::DictionaryValue* command) {
+  delegate_->SendCommand(
+      command,
+      base::Bind(&WebClientImpl::OnCommandSent, AsWeakPtr(), request_id),
+      base::Bind(&WebClientImpl::OnCommandFailed, AsWeakPtr(), request_id));
+}
+
+void WebClientImpl::OnCommandSent(
+    int request_id,
+    scoped_ptr<const base::DictionaryValue> response) {
+  // TODO(serya): implement
+}
+
+void WebClientImpl::OnCommandFailed(int request_id) {
+  // TODO(serya): implement
 }
 
 }  // namespace
 
 scoped_ptr<WebClient> WebClient::CreateInstance(
     content::BrowserContext* context, Delegate* delegate) {
   return make_scoped_ptr(new WebClientImpl(context, delegate));
 }
 
 }  // namespace devtools_bridge