Migrate DevToolsWindow from specific to opaque frontend host messages

chrome/browser/devtools/devtools_embedder_message_dispatcher.cc

+// Copyright (c) 2013 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 "chrome/browser/devtools/devtools_embedder_message_dispatcher.h"
+
+#include "base/bind.h"
+#include "base/json/json_reader.h"
+#include "base/values.h"
+
+namespace {
+
+static const char kFrontendHostMethod[] = "method";
+static const char kFrontendHostParams[] = "params";
+
+bool GetValue(const base::ListValue& list, int pos, std::string& value) {
+  return list.GetString(pos, &value);
+}
+
+bool GetValue(const base::ListValue& list, int pos, int& value) {
+  return list.GetInteger(pos, &value);
+}
+
+bool GetValue(const base::ListValue& list, int pos, bool& value) {
+  return list.GetBoolean(pos, &value);
+}
+
+template <typename T>
+struct StorageTraits {
+  typedef T StorageType;
+};
+
+template <typename T>
+struct StorageTraits<const T&> {
+  typedef T StorageType;
+};
+
+template <class A>
+class Argument {
+ public:
+  typedef typename StorageTraits<A>::StorageType ValueType;
+
+  Argument(const base::ListValue& list, int pos) {
+    valid_ = GetValue(list, pos, value_);
+  }
+
+  ValueType value() const { return value_; }
+  bool valid() const { return valid_; }
+
+ private:
+  ValueType value_;
+  bool valid_;
+};
+
+bool ParseAndHandle0(const base::Callback<void(void)>& handler,
+                     const base::ListValue& list) {
+  handler.Run();
+  return true;
+}
+
+template <class A1>
+bool ParseAndHandle1(const base::Callback<void(A1)>& handler,
+                     const base::ListValue& list) {
+  if (list.GetSize() != 1)
+    return false;
+  Argument<A1> arg1(list, 0);
+  if (!arg1.valid())
+    return false;
+  handler.Run(arg1.value());
+  return true;
+}
+
+template <class A1, class A2>
+bool ParseAndHandle2(const base::Callback<void(A1, A2)>& handler,
+                     const base::ListValue& list) {
+  if (list.GetSize() != 2)
+    return false;
+  Argument<A1> arg1(list, 0);
+  if (!arg1.valid())
+    return false;
+  Argument<A2> arg2(list, 1);
+  if (!arg2.valid())
+    return false;
+  handler.Run(arg1.value(), arg2.value());
+  return true;
+}
+
+template <class A1, class A2, class A3>
+bool ParseAndHandle3(const base::Callback<void(A1, A2, A3)>& handler,
+                     const base::ListValue& list) {
+  if (list.GetSize() != 3)
+    return false;
+  Argument<A1> arg1(list, 0);
+  if (!arg1.valid())
+    return false;
+  Argument<A2> arg2(list, 1);
+  if (!arg2.valid())
+    return false;
+  Argument<A3> arg3(list, 2);
+  if (!arg3.valid())
+    return false;
+  handler.Run(arg1.value(), arg2.value(), arg3.value());
+  return true;
+}
+
+typedef base::Callback<bool(const base::ListValue&)> ListValueParser;
+
+ListValueParser BindToListParser(const base::Callback<void()>& handler) {
+  return base::Bind(&ParseAndHandle0, handler);
+}
+
+template <class A1>
+ListValueParser BindToListParser(const base::Callback<void(A1)>& handler) {
+  return base::Bind(&ParseAndHandle1<A1>, handler);
+}
+
+template <class A1, class A2>
+ListValueParser BindToListParser(const base::Callback<void(A1,A2)>& handler) {
+  return base::Bind(&ParseAndHandle2<A1, A2>, handler);
+}
+
+template <class A1, class A2, class A3>
+ListValueParser BindToListParser(
+    const base::Callback<void(A1,A2,A3)>& handler) {
+  return base::Bind(&ParseAndHandle3<A1, A2, A3>, handler);
+}
+
+}  // namespace
+
+DevToolsEmbedderMessageDispatcher::DevToolsEmbedderMessageDispatcher(
+    Delegate* delegate) {
+  RegisterHandler("bringToFront",
+      BindToListParser(base::Bind(&Delegate::ActivateWindow,
+                                  base::Unretained(delegate))));
+  RegisterHandler("closeWindow",
+      BindToListParser(base::Bind(&Delegate::CloseWindow,
+                                  base::Unretained(delegate))));
+  RegisterHandler("moveWindowBy",
+      BindToListParser(base::Bind(&Delegate::MoveWindow,
+                                  base::Unretained(delegate))));
+  RegisterHandler("requestSetDockSide",
+      BindToListParser(base::Bind(&Delegate::SetDockSide,
+                                  base::Unretained(delegate))));
+  RegisterHandler("openInNewTab",
+      BindToListParser(base::Bind(&Delegate::OpenInNewTab,
+                                  base::Unretained(delegate))));
+  RegisterHandler("save",
+      BindToListParser(base::Bind(&Delegate::SaveToFile,
+                                  base::Unretained(delegate))));
+  RegisterHandler("append",
+      BindToListParser(base::Bind(&Delegate::AppendToFile,
+                                  base::Unretained(delegate))));
+  RegisterHandler("requestFileSystems",
+      BindToListParser(base::Bind(&Delegate::RequestFileSystems,
+                                  base::Unretained(delegate))));
+  RegisterHandler("addFileSystem",
+      BindToListParser(base::Bind(&Delegate::AddFileSystem,
+                                  base::Unretained(delegate))));
+  RegisterHandler("removeFileSystem",
+      BindToListParser(base::Bind(&Delegate::RemoveFileSystem,
+                                  base::Unretained(delegate))));
+  RegisterHandler("indexPath",
+      BindToListParser(base::Bind(&Delegate::IndexPath,
+                                  base::Unretained(delegate))));
+  RegisterHandler("stopIndexing",
+      BindToListParser(base::Bind(&Delegate::StopIndexing,
+                                  base::Unretained(delegate))));
+  RegisterHandler("searchInPath",
+      BindToListParser(base::Bind(&Delegate::SearchInPath,
+                                  base::Unretained(delegate))));
+}
+
+DevToolsEmbedderMessageDispatcher::~DevToolsEmbedderMessageDispatcher() {}
+
+void DevToolsEmbedderMessageDispatcher::Dispatch(const std::string& message) {
+  std::string method;
+  base::ListValue empty_params;
+  base::ListValue* params = &empty_params;
+
+  base::DictionaryValue* dict;
+  scoped_ptr<base::Value> parsed_message(base::JSONReader::Read(message));
+  if (!parsed_message ||
+      !parsed_message->GetAsDictionary(&dict) ||
+      !dict->GetString(kFrontendHostMethod, &method) ||
+      (dict->HasKey(kFrontendHostParams) &&
+          !dict->GetList(kFrontendHostParams, &params))) {
+    LOG(ERROR) << "Cannot parse frontend host message: " << message;
+    return;
+  }
+
+  HandlerMap::iterator it = handlers_.find(method);
+  if (it == handlers_.end()) {
+    LOG(ERROR) << "Unsupported frontend host method: " << message;
+    return;
+  }
+
+  if (!it->second.Run(*params))
+    LOG(ERROR) << "Invalid frontend host message parameters: " << message;
+}
+
+void DevToolsEmbedderMessageDispatcher::RegisterHandler(
+    const std::string& method, const Handler& handler) {
+  handlers_[method] = handler;
+}