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// Copyright (c) 2009 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/extensions/extension_function_dispatcher.h"
#include "base/json_reader.h"
#include "base/json_writer.h"
#include "base/singleton.h"
#include "base/values.h"
#include "chrome/browser/extensions/extension_function.h"
#include "chrome/browser/extensions/extension_tabs_module.h"
#include "chrome/browser/renderer_host/render_view_host.h"
// FactoryRegistry -------------------------------------------------------------
namespace {
// A pointer to a function that create an instance of an ExtensionFunction.
typedef ExtensionFunction* (*ExtensionFunctionFactory)();
// Contains a list of all known extension functions and allows clients to create
// instances of them.
class FactoryRegistry {
public:
static FactoryRegistry* instance();
FactoryRegistry();
void GetAllNames(std::vector<std::string>* names);
ExtensionFunction* NewFunction(const std::string& name);
private:
typedef std::map<std::string, ExtensionFunctionFactory> FactoryMap;
FactoryMap factories_;
};
// Template for defining ExtensionFunctionFactory.
template<class T>
ExtensionFunction* NewExtensionFunction() {
return new T();
}
FactoryRegistry* FactoryRegistry::instance() {
return Singleton<FactoryRegistry>::get();
}
FactoryRegistry::FactoryRegistry() {
// Register all functions here.
factories_["GetTabsForWindow"] =
&NewExtensionFunction<GetTabsForWindowFunction>;
factories_["CreateTab"] = &NewExtensionFunction<CreateTabFunction>;
}
void FactoryRegistry::GetAllNames(
std::vector<std::string>* names) {
for (FactoryMap::iterator iter = factories_.begin(); iter != factories_.end();
++iter) {
names->push_back(iter->first);
}
}
ExtensionFunction* FactoryRegistry::NewFunction(const std::string& name) {
FactoryMap::iterator iter = factories_.find(name);
DCHECK(iter != factories_.end());
return iter->second();
}
};
// ExtensionFunctionDispatcher -------------------------------------------------
void ExtensionFunctionDispatcher::GetAllFunctionNames(
std::vector<std::string>* names) {
FactoryRegistry::instance()->GetAllNames(names);
}
ExtensionFunctionDispatcher::ExtensionFunctionDispatcher(
RenderViewHost* render_view_host)
: render_view_host_(render_view_host) {}
void ExtensionFunctionDispatcher::HandleRequest(const std::string& name,
const std::string& args,
int callback_id) {
scoped_ptr<Value> value;
if (!args.empty()) {
JSONReader reader;
value.reset(reader.JsonToValue(args, false, false));
// Since we do the serialization in the v8 extension, we should always get
// valid JSON.
if (!value.get()) {
DCHECK(false);
return;
}
}
// TODO(aa): This will get a bit more complicated when we support functions
// that live longer than the stack frame.
scoped_ptr<ExtensionFunction> function(
FactoryRegistry::instance()->NewFunction(name));
function->set_dispatcher(this);
function->set_args(value.get());
function->set_callback_id(callback_id);
function->Run();
}
void ExtensionFunctionDispatcher::SendResponse(ExtensionFunction* function) {
std::string json;
// Some functions might not need to return any results.
if (function->result())
JSONWriter::Write(function->result(), false, &json);
render_view_host_->SendExtensionResponse(function->callback_id(), json);
}
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