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// 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 "content/renderer/mojo_context_state.h"
#include <stddef.h>
#include <map>
#include <string>
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/memory/ref_counted.h"
#include "base/memory/ref_counted_memory.h"
#include "base/stl_util.h"
#include "content/grit/content_resources.h"
#include "content/public/common/content_client.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/resource_fetcher.h"
#include "content/renderer/mojo_main_runner.h"
#include "gin/converter.h"
#include "gin/modules/module_registry.h"
#include "gin/per_context_data.h"
#include "gin/public/context_holder.h"
#include "gin/try_catch.h"
#include "mojo/public/js/constants.h"
#include "third_party/WebKit/public/platform/WebSecurityOrigin.h"
#include "third_party/WebKit/public/platform/WebURLResponse.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
using v8::Context;
using v8::HandleScope;
using v8::Isolate;
using v8::Object;
using v8::ObjectTemplate;
using v8::Script;
namespace content {
namespace {
void RunMain(base::WeakPtr<gin::Runner> runner,
v8::Local<v8::Value> module) {
v8::Isolate* isolate = runner->GetContextHolder()->isolate();
v8::Local<v8::Function> start;
CHECK(gin::ConvertFromV8(isolate, module, &start));
runner->Call(start, runner->global(), 0, NULL);
}
using ModuleSourceMap =
std::map<std::string, scoped_refptr<base::RefCountedMemory>>;
base::LazyInstance<scoped_ptr<ModuleSourceMap>>::Leaky g_module_sources;
scoped_refptr<base::RefCountedMemory> GetBuiltinModuleData(
const std::string& path) {
static const struct {
const char* path;
const int id;
} kBuiltinModuleResources[] = {
{ mojo::kBindingsModuleName, IDR_MOJO_BINDINGS_JS },
{ mojo::kBufferModuleName, IDR_MOJO_BUFFER_JS },
{ mojo::kCodecModuleName, IDR_MOJO_CODEC_JS },
{ mojo::kConnectionModuleName, IDR_MOJO_CONNECTION_JS },
{ mojo::kConnectorModuleName, IDR_MOJO_CONNECTOR_JS },
{ mojo::kRouterModuleName, IDR_MOJO_ROUTER_JS },
{ mojo::kUnicodeModuleName, IDR_MOJO_UNICODE_JS },
{ mojo::kValidatorModuleName, IDR_MOJO_VALIDATOR_JS },
};
scoped_ptr<ModuleSourceMap>& module_sources = g_module_sources.Get();
if (!module_sources) {
// Initialize the module source map on first access.
module_sources.reset(new ModuleSourceMap);
for (size_t i = 0; i < arraysize(kBuiltinModuleResources); ++i) {
const auto& resource = kBuiltinModuleResources[i];
scoped_refptr<base::RefCountedMemory> data =
GetContentClient()->GetDataResourceBytes(resource.id);
DCHECK_GT(data->size(), 0u);
module_sources->insert(std::make_pair(std::string(resource.path), data));
}
}
DCHECK(module_sources);
auto source_iter = module_sources->find(path);
if (source_iter == module_sources->end())
return nullptr;
return source_iter->second;
}
} // namespace
MojoContextState::MojoContextState(blink::WebFrame* frame,
v8::Local<v8::Context> context,
bool for_layout_tests)
: frame_(frame),
module_added_(false),
module_prefix_(frame_->securityOrigin().toString().utf8() + "/") {
gin::PerContextData* context_data = gin::PerContextData::From(context);
gin::ContextHolder* context_holder = context_data->context_holder();
runner_.reset(new MojoMainRunner(frame_, context_holder));
gin::Runner::Scope scoper(runner_.get());
gin::ModuleRegistry::From(context)->AddObserver(this);
content::RenderFrame::FromWebFrame(frame)
->EnsureMojoBuiltinsAreAvailable(context_holder->isolate(), context);
v8::Local<v8::Object> install_target;
if (for_layout_tests) {
// In layout tests we install the module system under 'mojo.define'
// for now to avoid globally exposing something as generic as 'define'.
//
// TODO(rockot): Remove this if/when we can integrate gin + ES6 modules.
install_target = v8::Object::New(context->GetIsolate());
gin::SetProperty(context->GetIsolate(), context->Global(),
gin::StringToSymbol(context->GetIsolate(), "mojo"),
install_target);
} else {
// Otherwise we're fine installing a global 'define'.
install_target = context->Global();
}
gin::ModuleRegistry::InstallGlobals(context->GetIsolate(), install_target);
// Warning |frame| may be destroyed.
// TODO(sky): add test for this.
}
MojoContextState::~MojoContextState() {
gin::Runner::Scope scoper(runner_.get());
gin::ModuleRegistry::From(
runner_->GetContextHolder()->context())->RemoveObserver(this);
}
void MojoContextState::Run() {
gin::ContextHolder* context_holder = runner_->GetContextHolder();
gin::ModuleRegistry::From(context_holder->context())->LoadModule(
context_holder->isolate(),
"main",
base::Bind(RunMain, runner_->GetWeakPtr()));
}
void MojoContextState::FetchModules(const std::vector<std::string>& ids) {
gin::Runner::Scope scoper(runner_.get());
gin::ContextHolder* context_holder = runner_->GetContextHolder();
gin::ModuleRegistry* registry = gin::ModuleRegistry::From(
context_holder->context());
for (size_t i = 0; i < ids.size(); ++i) {
if (fetched_modules_.find(ids[i]) == fetched_modules_.end() &&
registry->available_modules().count(ids[i]) == 0) {
scoped_refptr<base::RefCountedMemory> data = GetBuiltinModuleData(ids[i]);
if (data)
runner_->Run(std::string(data->front_as<char>(), data->size()), ids[i]);
else
FetchModule(ids[i]);
}
}
}
void MojoContextState::FetchModule(const std::string& id) {
const GURL url(module_prefix_ + id);
// TODO(sky): better error checks here?
DCHECK(url.is_valid() && !url.is_empty());
DCHECK(fetched_modules_.find(id) == fetched_modules_.end());
fetched_modules_.insert(id);
ResourceFetcher* fetcher = ResourceFetcher::Create(url);
module_fetchers_.push_back(fetcher);
fetcher->Start(frame_,
blink::WebURLRequest::RequestContextScript,
blink::WebURLRequest::FrameTypeNone,
ResourceFetcher::PLATFORM_LOADER,
base::Bind(&MojoContextState::OnFetchModuleComplete,
base::Unretained(this), fetcher));
}
void MojoContextState::OnFetchModuleComplete(
ResourceFetcher* fetcher,
const blink::WebURLResponse& response,
const std::string& data) {
DCHECK_EQ(module_prefix_,
response.url().string().utf8().substr(0, module_prefix_.size()));
const std::string module =
response.url().string().utf8().substr(module_prefix_.size());
// We can't delete fetch right now as the arguments to this function come from
// it and are used below. Instead use a scope_ptr to cleanup.
scoped_ptr<ResourceFetcher> deleter(fetcher);
module_fetchers_.weak_erase(
std::find(module_fetchers_.begin(), module_fetchers_.end(), fetcher));
if (data.empty()) {
NOTREACHED();
return; // TODO(sky): log something?
}
runner_->Run(data, module);
}
void MojoContextState::OnDidAddPendingModule(
const std::string& id,
const std::vector<std::string>& dependencies) {
FetchModules(dependencies);
gin::ContextHolder* context_holder = runner_->GetContextHolder();
gin::ModuleRegistry* registry = gin::ModuleRegistry::From(
context_holder->context());
registry->AttemptToLoadMoreModules(context_holder->isolate());
}
} // namespace content
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