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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/web_ui_mojo_context_state.h"
#include "base/bind.h"
#include "base/stl_util.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/resource_fetcher.h"
#include "content/renderer/web_ui_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 "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 {
// All modules have this prefixed to them when downloading.
// TODO(sky): move this into some common place.
const char kModulePrefix[] = "chrome://mojo/";
void RunMain(base::WeakPtr<gin::Runner> runner,
v8::Handle<v8::Value> module) {
v8::Isolate* isolate = runner->GetContextHolder()->isolate();
v8::Handle<v8::Function> start;
CHECK(gin::ConvertFromV8(isolate, module, &start));
runner->Call(start, runner->global(), 0, NULL);
}
} // namespace
// WebUIMojo -------------------------------------------------------------------
WebUIMojoContextState::WebUIMojoContextState(blink::WebFrame* frame,
v8::Handle<v8::Context> context)
: frame_(frame),
module_added_(false) {
gin::PerContextData* context_data = gin::PerContextData::From(context);
gin::ContextHolder* context_holder = context_data->context_holder();
runner_.reset(new WebUIRunner(frame_, context_holder));
gin::Runner::Scope scoper(runner_.get());
gin::ModuleRegistry::From(context)->AddObserver(this);
content::RenderFrame::FromWebFrame(frame)
->EnsureMojoBuiltinsAreAvailable(context_holder->isolate(), context);
gin::ModuleRegistry::InstallGlobals(context->GetIsolate(), context->Global());
// Warning |frame| may be destroyed.
// TODO(sky): add test for this.
}
WebUIMojoContextState::~WebUIMojoContextState() {
gin::Runner::Scope scoper(runner_.get());
gin::ModuleRegistry::From(
runner_->GetContextHolder()->context())->RemoveObserver(this);
}
void WebUIMojoContextState::Run() {
gin::ContextHolder* context_holder = runner_->GetContextHolder();
gin::ModuleRegistry::From(context_holder->context())->LoadModule(
context_holder->isolate(),
"main",
base::Bind(RunMain, runner_->GetWeakPtr()));
}
void WebUIMojoContextState::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) {
FetchModule(ids[i]);
}
}
}
void WebUIMojoContextState::FetchModule(const std::string& id) {
const GURL url(kModulePrefix + 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(&WebUIMojoContextState::OnFetchModuleComplete,
base::Unretained(this),
fetcher));
}
void WebUIMojoContextState::OnFetchModuleComplete(
ResourceFetcher* fetcher,
const blink::WebURLResponse& response,
const std::string& data) {
DCHECK_EQ(kModulePrefix,
response.url().string().utf8().substr(0, arraysize(kModulePrefix) - 1));
const std::string module =
response.url().string().utf8().substr(arraysize(kModulePrefix) - 1);
// 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 WebUIMojoContextState::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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