Rename some WebUI Mojo concepts to be more generic

content/renderer/web_ui_mojo_context_state.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 "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::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);
-}
-
-}  // namespace
-
-// WebUIMojo -------------------------------------------------------------------
-
-WebUIMojoContextState::WebUIMojoContextState(blink::WebFrame* frame,
-                                             v8::Local<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