1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
6#define CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
7
8#include <set>
9#include <string>
10
11#include "base/memory/scoped_ptr.h"
12#include "base/memory/scoped_vector.h"
13#include "gin/modules/module_registry_observer.h"
14#include "v8/include/v8.h"
15
16namespace blink {
17class WebFrame;
18class WebURLResponse;
19}
20
21namespace gin {
22class ContextHolder;
23struct PendingModule;
24}
25
26namespace content {
27
28class ResourceFetcher;
29class WebUIRunner;
30
31// WebUIMojoContextState manages the modules needed for mojo bindings. It does
32// this by way of gin. Non-builtin modules are downloaded by way of
33// ResourceFetchers.
34class WebUIMojoContextState : public gin::ModuleRegistryObserver {
35 public:
36  WebUIMojoContextState(blink::WebFrame* frame,
37                        v8::Handle<v8::Context> context);
38  virtual ~WebUIMojoContextState();
39
40  void Run();
41
42  // Returns true if at least one module was added.
43  bool module_added() const { return module_added_; }
44
45 private:
46  class Loader;
47
48  // Invokes FetchModule() for any modules that have not already been
49  // downloaded.
50  void FetchModules(const std::vector<std::string>& ids);
51
52  // Creates a ResourceFetcher to download |module|.
53  void FetchModule(const std::string& module);
54
55  // Callback once a module has finished downloading. Passes data to |runner_|.
56  void OnFetchModuleComplete(ResourceFetcher* fetcher,
57                             const blink::WebURLResponse& response,
58                             const std::string& data);
59
60  // gin::ModuleRegistryObserver overrides:
61  virtual void OnDidAddPendingModule(
62      const std::string& id,
63      const std::vector<std::string>& dependencies) OVERRIDE;
64
65  // Frame script is executed in. Also used to download resources.
66  blink::WebFrame* frame_;
67
68  // See description above getter.
69  bool module_added_;
70
71  // Executes the script from gin.
72  scoped_ptr<WebUIRunner> runner_;
73
74  // Set of fetchers we're waiting on to download script.
75  ScopedVector<ResourceFetcher> module_fetchers_;
76
77  // Set of modules we've fetched script from.
78  std::set<std::string> fetched_modules_;
79
80  DISALLOW_COPY_AND_ASSIGN(WebUIMojoContextState);
81};
82
83}  // namespace content
84
85#endif  // CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
86