content/renderer/web_ui_mojo_context_state.h

   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
  16 namespace blink {
  17 class WebFrame;
  18 class WebURLResponse;
  19 }
  20
  21 namespace gin {
  22 class ContextHolder;
  23 struct PendingModule;
  24 }
  25
  26 namespace content {
  27
  28 class ResourceFetcher;
  29 class 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.
  34 class WebUIMojoContextState : public gin::ModuleRegistryObserver {
  35  public:
  36   WebUIMojoContextState(blink::WebFrame* frame,
  37                         v8::Handle<v8::Context> context);
  38   ~WebUIMojoContextState() override;
  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   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_