Media Galleries API Picasa: Put INI indexing step into sandboxed utility process.

chrome/browser/media_galleries/fileapi/safe_picasa_albums_indexer.h

 // Copyright 2013 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.
 
-#ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUM_TABLE_READER_H_
-#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUM_TABLE_READER_H_
+#ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUMS_INDEXER_H_
+#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUMS_INDEXER_H_
 
-#include <string>
+#include <queue>
+#include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/common/media_galleries/picasa_types.h"
-#include "content/public/browser/utility_process_host.h"
 #include "content/public/browser/utility_process_host_client.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace IPC {
 class Message;
 }
 
 namespace picasa {
 
-// SafePicasaAlbumTableReader parses the given Picasa PMP Album Table safely
-// via a utility process. The SafePicasaAlbumTableReader object is ref-counted
+// SafePicasaAlbumsIndexer indexes the contents of Picasa Albums by parsing the
+// INI files found in Folders. The SafePicasaAlbumsIndexer object is ref-counted
 // and kept alive after Start() is called until the ParserCallback is called.
 // The ParserCallback is guaranteed to be called eventually either when the
 // utility process replies or when it dies.
-class SafePicasaAlbumTableReader : public content::UtilityProcessHostClient {
+class SafePicasaAlbumsIndexer : public content::UtilityProcessHostClient {
  public:
-  typedef base::Callback<void(bool,
-                              const std::vector<AlbumInfo>&,
-                              const std::vector<AlbumInfo>&)> ParserCallback;
+  typedef base::Callback<void(bool /* success */,
+                              const picasa::AlbumImagesMap&)> DoneCallback;
 
-  SafePicasaAlbumTableReader(const AlbumTableFiles& album_table_files,
-                             const ParserCallback& callback);
+  SafePicasaAlbumsIndexer(const AlbumMap& albums,
+                          const AlbumMap& folders,
+                          const DoneCallback& callback);
 
   void Start();
 
  private:
   enum ParserState {
     INITIAL_STATE,
-    PINGED_UTILITY_PROCESS_STATE,
     STARTED_PARSING_STATE,
     FINISHED_PARSING_STATE,
   };
 
   // Private because content::UtilityProcessHostClient is ref-counted.
-  virtual ~SafePicasaAlbumTableReader();
+  virtual ~SafePicasaAlbumsIndexer();
+
+  // Processes a batch of folders. Reposts itself until done, then starts IPC.
+  void ProcessFoldersBatch();
 
   // Launches the utility process.  Must run on the IO thread.
   void StartWorkOnIOThread();
 
-  // Notification that the utility process is running, and we can now get its
-  // process handle.
+  // Notification from the utility process when it finshes indexing all the
+  // album contents. On error will return an empty map.
   // Runs on the IO thread.
-  void OnProcessStarted();
-
-  // Notification from the utility process when it finshes parsing the PMP
-  // database. This is received even if PMP parsing fails.
-  // Runs on the IO thread.
-  void OnParsePicasaPMPDatabaseFinished(bool parse_success,
-                                        const std::vector<AlbumInfo>& albums,
-                                        const std::vector<AlbumInfo>& folders);
+  void OnIndexPicasaAlbumsContentsFinished(const AlbumImagesMap& albums_images);
 
   // UtilityProcessHostClient implementation.
   // Runs on the IO thread.
   virtual void OnProcessCrashed(int exit_code) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
-  const AlbumTableFiles album_table_files_;
+  AlbumUIDSet album_uids_;
 
-  // Only accessed on the IO thread.
-  base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
+  // List of folders that still need their INI files read.
+  std::queue<base::FilePath> folders_queue_;
+
+  std::vector<picasa::FolderINIContents> folders_inis_;
 
   // Only accessed on the Media Task Runner.
-  const ParserCallback callback_;
+  const DoneCallback callback_;
 
   // Verifies the messages from the utility process came at the right time.
   // Initialized on the Media Task Runner, but only accessed on the IO thread.
   ParserState parser_state_;
 
-  DISALLOW_COPY_AND_ASSIGN(SafePicasaAlbumTableReader);
+  DISALLOW_COPY_AND_ASSIGN(SafePicasaAlbumsIndexer);
 };
 
 }  // namespace picasa
 
-#endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUM_TABLE_READER_H_
+#endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_PICASA_ALBUMS_INDEXER_H_