Blob support for IDB [Chromium]

content/browser/indexed_db/indexed_db_backing_store.h

Index: content/browser/indexed_db/indexed_db_backing_store.h
diff --git a/content/browser/indexed_db/indexed_db_backing_store.h b/content/browser/indexed_db/indexed_db_backing_store.h
index d56619e68ee96cdc3283e390dccebe9eb4b15599..95656a93c939770e2cef0aceab3d40be6b5301a7 100644
--- a/content/browser/indexed_db/indexed_db_backing_store.h
+++ b/content/browser/indexed_db/indexed_db_backing_store.h
@@ -203,6 +203,11 @@ class CONTENT_EXPORT IndexedDBBackingStore
       int64 database_id,
       int64 object_store_id,
       const RecordIdentifier& record) WARN_UNUSED_RESULT;
+  virtual leveldb::Status DeleteRange(
+      IndexedDBBackingStore::Transaction* transaction,
+      int64 database_id,
+      int64 object_store_id,
+      const IndexedDBKeyRange&) WARN_UNUSED_RESULT;
   virtual leveldb::Status GetKeyGeneratorCurrentNumber(
       IndexedDBBackingStore::Transaction* transaction,
       int64 database_id,
@@ -264,6 +269,8 @@ class CONTENT_EXPORT IndexedDBBackingStore
 
   base::FilePath GetBlobFileName(int64 database_id, int64 key);
 
+  class Transaction;
+
   class Cursor {
    public:
     virtual ~Cursor();
@@ -308,7 +315,9 @@ class CONTENT_EXPORT IndexedDBBackingStore
     virtual bool LoadCurrentRow() = 0;
 
    protected:
-    Cursor(LevelDBTransaction* transaction,
+    Cursor(scoped_refptr<IndexedDBBackingStore> backing_store,
+           Transaction* transaction,
+           int64 database_id,
            const CursorOptions& cursor_options);
     explicit Cursor(const IndexedDBBackingStore::Cursor* other);
 
@@ -319,7 +328,9 @@ class CONTENT_EXPORT IndexedDBBackingStore
     bool IsPastBounds() const;
     bool HaveEnteredRange() const;
 
-    LevelDBTransaction* transaction_;
+    IndexedDBBackingStore* backing_store_;
+    Transaction* transaction_;
+    int64 database_id_;
     const CursorOptions cursor_options_;
     scoped_ptr<LevelDBIterator> iterator_;
     scoped_ptr<IndexedDBKey> current_key_;
@@ -385,7 +396,10 @@ class CONTENT_EXPORT IndexedDBBackingStore
     explicit Transaction(IndexedDBBackingStore* backing_store);
     virtual ~Transaction();
     virtual void Begin();
-    virtual leveldb::Status Commit();
+    // The callback will be called eventually on success or failure, or
+    // immediately if phase one is complete due to lack of any blobs to write.
+    virtual leveldb::Status CommitPhaseOne(scoped_refptr<BlobWriteCallback>);
+    virtual leveldb::Status CommitPhaseTwo();
     virtual void Rollback();
     void Reset() {
       backing_store_ = NULL;
@@ -399,6 +413,11 @@ class CONTENT_EXPORT IndexedDBBackingStore
 
     LevelDBTransaction* transaction() { return transaction_; }
 
+    leveldb::Status GetBlobInfoForRecord(
+        int64 database_id,
+        const std::string& object_store_data_key,
+        IndexedDBValue* value);
+
     // This holds a BlobEntryKey and the encoded IndexedDBBlobInfo vector stored
     // under that key.
     typedef std::vector<std::pair<BlobEntryKey, std::string> >
@@ -449,16 +468,23 @@ class CONTENT_EXPORT IndexedDBBackingStore
    private:
     class BlobWriteCallbackWrapper;
 
+    // These return true on success, false on failure.
+    leveldb::Status HandleBlobPreTransaction(
+        BlobEntryKeyValuePairVec* new_blob_entries,
+        WriteDescriptorVec* new_files_to_write);
+    bool CollectBlobFilesToRemove();
     // The callback will be called eventually on success or failure.
     void WriteNewBlobs(BlobEntryKeyValuePairVec& new_blob_entries,
                        WriteDescriptorVec& new_files_to_write,
                        scoped_refptr<BlobWriteCallback> callback);
+    leveldb::Status SortBlobsToRemove();
 
     IndexedDBBackingStore* backing_store_;
     scoped_refptr<LevelDBTransaction> transaction_;
     BlobChangeMap blob_change_map_;
     BlobChangeMap incognito_blob_map_;
     int64 database_id_;
+    BlobJournalType blobs_to_remove_;
     scoped_refptr<ChainedBlobWriter> chained_blob_writer_;
   };
 
@@ -475,6 +501,8 @@ class CONTENT_EXPORT IndexedDBBackingStore
 
   bool is_incognito() const { return !indexed_db_factory_; }
 
+  bool SetUpMetadata();
+
   virtual bool WriteBlobFile(
       int64 database_id,
       const Transaction::WriteDescriptor& descriptor,