[IndexedDB] Closing mojo connections when renderer quits

content/browser/indexed_db/indexed_db_dispatcher_host.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DISPATCHER_HOST_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/common/indexed_db/indexed_db.mojom.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_process_host_observer.h"
 #include "mojo/public/cpp/bindings/associated_binding_set.h"
+#include "mojo/public/cpp/bindings/strong_associated_binding_set.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "storage/browser/blob/blob_data_handle.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace url {
 class Origin;
 }
 
 namespace content {
 class IndexedDBBlobInfo;
-class IndexedDBCallbacks;
 class IndexedDBContextImpl;
-class IndexedDBDatabaseCallbacks;
 
 // Handles all IndexedDB related messages from a particular renderer process.
-class IndexedDBDispatcherHost
-    : public base::RefCountedThreadSafe<IndexedDBDispatcherHost,
-                                        BrowserThread::DeleteOnIOThread>,
-      public ::indexed_db::mojom::Factory {
+// Constructed on UI thread, expects all other calls (including destruction) on
+// IO thread.
+class CONTENT_EXPORT IndexedDBDispatcherHost
+    : public ::indexed_db::mojom::Factory,
+      public RenderProcessHostObserver {
  public:
   // Only call the constructor from the UI thread.
-  IndexedDBDispatcherHost(int ipc_process_id,
-                          net::URLRequestContextGetter* request_context_getter,
-                          IndexedDBContextImpl* indexed_db_context,
-                          ChromeBlobStorageContext* blob_storage_context);
+  IndexedDBDispatcherHost(
+      int ipc_process_id,
+      scoped_refptr<net::URLRequestContextGetter> request_context_getter,
+      scoped_refptr<IndexedDBContextImpl> indexed_db_context,
+      scoped_refptr<ChromeBlobStorageContext> blob_storage_context);
 
   void AddBinding(::indexed_db::mojom::FactoryAssociatedRequest request);
 
+  void AddDatabaseBinding(
+      std::unique_ptr<::indexed_db::mojom::Database> database,
+      ::indexed_db::mojom::DatabaseAssociatedRequest request);
+
+  void AddCursorBinding(std::unique_ptr<::indexed_db::mojom::Cursor> cursor,
+                        ::indexed_db::mojom::CursorAssociatedRequest request);
+
   // A shortcut for accessing our context.
   IndexedDBContextImpl* context() const { return indexed_db_context_.get(); }
   storage::BlobStorageContext* blob_storage_context() const {
     return blob_storage_context_->context();
   }
   int ipc_process_id() const { return ipc_process_id_; }
 
   std::string HoldBlobData(const IndexedDBBlobInfo& blob_info);
   void DropBlobData(const std::string& uuid);
 
+  // Must be called on the IO thread.
+  base::WeakPtr<IndexedDBDispatcherHost> AsWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
+  // Called by UI thread. Used to kill outstanding bindings and weak pointers
+  // in callbacks.
+  void RenderProcessExited(RenderProcessHost* host,
+                           base::TerminationStatus status,
+                           int exit_code) override;
+
  private:
+  class IDBThreadHelper;
   // Friends to enable OnDestruct() delegation.
   friend class BrowserThread;
   friend class base::DeleteHelper<IndexedDBDispatcherHost>;
 
   ~IndexedDBDispatcherHost() override;
 
   // indexed_db::mojom::Factory implementation:
   void GetDatabaseNames(
       ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info,
       const url::Origin& origin) override;
   void Open(::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info,
             ::indexed_db::mojom::DatabaseCallbacksAssociatedPtrInfo
                 database_callbacks_info,
             const url::Origin& origin,
             const base::string16& name,
             int64_t version,
             int64_t transaction_id) override;
   void DeleteDatabase(
       ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info,
       const url::Origin& origin,
       const base::string16& name,
       bool force_close) override;
 
-  void GetDatabaseNamesOnIDBThread(scoped_refptr<IndexedDBCallbacks> callbacks,
-                                   const url::Origin& origin);
-  void OpenOnIDBThread(
-      scoped_refptr<IndexedDBCallbacks> callbacks,
-      scoped_refptr<IndexedDBDatabaseCallbacks> database_callbacks,
-      const url::Origin& origin,
-      const base::string16& name,
-      int64_t version,
-      int64_t transaction_id);
-  void DeleteDatabaseOnIDBThread(scoped_refptr<IndexedDBCallbacks> callbacks,
-                                 const url::Origin& origin,
-                                 const base::string16& name,
-                                 bool force_close);
+  void InvalidateWeakPtrsAndClearBindings();
 
-  void ResetDispatcherHosts();
-
-  scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
   scoped_refptr<IndexedDBContextImpl> indexed_db_context_;
   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
+  scoped_refptr<base::SequencedTaskRunner> idb_runner_;
 
   // Maps blob uuid to a pair (handle, ref count). Entry is added and/or count
   // is incremented in HoldBlobData(), and count is decremented and/or entry
   // removed in DropBlobData().
   std::map<std::string,
            std::pair<std::unique_ptr<storage::BlobDataHandle>, int>>
       blob_data_handle_map_;
 
   // Used to set file permissions for blob storage.
   const int ipc_process_id_;
 
   mojo::AssociatedBindingSet<::indexed_db::mojom::Factory> bindings_;
 
+  mojo::StrongAssociatedBindingSet<::indexed_db::mojom::Database>
+      database_bindings_;
+
+  mojo::StrongAssociatedBindingSet<::indexed_db::mojom::Cursor>
+      cursor_bindings_;
+
+  IDBThreadHelper* idb_helper_;
+
+  base::WeakPtrFactory<IndexedDBDispatcherHost> weak_factory_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(IndexedDBDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DISPATCHER_HOST_H_