Port messages sent by WebIDBFactoryImpl to Mojo.

content/child/indexed_db/webidbfactory_impl.cc

 // 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.
 
 #include "content/child/indexed_db/webidbfactory_impl.h"
 
-#include "content/child/indexed_db/indexed_db_dispatcher.h"
+#include "content/child/child_thread_impl.h"
+#include "content/child/indexed_db/indexed_db_callbacks_impl.h"
+#include "content/child/indexed_db/indexed_db_database_callbacks_impl.h"
 #include "content/child/storage_util.h"
 #include "content/child/thread_safe_sender.h"
+#include "content/public/child/worker_thread.h"
+#include "ipc/ipc_sync_channel.h"
 #include "third_party/WebKit/public/platform/WebSecurityOrigin.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 using blink::WebIDBCallbacks;
 using blink::WebIDBDatabase;
 using blink::WebIDBDatabaseCallbacks;
 using blink::WebSecurityOrigin;
 using blink::WebString;
 
 namespace content {
 
-WebIDBFactoryImpl::WebIDBFactoryImpl(ThreadSafeSender* thread_safe_sender)
-    : thread_safe_sender_(thread_safe_sender) {}
+class WebIDBFactoryImpl::IOThreadHelper {
+ public:
+  IOThreadHelper(scoped_refptr<IPC::SyncMessageFilter> sync_message_filter);
+  ~IOThreadHelper();
 
-WebIDBFactoryImpl::~WebIDBFactoryImpl() {}
+  void EnsureServiceConnection();
+  void GetDatabaseNames(std::unique_ptr<IndexedDBCallbacksImpl> callbacks,
+                        const url::Origin& origin);
+  void Open(int32_t worker_thread,
+            const base::string16& name,
+            int64_t version,
+            int64_t transaction_id,
+            std::unique_ptr<IndexedDBCallbacksImpl> callbacks,
+            std::unique_ptr<IndexedDBDatabaseCallbacksImpl> database_callbacks,
+            const url::Origin& origin);
+  void DeleteDatabase(const base::string16& name,
+                      std::unique_ptr<IndexedDBCallbacksImpl> callbacks,
+                      const url::Origin& origin);
+
+ private:
+  scoped_refptr<IPC::SyncMessageFilter> sync_message_filter_;
+  indexed_db::mojom::FactoryAssociatedPtr service_;
+};
+
+WebIDBFactoryImpl::WebIDBFactoryImpl(
+    scoped_refptr<IPC::SyncMessageFilter> sync_message_filter,
+    scoped_refptr<ThreadSafeSender> thread_safe_sender,
+    scoped_refptr<base::SingleThreadTaskRunner> io_runner)
+    : thread_safe_sender_(std::move(thread_safe_sender)),
+      io_runner_(std::move(io_runner)) {
+  helper_ = new IOThreadHelper(std::move(sync_message_filter));
+}
+
+WebIDBFactoryImpl::~WebIDBFactoryImpl() {
+  io_runner_->DeleteSoon(FROM_HERE, helper_);
+}
 
 void WebIDBFactoryImpl::getDatabaseNames(WebIDBCallbacks* callbacks,
                                          const WebSecurityOrigin& origin) {
-  IndexedDBDispatcher* dispatcher =
-      IndexedDBDispatcher::ThreadSpecificInstance(thread_safe_sender_.get());
-  dispatcher->RequestIDBFactoryGetDatabaseNames(callbacks, origin);
+  auto callbacks_impl =
+      base::MakeUnique<IndexedDBCallbacksImpl>(callbacks, thread_safe_sender_);
+  io_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IOThreadHelper::GetDatabaseNames, base::Unretained(helper_),
+                 base::Passed(&callbacks_impl), url::Origin(origin)));
 }
 
 void WebIDBFactoryImpl::open(const WebString& name,
                              long long version,
                              long long transaction_id,
                              WebIDBCallbacks* callbacks,
                              WebIDBDatabaseCallbacks* database_callbacks,
                              const WebSecurityOrigin& origin) {
-  IndexedDBDispatcher* dispatcher =
-      IndexedDBDispatcher::ThreadSpecificInstance(thread_safe_sender_.get());
-
-  dispatcher->RequestIDBFactoryOpen(name, version, transaction_id, callbacks,
-                                    database_callbacks, origin);
+  auto callbacks_impl =
+      base::MakeUnique<IndexedDBCallbacksImpl>(callbacks, thread_safe_sender_);
+  auto database_callbacks_impl =
+      base::MakeUnique<IndexedDBDatabaseCallbacksImpl>(database_callbacks);
+  io_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IOThreadHelper::Open, base::Unretained(helper_),
+                 WorkerThread::GetCurrentId(), base::string16(name), version,
+                 transaction_id, base::Passed(&callbacks_impl),
+                 base::Passed(&database_callbacks_impl), url::Origin(origin)));
 }
 
 void WebIDBFactoryImpl::deleteDatabase(const WebString& name,
                                        WebIDBCallbacks* callbacks,
                                        const WebSecurityOrigin& origin) {
-  IndexedDBDispatcher* dispatcher =
-      IndexedDBDispatcher::ThreadSpecificInstance(thread_safe_sender_.get());
-  dispatcher->RequestIDBFactoryDeleteDatabase(name, callbacks, origin);
+  auto callbacks_impl =
+      base::MakeUnique<IndexedDBCallbacksImpl>(callbacks, thread_safe_sender_);
+  io_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IOThreadHelper::DeleteDatabase, base::Unretained(helper_),
+                 base::string16(name), base::Passed(&callbacks_impl),
+                 url::Origin(origin)));
+}
+
+WebIDBFactoryImpl::IOThreadHelper::IOThreadHelper(
+    scoped_refptr<IPC::SyncMessageFilter> sync_message_filter)
+    : sync_message_filter_(std::move(sync_message_filter)) {}
+
+WebIDBFactoryImpl::IOThreadHelper::~IOThreadHelper() {}
+
+void WebIDBFactoryImpl::IOThreadHelper::EnsureServiceConnection() {

[Ken Rockot(use gerrit already), 2016/09/28 20:06:44]

nit: I think it'd just be cleaner to have an accessor which lazily initializes
service_ and returns service_.get().

[Reilly Grant (use Gerrit), 2016/09/29 06:44:50]

I considered that but since I usually need both service_.associated_group() and
service_.get() in each method this was easier.

[Ken Rockot(use gerrit already), 2016/09/29 22:37:50]

Fair enough. You could of course have the lazy getter return a non-const ref to
the Ptr itself. You could also then provide something like:

CallbacksAssociatedPtr WebIDBFactoryImpl::GetCallbacksProxy(
    std::unique_ptr<IndexedDBCallbacksImpl> callbacks) {
  CallbacksAssociatedRequest request;
  CallbacksAssociatedPtrInfo ptr_info;
  service().associated_group()->CreateAssociatedInterface(
      mojo::AssocaiatedGroup::WILL_PASS_PTR, &ptr_info, &request);

  // Passes ownership of |callbacks| to the |request| pipe.
  callbacks->release()->Bind(std::move(request));

  // side note: this would be a really nice use of StrongAssociatedBinding which
  // doesn't (yet) exist:
  //   mojo::MakeStrongAssociatedBinding(std::move(callbacks),
std::move(request));
  // and then we don't need a scary release() and callbacks doesn't need to own
  // any kind of Binding object.

  CallbacksAssociatedPtr ptr;
  ptr.Bind(std::move(ptr_info));
  return ptr;
}


You could do the same for DatabaseCallbacks.

Then you can get rid of Ensure... and all your usage sites look like:

  service()->DeleteDatabase(CreateCallbacksProxy(std::move(callbacks)), origin,
name);

Which IMHO is much easier to read.


Biased opinion, but I really like my suggestion. WDYT about these changes?

[Reilly Grant (use Gerrit), 2016/09/30 07:24:20]

Oh look! Now there's a StrongAssociatedBinding.

+  if (!service_)
+    sync_message_filter_->GetRemoteAssociatedInterface(&service_);
+}
+
+void WebIDBFactoryImpl::IOThreadHelper::GetDatabaseNames(
+    std::unique_ptr<IndexedDBCallbacksImpl> callbacks,
+    const url::Origin& origin) {
+  EnsureServiceConnection();
+
+  indexed_db::mojom::CallbacksAssociatedPtrInfo mojo_callbacks;
+  callbacks.release()->Bind(&mojo_callbacks, service_.associated_group());
+
+  service_->GetDatabaseNames(std::move(mojo_callbacks), origin);
+}
+
+void WebIDBFactoryImpl::IOThreadHelper::Open(
+    int32_t worker_thread,
+    const base::string16& name,
+    int64_t version,
+    int64_t transaction_id,
+    std::unique_ptr<IndexedDBCallbacksImpl> callbacks,
+    std::unique_ptr<IndexedDBDatabaseCallbacksImpl> database_callbacks,
+    const url::Origin& origin) {
+  EnsureServiceConnection();
+
+  indexed_db::mojom::CallbacksAssociatedPtrInfo mojo_callbacks;
+  callbacks.release()->Bind(&mojo_callbacks, service_.associated_group());
+  indexed_db::mojom::DatabaseCallbacksAssociatedPtrInfo mojo_database_callbacks;
+  database_callbacks.release()->Bind(&mojo_database_callbacks,
+                                     service_.associated_group());
+
+  service_->Open(worker_thread, std::move(mojo_callbacks),
+                 std::move(mojo_database_callbacks), origin, name, version,
+                 transaction_id);
+}
+
+void WebIDBFactoryImpl::IOThreadHelper::DeleteDatabase(
+    const base::string16& name,
+    std::unique_ptr<IndexedDBCallbacksImpl> callbacks,
+    const url::Origin& origin) {
+  EnsureServiceConnection();
+
+  indexed_db::mojom::CallbacksAssociatedPtrInfo mojo_callbacks;
+  callbacks.release()->Bind(&mojo_callbacks, service_.associated_group());
+
+  service_->DeleteDatabase(std::move(mojo_callbacks), origin, name);
 }
 
 }  // namespace content