[BlobAsync] Disk support for blob storage

storage/browser/blob/blob_data_handle.cc

 // Copyright (c) 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 "storage/browser/blob/blob_data_handle.h"
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/sequenced_task_runner.h"
 #include "base/task_runner.h"
 #include "base/time/time.h"
 #include "storage/browser/blob/blob_data_snapshot.h"
 #include "storage/browser/blob/blob_reader.h"
 #include "storage/browser/blob/blob_storage_context.h"
 #include "storage/browser/fileapi/file_stream_reader.h"
 #include "storage/browser/fileapi/file_system_context.h"
 #include "storage/browser/fileapi/file_system_url.h"
 #include "url/gurl.h"
 
 namespace storage {
-using BlobState = BlobStorageRegistry::BlobState;
-
 namespace {
 
 class FileStreamReaderProviderImpl
     : public BlobReader::FileStreamReaderProvider {
  public:
   explicit FileStreamReaderProviderImpl(FileSystemContext* file_system_context)
       : file_system_context_(file_system_context) {}
   ~FileStreamReaderProviderImpl() override {}
 
   std::unique_ptr<FileStreamReader> CreateForLocalFile(
@@ skipping 19 matching lines @@
   scoped_refptr<FileSystemContext> file_system_context_;
   DISALLOW_COPY_AND_ASSIGN(FileStreamReaderProviderImpl);
 };
 
 }  // namespace
 
 BlobDataHandle::BlobDataHandleShared::BlobDataHandleShared(
     const std::string& uuid,
     const std::string& content_type,
     const std::string& content_disposition,
+    uint64_t size,
     BlobStorageContext* context)
     : uuid_(uuid),
       content_type_(content_type),
       content_disposition_(content_disposition),
+      size_(size),
       context_(context->AsWeakPtr()) {
   context_->IncrementBlobRefCount(uuid);
 }
 
 std::unique_ptr<BlobReader> BlobDataHandle::CreateReader(
     FileSystemContext* file_system_context,
     base::SequencedTaskRunner* file_task_runner) const {
   return std::unique_ptr<BlobReader>(new BlobReader(
       this, std::unique_ptr<BlobReader::FileStreamReaderProvider>(
                 new FileStreamReaderProviderImpl(file_system_context)),
       file_task_runner));
 }
 
 BlobDataHandle::BlobDataHandleShared::~BlobDataHandleShared() {
   if (context_.get())
     context_->DecrementBlobRefCount(uuid_);
 }
 
 BlobDataHandle::BlobDataHandle(const std::string& uuid,
                                const std::string& content_type,
                                const std::string& content_disposition,
+                               uint64_t size,
                                BlobStorageContext* context,
                                base::SequencedTaskRunner* io_task_runner)
     : io_task_runner_(io_task_runner),
       shared_(new BlobDataHandleShared(uuid,
                                        content_type,
                                        content_disposition,
+                                       size,
                                        context)) {
   DCHECK(io_task_runner_.get());
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 }
 
 BlobDataHandle::BlobDataHandle(const BlobDataHandle& other) {
   io_task_runner_ = other.io_task_runner_;
   shared_ = other.shared_;
 }
 
 BlobDataHandle::~BlobDataHandle() {
   if (!io_task_runner_->RunsTasksOnCurrentThread()) {
     BlobDataHandleShared* raw = shared_.get();
     raw->AddRef();
     shared_ = nullptr;
     io_task_runner_->ReleaseSoon(FROM_HERE, raw);
   }
 }
 
 bool BlobDataHandle::IsBeingBuilt() const {
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
   if (!shared_->context_)
     return false;
-  return shared_->context_->IsBeingBuilt(shared_->uuid_);
+  return BlobStatusIsPending(GetBlobStatus());
 }
 
 bool BlobDataHandle::IsBroken() const {
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
   if (!shared_->context_)
     return true;
-  return shared_->context_->IsBroken(shared_->uuid_);
+  return BlobStatusIsError(GetBlobStatus());
 }
 
-void BlobDataHandle::RunOnConstructionComplete(
-    const BlobConstructedCallback& done) {
+BlobStatus BlobDataHandle::GetBlobStatus() const {
+  return shared_->context_->GetBlobStatus(shared_->uuid_);
+}
+
+void BlobDataHandle::RunOnConstructionComplete(const BlobStatusCallback& done) {
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
   if (!shared_->context_.get()) {
-    done.Run(false, IPCBlobCreationCancelCode::UNKNOWN);
+    done.Run(BlobStatus::ERR_INVALID_CONSTRUCTION_ARGUMENTS);
     return;
   }
   shared_->context_->RunOnConstructionComplete(shared_->uuid_, done);
 }
 
 std::unique_ptr<BlobDataSnapshot> BlobDataHandle::CreateSnapshot() const {
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
   if (!shared_->context_.get())
     return nullptr;
   return shared_->context_->CreateSnapshot(shared_->uuid_);
 }
 
 const std::string& BlobDataHandle::uuid() const {
   return shared_->uuid_;
 }
 
 const std::string& BlobDataHandle::content_type() const {
   return shared_->content_type_;
 }
 
 const std::string& BlobDataHandle::content_disposition() const {
   return shared_->content_disposition_;
 }
 
+uint64_t BlobDataHandle::size() const {
+  return shared_->size_;
+}
+
 }  // namespace storage