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// Copyright 2017 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 "third_party/blink/renderer/modules/indexeddb/idb_request_loader.h"
#include "third_party/blink/public/platform/modules/indexeddb/web_idb_database_exception.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/fileapi/file_reader_loader.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_request.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_request_queue_item.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_value.h"
#include "third_party/blink/renderer/modules/indexeddb/idb_value_wrapping.h"
#include "third_party/blink/renderer/platform/histogram.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
namespace blink {
IDBRequestLoader::IDBRequestLoader(
IDBRequestQueueItem* queue_item,
Vector<std::unique_ptr<IDBValue>>& result_values)
: queue_item_(queue_item), values_(result_values) {
DCHECK(IDBValueUnwrapper::IsWrapped(values_));
}
IDBRequestLoader::~IDBRequestLoader() {
// TODO(pwnall): Do we need to call loader_->Cancel() here?
}
void IDBRequestLoader::Start() {
#if DCHECK_IS_ON()
DCHECK(!started_) << "Start() was already called";
started_ = true;
#endif // DCHECK_IS_ON()
// TODO(pwnall): Start() / StartNextValue() unwrap large values sequentially.
// Consider parallelizing. The main issue is that the Blob reads
// will have to be throttled somewhere, and the extra complexity
// only benefits applications that use getAll().
current_value_ = values_.begin();
StartNextValue();
}
void IDBRequestLoader::Cancel() {
#if DCHECK_IS_ON()
DCHECK(started_) << "Cancel() called on a loader that hasn't been Start()ed";
DCHECK(!canceled_) << "Cancel() was already called";
canceled_ = true;
DCHECK(file_reader_loading_);
file_reader_loading_ = false;
#endif // DCHECK_IS_ON()
if (loader_)
loader_->Cancel();
}
void IDBRequestLoader::StartNextValue() {
IDBValueUnwrapper unwrapper;
while (true) {
if (current_value_ == values_.end()) {
ReportSuccess();
return;
}
if (unwrapper.Parse(current_value_->get()))
break;
++current_value_;
}
DCHECK(current_value_ != values_.end());
wrapped_data_.ReserveCapacity(unwrapper.WrapperBlobSize());
#if DCHECK_IS_ON()
DCHECK(!file_reader_loading_);
file_reader_loading_ = true;
#endif // DCHECK_IS_ON()
loader_ = FileReaderLoader::Create(FileReaderLoader::kReadByClient, this);
loader_->Start(unwrapper.WrapperBlobHandle());
}
void IDBRequestLoader::DidStartLoading() {}
void IDBRequestLoader::DidReceiveDataForClient(const char* data,
unsigned data_length) {
DCHECK_LE(wrapped_data_.size() + data_length, wrapped_data_.capacity())
<< "The reader returned more data than we were prepared for";
wrapped_data_.Append(data, data_length);
}
void IDBRequestLoader::DidFinishLoading() {
#if DCHECK_IS_ON()
DCHECK(started_)
<< "FileReaderLoader called DidFinishLoading() before it was Start()ed";
DCHECK(!canceled_)
<< "FileReaderLoader called DidFinishLoading() after it was Cancel()ed";
DCHECK(file_reader_loading_);
file_reader_loading_ = false;
#endif // DCHECK_IS_ON()
IDBValueUnwrapper::Unwrap(SharedBuffer::AdoptVector(wrapped_data_),
current_value_->get());
++current_value_;
StartNextValue();
}
void IDBRequestLoader::DidFail(FileError::ErrorCode) {
#if DCHECK_IS_ON()
DCHECK(started_)
<< "FileReaderLoader called DidFail() before it was Start()ed";
DCHECK(!canceled_)
<< "FileReaderLoader called DidFail() after it was Cancel()ed";
DCHECK(file_reader_loading_);
file_reader_loading_ = false;
#endif // DCHECK_IS_ON()
DEFINE_THREAD_SAFE_STATIC_LOCAL(SparseHistogram,
idb_request_loader_read_errors_histogram,
("Storage.Blob.IDBRequestLoader.ReadError"));
idb_request_loader_read_errors_histogram.Sample(
std::max(0, -loader_->GetNetError()));
ReportError();
}
void IDBRequestLoader::ReportSuccess() {
#if DCHECK_IS_ON()
DCHECK(started_);
DCHECK(!canceled_);
#endif // DCHECK_IS_ON()
queue_item_->OnResultLoadComplete();
}
void IDBRequestLoader::ReportError() {
#if DCHECK_IS_ON()
DCHECK(started_);
DCHECK(!canceled_);
#endif // DCHECK_IS_ON()
queue_item_->OnResultLoadComplete(DOMException::Create(
DOMExceptionCode::kDataError, "Failed to read large IndexedDB value"));
}
} // namespace blink
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