Index: storage/browser/blob/blob_async_transport_strategy.cc |
diff --git a/storage/browser/blob/blob_async_transport_strategy.cc b/storage/browser/blob/blob_async_transport_strategy.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..995194056587f8bb7653d900f301259e9e49526b |
--- /dev/null |
+++ b/storage/browser/blob/blob_async_transport_strategy.cc |
@@ -0,0 +1,309 @@ |
+// Copyright 2015 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 <algorithm> |
+ |
+#include "storage/browser/blob/blob_async_transport_strategy.h" |
+#include "storage/common/blob_storage/blob_storage_constants.h" |
+ |
+namespace storage { |
+namespace { |
+bool IsBytes(DataElement::Type type) { |
+ return type == DataElement::TYPE_BYTES || |
+ type == DataElement::TYPE_BYTES_DESCRIPTION; |
+} |
+} // namespace |
+ |
+// This class handles the logic of how transported memory is going to be |
+// represented as storage in the browser. The main idea is that all the memory |
+// is now packed into file chunks, and the browser items will just reference |
+// the file with offsets and sizes. |
+class FileStorageStrategy |
+ : public BlobAsyncTransportStrategy::BlobSegmentVisitor<uint64_t> { |
+ public: |
+ typedef uint64_t SizeType; |
+ |
+ FileStorageStrategy( |
+ std::vector<BlobAsyncTransportStrategy::RendererMemoryItemRequest>* |
+ requests, |
+ BlobDataBuilder* builder) |
+ : requests(requests), builder(builder), current_item_index(0) {} |
+ |
+ ~FileStorageStrategy() override {} |
+ |
+ void VisitBytesSegment(size_t element_index, |
+ SizeType element_offset, |
+ size_t segment_index, |
+ SizeType segment_offset, |
+ SizeType size) override { |
+ BlobAsyncTransportStrategy::RendererMemoryItemRequest request; |
+ request.browser_item_index = current_item_index; |
+ request.browser_item_offset = 0; |
+ request.message.request_number = requests->size(); |
+ request.message.transport_strategy = IPCBlobItemRequestStrategy::FILE; |
+ request.message.renderer_item_index = element_index; |
+ request.message.renderer_item_offset = element_offset; |
+ request.message.size = size; |
+ request.message.handle_index = segment_index; |
+ request.message.handle_offset = segment_offset; |
+ |
+ requests->push_back(request); |
+ builder->AppendFutureFile(segment_offset, size); |
+ current_item_index++; |
+ } |
+ |
+ void VisitNonBytesSegment(const DataElement& element, |
+ size_t element_index) override { |
+ builder->AppendIPCDataElement(element); |
+ current_item_index++; |
+ } |
+ |
+ void Done() override {} |
+ |
+ std::vector<BlobAsyncTransportStrategy::RendererMemoryItemRequest>* requests; |
+ BlobDataBuilder* builder; |
+ |
+ size_t current_item_index; |
+}; |
+ |
+// This class handles the logic of storing memory that is transported as |
+// consolidated shared memory. |
+class SharedMemoryStorageStrategy |
+ : public BlobAsyncTransportStrategy::BlobSegmentVisitor<size_t> { |
+ public: |
+ typedef size_t SizeType; |
+ |
+ SharedMemoryStorageStrategy( |
+ SizeType max_segment_size, |
+ std::vector<BlobAsyncTransportStrategy::RendererMemoryItemRequest>* |
+ requests, |
+ BlobDataBuilder* builder) |
+ : requests(requests), |
+ max_segment_size(max_segment_size), |
+ builder(builder), |
+ current_item_size(0), |
+ current_item_index(0) {} |
+ ~SharedMemoryStorageStrategy() override {} |
+ |
+ void VisitBytesSegment(size_t element_index, |
+ SizeType element_offset, |
+ size_t segment_index, |
+ SizeType segment_offset, |
+ SizeType size) override { |
+ if (current_item_size + size > max_segment_size) { |
+ builder->AppendFutureData(current_item_size); |
+ current_item_index++; |
+ current_item_size = 0; |
+ } |
+ BlobAsyncTransportStrategy::RendererMemoryItemRequest request; |
+ request.browser_item_index = current_item_index; |
+ request.browser_item_offset = current_item_size; |
+ request.message.request_number = requests->size(); |
+ request.message.transport_strategy = |
+ IPCBlobItemRequestStrategy::SHARED_MEMORY; |
+ request.message.renderer_item_index = element_index; |
+ request.message.renderer_item_offset = element_offset; |
+ request.message.size = size; |
+ request.message.handle_index = segment_index; |
+ request.message.handle_offset = segment_offset; |
+ |
+ requests->push_back(request); |
+ current_item_size += size; |
+ }; |
+ |
+ void VisitNonBytesSegment(const DataElement& element, |
+ size_t element_index) override { |
+ if (current_item_size != 0) { |
+ builder->AppendFutureData(current_item_size); |
+ current_item_index++; |
+ } |
+ builder->AppendIPCDataElement(element); |
+ current_item_index++; |
+ current_item_size = 0; |
+ } |
+ |
+ void Done() override { |
+ if (current_item_size != 0) { |
+ builder->AppendFutureData(current_item_size); |
+ } |
+ } |
+ |
+ std::vector<BlobAsyncTransportStrategy::RendererMemoryItemRequest>* requests; |
+ |
+ SizeType max_segment_size; |
+ BlobDataBuilder* builder; |
+ SizeType current_item_size; |
+ size_t current_item_index; |
+}; |
+ |
+BlobAsyncTransportStrategy::RendererMemoryItemRequest:: |
+ RendererMemoryItemRequest() |
+ : browser_item_index(0), browser_item_offset(0), received(false) {} |
+ |
+BlobAsyncTransportStrategy::BlobAsyncTransportStrategy() |
+ : error_(BlobAsyncTransportStrategy::ERROR_NONE), total_bytes_size_(0) {} |
+ |
+BlobAsyncTransportStrategy::~BlobAsyncTransportStrategy() {} |
+ |
+// if total_blob_size > kMaxBlobSize (say 400MB) |
+// Request all data in files |
+// (Segment all of the existing data into |
+// file blocks, of <= kMaxFileSize) |
+// else if total_blob_size > kMaxIPCSize (this is 150KB) |
+// Request all data in shared memory |
+// (Segment all of the existing data into |
+// shared memory blocks, of <= kMaxSharedMemorySize) |
+// else |
+// Request all data to be sent over IPC |
+void BlobAsyncTransportStrategy::Initialize( |
+ size_t max_ipc_memory_size, |
+ size_t max_shared_memory_size, |
+ uint64_t max_file_size, |
+ uint64_t disk_space_left, |
+ size_t memory_available, |
+ const std::string& uuid, |
+ const std::vector<DataElement>& blob_item_infos) { |
+ DCHECK(file_handle_sizes_.empty()); |
+ DCHECK(shared_memory_handle_sizes_.empty()); |
+ DCHECK(requests_.empty()); |
+ DCHECK(!builder_.get()); |
+ builder_.reset(new BlobDataBuilder(uuid)); |
+ error_ = BlobAsyncTransportStrategy::ERROR_NONE; |
+ |
+ size_t memory_items = 0; |
+ total_bytes_size_ = 0; |
+ for (const auto& info : blob_item_infos) { |
+ if (!IsBytes(info.type())) { |
+ continue; |
+ } |
+ total_bytes_size_ += info.length(); |
+ ++memory_items; |
+ } |
+ |
+ // See if we have enough memory |
kinuko
2015/11/25 16:08:17
nit: finish comment with period
dmurph
2015/11/25 21:16:30
Done.
|
+ if (total_bytes_size_ > |
+ disk_space_left + static_cast<uint64_t>(memory_available)) { |
+ error_ = BlobAsyncTransportStrategy::ERROR_TOO_LARGE; |
+ return; |
+ } |
+ |
+ // If we're more than the available memory, then we're going straight to disk. |
+ if (total_bytes_size_ > memory_available) { |
+ if (total_bytes_size_ > disk_space_left) { |
+ error_ = BlobAsyncTransportStrategy::ERROR_TOO_LARGE; |
+ return; |
+ } |
+ ComputeHandleSizes(total_bytes_size_, max_file_size, &file_handle_sizes_); |
+ FileStorageStrategy strategy(&requests_, builder_.get()); |
+ ForEachWithSegment(blob_item_infos, max_file_size, &strategy); |
+ return; |
+ } |
+ |
+ if (total_bytes_size_ > max_ipc_memory_size) { |
+ CHECK_LE(total_bytes_size_, std::numeric_limits<size_t>::max()); |
+ ComputeHandleSizes(static_cast<size_t>(total_bytes_size_), |
+ max_shared_memory_size, &shared_memory_handle_sizes_); |
+ SharedMemoryStorageStrategy strategy(max_shared_memory_size, &requests_, |
+ builder_.get()); |
+ ForEachWithSegment(blob_item_infos, max_shared_memory_size, &strategy); |
+ return; |
+ } |
+ |
+ // Since they can all fit in IPC memory, we don't need to segment anything, |
+ // and just request them straight in IPC. |
+ size_t items_length = blob_item_infos.size(); |
+ for (size_t i = 0; i < items_length; i++) { |
+ const auto& info = blob_item_infos.at(i); |
+ if (!IsBytes(info.type())) { |
+ builder_->AppendIPCDataElement(info); |
+ continue; |
+ } |
+ BlobAsyncTransportStrategy::RendererMemoryItemRequest request; |
+ request.browser_item_index = i; |
+ request.browser_item_offset = 0; |
+ request.message.request_number = requests_.size(); |
+ request.message.transport_strategy = IPCBlobItemRequestStrategy::IPC; |
+ request.message.renderer_item_index = i; |
+ request.message.renderer_item_offset = 0; |
+ request.message.size = info.length(); |
+ requests_.push_back(request); |
+ builder_->AppendFutureData(info.length()); |
+ } |
+} |
+ |
+// Splits each |element| into one or more |segments| of a max_size, invokes the |
+// strategy to determine the request to make for each |segment| produced. A |
+// |segment| can also span multiple |elements|. |
+/* static */ |
+template <typename SizeType> |
+void BlobAsyncTransportStrategy::ForEachWithSegment( |
+ const std::vector<DataElement>& elements, |
+ SizeType max_segment_size, |
+ BlobSegmentVisitor<SizeType>* visitor) { |
+ DCHECK_GT(max_segment_size, 0ull); |
+ size_t segment_index = 0; |
+ SizeType segment_offset = 0; |
+ size_t elements_length = elements.size(); |
+ for (size_t element_index = 0; element_index < elements_length; |
+ ++element_index) { |
+ const auto& element = elements.at(element_index); |
+ DataElement::Type type = element.type(); |
+ if (!IsBytes(type)) { |
+ visitor->VisitNonBytesSegment(element, element_index); |
+ continue; |
+ } |
+ SizeType element_memory_left = element.length(); |
+ SizeType element_offset = 0; |
+ while (element_memory_left > 0) { |
+ if (segment_offset == max_segment_size) { |
+ ++segment_index; |
+ segment_offset = 0; |
+ } |
+ SizeType memory_writing = |
+ std::min(max_segment_size - segment_offset, element_memory_left); |
+ visitor->VisitBytesSegment(element_index, element_offset, segment_index, |
+ segment_offset, memory_writing); |
+ element_memory_left -= memory_writing; |
+ segment_offset += memory_writing; |
+ element_offset += memory_writing; |
+ } |
+ } |
+ visitor->Done(); |
+} |
+ |
+/* static */ |
+bool BlobAsyncTransportStrategy::ShouldBeShortcut( |
+ const std::vector<DataElement>& elements, |
+ size_t memory_available) { |
+ size_t shortcut_bytes = 0; |
+ for (const auto& element : elements) { |
+ DataElement::Type type = element.type(); |
+ if (type == DataElement::TYPE_BYTES_DESCRIPTION) { |
+ return false; |
+ } |
+ if (type == DataElement::TYPE_BYTES) { |
+ shortcut_bytes += element.length(); |
+ } |
+ } |
+ return shortcut_bytes <= memory_available; |
+} |
+ |
+/* static */ |
+template <typename SizeType> |
+void BlobAsyncTransportStrategy::ComputeHandleSizes( |
+ SizeType total_memory_size, |
+ SizeType max_segment_size, |
+ std::vector<SizeType>* segment_sizes) { |
+ size_t total_max_segments = |
+ static_cast<size_t>(total_memory_size / max_segment_size); |
+ bool hasExtraSegment = (total_memory_size % max_segment_size) > 0; |
+ segment_sizes->reserve(total_max_segments + (hasExtraSegment ? 1 : 0)); |
+ segment_sizes->insert(segment_sizes->begin(), total_max_segments, |
+ max_segment_size); |
+ if (hasExtraSegment) { |
+ segment_sizes->push_back(total_memory_size % max_segment_size); |
+ } |
+} |
+ |
+} // namespace storage |