[BlobAsync] Moving async handling into BlobStorageContext & quota out.

storage/browser/blob/blob_async_builder_host.cc

Index: storage/browser/blob/blob_async_builder_host.cc
diff --git a/storage/browser/blob/blob_async_builder_host.cc b/storage/browser/blob/blob_async_builder_host.cc
deleted file mode 100644
index a73d9d683232ff5ca6772e8fe7227c5afe1f9d22..0000000000000000000000000000000000000000
--- a/storage/browser/blob/blob_async_builder_host.cc
+++ /dev/null
@@ -1,465 +0,0 @@
-// 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 "storage/browser/blob/blob_async_builder_host.h"
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-#include <utility>
-
-#include "base/bind.h"
-#include "base/memory/ptr_util.h"
-#include "base/memory/shared_memory.h"
-#include "storage/browser/blob/blob_data_handle.h"
-#include "storage/browser/blob/blob_storage_context.h"
-
-namespace storage {
-namespace {
-
-bool CalculateBlobMemorySize(const std::vector<DataElement>& elements,
-                             size_t* shortcut_bytes,
-                             uint64_t* total_bytes) {
-  DCHECK(shortcut_bytes);
-  DCHECK(total_bytes);
-  base::CheckedNumeric<uint64_t> total_size_checked = 0;
-  base::CheckedNumeric<size_t> shortcut_size_checked = 0;
-  for (const auto& e : elements) {
-    if (e.type() == DataElement::TYPE_BYTES) {
-      total_size_checked += e.length();
-      shortcut_size_checked += e.length();
-    } else if (e.type() == DataElement::TYPE_BYTES_DESCRIPTION) {
-      total_size_checked += e.length();
-    } else {
-      continue;
-    }
-    if (!total_size_checked.IsValid() || !shortcut_size_checked.IsValid()) {
-      return false;
-    }
-  }
-  *shortcut_bytes = shortcut_size_checked.ValueOrDie();
-  *total_bytes = total_size_checked.ValueOrDie();
-  return true;
-}
-
-IPCBlobCreationCancelCode ConvertReferencedBlobErrorToConstructingError(
-    IPCBlobCreationCancelCode referenced_blob_error) {
-  switch (referenced_blob_error) {
-    // For most cases we propagate the error.
-    case IPCBlobCreationCancelCode::FILE_WRITE_FAILED:
-    case IPCBlobCreationCancelCode::SOURCE_DIED_IN_TRANSIT:
-    case IPCBlobCreationCancelCode::REFERENCED_BLOB_BROKEN:
-    case IPCBlobCreationCancelCode::OUT_OF_MEMORY:
-      return referenced_blob_error;
-    // Others we report that the referenced blob is broken, as we don't know
-    // why (the BLOB_DEREFERENCED_WHILE_BUILDING should never happen, as we hold
-    // onto the reference of the blobs we're using).
-    case IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING:
-      DCHECK(false) << "Referenced blob should never be dereferenced while we "
-                    << "are depending on it, as our system holds a handle.";
-    case IPCBlobCreationCancelCode::UNKNOWN:
-      return IPCBlobCreationCancelCode::REFERENCED_BLOB_BROKEN;
-  }
-  NOTREACHED();
-  return IPCBlobCreationCancelCode::REFERENCED_BLOB_BROKEN;
-}
-
-}  // namespace
-
-using MemoryItemRequest =
-    BlobAsyncTransportRequestBuilder::RendererMemoryItemRequest;
-
-BlobAsyncBuilderHost::BlobBuildingState::BlobBuildingState(
-    const std::string& uuid,
-    std::set<std::string> referenced_blob_uuids,
-    std::vector<std::unique_ptr<BlobDataHandle>>* referenced_blob_handles)
-    : data_builder(uuid),
-      referenced_blob_uuids(referenced_blob_uuids),
-      referenced_blob_handles(std::move(*referenced_blob_handles)) {}
-
-BlobAsyncBuilderHost::BlobBuildingState::~BlobBuildingState() {}
-
-BlobAsyncBuilderHost::BlobAsyncBuilderHost() : ptr_factory_(this) {}
-
-BlobAsyncBuilderHost::~BlobAsyncBuilderHost() {}
-
-BlobTransportResult BlobAsyncBuilderHost::RegisterBlobUUID(
-    const std::string& uuid,
-    const std::string& content_type,
-    const std::string& content_disposition,
-    const std::set<std::string>& referenced_blob_uuids,
-    BlobStorageContext* context) {
-  if (async_blob_map_.find(uuid) != async_blob_map_.end())
-    return BlobTransportResult::BAD_IPC;
-  if (referenced_blob_uuids.find(uuid) != referenced_blob_uuids.end())
-    return BlobTransportResult::BAD_IPC;
-  context->CreatePendingBlob(uuid, content_type, content_disposition);
-  std::vector<std::unique_ptr<BlobDataHandle>> handles;
-  for (const std::string& referenced_uuid : referenced_blob_uuids) {
-    std::unique_ptr<BlobDataHandle> handle =
-        context->GetBlobDataFromUUID(referenced_uuid);
-    if (!handle || handle->IsBroken()) {
-      // We cancel the blob right away, and don't bother storing our state.
-      context->CancelPendingBlob(
-          uuid, IPCBlobCreationCancelCode::REFERENCED_BLOB_BROKEN);
-      return BlobTransportResult::CANCEL_REFERENCED_BLOB_BROKEN;
-    }
-    handles.emplace_back(std::move(handle));
-  }
-  async_blob_map_[uuid] = base::MakeUnique<BlobBuildingState>(
-      uuid, referenced_blob_uuids, &handles);
-  return BlobTransportResult::DONE;
-}
-
-BlobTransportResult BlobAsyncBuilderHost::StartBuildingBlob(
-    const std::string& uuid,
-    const std::vector<DataElement>& elements,
-    size_t memory_available,
-    BlobStorageContext* context,
-    const RequestMemoryCallback& request_memory) {
-  DCHECK(context);
-  DCHECK(async_blob_map_.find(uuid) != async_blob_map_.end());
-
-  // Step 1: Get the sizes.
-  size_t shortcut_memory_size_bytes = 0;
-  uint64_t total_memory_size_bytes = 0;
-  if (!CalculateBlobMemorySize(elements, &shortcut_memory_size_bytes,
-                               &total_memory_size_bytes)) {
-    CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-    return BlobTransportResult::BAD_IPC;
-  }
-
-  // Step 2: Check if we have enough memory to store the blob.
-  if (total_memory_size_bytes > memory_available) {
-    CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::OUT_OF_MEMORY, context);
-    return BlobTransportResult::CANCEL_MEMORY_FULL;
-  }
-
-  // From here on, we know we can fit the blob in memory.
-  BlobBuildingState* state_ptr = async_blob_map_[uuid].get();
-  if (!state_ptr->request_builder.requests().empty()) {
-    // Check that we're not a duplicate call.
-    return BlobTransportResult::BAD_IPC;
-  }
-  state_ptr->request_memory_callback = request_memory;
-
-  // Step 3: Check to make sure the referenced blob information we received
-  //         earlier is correct:
-  std::set<std::string> extracted_blob_uuids;
-  for (const DataElement& e : elements) {
-    if (e.type() == DataElement::TYPE_BLOB) {
-      extracted_blob_uuids.insert(e.blob_uuid());
-      // We can't depend on ourselves.
-      if (e.blob_uuid() == uuid) {
-        CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-        return BlobTransportResult::BAD_IPC;
-      }
-    }
-  }
-  if (extracted_blob_uuids != state_ptr->referenced_blob_uuids) {
-    CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-    return BlobTransportResult::BAD_IPC;
-  }
-
-  // Step 4: Decide if we're using the shortcut method. This will also catch
-  //         the case where we don't have any memory items.
-  if (shortcut_memory_size_bytes == total_memory_size_bytes &&
-      shortcut_memory_size_bytes <= memory_available) {
-    for (const DataElement& e : elements) {
-      state_ptr->data_builder.AppendIPCDataElement(e);
-    }
-    FinishBuildingBlob(state_ptr, context);
-    return BlobTransportResult::DONE;
-  }
-
-  // From here on, we know the blob's size is less than |memory_available|,
-  // so we know we're < max(size_t).
-  // Step 5: Decide if we're using shared memory.
-  if (total_memory_size_bytes > max_ipc_memory_size_) {
-    state_ptr->request_builder.InitializeForSharedMemoryRequests(
-        max_shared_memory_size_, total_memory_size_bytes, elements,
-        &(state_ptr->data_builder));
-  } else {
-    // Step 6: We can fit in IPC.
-    state_ptr->request_builder.InitializeForIPCRequests(
-        max_ipc_memory_size_, total_memory_size_bytes, elements,
-        &(state_ptr->data_builder));
-  }
-  // We initialize our requests received state now that they are populated.
-  state_ptr->request_received.resize(
-      state_ptr->request_builder.requests().size(), false);
-  return ContinueBlobMemoryRequests(uuid, context);
-}
-
-BlobTransportResult BlobAsyncBuilderHost::OnMemoryResponses(
-    const std::string& uuid,
-    const std::vector<BlobItemBytesResponse>& responses,
-    BlobStorageContext* context) {
-  AsyncBlobMap::const_iterator state_it = async_blob_map_.find(uuid);
-  if (state_it == async_blob_map_.end()) {
-    DVLOG(1) << "Could not find blob " << uuid;
-    return BlobTransportResult::BAD_IPC;
-  }
-  if (responses.empty()) {
-    CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-    return BlobTransportResult::BAD_IPC;
-  }
-  BlobAsyncBuilderHost::BlobBuildingState* state = state_it->second.get();
-  BlobAsyncTransportRequestBuilder& request_builder = state->request_builder;
-  const auto& requests = request_builder.requests();
-  for (const BlobItemBytesResponse& response : responses) {
-    if (response.request_number >= requests.size()) {
-      // Bad IPC, so we delete our record and ignore.
-      DVLOG(1) << "Invalid request number " << response.request_number;
-      CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-      return BlobTransportResult::BAD_IPC;
-    }
-    DCHECK_LT(response.request_number, state->request_received.size());
-    const MemoryItemRequest& request = requests[response.request_number];
-    if (state->request_received[response.request_number]) {
-      // Bad IPC, so we delete our record.
-      DVLOG(1) << "Already received response for that request.";
-      CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-      return BlobTransportResult::BAD_IPC;
-    }
-    state->request_received[response.request_number] = true;
-    bool invalid_ipc = false;
-    bool memory_error = false;
-    switch (request.message.transport_strategy) {
-      case IPCBlobItemRequestStrategy::IPC:
-        if (response.inline_data.size() < request.message.size) {
-          DVLOG(1) << "Invalid data size " << response.inline_data.size()
-                   << " vs requested size of " << request.message.size;
-          invalid_ipc = true;
-          break;
-        }
-        invalid_ipc = !state->data_builder.PopulateFutureData(
-            request.browser_item_index, &response.inline_data[0],
-            request.browser_item_offset, request.message.size);
-        break;
-      case IPCBlobItemRequestStrategy::SHARED_MEMORY:
-        if (state->num_shared_memory_requests == 0) {
-          DVLOG(1) << "Received too many responses for shared memory.";
-          invalid_ipc = true;
-          break;
-        }
-        state->num_shared_memory_requests--;
-        if (!state->shared_memory_block->memory()) {
-          // We just map the whole block, as we'll probably be accessing the
-          // whole thing in this group of responses. Another option is to use
-          // MapAt, remove the mapped boolean, and then exclude the
-          // handle_offset below.
-          size_t handle_size = request_builder.shared_memory_sizes()
-                                   [state->current_shared_memory_handle_index];
-          if (!state->shared_memory_block->Map(handle_size)) {
-            DVLOG(1) << "Unable to map memory to size " << handle_size;
-            memory_error = true;
-            break;
-          }
-        }
-
-        invalid_ipc = !state->data_builder.PopulateFutureData(
-            request.browser_item_index,
-            static_cast<const char*>(state->shared_memory_block->memory()) +
-                request.message.handle_offset,
-            request.browser_item_offset, request.message.size);
-        break;
-      case IPCBlobItemRequestStrategy::FILE:
-      case IPCBlobItemRequestStrategy::UNKNOWN:
-        DVLOG(1) << "Not implemented.";
-        invalid_ipc = true;
-        break;
-    }
-    if (invalid_ipc) {
-      // Bad IPC, so we delete our record and return false.
-      CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::UNKNOWN, context);
-      return BlobTransportResult::BAD_IPC;
-    }
-    if (memory_error) {
-      DVLOG(1) << "Shared memory error.";
-      CancelBuildingBlob(uuid, IPCBlobCreationCancelCode::OUT_OF_MEMORY,
-                         context);
-      return BlobTransportResult::CANCEL_MEMORY_FULL;
-    }
-    state->num_fulfilled_requests++;
-  }
-  return ContinueBlobMemoryRequests(uuid, context);
-}
-
-void BlobAsyncBuilderHost::CancelBuildingBlob(const std::string& uuid,
-                                              IPCBlobCreationCancelCode code,
-                                              BlobStorageContext* context) {
-  DCHECK(context);
-  auto state_it = async_blob_map_.find(uuid);
-  if (state_it == async_blob_map_.end()) {
-    return;
-  }
-  // We can have the blob dereferenced by the renderer, but have it still being
-  // 'built'. In this case, it's destructed in the context, but we still have
-  // it in our map. Hence we make sure the context has the entry before
-  // calling cancel.
-  if (context->registry().HasEntry(uuid))
-    context->CancelPendingBlob(uuid, code);
-  async_blob_map_.erase(state_it);
-}
-
-void BlobAsyncBuilderHost::CancelAll(BlobStorageContext* context) {
-  DCHECK(context);
-  // If the blob still exists in the context (and is being built), then we know
-  // that someone else is expecting our blob, and we need to cancel it to let
-  // the dependency know it's gone.
-  std::vector<std::unique_ptr<BlobDataHandle>> referenced_pending_blobs;
-  for (const auto& uuid_state_pair : async_blob_map_) {
-    if (context->IsBeingBuilt(uuid_state_pair.first)) {
-      referenced_pending_blobs.emplace_back(
-          context->GetBlobDataFromUUID(uuid_state_pair.first));
-    }
-  }
-  // We clear the map before canceling them to prevent any strange reentry into
-  // our class (see ReferencedBlobFinished) if any blobs were waiting for others
-  // to construct.
-  async_blob_map_.clear();
-  for (const std::unique_ptr<BlobDataHandle>& handle :
-       referenced_pending_blobs) {
-    context->CancelPendingBlob(
-        handle->uuid(), IPCBlobCreationCancelCode::SOURCE_DIED_IN_TRANSIT);
-  }
-}
-
-BlobTransportResult BlobAsyncBuilderHost::ContinueBlobMemoryRequests(
-    const std::string& uuid,
-    BlobStorageContext* context) {
-  AsyncBlobMap::const_iterator state_it = async_blob_map_.find(uuid);
-  DCHECK(state_it != async_blob_map_.end());
-  BlobAsyncBuilderHost::BlobBuildingState* state = state_it->second.get();
-
-  BlobAsyncTransportRequestBuilder& request_builder = state->request_builder;
-  const std::vector<MemoryItemRequest>& requests = request_builder.requests();
-  size_t num_requests = requests.size();
-  if (state->num_fulfilled_requests == num_requests) {
-    FinishBuildingBlob(state, context);
-    return BlobTransportResult::DONE;
-  }
-  DCHECK_LT(state->num_fulfilled_requests, num_requests);
-  if (state->next_request == num_requests) {
-    // We are still waiting on other requests to come back.
-    return BlobTransportResult::PENDING_RESPONSES;
-  }
-
-  std::unique_ptr<std::vector<BlobItemBytesRequest>> byte_requests(
-      new std::vector<BlobItemBytesRequest>());
-  std::unique_ptr<std::vector<base::SharedMemoryHandle>> shared_memory(
-      new std::vector<base::SharedMemoryHandle>());
-
-  for (; state->next_request < num_requests; ++state->next_request) {
-    const MemoryItemRequest& request = requests[state->next_request];
-
-    bool stop_accumulating = false;
-    bool using_shared_memory_handle = state->num_shared_memory_requests > 0;
-    switch (request.message.transport_strategy) {
-      case IPCBlobItemRequestStrategy::IPC:
-        byte_requests->push_back(request.message);
-        break;
-      case IPCBlobItemRequestStrategy::SHARED_MEMORY:
-        if (using_shared_memory_handle &&
-            state->current_shared_memory_handle_index !=
-                request.message.handle_index) {
-          // We only want one shared memory per requesting blob.
-          stop_accumulating = true;
-          break;
-        }
-        using_shared_memory_handle = true;
-        state->current_shared_memory_handle_index =
-            request.message.handle_index;
-        state->num_shared_memory_requests++;
-
-        if (!state->shared_memory_block) {
-          state->shared_memory_block.reset(new base::SharedMemory());
-          size_t size =
-              request_builder
-                  .shared_memory_sizes()[request.message.handle_index];
-          if (!state->shared_memory_block->CreateAnonymous(size)) {
-            DVLOG(1) << "Unable to allocate shared memory for blob transfer.";
-            return BlobTransportResult::CANCEL_MEMORY_FULL;
-          }
-        }
-        shared_memory->push_back(state->shared_memory_block->handle());
-        byte_requests->push_back(request.message);
-        // Since we are only using one handle at a time, transform our handle
-        // index correctly back to 0.
-        byte_requests->back().handle_index = 0;
-        break;
-      case IPCBlobItemRequestStrategy::FILE:
-      case IPCBlobItemRequestStrategy::UNKNOWN:
-        NOTREACHED() << "Not implemented yet.";
-        break;
-    }
-    if (stop_accumulating) {
-      break;
-    }
-  }
-  DCHECK(!requests.empty());
-
-  state->request_memory_callback.Run(
-      std::move(byte_requests), std::move(shared_memory),
-      base::MakeUnique<std::vector<base::File>>());
-  return BlobTransportResult::PENDING_RESPONSES;
-}
-
-void BlobAsyncBuilderHost::ReferencedBlobFinished(
-    const std::string& owning_blob_uuid,
-    base::WeakPtr<BlobStorageContext> context,
-    bool construction_success,
-    IPCBlobCreationCancelCode reason) {
-  if (!context) {
-    return;
-  }
-  auto state_it = async_blob_map_.find(owning_blob_uuid);
-  if (state_it == async_blob_map_.end()) {
-    return;
-  }
-  if (!construction_success) {
-    CancelBuildingBlob(owning_blob_uuid,
-                       ConvertReferencedBlobErrorToConstructingError(reason),
-                       context.get());
-    return;
-  }
-  BlobBuildingState* state = state_it->second.get();
-  DCHECK_GT(state->num_referenced_blobs_building, 0u);
-  if (--state->num_referenced_blobs_building == 0) {
-    context->CompletePendingBlob(state->data_builder);
-    async_blob_map_.erase(state->data_builder.uuid());
-  }
-}
-
-void BlobAsyncBuilderHost::FinishBuildingBlob(BlobBuildingState* state,
-                                              BlobStorageContext* context) {
-  if (!state->referenced_blob_uuids.empty()) {
-    DCHECK_EQ(0u, state->num_referenced_blobs_building);
-    state->num_referenced_blobs_building = 0;
-    // We assume re-entry is not possible, as RunOnConstructionComplete
-    // will schedule a task when the blob is being built. Thus we can't have the
-    // case where |num_referenced_blobs_building| reaches 0 in the
-    // ReferencedBlobFinished method before we're finished looping.
-    for (const std::string& referenced_uuid : state->referenced_blob_uuids) {
-      if (context->IsBeingBuilt(referenced_uuid)) {
-        state->num_referenced_blobs_building++;
-        context->RunOnConstructionComplete(
-            referenced_uuid,
-            base::Bind(&BlobAsyncBuilderHost::ReferencedBlobFinished,
-                       ptr_factory_.GetWeakPtr(), state->data_builder.uuid(),
-                       context->AsWeakPtr()));
-      }
-    }
-    if (state->num_referenced_blobs_building > 0) {
-      // We wait until referenced blobs are done.
-      return;
-    }
-  }
-  context->CompletePendingBlob(state->data_builder);
-  async_blob_map_.erase(state->data_builder.uuid());
-}
-
-}  // namespace storage