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// Copyright (c) 2012 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/browser/blob_storage/chrome_blob_storage_context.h"
#include <utility>
#include "base/bind.h"
#include "base/feature_list.h"
#include "base/files/file.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_util.h"
#include "base/guid.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/single_thread_task_runner.h"
#include "base/supports_user_data.h"
#include "base/task_runner.h"
#include "base/task_scheduler/post_task.h"
#include "content/browser/resource_context_impl.h"
#include "content/public/browser/blob_handle.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_features.h"
#include "content/public/common/resource_request_body.h"
#include "storage/browser/blob/blob_data_builder.h"
#include "storage/browser/blob/blob_memory_controller.h"
#include "storage/browser/blob/blob_storage_context.h"
using base::FilePath;
using base::UserDataAdapter;
using storage::BlobStorageContext;
namespace content {
namespace {
const FilePath::CharType kBlobStorageContextKeyName[] =
FILE_PATH_LITERAL("content_blob_storage_context");
const FilePath::CharType kBlobStorageParentDirectory[] =
FILE_PATH_LITERAL("blob_storage");
// Removes all folders in the parent directory except for the
// |current_run_dir| folder. If this path is empty, then we delete all folders.
void RemoveOldBlobStorageDirectories(FilePath blob_storage_parent,
const FilePath& current_run_dir) {
if (!base::DirectoryExists(blob_storage_parent)) {
return;
}
base::FileEnumerator enumerator(blob_storage_parent, false /* recursive */,
base::FileEnumerator::DIRECTORIES);
bool success = true;
bool cleanup_needed = false;
for (FilePath name = enumerator.Next(); !name.empty();
name = enumerator.Next()) {
cleanup_needed = true;
if (current_run_dir.empty() || name != current_run_dir)
success &= base::DeleteFile(name, true /* recursive */);
}
if (cleanup_needed)
UMA_HISTOGRAM_BOOLEAN("Storage.Blob.CleanupSuccess", success);
}
class BlobHandleImpl : public BlobHandle {
public:
explicit BlobHandleImpl(std::unique_ptr<storage::BlobDataHandle> handle)
: handle_(std::move(handle)) {}
~BlobHandleImpl() override {}
std::string GetUUID() override { return handle_->uuid(); }
private:
std::unique_ptr<storage::BlobDataHandle> handle_;
};
} // namespace
ChromeBlobStorageContext::ChromeBlobStorageContext() {}
ChromeBlobStorageContext* ChromeBlobStorageContext::GetFor(
BrowserContext* context) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!context->GetUserData(kBlobStorageContextKeyName)) {
scoped_refptr<ChromeBlobStorageContext> blob =
new ChromeBlobStorageContext();
context->SetUserData(
kBlobStorageContextKeyName,
base::MakeUnique<UserDataAdapter<ChromeBlobStorageContext>>(
blob.get()));
// Check first to avoid memory leak in unittests.
bool io_thread_valid = BrowserThread::IsMessageLoopValid(BrowserThread::IO);
// Resolve our storage directories.
FilePath blob_storage_parent =
context->GetPath().Append(kBlobStorageParentDirectory);
FilePath blob_storage_dir = blob_storage_parent.Append(
FilePath::FromUTF8Unsafe(base::GenerateGUID()));
// Only populate the task runner if we're not off the record. This enables
// paging/saving blob data to disk.
scoped_refptr<base::TaskRunner> file_task_runner;
// If we're not incognito mode, schedule all of our file tasks to enable
// disk on the storage context.
if (!context->IsOffTheRecord() && io_thread_valid) {
file_task_runner = base::CreateTaskRunnerWithTraits(
{base::MayBlock(), base::TaskPriority::BACKGROUND,
base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
// Removes our old blob directories if they exist.
BrowserThread::PostAfterStartupTask(
FROM_HERE, file_task_runner,
base::BindOnce(&RemoveOldBlobStorageDirectories,
base::Passed(&blob_storage_parent), blob_storage_dir));
}
if (io_thread_valid) {
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::BindOnce(&ChromeBlobStorageContext::InitializeOnIOThread, blob,
base::Passed(&blob_storage_dir),
base::Passed(&file_task_runner)));
}
}
return UserDataAdapter<ChromeBlobStorageContext>::Get(
context, kBlobStorageContextKeyName);
}
void ChromeBlobStorageContext::InitializeOnIOThread(
FilePath blob_storage_dir,
scoped_refptr<base::TaskRunner> file_task_runner) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
context_.reset(new BlobStorageContext(std::move(blob_storage_dir),
std::move(file_task_runner)));
// Signal the BlobMemoryController when it's appropriate to calculate its
// storage limits.
BrowserThread::PostAfterStartupTask(
FROM_HERE, BrowserThread::GetTaskRunnerForThread(BrowserThread::IO),
base::BindOnce(&storage::BlobMemoryController::CalculateBlobStorageLimits,
context_->mutable_memory_controller()->GetWeakPtr()));
}
std::unique_ptr<BlobHandle> ChromeBlobStorageContext::CreateMemoryBackedBlob(
const char* data,
size_t length) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
std::string uuid(base::GenerateGUID());
storage::BlobDataBuilder blob_data_builder(uuid);
blob_data_builder.AppendData(data, length);
std::unique_ptr<storage::BlobDataHandle> blob_data_handle =
context_->AddFinishedBlob(&blob_data_builder);
if (!blob_data_handle)
return std::unique_ptr<BlobHandle>();
std::unique_ptr<BlobHandle> blob_handle(
new BlobHandleImpl(std::move(blob_data_handle)));
return blob_handle;
}
std::unique_ptr<BlobHandle> ChromeBlobStorageContext::CreateFileBackedBlob(
const FilePath& path,
int64_t offset,
int64_t size,
const base::Time& expected_modification_time) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
std::string uuid(base::GenerateGUID());
storage::BlobDataBuilder blob_data_builder(uuid);
blob_data_builder.AppendFile(path, offset, size, expected_modification_time);
std::unique_ptr<storage::BlobDataHandle> blob_data_handle =
context_->AddFinishedBlob(&blob_data_builder);
if (!blob_data_handle)
return std::unique_ptr<BlobHandle>();
std::unique_ptr<BlobHandle> blob_handle(
new BlobHandleImpl(std::move(blob_data_handle)));
return blob_handle;
}
ChromeBlobStorageContext::~ChromeBlobStorageContext() {}
void ChromeBlobStorageContext::DeleteOnCorrectThread() const {
if (BrowserThread::IsMessageLoopValid(BrowserThread::IO) &&
!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, this);
return;
}
delete this;
}
storage::BlobStorageContext* GetBlobStorageContext(
ChromeBlobStorageContext* blob_storage_context) {
if (!blob_storage_context)
return NULL;
return blob_storage_context->context();
}
bool GetBodyBlobDataHandles(ResourceRequestBody* body,
ResourceContext* resource_context,
BlobHandles* blob_handles) {
blob_handles->clear();
storage::BlobStorageContext* blob_context = GetBlobStorageContext(
GetChromeBlobStorageContextForResourceContext(resource_context));
DCHECK(blob_context);
for (size_t i = 0; i < body->elements()->size(); ++i) {
const ResourceRequestBody::Element& element = (*body->elements())[i];
if (element.type() != ResourceRequestBody::Element::TYPE_BLOB)
continue;
std::unique_ptr<storage::BlobDataHandle> handle =
blob_context->GetBlobDataFromUUID(element.blob_uuid());
if (!handle)
return false;
blob_handles->push_back(std::move(handle));
}
return true;
}
} // namespace content
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