| // Copyright 2014 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 "extensions/browser/value_store/value_store_frontend.h" |
| |
| #include <utility> |
| |
| #include "base/bind.h" |
| #include "base/files/file_path.h" |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "base/trace_event/trace_event.h" |
| #include "content/public/browser/browser_thread.h" |
| #include "extensions/browser/api/storage/backend_task_runner.h" |
| #include "extensions/browser/value_store/leveldb_value_store.h" |
| #include "extensions/browser/value_store/value_store_factory.h" |
| |
| using content::BrowserThread; |
| using extensions::ValueStoreFactory; |
| using extensions::IsOnBackendSequence; |
| using extensions::GetBackendTaskRunner; |
| |
| class ValueStoreFrontend::Backend : public base::RefCountedThreadSafe<Backend> { |
| public: |
| Backend(const scoped_refptr<ValueStoreFactory>& store_factory, |
| BackendType backend_type) |
| : store_factory_(store_factory), backend_type_(backend_type) {} |
| |
| void Get(const std::string& key, |
| const ValueStoreFrontend::ReadCallback& callback) { |
| DCHECK(IsOnBackendSequence()); |
| LazyInit(); |
| ValueStore::ReadResult result = storage_->Get(key); |
| |
| // Extract the value from the ReadResult and pass ownership of it to the |
| // callback. |
| std::unique_ptr<base::Value> value; |
| if (result->status().ok()) { |
| result->settings().RemoveWithoutPathExpansion(key, &value); |
| } else { |
| LOG(WARNING) << "Reading " << key << " from " << db_path_.value() |
| << " failed: " << result->status().message; |
| } |
| |
| BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::RunCallback, |
| this, callback, base::Passed(&value))); |
| } |
| |
| void Set(const std::string& key, std::unique_ptr<base::Value> value) { |
| DCHECK(IsOnBackendSequence()); |
| LazyInit(); |
| // We don't need the old value, so skip generating changes. |
| ValueStore::WriteResult result = storage_->Set( |
| ValueStore::IGNORE_QUOTA | ValueStore::NO_GENERATE_CHANGES, key, |
| *value); |
| LOG_IF(ERROR, !result->status().ok()) << "Error while writing " << key |
| << " to " << db_path_.value(); |
| } |
| |
| void Remove(const std::string& key) { |
| DCHECK(IsOnBackendSequence()); |
| LazyInit(); |
| storage_->Remove(key); |
| } |
| |
| private: |
| friend class base::RefCountedThreadSafe<Backend>; |
| |
| virtual ~Backend() { |
| if (storage_ && !IsOnBackendSequence()) |
| GetBackendTaskRunner()->DeleteSoon(FROM_HERE, storage_.release()); |
| } |
| |
| void LazyInit() { |
| DCHECK(IsOnBackendSequence()); |
| if (storage_) |
| return; |
| TRACE_EVENT0("ValueStoreFrontend::Backend", "LazyInit"); |
| switch (backend_type_) { |
| case BackendType::RULES: |
| storage_ = store_factory_->CreateRulesStore(); |
| break; |
| case BackendType::STATE: |
| storage_ = store_factory_->CreateStateStore(); |
| break; |
| } |
| } |
| |
| void RunCallback(const ValueStoreFrontend::ReadCallback& callback, |
| std::unique_ptr<base::Value> value) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| callback.Run(std::move(value)); |
| } |
| |
| // The factory which will be used to lazily create the ValueStore when needed. |
| // Used exclusively on the backend sequence. |
| scoped_refptr<ValueStoreFactory> store_factory_; |
| BackendType backend_type_; |
| |
| // The actual ValueStore that handles persisting the data to disk. Used |
| // exclusively on the backend sequence. |
| std::unique_ptr<ValueStore> storage_; |
| |
| base::FilePath db_path_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Backend); |
| }; |
| |
| ValueStoreFrontend::ValueStoreFrontend( |
| const scoped_refptr<ValueStoreFactory>& store_factory, |
| BackendType backend_type) |
| : backend_(new Backend(store_factory, backend_type)) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| } |
| |
| ValueStoreFrontend::~ValueStoreFrontend() { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| } |
| |
| void ValueStoreFrontend::Get(const std::string& key, |
| const ReadCallback& callback) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| |
| GetBackendTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::Get, backend_, key, callback)); |
| } |
| |
| void ValueStoreFrontend::Set(const std::string& key, |
| std::unique_ptr<base::Value> value) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| |
| GetBackendTaskRunner()->PostTask( |
| FROM_HERE, base::Bind(&ValueStoreFrontend::Backend::Set, backend_, key, |
| base::Passed(&value))); |
| } |
| |
| void ValueStoreFrontend::Remove(const std::string& key) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| |
| GetBackendTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::Remove, backend_, key)); |
| } |