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// 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.
#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
#include <map>
#include <string>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/extensions/install_gate.h"
#include "chrome/browser/extensions/install_observer.h"
#include "components/keyed_service/core/keyed_service.h"
namespace content {
class BrowserContext;
}
namespace extensions {
// The class responsible for cleaning up the cruft left behind on the file
// system by uninstalled (or failed install) extensions.
// The class is owned by ExtensionService, but is mostly independent. Tasks to
// garbage collect extensions and isolated storage are posted once the
// ExtensionSystem signals ready.
class ExtensionGarbageCollector : public KeyedService,
public InstallObserver,
public InstallGate {
public:
explicit ExtensionGarbageCollector(content::BrowserContext* context);
~ExtensionGarbageCollector() override;
static ExtensionGarbageCollector* Get(content::BrowserContext* context);
// Manually trigger GarbageCollectExtensions() for testing.
void GarbageCollectExtensionsForTest();
// KeyedService:
void Shutdown() override;
// InstallObserver:
void OnBeginCrxInstall(const std::string& extension_id) override;
void OnFinishCrxInstall(const std::string& extension_id,
bool success) override;
// InstallGate:
Action ShouldDelay(const Extension* extension,
bool install_immediately) override;
protected:
// Cleans up the extension install directory. It can end up with garbage in it
// if extensions can't initially be removed when they are uninstalled (eg if a
// file is in use).
// Obsolete version directories are removed, as are directories that aren't
// found in the ExtensionPrefs.
// The "Temp" directory that is used during extension installation will get
// removed iff there are no pending installations.
virtual void GarbageCollectExtensions();
// Garbage collects apps/extensions isolated storage if it is uninstalled.
// There is an exception for ephemeral apps because they can outlive their
// cache lifetimes.
void GarbageCollectIsolatedStorageIfNeeded();
// Restart any extension installs which were delayed for isolated storage
// garbage collection.
void OnGarbageCollectIsolatedStorageFinished();
static void GarbageCollectExtensionsOnFileThread(
const base::FilePath& install_directory,
const std::multimap<std::string, base::FilePath>& extension_paths);
// The BrowserContext associated with the GarbageCollector.
content::BrowserContext* context_;
// The number of currently ongoing CRX installations. This is used to prevent
// garbage collection from running while a CRX is being installed.
int crx_installs_in_progress_;
// Set to true to delay all new extension installations. Acts as a lock to
// allow background processing of garbage collection of on-disk state without
// needing to worry about race conditions caused by extension installation and
// reinstallation.
bool installs_delayed_for_gc_ = false;
// Generate weak pointers for safely posting to the file thread for garbage
// collection.
base::WeakPtrFactory<ExtensionGarbageCollector> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ExtensionGarbageCollector);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
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