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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 COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
#define COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
#include <stdint.h>
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/version.h"
#include "components/update_client/update_client.h"
#include "url/gurl.h"
class ComponentsUI;
class SupervisedUserWhitelistService;
namespace base {
class DictionaryValue;
class FilePath;
class SequencedTaskRunner;
}
namespace content {
class ResourceThrottle;
}
namespace net {
class URLRequestContextGetter;
class URLRequest;
}
namespace update_client {
class ComponentInstaller;
class Configurator;
struct CrxComponent;
struct CrxUpdateItem;
}
namespace component_updater {
class OnDemandUpdater;
using Configurator = update_client::Configurator;
using CrxComponent = update_client::CrxComponent;
using CrxUpdateItem = update_client::CrxUpdateItem;
// The component update service is in charge of installing or upgrading
// select parts of chrome. Each part is called a component and managed by
// instances of CrxComponent registered using RegisterComponent(). On the
// server, each component is packaged as a CRX which is the same format used
// to package extensions. To the update service each component is identified
// by its public key hash (CrxComponent::pk_hash). If there is an update
// available and its version is bigger than (CrxComponent::version), it will
// be downloaded, verified and unpacked. Then component-specific installer
// ComponentInstaller::Install (of CrxComponent::installer) will be called.
//
// During the normal operation of the component updater some specific
// notifications are fired, like COMPONENT_UPDATER_STARTED and
// COMPONENT_UPDATE_FOUND. See notification_type.h for more details.
//
// All methods are safe to call ONLY from the browser's main thread.
class ComponentUpdateService {
public:
using Observer = update_client::UpdateClient::Observer;
// Adds an observer for this class. An observer should not be added more
// than once. The caller retains the ownership of the observer object.
virtual void AddObserver(Observer* observer) = 0;
// Removes an observer. It is safe for an observer to be removed while
// the observers are being notified.
virtual void RemoveObserver(Observer* observer) = 0;
// Add component to be checked for updates.
virtual bool RegisterComponent(const CrxComponent& component) = 0;
// Unregisters the component with the given ID. This means that the component
// is not going to be included in future update checks. If a download or
// update operation for the component is currently in progress, it will
// silently finish without triggering the next step.
// Note that the installer for the component is responsible for removing any
// existing versions of the component from disk. Returns true if the
// uninstall has completed successfully and the component files have been
// removed, or if the uninstalled has been deferred because the component
// is being updated. Returns false if the component id is not known or the
/// uninstall encountered an error.
virtual bool UnregisterComponent(const std::string& id) = 0;
// Returns a list of registered components.
virtual std::vector<std::string> GetComponentIDs() const = 0;
// Returns an interface for on-demand updates. On-demand updates are
// proactively triggered outside the normal component update service schedule.
virtual OnDemandUpdater& GetOnDemandUpdater() = 0;
// This method is used to trigger an on-demand update for component |id|.
// This can be used when loading a resource that depends on this component.
//
// |callback| is called on the main thread once the on-demand update is
// complete, regardless of success. |callback| may be called immediately
// within the method body.
//
// Additionally, this function implements an embedder-defined cooldown
// interval between on demand update attempts. This behavior is intended
// to be defensive against programming bugs, usually triggered by web fetches,
// where the on-demand functionality is invoked too often. If this function
// is called while still on cooldown, |callback| will be called immediately.
virtual void MaybeThrottle(const std::string& id,
const base::Closure& callback) = 0;
// Returns a task runner suitable for use by component installers.
virtual scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner() = 0;
virtual ~ComponentUpdateService() {}
private:
// Returns details about registered component in the |item| parameter. The
// function returns true in case of success and false in case of errors.
virtual bool GetComponentDetails(const std::string& id,
CrxUpdateItem* item) const = 0;
friend class ::ComponentsUI;
};
using ServiceObserver = ComponentUpdateService::Observer;
class OnDemandUpdater {
public:
virtual ~OnDemandUpdater() {}
private:
friend class OnDemandTester;
friend class SupervisedUserWhitelistInstaller;
friend class ::ComponentsUI;
// Triggers an update check for a component. |id| is a value
// returned by GetCrxComponentID(). If an update for this component is already
// in progress, the function returns |kInProgress|. If an update is available,
// the update will be applied. The caller can subscribe to component update
// service notifications to get an indication about the outcome of the
// on-demand update. The function does not implement any cooldown interval.
// TODO(sorin): improve this API so that the result of this non-blocking
// call is provided by a callback.
virtual bool OnDemandUpdate(const std::string& id) = 0;
};
// Creates the component updater.
scoped_ptr<ComponentUpdateService> ComponentUpdateServiceFactory(
const scoped_refptr<Configurator>& config);
} // namespace component_updater
#endif // COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
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