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//
// Copyright (C) 2012 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef UPDATE_ENGINE_PAYLOAD_STATE_INTERFACE_H_
#define UPDATE_ENGINE_PAYLOAD_STATE_INTERFACE_H_
#include <string>
#include "update_engine/common/action_processor.h"
#include "update_engine/common/constants.h"
#include "update_engine/omaha_response.h"
namespace chromeos_update_engine {
// Describes the methods that need to be implemented by the PayloadState class.
// This interface has been carved out to support mocking of the PayloadState
// object.
class PayloadStateInterface {
public:
virtual ~PayloadStateInterface() = default;
// Sets the internal payload state based on the given Omaha response. This
// response could be the same or different from the one for which we've stored
// the internal state. If it's different, then this method resets all the
// internal state corresponding to the old response. Since the Omaha response
// has a lot of fields that are not related to payload state, it uses only
// a subset of the fields in the Omaha response to compare equality.
virtual void SetResponse(const OmahaResponse& response) = 0;
// This method should be called whenever we have completed downloading all
// the bytes of a payload and have verified that its size and hash match the
// expected values. We use this notificaiton to increment the payload attempt
// number so that the throttle the next attempt to download the same payload
// (in case there's an error in subsequent steps such as post-install)
// appropriately.
virtual void DownloadComplete() = 0;
// This method should be called whenever we receive new bytes from the
// network for the current payload. We use this notification to reset the
// failure count for a given URL since receipt of some bytes means we are
// able to make forward progress with the current URL.
virtual void DownloadProgress(size_t count) = 0;
// This method should be called every time we resume an update attempt.
virtual void UpdateResumed() = 0;
// This method should be called every time we begin a new update. This method
// should not be called when we resume an update from the previously
// downloaded point. This is used to reset the metrics for each new update.
virtual void UpdateRestarted() = 0;
// This method should be called once after an update attempt succeeds. This
// is when the relevant UMA metrics that are tracked on a per-update-basis
// are uploaded to the UMA server.
virtual void UpdateSucceeded() = 0;
// This method should be called whenever an update attempt fails with the
// given error code. We use this notification to update the payload state
// depending on the type of the error that happened.
virtual void UpdateFailed(ErrorCode error) = 0;
// This method should be called whenever a succeeded update is canceled, and
// thus can only be called after UpdateSucceeded(). This is currently used
// only for manual testing using the update_engine_client.
virtual void ResetUpdateStatus() = 0;
// This method should be called every time we initiate a Rollback.
virtual void Rollback() = 0;
// Sets the expectations to boot into the new version in the next reboot.
// This function is called every time a new update is marked as ready by
// UpdateSuccess(). |target_version_uid| is an unique identifier of the
// applied payload. It can be any string, as long as the same string is used
// for the same payload.
virtual void ExpectRebootInNewVersion(
const std::string& target_version_uid) = 0;
// Sets whether P2P is being used to download the update payload. This
// is used to keep track of download sources being used and should be called
// before the transfer begins.
virtual void SetUsingP2PForDownloading(bool value) = 0;
// Sets whether P2P is being used for sharing the update payloads.
virtual void SetUsingP2PForSharing(bool value) = 0;
// Returns true if we should backoff the current download attempt.
// False otherwise.
virtual bool ShouldBackoffDownload() = 0;
// Returns the currently stored response "signature". The signature is a
// subset of fields that are of interest to the PayloadState behavior.
virtual std::string GetResponseSignature() = 0;
// Returns the payload attempt number.
virtual int GetPayloadAttemptNumber() = 0;
// Returns the payload attempt number of the attempted full payload. Returns
// 0 for delta payloads.
virtual int GetFullPayloadAttemptNumber() = 0;
// Returns the current URL. Returns an empty string if there's no valid URL.
virtual std::string GetCurrentUrl() = 0;
// Returns the current URL's failure count.
virtual uint32_t GetUrlFailureCount() = 0;
// Returns the total number of times a new URL has been switched to
// for the current response.
virtual uint32_t GetUrlSwitchCount() = 0;
// Returns the total number of different responses seen since the
// last successful update.
virtual int GetNumResponsesSeen() = 0;
// Returns the expiry time for the current backoff period.
virtual base::Time GetBackoffExpiryTime() = 0;
// Returns the elapsed time used for this update, including time
// where the device is powered off and sleeping. If the
// update has not completed, returns the time spent so far.
virtual base::TimeDelta GetUpdateDuration() = 0;
// Returns the time used for this update not including time when
// the device is powered off or sleeping. If the update has not
// completed, returns the time spent so far.
virtual base::TimeDelta GetUpdateDurationUptime() = 0;
// Returns the number of bytes that have been downloaded for each source for
// each new update attempt. If we resume an update, we'll continue from the
// previous value, but if we get a new response or if the previous attempt
// failed, we'll reset this to 0 to start afresh.
virtual uint64_t GetCurrentBytesDownloaded(DownloadSource source) = 0;
// Returns the total number of bytes that have been downloaded for each
// source since the the last successful update. This is used to compute the
// overhead we incur.
virtual uint64_t GetTotalBytesDownloaded(DownloadSource source) = 0;
// Returns the reboot count for this update attempt.
virtual uint32_t GetNumReboots() = 0;
// Called at update_engine startup to do various house-keeping.
virtual void UpdateEngineStarted() = 0;
// Returns the version from before a rollback if our last update was a
// rollback.
virtual std::string GetRollbackVersion() = 0;
// Returns the value of number of attempts we've attempted to
// download the payload via p2p.
virtual int GetP2PNumAttempts() = 0;
// Returns the value of timestamp of the first time we've attempted
// to download the payload via p2p.
virtual base::Time GetP2PFirstAttemptTimestamp() = 0;
// Should be called every time we decide to use p2p for an update
// attempt. This is used to increase the p2p attempt counter and
// set the timestamp for first attempt.
virtual void P2PNewAttempt() = 0;
// Returns |true| if we are allowed to continue using p2p for
// downloading and |false| otherwise. This is done by recording
// and examining how many attempts have been done already as well
// as when the first attempt was.
virtual bool P2PAttemptAllowed() = 0;
// Gets the values previously set with SetUsingP2PForDownloading() and
// SetUsingP2PForSharing().
virtual bool GetUsingP2PForDownloading() const = 0;
virtual bool GetUsingP2PForSharing() const = 0;
// Returns the current (persisted) scattering wallclock-based wait period.
virtual base::TimeDelta GetScatteringWaitPeriod() = 0;
// Sets and persists the scattering wallclock-based wait period.
virtual void SetScatteringWaitPeriod(base::TimeDelta wait_period) = 0;
// Sets/gets the P2P download URL, if one is to be used.
virtual void SetP2PUrl(const std::string& url) = 0;
virtual std::string GetP2PUrl() const = 0;
};
} // namespace chromeos_update_engine
#endif // UPDATE_ENGINE_PAYLOAD_STATE_INTERFACE_H_