You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
3.4 KiB
105 lines
3.4 KiB
// |
|
// Copyright (C) 2014 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_UPDATE_MANAGER_DEFAULT_POLICY_H_ |
|
#define UPDATE_ENGINE_UPDATE_MANAGER_DEFAULT_POLICY_H_ |
|
|
|
#include <memory> |
|
#include <string> |
|
|
|
#include <base/time/time.h> |
|
|
|
#include "update_engine/common/clock_interface.h" |
|
#include "update_engine/update_manager/policy.h" |
|
|
|
namespace chromeos_update_manager { |
|
|
|
// Auxiliary state class for DefaultPolicy evaluations. |
|
// |
|
// IMPORTANT: The use of a state object in policies is generally forbidden, as |
|
// it was a design decision to keep policy calls side-effect free. We make an |
|
// exception here to ensure that DefaultPolicy indeed serves as a safe (and |
|
// secure) fallback option. This practice should be avoided when imlpementing |
|
// other policies. |
|
class DefaultPolicyState { |
|
public: |
|
DefaultPolicyState() {} |
|
|
|
bool IsLastCheckAllowedTimeSet() const { |
|
return last_check_allowed_time_ != base::Time::Max(); |
|
} |
|
|
|
// Sets/returns the point time on the monotonic time scale when the latest |
|
// check allowed was recorded. |
|
void set_last_check_allowed_time(base::Time timestamp) { |
|
last_check_allowed_time_ = timestamp; |
|
} |
|
base::Time last_check_allowed_time() const { |
|
return last_check_allowed_time_; |
|
} |
|
|
|
private: |
|
base::Time last_check_allowed_time_ = base::Time::Max(); |
|
}; |
|
|
|
// The DefaultPolicy is a safe Policy implementation that doesn't fail. The |
|
// values returned by this policy are safe default in case of failure of the |
|
// actual policy being used by the UpdateManager. |
|
class DefaultPolicy : public Policy { |
|
public: |
|
explicit DefaultPolicy(chromeos_update_engine::ClockInterface* clock); |
|
DefaultPolicy() : DefaultPolicy(nullptr) {} |
|
~DefaultPolicy() override {} |
|
|
|
// Policy overrides. |
|
EvalStatus UpdateCheckAllowed( |
|
EvaluationContext* ec, State* state, std::string* error, |
|
UpdateCheckParams* result) const override; |
|
|
|
EvalStatus UpdateCanStart( |
|
EvaluationContext* ec, State* state, std::string* error, |
|
UpdateDownloadParams* result, |
|
UpdateState update_state) const override; |
|
|
|
EvalStatus UpdateDownloadAllowed( |
|
EvaluationContext* ec, State* state, std::string* error, |
|
bool* result) const override; |
|
|
|
EvalStatus P2PEnabled( |
|
EvaluationContext* ec, State* state, std::string* error, |
|
bool* result) const override; |
|
|
|
EvalStatus P2PEnabledChanged( |
|
EvaluationContext* ec, State* state, std::string* error, |
|
bool* result, bool prev_result) const override; |
|
|
|
protected: |
|
// Policy override. |
|
std::string PolicyName() const override { return "DefaultPolicy"; } |
|
|
|
private: |
|
// A clock interface. |
|
chromeos_update_engine::ClockInterface* clock_; |
|
|
|
// An auxiliary state object. |
|
std::unique_ptr<DefaultPolicyState> aux_state_; |
|
|
|
DISALLOW_COPY_AND_ASSIGN(DefaultPolicy); |
|
}; |
|
|
|
} // namespace chromeos_update_manager |
|
|
|
#endif // UPDATE_ENGINE_UPDATE_MANAGER_DEFAULT_POLICY_H_
|
|
|