105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
//
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// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef UPDATE_ENGINE_UPDATE_MANAGER_DEFAULT_POLICY_H_
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#define UPDATE_ENGINE_UPDATE_MANAGER_DEFAULT_POLICY_H_
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#include <memory>
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#include <string>
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#include <base/time/time.h>
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#include "update_engine/common/clock_interface.h"
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#include "update_engine/update_manager/policy.h"
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namespace chromeos_update_manager {
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// Auxiliary state class for DefaultPolicy evaluations.
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//
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// IMPORTANT: The use of a state object in policies is generally forbidden, as
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// it was a design decision to keep policy calls side-effect free. We make an
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// exception here to ensure that DefaultPolicy indeed serves as a safe (and
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// secure) fallback option. This practice should be avoided when imlpementing
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// other policies.
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class DefaultPolicyState {
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public:
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DefaultPolicyState() {}
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bool IsLastCheckAllowedTimeSet() const {
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return last_check_allowed_time_ != base::Time::Max();
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}
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// Sets/returns the point time on the monotonic time scale when the latest
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// check allowed was recorded.
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void set_last_check_allowed_time(base::Time timestamp) {
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last_check_allowed_time_ = timestamp;
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}
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base::Time last_check_allowed_time() const {
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return last_check_allowed_time_;
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}
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private:
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base::Time last_check_allowed_time_ = base::Time::Max();
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};
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// The DefaultPolicy is a safe Policy implementation that doesn't fail. The
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// values returned by this policy are safe default in case of failure of the
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// actual policy being used by the UpdateManager.
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class DefaultPolicy : public Policy {
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public:
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explicit DefaultPolicy(chromeos_update_engine::ClockInterface* clock);
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DefaultPolicy() : DefaultPolicy(nullptr) {}
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~DefaultPolicy() override {}
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// Policy overrides.
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EvalStatus UpdateCheckAllowed(
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EvaluationContext* ec, State* state, std::string* error,
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UpdateCheckParams* result) const override;
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EvalStatus UpdateCanStart(
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EvaluationContext* ec, State* state, std::string* error,
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UpdateDownloadParams* result,
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UpdateState update_state) const override;
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EvalStatus UpdateDownloadAllowed(
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EvaluationContext* ec, State* state, std::string* error,
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bool* result) const override;
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EvalStatus P2PEnabled(
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EvaluationContext* ec, State* state, std::string* error,
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bool* result) const override;
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EvalStatus P2PEnabledChanged(
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EvaluationContext* ec, State* state, std::string* error,
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bool* result, bool prev_result) const override;
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protected:
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// Policy override.
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std::string PolicyName() const override { return "DefaultPolicy"; }
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private:
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// A clock interface.
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chromeos_update_engine::ClockInterface* clock_;
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// An auxiliary state object.
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std::unique_ptr<DefaultPolicyState> aux_state_;
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DISALLOW_COPY_AND_ASSIGN(DefaultPolicy);
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};
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} // namespace chromeos_update_manager
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#endif // UPDATE_ENGINE_UPDATE_MANAGER_DEFAULT_POLICY_H_
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