114 lines
4.1 KiB
C++
114 lines
4.1 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_POLICY_UTILS_H_
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#define UPDATE_ENGINE_UPDATE_MANAGER_POLICY_UTILS_H_
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#include <string>
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#include <vector>
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#include "update_engine/update_manager/policy.h"
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// Checks that the passed pointer value is not null, returning kFailed on the
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// current context and setting the *error description when it is null. The
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// intended use is to validate variable failures while using
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// EvaluationContext::GetValue, for example:
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//
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// const int* my_value = ec->GetValue(state->my_provider()->var_my_value());
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// POLICY_CHECK_VALUE_AND_FAIL(my_value, error);
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//
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#define POLICY_CHECK_VALUE_AND_FAIL(ptr, error) \
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do { \
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if ((ptr) == nullptr) { \
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*(error) = #ptr " is required but is null."; \
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return EvalStatus::kFailed; \
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} \
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} while (false)
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namespace chromeos_update_manager {
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// Call the passed-in Policy method on a series of Policy implementations, until
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// one of them renders a decision by returning a value other than
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// |EvalStatus::kContinue|.
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template <typename T, typename R, typename... Args>
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EvalStatus ConsultPolicies(const std::vector<Policy const*> policies,
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T policy_method,
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EvaluationContext* ec,
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State* state,
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std::string* error,
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R* result,
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Args... args) {
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for (auto policy : policies) {
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EvalStatus status =
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(policy->*policy_method)(ec, state, error, result, args...);
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if (status != EvalStatus::kContinue) {
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return status;
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}
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}
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return EvalStatus::kContinue;
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}
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// Base class implementation that returns |EvalStatus::kContinue| for all
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// decisions, to be used as a base-class for various Policy facets that only
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// pertain to certain situations. This might be better folded into Policy
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// instead of using pure-virtual methods on that class.
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class PolicyImplBase : public Policy {
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public:
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// Policy overrides.
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EvalStatus UpdateCheckAllowed(EvaluationContext* ec,
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State* state,
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std::string* error,
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UpdateCheckParams* result) const override {
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return EvalStatus::kContinue;
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};
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EvalStatus UpdateCanBeApplied(
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EvaluationContext* ec,
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State* state,
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std::string* error,
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chromeos_update_engine::ErrorCode* result,
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chromeos_update_engine::InstallPlan* install_plan) const override {
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return EvalStatus::kContinue;
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};
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EvalStatus UpdateCanStart(EvaluationContext* ec,
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State* state,
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std::string* error,
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UpdateDownloadParams* result,
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UpdateState update_state) const override {
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return EvalStatus::kContinue;
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};
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EvalStatus P2PEnabled(EvaluationContext* ec,
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State* state,
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std::string* error,
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bool* result) const override {
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return EvalStatus::kContinue;
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};
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EvalStatus P2PEnabledChanged(EvaluationContext* ec,
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State* state,
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std::string* error,
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bool* result,
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bool prev_result) const override {
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return EvalStatus::kContinue;
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};
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};
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} // namespace chromeos_update_manager
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#endif // UPDATE_ENGINE_UPDATE_MANAGER_POLICY_UTILS_H_
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