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188 lines
8.0 KiB
188 lines
8.0 KiB
//
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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_UPDATE_MANAGER_H_
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#define UPDATE_ENGINE_UPDATE_MANAGER_UPDATE_MANAGER_H_
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#include <memory>
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#include <set>
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#include <string>
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#include <base/callback.h>
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#include <base/time/time.h>
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#include "update_engine/common/system_state.h"
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#include "update_engine/update_manager/default_policy.h"
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#include "update_engine/update_manager/evaluation_context.h"
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#include "update_engine/update_manager/policy.h"
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#include "update_engine/update_manager/state.h"
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namespace chromeos_update_manager {
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// Please do not move this class into a new file for simplicity.
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// This pure virtual class is purely created for purpose of testing. The reason
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// was that |UpdateManager|'s member functions are templatized, which does not
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// play nicely when testing (mocking + faking). Whenever a specialized member of
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// |UpdateManager| must be tested, please add a specialized template member
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// function within this class for testing.
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class SpecializedPolicyRequestInterface {
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public:
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virtual ~SpecializedPolicyRequestInterface() = default;
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virtual void AsyncPolicyRequestUpdateCheckAllowed(
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base::Callback<void(EvalStatus, const UpdateCheckParams& result)>
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callback,
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EvalStatus (Policy::*policy_method)(EvaluationContext*,
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State*,
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std::string*,
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UpdateCheckParams*) const) = 0;
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};
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// The main Update Manager singleton class.
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class UpdateManager : public SpecializedPolicyRequestInterface {
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public:
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// Creates the UpdateManager instance, assuming ownership on the provided
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// |state|.
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UpdateManager(base::TimeDelta evaluation_timeout,
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base::TimeDelta expiration_timeout,
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State* state);
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virtual ~UpdateManager();
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// PolicyRequest() evaluates the given policy with the provided arguments and
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// returns the result. The |policy_method| is the pointer-to-method of the
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// Policy class for the policy request to call. The UpdateManager will call
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// this method on the right policy. The pointer |result| must not be null
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// and the remaining |args| depend on the arguments required by the passed
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// |policy_method|.
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//
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// When the policy request succeeds, the |result| is set and the method
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// returns EvalStatus::kSucceeded, otherwise, the |result| may not be set. A
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// policy called with this method should not block (i.e. return
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// EvalStatus::kAskMeAgainLater), which is considered a programming error. On
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// failure, EvalStatus::kFailed is returned.
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//
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// An example call to this method is:
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// um.PolicyRequest(&Policy::SomePolicyMethod, &bool_result, arg1, arg2);
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template <typename R, typename... ActualArgs, typename... ExpectedArgs>
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EvalStatus PolicyRequest(
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EvalStatus (Policy::*policy_method)(
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EvaluationContext*, State*, std::string*, R*, ExpectedArgs...) const,
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R* result,
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ActualArgs...);
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// Evaluates the given |policy_method| policy with the provided |args|
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// arguments and calls the |callback| callback with the result when done.
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//
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// If the policy implementation should block, returning a
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// EvalStatus::kAskMeAgainLater status the Update Manager will re-evaluate the
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// policy until another status is returned. If the policy implementation based
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// its return value solely on const variables, the callback will be called
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// with the EvalStatus::kAskMeAgainLater status (which indicates an error).
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template <typename R, typename... ActualArgs, typename... ExpectedArgs>
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void AsyncPolicyRequest(
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base::Callback<void(EvalStatus, const R& result)> callback,
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EvalStatus (Policy::*policy_method)(
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EvaluationContext*, State*, std::string*, R*, ExpectedArgs...) const,
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ActualArgs... args);
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void AsyncPolicyRequestUpdateCheckAllowed(
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base::Callback<void(EvalStatus, const UpdateCheckParams& result)>
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callback,
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EvalStatus (Policy::*policy_method)(EvaluationContext*,
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State*,
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std::string*,
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UpdateCheckParams*) const) override;
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protected:
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// The UpdateManager receives ownership of the passed Policy instance.
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void set_policy(const Policy* policy) { policy_.reset(policy); }
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// State getter used for testing.
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State* state() { return state_.get(); }
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private:
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FRIEND_TEST(UmUpdateManagerTest, PolicyRequestCallsPolicy);
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FRIEND_TEST(UmUpdateManagerTest, PolicyRequestCallsDefaultOnError);
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FRIEND_TEST(UmUpdateManagerTest, PolicyRequestDoesntBlockDeathTest);
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FRIEND_TEST(UmUpdateManagerTest, AsyncPolicyRequestDelaysEvaluation);
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FRIEND_TEST(UmUpdateManagerTest, AsyncPolicyRequestTimeoutDoesNotFire);
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FRIEND_TEST(UmUpdateManagerTest, AsyncPolicyRequestTimesOut);
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// EvaluatePolicy() evaluates the passed |policy_method| method on the current
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// policy with the given |args| arguments. If the method fails, the default
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// policy is used instead.
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template <typename R, typename... Args>
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EvalStatus EvaluatePolicy(
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EvaluationContext* ec,
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EvalStatus (Policy::*policy_method)(
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EvaluationContext*, State*, std::string*, R*, Args...) const,
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R* result,
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Args... args);
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// OnPolicyReadyToEvaluate() is called by the main loop when the evaluation
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// of the given |policy_method| should be executed. If the evaluation finishes
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// the |callback| callback is called passing the |result| and the |status|
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// returned by the policy. If the evaluation returns an
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// EvalStatus::kAskMeAgainLater state, the |callback| will NOT be called and
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// the evaluation will be re-scheduled to be called later.
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template <typename R, typename... Args>
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void OnPolicyReadyToEvaluate(
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std::shared_ptr<EvaluationContext> ec,
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base::Callback<void(EvalStatus status, const R& result)> callback,
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EvalStatus (Policy::*policy_method)(
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EvaluationContext*, State*, std::string*, R*, Args...) const,
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Args... args);
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// Unregisters (removes from repo) a previously created EvaluationContext.
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void UnregisterEvalContext(EvaluationContext* ec);
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// The policy used by the UpdateManager. Note that since it is a const Policy,
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// policy implementations are not allowed to persist state on this class.
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std::unique_ptr<const Policy> policy_;
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// A safe default value to the current policy. This policy is used whenever
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// a policy implementation fails with EvalStatus::kFailed.
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const DefaultPolicy default_policy_;
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// State Providers.
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std::unique_ptr<State> state_;
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// Timeout for a policy evaluation.
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const base::TimeDelta evaluation_timeout_;
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// Timeout for expiration of the evaluation context, used for async requests.
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const base::TimeDelta expiration_timeout_;
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// Repository of previously created EvaluationContext objects. These are being
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// unregistered (and the reference released) when the context is being
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// destructed; alternatively, when the UpdateManager instance is destroyed, it
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// will remove all pending events associated with all outstanding contexts
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// (which should, in turn, trigger their destruction).
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std::set<std::shared_ptr<EvaluationContext>> ec_repo_;
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base::WeakPtrFactory<UpdateManager> weak_ptr_factory_;
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DISALLOW_COPY_AND_ASSIGN(UpdateManager);
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};
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} // namespace chromeos_update_manager
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// Include the implementation of the template methods.
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#include "update_engine/update_manager/update_manager-inl.h"
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#endif // UPDATE_ENGINE_UPDATE_MANAGER_UPDATE_MANAGER_H_
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