78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
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// Copyright (C) 2022 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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#pragma once
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#include <cstdint>
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#include <optional>
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#include <set>
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#include <string>
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#include "common/libs/utils/result.h"
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namespace cuttlefish {
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class InstanceNumsCalculator {
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public:
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InstanceNumsCalculator& FromFlags(const std::vector<std::string>&) &;
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InstanceNumsCalculator FromFlags(const std::vector<std::string>&) &&;
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InstanceNumsCalculator& FromGlobalGflags() &;
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InstanceNumsCalculator FromGlobalGflags() &&;
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InstanceNumsCalculator& BaseInstanceNum(std::int32_t) &;
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InstanceNumsCalculator BaseInstanceNum(std::int32_t) &&;
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InstanceNumsCalculator& NumInstances(std::int32_t) &;
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InstanceNumsCalculator NumInstances(std::int32_t) &&;
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InstanceNumsCalculator& InstanceNums(const std::string&) &;
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InstanceNumsCalculator InstanceNums(const std::string&) &&;
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// if any element is duplicated, only the first one of them is taken.
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// E.g. InstanceNums({1, 2, 3, 2}) == InstanceNums({1, 2, 3})
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// That is how the code was implemented in Android 14
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InstanceNumsCalculator& InstanceNums(std::vector<std::int32_t>) &;
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InstanceNumsCalculator InstanceNums(std::vector<std::int32_t>) &&;
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/**
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* Finds set of ids using the flags only.
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*
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* Especially, this calculates the base from --instance_nums and
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* --base_instance_num only
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*
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* Processes such as cvd clients may see different user accounts,
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* CUTTLEFISH_INSTANCE environment variable, etc, than the launcher
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* effectively sees. This util method is still helpful for that.
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*/
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Result<std::vector<std::int32_t>> CalculateFromFlags();
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// Calculates the base from the --instance_nums, --base_instance_num,
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// CUTTLEFISH_INSTANCE, suffix of the user account, and the default value.
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// Then, figures out the set if ids.
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Result<std::vector<std::int32_t>> Calculate();
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private:
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template <typename T>
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void TrySet(T& field, Result<T> result);
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Result<void> setter_result_;
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std::optional<std::int32_t> base_instance_num_;
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std::optional<std::int32_t> num_instances_;
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std::vector<std::int32_t> instance_nums_;
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};
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} // namespace cuttlefish
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