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// Copyright 2025 Huawei Cloud Computing Technology Co., Ltd.
//
// 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 INCLUDED_SRC_BUILDTOOL_COMMON_TREE_OVERLAY_HPP
#define INCLUDED_SRC_BUILDTOOL_COMMON_TREE_OVERLAY_HPP
#include <cstddef>
#include <functional>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "fmt/core.h"
#include "nlohmann/json.hpp"
#include "src/buildtool/common/action.hpp"
#include "src/buildtool/common/action_description.hpp"
#include "src/buildtool/common/artifact_description.hpp"
#include "src/buildtool/crypto/hash_function.hpp"
class TreeOverlay {
public:
using to_overlay_t = std::vector<ArtifactDescription>;
using Ptr = std::shared_ptr<TreeOverlay>;
explicit TreeOverlay(to_overlay_t const& trees, bool disjoint)
: id_{ComputeId(trees, disjoint)}, trees_{trees}, disjoint_{disjoint} {}
[[nodiscard]] auto Id() const& -> std::string const& { return id_; }
[[nodiscard]] auto Id() && -> std::string { return std::move(id_); }
[[nodiscard]] auto ToJson() const -> nlohmann::json {
return ComputeDescription(trees_, disjoint_);
}
[[nodiscard]] auto Inputs() const -> ActionDescription::inputs_t {
return AsInputs(trees_);
}
[[nodiscard]] auto Action() const -> ActionDescription {
return {{/*unused*/},
{/*unused*/},
Action::CreateTreeOverlayAction(id_, disjoint_),
AsInputs(trees_)};
}
[[nodiscard]] auto Output() const -> ArtifactDescription {
return ArtifactDescription::CreateTreeOverlay(id_);
}
[[nodiscard]] static auto FromJson(HashFunction::Type hash_type,
std::string const& id,
nlohmann::json const& json)
-> std::optional<TreeOverlay::Ptr> {
bool disjoint = json["disjoint"];
auto trees = to_overlay_t{};
for (auto const& entry : json["trees"]) {
auto artifact_desc =
ArtifactDescription::FromJson(hash_type, entry);
if (not artifact_desc) {
return std::nullopt;
}
trees.emplace_back(std::move(*artifact_desc));
}
return std::make_shared<TreeOverlay>(id, std::move(trees), disjoint);
}
TreeOverlay(std::string id, to_overlay_t&& trees, bool disjoint)
: id_{std::move(id)}, trees_{std::move(trees)}, disjoint_{disjoint} {}
private:
std::string id_;
to_overlay_t trees_;
bool disjoint_;
static auto ComputeDescription(to_overlay_t const& trees,
bool disjoint) -> nlohmann::json {
auto json = nlohmann::json::object();
auto tree_descs = nlohmann::json::array();
for (auto const& tree : trees) {
tree_descs.emplace_back(tree.ToJson());
}
json["trees"] = tree_descs;
json["disjoint"] = disjoint;
return json;
}
static auto ComputeId(to_overlay_t const& trees,
bool disjoint) -> std::string {
// The type of HashFunction is irrelevant here. It is used for
// identification of trees. SHA256 is used.
HashFunction const hash_function{HashFunction::Type::PlainSHA256};
return hash_function
.PlainHashData(fmt::format(
"TREE_OVERLAY:{}", ComputeDescription(trees, disjoint).dump()))
.HexString();
}
static auto AsInputs(to_overlay_t const& trees)
-> ActionDescription::inputs_t {
ActionDescription::inputs_t as_inputs{};
for (size_t i = 0; i < trees.size(); i++) {
as_inputs.emplace(fmt::format("{:010d}", i), trees[i]);
}
return as_inputs;
}
};
#endif
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