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// Copyright 2024 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_EXECUTION_API_COMMON_TREE_READER_HPP
#define INCLUDED_SRC_BUILDTOOL_EXECUTION_API_COMMON_TREE_READER_HPP
#include <filesystem>
#include <functional>
#include <optional>
#include <utility>
#include <vector>
#include "src/buildtool/common/artifact.hpp"
#include "src/buildtool/common/bazel_types.hpp"
#include "src/buildtool/common/protocol_traits.hpp"
#include "src/buildtool/execution_api/common/tree_reader_utils.hpp"
#include "src/buildtool/file_system/git_repo.hpp"
#include "src/buildtool/file_system/object_type.hpp"
struct ReadTreeResult final {
std::vector<std::filesystem::path> paths;
std::vector<Artifact::ObjectInfo> infos;
};
template <typename TImpl>
class TreeReader final {
public:
template <typename... Args>
explicit TreeReader(Args&&... args) noexcept
: impl_(std::forward<Args>(args)...) {}
/// \brief Reads the flat content of a tree and returns object infos of all
/// its direct entries (trees and blobs).
/// \param tree_digest Digest of the tree.
/// \param parent Local parent path.
/// \returns A struct containing filesystem paths and object infos.
[[nodiscard]] auto ReadDirectTreeEntries(
ArtifactDigest const& digest,
std::filesystem::path const& parent) const noexcept
-> std::optional<ReadTreeResult> {
ReadTreeResult result;
TreeReaderUtils::InfoStoreFunc store_info =
[&result, &parent](std::filesystem::path const& path,
Artifact::ObjectInfo&& info) {
result.paths.emplace_back(parent / path);
result.infos.emplace_back(std::move(info));
return true;
};
if (not impl_.IsNativeProtocol()) {
auto tree = impl_.ReadDirectory(digest);
if (tree and
not TreeReaderUtils::ReadObjectInfos(*tree, store_info)) {
return std::nullopt;
}
}
else {
auto tree = impl_.ReadGitTree(digest);
if (tree and
not TreeReaderUtils::ReadObjectInfos(*tree, store_info)) {
return std::nullopt;
}
}
return result;
}
/// \brief Traverses a tree recursively and retrieves object infos of all
/// found blobs (leafs). Tree objects are by default not added to the result
/// list, but converted to a path name.
/// \param tree_digest Digest of the tree.
/// \param parent Local parent path.
/// \param include_trees Include leaf tree objects (empty trees).
/// \returns A struct containing filesystem paths and object infos.
[[nodiscard]] auto RecursivelyReadTreeLeafs(
ArtifactDigest const& digest,
std::filesystem::path const& parent,
bool include_trees = false) const noexcept
-> std::optional<ReadTreeResult> {
ReadTreeResult result;
auto store = [&result](std::filesystem::path const& path,
Artifact::ObjectInfo const& info) {
result.paths.emplace_back(path);
result.infos.emplace_back(info);
return true;
};
try {
if (ReadObjectInfosRecursively(
store, parent, digest, include_trees)) {
return result;
}
return std::nullopt;
} catch (...) {
return std::nullopt;
}
}
private:
TImpl impl_;
[[nodiscard]] static inline auto IsDirectoryEmpty(
bazel_re::Directory const& dir) noexcept -> bool {
return dir.files().empty() and dir.directories().empty() and
dir.symlinks().empty();
}
[[nodiscard]] auto ReadObjectInfosRecursively(
TreeReaderUtils::InfoStoreFunc const& store,
std::filesystem::path const& parent,
ArtifactDigest const& digest,
bool const include_trees) const -> bool {
TreeReaderUtils::InfoStoreFunc internal_store =
[this, &store, &parent, include_trees](
std::filesystem::path const& path,
Artifact::ObjectInfo&& info) -> bool {
return IsTreeObject(info.type)
? ReadObjectInfosRecursively(
store, parent / path, info.digest, include_trees)
: store(parent / path, std::move(info));
};
if (not impl_.IsNativeProtocol()) {
if (auto tree = impl_.ReadDirectory(digest)) {
if (include_trees and IsDirectoryEmpty(*tree)) {
if (not store(parent, {digest, ObjectType::Tree})) {
return false;
}
}
return TreeReaderUtils::ReadObjectInfos(*tree, internal_store);
}
}
else {
if (auto tree = impl_.ReadGitTree(digest)) {
if (include_trees and tree->empty()) {
if (not store(parent, {digest, ObjectType::Tree})) {
return false;
}
}
return TreeReaderUtils::ReadObjectInfos(*tree, internal_store);
}
}
return false;
}
};
#endif // INCLUDED_SRC_BUILDTOOL_EXECUTION_API_COMMON_TREE_READER_HPP
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