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// Copyright 2022 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_LOCAL_LOCAL_CAS_HPP
#define INCLUDED_SRC_BUILDTOOL_EXECUTION_API_LOCAL_LOCAL_CAS_HPP
#include <sstream>
#include <thread>
#include "src/buildtool/common/artifact.hpp"
#include "src/buildtool/execution_api/bazel_msg/bazel_blob.hpp"
#include "src/buildtool/execution_api/common/execution_common.hpp"
#include "src/buildtool/execution_api/local/config.hpp"
#include "src/buildtool/file_system/file_storage.hpp"
#include "src/buildtool/file_system/file_system_manager.hpp"
#include "src/buildtool/logging/logger.hpp"
#ifndef BOOTSTRAP_BUILD_TOOL
#include "src/buildtool/execution_api/local/garbage_collector.hpp"
#endif
template <ObjectType kType = ObjectType::File>
class LocalCAS {
public:
LocalCAS() noexcept = default;
LocalCAS(LocalCAS const&) = delete;
LocalCAS(LocalCAS&&) = delete;
auto operator=(LocalCAS const&) -> LocalCAS& = delete;
auto operator=(LocalCAS&&) -> LocalCAS& = delete;
~LocalCAS() noexcept = default;
[[nodiscard]] static auto Instance() noexcept -> LocalCAS<kType>& {
static auto instance = LocalCAS<kType>{};
return instance;
}
auto Reset() noexcept -> void {
file_store_ = FileStorage<kStorageType,
StoreMode::FirstWins,
/*kSetEpochTime=*/true>{
LocalExecutionConfig::CASDir<kType>(0)};
}
[[nodiscard]] auto StoreBlobFromBytes(std::string const& bytes)
const noexcept -> std::optional<bazel_re::Digest> {
return StoreBlob(bytes, /*is_owner=*/true);
}
[[nodiscard]] auto StoreBlobFromFile(std::filesystem::path const& file_path,
bool is_owner = false) const noexcept
-> std::optional<bazel_re::Digest> {
return StoreBlob(file_path, is_owner);
}
[[nodiscard]] auto BlobPath(bazel_re::Digest const& digest) const noexcept
-> std::optional<std::filesystem::path> {
auto id = NativeSupport::Unprefix(digest.hash());
auto blob_path = file_store_.GetPath(id);
#ifndef BOOTSTRAP_BUILD_TOOL
// Try to find blob in CAS generations and uplink if required.
auto found = FindAndUplinkBlob(id);
#else
auto found = FileSystemManager::IsFile(blob_path);
#endif
if (not found) {
logger_.Emit(LogLevel::Debug, "Blob not found {}", id);
return std::nullopt;
}
return blob_path;
}
private:
// For `Tree` the underlying storage type is non-executable file.
static constexpr auto kStorageType =
kType == ObjectType::Tree ? ObjectType::File : kType;
Logger logger_{std::string{"LocalCAS"} + ToChar(kType)};
FileStorage<kStorageType, StoreMode::FirstWins, /*kSetEpochTime=*/true>
file_store_{LocalExecutionConfig::CASDir<kType>(0)};
[[nodiscard]] static auto CreateDigest(std::string const& bytes) noexcept
-> std::optional<bazel_re::Digest> {
return ArtifactDigest::Create<kType>(bytes);
}
[[nodiscard]] static auto CreateDigest(
std::filesystem::path const& file_path) noexcept
-> std::optional<bazel_re::Digest> {
auto const bytes = FileSystemManager::ReadFile(file_path);
if (bytes.has_value()) {
return ArtifactDigest::Create<kType>(*bytes);
}
return std::nullopt;
}
/// \brief Store blob from bytes to storage.
[[nodiscard]] auto StoreBlobData(std::string const& blob_id,
std::string const& bytes,
bool /*unused*/) const noexcept -> bool {
return file_store_.AddFromBytes(blob_id, bytes);
}
/// \brief Store blob from file path to storage.
[[nodiscard]] auto StoreBlobData(std::string const& blob_id,
std::filesystem::path const& file_path,
bool is_owner) const noexcept -> bool {
return file_store_.AddFromFile(blob_id, file_path, is_owner);
}
/// \brief Store blob from unspecified data to storage.
template <class T>
[[nodiscard]] auto StoreBlob(T const& data, bool is_owner) const noexcept
-> std::optional<bazel_re::Digest> {
auto digest = CreateDigest(data);
if (digest) {
auto id = NativeSupport::Unprefix(digest->hash());
#ifndef BOOTSTRAP_BUILD_TOOL
if (FindAndUplinkBlob(id)) {
return digest;
}
#endif
if (StoreBlobData(id, data, is_owner)) {
return digest;
}
logger_.Emit(LogLevel::Debug, "Failed to store blob {}.", id);
}
logger_.Emit(LogLevel::Debug, "Failed to create digest.");
return std::nullopt;
}
#ifndef BOOTSTRAP_BUILD_TOOL
[[nodiscard]] auto FindAndUplinkBlob(std::string const& id) const noexcept
-> bool {
if (Compatibility::IsCompatible()) {
return GarbageCollector::FindAndUplinkBlob(
id, kType == ObjectType::Executable);
}
if (kType == ObjectType::Tree) {
return GarbageCollector::FindAndUplinkTree(id);
}
return GarbageCollector::FindAndUplinkBlob(
id, kType == ObjectType::Executable);
}
#endif
};
#endif // INCLUDED_SRC_BUILDTOOL_EXECUTION_API_LOCAL_LOCAL_CAS_HPP
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