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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.
#include "src/buildtool/execution_api/serve/mr_git_api.hpp"
#include <utility>
#include <variant>
#include "src/buildtool/execution_api/bazel_msg/bazel_msg_factory.hpp"
#include "src/buildtool/execution_api/git/git_api.hpp"
#include "src/buildtool/execution_api/utils/rehash_utils.hpp"
#include "src/buildtool/file_system/object_type.hpp"
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/logger.hpp"
#include "src/utils/cpp/expected.hpp"
MRGitApi::MRGitApi(
gsl::not_null<RepositoryConfig const*> const& repo_config,
gsl::not_null<StorageConfig const*> const& native_storage_config,
StorageConfig const* compatible_storage_config,
Storage const* compatible_storage,
IExecutionApi const* compatible_local_api) noexcept
: repo_config_{repo_config},
native_storage_config_{native_storage_config},
compat_storage_config_{compatible_storage_config},
compat_storage_{compatible_storage},
compat_local_api_{compatible_local_api} {}
auto MRGitApi::RetrieveToCas(
std::vector<Artifact::ObjectInfo> const& artifacts_info,
IExecutionApi const& api) const noexcept -> bool {
// Return immediately if target CAS is this CAS
if (this == &api) {
return true;
}
// in native mode: dispatch to regular GitApi
if (compat_storage_config_ == nullptr) {
GitApi const git_api{repo_config_};
return git_api.RetrieveToCas(artifacts_info, api);
}
// in compatible mode: set up needed callbacks for caching digest mappings
auto read_rehashed =
[native_sc = native_storage_config_,
compat_sc = compat_storage_config_](ArtifactDigest const& digest)
-> expected<std::optional<Artifact::ObjectInfo>, std::string> {
return RehashUtils::ReadRehashedDigest(
digest, *native_sc, *compat_sc, /*from_git=*/true);
};
auto store_rehashed =
[native_sc = native_storage_config_,
compat_sc = compat_storage_config_](
ArtifactDigest const& source_digest,
ArtifactDigest const& target_digest,
ObjectType obj_type) -> std::optional<std::string> {
return RehashUtils::StoreRehashedDigest(source_digest,
target_digest,
obj_type,
*native_sc,
*compat_sc,
/*from_git=*/true);
};
// collect the native blobs and rehash them as compatible to be able to
// check what is missing in the other api
std::vector<Artifact::ObjectInfo> compat_artifacts;
compat_artifacts.reserve(artifacts_info.size());
for (auto const& native_obj : artifacts_info) {
// check if we know already the compatible digest
auto cached_obj = read_rehashed(native_obj.digest);
if (not cached_obj) {
Logger::Log(
LogLevel::Error, "MRGitApi: {}", std::move(cached_obj).error());
return false;
}
if (*cached_obj) {
// add object to the vector of compatible artifacts
compat_artifacts.emplace_back(std::move(cached_obj)->value());
}
else {
// process object; trees need to be handled appropriately
if (IsTreeObject(native_obj.type)) {
// set up all the callbacks needed
auto read_git = [repo_config = repo_config_](
ArtifactDigest const& digest,
ObjectType /*type*/)
-> std::optional<
std::variant<std::filesystem::path, std::string>> {
return repo_config->ReadBlobFromGitCAS(digest.hash());
};
auto store_file =
[cas = &compat_storage_->CAS()](
std::variant<std::filesystem::path, std::string> const&
data,
bool is_exec) -> std::optional<ArtifactDigest> {
if (not std::holds_alternative<std::string>(data)) {
return std::nullopt;
}
return cas->StoreBlob(std::get<std::string>(data), is_exec);
};
BazelMsgFactory::TreeStoreFunc store_dir =
[cas = &compat_storage_->CAS()](std::string const& content)
-> std::optional<ArtifactDigest> {
return cas->StoreTree(content);
};
BazelMsgFactory::SymlinkStoreFunc store_symlink =
[cas = &compat_storage_->CAS()](std::string const& content)
-> std::optional<ArtifactDigest> {
return cas->StoreBlob(content);
};
// get the directory digest
auto tree_digest =
BazelMsgFactory::CreateDirectoryDigestFromGitTree(
native_obj.digest,
read_git,
store_file,
store_dir,
store_symlink,
read_rehashed,
store_rehashed);
if (not tree_digest) {
Logger::Log(LogLevel::Error,
"MRGitApi: {}",
std::move(tree_digest).error());
return false;
}
// add object to the vector of compatible artifacts
compat_artifacts.emplace_back(
Artifact::ObjectInfo{.digest = *std::move(tree_digest),
.type = ObjectType::Tree});
}
else {
// blobs are read from repo and added to compatible CAS
auto const blob_content =
repo_config_->ReadBlobFromGitCAS(native_obj.digest.hash());
if (not blob_content) {
Logger::Log(LogLevel::Error,
"MRGitApi: failed reading Git entry {}",
native_obj.digest.hash());
return false;
}
auto blob_digest = compat_storage_->CAS().StoreBlob(
*blob_content, IsExecutableObject(native_obj.type));
if (not blob_digest) {
Logger::Log(LogLevel::Error,
"MRGitApi: failed to rehash Git entry {}",
native_obj.digest.hash());
return false;
}
// cache the digest association
if (auto error_msg = store_rehashed(
native_obj.digest, *blob_digest, native_obj.type)) {
Logger::Log(
LogLevel::Error, "MRGitApi: {}", *std::move(error_msg));
return false;
}
// add object to the vector of compatible artifacts
compat_artifacts.emplace_back(
Artifact::ObjectInfo{.digest = *std::move(blob_digest),
.type = native_obj.type});
}
}
}
// now that we have gathered all the compatible object infos, simply pass
// them to a local api that can interact with the remote
return compat_local_api_->RetrieveToCas(compat_artifacts, api);
}
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