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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/execution_service/cas_utils.hpp"
#include <fstream>
#include "fmt/core.h"
#include "src/buildtool/common/artifact_digest.hpp"
#include "src/buildtool/compatibility/native_support.hpp"
#include "src/buildtool/execution_api/execution_service/file_chunker.hpp"
#include "src/buildtool/file_system/file_system_manager.hpp"
#include "src/buildtool/file_system/git_repo.hpp"
#include "src/buildtool/file_system/object_type.hpp"
#include "src/buildtool/storage/fs_utils.hpp"
#include "src/utils/cpp/hex_string.hpp"
auto CASUtils::EnsureTreeInvariant(std::string const& data,
std::string const& hash,
Storage const& storage) noexcept
-> std::optional<std::string> {
auto entries = GitRepo::ReadTreeData(
data,
NativeSupport::Unprefix(hash),
[](auto const& /*unused*/) { return true; },
/*is_hex_id=*/true);
if (not entries) {
return fmt::format("could not read tree data {}", hash);
}
for (auto const& entry : *entries) {
for (auto const& item : entry.second) {
auto digest = static_cast<bazel_re::Digest>(
ArtifactDigest{ToHexString(entry.first),
/*size is unknown*/ 0,
IsTreeObject(item.type)});
if (not(IsTreeObject(item.type)
? storage.CAS().TreePath(digest)
: storage.CAS().BlobPath(digest, false))) {
return fmt::format(
"tree invariant violated {}: missing element {}",
hash,
digest.hash());
}
// The GitRepo::tree_entries_t data structure maps the object id to
// a list of entries of that object in possibly multiple trees. It
// is sufficient to check the existence of only one of these entries
// to be sure that the object is in CAS since they all have the same
// content.
break;
}
}
return std::nullopt;
}
auto CASUtils::SplitBlobIdentity(bazel_re::Digest const& blob_digest,
Storage const& storage) noexcept
-> std::variant<std::vector<bazel_re::Digest>, grpc::Status> {
// Check blob existence.
auto path = NativeSupport::IsTree(blob_digest.hash())
? storage.CAS().TreePath(blob_digest)
: storage.CAS().BlobPath(blob_digest, false);
if (not path) {
return grpc::Status{
grpc::StatusCode::NOT_FOUND,
fmt::format("blob not found {}", blob_digest.hash())};
}
// The split protocol states that each chunk that is returned by the
// operation is stored in (file) CAS. This means for the native mode, if we
// return the identity of a tree, we need to put the tree data in file CAS
// and return the resulting digest.
auto chunk_digests = std::vector<bazel_re::Digest>{};
if (NativeSupport::IsTree(blob_digest.hash())) {
auto tree_data = FileSystemManager::ReadFile(*path);
if (not tree_data) {
return grpc::Status{
grpc::StatusCode::INTERNAL,
fmt::format("could read tree data {}", blob_digest.hash())};
}
auto digest = storage.CAS().StoreBlob(*tree_data, false);
if (not digest) {
return grpc::Status{grpc::StatusCode::INTERNAL,
fmt::format("could not store tree as blob {}",
blob_digest.hash())};
}
chunk_digests.emplace_back(*digest);
return chunk_digests;
}
chunk_digests.emplace_back(blob_digest);
return chunk_digests;
}
auto CASUtils::SplitBlobFastCDC(bazel_re::Digest const& blob_digest,
Storage const& storage) noexcept
-> std::variant<std::vector<bazel_re::Digest>, grpc::Status> {
// Check blob existence.
auto path = NativeSupport::IsTree(blob_digest.hash())
? storage.CAS().TreePath(blob_digest)
: storage.CAS().BlobPath(blob_digest, false);
if (not path) {
return grpc::Status{
grpc::StatusCode::NOT_FOUND,
fmt::format("blob not found {}", blob_digest.hash())};
}
// Split blob into chunks, store each chunk in CAS, and collect chunk
// digests.
auto chunker = FileChunker{*path};
if (not chunker.IsOpen()) {
return grpc::Status{
grpc::StatusCode::INTERNAL,
fmt::format("could not open blob {}", blob_digest.hash())};
}
auto chunk_digests = std::vector<bazel_re::Digest>{};
while (auto chunk = chunker.NextChunk()) {
auto chunk_digest = storage.CAS().StoreBlob(*chunk, false);
if (not chunk_digest) {
return grpc::Status{grpc::StatusCode::INTERNAL,
fmt::format("could not store chunk of blob {}",
blob_digest.hash())};
}
chunk_digests.emplace_back(*chunk_digest);
}
if (not chunker.Finished()) {
return grpc::Status{
grpc::StatusCode::INTERNAL,
fmt::format("could not split blob {}", blob_digest.hash())};
}
return chunk_digests;
}
auto CASUtils::SpliceBlob(bazel_re::Digest const& blob_digest,
std::vector<bazel_re::Digest> const& chunk_digests,
Storage const& storage,
bool check_tree_invariant) noexcept
-> std::variant<bazel_re::Digest, grpc::Status> {
// Assemble blob from chunks.
auto tmp_dir = StorageUtils::CreateTypedTmpDir("splice");
auto tmp_file = tmp_dir->GetPath() / "blob";
{
std::ofstream tmp(tmp_file, std::ios::binary);
for (auto const& chunk_digest : chunk_digests) {
// Check chunk existence (only check file CAS).
auto path = storage.CAS().BlobPath(chunk_digest, false);
if (not path) {
return grpc::Status{
grpc::StatusCode::NOT_FOUND,
fmt::format("chunk not found {}", chunk_digest.hash())};
}
// Load chunk data.
auto chunk_data = FileSystemManager::ReadFile(*path);
if (not chunk_data) {
return grpc::Status{grpc::StatusCode::INTERNAL,
fmt::format("could read chunk data {}",
chunk_digest.hash())};
}
tmp << *chunk_data;
}
}
// Store resulting blob in according CAS.
auto const& hash = blob_digest.hash();
if (NativeSupport::IsTree(hash)) {
// In native mode: for trees, check whether the tree invariant holds
// before storing the actual tree object.
if (check_tree_invariant) {
auto tree_data = FileSystemManager::ReadFile(tmp_file);
if (not tree_data) {
return grpc::Status{
grpc::StatusCode::INTERNAL,
fmt::format("could read tree data {}", hash)};
}
if (auto err = EnsureTreeInvariant(*tree_data, hash, storage)) {
return grpc::Status{grpc::StatusCode::FAILED_PRECONDITION,
*err};
}
}
auto const& digest =
storage.CAS().StoreTree</* kOwner= */ true>(tmp_file);
if (not digest) {
return grpc::Status{grpc::StatusCode::INTERNAL,
fmt::format("could not store tree {}", hash)};
}
return *digest;
}
auto const& digest =
storage.CAS().StoreBlob</* kOwner= */ true>(tmp_file, false);
if (not digest) {
return grpc::Status{grpc::StatusCode::INTERNAL,
fmt::format("could not store blob {}", hash)};
}
return *digest;
}
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