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// Copyright 2023 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 "bytestream_server.hpp"
#include <cstddef>
#include <fstream>
#include <sstream>
#include <utility>
#include "fmt/core.h"
#include "src/buildtool/compatibility/native_support.hpp"
#include "src/buildtool/execution_api/common/bytestream_common.hpp"
#include "src/buildtool/execution_api/execution_service/cas_utils.hpp"
#include "src/buildtool/file_system/file_system_manager.hpp"
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/storage/garbage_collector.hpp"
#include "src/utils/cpp/tmp_dir.hpp"
#include "src/utils/cpp/verify_hash.hpp"
namespace {
auto ParseResourceName(std::string const& x) -> std::optional<std::string> {
// resource name is like this
// remote-execution/uploads/c4f03510-7d56-4490-8934-01bce1b1288e/blobs/62183d7a696acf7e69e218efc82c93135f8c85f895/4424712
if (auto end = x.rfind('/'); end != std::string::npos) {
if (auto start = x.rfind('/', end - 1); start != std::string::npos) {
return x.substr(start + 1, end - start - 1);
}
}
return std::nullopt;
}
} // namespace
auto BytestreamServiceImpl::Read(
::grpc::ServerContext* /*context*/,
const ::google::bytestream::ReadRequest* request,
::grpc::ServerWriter<::google::bytestream::ReadResponse>* writer)
-> ::grpc::Status {
logger_.Emit(LogLevel::Trace, "Read {}", request->resource_name());
// resource_name is of type
// remote-execution/blobs/62f408d64bca5de775c4b1dbc3288fc03afd6b19eb/0
auto hash = ParseResourceName(request->resource_name());
if (not hash) {
auto str = fmt::format("could not parse {}", request->resource_name());
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{::grpc::StatusCode::INVALID_ARGUMENT, str};
}
if (auto error_msg = IsAHash(*hash); error_msg) {
logger_.Emit(LogLevel::Debug, "{}", *error_msg);
return ::grpc::Status{::grpc::StatusCode::INVALID_ARGUMENT, *error_msg};
}
auto lock = GarbageCollector::SharedLock(storage_config_);
if (not lock) {
auto str = fmt::format("Could not acquire SharedLock");
logger_.Emit(LogLevel::Error, str);
return grpc::Status{grpc::StatusCode::INTERNAL, str};
}
std::optional<std::filesystem::path> path{};
if (NativeSupport::IsTree(*hash)) {
ArtifactDigest dgst{NativeSupport::Unprefix(*hash), 0, true};
path = storage_.CAS().TreePath(dgst);
}
else {
ArtifactDigest dgst{NativeSupport::Unprefix(*hash), 0, false};
path = storage_.CAS().BlobPath(dgst, false);
}
if (not path) {
auto str = fmt::format("could not find {}", *hash);
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{::grpc::StatusCode::NOT_FOUND, str};
}
std::ifstream stream{*path, std::ios::binary};
stream.seekg(request->read_offset(), std::ios::beg);
::google::bytestream::ReadResponse response;
std::string& buffer = *response.mutable_data();
buffer.resize(kChunkSize);
while (not stream.eof()) {
stream.read(buffer.data(), kChunkSize);
if (stream.bad()) {
auto const str = fmt::format("Failed to read data for {}", *hash);
logger_.Emit(LogLevel::Error, str);
return grpc::Status{grpc::StatusCode::INTERNAL, str};
}
if (stream.eof()) {
// do not send random bytes
buffer.resize(static_cast<std::size_t>(stream.gcount()));
}
writer->Write(response);
}
return ::grpc::Status::OK;
}
auto BytestreamServiceImpl::Write(
::grpc::ServerContext* /*context*/,
::grpc::ServerReader<::google::bytestream::WriteRequest>* reader,
::google::bytestream::WriteResponse* response) -> ::grpc::Status {
::google::bytestream::WriteRequest request;
reader->Read(&request);
logger_.Emit(LogLevel::Debug, "write {}", request.resource_name());
auto hash = ParseResourceName(request.resource_name());
if (not hash) {
auto str = fmt::format("could not parse {}", request.resource_name());
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{::grpc::StatusCode::INVALID_ARGUMENT, str};
}
if (auto error_msg = IsAHash(*hash); error_msg) {
logger_.Emit(LogLevel::Debug, "{}", *error_msg);
return ::grpc::Status{::grpc::StatusCode::INVALID_ARGUMENT, *error_msg};
}
logger_.Emit(LogLevel::Trace,
"Write: {}, offset {}, finish write {}",
*hash,
request.write_offset(),
request.finish_write());
auto lock = GarbageCollector::SharedLock(storage_config_);
if (not lock) {
auto str = fmt::format("Could not acquire SharedLock");
logger_.Emit(LogLevel::Error, str);
return grpc::Status{grpc::StatusCode::INTERNAL, str};
}
auto tmp_dir = storage_config_.CreateTypedTmpDir("execution-service");
if (not tmp_dir) {
return ::grpc::Status{::grpc::StatusCode::INTERNAL,
"could not create TmpDir"};
}
auto tmp = tmp_dir->GetPath() / *hash;
{
std::ofstream stream{tmp, std::ios::binary};
do {
if (not stream.good()) {
auto const str =
fmt::format("Failed to write data for {}", *hash);
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{::grpc::StatusCode::INTERNAL, str};
}
stream.write(request.data().data(),
static_cast<std::streamsize>(request.data().size()));
} while (not request.finish_write() and reader->Read(&request));
}
// Before storing a tree, we have to verify that its parts are present
bool const is_tree = NativeSupport::IsTree(*hash);
if (is_tree) {
// ... unfortunately, this requires us to read the whole tree object
// into memory
auto content = FileSystemManager::ReadFile(tmp);
if (not content) {
auto const msg = fmt::format(
"Failed to read temporary file {} for {}", tmp.string(), *hash);
logger_.Emit(LogLevel::Error, "{}", msg);
return ::grpc::Status{::grpc::StatusCode::INTERNAL, msg};
}
ArtifactDigest dgst{NativeSupport::Unprefix(*hash), 0, true};
if (auto err =
CASUtils::EnsureTreeInvariant(dgst, *content, storage_)) {
auto const str = fmt::format("Write: {}", *std::move(err));
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{grpc::StatusCode::FAILED_PRECONDITION, str};
}
}
// Store blob and verify hash
auto const stored = is_tree ? storage_.CAS().StoreTree</*kOwner=*/true>(tmp)
: storage_.CAS().StoreBlob</*kOwner=*/true>(
tmp, /*is_executable=*/false);
if (not stored) {
// This is a serious problem: we have a sequence of bytes, but cannot
// write them to CAS.
auto str = fmt::format("Failed to store object {}", *hash);
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{::grpc::StatusCode::INTERNAL, str};
}
if (static_cast<bazel_re::Digest>(*stored).hash() != *hash) {
// User error: did not get a file with the announced hash
auto str = fmt::format("In upload for {} received object with hash {}",
*hash,
stored->hash());
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{::grpc::StatusCode::INVALID_ARGUMENT, str};
}
response->set_committed_size(
static_cast<google::protobuf::int64>(std::filesystem::file_size(tmp)));
return ::grpc::Status::OK;
}
auto BytestreamServiceImpl::QueryWriteStatus(
::grpc::ServerContext* /*context*/,
const ::google::bytestream::QueryWriteStatusRequest* /*request*/,
::google::bytestream::QueryWriteStatusResponse* /*response*/)
-> ::grpc::Status {
auto const* str = "QueryWriteStatus not implemented";
logger_.Emit(LogLevel::Error, "{}", str);
return ::grpc::Status{grpc::StatusCode::UNIMPLEMENTED, str};
}
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