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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_STREAM_DUMPER_HPP
#define INCLUDED_SRC_BUILDTOOL_EXECUTION_API_COMMON_STREAM_DUMPER_HPP
#include <cstdio>
#include <optional>
#include <string>
#include <utility>
#include "gsl/gsl"
#include "src/buildtool/common/artifact.hpp"
#include "src/buildtool/compatibility/compatibility.hpp"
#include "src/buildtool/execution_api/bazel_msg/bazel_msg_factory.hpp"
#include "src/buildtool/file_system/object_type.hpp"
template <typename TImpl>
class StreamDumper final {
public:
template <typename... Args>
explicit StreamDumper(Args&&... args) noexcept
: impl_(std::forward<Args>(args)...) {}
/// \brief Dump artifact to file stream.
/// Tree artifacts are pretty-printed (i.e., contents are listed) unless
/// raw_tree is set, then the raw tree will be written to the file stream.
/// \param info The object info of the artifact to dump.
/// \param stream The file stream to dump to.
/// \param raw_tree Dump tree as raw blob.
/// \returns true on success.
[[nodiscard]] auto DumpToStream(Artifact::ObjectInfo const& info,
gsl::not_null<FILE*> const& stream,
bool raw_tree) const noexcept -> bool {
const bool is_tree = IsTreeObject(info.type);
if (is_tree and raw_tree) {
return DumpRawTree(info, stream);
}
return is_tree ? DumpTree(info, stream) : DumpBlob(info, stream);
}
private:
TImpl impl_;
[[nodiscard]] auto DumpRawTree(
Artifact::ObjectInfo const& info,
gsl::not_null<FILE*> const& stream) const noexcept -> bool {
auto writer = [this, &stream](std::string const& data) -> bool {
return DumpString(data, stream);
};
return impl_.DumpRawTree(info, writer);
}
[[nodiscard]] auto DumpTree(
Artifact::ObjectInfo const& info,
gsl::not_null<FILE*> const& stream) const noexcept -> bool {
if (Compatibility::IsCompatible()) {
auto directory = impl_.ReadDirectory(info.digest);
auto data = directory
? BazelMsgFactory::DirectoryToString(*directory)
: std::nullopt;
if (data) {
return DumpString(*data, stream);
}
}
else {
auto entries = impl_.ReadGitTree(info.digest);
auto data = entries ? BazelMsgFactory::GitTreeToString(*entries)
: std::nullopt;
if (data) {
return DumpString(*data, stream);
}
}
return false;
}
[[nodiscard]] auto DumpBlob(
Artifact::ObjectInfo const& info,
gsl::not_null<FILE*> const& stream) const noexcept -> bool {
auto writer = [this, &stream](std::string const& data) -> bool {
return DumpString(data, stream);
};
return impl_.DumpBlob(info, writer);
}
[[nodiscard]] auto DumpString(
std::string const& data,
gsl::not_null<FILE*> const& stream) const noexcept -> bool {
return std::fwrite(data.data(), 1, data.size(), stream) == data.size();
}
};
#endif // INCLUDED_SRC_BUILDTOOL_EXECUTION_API_COMMON_STREAM_DUMPER_HPP
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