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#ifndef INCLUDED_SRC_BUILDTOOL_EXECUTION_API_REMOTE_BAZEL_BYTESTREAM_CLIENT_HPP
#define INCLUDED_SRC_BUILDTOOL_EXECUTION_API_REMOTE_BAZEL_BYTESTREAM_CLIENT_HPP
#include <algorithm>
#include <functional>
#include <iomanip>
#include <optional>
#include <string>
#include <vector>
#include "google/bytestream/bytestream.grpc.pb.h"
#include "src/buildtool/execution_api/remote/bazel/bazel_client_common.hpp"
#include "src/buildtool/logging/logger.hpp"
/// Implements client side for google.bytestream.ByteStream service.
class ByteStreamClient {
public:
class IncrementalReader {
friend class ByteStreamClient;
public:
/// \brief Read next chunk of data.
/// \returns empty string if stream finished and std::nullopt on error.
[[nodiscard]] auto Next() -> std::optional<std::string> {
google::bytestream::ReadResponse response{};
if (reader_->Read(&response)) {
return std::move(*response.mutable_data());
}
if (not finished_) {
auto status = reader_->Finish();
if (not status.ok()) {
LogStatus(logger_, LogLevel::Debug, status);
return std::nullopt;
}
finished_ = true;
}
return std::string{};
}
private:
Logger const* logger_;
grpc::ClientContext ctx_;
std::unique_ptr<grpc::ClientReader<google::bytestream::ReadResponse>>
reader_;
bool finished_{false};
IncrementalReader(
gsl::not_null<google::bytestream::ByteStream::Stub*> const& stub,
Logger const* logger,
std::string const& resource_name)
: logger_{logger} {
google::bytestream::ReadRequest request{};
request.set_resource_name(resource_name);
reader_ = stub->Read(&ctx_, request);
}
};
ByteStreamClient(std::string const& server,
Port port,
std::string const& user = "",
std::string const& pwd = "") noexcept {
stub_ = google::bytestream::ByteStream::NewStub(
CreateChannelWithCredentials(server, port, user, pwd));
}
[[nodiscard]] auto IncrementalRead(
std::string const& resource_name) const noexcept -> IncrementalReader {
return IncrementalReader{stub_.get(), &logger_, resource_name};
}
[[nodiscard]] auto Read(std::string const& resource_name) const noexcept
-> std::optional<std::string> {
auto reader = IncrementalRead(resource_name);
std::string output{};
auto data = reader.Next();
while (data and not data->empty()) {
output.append(data->begin(), data->end());
data = reader.Next();
}
if (not data) {
return std::nullopt;
}
return output;
}
[[nodiscard]] auto Write(std::string const& resource_name,
std::string const& data) const noexcept -> bool {
grpc::ClientContext ctx;
google::bytestream::WriteResponse response{};
auto writer = stub_->Write(&ctx, &response);
auto* allocated_data =
std::make_unique<std::string>(kChunkSize, '\0').release();
google::bytestream::WriteRequest request{};
request.set_resource_name(resource_name);
request.set_allocated_data(allocated_data);
std::size_t pos{};
do {
auto const size = std::min(data.size() - pos, kChunkSize);
allocated_data->resize(size);
data.copy(allocated_data->data(), size, pos);
request.set_write_offset(static_cast<int>(pos));
request.set_finish_write(pos + size >= data.size());
if (not writer->Write(request)) {
// According to the docs, quote:
// If there is an error or the connection is broken during the
// `Write()`, the client should check the status of the
// `Write()` by calling `QueryWriteStatus()` and continue
// writing from the returned `committed_size`.
auto const committed_size = QueryWriteStatus(resource_name);
if (committed_size <= 0) {
logger_.Emit(LogLevel::Debug,
"broken stream for upload to resource name {}",
resource_name);
return false;
}
pos = gsl::narrow<std::size_t>(committed_size);
}
else {
pos += kChunkSize;
}
} while (pos < data.size());
if (not writer->WritesDone()) {
logger_.Emit(LogLevel::Debug,
"broken stream for upload to resource name {}",
resource_name);
return false;
}
auto status = writer->Finish();
if (not status.ok()) {
LogStatus(&logger_, LogLevel::Debug, status);
return false;
}
return gsl::narrow<std::size_t>(response.committed_size()) ==
data.size();
}
template <class T_Input>
void ReadMany(
std::vector<T_Input> const& inputs,
std::function<std::string(T_Input const&)> const& to_resource_name,
std::function<void(std::string)> const& parse_data) const noexcept {
for (auto const& i : inputs) {
auto data = Read(to_resource_name(i));
if (data) {
parse_data(std::move(*data));
}
}
}
template <class T_Input>
[[nodiscard]] auto WriteMany(
std::vector<T_Input> const& inputs,
std::function<std::string(T_Input const&)> const& to_resource_name,
std::function<std::string(T_Input const&)> const& to_data)
const noexcept -> bool {
return std::all_of(inputs.begin(),
inputs.end(),
[this, &to_resource_name, &to_data](auto const& i) {
return Write(to_resource_name(i), to_data(i));
});
}
private:
// Chunk size for uploads (default size used by BuildBarn)
constexpr static std::size_t kChunkSize = 64 * 1024;
std::unique_ptr<google::bytestream::ByteStream::Stub> stub_;
Logger logger_{"ByteStreamClient"};
[[nodiscard]] auto QueryWriteStatus(
std::string const& resource_name) const noexcept -> std::int64_t {
grpc::ClientContext ctx;
google::bytestream::QueryWriteStatusRequest request{};
request.set_resource_name(resource_name);
google::bytestream::QueryWriteStatusResponse response{};
stub_->QueryWriteStatus(&ctx, request, &response);
return response.committed_size();
}
};
#endif // INCLUDED_SRC_BUILDTOOL_EXECUTION_API_REMOTE_BAZEL_BYTESTREAM_CLIENT_HPP
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