src/trace_processor/rpc/stdiod.cc

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * 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/trace_processor/rpc/stdiod.h"

#include <cstddef>
#include <cstdint>

#include "perfetto/base/build_config.h"
#include "perfetto/base/logging.h"
#include "perfetto/base/status.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/utils.h"
#include "src/trace_processor/rpc/rpc.h"

#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include <unistd.h>
#endif

#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) && !defined(STDIN_FILENO)
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#endif

namespace perfetto::trace_processor {

base::Status RunStdioRpcServer(Rpc& rpc) {
  constexpr size_t kReadSize = 4096;
  // stdin/stdout is a single pipe with a single peer, hence one stream.
  Rpc::Stream stream(rpc, [](const void* ptr, uint32_t size) {
    auto ret = base::WriteAll(STDOUT_FILENO, ptr, size);
    if (ret < 0 || static_cast<uint32_t>(ret) != size) {
      PERFETTO_FATAL("Failed to write response");
    }
  });
  for (;;) {
    Rpc::RequestHandle req = stream.BeginRequest(kReadSize);
    auto ret = base::Read(STDIN_FILENO, req.data(), req.size());
    if (ret <= 0) {
      req.AbortRequest();
      if (ret == -1)
        return base::ErrStatus("Failed while reading the buffer");
      return base::OkStatus();
    }
    req.EndRequest(static_cast<size_t>(ret));
  }
}

}  // namespace perfetto::trace_processor