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// Copyright (C) 2019 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 "common/debug.h"
#include "common/loggers.h"
#include "prefetcher/prefetcher_daemon.h"
#include <android-base/parseint.h>
#include <android-base/logging.h>
#include <iostream>
#include <optional>
#include <string_view>
#include <string>
#include <vector>
#include <signal.h>
#if defined(IORAP_PREFETCHER_MAIN)
namespace iorap::prefetcher {
void Usage(char** argv) {
std::cerr << "Usage: " << argv[0] << " [--input-fd=#] [--output-fd=#]" << std::endl;
std::cerr << "" << std::endl;
std::cerr << " Run the readahead daemon which can prefetch files given a command." << std::endl;
std::cerr << "" << std::endl;
std::cerr << " Optional flags:" << std::endl;
std::cerr << " --help,-h Print this Usage." << std::endl;
std::cerr << " --input-fd,-if Input FD (default stdin)." << std::endl;
std::cerr << " --output-fd,-of Output FD (default stdout)." << std::endl;
std::cerr << " --use-sockets,-us Use AF_UNIX sockets (default off)." << std::endl;
std::cerr << " --command-format=[text|binary],-cf (default text)." << std::endl;
std::cerr << " --verbose,-v Set verbosity (default off)." << std::endl;
std::cerr << " --wait,-w Wait for key stroke before continuing (default off)." << std::endl;
exit(1);
}
int Main(int argc, char** argv) {
// Go to system logcat + stderr when running from command line.
android::base::InitLogging(argv, iorap::common::StderrAndLogdLogger{android::base::SYSTEM});
bool wait_for_keystroke = false;
bool enable_verbose = false;
bool command_format_text = false; // false = binary.
int arg_input_fd = -1;
int arg_output_fd = -1;
std::vector<std::string> arg_input_filenames;
bool arg_use_sockets = false;
LOG(VERBOSE) << "argparse: argc=" << argc;
for (int arg = 1; arg < argc; ++arg) {
std::string argstr = argv[arg];
bool has_arg_next = (arg+1)<argc;
std::string arg_next = has_arg_next ? argv[arg+1] : "";
LOG(VERBOSE) << "argparse: argv[" << arg << "]=" << argstr;
if (argstr == "--help" || argstr == "-h") {
Usage(argv);
} else if (argstr == "--input-fd" || argstr == "-if") {
if (!has_arg_next) {
LOG(ERROR) << "--input-fd=<numeric-value>";
Usage(argv);
}
if (!::android::base::ParseInt(arg_next, /*out*/&arg_input_fd)) {
LOG(ERROR) << "--input-fd value must be numeric";
Usage(argv);
}
} else if (argstr == "--output-fd" || argstr == "-of") {
if (!has_arg_next) {
LOG(ERROR) << "--output-fd=<numeric-value>";
Usage(argv);
}
if (!::android::base::ParseInt(arg_next, /*out*/&arg_output_fd)) {
LOG(ERROR) << "--output-fd value must be numeric";
Usage(argv);
}
} else if (argstr == "--command-format=" || argstr == "-cf") {
if (!has_arg_next) {
LOG(ERROR) << "--command-format=text|binary";
Usage(argv);
}
if (arg_next == "text") {
command_format_text = true;
} else if (arg_next == "binary") {
command_format_text = false;
} else {
LOG(ERROR) << "--command-format must be one of {text,binary}";
Usage(argv);
}
} else if (argstr == "--use-sockets" || argstr == "-us") {
arg_use_sockets = true;
} else if (argstr == "--verbose" || argstr == "-v") {
enable_verbose = true;
} else if (argstr == "--wait" || argstr == "-w") {
wait_for_keystroke = true;
} else {
arg_input_filenames.push_back(argstr);
}
}
if (enable_verbose) {
android::base::SetMinimumLogSeverity(android::base::VERBOSE);
LOG(VERBOSE) << "Verbose check";
LOG(VERBOSE) << "Debug check: " << ::iorap::kIsDebugBuild;
} else {
android::base::SetMinimumLogSeverity(android::base::DEBUG);
}
LOG(VERBOSE) << "argparse: argc=" << argc;
for (int arg = 1; arg < argc; ++arg) {
std::string argstr = argv[arg];
LOG(VERBOSE) << "argparse: argv[" << arg << "]=" << argstr;
}
// Useful to attach a debugger...
// 1) $> iorap.cmd.readahead -w <args>
// 2) $> gdbclient <pid>
if (wait_for_keystroke) {
LOG(INFO) << "Self pid: " << getpid();
raise(SIGSTOP);
// LOG(INFO) << "Press any key to continue...";
// std::cin >> wait_for_keystroke;
}
// auto system_call = std::make_unique<SystemCallImpl>();
// TODO: mock readahead calls?
//
// Uncomment this if we want to leave the process around to inspect it from adb shell.
// sleep(100000);
int return_code = 0;
LOG(VERBOSE) << "Hello world";
if (arg_input_fd == -1) {
arg_input_fd = STDIN_FILENO;
}
if (arg_output_fd == -1) {
arg_output_fd = STDOUT_FILENO;
}
PrefetcherForkParameters params{};
params.input_fd = arg_input_fd;
params.output_fd = arg_output_fd;
params.format_text = command_format_text;
params.use_sockets = arg_use_sockets;
LOG(VERBOSE) << "main: Starting PrefetcherDaemon: "
<< "input_fd=" << params.input_fd
<< ",output_fd=" << params.output_fd;
{
PrefetcherDaemon daemon;
// Blocks until receiving an exit command.
daemon.Main(std::move(params));
}
LOG(VERBOSE) << "main: Terminating";
// 0 -> successfully executed all commands.
// 1 -> failed along the way (#on_error and also see the error logs).
return return_code;
}
} // namespace iorap::prefetcher
int main(int argc, char** argv) {
return ::iorap::prefetcher::Main(argc, argv);
}
#endif // IORAP_PREFETCHER_MAIN
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