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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
// This file contains a program for running the test suite in a separate
// process. The other alternative is to run the suite in-process. See
// conformance.proto for pros/cons of these two options.
//
// This program will fork the process under test and communicate with it over
// its stdin/stdout:
//
// +--------+ pipe +----------+
// | tester | <------> | testee |
// | | | |
// | C++ | | any lang |
// +--------+ +----------+
//
// The tester contains all of the test cases and their expected output.
// The testee is a simple program written in the target language that reads
// each test case and attempts to produce acceptable output for it.
//
// Every test consists of a ConformanceRequest/ConformanceResponse
// request/reply pair. The protocol on the pipe is simply:
//
// 1. tester sends 4-byte length N (little endian)
// 2. tester sends N bytes representing a ConformanceRequest proto
// 3. testee sends 4-byte length M (little endian)
// 4. testee sends M bytes representing a ConformanceResponse proto
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <future>
#include <vector>
#include "absl/log/absl_log.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_format.h"
#include "conformance/conformance.pb.h"
#include "conformance_test.h"
#include "google/protobuf/endian.h"
using conformance::ConformanceResponse;
using google::protobuf::ConformanceTestSuite;
using std::string;
using std::vector;
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define CHECK_SYSCALL(call) \
if (call < 0) { \
perror(#call " " __FILE__ ":" TOSTRING(__LINE__)); \
exit(1); \
}
namespace google {
namespace protobuf {
void ParseFailureList(const char *filename,
conformance::FailureSet *failure_list) {
std::ifstream infile(filename);
if (!infile.is_open()) {
fprintf(stderr, "Couldn't open failure list file: %s\n", filename);
exit(1);
}
for (string line; getline(infile, line);) {
// Remove whitespace.
line.erase(std::remove_if(line.begin(), line.end(), ::isspace), line.end());
// Remove comments.
line = line.substr(0, line.find("#"));
if (!line.empty()) {
failure_list->add_failure(line);
}
}
}
void UsageError() {
fprintf(stderr, "Usage: conformance-test-runner [options] <test-program>\n");
fprintf(stderr, "\n");
fprintf(stderr, "Options:\n");
fprintf(stderr,
" --failure_list <filename> Use to specify list of tests\n");
fprintf(stderr,
" that are expected to fail. File\n");
fprintf(stderr,
" should contain one test name per\n");
fprintf(stderr,
" line. Use '#' for comments.\n");
fprintf(stderr,
" --text_format_failure_list <filename> Use to specify list \n");
fprintf(stderr,
" of tests that are expected to \n");
fprintf(stderr, " fail in the \n");
fprintf(stderr,
" text_format_conformance_suite. \n");
fprintf(stderr,
" File should contain one test name \n");
fprintf(stderr,
" per line. Use '#' for comments.\n");
fprintf(stderr,
" --enforce_recommended Enforce that recommended test\n");
fprintf(stderr,
" cases are also passing. Specify\n");
fprintf(stderr,
" this flag if you want to be\n");
fprintf(stderr,
" strictly conforming to protobuf\n");
fprintf(stderr, " spec.\n");
fprintf(stderr,
" --maximum_edition <edition> Only run conformance tests up\n");
fprintf(stderr,
" to and including the specified\n");
fprintf(stderr, " edition.\n");
fprintf(stderr,
" --output_dir <dirname> Directory to write\n"
" output files.\n");
exit(1);
}
void ForkPipeRunner::RunTest(const std::string &test_name,
const std::string &request,
std::string *response) {
if (child_pid_ < 0) {
SpawnTestProgram();
}
current_test_name_ = test_name;
uint32_t len =
internal::little_endian::FromHost(static_cast<uint32_t>(request.size()));
CheckedWrite(write_fd_, &len, sizeof(uint32_t));
CheckedWrite(write_fd_, request.c_str(), request.size());
if (!TryRead(read_fd_, &len, sizeof(uint32_t))) {
// We failed to read from the child, assume a crash and try to reap.
ABSL_LOG(INFO) << "Trying to reap child, pid=" << child_pid_;
int status = 0;
waitpid(child_pid_, &status, WEXITED);
string error_msg;
conformance::ConformanceResponse response_obj;
if (WIFEXITED(status)) {
if (WEXITSTATUS(status) == 0) {
absl::StrAppendFormat(&error_msg,
"child timed out, killed by signal %d",
WTERMSIG(status));
response_obj.set_timeout_error(error_msg);
} else {
absl::StrAppendFormat(&error_msg, "child exited, status=%d",
WEXITSTATUS(status));
response_obj.set_runtime_error(error_msg);
}
} else if (WIFSIGNALED(status)) {
absl::StrAppendFormat(&error_msg, "child killed by signal %d",
WTERMSIG(status));
}
ABSL_LOG(INFO) << error_msg;
child_pid_ = -1;
response_obj.SerializeToString(response);
return;
}
len = internal::little_endian::ToHost(len);
response->resize(len);
CheckedRead(read_fd_, (void *)response->c_str(), len);
}
int ForkPipeRunner::Run(int argc, char *argv[],
const std::vector<ConformanceTestSuite *> &suites) {
if (suites.empty()) {
fprintf(stderr, "No test suites found.\n");
return EXIT_FAILURE;
}
bool all_ok = true;
for (ConformanceTestSuite *suite : suites) {
string program;
std::vector<string> program_args;
string failure_list_filename;
conformance::FailureSet failure_list;
bool performance = false;
for (int arg = 1; arg < argc; ++arg) {
if (strcmp(argv[arg], suite->GetFailureListFlagName().c_str()) == 0) {
if (++arg == argc) UsageError();
failure_list_filename = argv[arg];
ParseFailureList(argv[arg], &failure_list);
} else if (strcmp(argv[arg], "--performance") == 0) {
performance = true;
suite->SetPerformance(true);
} else if (strcmp(argv[arg], "--verbose") == 0) {
suite->SetVerbose(true);
} else if (strcmp(argv[arg], "--enforce_recommended") == 0) {
suite->SetEnforceRecommended(true);
} else if (strcmp(argv[arg], "--maximum_edition") == 0) {
if (++arg == argc) UsageError();
Edition edition = EDITION_UNKNOWN;
if (!Edition_Parse(absl::StrCat("EDITION_", argv[arg]), &edition)) {
fprintf(stderr, "Unknown edition: %s\n", argv[arg]);
UsageError();
}
suite->SetMaximumEdition(edition);
} else if (strcmp(argv[arg], "--output_dir") == 0) {
if (++arg == argc) UsageError();
suite->SetOutputDir(argv[arg]);
} else if (argv[arg][0] == '-') {
bool recognized_flag = false;
for (ConformanceTestSuite *suite : suites) {
if (strcmp(argv[arg], suite->GetFailureListFlagName().c_str()) == 0) {
if (++arg == argc) UsageError();
recognized_flag = true;
}
}
if (!recognized_flag) {
fprintf(stderr, "Unknown option: %s\n", argv[arg]);
UsageError();
}
} else {
program += argv[arg++];
while (arg < argc) {
program_args.push_back(argv[arg]);
arg++;
}
}
}
ForkPipeRunner runner(program, program_args, performance);
std::string output;
all_ok = all_ok && suite->RunSuite(&runner, &output, failure_list_filename,
&failure_list);
fwrite(output.c_str(), 1, output.size(), stderr);
}
return all_ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
// TODO: make this work on Windows, instead of using these
// UNIX-specific APIs.
//
// There is a platform-agnostic API in
// src/google/protobuf/compiler/subprocess.h
//
// However that API only supports sending a single message to the subprocess.
// We really want to be able to send messages and receive responses one at a
// time:
//
// 1. Spawning a new process for each test would take way too long for thousands
// of tests and subprocesses like java that can take 100ms or more to start
// up.
//
// 2. Sending all the tests in one big message and receiving all results in one
// big message would take away our visibility about which test(s) caused a
// crash or other fatal error. It would also give us only a single failure
// instead of all of them.
void ForkPipeRunner::SpawnTestProgram() {
int toproc_pipe_fd[2];
int fromproc_pipe_fd[2];
if (pipe(toproc_pipe_fd) < 0 || pipe(fromproc_pipe_fd) < 0) {
perror("pipe");
exit(1);
}
pid_t pid = fork();
if (pid < 0) {
perror("fork");
exit(1);
}
if (pid) {
// Parent.
CHECK_SYSCALL(close(toproc_pipe_fd[0]));
CHECK_SYSCALL(close(fromproc_pipe_fd[1]));
write_fd_ = toproc_pipe_fd[1];
read_fd_ = fromproc_pipe_fd[0];
child_pid_ = pid;
} else {
// Child.
CHECK_SYSCALL(close(STDIN_FILENO));
CHECK_SYSCALL(close(STDOUT_FILENO));
CHECK_SYSCALL(dup2(toproc_pipe_fd[0], STDIN_FILENO));
CHECK_SYSCALL(dup2(fromproc_pipe_fd[1], STDOUT_FILENO));
CHECK_SYSCALL(close(toproc_pipe_fd[0]));
CHECK_SYSCALL(close(fromproc_pipe_fd[1]));
CHECK_SYSCALL(close(toproc_pipe_fd[1]));
CHECK_SYSCALL(close(fromproc_pipe_fd[0]));
std::unique_ptr<char[]> executable(new char[executable_.size() + 1]);
memcpy(executable.get(), executable_.c_str(), executable_.size());
executable[executable_.size()] = '\0';
std::vector<const char *> argv;
argv.push_back(executable.get());
ABSL_LOG(INFO) << argv[0];
for (size_t i = 0; i < executable_args_.size(); ++i) {
argv.push_back(executable_args_[i].c_str());
ABSL_LOG(INFO) << executable_args_[i];
}
argv.push_back(nullptr);
// Never returns.
CHECK_SYSCALL(execv(executable.get(), const_cast<char **>(argv.data())));
}
}
void ForkPipeRunner::CheckedWrite(int fd, const void *buf, size_t len) {
if (static_cast<size_t>(write(fd, buf, len)) != len) {
ABSL_LOG(FATAL) << current_test_name_
<< ": error writing to test program: " << strerror(errno);
}
}
bool ForkPipeRunner::TryRead(int fd, void *buf, size_t len) {
size_t ofs = 0;
while (len > 0) {
std::future<ssize_t> future = std::async(
std::launch::async,
[](int fd, void *buf, size_t ofs, size_t len) {
return read(fd, (char *)buf + ofs, len);
},
fd, buf, ofs, len);
std::future_status status;
if (performance_) {
status = future.wait_for(std::chrono::seconds(5));
if (status == std::future_status::timeout) {
ABSL_LOG(ERROR) << current_test_name_ << ": timeout from test program";
kill(child_pid_, SIGQUIT);
// TODO: Only log in flag-guarded mode, since reading output
// from SIGQUIT is slow and verbose.
std::vector<char> err;
err.resize(5000);
ssize_t err_bytes_read;
size_t err_ofs = 0;
do {
err_bytes_read =
read(fd, (void *)&err[err_ofs], err.size() - err_ofs);
err_ofs += err_bytes_read;
} while (err_bytes_read > 0 && err_ofs < err.size());
ABSL_LOG(ERROR) << "child_pid_=" << child_pid_ << " SIGQUIT: \n"
<< &err[0];
return false;
}
} else {
future.wait();
}
ssize_t bytes_read = future.get();
if (bytes_read == 0) {
ABSL_LOG(ERROR) << current_test_name_
<< ": unexpected EOF from test program";
return false;
} else if (bytes_read < 0) {
ABSL_LOG(ERROR) << current_test_name_
<< ": error reading from test program: "
<< strerror(errno);
return false;
}
len -= bytes_read;
ofs += bytes_read;
}
return true;
}
void ForkPipeRunner::CheckedRead(int fd, void *buf, size_t len) {
if (!TryRead(fd, buf, len)) {
ABSL_LOG(FATAL) << current_test_name_
<< ": error reading from test program: " << strerror(errno);
}
}
} // namespace protobuf
} // namespace google