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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/test/spawned_test_server/local_test_server.h"
#include <poll.h>
#include <vector>
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/process/kill.h"
#include "base/process/launch.h"
#include "base/process/process_iterator.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "net/test/python_utils.h"
namespace {
// Helper class used to detect and kill orphaned python test server processes.
// Checks if the command line of a process contains |path_string| (the path
// from which the test server was launched) and |port_string| (the port used by
// the test server), and if the parent pid of the process is 1 (indicating that
// it is an orphaned process).
class OrphanedTestServerFilter : public base::ProcessFilter {
public:
OrphanedTestServerFilter(
const std::string& path_string, const std::string& port_string)
: path_string_(path_string),
port_string_(port_string) {}
OrphanedTestServerFilter(const OrphanedTestServerFilter&) = delete;
OrphanedTestServerFilter& operator=(const OrphanedTestServerFilter&) = delete;
bool Includes(const base::ProcessEntry& entry) const override {
if (entry.parent_pid() != 1)
return false;
bool found_path_string = false;
bool found_port_string = false;
for (const auto& cmd_line_arg : entry.cmd_line_args()) {
if (cmd_line_arg.find(path_string_) != std::string::npos)
found_path_string = true;
if (cmd_line_arg.find(port_string_) != std::string::npos)
found_port_string = true;
}
return found_path_string && found_port_string;
}
private:
std::string path_string_;
std::string port_string_;
};
// Given a file descriptor, reads into |buffer| until |bytes_max|
// bytes has been read or an error has been encountered. Returns true
// if the read was successful.
bool ReadData(int fd, ssize_t bytes_max, uint8_t* buffer) {
ssize_t bytes_read = 0;
while (bytes_read < bytes_max) {
struct pollfd poll_fds[1];
poll_fds[0].fd = fd;
poll_fds[0].events = POLLIN | POLLPRI;
poll_fds[0].revents = 0;
// Each test itself has its own timeout, so no need to use one here.
int rv = HANDLE_EINTR(poll(poll_fds, 1, -1));
if (rv == 0) {
LOG(ERROR) << "poll() timed out; bytes_read=" << bytes_read;
return false;
} else if (rv < 0) {
PLOG(ERROR) << "poll() failed for child file descriptor; bytes_read="
<< bytes_read;
return false;
}
ssize_t num_bytes = HANDLE_EINTR(read(fd, buffer + bytes_read,
bytes_max - bytes_read));
if (num_bytes <= 0)
return false;
bytes_read += num_bytes;
}
return true;
}
} // namespace
namespace net {
bool LocalTestServer::LaunchPython(
const base::FilePath& testserver_path,
const std::vector<base::FilePath>& python_path) {
base::CommandLine python_command(base::CommandLine::NO_PROGRAM);
if (!GetPython3Command(&python_command))
return false;
python_command.AppendArgPath(testserver_path);
if (!AddCommandLineArguments(&python_command))
return false;
int pipefd[2];
if (pipe(pipefd) != 0) {
PLOG(ERROR) << "Could not create pipe.";
return false;
}
// Save the read half. The write half is sent to the child.
child_fd_.reset(pipefd[0]);
base::ScopedFD write_closer(pipefd[1]);
python_command.AppendArg("--startup-pipe=" + base::NumberToString(pipefd[1]));
// Try to kill any orphaned testserver processes that may be running.
OrphanedTestServerFilter filter(testserver_path.value(),
base::NumberToString(GetPort()));
if (!base::KillProcesses("python", -1, &filter)) {
LOG(WARNING) << "Failed to clean up older orphaned testserver instances.";
}
// Launch a new testserver process.
base::LaunchOptions options;
SetPythonPathInEnvironment(python_path, &options.environment);
// Log is useful in the event you want to run a nearby script (e.g. a test) in
// the same environment as the TestServer.
LOG(ERROR) << "LaunchPython called with PYTHONPATH = "
<< options.environment["PYTHONPATH"];
// Set CWD to source root.
if (!base::PathService::Get(base::DIR_SRC_TEST_DATA_ROOT,
&options.current_directory)) {
LOG(ERROR) << "Failed to get DIR_SRC_TEST_DATA_ROOT";
return false;
}
options.fds_to_remap.push_back(std::make_pair(pipefd[1], pipefd[1]));
LOG(ERROR) << "Running: " << python_command.GetCommandLineString();
process_ = base::LaunchProcess(python_command, options);
if (!process_.IsValid()) {
LOG(ERROR) << "Failed to launch " << python_command.GetCommandLineString();
return false;
}
return true;
}
bool LocalTestServer::WaitToStart() {
base::ScopedFD our_fd(child_fd_.release());
uint32_t server_data_len = 0;
if (!ReadData(our_fd.get(), sizeof(server_data_len),
reinterpret_cast<uint8_t*>(&server_data_len))) {
LOG(ERROR) << "Could not read server_data_len";
return false;
}
std::string server_data(server_data_len, '\0');
if (!ReadData(our_fd.get(), server_data_len,
reinterpret_cast<uint8_t*>(&server_data[0]))) {
LOG(ERROR) << "Could not read server_data (" << server_data_len
<< " bytes)";
return false;
}
int port;
if (!SetAndParseServerData(server_data, &port)) {
LOG(ERROR) << "Could not parse server_data: " << server_data;
return false;
}
SetPort(port);
return true;
}
} // namespace net
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