Файловый менеджер

Файловый менеджер - Редактировать - /usr/lib/python3.6/site-packages/tuned/daemon/application.py

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from tuned import storage, units, monitors, plugins, profiles, exports, hardware from tuned.exceptions import TunedException import tuned.logs import tuned.version from . import controller from . import daemon import signal import os import sys import select import struct import tuned.consts as consts from tuned.utils.global_config import GlobalConfig log = tuned.logs.get() __all__ = ["Application"] class Application(object): def __init__(self, profile_name = None, config = None): # os.uname()[2] is for the python-2.7 compatibility, it's the release string # like e.g. '5.15.13-100.fc34.x86_64' log.info("TuneD: %s, kernel: %s" % (tuned.version.TUNED_VERSION_STR, os.uname()[2])) self._dbus_exporter = None self._unix_socket_exporter = None storage_provider = storage.PickleProvider() storage_factory = storage.Factory(storage_provider) self.config = GlobalConfig() if config is None else config if self.config.get_bool(consts.CFG_DYNAMIC_TUNING): log.info("dynamic tuning is enabled (can be overridden in plugins)") else: log.info("dynamic tuning is globally disabled") monitors_repository = monitors.Repository() udev_buffer_size = self.config.get_size("udev_buffer_size", consts.CFG_DEF_UDEV_BUFFER_SIZE) hardware_inventory = hardware.Inventory(buffer_size=udev_buffer_size) device_matcher = hardware.DeviceMatcher() device_matcher_udev = hardware.DeviceMatcherUdev() plugin_instance_factory = plugins.instance.Factory() self.variables = profiles.variables.Variables() plugins_repository = plugins.Repository(monitors_repository, storage_factory, hardware_inventory,\ device_matcher, device_matcher_udev, plugin_instance_factory, self.config, self.variables) def_instance_priority = int(self.config.get(consts.CFG_DEFAULT_INSTANCE_PRIORITY, consts.CFG_DEF_DEFAULT_INSTANCE_PRIORITY)) unit_manager = units.Manager( plugins_repository, monitors_repository, def_instance_priority, hardware_inventory, self.config) profile_factory = profiles.Factory() profile_merger = profiles.Merger() profile_locator = profiles.Locator(consts.LOAD_DIRECTORIES) profile_loader = profiles.Loader(profile_locator, profile_factory, profile_merger, self.config, self.variables) self._daemon = daemon.Daemon(unit_manager, profile_loader, profile_name, self.config, self) self._controller = controller.Controller(self._daemon, self.config) self._init_signals() self._pid_file = None def _handle_signal(self, signal_number, handler): def handler_wrapper(_signal_number, _frame): if signal_number == _signal_number: handler() signal.signal(signal_number, handler_wrapper) def _init_signals(self): self._handle_signal(signal.SIGHUP, self._controller.sighup) self._handle_signal(signal.SIGINT, self._controller.terminate) self._handle_signal(signal.SIGTERM, self._controller.terminate) def attach_to_dbus(self, bus_name, object_name, interface_name, namespace): if self._dbus_exporter is not None: raise TunedException("DBus interface is already initialized.") self._dbus_exporter = exports.dbus.DBusExporter(bus_name, interface_name, object_name, namespace) exports.register_exporter(self._dbus_exporter) def attach_to_unix_socket(self): if self._unix_socket_exporter is not None: raise TunedException("Unix socket interface is already initialized.") self._unix_socket_exporter = exports.unix_socket.UnixSocketExporter(self.config.get(consts.CFG_UNIX_SOCKET_PATH), self.config.get(consts.CFG_UNIX_SOCKET_SIGNAL_PATHS), self.config.get(consts.CFG_UNIX_SOCKET_OWNERSHIP), self.config.get_int(consts.CFG_UNIX_SOCKET_PERMISIONS), self.config.get_int(consts.CFG_UNIX_SOCKET_CONNECTIONS_BACKLOG)) exports.register_exporter(self._unix_socket_exporter) def register_controller(self): exports.register_object(self._controller) def _daemonize_parent(self, parent_in_fd, child_out_fd): """ Wait till the child signalizes that the initialization is complete by writing some uninteresting data into the pipe. """ os.close(child_out_fd) (read_ready, drop, drop) = select.select([parent_in_fd], [], [], consts.DAEMONIZE_PARENT_TIMEOUT) if len(read_ready) != 1: os.close(parent_in_fd) raise TunedException("Cannot daemonize, timeout when waiting for the child process.") response = os.read(parent_in_fd, 8) os.close(parent_in_fd) if len(response) == 0: raise TunedException("Cannot daemonize, no response from child process received.") try: val = struct.unpack("?", response)[0] except struct.error: raise TunedException("Cannot daemonize, invalid response from child process received.") if val != True: raise TunedException("Cannot daemonize, child process reports failure.") def write_pid_file(self, pid_file = consts.PID_FILE): self._pid_file = pid_file self._delete_pid_file() try: dir_name = os.path.dirname(self._pid_file) if not os.path.exists(dir_name): os.makedirs(dir_name) with os.fdopen(os.open(self._pid_file, os.O_CREAT\|os.O_TRUNC\|os.O_WRONLY , 0o644), "w") as f: f.write("%d" % os.getpid()) except (OSError,IOError) as error: log.critical("cannot write the PID to %s: %s" % (self._pid_file, str(error))) def _delete_pid_file(self): if os.path.exists(self._pid_file): try: os.unlink(self._pid_file) except OSError as error: log.warning("cannot remove existing PID file %s, %s" % (self._pid_file, str(error))) def _daemonize_child(self, pid_file, parent_in_fd, child_out_fd): """ Finishes daemonizing process, writes a PID file and signalizes to the parent that the initialization is complete. """ os.close(parent_in_fd) os.chdir("/") os.setsid() os.umask(0) try: pid = os.fork() if pid > 0: sys.exit(0) except OSError as error: log.critical("cannot daemonize, fork() error: %s" % str(error)) val = struct.pack("?", False) os.write(child_out_fd, val) os.close(child_out_fd) raise TunedException("Cannot daemonize, second fork() failed.") fd = open("/dev/null", "w+") os.dup2(fd.fileno(), sys.stdin.fileno()) os.dup2(fd.fileno(), sys.stdout.fileno()) os.dup2(fd.fileno(), sys.stderr.fileno()) self.write_pid_file(pid_file) log.debug("successfully daemonized") val = struct.pack("?", True) os.write(child_out_fd, val) os.close(child_out_fd) def daemonize(self, pid_file = consts.PID_FILE): """ Daemonizes the application. In case of failure, TunedException is raised in the parent process. If the operation is successfull, the main process is terminated and only child process returns from this method. """ parent_child_fds = os.pipe() try: child_pid = os.fork() except OSError as error: os.close(parent_child_fds[0]) os.close(parent_child_fds[1]) raise TunedException("Cannot daemonize, fork() failed.") try: if child_pid > 0: self._daemonize_parent(parent_child_fds) sys.exit(0) else: self._daemonize_child(pid_file, parent_child_fds) except: # pass exceptions only into parent process if child_pid > 0: raise else: sys.exit(1) @property def daemon(self): return self._daemon @property def controller(self): return self._controller def run(self, daemon): # override global config if ran from command line with daemon option (-d) if daemon: self.config.set(consts.CFG_DAEMON, True) if not self.config.get_bool(consts.CFG_DAEMON, consts.CFG_DEF_DAEMON): log.warn("Using one shot no daemon mode, most of the functionality will be not available, it can be changed in global config") result = self._controller.run() if self.config.get_bool(consts.CFG_DAEMON, consts.CFG_DEF_DAEMON): exports.stop() if self._pid_file is not None: self._delete_pid_file() return result

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