faceswap/lib/cli/launcher.py

#!/usr/bin/env python3
""" Launches the correct script with the given Command Line Arguments """
import logging
import os
import platform
import sys

from importlib import import_module
from lib.logger import crash_log, log_setup
from lib.utils import FaceswapError, get_backend, safe_shutdown, set_system_verbosity

logger = logging.getLogger(__name__)  # pylint: disable=invalid-name


class ScriptExecutor():  # pylint:disable=too-few-public-methods
    """ Loads the relevant script modules and executes the script.

        This class is initialized in each of the argparsers for the relevant
        command, then execute script is called within their set_default
        function.

        Parameters
        ----------
        command: str
            The faceswap command that is being executed
        """
    def __init__(self, command):
        self._command = command.lower()

    def _import_script(self):
        """ Imports the relevant script as indicated by :attr:`_command` from the scripts folder.

        Returns
        -------
        class: Faceswap Script
            The uninitialized script from the faceswap scripts folder.
        """
        self._test_for_tf_version()
        self._test_for_gui()
        cmd = os.path.basename(sys.argv[0])
        src = "tools.{}".format(self._command.lower()) if cmd == "tools.py" else "scripts"
        mod = ".".join((src, self._command.lower()))
        module = import_module(mod)
        script = getattr(module, self._command.title())
        return script

    @staticmethod
    def _test_for_tf_version():
        """ Check that the required Tensorflow version is installed.

        Raises
        ------
        FaceswapError
            If Tensorflow is not found, or is not between versions 1.12 and 1.15
        """
        min_ver = 1.12
        max_ver = 1.15
        try:
            # Ensure tensorflow doesn't pin all threads to one core when using Math Kernel Library
            os.environ["KMP_AFFINITY"] = "disabled"
            import tensorflow as tf  # pylint:disable=import-outside-toplevel
        except ImportError as err:
            raise FaceswapError("There was an error importing Tensorflow. This is most likely "
                                "because you do not have TensorFlow installed, or you are trying "
                                "to run tensorflow-gpu on a system without an Nvidia graphics "
                                "card. Original import error: {}".format(str(err)))
        tf_ver = float(".".join(tf.__version__.split(".")[:2]))  # pylint:disable=no-member
        if tf_ver < min_ver:
            raise FaceswapError("The minimum supported Tensorflow is version {} but you have "
                                "version {} installed. Please upgrade Tensorflow.".format(
                                    min_ver, tf_ver))
        if tf_ver > max_ver:
            raise FaceswapError("The maximumum supported Tensorflow is version {} but you have "
                                "version {} installed. Please downgrade Tensorflow.".format(
                                    max_ver, tf_ver))
        logger.debug("Installed Tensorflow Version: %s", tf_ver)

    def _test_for_gui(self):
        """ If running the gui, performs check to ensure necessary prerequisites are present. """
        if self._command != "gui":
            return
        self._test_tkinter()
        self._check_display()

    @staticmethod
    def _test_tkinter():
        """ If the user is running the GUI, test whether the tkinter app is available on their
        machine. If not exit gracefully.

        This avoids having to import every tkinter function within the GUI in a wrapper and
        potentially spamming traceback errors to console.

        Raises
        ------
        FaceswapError
            If tkinter cannot be imported
        """
        try:
            # pylint: disable=unused-variable
            import tkinter  # noqa pylint: disable=unused-import,import-outside-toplevel
        except ImportError:
            logger.error("It looks like TkInter isn't installed for your OS, so the GUI has been "
                         "disabled. To enable the GUI please install the TkInter application. You "
                         "can try:")
            logger.info("Anaconda: conda install tk")
            logger.info("Windows/macOS: Install ActiveTcl Community Edition from "
                        "http://www.activestate.com")
            logger.info("Ubuntu/Mint/Debian: sudo apt install python3-tk")
            logger.info("Arch: sudo pacman -S tk")
            logger.info("CentOS/Redhat: sudo yum install tkinter")
            logger.info("Fedora: sudo dnf install python3-tkinter")
            raise FaceswapError("TkInter not found")

    @staticmethod
    def _check_display():
        """ Check whether there is a display to output the GUI to.

        If running on Windows then it is assumed that we are not running in headless mode

        Raises
        ------
        FaceswapError
            If a DISPLAY environmental cannot be found
        """
        if not os.environ.get("DISPLAY", None) and os.name != "nt":
            if platform.system() == "Darwin":
                logger.info("macOS users need to install XQuartz. "
                            "See https://support.apple.com/en-gb/HT201341")
            raise FaceswapError("No display detected. GUI mode has been disabled.")

    def execute_script(self, arguments):
        """ Performs final set up and launches the requested :attr:`_command` with the given
        command line arguments.

        Monitors for errors and attempts to shut down the process cleanly on exit.

        Parameters
        ----------
        arguments: :class:`argparse.Namespace`
            The command line arguments to be passed to the executing script.
        """
        set_system_verbosity(arguments.loglevel)
        is_gui = hasattr(arguments, "redirect_gui") and arguments.redirect_gui
        log_setup(arguments.loglevel, arguments.logfile, self._command, is_gui)
        logger.debug("Executing: %s. PID: %s", self._command, os.getpid())
        success = False
        if get_backend() == "amd":
            plaidml_found = self._setup_amd(arguments.loglevel)
            if not plaidml_found:
                safe_shutdown(got_error=True)
                return
        try:
            script = self._import_script()
            process = script(arguments)
            process.process()
            success = True
        except FaceswapError as err:
            for line in str(err).splitlines():
                logger.error(line)
        except KeyboardInterrupt:  # pylint: disable=try-except-raise
            raise
        except SystemExit:
            pass
        except Exception:  # pylint: disable=broad-except
            crash_file = crash_log()
            logger.exception("Got Exception on main handler:")
            logger.critical("An unexpected crash has occurred. Crash report written to '%s'. "
                            "You MUST provide this file if seeking assistance. Please verify you "
                            "are running the latest version of faceswap before reporting",
                            crash_file)

        finally:
            safe_shutdown(got_error=not success)

    @staticmethod
    def _setup_amd(log_level):
        """ Test for plaidml and perform setup for AMD.

        Parameters
        ----------
        log_level: str
            The requested log level to run at
        """
        logger.debug("Setting up for AMD")
        try:
            import plaidml  # noqa pylint:disable=unused-import,import-outside-toplevel
        except ImportError:
            logger.error("PlaidML not found. Run `pip install plaidml-keras` for AMD support")
            return False
        from lib.plaidml_tools import setup_plaidml  # pylint:disable=import-outside-toplevel
        setup_plaidml(log_level)
        logger.debug("setup up for PlaidML")
        return True