stov/lib_stov/youtubedl_wrapper.py

#
#        This file is part of stov, written by Helmut Pozimski 2012-2018.
#
#       stov is free software: you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation, version 2 of the License.
#
#       stov is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#
#       You should have received a copy of the GNU General Public License
#       along with stov.  If not, see <http://www.gnu.org/licenses/>.


# -*- coding: utf8 -*-

""" Provides a wrapper around youtube-dl"""

import subprocess
import sys
import logging

from lib_stov import stov_exceptions
from lib_stov import configuration

LOGGER = logging.getLogger("stov")


def get_ids(url, reverse=False):
    """
    Retrieves the IDs
    :param url: URL to pass to youtube-dl
    :type url: str
    :param reverse: look up a playlist in reverse order to get \
    the recent videos first
    :type reverse: bool
    :return: video IDs
    :rtype: list
    """
    conf = configuration.Conf.get_instance()
    videos_list = []
    if conf.outputlevel == "verbose":
        stderr = sys.stderr
    else:
        stderr = open("/dev/null", "w")
    LOGGER.debug(_("Executing command: %s %s %s %s %s %s"),
                 conf.values["youtube-dl"], "--max-downloads",
                 conf.values["maxvideos"], "-i", "--get-id", url)
    try:
        if reverse:
            video_ids = subprocess.check_output(
                [conf.values["youtube-dl"], "--max-downloads",
                 conf.values["maxvideos"], "-i", "--playlist-reverse",
                 "--get-id", url], stderr=stderr)
        else:
            video_ids = subprocess.check_output(
                [conf.values["youtube-dl"], "--max-downloads",
                 conf.values["maxvideos"],
                 "-i", "--get-id", url], stderr=stderr)
    except subprocess.CalledProcessError as error_message:
        video_ids = error_message.output
    video_ids = video_ids.decode(sys.stdout.encoding).strip()
    for video in video_ids.split("\n"):
        if video:
            videos_list.append(video)
    LOGGER.debug("generated list: %s", videos_list)
    return videos_list


def get_title(url):
    """
    Retrieves the title of a specified video

    :param url: URL to pass to youtube-dl
    :type url: str
    """
    conf = configuration.Conf.get_instance()
    if conf.outputlevel == "verbose":
        stderr = sys.stderr
    else:
        stderr = open("/dev/null", "w")
    LOGGER.debug(_("Executing command: %s %s %s"),
                 conf.values["youtube-dl"], "--get-title", url)
    video_title = subprocess.check_output([
        conf.values["youtube-dl"], "--get-title", url], stderr=stderr)
    video_title = video_title.decode(sys.stdout.encoding)
    return video_title


def download_video(url, itag_value):
    """
    Downloads a video from a specified url using youtube-dl.

    :param itag_value: video and audio parameter
    :type itag_value: str
    :param url: URL to pass to youtube-dl
    :type url: str
    """
    conf = configuration.Conf.get_instance()
    try:
        LOGGER.debug(_("Executing command: %s -f %s %s"),
                     conf.values["youtube-dl"], itag_value, url)
        if conf.outputlevel == "default":
            subprocess.check_call([conf.values["youtube-dl"], "-f %s"
                                   % itag_value,
                                   "-o", "%(title)s-%(id)s.%(ext)s", url],
                                  stderr=sys.stderr,
                                  stdout=open("/dev/null", "w"))
        elif conf.outputlevel == "verbose":
            subprocess.check_call([conf.values["youtube-dl"], "-f %s"
                                   % itag_value,
                                   "-o", "%(title)s-%(id)s.%(ext)s", url],
                                  stderr=sys.stderr, stdout=sys.stdout)
        elif conf.outputlevel == "quiet":
            subprocess.check_call([conf.values["youtube-dl"],
                                   "-f %s/%s" % itag_value,
                                   "-o", "%(title)s-%(id)s.%(ext)s", url],
                                  stderr=open("/dev/null", "w"),
                                  stdout=open("/dev/null", "w"))
    except subprocess.CalledProcessError as error:
        LOGGER.debug(_("Error while calling youtube-dl: %s"), error.output)
        raise stov_exceptions.YoutubeDlCallFailed()