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import logging |
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from concurrent.futures import ProcessPoolExecutor |
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from multiprocessing import cpu_count |
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import progressbar |
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from django.apps import apps |
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from django.core.files.storage import get_storage_class |
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from django.core.management import BaseCommand, CommandError |
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from stdimage.utils import render_variations |
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logger = logging.getLogger() |
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class Command(BaseCommand): |
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help = 'Renders all variations of a StdImageField.' |
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args = '<app.model.field app.model.field>' |
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def add_arguments(self, parser): |
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parser.add_argument('field_path', |
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nargs='+', |
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type=str, |
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help='<app.model.field app.model.field>') |
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parser.add_argument('--replace', |
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action='store_true', |
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dest='replace', |
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default=False, |
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help='Replace existing files.') |
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parser.add_argument('--ignore-missing', |
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action='store_true', |
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dest='ignore_missing', |
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default=False, |
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help='Do not rise exception on missing file ' |
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'and use log.error instead.') |
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def handle(self, *args, **options): |
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replace = options.get('replace', False) |
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ignore_missing = options.get('ignore_missing', False) |
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routes = options.get('field_path', []) |
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for route in routes: |
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try: |
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app_label, model_name, field_name = route.rsplit('.') |
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except ValueError: |
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raise CommandError("Error parsing field_path '{}'. Use format " |
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"<app.model.field app.model.field>." |
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.format(route)) |
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model_class = apps.get_model(app_label, model_name) |
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field = model_class._meta.get_field(field_name) |
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queryset = model_class._default_manager \ |
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.exclude(**{'%s__isnull' % field_name: True}) \ |
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.exclude(**{field_name: ''}) |
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obj = queryset.first() |
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do_render = True |
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if obj: |
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f = getattr(obj, field_name) |
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do_render = f.field.render_variations |
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images = queryset.values_list(field_name, flat=True).iterator() |
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count = queryset.count() |
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self.render(field, images, count, replace, ignore_missing, |
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do_render) |
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@staticmethod |
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def render(field, images, count, replace, ignore_missing, do_render): |
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kwargs_list = ( |
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dict( |
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file_name=file_name, |
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do_render=do_render, |
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variations=field.variations, |
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replace=replace, |
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storage=field.storage.deconstruct()[0], |
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field_class=field.attr_class, |
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ignore_missing=ignore_missing, |
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) |
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for file_name in images |
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) |
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with progressbar.ProgressBar(maxval=count, widgets=( |
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progressbar.RotatingMarker(), |
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' | CPUs: {}'.format(cpu_count()), |
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' | ', progressbar.AdaptiveETA(), |
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' | ', progressbar.Percentage(), |
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' ', progressbar.Bar(), |
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)) as bar: |
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with ProcessPoolExecutor() as executor: |
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for _ in executor.map(render_field_variations, kwargs_list): |
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bar += 1 |
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90
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91
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def render_field_variations(kwargs): |
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kwargs['storage'] = get_storage_class(kwargs['storage'])() |
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ignore_missing = kwargs.pop('ignore_missing') |
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do_render = kwargs.pop('do_render') |
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try: |
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if callable(do_render): |
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kwargs.pop('field_class') |
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do_render = do_render(**kwargs) |
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if do_render: |
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render_variations(**kwargs) |
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except FileNotFoundError as e: |
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if not ignore_missing: |
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raise |
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else: |
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logger.error(str(e)) |
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codingjoe /
django-stdimage
