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# -*- coding: utf-8 -*- |
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from __future__ import absolute_import, unicode_literals |
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import resource |
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import sys |
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import traceback |
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from multiprocessing import Pool, cpu_count |
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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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import progressbar |
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from stdimage.utils import render_variations |
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BAR = None |
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class MemoryUsageWidget(progressbar.widgets.WidgetBase): |
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def __call__(self, progress, data): |
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return 'RAM: {0:10.1f} MB'.format( |
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resource.getrusage(resource.RUSAGE_SELF).ru_maxrss / 1024 |
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) |
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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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def handle(self, *args, **options): |
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replace = options.get('replace') |
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if len(options['field_path']): |
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routes = options['field_path'] |
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else: |
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routes = [options['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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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) |
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@staticmethod |
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def render(field, images, count, replace): |
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pool = Pool( |
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initializer=init_progressbar, |
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initargs=[count] |
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) |
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args = [ |
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dict( |
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file_name=file_name, |
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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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) |
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for file_name in images |
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] |
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pool.map(render_field_variations, args) |
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pool.apply(finish_progressbar) |
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pool.close() |
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pool.join() |
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def init_progressbar(count): |
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global BAR |
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BAR = progressbar.ProgressBar(maxval=count, widgets=( |
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progressbar.RotatingMarker(), |
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' | ', MemoryUsageWidget(), |
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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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)) |
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def finish_progressbar(): |
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BAR.finish() |
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def render_field_variations(kwargs): |
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try: |
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kwargs['storage'] = get_storage_class(kwargs['storage'])() |
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render_variations(**kwargs) |
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global BAR |
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BAR += 1 |
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except: |
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raise Exception("".join(traceback.format_exception(*sys.exc_info()))) |
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codingjoe /
django-stdimage
