155 lines
4.7 KiB
Python
155 lines
4.7 KiB
Python
from __future__ import unicode_literals
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import hashlib
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import json
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import logging
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from furl import furl
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from django.apps import apps
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from django.conf import settings
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from django.contrib.contenttypes.fields import GenericForeignKey
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from django.contrib.contenttypes.models import ContentType
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from django.core import serializers
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from django.db import models
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from django.db.models import Max
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from django.urls import reverse
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from django.utils.encoding import (
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force_bytes, force_text, python_2_unicode_compatible
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)
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from django.utils.functional import cached_property
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from django.utils.translation import ugettext_lazy as _
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from mayan.apps.common.serialization import yaml_load
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from mayan.apps.common.validators import YAMLValidator
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from .classes import ControlCode
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from .literals import CONTROL_SHEET_CODE_IMAGE_CACHE_NAME
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logger = logging.getLogger(__name__)
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@python_2_unicode_compatible
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class ControlSheet(models.Model):
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label = models.CharField(
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max_length=196, unique=True, verbose_name=_('Label')
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)
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def __str__(self):
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return self.label
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def get_absolute_url(self):
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return reverse(
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viewname='control_codes:control_sheet_detail', kwargs={
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'control_sheet_id': self.pk
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}
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)
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class Meta:
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ordering = ('label',)
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verbose_name = _('Control sheet')
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verbose_name_plural = _('Control sheets')
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class ControlSheetCode(models.Model):
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control_sheet = models.ForeignKey(
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on_delete=models.CASCADE, related_name='codes', to=ControlSheet,
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verbose_name=_('Control sheet')
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)
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order = models.PositiveIntegerField(
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blank=True, db_index=True, default=0, help_text=_(
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'Order in which the transformations will be executed. If left '
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'unchanged, an automatic order value will be assigned.'
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), verbose_name=_('Order')
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)
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name = models.CharField(
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choices=ControlCode.get_choices(),
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max_length=128, verbose_name=_('Name')
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)
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arguments = models.TextField(
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blank=True, help_text=_(
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'Enter the arguments for the control code as a YAML '
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'dictionary.'
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), validators=[YAMLValidator()], verbose_name=_('Arguments')
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)
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enabled = models.BooleanField(default=True, verbose_name=_('Enabled'))
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class Meta:
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verbose_name = _('Control sheet code')
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verbose_name_plural = _('Control sheet codes')
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@cached_property
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def cache(self):
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Cache = apps.get_model(app_label='file_caching', model_name='Cache')
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return Cache.objects.get(name=CONTROL_SHEET_CODE_IMAGE_CACHE_NAME)
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@cached_property
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def cache_partition(self):
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partition, created = self.cache.partitions.get_or_create(
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name='{}'.format(self.pk)
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)
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return partition
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def delete(self, *args, **kwargs):
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self.cache_partition.delete()
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return super(Workflow, self).delete(*args, **kwargs)
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def generate_image(self):
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cache_filename = '{}'.format(self.get_hash())
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if self.cache_partition.get_file(filename=cache_filename):
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logger.debug(
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'workflow cache file "%s" found', cache_filename
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)
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else:
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logger.debug(
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'workflow cache file "%s" not found', cache_filename
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)
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image = self.render()
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with self.cache_partition.create_file(filename=cache_filename) as file_object:
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#file_object.write(image)
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image.save(file_object)
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return cache_filename
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def get_api_image_url(self, *args, **kwargs):
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final_url = furl()
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final_url.args = kwargs
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final_url.path = reverse(
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viewname='rest_api:workflow-image',
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kwargs={'pk': self.pk}
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)
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final_url.args['_hash'] = self.get_hash()
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return final_url.tostr()
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def get_arguments(self):
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return yaml_load(self.arguments or '{}')
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def get_control_code_class(self):
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return ControlCode.get(name=self.name)
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def get_hash(self):
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objects_lists = list(
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ControlSheetCode.objects.filter(pk=self.pk)
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)
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return hashlib.sha256(
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force_bytes(
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serializers.serialize('json', objects_lists)
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)
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).hexdigest()
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def render(self):
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return self.get_control_code_class()(**self.get_arguments()).image
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def save(self, *args, **kwargs):
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if not self.order:
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last_order = ControlSheetCode.objects.filter(
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control_sheet=self.control_sheet
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).aggregate(Max('order'))['order__max']
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if last_order is not None:
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self.order = last_order + 1
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super(ControlSheetCode, self).save(*args, **kwargs)
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