91 lines
3.3 KiB
Python
91 lines
3.3 KiB
Python
from rest_framework import serializers
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from orchestra.api import router
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from orchestra.utils import database_ready
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from .models import Resource, ResourceData
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class ResourceSerializer(serializers.ModelSerializer):
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name = serializers.SerializerMethodField('get_name')
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unit = serializers.Field()
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class Meta:
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model = ResourceData
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fields = ('name', 'used', 'allocated', 'unit')
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read_only_fields = ('used',)
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def from_native(self, raw_data, files=None):
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data = super(ResourceSerializer, self).from_native(raw_data, files=files)
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if not data.resource_id:
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data.resource = Resource.objects.get(name=raw_data['name'])
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return data
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def get_name(self, instance):
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return instance.resource.name
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def get_identity(self, data):
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return data.get('name')
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# Monkey-patching section
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def insert_resource_serializers():
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# clean previous state
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for related in Resource._related:
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viewset = router.get_viewset(related)
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fields = list(viewset.serializer_class.Meta.fields)
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try:
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fields.remove('resources')
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except ValueError:
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pass
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viewset.serializer_class.Meta.fields = fields
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# Create nested serializers on target models
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for ct, resources in Resource.objects.group_by('content_type').items():
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model = ct.model_class()
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try:
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router.insert(model, 'resources', ResourceSerializer, required=False, many=True, source='resource_set')
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except KeyError:
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continue
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# TODO this is a fucking workaround, reimplement this on the proper place
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def validate_resources(self, attrs, source, _resources=resources):
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""" Creates missing resources """
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posted = attrs.get(source, [])
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result = []
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resources = list(_resources)
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for data in posted:
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resource = data.resource
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if resource not in resources:
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msg = "Unknown or duplicated resource '%s'." % resource
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raise serializers.ValidationError(msg)
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resources.remove(resource)
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if not resource.on_demand and not data.allocated:
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data.allocated = resource.default_allocation
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result.append(data)
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for resource in resources:
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data = ResourceData(resource=resource)
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if not resource.on_demand:
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data.allocated = resource.default_allocation
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result.append(data)
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attrs[source] = result
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return attrs
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viewset = router.get_viewset(model)
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viewset.serializer_class.validate_resources = validate_resources
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old_metadata = viewset.metadata
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def metadata(self, request, resources=resources):
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""" Provides available resources description """
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ret = old_metadata(self, request)
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ret['available_resources'] = [
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{
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'name': resource.name,
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'on_demand': resource.on_demand,
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'default_allocation': resource.default_allocation
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} for resource in resources
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]
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return ret
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viewset.metadata = metadata
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if database_ready():
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insert_resource_serializers()
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