Synnefo

# Copyright 2012 GRNET S.A. All rights reserved.

#

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#      disclaimer in the documentation and/or other materials

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from synnefo.lib.commissioning import CorruptedError

from django.core import exceptions

from django.db.models import (Model, BigIntegerField, CharField,

                              IntegerField, SubfieldBase,

                              ForeignKey, AutoField, DecimalField)

from django.db import transaction

from .managers import ForUpdateManager

class IntDecimalField(IntegerField):

    __metaclass__ = SubfieldBase

    def __init__(self, max_digits=None, **kwargs):

        self.max_digits, self.decimal_places = max_digits, 0

        IntegerField.__init__(self, **kwargs)

    def get_internal_type(self):

        return "DecimalField"

    def to_python(self, value):

        if value is None:

            return value

        try:

            return long(value)

        except (ValueError, TypeError):

            raise exceptions.ValidationError(self.error_messages['invalid'])

DECIMAL_DIGITS  =   38

def intDecimalField(**kwargs):

    return IntDecimalField(max_digits=DECIMAL_DIGITS, **kwargs)

class Holder(Model):

    attribute   =   CharField(max_length=4096, primary_key=True)

    intval      =   BigIntegerField()

    strval      =   CharField(max_length=4096)

    objects     =   ForUpdateManager()

class Entity(Model):

    entity      =   CharField(max_length=4096, primary_key=True)

    owner       =   ForeignKey('self', to_field='entity',

                               related_name='entities')

    key         =   CharField(max_length=4096, null=False)

    objects     =   ForUpdateManager()

class Policy(Model):

    policy          =   CharField(max_length=4096, primary_key=True)

    quantity        =   intDecimalField()

    capacity        =   intDecimalField()

    import_limit    =   intDecimalField()

    export_limit    =   intDecimalField()

    objects     =   ForUpdateManager()

class Holding(Model):

    entity      =   ForeignKey(Entity, to_field='entity')

    resource    =   CharField(max_length=4096, null=False)

    policy      =   ForeignKey(Policy, to_field='policy')

    flags       =   BigIntegerField(null=False, default=0)

    imported    =   intDecimalField(default=0)

    importing   =   intDecimalField(default=0)

    exported    =   intDecimalField(default=0)

    exporting   =   intDecimalField(default=0)

    returned    =   intDecimalField(default=0)

    returning   =   intDecimalField(default=0)

    released    =   intDecimalField(default=0)

    releasing   =   intDecimalField(default=0)

    objects     =   ForUpdateManager()

    class Meta:

        unique_together = (('entity', 'resource'),)

from datetime import datetime

def now():

    return datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S.%f')[:24]

class Commission(Model):

    serial      =   AutoField(primary_key=True)

    entity      =   ForeignKey(Entity, to_field='entity')

    name        =   CharField(max_length=4096, null=True)

    clientkey   =   CharField(max_length=4096, null=False)

    issue_time  =   CharField(max_length=24, default=now)

    objects     =   ForUpdateManager()

class Provision(Model):

    serial      =   ForeignKey( Commission,

                                to_field='serial',

                                related_name='provisions'   )

    entity      =   ForeignKey(Entity, to_field='entity')

    resource    =   CharField(max_length=4096, null=False)

    quantity    =   intDecimalField()

    objects     =   ForUpdateManager()

class ProvisionLog(Model):

    serial              =   BigIntegerField()

    source              =   CharField(max_length=4096)

    target              =   CharField(max_length=4096)

    name                =   CharField(max_length=4096)

    issue_time          =   CharField(max_length=4096)

    log_time            =   CharField(max_length=4096)

    resource            =   CharField(max_length=4096)

    source_quantity     =   intDecimalField()

    source_capacity     =   intDecimalField()

    source_import_limit =   intDecimalField()

    source_export_limit =   intDecimalField()

    source_imported     =   intDecimalField()

    source_exported     =   intDecimalField()

    source_returned     =   intDecimalField()

    source_released     =   intDecimalField()

    target_quantity     =   intDecimalField()

    target_capacity     =   intDecimalField()

    target_import_limit =   intDecimalField()

    target_export_limit =   intDecimalField()

    target_imported     =   intDecimalField()

    target_exported     =   intDecimalField()

    target_returned     =   intDecimalField()

    target_released     =   intDecimalField()

    delta_quantity      =   intDecimalField()

    reason              =   CharField(max_length=4096)

    objects     =   ForUpdateManager()

    def source_allocated_through(self):

        return self.source_imported - self.source_released

    def source_allocated(self):

        return (+ self.source_allocated_through()

                - self.source_exported

                + self.source_returned)

    def source_inbound_through(self):

        return self.source_imported

    def source_inbound(self):

        return self.source_inbound_through() + self.source_returned

    def source_outbound_through(self):

        return self.source_released

    def source_outbound(self):

        return self.source_outbound_through() + self.source_exported

    def target_allocated_through(self):

        return self.target_imported - self.target_released

    def target_allocated(self):

        return (+ self.target_allocated_through()

                - self.target_exported

                + self.target_returned)

    def target_inbound_through(self):

        return self.target_imported

    def target_inbound(self):

        return self.target_inbound_through() + self.target_returned

    def target_outbound_through(self):

        return self.target_released

    def target_outbound(self):

        return self.target_outbound_through() + self.target_exported

class CallSerial(Model):

    serial      =   BigIntegerField(null=False)

    clientkey   =   CharField(max_length=4096, null=False)

    objects     =   ForUpdateManager()

    class Meta:

        unique_together = (('serial', 'clientkey'),)

def _access(*args, **kwargs):

    method = args[0]

    model = args[1]

    args = args[2:]

    o = model.objects

    try:

        if kwargs['for_update']:

            del kwargs['for_update']

            o = o.select_for_update()

    except KeyError:

        pass

    f = getattr(o, method)

    return f(*args, **kwargs)

def _get(*args, **kwargs):

    return _access('get', *args, **kwargs)

def _filter(*args, **kwargs):

    return _access('filter', *args, **kwargs)

def db_get_holding(*args, **kwargs):

    return _get(Holding, *args, **kwargs)

def db_get_entity(*args, **kwargs):

    return _get(Entity, *args, **kwargs)

def db_get_policy(*args, **kwargs):

    return _get(Policy, *args, **kwargs)

def db_get_commission(*args, **kwargs):

    return _get(Commission, *args, **kwargs)

def db_get_callserial(*args, **kwargs):

    return _get(CallSerial, *args, **kwargs)

def db_filter_provision(*args, **kwargs):

    return _filter(Provision, *args, **kwargs)