Synnefo

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from snf_django.lib.db.fields import intDecimalField

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

                              ForeignKey, AutoField)

from django.db import transaction

from snf_django.lib.db.managers import ForUpdateManager

class Holding(Model):

    holder      =   CharField(max_length=4096, db_index=True)

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

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

    limit       =   intDecimalField()

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

    imported_min    =   intDecimalField(default=0)

    imported_max    =   intDecimalField(default=0)

    objects     =   ForUpdateManager()

    class Meta:

        unique_together = (('holder', 'source', '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)

    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'   )

    holder      =   CharField(max_length=4096, db_index=True)

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

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

    quantity    =   intDecimalField()

    objects     =   ForUpdateManager()

    def todict(self):

        return {'holder':   self.holder,

                'source':   self.source,

                'resource': self.resource,

                'quantity': self.quantity,

                }

    def holding_key(self):

        return (self.holder, self.source, self.resource)

class ProvisionLog(Model):

    serial              =   BigIntegerField()

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

    issue_time          =   CharField(max_length=4096)

    log_time            =   CharField(max_length=4096)

    holder              =   CharField(max_length=4096)

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

    resource            =   CharField(max_length=4096)

    limit               =   intDecimalField()

    imported_min        =   intDecimalField()

    imported_max        =   intDecimalField()

    delta_quantity      =   intDecimalField()

    reason              =   CharField(max_length=4096)

    objects     =   ForUpdateManager()

def _get(*args, **kwargs):

    model = args[0]

    args = args[1:]

    o = model.objects

    for_update = kwargs.pop('for_update', False)

    f = o.get_for_update if for_update else o.get

    return f(*args, **kwargs)

def _filter(*args, **kwargs):

    model = args[0]

    args = args[1:]

    o = model.objects

    for_update = kwargs.pop('for_update', False)

    q = o.filter(*args, **kwargs)

    q = q.select_for_update() if for_update else q

    return q

def db_get_holding(*args, **kwargs):

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

def db_get_commission(*args, **kwargs):

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

def db_filter_provision(*args, **kwargs):

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