Synnefo

# Copyright 2012, 2013 GRNET S.A. All rights reserved.

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from synnefo.lib.db.intdecimalfield import intDecimalField

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

                              ForeignKey, AutoField)

from django.db import transaction

from synnefo.lib.db.managers import ForUpdateManager

class Policy(Model):

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

    quantity        =   intDecimalField()

    capacity        =   intDecimalField()

    objects     =   ForUpdateManager()

class Holding(Model):

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

    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 = (('holder', '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)

    holder      =   CharField(max_length=4096, db_index=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)

    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_imported     =   intDecimalField()

    source_exported     =   intDecimalField()

    source_returned     =   intDecimalField()

    source_released     =   intDecimalField()

    target_quantity     =   intDecimalField()

    target_capacity     =   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

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_policy(*args, **kwargs):

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

def db_get_commission(*args, **kwargs):

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

def db_filter_provision(*args, **kwargs):

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