uncloud-mravi/nicohack202002/uncloud/uncloud_api/models.py

import uuid

from django.db import models
from django.contrib.auth import get_user_model

# Product in DB vs. product in code
# DB:
# - need to define params (+param types) in db -> messy?
# - get /products/ is easy / automatic
#
# code
# - can have serializer/verification of fields easily in DRF
# - can have per product side effects / extra code running
# - might (??) make features easier??
# - how to setup / query the recurring period (?)
# - could get products list via getattr() + re ...Product() classes
# -> this could include the url for ordering => /order/vm_snapshot (params)
# ---> this would work with urlpatterns

# Combination: create specific product in DB (?)
# - a table per product (?) with 1 entry?

# Orders
# define state in DB
# select a price from a product => product might change, order stays
# params:
# - the product uuid or name (?) => productuuid
# - the product parameters => for each feature
#

# logs
# Should have a log = ... => 1:n field for most models!

class Product(models.Model):

    description = ""

    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=256)

    recurring_period = models.CharField(max_length=256,
                                        choices = (
                                            ("per_year", "Per Year"),
                                            ("per_month", "Per Month"),
                                            ("per_week", "Per Week"),
                                            ("per_day", "Per Day"),
                                            ("per_hour", "Per Hour"),
                                            ("not_recurring", "Not recurring")
                                        ),
                                        default="not_recurring"
    )

    # params = [ vmuuid, ... ]
    # features -> required as defined

    def __str__(self):
        return "{}".format(self.name)


class VMSnapshotProduct(Product):
    # need to setup recurring_periodd

    description = "Create snapshot of a VM"


class Feature(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=256)

    recurring_price = models.FloatField(default=0)
    one_time_price = models.FloatField()

    product = models.ForeignKey(Product, on_delete=models.CASCADE)

    # params for "cpu": cpu_count -> int
    # each feature can only have one parameters
    # could call this "value" and set whether it is user usable
    # has_value = True/False
    # value = string  -> int (?)
    # value_int
    # value_str
    # value_float

    def __str__(self):
        return "'{}' - '{}'".format(self.product, self.name)


class Order(models.Model):
    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    owner = models.ForeignKey(get_user_model(),
                              on_delete=models.CASCADE)

    product = models.ForeignKey(Product,
                                on_delete=models.CASCADE)


class VMSnapshotOrder(Order):
    pass