django-orchestra/orchestra/apps/orders/helpers.py

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import inspect
from orchestra.apps.accounts.models import Account
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def get_related_objects(origin, max_depth=2):
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"""
Introspects origin object and return the first related service object
WARNING this is NOT an exhaustive search but a compromise between cost and
flexibility. A more comprehensive approach may be considered if
a use-case calls for it.
"""
def related_iterator(node):
for field in node._meta.virtual_fields:
if hasattr(field, 'ct_field'):
yield getattr(node, field.name)
for field in node._meta.fields:
if field.rel:
yield getattr(node, field.name)
# BFS model relation transversal
queue = [[origin]]
while queue:
models = queue.pop(0)
if len(models) > max_depth:
return None
node = models[-1]
if len(models) > 1:
if hasattr(node, 'account') or isinstance(node, Account):
return node
for related in related_iterator(node):
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if related and related not in models:
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new_models = list(models)
new_models.append(related)
queue.append(new_models)
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def get_register_or_cancel_events(porders, order, ini, end):
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assert ini <= end, "ini > end"
CANCEL = 'cancel'
REGISTER = 'register'
changes = {}
counter = 0
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for num, porder in enumerate(porders.order_by('registered_on'), start=1):
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if porder == order:
position = num
if porder.cancelled_on:
cancel = porder.cancelled_on
if porder.billed_until and porder.cancelled_on < porder.billed_until:
cancel = porder.billed_until
if cancel > ini and cancel < end:
changes.setdefault(cancel, [])
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changes[cancel].append((CANCEL, num))
if porder.registered_on <= ini:
counter += 1
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elif porder.registered_on < end:
changes.setdefault(porder.registered_on, [])
changes[porder.registered_on].append((REGISTER, num))
pointer = ini
total = float((end-ini).days)
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for date in sorted(changes.keys()):
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yield counter, position, (date-pointer).days/total
for change, num in changes[date]:
if change is CANCEL:
counter -= 1
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if num < position:
position -= 1
else:
counter += 1
pointer = date
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yield counter, position, (end-pointer).days/total
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def get_register_or_renew_events(handler, porders, order, ini, end):
total = float((end-ini).days)
for sini, send in handler.get_pricing_slots(ini, end):
counter = 0
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position = -1
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for porder in porders.order_by('registered_on'):
if porder == order:
position = abs(position)
elif position < 0:
position -= 1
if porder.registered_on >= sini and porder.registered_on < send:
counter += 1
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elif porder.billed_until > send or porder.cancelled_on > send:
counter += 1
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yield counter, position, (send-sini)/total