def attempt(self):
"""
Try to perform this payment.
"""
self.last_attempted_at = datetime.now()
# Write attempted date now so if something happens we can see this
# payment was interrupted.
self.save()
changed_accounts = []
try:
flow_graph = FlowGraph(self.payer, self.recipient)
flow_links = flow_graph.min_cost_flow(self.amount)
with transaction.atomic(using='ripple'):
for creditline_id, amount in flow_links:
creditline = CreditLine.objects.get(pk=creditline_id)
Entry.objects.create_entry(self, creditline.account,
-amount * creditline.bal_mult,
creditline.limit)
changed_accounts.append(creditline.account)
self.status = 'completed'
self.save()
except BaseException as exc:
# TODO: Handle collisions better here so we can retry or give the
# user an informative error message, rather than the server error page.
self.status = 'failed'
self.save()
if not isinstance(exc, PaymentError):
raise
# Update cached graphs.
for account in changed_accounts:
for creditline in (account.pos_creditline, account.neg_creditline):
update_creditline_in_cached_graphs(creditline)
def attempt(self):
"""
Try to perform this payment.
"""
self.last_attempted_at = datetime.now()
# Write attempted date now so if something happens we can see this
# payment was interrupted.
self.save()
changed_accounts = []
try:
flow_graph = FlowGraph(self.payer, self.recipient)
flow_links = flow_graph.min_cost_flow(self.amount)
with transaction.commit_on_success(using="ripple"):
for creditline_id, amount in flow_links:
creditline = CreditLine.objects.get(pk=creditline_id)
Entry.objects.create_entry(
self, creditline.account, -amount * creditline.bal_mult, creditline.limit
)
changed_accounts.append(creditline.account)
self.status = "completed"
self.save()
except BaseException as exc:
# TODO: Handle collisions better here so we can retry or give the
# user an informative error message, rather than the server error page.
self.status = "failed"
self.save()
if not isinstance(exc, PaymentError):
raise
# Update cached graphs.
for account in changed_accounts:
for creditline in (account.pos_creditline, account.neg_creditline):
update_creditline_in_cached_graphs(creditline)
def post_delete(cls, sender, instance, **kwargs):
# Delete partner creditline and account itself.
instance.account.delete()
# Remove from cached flow graph.
from cc.payment import flow
# TODO: Call from single external process -- not threadsafe!
flow.update_creditline_in_cached_graphs(instance)
def post_delete(cls, sender, instance, **kwargs):
# Delete partner creditline and account itself.
instance.account.delete()
# Remove from cached flow graph.
from cc.payment import flow
# TODO: Call from single external process -- not threadsafe!
flow.update_creditline_in_cached_graphs(instance)
def post_save(cls, sender, instance, created, **kwargs):
if created:
# Newly-created creditlines may not have a partner yet,
# so updating them will blow up. Update new creditlines
# manually.
return
from cc.payment import flow
# TODO: Call from single external process -- not threadsafe!
flow.update_creditline_in_cached_graphs(instance)
def post_save(cls, sender, instance, created, **kwargs):
if created:
# Newly-created creditlines may not have a partner yet,
# so updating them will blow up. Update new creditlines
# manually.
return
from cc.payment import flow
# TODO: Call from single external process -- not threadsafe!
flow.update_creditline_in_cached_graphs(instance)
def post_delete(cls, sender, instance, **kwargs):
# Delete partner creditline and account itself.
try:
instance.account.delete()
except Account.DoesNotExist:
pass
# Remove from cached flow graph.
from cc.payment import flow
# TODO: Call from single external process -- not threadsafe!
# XXX: This is broken - tries to load partner creditline, which
# may already be (is?) deleted.
flow.update_creditline_in_cached_graphs(instance)
def create_account(self, node1, node2):
"""
Create account between two nodes.
Also creates the required CreditLine records.
"""
acct = self.create()
pos_cl = CreditLine.objects.create(account=acct, node=node1, bal_mult=1)
neg_cl = CreditLine.objects.create(account=acct, node=node2, bal_mult=-1)
# Manually update new creditlines in cached graphs.
from cc.payment import flow
flow.update_creditline_in_cached_graphs(pos_cl)
flow.update_creditline_in_cached_graphs(neg_cl)
return acct
def post_delete(cls, sender, instance, **kwargs):
# Delete partner creditline and account itself.
try:
instance.account.delete()
except Account.DoesNotExist:
pass
# Remove from cached flow graph.
from cc.payment import flow
# TODO: Call from single external process -- not threadsafe!
# XXX: This is broken - tries to load partner creditline, which
# may already be (is?) deleted.
flow.update_creditline_in_cached_graphs(instance)
def create_account(self, node1, node2):
"""
Create account between two nodes.
Also creates the required CreditLine records.
"""
acct = self.create()
pos_cl = CreditLine.objects.create(
account=acct, node=node1, bal_mult=1)
neg_cl = CreditLine.objects.create(
account=acct, node=node2, bal_mult=-1)
# Manually update new creditlines in cached graphs.
from cc.payment import flow
flow.update_creditline_in_cached_graphs(pos_cl)
flow.update_creditline_in_cached_graphs(neg_cl)
return acct
