def accept_proposed_rate(request, shared_data):
# this is node_to_confirm's account
acct = Account.objects.get(shared_data=shared_data,
owner__pk=shared_data.node_to_confirm_id)
pmt = None
if acct.getBalance(
) and shared_data.interest_rate: # otherwise no update necessary
pmt = Payment(payer=acct.owner,
payer_email=acct.owner.getPrimaryEmail(),
recipient=acct.partner,
recipient_email=acct.partner.getPrimaryEmail(),
currency=shared_data.currency,
amount=0.0,
status='PE',
description='Interest rate change: %s%% to %s%%.' % \
(shared_data.displayRate(), shared_data.displayProposedRate()))
pmt.save() # set pmt time
#pmt = Payment.objects.get(pk=pmt.id) # reload because django doesn't update date that is auto-set on save
interest = computeInterest(acct.getBalance(),
shared_data.interest_rate,
shared_data.last_update, pmt.date)
path = PaymentPath(payment=pmt, amount=pmt.amount)
path.save()
link = PaymentLink(path=path,
payer_account=acct,
position=1,
amount=pmt.amount,
interest=-interest,
interest_rate=shared_data.interest_rate)
link.save()
shared_data.balance += interest * acct.balance_multiplier
if pmt:
shared_data.last_update = pmt.date
else:
shared_data.last_update = datetime.datetime.now()
shared_data.interest_rate = shared_data.proposed_rate
shared_data.proposed_rate = None
shared_data.node_to_confirm_id = None
shared_data.save()
if pmt: # could do this initially now that this is wrapped in a transaction
pmt.status = 'OK'
pmt.save()
t = template_loader.get_template('emailAcceptRateProposal.txt')
c = RequestContext(request, {'acct': acct.get_partner_acct()})
sendEmail("Interest rate proposal accepted", t.render(c),
acct.partner.getPrimaryEmail())
def testAccountIntegrity():
for shared in SharedAccountData.objects.all():
#print "\n*** %s ***" % shared
acctCurrency = shared.currency
fwdAcct = Account.objects.get(shared_data=shared, balance_multiplier=1)
bwdAcct = Account.objects.get(shared_data=shared, balance_multiplier=-1)
if fwdAcct.getBalanceNoInterest() < -fwdAcct.iou_limit - ERROR:
print 'Account %d over limit: Balance %.12f, Limit %.12f.' % \
(fwdAcct.id, fwdAcct.getBalanceNoInterest(), -fwdAcct.iou_limit)
if bwdAcct.getBalanceNoInterest() < -bwdAcct.iou_limit - ERROR:
print 'Account %d over limit: Balance %.12f, Limit %.12f.' % \
(bwdAcct.id, bwdAcct.getBalanceNoInterest(), -bwdAcct.iou_limit)
tally = 0.0
last_date = None
for link in PaymentLink.objects.filter(payer_account__id__in=(fwdAcct.id, bwdAcct.id)
).extra(select={'date': 'pmt.date'},
tables=('ripple_payment as pmt', 'ripple_paymentpath as path'),
where=('path.payment_id=pmt.id', 'path.id=ripple_paymentlink.path_id')
).order_by('date', 'id'):
path = link.path
payment = path.payment
acct = link.payer_account
#print "%d: %.12f (%.12f/%.3f) on %s = %.12f" % \
# (link.id, link.amount, link.interest, link.interest_rate, payment.date, tally)
interest = 0.0
if last_date: # skip first transaction on account because balance/interest are zero
pathAmount = path.amount
if acctCurrency.value:
pathAmount *= payment.currency.value / acctCurrency.value
interest = computeInterest(tally * acct.balance_multiplier, link.interest_rate, last_date, payment.date)
if abs(interest + link.interest) > .5e-12: # should be exact, not sure why sometimes get errors here
print "Link %d: incorrect interest.\n\tBalance: %.14f.\n\tCorrect value: %.20f\n\tRecorded %.12f" % \
(link.id, tally, interest, -link.interest)
if abs(pathAmount - link.amount) > 1e-12:
print "Link %d: incorrect amount. Correct value: %.20f, recorded %.12f" % \
(link.id, pathAmount, link.amount)
else:
if link.interest != 0.0:
print "Link %d: first transaction interest not zero. (%.12f)" % (link.id, link.interest)
last_date = payment.date
tally -= (link.amount + link.interest) * acct.balance_multiplier
if abs(tally - shared.balance) > ERROR: # sometimes this is not quite exact either, maybe due to summing rouding errors?
print 'Shared account %d doesn\'t balance with transaction total. Balance: %.12f, Transactions: %.12f.' % \
(shared.id, shared.balance, tally)
def accept_proposed_rate(request, shared_data):
# this is node_to_confirm's account
acct = Account.objects.get(shared_data=shared_data, owner__pk=shared_data.node_to_confirm_id)
pmt = None
if acct.getBalance() and shared_data.interest_rate: # otherwise no update necessary
pmt = Payment(payer=acct.owner,
payer_email=acct.owner.getPrimaryEmail(),
recipient=acct.partner,
recipient_email=acct.partner.getPrimaryEmail(),
currency=shared_data.currency,
amount=0.0,
status='PE',
description='Interest rate change: %s%% to %s%%.' % \
(shared_data.displayRate(), shared_data.displayProposedRate()))
pmt.save() # set pmt time
#pmt = Payment.objects.get(pk=pmt.id) # reload because django doesn't update date that is auto-set on save
interest = computeInterest(acct.getBalance(), shared_data.interest_rate, shared_data.last_update, pmt.date)
path = PaymentPath(payment=pmt, amount=pmt.amount)
path.save()
link = PaymentLink(path=path, payer_account=acct, position=1,
amount=pmt.amount, interest=-interest,
interest_rate=shared_data.interest_rate)
link.save()
shared_data.balance += interest * acct.balance_multiplier
if pmt:
shared_data.last_update = pmt.date
else:
shared_data.last_update = datetime.datetime.now()
shared_data.interest_rate = shared_data.proposed_rate
shared_data.proposed_rate = None
shared_data.node_to_confirm_id = None
shared_data.save()
if pmt: # could do this initially now that this is wrapped in a transaction
pmt.status = 'OK'
pmt.save()
t = template_loader.get_template('emailAcceptRateProposal.txt')
c = RequestContext(request, {'acct': acct.get_partner_acct()})
sendEmail("Interest rate proposal accepted", t.render(c), acct.partner.getPrimaryEmail())
def payAlongPath(path, amount, cursor, pmt):
# use only transaction-safe DB values - means re-get necessary data
pathCredit = amount
MULTIPLIER, IOU_LIMIT, BALANCE, INTEREST_RATE, LAST_UPDATE, CURR_VALUE = range(
6) # indexes on querySql row
querySql = "SELECT acct.balance_multiplier, acct.iou_limit, shared.balance, shared.interest_rate, shared.last_update, curr.value \
FROM ripple_account as acct JOIN ripple_sharedaccountdata as shared ON shared.id = acct.shared_data_id \
JOIN ripple_currencyunit as curr ON curr.id = shared.currency_id WHERE acct.id = %d"
valueSql = "SELECT value FROM ripple_currencyunit WHERE id = %d"
# first, get value of pmt currency
cursor.execute(valueSql, (pmt.currency_id, ))
valueRow = cursor.fetchone()
pmt.currencyValue = valueRow[0] # value
# next, get acct info for each acct in path and use to determine path credit
for acct in path[1:len(path):2]: # accts are at odd indices in path
# get acct info
cursor.execute(querySql, (acct.id, ))
queryRow = cursor.fetchone()
# calculate avail credit (in pmt units)
acct.actual_balance = queryRow[BALANCE] * queryRow[MULTIPLIER]
acct.last_update = queryRow[LAST_UPDATE]
# *** causing errors when only one simultaneous payment happening
# this is because of django timezone setting -- unset it? (works on windows)
if acct.last_update > pmt.date: # can't properly compute interest if someone else already has since the time this payment was supposed to occur at
print acct.last_update, pmt.date
raise PaymentError(
code=TX_COLLISION,
message=
"Another transaction updated this account since the time we wanted to pay at.",
retry=True)
acct.interest = computeInterest(acct.actual_balance,
queryRow[INTEREST_RATE],
acct.last_update, pmt.date)
acct.eff_balance = acct.actual_balance + acct.interest
acct.availCredit = queryRow[IOU_LIMIT] + acct.eff_balance
if pmt.currencyValue: # otherwise, no conversions
# get acct currency conversion value
acct.currencyValue = queryRow[CURR_VALUE]
# calculate available credit in pmt units
acct.availCredit *= acct.currencyValue / pmt.currencyValue # convert to pmt units
acct.availCredit = float(
"%.12f" % acct.availCredit
) # round path's amount to 12 decimal places so all paths add exactly to the total payment amount in db
if acct.availCredit < pathCredit:
pathCredit = acct.availCredit
# check that pathCredit doesn't convert back too high, otherwise updating balance may fail
# **** occasionally causing minute amounts of payment to not go through on predicted number of paths
# **** instead, allow for minute amounts over limit
##if pmt.currencyValue: # only check if we're doing conversions
## roundBack = pathCredit * pmt.currencyValue / acct.currencyValue
## roundBack = float("%.12f" % roundBack)
## if roundBack > pathCredit:
## pathCredit -= 0.000000000001 # twelve digits down, subtract one
if pathCredit <= 0: return 0 # no credit, no payment along this path
# insert Path into database
sql = "INSERT INTO ripple_paymentpath (payment_id, amount) VALUES (%d, %.12f);"
sql += "SELECT currval('ripple_paymentpath_id_seq');" # at the same time get the ID of the path we just inserted
cursor.execute(sql, (pmt.id, pathCredit))
# find ID of path we just inserted
pathId = cursor.fetchone()[0]
# make payments
linkInsSql = "INSERT INTO ripple_paymentlink (path_id, payer_account_id, position, amount, interest, interest_rate) "
linkInsSql += "VALUES (%d, %d, %d, %.12f, %.12f, %.10f);"
##linkInsSql += "SELECT currval('ripple_paymentlink_id_seq');"
position = 1 # start link position sequence at 1
balUpdSql = "UPDATE ripple_sharedaccountdata SET balance = balance - %.14f, last_update = '%s' "
balUpdSql += "WHERE ripple_sharedaccountdata.id = %d "
#balUpdSql += "AND last_update = '%s' " # make sure last_update stays consistent, otherwise interest won't work.
balUpdSql += "AND last_update - '%s' <= INTERVAL '0:0:0.000001' " # alternative version because psycopg sometimes loses a microsecond!
balUpdSql += "AND balance * %d >= %.14f" # % balance_multiplier, minimum balance needed for payment to succeed
# makes sure there's enough, even if another transaction has fudged around!
# above WHERE conditions allow us to use Postgresql in Read Committed (default) mode - see http://www.postgresql.org/files/developer/transactions.pdf
# *** could do further real-time safety checking on acct.iou_limit too, to be really sure :) ***
for acct in path[1:len(path):2]:
# insert PaymentLink
linkAmount = pathCredit
if pmt.currencyValue:
linkAmount *= pmt.currencyValue / acct.currencyValue # convert path amount to acct units
cursor.execute(
linkInsSql,
(pathId, acct.id, position, linkAmount, -acct.interest,
acct.sharedData.interest_rate
)) # negative interest because this is an outgoing amount
if not cursor.rowcount == 1:
raise PaymentError(
code=LINK_INSERT_FAILED,
message="Error inserting path link to database.",
retry=True) # shouldn't happen
##print 'Link %d:' % cursor.fetchone()[0] ###
##print '\tAmount: %.14f' % linkAmount
##print '\tBalance: %.14f -> %.14f' % (acct.actual_balance, acct.actual_balance - (linkAmount - acct.interest))
##print '\tInterest: %.14f' % -acct.interest
position = position + 1
# update SharedAccountData balance
# **** 10e-12 = allow for a minute amount over limit due to rounding error in conversion
balChange = linkAmount - acct.interest
cursor.execute(
balUpdSql,
(balChange * acct.balance_multiplier, pmt.date,
acct.shared_data_id, acct.last_update, acct.balance_multiplier,
balChange - acct.iou_limit - 10e-12))
if not cursor.rowcount == 1:
shared = SharedAccountData.objects.get(
pk=acct.shared_data_id
) # find out actual balance, last_update in db
raise PaymentError(code=BAL_UPDATE_FAILED, # happens if sql conditions fail, great for concurrent transactions!
message="Error updating account balance in database. SQL: " + \
balUpdSql % (balChange * acct.balance_multiplier, str(pmt.date), acct.shared_data_id, acct.last_update, \
acct.balance_multiplier, balChange - acct.iou_limit - 1e-12) + \
"\nActual balance: %.14f (expected: %.14f)\nIOU limit: %.2f\nLast update: %s (expected %s)" % \
(shared.balance, acct.actual_balance * acct.balance_multiplier, acct.iou_limit, shared.last_update, acct.last_update),
retry=True)
return pathCredit
def payAlongPath(path, amount, cursor, pmt):
# use only transaction-safe DB values - means re-get necessary data
pathCredit = amount
MULTIPLIER, IOU_LIMIT, BALANCE, INTEREST_RATE, LAST_UPDATE, CURR_VALUE = range(6) # indexes on querySql row
querySql = "SELECT acct.balance_multiplier, acct.iou_limit, shared.balance, shared.interest_rate, shared.last_update, curr.value \
FROM ripple_account as acct JOIN ripple_sharedaccountdata as shared ON shared.id = acct.shared_data_id \
JOIN ripple_currencyunit as curr ON curr.id = shared.currency_id WHERE acct.id = %d"
valueSql = "SELECT value FROM ripple_currencyunit WHERE id = %d"
# first, get value of pmt currency
cursor.execute(valueSql, (pmt.currency_id,))
valueRow = cursor.fetchone()
pmt.currencyValue = valueRow[0] # value
# next, get acct info for each acct in path and use to determine path credit
for acct in path[1:len(path):2]: # accts are at odd indices in path
# get acct info
cursor.execute(querySql, (acct.id,))
queryRow = cursor.fetchone()
# calculate avail credit (in pmt units)
acct.actual_balance = queryRow[BALANCE] * queryRow[MULTIPLIER]
acct.last_update = queryRow[LAST_UPDATE]
# *** causing errors when only one simultaneous payment happening
# this is because of django timezone setting -- unset it? (works on windows)
if acct.last_update > pmt.date: # can't properly compute interest if someone else already has since the time this payment was supposed to occur at
print acct.last_update, pmt.date
raise PaymentError(code=TX_COLLISION, message="Another transaction updated this account since the time we wanted to pay at.", retry=True)
acct.interest = computeInterest(acct.actual_balance, queryRow[INTEREST_RATE], acct.last_update, pmt.date)
acct.eff_balance = acct.actual_balance + acct.interest
acct.availCredit = queryRow[IOU_LIMIT] + acct.eff_balance
if pmt.currencyValue: # otherwise, no conversions
# get acct currency conversion value
acct.currencyValue = queryRow[CURR_VALUE]
# calculate available credit in pmt units
acct.availCredit *= acct.currencyValue / pmt.currencyValue # convert to pmt units
acct.availCredit = float("%.12f" % acct.availCredit) # round path's amount to 12 decimal places so all paths add exactly to the total payment amount in db
if acct.availCredit < pathCredit:
pathCredit = acct.availCredit
# check that pathCredit doesn't convert back too high, otherwise updating balance may fail
# **** occasionally causing minute amounts of payment to not go through on predicted number of paths
# **** instead, allow for minute amounts over limit
##if pmt.currencyValue: # only check if we're doing conversions
## roundBack = pathCredit * pmt.currencyValue / acct.currencyValue
## roundBack = float("%.12f" % roundBack)
## if roundBack > pathCredit:
## pathCredit -= 0.000000000001 # twelve digits down, subtract one
if pathCredit <= 0: return 0 # no credit, no payment along this path
# insert Path into database
sql = "INSERT INTO ripple_paymentpath (payment_id, amount) VALUES (%d, %.12f);"
sql += "SELECT currval('ripple_paymentpath_id_seq');" # at the same time get the ID of the path we just inserted
cursor.execute(sql, (pmt.id, pathCredit))
# find ID of path we just inserted
pathId = cursor.fetchone()[0]
# make payments
linkInsSql = "INSERT INTO ripple_paymentlink (path_id, payer_account_id, position, amount, interest, interest_rate) "
linkInsSql += "VALUES (%d, %d, %d, %.12f, %.12f, %.10f);"
##linkInsSql += "SELECT currval('ripple_paymentlink_id_seq');"
position = 1 # start link position sequence at 1
balUpdSql = "UPDATE ripple_sharedaccountdata SET balance = balance - %.14f, last_update = '%s' "
balUpdSql += "WHERE ripple_sharedaccountdata.id = %d "
#balUpdSql += "AND last_update = '%s' " # make sure last_update stays consistent, otherwise interest won't work.
balUpdSql += "AND last_update - '%s' <= INTERVAL '0:0:0.000001' " # alternative version because psycopg sometimes loses a microsecond!
balUpdSql += "AND balance * %d >= %.14f" # % balance_multiplier, minimum balance needed for payment to succeed
# makes sure there's enough, even if another transaction has fudged around!
# above WHERE conditions allow us to use Postgresql in Read Committed (default) mode - see http://www.postgresql.org/files/developer/transactions.pdf
# *** could do further real-time safety checking on acct.iou_limit too, to be really sure :) ***
for acct in path[1:len(path):2]:
# insert PaymentLink
linkAmount = pathCredit
if pmt.currencyValue:
linkAmount *= pmt.currencyValue / acct.currencyValue # convert path amount to acct units
cursor.execute(linkInsSql, (pathId, acct.id, position, linkAmount, -acct.interest, acct.sharedData.interest_rate)) # negative interest because this is an outgoing amount
if not cursor.rowcount == 1:
raise PaymentError(code=LINK_INSERT_FAILED, message="Error inserting path link to database.", retry=True) # shouldn't happen
##print 'Link %d:' % cursor.fetchone()[0] ###
##print '\tAmount: %.14f' % linkAmount
##print '\tBalance: %.14f -> %.14f' % (acct.actual_balance, acct.actual_balance - (linkAmount - acct.interest))
##print '\tInterest: %.14f' % -acct.interest
position = position + 1
# update SharedAccountData balance
# **** 10e-12 = allow for a minute amount over limit due to rounding error in conversion
balChange = linkAmount - acct.interest
cursor.execute(balUpdSql, (balChange * acct.balance_multiplier, pmt.date, acct.shared_data_id,
acct.last_update, acct.balance_multiplier, balChange - acct.iou_limit - 10e-12))
if not cursor.rowcount == 1:
shared = SharedAccountData.objects.get(pk=acct.shared_data_id) # find out actual balance, last_update in db
raise PaymentError(code=BAL_UPDATE_FAILED, # happens if sql conditions fail, great for concurrent transactions!
message="Error updating account balance in database. SQL: " + \
balUpdSql % (balChange * acct.balance_multiplier, str(pmt.date), acct.shared_data_id, acct.last_update, \
acct.balance_multiplier, balChange - acct.iou_limit - 1e-12) + \
"\nActual balance: %.14f (expected: %.14f)\nIOU limit: %.2f\nLast update: %s (expected %s)" % \
(shared.balance, acct.actual_balance * acct.balance_multiplier, acct.iou_limit, shared.last_update, acct.last_update),
retry=True)
return pathCredit
