def ready(self):
# We try until success if dev mode, if it fails the backend will not start
# In production we let this app fails
while True:
try:
# args is set to empty because fabric-sdk-py doesn't allow None args for invoke operations
invoke_ledger(fcn='registerNode', args=[''], sync=True)
except RpcError as e:
if not settings.DEBUG:
raise
logger.exception(e)
time.sleep(5)
logger.info('Retry to register the node to the ledger')
else:
logger.info('Node registered in the ledger')
return
def cancel(self, request, pk):
validate_pk(pk)
try:
compute_plan = invoke_ledger(fcn='cancelComputePlan',
args={'key': pk},
only_pkhash=False)
except LedgerError as e:
return Response({'message': str(e.msg)}, status=e.status)
return Response(compute_plan, status=status.HTTP_200_OK)
def create_ledger_assets(model, fcn, args, pkhashes, sync=False):
try:
instances = model.objects.filter(pk__in=pkhashes)
except ObjectDoesNotExist:
instances = None
try:
data = invoke_ledger(fcn=fcn, args=args, sync=sync)
except LedgerTimeout:
# LedgerTimeout herits from LedgerError do not delete
# In case of timeout we keep the instances if it exists
raise
except LedgerError:
# if not created on ledger, delete from local db
if instances:
instances.delete()
raise
if instances:
instances.update(validated=True)
data['validated'] = True
return data
def create_ledger_asset(model, fcn, args, pkhash, sync=False):
try:
instance = model.objects.get(pk=pkhash)
except ObjectDoesNotExist:
instance = None
try:
data = invoke_ledger(fcn=fcn, args=args, sync=sync)
except LedgerTimeout:
# LedgerTimeout herits from LedgerError do not delete
# In case of timeout we keep the instance if it exists
raise
except LedgerError:
# if not created on ledger, delete from local db
if instance:
instance.delete()
raise
if instance:
instance.validated = True
instance.save()
data['validated'] = True
return data
def createLedgerAggregateTuple(args, sync=False):
return invoke_ledger(fcn='createAggregatetuple', args=args, sync=sync)
def updateLedgerDataSample(args, sync=False):
return invoke_ledger(fcn='updateDataSample', args=args, sync=sync)
def createLedgerTesttuple(args, sync=False):
return invoke_ledger(fcn='createTesttuple', args=args, sync=sync)
def createLedgerComputePlan(args, sync=False):
return invoke_ledger(fcn='createComputePlan', args=args, sync=sync, only_pkhash=False)
def updateLedgerDataManager(args, sync=False):
return invoke_ledger(fcn='updateDataManager', args=args, sync=sync)
def createLedgerCompositeTraintuple(args, sync=False):
return invoke_ledger(fcn='createCompositeTraintuple', args=args, sync=sync)