def sequence_block_recursive(self,
parent_block_data,
parent_sequenced_block_data=None):
harvester = PolkascanHarvesterService(self.session,
type_registry=TYPE_REGISTRY)
harvester.metadata_store = self.metadata_store
for nr in range(0, 10):
if not parent_sequenced_block_data:
# No block ever sequenced, check if chain is at genesis state
block = Block.query(self.session).order_by('id').first()
if block.id == 1:
# Add genesis block
block = harvester.add_block(block.parent_hash)
if block.id != 0:
return {'error': 'Chain not at genesis'}
harvester.process_genesis(block)
block_id = 0
else:
block_id = parent_sequenced_block_data['id'] + 1
block = Block.query(self.session).get(block_id)
if block:
try:
sequenced_block = harvester.sequence_block(
block, parent_block_data, parent_sequenced_block_data)
self.session.commit()
parent_block_data = block.asdict()
parent_sequenced_block_data = sequenced_block.asdict()
if nr == 9 or not sequenced_block:
if sequenced_block:
if nr == 9:
sequence_block_recursive.delay(
parent_block_data, parent_sequenced_block_data)
return {'processedBlockId': block.id, 'amount': nr + 1}
except IntegrityError as e:
return {
'error': 'Sequencer already started',
'exception': str(e)
}
else:
return {'error': 'Block {} not found'.format(block_id)}
def on_post(self, req, resp):
harvester = PolkascanHarvesterService(self.session,
type_registry=TYPE_REGISTRY)
block = Block.query(self.session).get(1)
if block:
result = harvester.process_genesis(block=block)
else:
result = 'Block #1 required to process genesis'
self.session.commit()
resp.media = {'result': result}
