class PolkascanHarvesterService(BaseService):
def __init__(self, db_session, type_registry='default', type_registry_file=None):
self.db_session = db_session
if type_registry_file:
custom_type_registry = load_type_registry_file(type_registry_file)
else:
custom_type_registry = None
self.substrate = SubstrateInterface(
url=settings.SUBSTRATE_RPC_URL,
type_registry=custom_type_registry,
type_registry_preset=type_registry
)
self.metadata_store = {}
def process_genesis(self, block):
# Set block time of parent block
child_block = Block.query(self.db_session).filter_by(parent_hash=block.hash).first()
block.set_datetime(child_block.datetime)
# Retrieve genesis accounts
if settings.get_versioned_setting('SUBSTRATE_STORAGE_INDICES', block.spec_version_id) == 'Accounts':
# Get accounts from storage keys
storage_key_prefix = self.substrate.generate_storage_hash(
storage_module='System',
storage_function='Account',
metadata_version=settings.SUBSTRATE_METADATA_VERSION
)
rpc_result = self.substrate.rpc_request(
'state_getKeys',
[storage_key_prefix, block.hash]
).get('result')
# Extract accounts from storage key
genesis_accounts = [storage_key[-64:] for storage_key in rpc_result if len(storage_key) == 162]
for account_id in genesis_accounts:
account_audit = AccountAudit(
account_id=account_id,
block_id=block.id,
extrinsic_idx=None,
event_idx=None,
type_id=settings.ACCOUNT_AUDIT_TYPE_NEW
)
account_audit.save(self.db_session)
elif settings.get_versioned_setting('SUBSTRATE_STORAGE_INDICES', block.spec_version_id) == 'EnumSet':
genesis_account_page_count = self.substrate.get_runtime_state(
module="Indices",
storage_function="NextEnumSet",
block_hash=block.hash
).get('result', 0)
# Get Accounts on EnumSet
block.count_accounts_new = 0
block.count_accounts = 0
for enum_set_nr in range(0, genesis_account_page_count + 1):
genesis_accounts = self.substrate.get_runtime_state(
module="Indices",
storage_function="EnumSet",
params=[enum_set_nr],
block_hash=block.hash
).get('result')
if genesis_accounts:
block.count_accounts_new += len(genesis_accounts)
block.count_accounts += len(genesis_accounts)
for idx, account_id in enumerate(genesis_accounts):
account_audit = AccountAudit(
account_id=account_id.replace('0x', ''),
block_id=block.id,
extrinsic_idx=None,
event_idx=None,
type_id=settings.ACCOUNT_AUDIT_TYPE_NEW
)
account_audit.save(self.db_session)
account_index_id = enum_set_nr * 64 + idx
account_index_audit = AccountIndexAudit(
account_index_id=account_index_id,
account_id=account_id.replace('0x', ''),
block_id=block.id,
extrinsic_idx=None,
event_idx=None,
type_id=settings.ACCOUNT_INDEX_AUDIT_TYPE_NEW
)
account_index_audit.save(self.db_session)
block.save(self.db_session)
# Add hardcoded account like treasury stored in settings
for account_id in settings.SUBSTRATE_TREASURY_ACCOUNTS:
account_audit = AccountAudit(
account_id=account_id,
block_id=block.id,
extrinsic_idx=None,
event_idx=None,
data={'is_treasury': True},
type_id=settings.ACCOUNT_AUDIT_TYPE_NEW
)
account_audit.save(self.db_session)
# Check for sudo accounts
try:
# Update sudo key
sudo_key = self.substrate.get_runtime_state(
module='Sudo',
storage_function='Key',
block_hash=block.hash
).get('result')
account_audit = AccountAudit(
account_id=sudo_key.replace('0x', ''),
block_id=block.id,
extrinsic_idx=None,
event_idx=None,
data={'is_sudo': True},
type_id=settings.ACCOUNT_AUDIT_TYPE_NEW
)
account_audit.save(self.db_session)
except ValueError:
pass
# Create initial session
initial_session_event = NewSessionEventProcessor(
block=block, event=Event(), substrate=self.substrate
)
if settings.get_versioned_setting('NEW_SESSION_EVENT_HANDLER', block.spec_version_id):
initial_session_event.add_session(db_session=self.db_session, session_id=0)
else:
initial_session_event.add_session_old(db_session=self.db_session, session_id=0)
def process_metadata(self, spec_version, block_hash):
# Check if metadata already in store
if spec_version not in self.metadata_store:
print('Metadata: CACHE MISS', spec_version)
runtime_version_data = self.substrate.get_block_runtime_version(block_hash)
runtime = Runtime.query(self.db_session).get(spec_version)
if runtime:
self.metadata_store[spec_version] = self.substrate.get_block_metadata(block_hash=block_hash)
else:
self.db_session.begin(subtransactions=True)
try:
# Store metadata in database
runtime = Runtime(
id=spec_version,
impl_name=runtime_version_data["implName"],
impl_version=runtime_version_data["implVersion"],
spec_name=runtime_version_data["specName"],
spec_version=spec_version,
json_metadata=str(self.substrate.metadata_decoder.data),
json_metadata_decoded=self.substrate.metadata_decoder.value,
apis=runtime_version_data["apis"],
authoring_version=runtime_version_data["authoringVersion"],
count_call_functions=0,
count_events=0,
count_modules=len(self.substrate.metadata_decoder.metadata.modules),
count_storage_functions=0,
count_constants=0,
count_errors=0
)
runtime.save(self.db_session)
print('store version to db', self.substrate.metadata_decoder.version)
for module in self.substrate.metadata_decoder.metadata.modules:
# Check if module exists
if RuntimeModule.query(self.db_session).filter_by(
spec_version=spec_version,
module_id=module.get_identifier()
).count() == 0:
module_id = module.get_identifier()
else:
module_id = '{}_1'.format(module.get_identifier())
# Storage backwards compt check
if module.storage and isinstance(module.storage, list):
storage_functions = module.storage
elif module.storage and isinstance(getattr(module.storage, 'value'), dict):
storage_functions = module.storage.items
else:
storage_functions = []
runtime_module = RuntimeModule(
spec_version=spec_version,
module_id=module_id,
prefix=module.prefix,
name=module.name,
count_call_functions=len(module.calls or []),
count_storage_functions=len(storage_functions),
count_events=len(module.events or []),
count_constants=len(module.constants or []),
count_errors=len(module.errors or []),
)
runtime_module.save(self.db_session)
# Update totals in runtime
runtime.count_call_functions += runtime_module.count_call_functions
runtime.count_events += runtime_module.count_events
runtime.count_storage_functions += runtime_module.count_storage_functions
runtime.count_constants += runtime_module.count_constants
runtime.count_errors += runtime_module.count_errors
if len(module.calls or []) > 0:
for idx, call in enumerate(module.calls):
runtime_call = RuntimeCall(
spec_version=spec_version,
module_id=module_id,
call_id=call.get_identifier(),
index=idx,
name=call.name,
lookup=call.lookup,
documentation='\n'.join(call.docs),
count_params=len(call.args)
)
runtime_call.save(self.db_session)
for arg in call.args:
runtime_call_param = RuntimeCallParam(
runtime_call_id=runtime_call.id,
name=arg.name,
type=arg.type
)
runtime_call_param.save(self.db_session)
if len(module.events or []) > 0:
for event_index, event in enumerate(module.events):
runtime_event = RuntimeEvent(
spec_version=spec_version,
module_id=module_id,
event_id=event.name,
index=event_index,
name=event.name,
lookup=event.lookup,
documentation='\n'.join(event.docs),
count_attributes=len(event.args)
)
runtime_event.save(self.db_session)
for arg_index, arg in enumerate(event.args):
runtime_event_attr = RuntimeEventAttribute(
runtime_event_id=runtime_event.id,
index=arg_index,
type=arg
)
runtime_event_attr.save(self.db_session)
if len(storage_functions) > 0:
for idx, storage in enumerate(storage_functions):
# Determine type
type_hasher = None
type_key1 = None
type_key2 = None
type_value = None
type_is_linked = None
type_key2hasher = None
if storage.type.get('PlainType'):
type_value = storage.type.get('PlainType')
elif storage.type.get('MapType'):
type_hasher = storage.type['MapType'].get('hasher')
type_key1 = storage.type['MapType'].get('key')
type_value = storage.type['MapType'].get('value')
type_is_linked = storage.type['MapType'].get('isLinked', False)
elif storage.type.get('DoubleMapType'):
type_hasher = storage.type['DoubleMapType'].get('hasher')
type_key1 = storage.type['DoubleMapType'].get('key1')
type_key2 = storage.type['DoubleMapType'].get('key2')
type_value = storage.type['DoubleMapType'].get('value')
type_key2hasher = storage.type['DoubleMapType'].get('key2Hasher')
runtime_storage = RuntimeStorage(
spec_version=spec_version,
module_id=module_id,
index=idx,
name=storage.name,
lookup=None,
default=storage.fallback,
modifier=storage.modifier,
type_hasher=type_hasher,
storage_key=xxh128(module.prefix.encode()) + xxh128(storage.name.encode()),
type_key1=type_key1,
type_key2=type_key2,
type_value=type_value,
type_is_linked=type_is_linked,
type_key2hasher=type_key2hasher,
documentation='\n'.join(storage.docs)
)
runtime_storage.save(self.db_session)
if len(module.constants or []) > 0:
for idx, constant in enumerate(module.constants):
# Decode value
try:
value_obj = ScaleDecoder.get_decoder_class(
constant.type,
ScaleBytes(constant.constant_value)
)
value_obj.decode()
value = value_obj.serialize()
except ValueError:
value = constant.constant_value
except RemainingScaleBytesNotEmptyException:
value = constant.constant_value
except NotImplementedError:
value = constant.constant_value
if type(value) is list or type(value) is dict:
value = json.dumps(value)
runtime_constant = RuntimeConstant(
spec_version=spec_version,
module_id=module_id,
index=idx,
name=constant.name,
type=constant.type,
value=value,
documentation='\n'.join(constant.docs)
)
runtime_constant.save(self.db_session)
if len(module.errors or []) > 0:
for idx, error in enumerate(module.errors):
runtime_error = RuntimeErrorMessage(
spec_version=spec_version,
module_id=module_id,
index=idx,
name=error.name,
documentation='\n'.join(error.docs)
)
runtime_error.save(self.db_session)
runtime.save(self.db_session)
# Process types
for runtime_type_data in list(self.substrate.get_type_registry(block_hash=block_hash).values()):
runtime_type = RuntimeType(
spec_version=runtime_type_data["spec_version"],
type_string=runtime_type_data["type_string"],
decoder_class=runtime_type_data["decoder_class"],
is_primitive_core=runtime_type_data["is_primitive_core"],
is_primitive_runtime=runtime_type_data["is_primitive_runtime"]
)
runtime_type.save(self.db_session)
self.db_session.commit()
# Put in local store
self.metadata_store[spec_version] = self.substrate.metadata_decoder
except SQLAlchemyError as e:
self.db_session.rollback()
def add_block(self, block_hash):
# Check if block is already process
if Block.query(self.db_session).filter_by(hash=block_hash).count() > 0:
raise BlockAlreadyAdded(block_hash)
if settings.SUBSTRATE_MOCK_EXTRINSICS:
self.substrate.mock_extrinsics = settings.SUBSTRATE_MOCK_EXTRINSICS
json_block = self.substrate.get_chain_block(block_hash)
parent_hash = json_block['block']['header'].pop('parentHash')
block_id = json_block['block']['header'].pop('number')
extrinsics_root = json_block['block']['header'].pop('extrinsicsRoot')
state_root = json_block['block']['header'].pop('stateRoot')
digest_logs = json_block['block']['header'].get('digest', {}).pop('logs', None)
# Convert block number to numeric
if not block_id.isnumeric():
block_id = int(block_id, 16)
# ==== Get block runtime from Substrate ==================
self.substrate.init_runtime(block_hash=block_hash)
self.process_metadata(self.substrate.runtime_version, block_hash)
# ==== Get parent block runtime ===================
if block_id > 0:
json_parent_runtime_version = self.substrate.get_block_runtime_version(parent_hash)
parent_spec_version = json_parent_runtime_version.get('specVersion', 0)
self.process_metadata(parent_spec_version, parent_hash)
else:
parent_spec_version = self.substrate.runtime_version
# ==== Set initial block properties =====================
block = Block(
id=block_id,
parent_id=block_id - 1,
hash=block_hash,
parent_hash=parent_hash,
state_root=state_root,
extrinsics_root=extrinsics_root,
count_extrinsics=0,
count_events=0,
count_accounts_new=0,
count_accounts_reaped=0,
count_accounts=0,
count_events_extrinsic=0,
count_events_finalization=0,
count_events_module=0,
count_events_system=0,
count_extrinsics_error=0,
count_extrinsics_signed=0,
count_extrinsics_signedby_address=0,
count_extrinsics_signedby_index=0,
count_extrinsics_success=0,
count_extrinsics_unsigned=0,
count_sessions_new=0,
count_contracts_new=0,
count_log=0,
range10000=math.floor(block_id / 10000),
range100000=math.floor(block_id / 100000),
range1000000=math.floor(block_id / 1000000),
spec_version_id=self.substrate.runtime_version,
logs=digest_logs
)
# Set temp helper variables
block._accounts_new = []
block._accounts_reaped = []
# ==== Get block events from Substrate ==================
extrinsic_success_idx = {}
events = []
try:
events_decoder = self.substrate.get_block_events(block_hash, self.metadata_store[parent_spec_version])
event_idx = 0
for event in events_decoder.elements:
event.value['module_id'] = event.value['module_id'].lower()
model = Event(
block_id=block_id,
event_idx=event_idx,
phase=event.value['phase'],
extrinsic_idx=event.value['extrinsic_idx'],
type=event.value['type'],
spec_version_id=parent_spec_version,
module_id=event.value['module_id'],
event_id=event.value['event_id'],
system=int(event.value['module_id'] == 'system'),
module=int(event.value['module_id'] != 'system'),
attributes=event.value['params'],
codec_error=False
)
# Process event
if event.value['phase'] == 0:
block.count_events_extrinsic += 1
elif event.value['phase'] == 1:
block.count_events_finalization += 1
if event.value['module_id'] == 'system':
block.count_events_system += 1
# Store result of extrinsic
if event.value['event_id'] == 'ExtrinsicSuccess':
extrinsic_success_idx[event.value['extrinsic_idx']] = True
block.count_extrinsics_success += 1
if event.value['event_id'] == 'ExtrinsicFailed':
extrinsic_success_idx[event.value['extrinsic_idx']] = False
block.count_extrinsics_error += 1
else:
block.count_events_module += 1
model.save(self.db_session)
events.append(model)
event_idx += 1
block.count_events = len(events_decoder.elements)
except SubstrateRequestException:
block.count_events = 0
# === Extract extrinsics from block ====
extrinsics_data = json_block['block'].pop('extrinsics')
block.count_extrinsics = len(extrinsics_data)
extrinsic_idx = 0
extrinsics = []
for extrinsic in extrinsics_data:
extrinsics_decoder = ExtrinsicsDecoder(
data=ScaleBytes(extrinsic),
metadata=self.metadata_store[parent_spec_version]
)
extrinsic_data = extrinsics_decoder.decode()
# Lookup result of extrinsic
extrinsic_success = extrinsic_success_idx.get(extrinsic_idx, False)
model = Extrinsic(
block_id=block_id,
extrinsic_idx=extrinsic_idx,
extrinsic_hash=extrinsics_decoder.extrinsic_hash,
extrinsic_length=extrinsic_data.get('extrinsic_length'),
extrinsic_version=extrinsic_data.get('version_info'),
signed=extrinsics_decoder.contains_transaction,
unsigned=not extrinsics_decoder.contains_transaction,
signedby_address=bool(extrinsics_decoder.contains_transaction and extrinsic_data.get('account_id')),
signedby_index=bool(extrinsics_decoder.contains_transaction and extrinsic_data.get('account_index')),
address_length=extrinsic_data.get('account_length'),
address=extrinsic_data.get('account_id'),
account_index=extrinsic_data.get('account_index'),
account_idx=extrinsic_data.get('account_idx'),
signature=extrinsic_data.get('signature'),
nonce=extrinsic_data.get('nonce'),
era=extrinsic_data.get('era'),
call=extrinsic_data.get('call_code'),
module_id=extrinsic_data.get('call_module'),
call_id=extrinsic_data.get('call_function'),
params=extrinsic_data.get('params'),
spec_version_id=parent_spec_version,
success=int(extrinsic_success),
error=int(not extrinsic_success),
codec_error=False
)
model.save(self.db_session)
extrinsics.append(model)
extrinsic_idx += 1
# Process extrinsic
if extrinsics_decoder.contains_transaction:
block.count_extrinsics_signed += 1
if model.signedby_address:
block.count_extrinsics_signedby_address += 1
if model.signedby_index:
block.count_extrinsics_signedby_index += 1
# Add search index for signed extrinsics
search_index = SearchIndex(
index_type_id=settings.SEARCH_INDEX_SIGNED_EXTRINSIC,
block_id=block.id,
extrinsic_idx=model.extrinsic_idx,
account_id=model.address
)
search_index.save(self.db_session)
else:
block.count_extrinsics_unsigned += 1
# Process extrinsic processors
for processor_class in ProcessorRegistry().get_extrinsic_processors(model.module_id, model.call_id):
extrinsic_processor = processor_class(block, model, substrate=self.substrate)
extrinsic_processor.accumulation_hook(self.db_session)
extrinsic_processor.process_search_index(self.db_session)
# Process event processors
for event in events:
extrinsic = None
if event.extrinsic_idx is not None:
try:
extrinsic = extrinsics[event.extrinsic_idx]
except IndexError:
extrinsic = None
for processor_class in ProcessorRegistry().get_event_processors(event.module_id, event.event_id):
event_processor = processor_class(block, event, extrinsic,
metadata=self.metadata_store.get(block.spec_version_id),
substrate=self.substrate)
event_processor.accumulation_hook(self.db_session)
event_processor.process_search_index(self.db_session)
# Process block processors
for processor_class in ProcessorRegistry().get_block_processors():
block_processor = processor_class(block, substrate=self.substrate, harvester=self)
block_processor.accumulation_hook(self.db_session)
# Debug info
if settings.DEBUG:
block.debug_info = json_block
# ==== Save data block ==================================
block.save(self.db_session)
return block
def remove_block(self, block_hash):
# Retrieve block
block = Block.query(self.db_session).filter_by(hash=block_hash).first()
# Revert event processors
for event in Event.query(self.db_session).filter_by(block_id=block.id):
for processor_class in ProcessorRegistry().get_event_processors(event.module_id, event.event_id):
event_processor = processor_class(block, event, None)
event_processor.accumulation_revert(self.db_session)
# Revert extrinsic processors
for extrinsic in Extrinsic.query(self.db_session).filter_by(block_id=block.id):
for processor_class in ProcessorRegistry().get_extrinsic_processors(extrinsic.module_id, extrinsic.call_id):
extrinsic_processor = processor_class(block, extrinsic)
extrinsic_processor.accumulation_revert(self.db_session)
# Revert block processors
for processor_class in ProcessorRegistry().get_block_processors():
block_processor = processor_class(block)
block_processor.accumulation_revert(self.db_session)
# Delete events
for item in Event.query(self.db_session).filter_by(block_id=block.id):
self.db_session.delete(item)
# Delete extrinsics
for item in Extrinsic.query(self.db_session).filter_by(block_id=block.id):
self.db_session.delete(item)
# Delete block
self.db_session.delete(block)
def sequence_block(self, block, parent_block_data=None, parent_sequenced_block_data=None):
sequenced_block = BlockTotal(
id=block.id
)
# Process block processors
for processor_class in ProcessorRegistry().get_block_processors():
block_processor = processor_class(block, sequenced_block, substrate=self.substrate)
block_processor.sequencing_hook(
self.db_session,
parent_block_data,
parent_sequenced_block_data
)
extrinsics = Extrinsic.query(self.db_session).filter_by(block_id=block.id).order_by('extrinsic_idx')
for extrinsic in extrinsics:
# Process extrinsic processors
for processor_class in ProcessorRegistry().get_extrinsic_processors(extrinsic.module_id, extrinsic.call_id):
extrinsic_processor = processor_class(block, extrinsic, substrate=self.substrate)
extrinsic_processor.sequencing_hook(
self.db_session,
parent_block_data,
parent_sequenced_block_data
)
events = Event.query(self.db_session).filter_by(block_id=block.id).order_by('event_idx')
# Process event processors
for event in events:
extrinsic = None
if event.extrinsic_idx is not None:
try:
extrinsic = extrinsics[event.extrinsic_idx]
except IndexError:
extrinsic = None
for processor_class in ProcessorRegistry().get_event_processors(event.module_id, event.event_id):
event_processor = processor_class(block, event, extrinsic, substrate=self.substrate)
event_processor.sequencing_hook(
self.db_session,
parent_block_data,
parent_sequenced_block_data
)
sequenced_block.save(self.db_session)
return sequenced_block
def integrity_checks(self):
# 1. Check finalized head
substrate = SubstrateInterface(settings.SUBSTRATE_RPC_URL)
if settings.FINALIZATION_BY_BLOCK_CONFIRMATIONS > 0:
finalized_block_hash = substrate.get_chain_head()
finalized_block_number = max(
substrate.get_block_number(finalized_block_hash) - settings.FINALIZATION_BY_BLOCK_CONFIRMATIONS, 0
)
else:
finalized_block_hash = substrate.get_chain_finalised_head()
finalized_block_number = substrate.get_block_number(finalized_block_hash)
# 2. Check integrity head
integrity_head = Status.get_status(self.db_session, 'INTEGRITY_HEAD')
if not integrity_head.value:
# Only continue if block #1 exists
if Block.query(self.db_session).filter_by(id=1).count() == 0:
raise BlockIntegrityError('Chain not at genesis')
integrity_head.value = 0
else:
integrity_head.value = int(integrity_head.value)
start_block_id = max(integrity_head.value - 1, 0)
end_block_id = finalized_block_number
chunk_size = 1000
parent_block = None
if start_block_id < end_block_id:
# Continue integrity check
# print('== Start integrity checks from {} to {} =='.format(start_block_id, end_block_id))
for block_nr in range(start_block_id, end_block_id, chunk_size):
# TODO replace limit with filter_by block range
block_range = Block.query(self.db_session).order_by('id')[block_nr:block_nr + chunk_size]
for block in block_range:
if parent_block:
if block.id != parent_block.id + 1:
# Save integrity head if block hash of parent matches with hash in node
if parent_block.hash == substrate.get_block_hash(integrity_head.value):
integrity_head.save(self.db_session)
self.db_session.commit()
raise BlockIntegrityError('Block #{} is missing.. stopping check '.format(parent_block.id + 1))
elif block.parent_hash != parent_block.hash:
self.process_reorg_block(parent_block)
self.process_reorg_block(block)
self.remove_block(block.hash)
self.remove_block(parent_block.hash)
self.db_session.commit()
self.add_block(substrate.get_block_hash(block.id))
self.add_block(substrate.get_block_hash(parent_block.id))
self.db_session.commit()
integrity_head.value = parent_block.id - 1
# Save integrity head if block hash of parent matches with hash in node
#if parent_block.parent_hash == substrate.get_block_hash(integrity_head.value):
integrity_head.save(self.db_session)
self.db_session.commit()
raise BlockIntegrityError('Block #{} failed integrity checks, Re-adding #{}.. '.format(parent_block.id, block.id))
else:
integrity_head.value = block.id
parent_block = block
if block.id == end_block_id:
break
if parent_block:
if parent_block.hash == substrate.get_block_hash(int(integrity_head.value)):
integrity_head.save(self.db_session)
self.db_session.commit()
return {'integrity_head': integrity_head.value}
def start_sequencer(self):
integrity_status = self.integrity_checks()
self.db_session.commit()
block_nr = None
integrity_head = Status.get_status(self.db_session, 'INTEGRITY_HEAD')
if not integrity_head.value:
integrity_head.value = 0
# 3. Check sequence head
sequencer_head = self.db_session.query(func.max(BlockTotal.id)).one()[0]
if sequencer_head is None:
sequencer_head = -1
# Start sequencing process
sequencer_parent_block = BlockTotal.query(self.db_session).filter_by(id=sequencer_head).first()
parent_block = Block.query(self.db_session).filter_by(id=sequencer_head).first()
for block_nr in range(sequencer_head + 1, int(integrity_head.value) + 1):
if block_nr == 0:
# No block ever sequenced, check if chain is at genesis state
assert (not sequencer_parent_block)
block = Block.query(self.db_session).order_by('id').first()
if not block:
self.db_session.commit()
return {'error': 'Chain not at genesis'}
if block.id == 1:
# Add genesis block
block = self.add_block(block.parent_hash)
if block.id != 0:
self.db_session.commit()
return {'error': 'Chain not at genesis'}
self.process_genesis(block)
sequencer_parent_block_data = None
parent_block_data = None
else:
block_id = sequencer_parent_block.id + 1
assert (block_id == block_nr)
block = Block.query(self.db_session).get(block_nr)
if not block:
self.db_session.commit()
return {'result': 'Finished at #{}'.format(sequencer_parent_block.id)}
sequencer_parent_block_data = sequencer_parent_block.asdict()
parent_block_data = parent_block.asdict()
sequenced_block = self.sequence_block(block, parent_block_data, sequencer_parent_block_data)
self.db_session.commit()
parent_block = block
sequencer_parent_block = sequenced_block
if block_nr:
return {'result': 'Finished at #{}'.format(block_nr)}
else:
return {'result': 'Nothing to sequence'}
def process_reorg_block(self, block):
# Check if reorg already exists
if ReorgBlock.query(self.db_session).filter_by(hash=block.hash).count() == 0:
model = ReorgBlock(**block.asdict())
model.save(self.db_session)
for extrinsic in Extrinsic.query(self.db_session).filter_by(block_id=block.id):
model = ReorgExtrinsic(block_hash=block.hash, **extrinsic.asdict())
model.save(self.db_session)
for event in Event.query(self.db_session).filter_by(block_id=block.id):
model = ReorgEvent(block_hash=block.hash, **event.asdict())
model.save(self.db_session)
for log in Log.query(self.db_session).filter_by(block_id=block.id):
model = ReorgLog(block_hash=block.hash, **log.asdict())
model.save(self.db_session)
def rebuild_search_index(self):
self.db_session.execute('truncate table {}'.format(SearchIndex.__tablename__))
for block in Block.query(self.db_session).order_by('id').yield_per(1000):
extrinsic_lookup = {}
block._accounts_new = []
block._accounts_reaped = []
for extrinsic in Extrinsic.query(self.db_session).filter_by(block_id=block.id).order_by('extrinsic_idx'):
extrinsic_lookup[extrinsic.extrinsic_idx] = extrinsic
# Add search index for signed extrinsics
if extrinsic.address:
search_index = SearchIndex(
index_type_id=settings.SEARCH_INDEX_SIGNED_EXTRINSIC,
block_id=block.id,
extrinsic_idx=extrinsic.extrinsic_idx,
account_id=extrinsic.address
)
search_index.save(self.db_session)
# Process extrinsic processors
for processor_class in ProcessorRegistry().get_extrinsic_processors(extrinsic.module_id, extrinsic.call_id):
extrinsic_processor = processor_class(block=block, extrinsic=extrinsic, substrate=self.substrate)
extrinsic_processor.process_search_index(self.db_session)
for event in Event.query(self.db_session).filter_by(block_id=block.id).order_by('event_idx'):
extrinsic = None
if event.extrinsic_idx is not None:
try:
extrinsic = extrinsic_lookup[event.extrinsic_idx]
except (IndexError, KeyError):
extrinsic = None
for processor_class in ProcessorRegistry().get_event_processors(event.module_id, event.event_id):
event_processor = processor_class(block, event, extrinsic,
metadata=self.metadata_store.get(block.spec_version_id),
substrate=self.substrate)
event_processor.process_search_index(self.db_session)
self.db_session.commit()
def create_full_balance_snaphot(self, block_id):
block_hash = self.substrate.get_block_hash(block_id)
# Determine if keys have Blake2_128Concat format so AccountId is stored in storage key
storage_method = self.substrate.get_metadata_storage_function(
module_name="System",
storage_name="Account",
block_hash=block_hash
)
if storage_method:
if storage_method.get("type_hasher_key1") == "Blake2_128Concat":
# get balances storage prefix
storage_key_prefix = self.substrate.generate_storage_hash(
storage_module='System',
storage_function='Account',
metadata_version=settings.SUBSTRATE_METADATA_VERSION
)
rpc_result = self.substrate.rpc_request(
'state_getKeys',
[storage_key_prefix, block_hash]
).get('result')
# Extract accounts from storage key
accounts = [storage_key[-64:] for storage_key in rpc_result if len(storage_key) == 162]
else:
# Retrieve accounts from database for legacy blocks
accounts = [account[0] for account in self.db_session.query(distinct(Account.id))]
for account_id in accounts:
self.create_balance_snapshot(block_id=block_id, account_id=account_id, block_hash=block_hash)
def create_balance_snapshot(self, block_id, account_id, block_hash=None):
if not block_hash:
block_hash = self.substrate.get_block_hash(block_id)
# Get balance for account
try:
account_info_data = self.substrate.get_runtime_state(
module='System',
storage_function='Account',
params=['0x{}'.format(account_id)],
block_hash=block_hash
).get('result')
# Make sure no rows inserted before processing this record
AccountInfoSnapshot.query(self.db_session).filter_by(block_id=block_id, account_id=account_id).delete()
if account_info_data:
account_info_obj = AccountInfoSnapshot(
block_id=block_id,
account_id=account_id,
account_info=account_info_data,
balance_free=account_info_data["data"]["free"],
balance_reserved=account_info_data["data"]["reserved"],
balance_total=account_info_data["data"]["free"] + account_info_data["data"]["reserved"],
nonce=account_info_data["nonce"]
)
else:
account_info_obj = AccountInfoSnapshot(
block_id=block_id,
account_id=account_id,
account_info=None,
balance_free=None,
balance_reserved=None,
balance_total=None,
nonce=None
)
account_info_obj.save(self.db_session)
except ValueError:
pass
def update_account_balances(self):
# set balances according to most recent snapshot
account_info = self.db_session.execute("""
select
a.account_id,
a.balance_total,
a.balance_free,
a.balance_reserved,
a.nonce
from
data_account_info_snapshot as a
inner join (
select
account_id, max(block_id) as max_block_id
from data_account_info_snapshot
group by account_id
) as b
on a.account_id = b.account_id and a.block_id = b.max_block_id
""")
for account_id, balance_total, balance_free, balance_reserved, nonce in account_info:
Account.query(self.db_session).filter_by(id=account_id).update(
{
Account.balance_total: balance_total,
Account.balance_free: balance_free,
Account.balance_reserved: balance_reserved,
Account.nonce: nonce,
}, synchronize_session='fetch'
)
class JSONRPCResource(BaseResource):
def __init__(self, cache_region):
self.cache_region = cache_region
# Check for custom types in Redis
self.substrate = None
custom_type_registry = self.cache_region.get('CUSTOM_TYPE_REGISTRY')
self.init_type_registry(custom_type_registry)
self.block_hash = None
self.metadata_decoder = None
self.runtime_version = None
self.metadata_cache = {}
self.methods = [
'rpc_methods',
'runtime_decodeScale',
'runtime_encodeScale',
'runtime_getMetadata',
'runtime_getMetadataModules',
'runtime_getMetadataCallFunctions',
'runtime_getMetadataCallFunction',
'runtime_getMetadataEvents',
'runtime_getMetadataEvent',
'runtime_getMetadataConstants',
'runtime_getMetadataConstant',
'runtime_getMetadataStorageFunctions',
'runtime_getMetadataStorageFunction',
'runtime_getMetadataErrors',
'runtime_getMetadataError',
'runtime_getState',
'runtime_getTypeRegistry',
'runtime_getType',
'runtime_getCustomTypes',
'runtime_addCustomType',
'runtime_setCustomTypes',
'runtime_removeCustomType',
'runtime_resetCustomTypes',
'runtime_getBlock',
'runtime_createSignaturePayload',
'runtime_createExternalSignerPayload',
'runtime_createExtrinsic',
'runtime_submitExtrinsic',
'runtime_getPaymentInfo',
'keypair_create',
'keypair_inspect',
'keypair_sign',
'keypair_verify'
]
def get_request_param(self, params):
try:
return params.pop(0)
except IndexError:
raise ValueError("Not enough parameters provided")
def init_type_registry(self, custom_type_registry=None):
if settings.TYPE_REGISTRY_FILE:
type_registry = load_type_registry_file(settings.TYPE_REGISTRY_FILE)
else:
type_registry = {}
if custom_type_registry:
type_registry.update(custom_type_registry)
self.substrate = SubstrateInterface(
url=settings.SUBSTRATE_RPC_URL,
ss58_format=settings.SUBSTRATE_ADDRESS_TYPE,
type_registry_preset=settings.TYPE_REGISTRY,
type_registry=custom_type_registry
)
if settings.DEBUG:
print('Custom types at init: ', custom_type_registry)
self.substrate.debug = True
def init_request(self, params=None):
if params:
self.block_hash = self.get_request_param(params)
if type(self.block_hash) is int:
self.block_hash = self.substrate.get_block_hash(self.block_hash)
def on_post(self, req, resp):
self.block_hash = None
self.metadata_decoder = None
self.runtime_version = None
self.substrate.request_id = req.media.get('id')
method = req.media.get('method')
params = req.media.get('params', [])
# Check request requirements
if not req.media.get('jsonrpc'):
resp.media = {
"error": {
"code": -32600,
"message": "Unsupported JSON-RPC protocol version"
},
"id": req.media.get('id')
}
elif not method:
resp.media = {
"error": {
"code": -32601,
"message": "Method not found"
},
"id": req.media.get('id')
}
elif method not in self.methods:
# Default pass through request to Substrate RPC
resp.media = self.substrate.rpc_request(method, params)
else:
resp.status = falcon.HTTP_200
try:
# Process methods
if method == 'runtime_getBlock':
self.init_request(params)
block = self.substrate.get_block(block_hash=self.block_hash)
if block:
block['extrinsics'] = [extrinsic.value for extrinsic in block['extrinsics']]
block['header']["digest"]["logs"] = [log.value for log in block['header']["digest"]["logs"]]
response = {
"jsonrpc": "2.0",
"result": block,
"id": req.media.get('id')
}
elif method == 'runtime_getState':
# Init params
storage_params = None
# Process params
module = self.get_request_param(params)
storage_function = self.get_request_param(params)
if params:
storage_params = self.get_request_param(params)
self.init_request(params)
# Get response
obj = self.substrate.query(
module=module,
storage_function=storage_function,
params=storage_params,
block_hash=self.block_hash
)
response = {'result': obj.value if obj else None}
elif method == 'runtime_getMetadata':
# Process params
self.init_request(params)
# Get response
response = self.substrate.get_runtime_metadata(block_hash=self.block_hash)
elif method in ['runtime_createSignaturePayload', 'runtime_createExternalSignerPayload']:
account = self.get_request_param(params)
call_module = self.get_request_param(params)
call_function = self.get_request_param(params)
call_params = self.get_request_param(params)
tip = self.get_request_param(params) or 0
era = self.get_request_param(params)
self.init_request(params)
try:
# Create call
call = self.substrate.compose_call(
call_module=call_module,
call_function=call_function,
call_params=call_params,
block_hash=self.block_hash
)
nonce = self.substrate.get_account_nonce(account) or 0
if isinstance(era, dict) and 'current' not in era and 'phase' not in era:
# Retrieve current block id
era['current'] = self.substrate.get_block_number(self.substrate.get_chain_head())
if method == 'runtime_createExternalSignerPayload':
include_call_length = True
else:
include_call_length = False
# Generate signature payload
signature_payload = self.substrate.generate_signature_payload(
call=call,
nonce=nonce,
tip=tip,
era=era,
include_call_length=include_call_length
)
response = {
"jsonrpc": "2.0",
"result": {
'signature_payload': str(signature_payload),
'nonce': nonce,
'era': era
},
"id": req.media.get('id')
}
except ValueError as e:
response = {
"jsonrpc": "2.0",
"error": {
"code": -999,
"message": str(e)
},
"id": req.media.get('id')
}
elif method in ['runtime_submitExtrinsic', 'runtime_createExtrinsic']:
account = self.get_request_param(params)
call_module = self.get_request_param(params)
call_function = self.get_request_param(params)
call_params = self.get_request_param(params)
tip = self.get_request_param(params) or 0
era = self.get_request_param(params)
crypto_type = int(self.get_request_param(params) or 1)
signature = self.get_request_param(params)
self.init_request(params)
try:
# Create call
call = self.substrate.compose_call(
call_module=call_module,
call_function=call_function,
call_params=call_params,
block_hash=self.block_hash
)
nonce = self.substrate.get_account_nonce(account) or 0
# Create keypair with only public given given in request
keypair = Keypair(ss58_address=account, crypto_type=crypto_type)
if isinstance(era, dict) and 'current' in era:
era['current'] = int(era['current'])
# Create extrinsic
extrinsic = self.substrate.create_signed_extrinsic(
call=call,
keypair=keypair,
nonce=nonce,
signature=signature,
tip=tip,
era=era
)
if method == 'runtime_createExtrinsic':
result = str(extrinsic.data)
else:
# Submit extrinsic to the node
extrinsic_result = self.substrate.submit_extrinsic(
extrinsic=extrinsic
)
result = {
"extrinsic_hash": extrinsic_result.extrinsic_hash,
"block_hash": extrinsic_result.block_hash,
"finalized": extrinsic_result.finalized,
}
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
except ValueError as e:
response = {
"jsonrpc": "2.0",
"error": {
"code": -999,
"message": str(e)
},
"id": req.media.get('id')
}
except SubstrateRequestException as e:
response = {
"jsonrpc": "2.0",
"error": e.args[0],
"id": req.media.get('id')
}
elif method == 'runtime_getPaymentInfo':
account = self.get_request_param(params)
call_module = self.get_request_param(params)
call_function = self.get_request_param(params)
call_params = self.get_request_param(params)
# Create call
call = self.substrate.compose_call(
call_module=call_module,
call_function=call_function,
call_params=call_params
)
# Create keypair with only public given given in request
keypair = Keypair(ss58_address=account)
response = {
"jsonrpc": "2.0",
"result": self.substrate.get_payment_info(call=call, keypair=keypair),
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataModules':
self.init_request(params)
response = {
"jsonrpc": "2.0",
"result": self.substrate.get_metadata_modules(block_hash=self.block_hash),
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataCallFunctions':
self.init_request(params)
call_list = self.substrate.get_metadata_call_functions(block_hash=self.block_hash)
response = {
"jsonrpc": "2.0",
"result": call_list,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataCallFunction':
param_call_module = self.get_request_param(params)
param_call_module_function = self.get_request_param(params)
self.init_request(params)
result = self.substrate.get_metadata_call_function(
module_name=param_call_module,
call_function_name=param_call_module_function,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result.value,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataEvents':
self.init_request(params)
event_list = self.substrate.get_metadata_events(block_hash=self.block_hash)
response = {
"jsonrpc": "2.0",
"result": event_list,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataEvent':
param_call_module = self.get_request_param(params)
param_call_module_event = self.get_request_param(params)
self.init_request(params)
result = self.substrate.get_metadata_event(
module_name=param_call_module,
event_name=param_call_module_event,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataConstants':
self.init_request(params)
constant_list = self.substrate.get_metadata_constants(block_hash=self.block_hash)
response = {
"jsonrpc": "2.0",
"result": constant_list,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataConstant':
module_name = self.get_request_param(params)
constant_name = self.get_request_param(params)
self.init_request(params)
result = self.substrate.get_metadata_constant(
module_name=module_name,
constant_name=constant_name,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataStorageFunctions':
self.init_request(params)
storage_list = self.substrate.get_metadata_storage_functions(block_hash=self.block_hash)
response = {
"jsonrpc": "2.0",
"result": storage_list,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataStorageFunction':
module_name = self.get_request_param(params)
storage_name = self.get_request_param(params)
self.init_request(params)
result = self.substrate.get_metadata_storage_function(
module_name=module_name,
storage_name=storage_name,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result.value,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataErrors':
self.init_request(params)
error_list = self.substrate.get_metadata_errors(block_hash=self.block_hash)
response = {
"jsonrpc": "2.0",
"result": error_list,
"id": req.media.get('id')
}
elif method == 'runtime_getMetadataError':
module_name = self.get_request_param(params)
error_name = self.get_request_param(params)
self.init_request(params)
result = self.substrate.get_metadata_error(
module_name=module_name,
error_name=error_name,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_getTypeRegistry':
self.init_request(params)
result = self.substrate.get_type_registry(block_hash=self.block_hash)
if result:
result = list(result.values())
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_getType':
type_string = self.get_request_param(params)
self.init_request(params)
response = {
"jsonrpc": "2.0",
"result": self.substrate.get_type_definition(type_string, block_hash=self.block_hash),
"id": req.media.get('id')
}
elif method == 'runtime_addCustomType':
type_string = self.get_request_param(params)
type_definition = self.get_request_param(params)
# Retrieve current custom type registry
custom_type_registry = self.cache_region.get('CUSTOM_TYPE_REGISTRY')
if not custom_type_registry:
custom_type_registry = {
'types': {
}
}
custom_type_registry['types'][type_string] = type_definition
# TODO Try to decode given type definition
# Store updated custom type registry
self.cache_region.set('CUSTOM_TYPE_REGISTRY', custom_type_registry)
if settings.DEBUG:
print('Custom types updated to: ', custom_type_registry)
# Update runtime configuration
RuntimeConfiguration().update_type_registry(custom_type_registry)
response = {
"jsonrpc": "2.0",
"result": "Type registry updated",
"id": req.media.get('id')
}
elif method == 'runtime_setCustomTypes':
custom_types = self.get_request_param(params)
if type(custom_types) is not dict:
raise ValueError('custom types must be in format: {"type_string": "type_definition"}')
custom_type_registry = {
'types': custom_types
}
# Store updated custom type registry
self.cache_region.set('CUSTOM_TYPE_REGISTRY', custom_type_registry)
# Reset runtime configuration
RuntimeConfiguration().clear_type_registry()
self.init_type_registry(custom_type_registry)
if settings.DEBUG:
print('Custom types updated to: ', custom_type_registry)
response = {
"jsonrpc": "2.0",
"result": "Type registry updated",
"id": req.media.get('id')
}
elif method == 'runtime_resetCustomTypes':
custom_type_registry = None
# Store updated custom type registry
self.cache_region.set('CUSTOM_TYPE_REGISTRY', custom_type_registry)
# Reset runtime configuration
RuntimeConfiguration().clear_type_registry()
self.init_type_registry()
if settings.DEBUG:
print('Custom types cleared')
response = {
"jsonrpc": "2.0",
"result": "Custom types cleared",
"id": req.media.get('id')
}
elif method == 'runtime_removeCustomType':
type_string = self.get_request_param(params)
# Retrieve current custom type registry
custom_type_registry = self.cache_region.get('CUSTOM_TYPE_REGISTRY')
if custom_type_registry and type_string in custom_type_registry.get('types', {}):
del custom_type_registry['types'][type_string]
# Store updated custom type registry
self.cache_region.set('CUSTOM_TYPE_REGISTRY', custom_type_registry)
# Reset runtime configuration
RuntimeConfiguration().clear_type_registry()
self.init_type_registry(custom_type_registry)
result = '"{}" removed from custom type registry'.format(type_string)
else:
result = '"{}" not found in custom type registry'.format(type_string)
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_getCustomTypes':
custom_type_registry = self.cache_region.get('CUSTOM_TYPE_REGISTRY')
if custom_type_registry:
result = custom_type_registry.get('types')
else:
result = {}
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_decodeScale':
type_string = self.get_request_param(params)
scale_hex_bytes = self.get_request_param(params)
self.init_request(params)
result = self.substrate.decode_scale(
type_string=type_string,
scale_bytes=scale_hex_bytes,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'runtime_encodeScale':
type_string = self.get_request_param(params)
value = self.get_request_param(params)
self.init_request(params)
result = self.substrate.encode_scale(
type_string=type_string,
value=value,
block_hash=self.block_hash
)
response = {
"jsonrpc": "2.0",
"result": result,
"id": req.media.get('id')
}
elif method == 'keypair_create':
word_count = self.get_request_param(params) or 0
crypto_type = int(self.get_request_param(params) or 1)
mnemonic = Keypair.generate_mnemonic(word_count)
keypair = Keypair.create_from_mnemonic(
mnemonic=mnemonic, ss58_format=settings.SUBSTRATE_ADDRESS_TYPE, crypto_type=crypto_type
)
response = {
"jsonrpc": "2.0",
"result": {
'ss58_address': keypair.ss58_address,
'public_key': keypair.public_key,
'private_key': keypair.private_key,
'mnemonic': keypair.mnemonic,
},
"id": req.media.get('id')
}
elif method == 'keypair_inspect':
mnemonic = self.get_request_param(params)
crypto_type = int(self.get_request_param(params) or 1)
keypair = Keypair.create_from_mnemonic(
mnemonic=mnemonic, ss58_format=settings.SUBSTRATE_ADDRESS_TYPE, crypto_type=crypto_type
)
response = {
"jsonrpc": "2.0",
"result": {
'ss58_address': keypair.ss58_address,
'public_key': keypair.public_key,
'private_key': keypair.private_key,
'mnemonic': keypair.mnemonic,
},
"id": req.media.get('id')
}
elif method == 'keypair_sign':
mnemonic = self.get_request_param(params)
data = self.get_request_param(params)
crypto_type = int(self.get_request_param(params) or 1)
keypair = Keypair.create_from_mnemonic(
mnemonic=mnemonic, ss58_format=settings.SUBSTRATE_ADDRESS_TYPE, crypto_type=crypto_type
)
signature = keypair.sign(data)
response = {
"jsonrpc": "2.0",
"result": {'signature': signature},
"id": req.media.get('id')
}
elif method == 'keypair_verify':
account_address = self.get_request_param(params)
data = self.get_request_param(params)
signature = self.get_request_param(params)
crypto_type = int(self.get_request_param(params) or 1)
keypair = Keypair(
ss58_address=account_address,
ss58_format=settings.SUBSTRATE_ADDRESS_TYPE,
crypto_type=crypto_type
)
result = keypair.verify(data, signature)
response = {
"jsonrpc": "2.0",
"result": {'verified': result},
"id": req.media.get('id')
}
elif method == 'rpc_methods':
response = self.substrate.rpc_request(method, params)
# Add additional implemented method
response['result']['methods'] = sorted(response['result']['methods'] + self.methods)
else:
raise NotImplementedError('Method \'{}\' not implemented yet'.format(method))
except (ValueError, NotImplementedError) as e:
response = {
"error": {
"code": -999,
"message": str(e)
},
"id": req.media.get('id')
}
except (InvalidScaleTypeValueException, RemainingScaleBytesNotEmptyException) as e:
response = {
"error": {
"code": -998,
"message": "Decoding error, given SCALE-value or type registry might be invalid "
},
"id": req.media.get('id')
}
resp.media = response
return balance_info['data']['free'] / 10**12
alice_keypair = Keypair.create_from_uri('//Alice')
print ('Alice pubkey:', alice_keypair.public_key)
print ('Alice address:', alice_keypair.ss58_address)
print ('Alice balance:', get_balance(alice_keypair))
bob_keypair = Keypair.create_from_uri('//Bob')
print ('Bob pubkey:', bob_keypair.public_key)
print ('Bob address:', bob_keypair.ss58_address)
print ('Bob balance:', get_balance(bob_keypair))
# -----------------
# Print subtensor pallet info
print ('\n')
print ('Subtensor Pallet:', substrate.get_metadata_storage_function('SubtensorModule', 'Weights'))
# -----------------
# Set a weight on the chain.
def setWeights(keypair_A, keypair_B, value):
call = substrate.compose_call(
call_module='SubtensorModule',
call_function='set_weights',
call_params={'dests': [keypair_B.public_key], 'values': [value]}
)
extrinsic = substrate.create_signed_extrinsic(call=call, keypair=keypair_A)
substrate.submit_extrinsic(extrinsic, wait_for_inclusion=False)
print ('Wait for inclusion...')
time.sleep(15)
print ('Done. \n')
