def _save_if_erc20_token(w3: Web3Client, crud: Crud,
transaction: TxData) -> None:
if not w3.is_transaction_contract_creation(transaction):
return
address = w3.get_contract_address_by_transaction_hash(transaction["hash"])
if w3.is_contract_erc20(address):
crud.save_token_address(address)
def _get_first_block(w3: Web3Client, crud: Crud) -> Optional[BlockData]:
start_block_hash = crud.get_start_block_hash()
if not start_block_hash:
block = w3.get_latest_block(full_transactions=True)
crud.set_start_block(block["hash"])
return block
else:
current_block_hash = crud.get_current_block_hash()
assert current_block_hash is not None
return w3.get_block_by_hash(current_block_hash, full_transactions=True)
def query_ERC20_tokens(*, w3: Web3Client, crud: Crud) -> None:
block = _get_first_block(w3, crud)
crud.set_is_block_fetch(True)
last_block_hash = crud.get_last_block_hash()
while block and block["hash"] != last_block_hash:
crud.set_current_block(block["hash"])
transactions: Sequence[TxData] = block["transactions"] # type: ignore
_find_contract_creations(w3, crud, transactions)
block = w3.get_parent_block(block, full_transactions=True)
_finish_process(crud)
def fetch_address_token_balances(eoa_address: str, *, w3: Web3Client,
crud: Crud) -> Dict:
session_obj = {
"address": eoa_address,
"started_at": datetime.datetime.utcnow().timestamp(),
"processing": True,
}
crud.save_address_balances(eoa_address, session_obj)
token_addresses = crud.get_token_addresses()
for token_addr in token_addresses:
balance = w3.get_eoa_token_balance(eoa_address, token_addr)
session_obj.update({token_addr: balance})
crud.save_address_balances(eoa_address, session_obj)
session_obj["processing"] = False
crud.save_address_balances(eoa_address, session_obj)
return session_obj
from app import create_app
from app.crud import Crud
from flask import request, make_response
if __name__ == '__main__':
app = create_app()
#Instanciar el método de la clase crud encargada de realizar las operaciones sobre la BD
crud = Crud()
@app.route('/user', methods=['GET', 'POST', 'PUT', 'DELETE'])
def user():
response = None
#Identificar el método de la solicitud
if request.method == 'GET':
response = make_response(crud.read())
response.headers['Content-Type'] = 'application/json'
return response
elif request.method == 'POST':
response = make_response(crud.create(request.data.decode()))
response.headers['Content-Type'] = 'application/json'
return response
elif request.method == 'PUT':
response = make_response(crud.update(request.data.decode()))
response.headers['Content-Type'] = 'application/json'
return response
elif request.method == 'DELETE':
response = make_response(crud.delete(request.data.decode()))
def _finish_process(crud: Crud) -> None:
crud.set_last_block(crud.get_start_block_hash())
crud.set_current_block(None)
crud.set_start_block(None)
crud.set_is_block_fetch(False)