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from alpha_vantage.timeseries import TimeSeries | |
from apscheduler.schedulers.background import BackgroundScheduler | |
from flask import Flask | |
from pytezos import pytezos, Key | |
from datetime import datetime, timezone | |
import atexit, base64, os, tempfile | |
oracle_address = os.environ['ORACLE_ADDRESS'] | |
alpha_vantage_api_key = os.environ['ALPHA_VANTAGE_API_KEY'] | |
alpha_vantage_ticker_symbol = os.environ['ALPHA_VANTAGE_TICKER_SYMBOL'] | |
tezos_user_key = None | |
with tempfile.NamedTemporaryFile(suffix='.json', delete=False) as key_file: | |
key_file.write(base64.standard_b64decode(os.environ['TEZOS_USER_KEY'])) | |
key_file.close() | |
tezos_user_key = Key.from_faucet(key_file.name) | |
os.remove(key_file.name) | |
class OracleServer: | |
def __init__(self, api_key=alpha_vantage_api_key, ticker_symbol=alpha_vantage_ticker_symbol, tezos_key=tezos_user_key, oracle_contract_address=oracle_address): | |
self.oracle_contract_address = oracle_contract_address | |
self.pytezos_instance = pytezos.using(key=tezos_key, shell='carthagenet') | |
self.time_series = TimeSeries(key=api_key, output_format='json') | |
self.ticker_symbol = ticker_symbol | |
def oracle_contract(self): | |
return self.pytezos_instance.contract(self.oracle_contract_address) | |
def update_value(self): | |
try: | |
now_utc = datetime.now(tz=timezone.utc) | |
operation_group = self.oracle_contract().updateValue(now_utc, self.price()).operation_group # hi | |
operation_str = f"<p> Last operation:\n{operation_group.autofill().sign().inject()} </p>" | |
storage_str = f"<p> Current storage:\n{self.oracle_contract().storage()} </p>" | |
return (operation_str + storage_str) | |
except Exception as e: | |
exception_doc = f"<p> Exception: {str(e.__doc__)} </p>" | |
exception_message = None | |
try: | |
exception_message = f"<p> {str(e.message)} </p>" | |
except: | |
exception_message = f"(unknown message: {e.__class__.__name__})" | |
return (exception_doc + exception_message) | |
def price(self): | |
quote_data, expected_none = self.time_series.get_quote_endpoint(self.ticker_symbol) | |
if expected_none is None: | |
try: | |
return int(float(quote_data['05. price']) * 100) | |
except KeyError: | |
raise f"expected key: '05. price' in {str(quote_data)}" | |
else: | |
raise f"expected_none not None: {str(expected_none)}" | |
def update_oracle(): | |
return str(OracleServer().update_value()) | |
app = Flask(__name__) | |
@app.route('/') | |
def index(): | |
return update_oracle(), 200 | |
oracle_update_scheduler = BackgroundScheduler() | |
oracle_update_scheduler.add_job(func=update_oracle, trigger="interval", seconds=30) | |
oracle_update_scheduler.start() | |
atexit.register(lambda: oracle_update_scheduler.shutdown()) |