mango-explorer/bin/fetch-price

#!/usr/bin/env pyston3

import argparse
import logging
import os
import os.path
import sys

sys.path.insert(0, os.path.abspath(
    os.path.join(os.path.dirname(__file__), "..")))
import mango  # nopep8

parser = argparse.ArgumentParser(description="Displays the price from the Pyth Network.")
mango.ContextBuilder.add_command_line_parameters(parser)
parser.add_argument("--provider", type=str, required=True,
                    help="name of the price provider to use (e.g. pyth)")
parser.add_argument("--symbol", type=str, required=True,
                    help="market symbol to display (e.g. ETH/USDC)")
parser.add_argument("--stream", action="store_true", default=False,
                    help="stream the prices until stopped")
args = parser.parse_args()

logging.getLogger().setLevel(args.log_level)
logging.warning(mango.WARNING_DISCLAIMER_TEXT)

context = mango.ContextBuilder.from_command_line_parameters(args)

logging.info(str(context))

oracle_provider: mango.OracleProvider = mango.create_oracle_provider(args.provider)

market = context.market_lookup.find_by_symbol(args.symbol.upper())
if market is None:
    raise Exception(f"Could not find market {args.symbol}.")

oracle = oracle_provider.oracle_for_market(context, market)
if oracle is None:
    print(f"Could not find oracle for market {market.symbol} from provider {args.provider}.")
else:
    if not args.stream:
        price = oracle.fetch_price(context)
        confidence = ""
        if price.source.supports & mango.SupportedOracleFeature.CONFIDENCE:
            confidence = f" +/- {price.confidence:,.8f}"
        print(
            f"The price of «{oracle.symbol}» on {price.source.provider_name} is: '{price.mid_price:,.8f}'{confidence}")
    else:
        print("Press <ENTER> to quit.")
        price_subscription = oracle.to_streaming_observable(context)
        disposable = price_subscription.subscribe(mango.PrintingObserverSubscriber(False))

        # Wait - don't exit
        input()
        disposable.dispose()