#!/usr/bin/env python3
import argparse
import asyncio
import configparser
import json
import logging
import os
import sys
from aiorobinhood import RobinhoodClient, ClientError
async def main(args: argparse.Namespace) -> None:
# Load Robinhood account credentials
config = configparser.ConfigParser(interpolation=None)
config.read(args.path)
# Define symbols set
if args.weighting == "file":
try:
with open(args.symbols) as f:
weights = json.load(f)
if sum(weights.values()) > 1:
raise ValueError("Sum of custom weights must not exceed 1")
symbols = set(weights.keys())
except OSError:
raise RuntimeError(f"Could not find file '{args.symbols}'")
except json.JSONDecodeError:
raise RuntimeError(f"'{args.symbols}' does not contain valid JSON")
else:
symbols = set(args.symbols)
async with RobinhoodClient(timeout=args.timeout) as client:
await client.login(**config["credentials"])
portfolio, fundamentals, positions = await asyncio.gather(
client.get_portfolio(),
client.get_fundamentals(symbols=symbols),
client.get_positions(),
)
# Compute the target equity for each security
total_equity = 0.99 * float(portfolio["equity"])
if args.weighting == "cap":
total_cap = sum(float(f["market_cap"]) for f in fundamentals)
equity = {
symbol: total_equity * float(f["market_cap"]) / total_cap
for symbol, f in zip(symbols, fundamentals)
}
elif args.weighting == "equal":
equity = dict.fromkeys(symbols, total_equity / len(symbols))
elif args.weighting == "file":
equity = {
symbol: total_equity * weight
for symbol, weight in weights.items()
}
# Rebalance our existing positions
sell_orders = []
buy_orders = []
for position, quote in zip(
positions,
await client.get_quotes(instruments=[p["instrument"] for p in positions]),
):
if position["instrument"] != quote["instrument"]:
raise RuntimeError("Position and quote data are not aligned!")
symbol = quote["symbol"]
quantity = float(position["quantity"])
if symbol not in symbols:
logging.info(f"- {symbol:<5} (closing position)")
sell_orders.append(client.place_market_sell_order(symbol, quantity=quantity))
else:
current_equity = quantity * float(quote["last_trade_price"])
target_equity = equity[symbol]
if current_equity - target_equity > args.epsilon:
sell_value = current_equity - target_equity
logging.info(f"- {symbol:<5} ${sell_value:0.2f}")
sell_orders.append(client.place_market_sell_order(symbol, amount=sell_value))
elif target_equity - current_equity > args.epsilon:
buy_value = target_equity - current_equity
logging.info(f"+ {symbol:<5} ${buy_value:0.2f}")
buy_orders.append(client.place_market_buy_order(symbol, amount=buy_value))
else:
logging.info(f"= {symbol:<5} |${current_equity - target_equity:0.2f}| < ${args.epsilon}")
symbols.remove(symbol)
# Add new stocks to our positions
for symbol in symbols:
logging.info(f"+ {symbol:<5} ${equity[symbol]:0.2f} (new position)")
buy_orders.append(client.place_market_buy_order(symbol, amount=equity[symbol]))
# Process the orders (sell orders first)
for order in sell_orders + buy_orders:
if args.dry_run:
# Cancel the coroutine
order.close()
else:
try:
await order
except ClientError:
symbol = order.cr_frame.f_locals["args"][1]
logging.exception(f"{symbol} order failed")
finally:
await asyncio.sleep(6)
await client.logout()
if __name__ == "__main__":
logging.basicConfig(format="%(message)s", level=logging.INFO)
file_mode = "file" in sys.argv
parser = argparse.ArgumentParser(
description="Rebalance your Robinhood stock portfolio.",
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
"symbols",
metavar="SSSS",
type=str,
nargs=None if file_mode else "+",
help="path to JSON symbols file" if file_mode else "list of space separated stock symbols",
)
parser.add_argument(
"-d",
"--dry-run",
action="store_true",
help="disables live ordering",
)
parser.add_argument(
"-e",
"--epsilon",
type=float,
default=0.01,
help="minimum difference to trigger a rebalance (in dollars)",
)
parser.add_argument(
"-p",
"--path",
type=str,
default=f"{os.getenv('HOME')}/.config.ini",
help="path to the config file",
)
parser.add_argument(
"-t",
"--timeout",
type=int,
default=3,
help="aiorobinhood request timeout",
)
parser.add_argument(
"-w",
"--weighting",
type=str,
choices=["cap", "equal", "file"],
default="equal",
help="weighting scheme to use for rebalancing",
)
asyncio.run(main(parser.parse_args()))
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