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Python interface to HumbleSwap pool state
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#!/usr/bin/env python3 | |
import sys | |
import struct | |
from base64 import b64decode | |
from algosdk.v2client.algod import AlgodClient | |
from tinyman.assets import Asset, AssetAmount | |
class HumblePool: | |
"""Liquidity pool in the HumbleSwap AMM DEX.""" | |
def __init__(self, client: AlgodClient, app_id: int, N2NN: bool) -> None: | |
"""Constructor method for :class:`HumblePool` | |
:param client: a :class:`AlgodClient` object | |
:param app_id: pool app_id | |
:param N2NN: NetworkAsset<->NonNetworkAsset pool type flag, True for ALGO<->OTHER pools | |
""" | |
self.client = client | |
self.app_id = app_id | |
self.is_algo_pool = N2NN | |
app_info = self.client.application_info(self.app_id) | |
app_state = app_info['params']['global-state'] | |
state_data = {b64decode(x['key']).hex(): b64decode(x['value']['bytes']) for x in app_state} | |
self.state_data = state_data | |
b0 = state_data['00'] | |
if self.is_algo_pool: | |
tokenB_id, = struct.unpack_from('!Q', b0, 32) | |
self.asset1 = Asset(id=0).fetch(self.client) | |
self.asset2 = Asset(id=tokenB_id).fetch(self.client) | |
else: | |
tokenA_id, tokenB_id = struct.unpack_from('!QQ', b0, 32) | |
self.asset1 = Asset(id=tokenA_id).fetch(self.client) | |
self.asset2 = Asset(id=tokenB_id).fetch(self.client) | |
self.refresh() | |
def refresh(self): | |
app_info = self.client.application_info(self.app_id) | |
app_state = app_info['params']['global-state'] | |
state_data = {b64decode(x['key']).hex(): b64decode(x['value']['bytes']) for x in app_state} | |
b0 = state_data['00'] | |
if self.is_algo_pool: | |
balA, balB = struct.unpack_from('!QQ', b0, offset=32+57) | |
else: | |
balA, balB = struct.unpack_from('!QQ', b0, offset=32+65) | |
self.asset1_reserves = balA | |
self.asset2_reserves = balB | |
def fetch_fixed_input_swap_quote(self, amount_in: AssetAmount): | |
asset_in, asset_in_amount = amount_in.asset, amount_in.amount | |
self.refresh() | |
if asset_in == self.asset1: | |
asset_out = self.asset2 | |
input_supply = self.asset1_reserves | |
output_supply = self.asset2_reserves | |
else: | |
asset_out = self.asset1 | |
input_supply = self.asset2_reserves | |
output_supply = self.asset1_reserves | |
if not input_supply or not output_supply: | |
raise Exception('Pool has no liquidity!') | |
# k = input_supply * output_supply | |
# ignoring fees, k must remain constant | |
# (input_supply + asset_in) * (output_supply - amount_out) = k | |
k = input_supply * output_supply | |
asset_in_amount_minus_fee = (asset_in_amount * 997) / 1000 | |
swap_fees = asset_in_amount - asset_in_amount_minus_fee | |
asset_out_amount = output_supply - (k / (input_supply + asset_in_amount_minus_fee)) | |
amount_out = AssetAmount(asset_out, int(asset_out_amount)) | |
return amount_out | |
def main(): | |
trade = float(sys.argv[1]) if len(sys.argv) > 1 else 1000 | |
client = AlgodClient("", "https://mainnet-api.algonode.cloud") | |
pool_id = 777628254 # ALGO-USDC pool | |
pool = HumblePool(client, app_id=pool_id, N2NN=True) | |
print(f'Pool id: {pool.app_id}') | |
print(f'Asset1 reserves {pool.asset1}: {pool.asset1_reserves}') | |
print(f'Asset2 reserves {pool.asset2}: {pool.asset2_reserves}') | |
print(f'Price: {pool.asset2_reserves / pool.asset1_reserves:.6f}') | |
print(f'InvPrice: {pool.asset1_reserves / pool.asset2_reserves:.6f}') | |
amount1 = pool.asset1(trade * 10**pool.asset1.decimals) | |
amount2 = pool.asset2(trade * 10**pool.asset2.decimals) | |
hs_out1 = pool.fetch_fixed_input_swap_quote(amount1) | |
hs_out2 = pool.fetch_fixed_input_swap_quote(amount2) | |
print(f'quote for {amount1}: {hs_out1}') | |
print(f'quote for {amount2}: {hs_out2}') | |
if __name__ == '__main__': | |
main() |
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