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asset-issuer.py
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asset-issuer.py
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from stellar_sdk import Server, Network, Keypair, TransactionBuilder
import json
import requests
import argparse
# Command line interace will come eventually.
# Using argparse for now to allow for command line arguments.
parser = argparse.ArgumentParser(
description='Create asset with x supply and a basic market using half the supply.')
parser.add_argument('abbreviation', help='Currency code of asset')
parser.add_argument('supply', help='Total supply of asset')
parser.add_argument(
'market', help='Do you want to make a basic market for your asset? (y\n)')
args = parser.parse_args()
# Declaring global variable for testnet link.
TESTNET = 'https://horizon-testnet.stellar.org'
# Generate random keypairs and funding them with friendbot.
# Side note: It is common to use a Create Account operation to
# handle the cretion of the distributor account (or any account on mainnet).
# I didn't find it necessary to use for this implementation in order to keep the code
# clean and simple.
def generate_keypair():
friendbot = 'https://friendbot.stellar.org'
keypair = Keypair.random()
requests.get(friendbot, params={'addr': keypair.public_key})
print('Public key: ', keypair.public_key)
print('Private key: ', keypair.secret, '\n')
return keypair
# Create a trustline between distributing account and issuing account for asset.
def create_asset(issuing_keypair, distributing_keypair, asset_code):
# Talk to Horizon testnet instance.
server = Server(horizon_url=TESTNET)
# Fetch the current sequence number for the source account from Horizon.
source_account = server.load_account(distributing_keypair.public_key)
# Build transaction around trustline operation (creating asset).
transaction = (
TransactionBuilder(
source_account=source_account,
network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
base_fee=100, # too lazy to fetch :)
)
.append_change_trust_op(asset_code, issuing_keypair.public_key)
.build()
)
# Sign transaction with distributor private key.
transaction.sign(distributing_keypair)
# Submit signed transaction to Horizon.
response = server.submit_transaction(transaction)
print(json.dumps(response, indent=2))
# Send asset from issuing accout to distributing account.
def send_asset(issuing_keypair, distributing_keypair, asset_code, supply):
# Talk to Horizon testnet instance.
server = Server(horizon_url=TESTNET)
# Fetch the current sequence number for the source account from Horizon.
source_account = server.load_account(issuing_keypair.public_key)
# Build transaction around payment operation (sending asset to distributor).
transaction = (
TransactionBuilder(
source_account=source_account,
network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
base_fee=100, # too lazy to fetch :)
)
.append_payment_op(distributing_keypair.public_key, supply, asset_code, issuing_keypair.public_key)
.build()
)
# Sign transaction with issuing private key.
transaction.sign(issuing_keypair)
# Submit signed transaction to Horizon.
response = server.submit_transaction(transaction)
print(json.dumps(response, indent=2))
# Do some magic math to use a portion of the supply to make the market.
# By allowing too big of a market the distributor can run out of lumens;
# this function should solve such issues.
def market_supply(supply):
if int(supply) > 1000000:
_supply = int(500000 * 0.15) / 6
else:
_supply = int((int(supply) * 0.15) / 6)
return str(_supply)
# Make bids for the orderbook.
def make_bids(asset_code, issuing_keypair, distributing_keypair, market_supply):
# Talk to Horizon testnet instance.
server = Server(horizon_url=TESTNET)
# Fetch the current sequence number for the source account from Horizon.
source_account = server.load_account(distributing_keypair.public_key)
# Build transaction around manage buy offer operation (setting market bids).
transaction = (
TransactionBuilder(
source_account=source_account,
network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
base_fee=100, # too lazy to fetch :)
)
.append_manage_buy_offer_op('XLM', None, asset_code, issuing_keypair.public_key, market_supply, '.08')
.append_manage_buy_offer_op('XLM', None, asset_code, issuing_keypair.public_key, market_supply, '.09')
.append_manage_buy_offer_op('XLM', None, asset_code, issuing_keypair.public_key, market_supply, '.10')
.build()
)
# Sign transaction with distributor private key.
transaction.sign(distributing_keypair)
# Submit signed transaction to Horizon.
response = server.submit_transaction(transaction)
print(json.dumps(response, indent=2))
# Make asks for the orderbook.
def make_asks(asset_code, issuing_keypair, distributing_keypair, market_supply):
# Talk to Horizon testnet instance.
server = Server(horizon_url=TESTNET)
# Fetch the current sequence number for the source account from Horizon.
source_account = server.load_account(distributing_keypair.public_key)
# Build transaction around manage sell offer operation (setting market asks).
transaction = (
TransactionBuilder(
source_account=source_account,
network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
base_fee=100, # too lazy to fetch :)
)
.append_manage_sell_offer_op(asset_code, issuing_keypair.public_key, 'XLM', None, market_supply, '.11')
.append_manage_sell_offer_op(asset_code, issuing_keypair.public_key, 'XLM', None, market_supply, '.12')
.append_manage_sell_offer_op(asset_code, issuing_keypair.public_key, 'XLM', None, market_supply, '.13')
.build()
)
# Sign transaction with distributor private key.
transaction.sign(distributing_keypair)
# Submit signed transaction to Horizon.
response = server.submit_transaction(transaction)
print(json.dumps(response, indent=2))
# Encapsulate all that cool stuff up above.
def app(asset_code, supply, market):
print('\nIssuer Keypair')
issuer = generate_keypair()
print('Distributor Keypair')
distributor = generate_keypair()
print('Creating asset...')
create_asset(issuer, distributor, asset_code)
print('\nSending asset...')
send_asset(issuer, distributor, asset_code, supply)
if market == 'y':
# Take a % of the total supply and use it to make a market
mkt_supply = market_supply(supply)
# Create a basic market with half the supply
print('\nMaking market bids...')
make_bids(asset_code, issuer, distributor, mkt_supply)
print('\nMaking market asks...')
make_asks(asset_code, issuer, distributor, mkt_supply)
else:
print('\nNo market made.')
if __name__ == '__main__':
app(args.abbreviation, args.supply, args.market)