137 lines
4.8 KiB
Python
137 lines
4.8 KiB
Python
import os
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import asyncio
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import attr
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import random
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from collections import defaultdict
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from aiohttp import ClientResponse
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from aiohttp import web, client_exceptions
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from aiorpcx import timeout_after, TaskTimeout, ignore_after
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from aiorpcx import NetAddress
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from electrum.util import log_exceptions, ignore_exceptions
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from electrum.logging import Logger
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from electrum.util import EventListener, event_listener
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from electrum.invoices import PR_PAID, PR_EXPIRED
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class SwapServer(Logger, EventListener):
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"""
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public API:
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- getpairs
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- createswap
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"""
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WWW_DIR = os.path.join(os.path.dirname(__file__), 'www')
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def __init__(self, config, wallet):
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Logger.__init__(self)
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self.config = config
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self.wallet = wallet
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self.addr = NetAddress.from_string(self.config.SWAPSERVER_ADDRESS)
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self.register_callbacks() # eventlistener
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self.pending = defaultdict(asyncio.Event)
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self.pending_msg = {}
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@ignore_exceptions
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@log_exceptions
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async def run(self):
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app = web.Application()
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app.add_routes([web.get('/api/getpairs', self.get_pairs)])
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app.add_routes([web.post('/api/createswap', self.create_swap)])
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runner = web.AppRunner(app)
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await runner.setup()
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site = web.TCPSite(runner, host=str(self.addr.host), port=self.addr.port, ssl_context=self.config.get_ssl_context())
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await site.start()
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self.logger.info(f"now running and listening. addr={self.addr}")
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async def get_pairs(self, r):
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sm = self.wallet.lnworker.swap_manager
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sm.init_pairs()
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pairs = {
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"info": [],
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"warnings": [],
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"pairs": {
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"BTC/BTC": {
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"rate": 1,
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"limits": {
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"maximal": sm._max_amount,
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"minimal": sm._min_amount,
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"maximalZeroConf": {
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"baseAsset": 0,
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"quoteAsset": 0
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}
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},
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"fees": {
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"percentage": 0.5,
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"minerFees": {
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"baseAsset": {
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"normal": sm.normal_fee,
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"reverse": {
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"claim": sm.claim_fee,
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"lockup": sm.lockup_fee
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}
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},
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"quoteAsset": {
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"normal": sm.normal_fee,
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"reverse": {
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"claim": sm.claim_fee,
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"lockup": sm.lockup_fee
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}
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}
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}
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}
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}
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}
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}
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return web.json_response(pairs)
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async def create_swap(self, r):
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sm = self.wallet.lnworker.swap_manager
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sm.init_pairs()
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request = await r.json()
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req_type = request['type']
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assert request['pairId'] == 'BTC/BTC'
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if req_type == 'reversesubmarine':
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lightning_amount_sat=request['invoiceAmount']
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payment_hash=bytes.fromhex(request['preimageHash'])
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their_pubkey=bytes.fromhex(request['claimPublicKey'])
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assert len(payment_hash) == 32
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assert len(their_pubkey) == 33
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swap, payment_hash, invoice, prepay_invoice = sm.add_server_swap(
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lightning_amount_sat=lightning_amount_sat,
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payment_hash=payment_hash,
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their_pubkey=their_pubkey
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)
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response = {
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'id': payment_hash.hex(),
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'invoice': invoice,
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'minerFeeInvoice': prepay_invoice,
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'lockupAddress': swap.lockup_address,
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'redeemScript': swap.redeem_script.hex(),
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'timeoutBlockHeight': swap.locktime,
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"onchainAmount": swap.onchain_amount,
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}
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elif req_type == 'submarine':
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their_invoice=request['invoice']
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their_pubkey=bytes.fromhex(request['refundPublicKey'])
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assert len(their_pubkey) == 33
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swap, payment_hash, invoice, prepay_invoice = sm.add_server_swap(
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invoice=their_invoice,
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their_pubkey=their_pubkey
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)
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response = {
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"id": payment_hash.hex(),
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"acceptZeroConf": False,
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"expectedAmount": swap.onchain_amount,
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"timeoutBlockHeight": swap.locktime,
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"address": swap.lockup_address,
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"redeemScript": swap.redeem_script.hex()
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}
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else:
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raise Exception('unsupported request type:' + req_type)
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return web.json_response(response)
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