def create_invoice(
*,
wallet_id: str,
amount: int,
memo: str,
description_hash: Optional[bytes] = None,
extra: Optional[Dict] = None,
) -> Tuple[str, str]:
invoice_memo = None if description_hash else memo
storeable_memo = memo
ok, checking_id, payment_request, error_message = WALLET.create_invoice(
amount=amount, memo=invoice_memo, description_hash=description_hash)
if not ok:
raise Exception(error_message or "Unexpected backend error.")
invoice = bolt11.decode(payment_request)
amount_msat = amount * 1000
create_payment(
wallet_id=wallet_id,
checking_id=checking_id,
payment_request=payment_request,
payment_hash=invoice.payment_hash,
amount=amount_msat,
memo=storeable_memo,
extra=extra,
)
g.db.commit()
return invoice.payment_hash, payment_request
def validate_action(self, query: Dict[str, str]) -> None:
tag = self.tag
params = json.loads(self.params)
# Perform tag-specific checks.
if tag == "withdrawRequest":
for field in ["pr"]:
if not field in query:
raise LnurlValidationError(
f'Missing required parameter: "{field}"')
# Check the bolt11 invoice(s) provided.
pr = query["pr"]
if "," in pr:
raise LnurlValidationError(
"Multiple payment requests not supported")
try:
invoice = bolt11.decode(pr)
except ValueError:
raise LnurlValidationError(
'Invalid parameter ("pr"): Lightning payment request expected'
)
if invoice.amount_msat < params["minWithdrawable"]:
raise LnurlValidationError(
'Amount in invoice must be greater than or equal to "minWithdrawable"'
)
if invoice.amount_msat > params["maxWithdrawable"]:
raise LnurlValidationError(
'Amount in invoice must be less than or equal to "maxWithdrawable"'
)
else:
raise LnurlValidationError(f'Unknown subprotocol: "{tag}"')
async def api_payments_decode():
try:
if g.data["data"][:5] == "LNURL":
url = lnurl.decode(g.data["data"])
return (
jsonify({"domain": url}),
HTTPStatus.OK,
)
else:
invoice = bolt11.decode(g.data["data"])
return (
jsonify(
{
"payment_hash": invoice.payment_hash,
"amount_msat": invoice.amount_msat,
"description": invoice.description,
"description_hash": invoice.description_hash,
"payee": invoice.payee,
"date": invoice.date,
"expiry": invoice.expiry,
"secret": invoice.secret,
"route_hints": invoice.route_hints,
"min_final_cltv_expiry": invoice.min_final_cltv_expiry,
}
),
HTTPStatus.OK,
)
except:
return jsonify({"message": "Failed to decode"}), HTTPStatus.BAD_REQUEST
def lndhub_payinvoice():
try:
pay_invoice(
wallet_id=g.wallet.id,
payment_request=g.data["invoice"],
extra={"tag": "lndhub"},
)
except Exception as e:
return jsonify({
"error": True,
"code": 10,
"message": "Payment failed: " + str(e),
})
invoice: bolt11.Invoice = bolt11.decode(g.data["invoice"])
return jsonify({
"payment_error": "",
"payment_preimage": "0" * 64,
"route": {},
"payment_hash": invoice.payment_hash,
"decoded": decoded_as_lndhub(invoice),
"fee_msat": 0,
"type": "paid_invoice",
"fee": 0,
"value": invoice.amount_msat / 1000,
"timestamp": int(time.time()),
"memo": invoice.description,
})
def delete_expired_invoices() -> None:
rows = g.db.fetchall(
"""
SELECT bolt11
FROM apipayments
WHERE pending = 1 AND amount > 0 AND time < strftime('%s', 'now') - 86400
"""
)
for (payment_request,) in rows:
try:
invoice = bolt11.decode(payment_request)
except:
continue
expiration_date = datetime.datetime.fromtimestamp(invoice.date + invoice.expiry)
if expiration_date > datetime.datetime.utcnow():
continue
g.db.execute(
"""
DELETE FROM apipayments
WHERE pending = 1 AND hash = ?
""",
(invoice.payment_hash,),
)
async def delete_expired_invoices(conn: Optional[Connection] = None, ) -> None:
# first we delete all invoices older than one month
await (conn or db).execute("""
DELETE FROM apipayments
WHERE pending = 1 AND amount > 0 AND time < strftime('%s', 'now') - 2592000
""")
# then we delete all expired invoices, checking one by one
rows = await (conn or db).fetchall("""
SELECT bolt11
FROM apipayments
WHERE pending = 1
AND bolt11 IS NOT NULL
AND amount > 0 AND time < strftime('%s', 'now') - 86400
""")
for (payment_request, ) in rows:
try:
invoice = bolt11.decode(payment_request)
except:
continue
expiration_date = datetime.datetime.fromtimestamp(invoice.date +
invoice.expiry)
if expiration_date > datetime.datetime.utcnow():
continue
await (conn or db).execute(
"""
DELETE FROM apipayments
WHERE pending = 1 AND hash = ?
""",
(invoice.payment_hash, ),
)
async def api_public_payment_longpolling(payment_hash):
payment = await get_standalone_payment(payment_hash)
if not payment:
return jsonify({"message":
"Payment does not exist."}), HTTPStatus.NOT_FOUND
elif not payment.pending:
return jsonify({"status": "paid"}), HTTPStatus.OK
try:
invoice = bolt11.decode(payment.bolt11)
expiration = datetime.datetime.fromtimestamp(invoice.date +
invoice.expiry)
if expiration < datetime.datetime.now():
return jsonify({"status": "expired"}), HTTPStatus.OK
except:
return jsonify({"message":
"Invalid bolt11 invoice."}), HTTPStatus.BAD_REQUEST
send_payment, receive_payment = trio.open_memory_channel(0)
print("adding standalone invoice listener", payment_hash, send_payment)
api_invoice_listeners.append(send_payment)
async for payment in receive_payment:
if payment.payment_hash == payment_hash:
return jsonify({"status": "paid"}), HTTPStatus.OK
async def lndhub_addinvoice():
try:
_, pr = await create_invoice(
wallet_id=g.wallet.id,
amount=int(g.data["amt"]),
memo=g.data["memo"],
extra={"tag": "lndhub"},
)
except Exception as e:
return jsonify(
{
"error": True,
"code": 7,
"message": "Failed to create invoice: " + str(e),
}
)
invoice = bolt11.decode(pr)
return jsonify(
{
"pay_req": pr,
"payment_request": pr,
"add_index": "500",
"r_hash": to_buffer(invoice.payment_hash),
"hash": invoice.payment_hash,
}
)
def GetInvoiceFromDbRecord(self, invoice, index):
payment_request = invoice[6]
pending = invoice[1]
# IF IT IS PAID (NOT PENDING)
if (pending == 0):
settled = True
state = ln.Invoice.InvoiceState.SETTLED
amt_paid_sat = int(invoice[2] / 1000)
settle_date = invoice[5]
else:
settled = False
state = ln.Invoice.InvoiceState.OPEN
amt_paid_sat = 0
settle_date = None
decoded = bolt11.decode(payment_request)
payment_hash = decoded.payment_hash
rhash = bytes.fromhex(payment_hash)
return ln.Invoice(value=int(invoice[2] / 1000),
memo=invoice[4],
creation_date=invoice[5],
payment_request=invoice[6],
r_hash=rhash,
add_index=index,
expiry=decoded.expiry,
state=state,
settled=settled,
amt_paid_sat=amt_paid_sat,
settle_date=settle_date)
def create_invoice(wallet_id: int,
amount: int,
memo: str,
description_hash: Optional[bytes] = None,
extra: Optional[Dict] = None,
webhook: Optional[str] = None) -> Tuple[str, str]:
invoice_memo = None if description_hash else memo
storeable_memo = memo
ok, checking_id, payment_request, error_message = WALLET.create_invoice(
amount=amount, memo=invoice_memo, description_hash=description_hash)
if not ok:
raise Exception(error_message or "Unexpected backend error.")
invoice = bolt11.decode(payment_request)
amount_msat = amount * 1000
print(amount_msat)
Payment.objects.create(wallet_id=wallet_id,
checking_id=checking_id,
payment_request=payment_request,
payment_hash=invoice.payment_hash,
amount=amount_msat,
memo=storeable_memo,
extra=json.dumps(extra) if extra and extra != {}
and type(extra) is dict else None,
webhook=webhook)
return invoice.payment_hash, payment_request
async def api_payments_create_invoice():
if "description_hash" in g.data:
description_hash = unhexlify(g.data["description_hash"])
memo = ""
else:
description_hash = b""
memo = g.data["memo"]
try:
payment_hash, payment_request = create_invoice(
wallet_id=g.wallet.id,
amount=g.data["amount"],
memo=memo,
description_hash=description_hash)
except Exception as e:
g.db.rollback()
return jsonify({"message": str(e)}), HTTPStatus.INTERNAL_SERVER_ERROR
invoice = bolt11.decode(payment_request)
return (
jsonify({
"payment_hash": invoice.payment_hash,
"payment_request": payment_request,
# maintain backwards compatibility with API clients:
"checking_id": invoice.payment_hash,
}),
HTTPStatus.CREATED,
)
async def create_invoice(
*,
wallet_id: str,
amount: int, # in satoshis
memo: str,
description_hash: Optional[bytes] = None,
extra: Optional[Dict] = None,
webhook: Optional[str] = None,
conn: Optional[Connection] = None,
) -> Tuple[str, str]:
invoice_memo = None if description_hash else memo
storeable_memo = memo
ok, checking_id, payment_request, error_message = await WALLET.create_invoice(
amount=amount, memo=invoice_memo, description_hash=description_hash)
if not ok:
raise InvoiceFailure(error_message or "Unexpected backend error.")
invoice = bolt11.decode(payment_request)
amount_msat = amount * 1000
await create_payment(
wallet_id=wallet_id,
checking_id=checking_id,
payment_request=payment_request,
payment_hash=invoice.payment_hash,
amount=amount_msat,
memo=storeable_memo,
extra=extra,
webhook=webhook,
conn=conn,
)
return invoice.payment_hash, payment_request
async def api_payments_create_invoice():
if "description_hash" in g.data:
description_hash = unhexlify(g.data["description_hash"])
memo = ""
else:
description_hash = b""
memo = g.data["memo"]
try:
payment_hash, payment_request = await create_invoice(
wallet_id=g.wallet.id,
amount=g.data["amount"],
memo=memo,
description_hash=description_hash,
extra=g.data.get("extra"),
webhook=g.data.get("webhook"),
)
except Exception as exc:
await db.rollback()
raise exc
await db.commit()
invoice = bolt11.decode(payment_request)
lnurl_response: Union[None, bool, str] = None
if g.data.get("lnurl_callback"):
async with httpx.AsyncClient() as client:
try:
r = await client.get(
g.data["lnurl_callback"],
params={"pr": payment_request},
timeout=10,
)
if r.is_error:
lnurl_response = r.text
else:
resp = json.loads(r.text)
if resp["status"] != "OK":
lnurl_response = resp["reason"]
else:
lnurl_response = True
except (httpx.ConnectError, httpx.RequestError):
lnurl_response = False
return (
jsonify(
{
"payment_hash": invoice.payment_hash,
"payment_request": payment_request,
# maintain backwards compatibility with API clients:
"checking_id": invoice.payment_hash,
"lnurl_response": lnurl_response,
}
),
HTTPStatus.CREATED,
)
def save_link_invoice(link_id: int, payment_request: str) -> None:
inv = bolt11.decode(payment_request)
with open_ext_db("lnurlp") as db:
db.execute(
"""
INSERT INTO invoices (pay_link, payment_hash, expiry)
VALUES (?, ?, ?)
""",
(link_id, inv.payment_hash, inv.expiry),
)
async def lnurlwallet():
memo = "LNbits LNURL funding"
try:
withdraw_res = handle_lnurl(request.args.get("lightning"))
if not withdraw_res.ok:
abort(HTTPStatus.BAD_REQUEST, f"Could not process LNURL-withdraw: {withdraw_res.error_msg}")
if not isinstance(withdraw_res, LnurlWithdrawResponse):
abort(HTTPStatus.BAD_REQUEST, "Not a valid LNURL-withdraw.")
except LnurlException:
abort(HTTPStatus.INTERNAL_SERVER_ERROR, "Could not process LNURL-withdraw.")
try:
ok, checking_id, payment_request, error_message = WALLET.create_invoice(withdraw_res.max_sats, memo)
except Exception as e:
ok, error_message = False, str(e)
if not ok:
abort(HTTPStatus.INTERNAL_SERVER_ERROR, error_message)
r = requests.get(
withdraw_res.callback.base,
params={**withdraw_res.callback.query_params, **{"k1": withdraw_res.k1, "pr": payment_request}},
)
if not r.ok:
abort(HTTPStatus.INTERNAL_SERVER_ERROR, "Could not process LNURL-withdraw.")
inv = bolt11.decode(payment_request)
for i in range(10):
invoice_status = WALLET.get_invoice_status(checking_id)
sleep(i)
if not invoice_status.paid:
continue
break
user = get_user(create_account().id)
wallet = create_wallet(user_id=user.id)
create_payment(
wallet_id=wallet.id,
checking_id=checking_id,
amount=withdraw_res.max_sats * 1000,
memo=memo,
pending=invoice_status.pending,
payment_request=payment_request,
payment_hash=inv.payment_hash,
)
return redirect(url_for("core.wallet", usr=user.id, wal=wallet.id))
def DecodePayReq(self, request, context):
decoded = bolt11.decode(request.pay_req)
try:
pr = ln.PayReq(timestamp=int(time.time()),
destination=decoded.payee,
payment_hash=decoded.payment_hash,
num_satoshis=int(decoded.amount_msat / 1000),
expiry=decoded.expiry,
description=decoded.description,
description_hash=decoded.description_hash,
payment_addr=bytes.fromhex(decoded.payee),
features={})
except Exception as inst:
print("error")
print(inst)
return pr
async def api_public_payment_longpolling(payment_hash):
payment = await get_standalone_payment(payment_hash)
if not payment:
return jsonify({"message": "Payment does not exist."}), HTTPStatus.NOT_FOUND
elif not payment.pending:
return jsonify({"status": "paid"}), HTTPStatus.OK
try:
invoice = bolt11.decode(payment.bolt11)
expiration = datetime.datetime.fromtimestamp(invoice.date + invoice.expiry)
if expiration < datetime.datetime.now():
return jsonify({"status": "expired"}), HTTPStatus.OK
except:
return jsonify({"message": "Invalid bolt11 invoice."}), HTTPStatus.BAD_REQUEST
send_payment, receive_payment = trio.open_memory_channel(0)
print("adding standalone invoice listener", payment_hash, send_payment)
api_invoice_listeners.append(send_payment)
response = None
async def payment_info_receiver(cancel_scope):
async for payment in receive_payment:
if payment.payment_hash == payment_hash:
nonlocal response
response = (jsonify({"status": "paid"}), HTTPStatus.OK)
cancel_scope.cancel()
async def timeouter(cancel_scope):
await trio.sleep(45)
cancel_scope.cancel()
async with trio.open_nursery() as nursery:
nursery.start_soon(payment_info_receiver, nursery.cancel_scope)
nursery.start_soon(timeouter, nursery.cancel_scope)
if response:
return response
else:
return jsonify({"message": "timeout"}), HTTPStatus.REQUEST_TIMEOUT
async def pay_invoice(self, bolt11: str,
fee_limit_msat: int) -> PaymentResponse:
invoice = lnbits_bolt11.decode(bolt11)
fee_limit_percent = fee_limit_msat / invoice.amount_msat * 100
payload = {
"bolt11": bolt11,
"maxfeepercent": "{:.11}".format(fee_limit_percent),
"exemptfee":
0 # so fee_limit_percent is applied even on payments with fee under 5000 millisatoshi (which is default value of exemptfee)
}
try:
r = self.ln.call("pay", payload)
except RpcError as exc:
return PaymentResponse(False, None, 0, None, str(exc))
fee_msat = r["msatoshi_sent"] - r["msatoshi"]
preimage = r["payment_preimage"]
return PaymentResponse(True, r["payment_hash"], fee_msat, preimage,
None)
def AddInvoice(self, request, context):
print("s" + request.memo + "s")
memo = request.memo
if not memo:
memo = "new request"
params = {'out': False, 'amount': request.value, 'memo': memo}
invoices = self.GetInvoices(context)
add_index = len(invoices) + 1
print("AddInvoice")
test_url = "https://ptsv2.com/t/qu294-1600515698/post"
resp = self.DoPostWithApiKey(self.add_invoice_url, params, context)
#resp = self.DoPostWithApiKey(test_url, params, context)
payment_request = resp["payment_request"]
decoded = bolt11.decode(payment_request)
payment_hash = decoded.payment_hash
rhash = bytes.fromhex(payment_hash)
return ln.AddInvoiceResponse(
# add_index=resp["checking_id"], no tengo index en la response de lnbits
# add_index=int(time.time()),
add_index=add_index,
r_hash=rhash,
payment_request=payment_request)
def pay_invoice(wallet_id: int,
payment_request: str,
max_sat: Optional[int] = None,
extra: Optional[Dict] = None,
description: str = "") -> str:
temp_id: str = f"temp_{shortuuid.uuid()}"
internal_id: str = f"internal_{shortuuid.uuid()}"
invoice: Invoice = bolt11.decode(payment_request)
if invoice.amount_msat == 0:
raise ValueError("Amountless invoices not supported.")
if max_sat and invoice.amount_msat > max_sat * 1000:
raise ValueError("Amount in invoice is too high.")
# put all parameters that don't change here
PaymentKwargs = TypedDict(
"PaymentKwargs",
{
"wallet_id": str,
"payment_request": str,
"payment_hash": str,
"amount": int,
"memo": str,
"extra": Optional[Dict],
},
)
payment_kwargs: PaymentKwargs = dict(wallet_id=wallet_id,
payment_request=payment_request,
payment_hash=invoice.payment_hash,
amount=-invoice.amount_msat,
memo=description
or invoice.description or "",
extra=extra)
try:
payment = Payment.objects.get(payment_hash=invoice.payment_hash,
pending=True,
amount__gt=0)
except Payment.DoesNotExist:
payment = None
if payment:
Payment.objects.create(checking_id=internal_id,
fee=0,
pending=False,
**payment_kwargs)
else:
fee_reserve = max(1000, int(invoice.amount_msat * 0.01))
Payment.objects.create(checking_id=temp_id,
fee=-fee_reserve,
**payment_kwargs)
try:
wallet = Wallet.objects.get(id=wallet_id)
except Wallet.DoesNotExist:
raise ValueError("Wallet {} not found".format(wallet_id))
if wallet.balance < 0:
raise PermissionError("Insufficient balance")
if payment:
Payment.objects.get(checking_id=payment.checking_id, pending=False)
else:
ln_payment: PaymentResponse = WALLET.pay_invoice(payment_request)
if ln_payment.ok and ln_payment.checking_id:
Payment.objects.create(checking_id=ln_payment.checking_id,
fee=ln_payment.fee_msat,
preimage=ln_payment.preimage,
pending=False,
**payment_kwargs)
Payment.objects.filter(checking_id=temp_id).delete()
else:
Payment.objects.filter(checking_id=temp_id).delete()
raise Exception(payment.error_message
or "Failed to pay_invoice on backend")
return invoice.payment_hash
async def api_payments_create_invoice():
if "description_hash" in g.data:
description_hash = unhexlify(g.data["description_hash"])
memo = ""
else:
description_hash = b""
memo = g.data["memo"]
async with db.connect() as conn:
try:
payment_hash, payment_request = await create_invoice(
wallet_id=g.wallet.id,
amount=g.data["amount"],
memo=memo,
description_hash=description_hash,
extra=g.data.get("extra"),
webhook=g.data.get("webhook"),
conn=conn,
)
except InvoiceFailure as e:
return jsonify({"message": str(e)}), 520
except Exception as exc:
raise exc
invoice = bolt11.decode(payment_request)
lnurl_response: Union[None, bool, str] = None
if g.data.get("lnurl_callback"):
if "lnurl_balance_check" in g.data:
save_balance_check(g.wallet.id, g.data["lnurl_balance_check"])
async with httpx.AsyncClient() as client:
try:
r = await client.get(
g.data["lnurl_callback"],
params={
"pr":
payment_request,
"balanceNotify":
url_for(
"core.lnurl_balance_notify",
service=urlparse(g.data["lnurl_callback"]).netloc,
wal=g.wallet.id,
_external=True,
),
},
timeout=10,
)
if r.is_error:
lnurl_response = r.text
else:
resp = json.loads(r.text)
if resp["status"] != "OK":
lnurl_response = resp["reason"]
else:
lnurl_response = True
except (httpx.ConnectError, httpx.RequestError):
lnurl_response = False
return (
jsonify({
"payment_hash": invoice.payment_hash,
"payment_request": payment_request,
# maintain backwards compatibility with API clients:
"checking_id": invoice.payment_hash,
"lnurl_response": lnurl_response,
}),
HTTPStatus.CREATED,
)
async def api_payments_pay_lnurl():
domain = urlparse(g.data["callback"]).netloc
async with httpx.AsyncClient() as client:
try:
r = await client.get(
g.data["callback"],
params={
"amount": g.data["amount"],
"comment": g.data["comment"]
},
timeout=40,
)
if r.is_error:
return jsonify({"message":
"failed to connect"}), HTTPStatus.BAD_REQUEST
except (httpx.ConnectError, httpx.RequestError):
return jsonify({"message":
"failed to connect"}), HTTPStatus.BAD_REQUEST
params = json.loads(r.text)
if params.get("status") == "ERROR":
return (
jsonify(
{"message": f"{domain} said: '{params.get('reason', '')}'"}),
HTTPStatus.BAD_REQUEST,
)
invoice = bolt11.decode(params["pr"])
if invoice.amount_msat != g.data["amount"]:
return (
jsonify({
"message":
f"{domain} returned an invalid invoice. Expected {g.data['amount']} msat, got {invoice.amount_msat}."
}),
HTTPStatus.BAD_REQUEST,
)
if invoice.description_hash != g.data["description_hash"]:
return (
jsonify({
"message":
f"{domain} returned an invalid invoice. Expected description_hash == {g.data['description_hash']}, got {invoice.description_hash}."
}),
HTTPStatus.BAD_REQUEST,
)
extra = {}
if params.get("successAction"):
extra["success_action"] = params["successAction"]
if g.data["comment"]:
extra["comment"] = g.data["comment"]
payment_hash = await pay_invoice(
wallet_id=g.wallet.id,
payment_request=params["pr"],
description=g.data.get("description", ""),
extra=extra,
)
return (
jsonify({
"success_action": params.get("successAction"),
"payment_hash": payment_hash,
# maintain backwards compatibility with API clients:
"checking_id": payment_hash,
}),
HTTPStatus.CREATED,
)
def lndhub_decodeinvoice():
invoice = request.args.get("invoice")
inv = bolt11.decode(invoice)
return jsonify(decoded_as_lndhub(inv))
def pay_invoice(*,
wallet_id: str,
payment_request: str,
max_sat: Optional[int] = None,
extra: Optional[Dict] = None) -> str:
temp_id = f"temp_{urlsafe_short_hash()}"
internal_id = f"internal_{urlsafe_short_hash()}"
invoice = bolt11.decode(payment_request)
if invoice.amount_msat == 0:
raise ValueError("Amountless invoices not supported.")
if max_sat and invoice.amount_msat > max_sat * 1000:
raise ValueError("Amount in invoice is too high.")
# put all parameters that don't change here
PaymentKwargs = TypedDict(
"PaymentKwargs",
{
"wallet_id": str,
"payment_request": str,
"payment_hash": str,
"amount": int,
"memo": str,
"extra": Optional[Dict],
},
)
payment_kwargs: PaymentKwargs = dict(
wallet_id=wallet_id,
payment_request=payment_request,
payment_hash=invoice.payment_hash,
amount=-invoice.amount_msat,
memo=invoice.description or "",
extra=extra,
)
# check_internal() returns the checking_id of the invoice we're waiting for
internal = check_internal(invoice.payment_hash)
if internal:
# create a new payment from this wallet
create_payment(checking_id=internal_id,
fee=0,
pending=False,
**payment_kwargs)
else:
# create a temporary payment here so we can check if
# the balance is enough in the next step
fee_reserve = max(1000, int(invoice.amount_msat * 0.01))
create_payment(checking_id=temp_id, fee=-fee_reserve, **payment_kwargs)
# do the balance check
wallet = get_wallet(wallet_id)
assert wallet
if wallet.balance_msat < 0:
g.db.rollback()
raise PermissionError("Insufficient balance.")
else:
g.db.commit()
if internal:
# mark the invoice from the other side as not pending anymore
# so the other side only has access to his new money when we are sure
# the payer has enough to deduct from
update_payment_status(checking_id=internal, pending=False)
else:
# actually pay the external invoice
ok, checking_id, fee_msat, error_message = WALLET.pay_invoice(
payment_request)
if ok:
create_payment(checking_id=checking_id,
fee=fee_msat,
**payment_kwargs)
delete_payment(temp_id)
else:
raise Exception(error_message
or "Failed to pay_invoice on backend.")
g.db.commit()
return invoice.payment_hash
async def pay_invoice(
*,
wallet_id: str,
payment_request: str,
max_sat: Optional[int] = None,
extra: Optional[Dict] = None,
description: str = "",
conn: Optional[Connection] = None,
) -> str:
invoice = bolt11.decode(payment_request)
fee_reserve_msat = fee_reserve(invoice.amount_msat)
async with (db.reuse_conn(conn) if conn else db.connect()) as conn:
temp_id = f"temp_{urlsafe_short_hash()}"
internal_id = f"internal_{urlsafe_short_hash()}"
if invoice.amount_msat == 0:
raise ValueError("Amountless invoices not supported.")
if max_sat and invoice.amount_msat > max_sat * 1000:
raise ValueError("Amount in invoice is too high.")
# put all parameters that don't change here
PaymentKwargs = TypedDict(
"PaymentKwargs",
{
"wallet_id": str,
"payment_request": str,
"payment_hash": str,
"amount": int,
"memo": str,
"extra": Optional[Dict],
},
)
payment_kwargs: PaymentKwargs = dict(
wallet_id=wallet_id,
payment_request=payment_request,
payment_hash=invoice.payment_hash,
amount=-invoice.amount_msat,
memo=description or invoice.description or "",
extra=extra,
)
# check_internal() returns the checking_id of the invoice we're waiting for
internal_checking_id = await check_internal(invoice.payment_hash,
conn=conn)
if internal_checking_id:
# create a new payment from this wallet
await create_payment(
checking_id=internal_id,
fee=0,
pending=False,
conn=conn,
**payment_kwargs,
)
else:
# create a temporary payment here so we can check if
# the balance is enough in the next step
await create_payment(
checking_id=temp_id,
fee=-fee_reserve_msat,
conn=conn,
**payment_kwargs,
)
# do the balance check
wallet = await get_wallet(wallet_id, conn=conn)
assert wallet
if wallet.balance_msat < 0:
raise PermissionError("Insufficient balance.")
if internal_checking_id:
# mark the invoice from the other side as not pending anymore
# so the other side only has access to his new money when we are sure
# the payer has enough to deduct from
async with db.connect() as conn:
await update_payment_status(
checking_id=internal_checking_id,
pending=False,
conn=conn,
)
# notify receiver asynchronously
from lnbits.tasks import internal_invoice_paid
await internal_invoice_paid.send(internal_checking_id)
else:
# actually pay the external invoice
payment: PaymentResponse = await WALLET.pay_invoice(
payment_request, fee_reserve_msat)
if payment.checking_id:
async with db.connect() as conn:
await create_payment(
checking_id=payment.checking_id,
fee=payment.fee_msat,
preimage=payment.preimage,
pending=payment.ok == None,
conn=conn,
**payment_kwargs,
)
await delete_payment(temp_id, conn=conn)
else:
async with db.connect() as conn:
await delete_payment(temp_id, conn=conn)
raise PaymentFailure(
payment.error_message or
"Payment failed, but backend didn't give us an error message.")
return invoice.payment_hash
