unable to send, no routes provided (but route is there)

[Koshy11]

Hello,

I have:

• rebalance-lnd
• LND: 0.6.1-beta

list of channels works... finding routes works... but when i try to pay the route i get the following error:

$ python rebalance.py -t 17 -a 1000
Sending 1,000 satoshis to rebalance to channel with ID 63xxxxxxxxxxxxxxxx
requesting 15 routes from lnd, please wait.
lnd returned 1 routes that will now be tested
Trying route #1
63xxxxxxxxxxxxxxxx -> 62xxxxxxxxxxxxxxxx -> 63xxxxxxxxxxxxxxxx
Traceback (most recent call last):
File "rebalance.py", line 223, in
main()
File "rebalance.py", line 62, in main
response = Logic(lnd, first_hop_channel_id, last_hop_channel, amount, channel_ratio, max_fee_factor).rebalance()
File "/usr/local/src/rebalance-lnd/logic.py", line 48, in rebalance
response = self.lnd.send_payment(payment_request, [route])
File "/usr/local/src/rebalance-lnd/lnd.py", line 98, in send_payment
return self.stub.SendToRouteSync(request)
File "/usr/lib64/python2.7/site-packages/grpc/_channel.py", line 565, in call
return _end_unary_response_blocking(state, call, False, None)
File "/usr/lib64/python2.7/site-packages/grpc/_channel.py", line 467, in _end_unary_response_blocking
raise _Rendezvous(state, None, None, deadline)
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
status = StatusCode.UNKNOWN
details = "unable to send, no routes provided"
debug_error_string = "{"created":"@1559085040.643817147","description":"Error received from peer ipv4:127.0.0.1:10009","file":"src/core/lib/surface/call.cc","file_line":1046,"grpc_message":"unable to send, no routes provided","grpc_status":2}"

is this issue with LND or rebalance-lnd? any ideas?

[C-Otto]

lnd complains "no routes provided", but according to the code exactly one route should have been forwarded to lnd. Could you add a debug line and try again?

lnd.py, at the top:
add import sys

At the bottom, change to add a debug statement:

def send_payment(self, payment_request, routes):
        payment_hash = payment_request.payment_hash
        request = ln.SendToRouteRequest()

        request.payment_hash_string = payment_hash
        request.routes.extend(routes)

        sys.stderr.write(repr(request)) # this line is added
        return self.stub.SendToRouteSync(request)

[mariodian]

I have the same issue both with rebalance-lnd and lndmanage as well. Seems this issue is related to LND?

[C-Otto]

I think so, too. Please provide more information if rebalance-lnd is to blame :)