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add pack_channels function #6

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Merged
renepickhardt merged 1 commit into from
May 10, 2020
Merged

add pack_channels function #6

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33 changes: 26 additions & 7 deletions balancesharing/balancesharing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -70,11 +70,27 @@ def get_channel(channels, peer_id):
return None


def encode_reply_foaf_balances(short_channels, amt_to_rebalance, plugin):
def pack_channels(channels, plugin):
# structure: blockheight 4 byte, index 2 byte, output 2 byte
channels_packed = []
for ch in channels:
nums = ch.split('x')
if len(nums) != 3:
break
ch_packed = struct.pack("!LHH", int(nums[0]),
int(nums[1]), int(nums[2]))
channels_packed.append(ch_packed)
plugin.log("channel: " + ch + " " + str(ch_packed))

return channels_packed


def encode_reply_foaf_balances(short_channels, flow_value, amt_to_rebalance, plugin):
"""Encode flow_value and amt_to_rebalance"""
"""
H -> type: short
32s -> chain_hash: 32byte char
c -> flow_value: char
Q -> timestamp: unsigned long
Q -> amt_to_rebalance: unsigned long long
H -> number_of_short_channels: unsigned short
Expand All @@ -98,9 +114,10 @@ def encode_reply_foaf_balances(short_channels, amt_to_rebalance, plugin):
channel_array_sign = str(number_of_short_channels * 8) + 's'
plugin.log("Channel sign: {channel_array_sign}"
.format(channel_array_sign=channel_array_sign))
pack_channels(short_channels, plugin)
return hexlify(struct.pack(
"!H32sQQH", REPLY_FOAF_BALANCES, CHAIN_HASH.encode('ASCII'),
timestamp, number_of_short_channels, amt_to_rebalance)
"!H32scQQH", REPLY_FOAF_BALANCES, CHAIN_HASH.encode('ASCII'),
flow_value, timestamp, number_of_short_channels, amt_to_rebalance)
).decode('ASCII')


Expand Down Expand Up @@ -138,7 +155,7 @@ def get_flow_value(flow):


def get_amount(amt):
if type(amt) is not int or amt <= 0:
if type(amt) is not int or amt == 0:
return None
return amt

Expand Down Expand Up @@ -234,6 +251,8 @@ def handle_query_foaf_balances(flow_value, amt_to_rebalance, plugin):
elif flow_value == b'\x01':
plugin.log("compute channels on which I want to forward {} satoshis while rebalancing".format(
amt_to_rebalance))
else:
return []

_, channels = get_funds(plugin)

Expand All @@ -257,8 +276,8 @@ def handle_query_foaf_balances(flow_value, amt_to_rebalance, plugin):
return channel_ids


def send_reply_foaf_balances(peer, amt, channels, plugin):
encode_reply_foaf_balances(channels, amt, plugin)
def send_reply_foaf_balances(peer, amt, flow, channels, plugin):
encode_reply_foaf_balances(channels, flow, amt, plugin)

# TODO: CHECK if 107b is the correct little endian of 439
res = plugin.rpc.dev_sendcustommsg(peer, "107b123412341234")
Expand Down Expand Up @@ -298,7 +317,7 @@ def on_custommsg(peer_id, message, plugin, **kwargs):

if chain_hash == BTC_CHAIN_HASH:
result = handle_query_foaf_balances(flow, amt, plugin)
r = send_reply_foaf_balances(peer_id, amt, result, plugin)
r = send_reply_foaf_balances(peer_id, amt, flow, result, plugin)
return_value = {"result": r}
else:
plugin.log("not handling non bitcoin chains for now")
Expand Down