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plugins/pay: exclude local channels with insufficient current capacity.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-01-15 14:48:27 +10:30
committed by Christian Decker
parent 139604a618
commit c6fa993203
1 changed files with 58 additions and 1 deletions
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59
plugins/pay.c
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@@ -164,6 +164,61 @@ static struct command_result *start_pay_attempt(struct command *cmd,
pc->dest, pc->msatoshi, pc->riskfactor, exclude);
}
/* gossipd doesn't know much about the current state of channels; here we
* manually exclude peers which are disconnected and channels which lack
* current capacity (it will eliminate those without total capacity). */
static struct command_result *listpeers_done(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct pay_command *pc)
{
const jsmntok_t *peer, *peers_end;
peer = json_get_member(buf, result, "peers");
if (!peer)
plugin_err("listpeers gave no 'peers'? '%.*s'",
result->end - result->start, buf);
peers_end = json_next(peer);
for (peer = peer + 1; peer < peers_end; peer = json_next(peer)) {
const jsmntok_t *chan, *chans_end;
bool connected;
json_to_bool(buf, json_get_member(buf, peer, "connected"),
&connected);
chan = json_get_member(buf, peer, "channels");
chans_end = json_next(chan);
for (chan = chan + 1; chan < chans_end; chan = json_next(chan)) {
const jsmntok_t *state, *spendable, *scid, *dir;
u64 capacity;
/* gossipd will only consider things in state NORMAL
* anyway; we don't need to exclude others. */
state = json_get_member(buf, chan, "state");
if (!json_tok_streq(buf, state, "CHANNELD_NORMAL"))
continue;
spendable = json_get_member(buf, chan,
"spendable_msatoshi");
json_to_u64(buf, spendable, &capacity);
if (connected && capacity >= pc->msatoshi)
continue;
/* Exclude this disconnected or low-capacity channel */
scid = json_get_member(buf, chan, "short_channel_id");
dir = json_get_member(buf, chan, "direction");
tal_arr_expand(&pc->excludes,
tal_fmt(pc->excludes, "%.*s/%c",
scid->end - scid->start,
buf + scid->start,
buf[dir->start]));
}
}
return start_pay_attempt(cmd, pc);
}
static struct command_result *handle_pay(struct command *cmd,
const char *buf,
const jsmntok_t *params)
@@ -229,7 +284,9 @@ static struct command_result *handle_pay(struct command *cmd,
pc->attempts = tal_arr(cmd, struct pay_attempt, 0);
pc->excludes = tal_arr(cmd, const char *, 0);
return start_pay_attempt(cmd, pc);
/* Get capacities of local channels. */
return send_outreq(cmd, "listpeers", listpeers_done, forward_error, pc,
" ");
}
static const struct plugin_command commands[] = { {