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plugins/pay: retry when routehint fails.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-01-15 20:34:07 +10:30
committed by Christian Decker
parent e3f893444d
commit b17c344b71
2 changed files with 109 additions and 18 deletions
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65
plugins/pay.c
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@@ -52,6 +52,23 @@ struct pay_command {
static struct command_result *start_pay_attempt(struct command *cmd,
struct pay_command *pc);
/* Is this (erring) channel within the routehint itself? */
static bool channel_in_routehint(const struct route_info *routehint,
const char *buf, const jsmntok_t *scidtok)
{
struct short_channel_id scid;
if (!json_to_short_channel_id(buf, scidtok, &scid))
plugin_err("bad erring_channel '%.*s'",
scidtok->end - scidtok->start, buf + scidtok->start);
for (size_t i = 0; i < tal_count(routehint); i++)
if (short_channel_id_eq(&scid, &routehint[i].short_channel_id))
return true;
return false;
}
static struct command_result *waitsendpay_expired(struct command *cmd,
struct pay_command *pc)
{
@@ -99,15 +116,22 @@ static struct command_result *waitsendpay_error(struct command *cmd,
plugin_err("waitsendpay error no erring_direction '%.*s'",
error->end - error->start, buf + error->start);
/* Add erring channel to exclusion list. */
tal_arr_expand(&pc->excludes, tal_fmt(pc->excludes, "%.*s/%c",
scidtok->end - scidtok->start,
buf + scidtok->start,
buf[dirtok->start]));
attempt = &pc->attempts[tal_count(pc->attempts)-1];
attempt->failure = json_strdup(pc->attempts, buf, error);
/* If failure is in routehint part, eliminate that */
if (tal_count(pc->routehints) != 0
&& channel_in_routehint(pc->routehints[0], buf, scidtok)) {
tal_arr_remove(&pc->routehints, 0);
} else {
/* Otherwise, add erring channel to exclusion list. */
tal_arr_expand(&pc->excludes,
tal_fmt(pc->excludes, "%.*s/%c",
scidtok->end - scidtok->start,
buf + scidtok->start,
buf[dirtok->start]));
}
if (time_after(time_now(), pc->stoptime)) {
return waitsendpay_expired(cmd, pc);
}
@@ -194,6 +218,14 @@ static const char *join_routehint(const tal_t *ctx,
return ret;
}
/* Try again with the next routehint (or none if that was the last) */
static struct command_result *next_routehint(struct command *cmd,
struct pay_command *pc)
{
tal_arr_remove(&pc->routehints, 0);
return start_pay_attempt(cmd, pc);
}
static struct command_result *getroute_done(struct command *cmd,
const char *buf,
const jsmntok_t *result,
@@ -226,12 +258,18 @@ static struct command_result *getroute_done(struct command *cmd,
feepercent = ((double)fee) * 100.0 / ((double) pc->msatoshi);
if (fee > pc->exemptfee && feepercent > pc->maxfeepercent) {
if (tal_count(pc->routehints) != 0)
return next_routehint(cmd, pc);
return command_fail(cmd, PAY_ROUTE_TOO_EXPENSIVE,
"Route wanted fee of %"PRIu64" msatoshis",
fee);
}
if (delay > pc->maxdelay) {
if (tal_count(pc->routehints) != 0)
return next_routehint(cmd, pc);
return command_fail(cmd, PAY_ROUTE_TOO_EXPENSIVE,
"Route wanted delay of %u blocks", delay);
}
@@ -253,6 +291,19 @@ static struct command_result *getroute_done(struct command *cmd,
attempt.route,
pc->payment_hash,
json_desc);
}
static struct command_result *getroute_error(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct pay_command *pc)
{
/* If we were trying to use a routehint, remove and try again. */
if (tal_count(pc->routehints) != 0)
return next_routehint(cmd, pc);
return forward_error(cmd, buf, result, pc);
}
static struct command_result *start_pay_attempt(struct command *cmd,
@@ -294,7 +345,7 @@ static struct command_result *start_pay_attempt(struct command *cmd,
}
/* OK, ask for route to destination */
return send_outreq(cmd, "getroute", getroute_done, forward_error, pc,
return send_outreq(cmd, "getroute", getroute_done, getroute_error, pc,
"'id': '%s',"
"'msatoshi': %"PRIu64","
"'cltv': %u,"