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pay: Save and recover failure information.

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Needed for particular race condition: client calls `sendpay` with
intent to call `waitsendpay` later to get information, but the
payment fails after `sendpay` returns but before client can invoke
`waitsendpay`.
This lets client know of information even if it manages to invoke
`waitsendpay` "late".
This commit is contained in:
ZmnSCPxj 2018-03-07 16:10:08 +00:00 committed by Rusty Russell
parent 693c718160
commit 411c9583a7
1 changed files with 49 additions and 6 deletions
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55
lightningd/pay.c
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@ -448,16 +448,27 @@ void payment_failed(struct lightningd *ld, const struct htlc_out *hout,
}
}
/* Save to DB */
/* This may invalidated the payment structure returned, so
* access to payment object should not be done after the
* below call. */
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
PAYMENT_FAILED, NULL);
wallet_payment_set_failinfo(ld->wallet,
&hout->payment_hash,
fail ? NULL : hout->failuremsg,
(fail && !retry_plausible),
fail ? fail->erring_index : -1,
fail ? fail->failcode : 0,
fail ? &fail->erring_node : NULL,
fail ? &fail->erring_channel : NULL,
fail ? fail->channel_update : NULL);
/* Report to gossipd if we decided we should. */
if (report_to_gossipd)
report_routing_failure(ld->log, ld->gossip, fail);
/* Report to client. */
sendpay_route_failure(ld, &hout->payment_hash,
retry_plausible, fail, hout->failuremsg,
@ -480,6 +491,14 @@ bool wait_payment(const tal_t *cxt,
struct sendpay_result *result;
char const *details;
bool cb_not_called;
u8 *failonionreply;
bool faildestperm;
int failindex;
enum onion_type failcode;
struct pubkey *failnode;
struct short_channel_id *failchannel;
u8 *failupdate;
struct routing_failure *fail;
payment = wallet_payment_by_hash(tmpctx, ld->wallet, payment_hash);
if (!payment) {
@ -509,12 +528,36 @@ bool wait_payment(const tal_t *cxt,
goto end;
case PAYMENT_FAILED:
/* FIXME: store the failure and other failure data
* on the DB so that we can do something other than
* unspecified-error. */
result = sendpay_result_simple_fail(tmpctx,
PAY_UNSPECIFIED_ERROR,
"Payment already failed");
/* Get error from DB */
wallet_payment_get_failinfo(tmpctx, ld->wallet, payment_hash,
&failonionreply,
&faildestperm,
&failindex,
&failcode,
&failnode,
&failchannel,
&failupdate);
/* Old DB might not save failure information */
if (!failonionreply && !failnode)
result = sendpay_result_simple_fail(tmpctx,
PAY_UNSPECIFIED_ERROR,
"Payment failure reason unknown");
else if (failonionreply) {
/* failed to parse returned onion error */
result = sendpay_result_route_failure(tmpctx, true, NULL, failonionreply, "reply from remote");
} else {
/* Parsed onion error, get its details */
assert(failnode);
assert(failchannel);
fail = tal(tmpctx, struct routing_failure);
fail->erring_index = failindex;
fail->failcode = failcode;
fail->erring_node = *failnode;
fail->erring_channel = *failchannel;
fail->channel_update = failupdate;
result = sendpay_result_route_failure(tmpctx, !faildestperm, fail, NULL, "route failure");
}
cb(result, cbarg);
cb_not_called = false;
goto end;