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jsonrpc: Added awaitpayment method

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`awaitinvoice` can be used to wait on a specific invoice to be
completed. If the invoice was previously paid, then the command
returns immediately, otherwise it'll block until the invoice is
paid. This complements `waitinvoice` which uses a highwatermark and
waits for the next invoice. I found waitinvoice a bit hard to use
since it doesn't allow waiting for a specific invoice to be completed,
just the next in the insertion order.
This commit is contained in:
Christian Decker 2017-01-10 12:18:40 +01:00 • committed by Rusty Russell
parent ba83430b5f
commit 1a9bfe7be4
1 changed files with 49 additions and 0 deletions
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49
daemon/invoice.c
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@ -350,3 +350,52 @@ static const struct json_command waitinvoice_command = {
"Returns {label}, {rhash} and {msatoshi} on success. "
};
AUTODATA(json_command, &waitinvoice_command);
/* Wait for an incoming payment matching the `label` in the JSON
* command. This will either return immediately if the payment has
* already been received or it may add the `cmd` to the list of
* waiters, if the payment is still pending.
*/
static void json_awaitpayment(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct invoice *i;
jsmntok_t *labeltok;
const char *label = NULL;
struct invoice_waiter *w;
struct invoices *invs = cmd->dstate->invoices;
if (!json_get_params(buffer, params, "label", &labeltok, NULL)) {
command_fail(cmd, "Missing {label}");
return;
}
/* Search in paid invoices, if found return immediately */
label = tal_strndup(cmd, buffer + labeltok->start, labeltok->end - labeltok->start);
i = find_invoice_by_label(&invs->paid, label);
if (i) {
tell_waiter(cmd, i);
return;
}
/* No luck in paid ones? Now try the unpaid ones. */
i = find_invoice_by_label(&invs->unpaid, label);
if (!i) {
command_fail(cmd, "Label not found");
return;
}
/* There is an unpaid one matching, let's wait... */
w = tal(cmd, struct invoice_waiter);
w->cmd = cmd;
list_add_tail(&invs->invoice_waiters, &w->list);
}
static const struct json_command awaitpayment_command = {
"awaitpayment",
json_awaitpayment,
"Wait for an incoming payment matching the invoice with {label}",
"Returns {label}, {rhash} and {msatoshi} on success"
};
AUTODATA(json_command, &awaitpayment_command);