aljaz/lightning
1
0
Fork 0
mirror of https://github.com/aljazceru/lightning.git synced 2025-12-24 01:24:26 +01:00
Code Issues Packages Projects Releases Wiki Activity

paymod: Add a local_channel_hints modifier to collect local channels

Browse Source 
We can have quite detailed information about our local channels, so call
`listpeers` before the `getroute` call on the root payment, to seed that
information in the channel_hints.
This commit is contained in:
Christian Decker
2020-05-22 17:20:36 +02:00
parent b1e9f4923b
commit 5e3134083e
3 changed files with 85 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
plugins/libplugin-pay.c
View File

@@ -54,6 +54,7 @@ struct payment *payment_new(tal_t *ctx, struct command *cmd,
p->partid = 0;
p->next_partid = 1;
p->plugin = cmd->plugin;
p->channel_hints = tal_arr(p, struct channel_hint, 0);
}
/* Initialize all modifier data so we can point to the fields when
@@ -793,3 +794,61 @@ static inline void retry_step_cb(struct retry_mod_data *rd,
payment_continue(p);
}
static struct command_result *
local_channel_hints_listpeers(struct command *cmd, const char *buffer,
const jsmntok_t *toks, struct payment *p)
{
const jsmntok_t *peers, *peer, *channels, *channel, *spendsats, *scid, *dir, *connected;
size_t i, j;
peers = json_get_member(buffer, toks, "peers");
if (peers == NULL)
goto done;
/* cppcheck-suppress uninitvar - cppcheck can't undestand these macros. */
json_for_each_arr(i, peer, peers) {
channels = json_get_member(buffer, peer, "channels");
if (channels == NULL)
continue;
connected = json_get_member(buffer, peer, "connected");
json_for_each_arr(j, channel, channels) {
struct channel_hint h;
spendsats = json_get_member(buffer, channel, "spendable_msat");
scid = json_get_member(buffer, channel, "short_channel_id");
dir = json_get_member(buffer, channel, "direction");
assert(spendsats != NULL && scid != NULL && dir != NULL);
json_to_bool(buffer, connected, &h.enabled);
json_to_short_channel_id(buffer, scid, &h.scid.scid);
json_to_int(buffer, dir, &h.scid.dir);
json_to_msat(buffer, spendsats, &h.estimated_capacity);
tal_arr_expand(&p->channel_hints, h);
}
}
done:
payment_continue(p);
return command_still_pending(cmd);
}
static void local_channel_hints_cb(void *d UNUSED, struct payment *p)
{
struct out_req *req;
/* If we are not the root we don't look up the channel balances since
* it is unlikely that the capacities have changed much since the root
* payment looked at them. We also only call `listpeers` when the
* payment is in state PAYMENT_STEP_INITIALIZED, right before calling
* `getroute`. */
if (p->parent != NULL || p->step != PAYMENT_STEP_INITIALIZED)
return payment_continue(p);
req = jsonrpc_request_start(p->plugin, NULL, "listpeers",
local_channel_hints_listpeers,
local_channel_hints_listpeers, p);
send_outreq(p->plugin, req);
}
REGISTER_PAYMENT_MODIFIER(local_channel_hints, void *, NULL, local_channel_hints_cb);