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bitcoind: fee estimation support.

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This can be used for proper support for fee negotiation; for the moment
it will be used for our anchor transaction creation.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-04-12 13:07:03 +09:30
parent 51de503096
commit e84bf16bf8
2 changed files with 61 additions and 0 deletions
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48
daemon/bitcoind.c
View File

@ -361,6 +361,54 @@ void bitcoind_txid_lookup_(struct lightningd_state *dstate,
"gettransaction", lookup->txidhex, NULL);
}
static void process_estimatefee(struct bitcoin_cli *bcli)
{
double fee;
char *p, *end;
u64 fee_rate;
void (*cb)(struct lightningd_state *, u64, void *) = bcli->cb;
if (!bcli->output)
fatal("%s %s %s failed",
bcli->args[0], bcli->args[2], bcli->args[3]);
p = tal_strndup(bcli, bcli->output, bcli->output_bytes);
fee = strtod(p, &end);
if (end == p || *end != '\n')
fatal("%s %s %s gave non-numeric fee %s",
bcli->args[0], bcli->args[2], bcli->args[3], p);
/* Don't know at 2? Try 6... */
if (fee < 0) {
if (streq(bcli->args[3], "2")) {
start_bitcoin_cli(bcli->dstate, process_estimatefee,
bcli->cb, bcli->cb_arg,
"estimatefee", "6", NULL);
return;
}
log_unusual(bcli->dstate->base_log,
"Unable to estimate fee, using %"PRIu64,
bcli->dstate->config.closing_fee_rate);
fee_rate = bcli->dstate->config.closing_fee_rate;
} else {
/* If we used 6 as an estimate, double it. */
if (streq(bcli->args[3], "6"))
fee *= 2;
fee_rate = fee * 100000000;
}
cb(bcli->dstate, fee_rate, bcli->cb_arg);
}
void bitcoind_estimate_fee_(struct lightningd_state *dstate,
void (*cb)(struct lightningd_state *dstate,
u64, void *),
void *arg)
{
start_bitcoin_cli(dstate, process_estimatefee, cb, arg,
"estimatefee", "2", NULL);
}
static void process_sendrawrx(struct bitcoin_cli *bcli)
{
struct sha256_double txid;

13
daemon/bitcoind.h
View File

@ -37,6 +37,19 @@ void bitcoind_txid_lookup_(struct lightningd_state *dstate,
const struct bitcoin_tx *), \
(arg))
void bitcoind_estimate_fee_(struct lightningd_state *dstate,
void (*cb)(struct lightningd_state *dstate,
u64, void *),
void *arg);
#define bitcoind_estimate_fee(dstate, cb, arg) \
bitcoind_estimate_fee_((dstate), \
typesafe_cb_preargs(void, void *, \
(cb), (arg), \
struct lightningd_state *, \
u64), \
(arg))
void bitcoind_send_tx(struct lightningd_state *dstate,
const struct bitcoin_tx *tx);