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rgb-cln/lightningd/chaintopology.c

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#include "config.h"
#include <bitcoin/feerate.h>
#include <bitcoin/script.h>
#include <bitcoin/tx.h>
#include <ccan/array_size/array_size.h>
#include <ccan/io/io.h>
#include <ccan/tal/str/str.h>
#include <common/configdir.h>
#include <common/htlc_tx.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/timeout.h>
#include <common/trace.h>
#include <common/type_to_string.h>
#include <db/exec.h>
#include <lightningd/bitcoind.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel.h>
#include <lightningd/coin_mvts.h>
#include <lightningd/gossip_control.h>
#include <lightningd/io_loop_with_timers.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/notification.h>
#include <math.h>
#include <wallet/txfilter.h>
/* Mutual recursion via timer. */
static void try_extend_tip(struct chain_topology *topo);
static bool first_update_complete = false;
/* init_topo sets topo->root, start_fee_estimate clears
* feerate_uninitialized (even if unsuccessful) */
static void maybe_completed_init(struct chain_topology *topo)
{
if (topo->feerate_uninitialized)
return;
if (!topo->root)
return;
log_debug(topo->ld->log, "io_break: %s", __func__);
io_break(topo);
}
static void next_topology_timer(struct chain_topology *topo)
{
assert(!topo->extend_timer);
topo->extend_timer = new_reltimer(topo->ld->timers, topo,
time_from_sec(topo->poll_seconds),
try_extend_tip, topo);
}
static bool we_broadcast(const struct chain_topology *topo,
const struct bitcoin_txid *txid)
{
return outgoing_tx_map_get(topo->outgoing_txs, txid) != NULL;
}
static void filter_block_txs(struct chain_topology *topo, struct block *b)
{
size_t i;
struct amount_sat owned;
/* Now we see if any of those txs are interesting. */
for (i = 0; i < tal_count(b->full_txs); i++) {
const struct bitcoin_tx *tx = b->full_txs[i];
struct bitcoin_txid txid;
size_t j;
bool is_coinbase = i == 0;
/* Tell them if it spends a txo we care about. */
for (j = 0; j < tx->wtx->num_inputs; j++) {
struct bitcoin_outpoint out;
struct txowatch *txo;
bitcoin_tx_input_get_txid(tx, j, &out.txid);
out.n = tx->wtx->inputs[j].index;
txo = txowatch_hash_get(topo->txowatches, &out);
if (txo) {
wallet_transaction_add(topo->ld->wallet,
tx->wtx, b->height, i);
txowatch_fire(txo, tx, j, b);
}
}
owned = AMOUNT_SAT(0);
txid = b->txids[i];
if (txfilter_match(topo->bitcoind->ld->owned_txfilter, tx)) {
wallet_extract_owned_outputs(topo->bitcoind->ld->wallet,
tx->wtx, is_coinbase, &b->height, &owned);
wallet_transaction_add(topo->ld->wallet, tx->wtx,
b->height, i);
}
/* We did spends first, in case that tells us to watch tx. */
if (watching_txid(topo, &txid) || we_broadcast(topo, &txid)) {
wallet_transaction_add(topo->ld->wallet,
tx->wtx, b->height, i);
}
txwatch_inform(topo, &txid, tx);
}
b->full_txs = tal_free(b->full_txs);
b->txids = tal_free(b->txids);
}
size_t get_tx_depth(const struct chain_topology *topo,
const struct bitcoin_txid *txid)
{
u32 blockheight = wallet_transaction_height(topo->ld->wallet, txid);
if (blockheight == 0)
return 0;
return topo->tip->height - blockheight + 1;
}
struct txs_to_broadcast {
/* We just sent txs[cursor] */
size_t cursor;
/* These are hex encoded already, for bitcoind_sendrawtx */
const char **txs;
/* IDs to attach to each tx (could be NULL!) */
const char **cmd_id;
/* allowhighfees flags for each tx */
bool *allowhighfees;
};
/* We just sent the last entry in txs[]. Shrink and send the next last. */
static void broadcast_remainder(struct bitcoind *bitcoind,
bool success, const char *msg,
struct txs_to_broadcast *txs)
{
if (!success)
log_debug(bitcoind->log,
"Expected error broadcasting tx %s: %s",
txs->txs[txs->cursor], msg);
txs->cursor++;
if (txs->cursor == tal_count(txs->txs)) {
tal_free(txs);
return;
}
/* Broadcast next one. */
bitcoind_sendrawtx(bitcoind,
txs->cmd_id[txs->cursor], txs->txs[txs->cursor],
txs->allowhighfees[txs->cursor],
broadcast_remainder, txs);
}
/* FIXME: This is dumb. We can group txs and avoid bothering bitcoind
* if any one tx is in the main chain. */
static void rebroadcast_txs(struct chain_topology *topo)
{
/* Copy txs now (peers may go away, and they own txs). */
struct txs_to_broadcast *txs;
struct outgoing_tx *otx;
struct outgoing_tx_map_iter it;
tal_t *cleanup_ctx = tal(NULL, char);
txs = tal(topo, struct txs_to_broadcast);
txs->cmd_id = tal_arr(txs, const char *, 0);
/* Put any txs we want to broadcast in ->txs. */
txs->txs = tal_arr(txs, const char *, 0);
txs->allowhighfees = tal_arr(txs, bool, 0);
for (otx = outgoing_tx_map_first(topo->outgoing_txs, &it); otx;
otx = outgoing_tx_map_next(topo->outgoing_txs, &it)) {
if (wallet_transaction_height(topo->ld->wallet, &otx->txid))
continue;
/* Don't send ones which aren't ready yet. Note that if the
* minimum block is N, we broadcast it when we have block N-1! */
if (get_block_height(topo) + 1 < otx->minblock)
continue;
/* Don't free from txmap inside loop! */
if (otx->refresh
&& !otx->refresh(otx->channel, &otx->tx, otx->cbarg)) {
tal_steal(cleanup_ctx, otx);
continue;
}
tal_arr_expand(&txs->txs, fmt_bitcoin_tx(txs->txs, otx->tx));
tal_arr_expand(&txs->allowhighfees, otx->allowhighfees);
tal_arr_expand(&txs->cmd_id, tal_strdup_or_null(txs, otx->cmd_id));
}
tal_free(cleanup_ctx);
/* Free explicitly in case we were called because a block came in.
* Then set a new timer 30-60 seconds away */
tal_free(topo->rebroadcast_timer);
topo->rebroadcast_timer = new_reltimer(topo->ld->timers, topo,
time_from_sec(30 + pseudorand(30)),
rebroadcast_txs, topo);
/* Let this do the dirty work. */
txs->cursor = (size_t)-1;
broadcast_remainder(topo->bitcoind, true, "", txs);
}
static void destroy_outgoing_tx(struct outgoing_tx *otx, struct chain_topology *topo)
{
outgoing_tx_map_del(topo->outgoing_txs, otx);
}
static void clear_otx_channel(struct channel *channel, struct outgoing_tx *otx)
{
if (otx->channel != channel)
fatal("channel %p, otx %p has channel %p", channel, otx, otx->channel);
otx->channel = NULL;
}
static void broadcast_done(struct bitcoind *bitcoind,
bool success, const char *msg,
struct outgoing_tx *otx)
{
/* Channel gone? Stop. */
if (!otx->channel) {
tal_free(otx);
return;
}
/* No longer needs to be disconnected if channel dies. */
tal_del_destructor2(otx->channel, clear_otx_channel, otx);
if (otx->finished) {
if (otx->finished(otx->channel, otx->tx, success, msg, otx->cbarg)) {
tal_free(otx);
return;
}
}
if (we_broadcast(bitcoind->ld->topology, &otx->txid)) {
log_debug(
bitcoind->ld->topology->log,
"Not adding %s to list of outgoing transactions, already "
"present",
type_to_string(tmpctx, struct bitcoin_txid, &otx->txid));
tal_free(otx);
return;
}
/* For continual rebroadcasting, until channel freed. */
tal_steal(otx->channel, otx);
outgoing_tx_map_add(bitcoind->ld->topology->outgoing_txs, otx);
tal_add_destructor2(otx, destroy_outgoing_tx, bitcoind->ld->topology);
}
void broadcast_tx_(struct chain_topology *topo,
struct channel *channel, const struct bitcoin_tx *tx,
const char *cmd_id, bool allowhighfees, u32 minblock,
bool (*finished)(struct channel *channel,
const struct bitcoin_tx *tx,
bool success,
const char *err,
void *cbarg),
bool (*refresh)(struct channel *channel,
const struct bitcoin_tx **tx,
void *cbarg),
void *cbarg)
{
/* Channel might vanish: topo owns it to start with. */
struct outgoing_tx *otx = tal(topo, struct outgoing_tx);
otx->channel = channel;
bitcoin_txid(tx, &otx->txid);
otx->tx = clone_bitcoin_tx(otx, tx);
otx->minblock = minblock;
otx->allowhighfees = allowhighfees;
otx->finished = finished;
otx->refresh = refresh;
otx->cbarg = cbarg;
if (taken(otx->cbarg))
tal_steal(otx, otx->cbarg);
otx->cmd_id = tal_strdup_or_null(otx, cmd_id);
/* Note that if the minimum block is N, we broadcast it when
* we have block N-1! */
if (get_block_height(topo) + 1 < otx->minblock) {
log_debug(topo->log, "Deferring broadcast of txid %s until block %u",
type_to_string(tmpctx, struct bitcoin_txid, &otx->txid),
otx->minblock - 1);
/* For continual rebroadcasting, until channel freed. */
tal_steal(otx->channel, otx);
outgoing_tx_map_add(topo->outgoing_txs, otx);
tal_add_destructor2(otx, destroy_outgoing_tx, topo);
return;
}
tal_add_destructor2(channel, clear_otx_channel, otx);
log_debug(topo->log, "Broadcasting txid %s%s%s",
type_to_string(tmpctx, struct bitcoin_txid, &otx->txid),
cmd_id ? " for " : "", cmd_id ? cmd_id : "");
wallet_transaction_add(topo->ld->wallet, tx->wtx, 0, 0);
bitcoind_sendrawtx(topo->bitcoind, otx->cmd_id,
fmt_bitcoin_tx(tmpctx, otx->tx),
allowhighfees,
broadcast_done, otx);
}
static enum watch_result closeinfo_txid_confirmed(struct lightningd *ld,
struct channel *channel,
const struct bitcoin_txid *txid,
const struct bitcoin_tx *tx,
unsigned int depth)
{
/* Sanity check. */
if (tx != NULL) {
struct bitcoin_txid txid2;
bitcoin_txid(tx, &txid2);
if (!bitcoin_txid_eq(txid, &txid2)) {
channel_internal_error(channel, "Txid for %s is not %s",
type_to_string(tmpctx,
struct bitcoin_tx,
tx),
type_to_string(tmpctx,
struct bitcoin_txid,
txid));
return DELETE_WATCH;
}
}
/* We delete ourselves first time, so should not be reorged out!! */
assert(depth > 0);
/* Subtle: depth 1 == current block. */
wallet_confirm_tx(ld->wallet, txid,
get_block_height(ld->topology) + 1 - depth);
return DELETE_WATCH;
}
/* We need to know if close_info UTXOs (which the wallet doesn't natively know
* how to spend, so is not in the normal path) get reconfirmed.
*
* This can happen on startup (where we manually unwind 100 blocks) or on a
* reorg. The db NULLs out the confirmation_height, so we can't easily figure
* out just the new ones (and removing the ON DELETE SET NULL clause is
* non-trivial).
*
* So every time, we just set a notification for every tx in this class we're
* not already watching: there are not usually many, nor many reorgs, so the
* redundancy is OK.
*/
static void watch_for_utxo_reconfirmation(struct chain_topology *topo,
struct wallet *wallet)
{
struct utxo **unconfirmed;
unconfirmed = wallet_get_unconfirmed_closeinfo_utxos(tmpctx, wallet);
for (size_t i = 0; i < tal_count(unconfirmed); i++) {
assert(unconfirmed[i]->close_info != NULL);
assert(unconfirmed[i]->blockheight == NULL);
if (find_txwatch(topo, &unconfirmed[i]->outpoint.txid, NULL))
continue;
watch_txid(topo, topo, NULL,
&unconfirmed[i]->outpoint.txid,
closeinfo_txid_confirmed);
}
}
/* Mutual recursion via timer. */
static void next_updatefee_timer(struct chain_topology *topo);
static u32 interp_feerate(const struct feerate_est *rates, u32 blockcount)
{
const struct feerate_est *before = NULL, *after = NULL;
/* Find before and after. */
for (size_t i = 0; i < tal_count(rates); i++) {
if (rates[i].blockcount <= blockcount) {
before = &rates[i];
} else if (rates[i].blockcount > blockcount && !after) {
after = &rates[i];
}
}
/* No estimates at all? */
if (!before && !after)
return 0;
/* We don't extrapolate. */
if (!before && after)
return after->rate;
if (before && !after)
return before->rate;
/* Interpolate, eg. blockcount 10, rate 15000, blockcount 20, rate 5000.
* At 15, rate should be 10000.
* 15000 + (15 - 10) / (20 - 10) * (15000 - 5000)
* 15000 + 5 / 10 * 10000
* => 10000
*/
/* Don't go backwards though! */
if (before->rate < after->rate)
return before->rate;
return before->rate
- ((u64)(blockcount - before->blockcount)
* (before->rate - after->rate)
/ (after->blockcount - before->blockcount));
}
u32 feerate_for_deadline(const struct chain_topology *topo, u32 blockcount)
{
u32 rate = interp_feerate(topo->feerates[0], blockcount);
/* 0 is a special value, meaning "don't know" */
if (rate && rate < topo->feerate_floor)
rate = topo->feerate_floor;
return rate;
}
u32 smoothed_feerate_for_deadline(const struct chain_topology *topo,
u32 blockcount)
{
/* Note: we cap it at feerate_floor when we smooth */
return interp_feerate(topo->smoothed_feerates, blockcount);
}
/* feerate_for_deadline, but really lowball for distant targets */
u32 feerate_for_target(const struct chain_topology *topo, u64 deadline)
{
u64 blocks, blockheight;
blockheight = get_block_height(topo);
/* Past deadline? Want it now. */
if (blockheight > deadline)
return feerate_for_deadline(topo, 1);
blocks = deadline - blockheight;
/* Over 200 blocks, we *always* use min fee! */
if (blocks > 200)
return FEERATE_FLOOR;
/* Over 100 blocks, use min fee bitcoind will accept */
if (blocks > 100)
return get_feerate_floor(topo);
return feerate_for_deadline(topo, blocks);
}
/* Mixes in fresh feerate rate into old smoothed values, modifies rate */
static void smooth_one_feerate(const struct chain_topology *topo,
struct feerate_est *rate)
{
/* Smoothing factor alpha for simple exponential smoothing. The goal is to
* have the feerate account for 90 percent of the values polled in the last
* 2 minutes. The following will do that in a polling interval
* independent manner. */
double alpha = 1 - pow(0.1,(double)topo->poll_seconds / 120);
u32 old_feerate, feerate_smooth;
/* We don't call this unless we had a previous feerate */
old_feerate = smoothed_feerate_for_deadline(topo, rate->blockcount);
assert(old_feerate);
feerate_smooth = rate->rate * alpha + old_feerate * (1 - alpha);
/* But to avoid updating forever, only apply smoothing when its
* effect is more then 10 percent */
if (abs((int)rate->rate - (int)feerate_smooth) > (0.1 * rate->rate))
rate->rate = feerate_smooth;
if (rate->rate < get_feerate_floor(topo))
rate->rate = get_feerate_floor(topo);
if (rate->rate != feerate_smooth)
log_debug(topo->log,
"Feerate estimate for %u blocks set to %u (was %u)",
rate->blockcount, rate->rate, feerate_smooth);
}
static bool feerates_differ(const struct feerate_est *a,
const struct feerate_est *b)
{
if (tal_count(a) != tal_count(b))
return true;
for (size_t i = 0; i < tal_count(a); i++) {
if (a[i].blockcount != b[i].blockcount)
return true;
if (a[i].rate != b[i].rate)
return true;
}
return false;
}
/* In case the plugin does weird stuff! */
static bool different_blockcounts(struct chain_topology *topo,
const struct feerate_est *old,
const struct feerate_est *new)
{
if (tal_count(old) != tal_count(new)) {
log_unusual(topo->log, "Presented with %zu feerates this time (was %zu!)",
tal_count(new), tal_count(old));
return true;
}
for (size_t i = 0; i < tal_count(old); i++) {
if (old[i].blockcount != new[i].blockcount) {
log_unusual(topo->log, "Presented with feerates"
" for blockcount %u, previously %u",
new[i].blockcount, old[i].blockcount);
return true;
}
}
return false;
}
static void update_feerates(struct lightningd *ld,
u32 feerate_floor,
const struct feerate_est *rates TAKES)
{
struct feerate_est *new_smoothed;
bool changed;
struct chain_topology *topo = ld->topology;
topo->feerate_floor = feerate_floor;
/* Don't bother updating if we got no feerates; we'd rather have
* historical ones, if any. */
if (tal_count(rates) == 0)
goto rearm;
/* If the feerate blockcounts differ, don't average, just override */
if (topo->feerates[0] && different_blockcounts(topo, topo->feerates[0], rates)) {
for (size_t i = 0; i < ARRAY_SIZE(topo->feerates); i++)
topo->feerates[i] = tal_free(topo->feerates[i]);
topo->smoothed_feerates = tal_free(topo->smoothed_feerates);
}
/* Move down historical rates, insert these */
tal_free(topo->feerates[FEE_HISTORY_NUM-1]);
memmove(topo->feerates + 1, topo->feerates,
sizeof(topo->feerates[0]) * (FEE_HISTORY_NUM-1));
topo->feerates[0] = tal_dup_talarr(topo, struct feerate_est, rates);
changed = feerates_differ(topo->feerates[0], topo->feerates[1]);
/* Use this as basis of new smoothed ones. */
new_smoothed = tal_dup_talarr(topo, struct feerate_est, topo->feerates[0]);
/* If there were old smoothed feerates, incorporate those */
if (tal_count(topo->smoothed_feerates) != 0) {
for (size_t i = 0; i < tal_count(new_smoothed); i++)
smooth_one_feerate(topo, &new_smoothed[i]);
}
changed |= feerates_differ(topo->smoothed_feerates, new_smoothed);
tal_free(topo->smoothed_feerates);
topo->smoothed_feerates = new_smoothed;
if (changed)
notify_feerate_change(topo->ld);
rearm:
if (topo->feerate_uninitialized) {
/* This doesn't mean we *have* a fee estimate, but it does
* mean we tried. */
topo->feerate_uninitialized = false;
maybe_completed_init(topo);
}
next_updatefee_timer(topo);
}
static void start_fee_estimate(struct chain_topology *topo)
{
topo->updatefee_timer = NULL;
if (topo->stopping)
return;
/* Once per new block head, update fee estimates. */
bitcoind_estimate_fees(topo->bitcoind, update_feerates);
}
struct rate_conversion {
u32 blockcount;
};
static struct rate_conversion conversions[] = {
[FEERATE_OPENING] = { 12 },
[FEERATE_MUTUAL_CLOSE] = { 100 },
[FEERATE_UNILATERAL_CLOSE] = { 6 },
[FEERATE_DELAYED_TO_US] = { 12 },
[FEERATE_HTLC_RESOLUTION] = { 6 },
[FEERATE_PENALTY] = { 12 },
};
u32 opening_feerate(struct chain_topology *topo)
{
if (topo->ld->force_feerates)
return topo->ld->force_feerates[FEERATE_OPENING];
return feerate_for_deadline(topo,
conversions[FEERATE_OPENING].blockcount);
}
u32 mutual_close_feerate(struct chain_topology *topo)
{
if (topo->ld->force_feerates)
return topo->ld->force_feerates[FEERATE_MUTUAL_CLOSE];
return smoothed_feerate_for_deadline(topo,
conversions[FEERATE_MUTUAL_CLOSE].blockcount);
}
u32 unilateral_feerate(struct chain_topology *topo, bool option_anchors)
{
if (topo->ld->force_feerates)
return topo->ld->force_feerates[FEERATE_UNILATERAL_CLOSE];
if (option_anchors) {
/* We can lowball fee, since we can CPFP with anchors */
u32 feerate = feerate_for_deadline(topo, 100);
if (!feerate)
return 0; /* Don't know */
/* We still need to get into the mempool, so use 5 sat/byte */
if (feerate < 1250)
return 1250;
return feerate;
}
return smoothed_feerate_for_deadline(topo,
conversions[FEERATE_UNILATERAL_CLOSE].blockcount)
* topo->ld->config.commit_fee_percent / 100;
}
u32 delayed_to_us_feerate(struct chain_topology *topo)
{
if (topo->ld->force_feerates)
return topo->ld->force_feerates[FEERATE_DELAYED_TO_US];
return smoothed_feerate_for_deadline(topo,
conversions[FEERATE_DELAYED_TO_US].blockcount);
}
u32 htlc_resolution_feerate(struct chain_topology *topo)
{
if (topo->ld->force_feerates)
return topo->ld->force_feerates[FEERATE_HTLC_RESOLUTION];
return smoothed_feerate_for_deadline(topo,
conversions[FEERATE_HTLC_RESOLUTION].blockcount);
}
u32 penalty_feerate(struct chain_topology *topo)
{
if (topo->ld->force_feerates)
return topo->ld->force_feerates[FEERATE_PENALTY];
return smoothed_feerate_for_deadline(topo,
conversions[FEERATE_PENALTY].blockcount);
}
u32 get_feerate_floor(const struct chain_topology *topo)
{
return topo->feerate_floor;
}
static struct command_result *json_feerates(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct chain_topology *topo = cmd->ld->topology;
struct json_stream *response;
bool missing;
enum feerate_style *style;
u32 rate;
if (!param(cmd, buffer, params,
p_req("style", param_feerate_style, &style),
NULL))
return command_param_failed();
missing = (tal_count(topo->feerates[0]) == 0);
response = json_stream_success(cmd);
if (missing)
json_add_string(response, "warning_missing_feerates",
"Some fee estimates unavailable: bitcoind startup?");
json_object_start(response, feerate_style_name(*style));
rate = opening_feerate(topo);
if (rate)
json_add_num(response, "opening", feerate_to_style(rate, *style));
rate = mutual_close_feerate(topo);
if (rate)
json_add_num(response, "mutual_close",
feerate_to_style(rate, *style));
rate = unilateral_feerate(topo, false);
if (rate)
json_add_num(response, "unilateral_close",
feerate_to_style(rate, *style));
rate = unilateral_feerate(topo, true);
if (rate)
json_add_num(response, "unilateral_anchor_close",
feerate_to_style(rate, *style));
rate = penalty_feerate(topo);
if (rate)
json_add_num(response, "penalty",
feerate_to_style(rate, *style));
if (cmd->ld->deprecated_apis) {
rate = delayed_to_us_feerate(topo);
if (rate)
json_add_num(response, "delayed_to_us",
feerate_to_style(rate, *style));
rate = htlc_resolution_feerate(topo);
if (rate)
json_add_num(response, "htlc_resolution",
feerate_to_style(rate, *style));
}
json_add_u64(response, "min_acceptable",
feerate_to_style(feerate_min(cmd->ld, NULL), *style));
json_add_u64(response, "max_acceptable",
feerate_to_style(feerate_max(cmd->ld, NULL), *style));
json_add_u64(response, "floor",
feerate_to_style(get_feerate_floor(cmd->ld->topology),
*style));
json_array_start(response, "estimates");
assert(tal_count(topo->smoothed_feerates) == tal_count(topo->feerates[0]));
for (size_t i = 0; i < tal_count(topo->feerates[0]); i++) {
json_object_start(response, NULL);
json_add_num(response, "blockcount",
topo->feerates[0][i].blockcount);
json_add_u64(response, "feerate",
feerate_to_style(topo->feerates[0][i].rate, *style));
json_add_u64(response, "smoothed_feerate",
feerate_to_style(topo->smoothed_feerates[i].rate,
*style));
json_object_end(response);
}
json_array_end(response);
json_object_end(response);
if (!missing) {
/* It actually is negotiated per-channel... */
bool anchor_outputs
= feature_offered(cmd->ld->our_features->bits[INIT_FEATURE],
OPT_ANCHOR_OUTPUTS)
|| feature_offered(cmd->ld->our_features->bits[INIT_FEATURE],
OPT_ANCHORS_ZERO_FEE_HTLC_TX);
json_object_start(response, "onchain_fee_estimates");
/* eg 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 == weight 702 */
json_add_num(response, "opening_channel_satoshis",
opening_feerate(cmd->ld->topology) * 702 / 1000);
/* eg. 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 == weight 673 */
json_add_u64(response, "mutual_close_satoshis",
mutual_close_feerate(cmd->ld->topology) * 673 / 1000);
/* eg. 02000000000101c4fecaae1ea940c15ec502de732c4c386d51f981317605bbe5ad2c59165690ab00000000009db0e280010a2d0f00000000002200208d290003cedb0dd00cd5004c2d565d55fc70227bf5711186f4fa9392f8f32b4a0400483045022100952fcf8c730c91cf66bcb742cd52f046c0db3694dc461e7599be330a22466d790220740738a6f9d9e1ae5c86452fa07b0d8dddc90f8bee4ded24a88fe4b7400089eb01483045022100db3002a93390fc15c193da57d6ce1020e82705e760a3aa935ebe864bd66dd8e8022062ee9c6aa7b88ff4580e2671900a339754116371d8f40eba15b798136a76cd150147522102324266de8403b3ab157a09f1f784d587af61831c998c151bcc21bb74c2b2314b2102e3bd38009866c9da8ec4aa99cc4ea9c6c0dd46df15c61ef0ce1f271291714e5752ae9a3ed620 == weight 598 */
/* Or, with anchors:
* 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 1112 */
if (anchor_outputs)
json_add_u64(response, "unilateral_close_satoshis",
unilateral_feerate(cmd->ld->topology, true) * 1112 / 1000);
else
json_add_u64(response, "unilateral_close_satoshis",
unilateral_feerate(cmd->ld->topology, false) * 598 / 1000);
json_add_u64(response, "unilateral_close_nonanchor_satoshis",
unilateral_feerate(cmd->ld->topology, false) * 598 / 1000);
json_add_u64(response, "htlc_timeout_satoshis",
htlc_timeout_fee(htlc_resolution_feerate(cmd->ld->topology),
false, false).satoshis /* Raw: estimate */);
json_add_u64(response, "htlc_success_satoshis",
htlc_success_fee(htlc_resolution_feerate(cmd->ld->topology),
false, false).satoshis /* Raw: estimate */);
json_object_end(response);
}
return command_success(cmd, response);
}
static const struct json_command feerates_command = {
"feerates",
"bitcoin",
json_feerates,
"Return feerate estimates, either satoshi-per-kw ({style} perkw) or satoshi-per-kb ({style} perkb)."
};
AUTODATA(json_command, &feerates_command);
static struct command_result *json_parse_feerate(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct json_stream *response;
u32 *feerate;
if (!param(cmd, buffer, params,
p_req("feerate", param_feerate, &feerate),
NULL))
return command_param_failed();
response = json_stream_success(cmd);
json_add_num(response, feerate_style_name(FEERATE_PER_KSIPA),
feerate_to_style(*feerate, FEERATE_PER_KSIPA));
return command_success(cmd, response);
}
static const struct json_command parse_feerate_command = {
"parsefeerate",
"bitcoin",
json_parse_feerate,
"Return current feerate in perkw + perkb for given feerate string."
};
AUTODATA(json_command, &parse_feerate_command);
static void next_updatefee_timer(struct chain_topology *topo)
{
assert(!topo->updatefee_timer);
topo->updatefee_timer = new_reltimer(topo->ld->timers, topo,
time_from_sec(topo->poll_seconds),
start_fee_estimate, topo);
}
struct sync_waiter {
/* Linked from chain_topology->sync_waiters */
struct list_node list;
void (*cb)(struct chain_topology *topo, void *arg);
void *arg;
};
static void destroy_sync_waiter(struct sync_waiter *waiter)
{
list_del(&waiter->list);
}
void topology_add_sync_waiter_(const tal_t *ctx,
struct chain_topology *topo,
void (*cb)(struct chain_topology *topo,
void *arg),
void *arg)
{
struct sync_waiter *w = tal(ctx, struct sync_waiter);
w->cb = cb;
w->arg = arg;
list_add_tail(topo->sync_waiters, &w->list);
tal_add_destructor(w, destroy_sync_waiter);
}
/* Once we're run out of new blocks to add, call this. */
static void updates_complete(struct chain_topology *topo)
{
if (!bitcoin_blkid_eq(&topo->tip->blkid, &topo->prev_tip)) {
/* Tell watch code to re-evaluate all txs. */
watch_topology_changed(topo);
/* Tell lightningd about new block. */
notify_new_block(topo->bitcoind->ld, topo->tip->height);
/* Maybe need to rebroadcast. */
rebroadcast_txs(topo);
/* We've processed these UTXOs */
db_set_intvar(topo->bitcoind->ld->wallet->db,
"last_processed_block", topo->tip->height);
topo->prev_tip = topo->tip->blkid;
/* Send out an account balance snapshot */
if (!first_update_complete) {
send_account_balance_snapshot(topo->ld, topo->tip->height);
first_update_complete = true;
}
}
/* If bitcoind is synced, we're now synced. */
if (topo->bitcoind->synced && !topology_synced(topo)) {
struct sync_waiter *w;
struct list_head *list = topo->sync_waiters;
/* Mark topology_synced() before callbacks. */
topo->sync_waiters = NULL;
while ((w = list_pop(list, struct sync_waiter, list))) {
/* In case it doesn't free itself. */
tal_del_destructor(w, destroy_sync_waiter);
tal_steal(list, w);
w->cb(topo, w->arg);
}
tal_free(list);
}
/* Try again soon. */
next_topology_timer(topo);
}
static void record_wallet_spend(struct lightningd *ld,
struct bitcoin_outpoint *outpoint,
struct bitcoin_txid *txid,
u32 tx_blockheight)
{
struct utxo *utxo;
/* Find the amount this was for */
utxo = wallet_utxo_get(tmpctx, ld->wallet, outpoint);
if (!utxo) {
log_broken(ld->log, "No record of utxo %s",
type_to_string(tmpctx, struct bitcoin_outpoint,
outpoint));
return;
}
notify_chain_mvt(ld, new_coin_wallet_withdraw(tmpctx, txid, outpoint,
tx_blockheight,
utxo->amount, WITHDRAWAL));
}
/**
* topo_update_spends -- Tell the wallet about all spent outpoints
*/
static void topo_update_spends(struct chain_topology *topo, struct block *b)
{
const struct short_channel_id *spent_scids;
for (size_t i = 0; i < tal_count(b->full_txs); i++) {
const struct bitcoin_tx *tx = b->full_txs[i];
for (size_t j = 0; j < tx->wtx->num_inputs; j++) {
struct bitcoin_outpoint outpoint;
bitcoin_tx_input_get_outpoint(tx, j, &outpoint);
if (wallet_outpoint_spend(topo->ld->wallet, tmpctx,
b->height, &outpoint))
record_wallet_spend(topo->ld, &outpoint,
&b->txids[i], b->height);
}
}
/* Retrieve all potential channel closes from the UTXO set and
* tell gossipd about them. */
spent_scids =
wallet_utxoset_get_spent(tmpctx, topo->ld->wallet, b->height);
gossipd_notify_spends(topo->bitcoind->ld, b->height, spent_scids);
}
static void topo_add_utxos(struct chain_topology *topo, struct block *b)
{
for (size_t i = 0; i < tal_count(b->full_txs); i++) {
const struct bitcoin_tx *tx = b->full_txs[i];
struct bitcoin_outpoint outpoint;
bitcoin_txid(tx, &outpoint.txid);
for (outpoint.n = 0;
outpoint.n < tx->wtx->num_outputs;
outpoint.n++) {
if (tx->wtx->outputs[outpoint.n].features
& WALLY_TX_IS_COINBASE)
continue;
const u8 *script = bitcoin_tx_output_get_script(tmpctx, tx, outpoint.n);
struct amount_asset amt = bitcoin_tx_output_get_amount(tx, outpoint.n);
if (amount_asset_is_main(&amt) && is_p2wsh(script, NULL)) {
wallet_utxoset_add(topo->ld->wallet, &outpoint,
b->height, i, script,
amount_asset_to_sat(&amt));
}
}
}
}
static void add_tip(struct chain_topology *topo, struct block *b)
{
/* Attach to tip; b is now the tip. */
assert(b->height == topo->tip->height + 1);
b->prev = topo->tip;
topo->tip->next = b; /* FIXME this doesn't seem to be used anywhere */
topo->tip = b;
trace_span_start("wallet_block_add", b);
wallet_block_add(topo->ld->wallet, b);
trace_span_end(b);
trace_span_start("topo_add_utxo", b);
topo_add_utxos(topo, b);
trace_span_end(b);
trace_span_start("topo_update_spends", b);
topo_update_spends(topo, b);
trace_span_end(b);
/* Only keep the transactions we care about. */
trace_span_start("filter_block_txs", b);
filter_block_txs(topo, b);
trace_span_end(b);
block_map_add(topo->block_map, b);
topo->max_blockheight = b->height;
}
static struct block *new_block(struct chain_topology *topo,
struct bitcoin_block *blk,
unsigned int height)
{
struct block *b = tal(topo, struct block);
bitcoin_block_blkid(blk, &b->blkid);
log_debug(topo->log, "Adding block %u: %s",
height,
type_to_string(tmpctx, struct bitcoin_blkid, &b->blkid));
assert(!block_map_get(topo->block_map, &b->blkid));
b->next = NULL;
b->prev = NULL;
b->height = height;
b->hdr = blk->hdr;
b->full_txs = tal_steal(b, blk->tx);
b->txids = tal_steal(b, blk->txids);
return b;
}
static void remove_tip(struct chain_topology *topo)
{
struct block *b = topo->tip;
struct bitcoin_txid *txs;
size_t n;
const struct short_channel_id *removed_scids;
log_debug(topo->log, "Removing stale block %u: %s",
topo->tip->height,
type_to_string(tmpctx, struct bitcoin_blkid, &b->blkid));
/* Move tip back one. */
topo->tip = b->prev;
if (!topo->tip)
fatal("Initial block %u (%s) reorganized out!",
b->height,
type_to_string(tmpctx, struct bitcoin_blkid, &b->blkid));
txs = wallet_transactions_by_height(b, topo->ld->wallet, b->height);
n = tal_count(txs);
/* Notify that txs are kicked out (their height will be set NULL in db) */
for (size_t i = 0; i < n; i++)
txwatch_fire(topo, &txs[i], 0);
/* Grab these before we delete block from db */
removed_scids = wallet_utxoset_get_created(tmpctx, topo->ld->wallet,
b->height);
wallet_block_remove(topo->ld->wallet, b);
/* This may have unconfirmed txs: reconfirm as we add blocks. */
watch_for_utxo_reconfirmation(topo, topo->ld->wallet);
block_map_del(topo->block_map, b);
/* These no longer exist, so gossipd drops any reference to them just
* as if they were spent. */
gossipd_notify_spends(topo->bitcoind->ld, b->height, removed_scids);
tal_free(b);
}
static void get_new_block(struct bitcoind *bitcoind,
struct bitcoin_blkid *blkid,
struct bitcoin_block *blk,
struct chain_topology *topo)
{
if (!blkid && !blk) {
/* No such block, we're done. */
updates_complete(topo);
trace_span_end(topo);
return;
}
assert(blkid && blk);
/* Annotate all transactions with the chainparams */
for (size_t i = 0; i < tal_count(blk->tx); i++)
blk->tx[i]->chainparams = chainparams;
/* Unexpected predecessor? Free predecessor, refetch it. */
if (!bitcoin_blkid_eq(&topo->tip->blkid, &blk->hdr.prev_hash))
remove_tip(topo);
else {
add_tip(topo, new_block(topo, blk, topo->tip->height + 1));
/* tell plugins a new block was processed */
notify_block_added(topo->ld, topo->tip);
}
/* Try for next one. */
trace_span_end(topo);
try_extend_tip(topo);
}
static void try_extend_tip(struct chain_topology *topo)
{
topo->extend_timer = NULL;
if (topo->stopping)
return;
trace_span_start("extend_tip", topo);
bitcoind_getrawblockbyheight(topo->bitcoind, topo->tip->height + 1,
get_new_block, topo);
}
static void init_topo(struct bitcoind *bitcoind UNUSED,
struct bitcoin_blkid *blkid UNUSED,
struct bitcoin_block *blk,
struct chain_topology *topo)
{
topo->root = new_block(topo, blk, topo->max_blockheight);
block_map_add(topo->block_map, topo->root);
topo->tip = topo->root;
topo->prev_tip = topo->tip->blkid;
/* In case we don't get all the way to updates_complete */
db_set_intvar(topo->bitcoind->ld->wallet->db,
"last_processed_block", topo->tip->height);
maybe_completed_init(topo);
}
u32 get_block_height(const struct chain_topology *topo)
{
return topo->tip->height;
}
u32 get_network_blockheight(const struct chain_topology *topo)
{
if (topo->tip->height > topo->headercount)
return topo->tip->height;
else
return topo->headercount;
}
u32 feerate_min(struct lightningd *ld, bool *unknown)
{
const struct chain_topology *topo = ld->topology;
u32 min;
if (unknown)
*unknown = false;
/* We allow the user to ignore the fee limits,
* although this comes with inherent risks.
*
* By enabling this option, users are explicitly
* made aware of the potential dangers.
* There are situations, such as the one described in [1],
* where it becomes necessary to bypass the fee limits to resolve
* issues like a stuck channel.
*
* BTW experimental-anchors feature provides a solution to this problem.
*
* [1] https://github.com/ElementsProject/lightning/issues/6362
* */
min = 0xFFFFFFFF;
for (size_t i = 0; i < ARRAY_SIZE(topo->feerates); i++) {
for (size_t j = 0; j < tal_count(topo->feerates[i]); j++) {
if (topo->feerates[i][j].rate < min)
min = topo->feerates[i][j].rate;
}
}
if (min == 0xFFFFFFFF) {
if (unknown)
*unknown = true;
min = 0;
}
/* FIXME: This is what bcli used to do: halve the slow feerate! */
min /= 2;
/* We can't allow less than feerate_floor, since that won't relay */
if (min < get_feerate_floor(topo))
return get_feerate_floor(topo);
return min;
}
u32 feerate_max(struct lightningd *ld, bool *unknown)
{
const struct chain_topology *topo = ld->topology;
u32 max = 0;
if (unknown)
*unknown = false;
for (size_t i = 0; i < ARRAY_SIZE(topo->feerates); i++) {
for (size_t j = 0; j < tal_count(topo->feerates[i]); j++) {
if (topo->feerates[i][j].rate > max)
max = topo->feerates[i][j].rate;
}
}
if (!max) {
if (unknown)
*unknown = true;
return UINT_MAX;
}
return max * topo->ld->config.max_fee_multiplier;
}
u32 default_locktime(const struct chain_topology *topo)
{
u32 locktime, current_height = get_block_height(topo);
/* Setting the locktime to the next block to be mined has multiple
* benefits:
* - anti fee-snipping (even if not yet likely)
* - less distinguishable transactions (with this we create
* general-purpose transactions which looks like bitcoind:
* native segwit, nlocktime set to tip, and sequence set to
* 0xFFFFFFFD by default. Other wallets are likely to implement
* this too).
*/
locktime = current_height;
/* Eventually fuzz it too. */
if (locktime > 100 && pseudorand(10) == 0)
locktime -= pseudorand(100);
return locktime;
}
/* On shutdown, channels get deleted last. That frees from our list, so
* do it now instead. */
static void destroy_chain_topology(struct chain_topology *topo)
{
struct outgoing_tx *otx;
struct outgoing_tx_map_iter it;
for (otx = outgoing_tx_map_first(topo->outgoing_txs, &it); otx;
otx = outgoing_tx_map_next(topo->outgoing_txs, &it)) {
tal_del_destructor2(otx, destroy_outgoing_tx, topo);
tal_free(otx);
}
}
struct chain_topology *new_topology(struct lightningd *ld, struct logger *log)
{
struct chain_topology *topo = tal(ld, struct chain_topology);
topo->ld = ld;
topo->block_map = tal(topo, struct block_map);
block_map_init(topo->block_map);
topo->outgoing_txs = tal(topo, struct outgoing_tx_map);
outgoing_tx_map_init(topo->outgoing_txs);
topo->txwatches = tal(topo, struct txwatch_hash);
txwatch_hash_init(topo->txwatches);
topo->txowatches = tal(topo, struct txowatch_hash);
txowatch_hash_init(topo->txowatches);
topo->log = log;
topo->bitcoind = new_bitcoind(topo, ld, log);
topo->poll_seconds = 30;
topo->feerate_uninitialized = true;
memset(topo->feerates, 0, sizeof(topo->feerates));
topo->smoothed_feerates = NULL;
topo->root = NULL;
topo->sync_waiters = tal(topo, struct list_head);
topo->extend_timer = NULL;
topo->rebroadcast_timer = NULL;
topo->stopping = false;
list_head_init(topo->sync_waiters);
return topo;
}
static void check_blockcount(struct chain_topology *topo, u32 blockcount)
{
/* If bitcoind's current blockheight is below the requested
* height, refuse. You can always explicitly request a reindex from
* that block number using --rescan=. */
if (blockcount < topo->max_blockheight) {
/* UINT32_MAX == no blocks in database */
if (topo->max_blockheight == UINT32_MAX) {
/* Relative rescan, but we didn't know the blockheight */
/* Protect against underflow in subtraction.
* Possible in regtest mode. */
if (blockcount < topo->bitcoind->ld->config.rescan)
topo->max_blockheight = 0;
else
topo->max_blockheight = blockcount - topo->bitcoind->ld->config.rescan;
} else
fatal("bitcoind has gone backwards from %u to %u blocks!",
topo->max_blockheight, blockcount);
}
/* Rollback to the given blockheight, so we start track
* correctly again */
wallet_blocks_rollback(topo->ld->wallet, topo->max_blockheight);
/* This may have unconfirmed txs: reconfirm as we add blocks. */
watch_for_utxo_reconfirmation(topo, topo->ld->wallet);
}
static void retry_check_chain(struct chain_topology *topo);
static void
check_chain(struct bitcoind *bitcoind, const char *chain,
const u32 headercount, const u32 blockcount, const bool ibd,
const bool first_call, struct chain_topology *topo)
{
if (!streq(chain, chainparams->bip70_name))
fatal("Wrong network! Our Bitcoin backend is running on '%s',"
" but we expect '%s'.", chain, chainparams->bip70_name);
topo->headercount = headercount;
if (first_call) {
/* Has the Bitcoin backend gone backward ? */
check_blockcount(topo, blockcount);
/* Get up to speed with topology. */
bitcoind_getrawblockbyheight(topo->bitcoind, topo->max_blockheight,
init_topo, topo);
}
if (ibd) {
if (first_call)
log_unusual(bitcoind->log,
"Waiting for initial block download (this can take"
" a while!)");
else
log_debug(bitcoind->log,
"Still waiting for initial block download");
} else if (headercount != blockcount) {
if (first_call)
log_unusual(bitcoind->log,
"Waiting for bitcoind to catch up"
" (%u blocks of %u)",
blockcount, headercount);
else
log_debug(bitcoind->log,
"Waiting for bitcoind to catch up"
" (%u blocks of %u)",
blockcount, headercount);
} else {
if (!first_call)
log_unusual(bitcoind->log,
"Bitcoin backend now synced.");
bitcoind->synced = true;
return;
}
assert(!bitcoind->checkchain_timer);
bitcoind->checkchain_timer
= new_reltimer(bitcoind->ld->timers, bitcoind,
/* Be 4x more aggressive in this case. */
time_divide(time_from_sec(bitcoind->ld->topology
->poll_seconds), 4),
retry_check_chain, bitcoind->ld->topology);
}
static void retry_check_chain(struct chain_topology *topo)
{
topo->bitcoind->checkchain_timer = NULL;
if (topo->stopping)
return;
bitcoind_getchaininfo(topo->bitcoind, false, topo->max_blockheight, check_chain, topo);
}
void setup_topology(struct chain_topology *topo,
u32 min_blockheight, u32 max_blockheight)
{
void *ret;
topo->min_blockheight = min_blockheight;
topo->max_blockheight = max_blockheight;
/* This waits for bitcoind. */
bitcoind_check_commands(topo->bitcoind);
/* For testing.. */
log_debug(topo->ld->log, "All Bitcoin plugin commands registered");
/* Sanity checks, then topology initialization. */
topo->bitcoind->checkchain_timer = NULL;
bitcoind_getchaininfo(topo->bitcoind, true, topo->max_blockheight, check_chain, topo);
tal_add_destructor(topo, destroy_chain_topology);
start_fee_estimate(topo);
/* Once it gets initial block, it calls io_break() and we return. */
ret = io_loop_with_timers(topo->ld);
assert(ret == topo);
log_debug(topo->ld->log, "io_loop_with_timers: %s", __func__);
}
void begin_topology(struct chain_topology *topo)
{
try_extend_tip(topo);
}
void stop_topology(struct chain_topology *topo)
{
/* Stop timers from re-arming. */
topo->stopping = true;
/* Remove timers while we're cleaning up plugins. */
tal_free(topo->bitcoind->checkchain_timer);
tal_free(topo->extend_timer);
tal_free(topo->updatefee_timer);
}
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