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df: update reserve calculation

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We can use the funding amount to derive the reserve requirement.
This commit is contained in:
niftynei 2021-02-03 16:13:57 -06:00 committed by Rusty Russell
parent 2719ff8c3b
commit a0cb7bd9b4
5 changed files with 73 additions and 27 deletions
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51
lightningd/dual_open_control.c
View File

@ -918,6 +918,46 @@ REGISTER_PLUGIN_HOOK(rbf_channel,
rbf_channel_hook_serialize,
struct rbf_channel_payload *);
static struct amount_sat calculate_reserve(struct channel_config *their_config,
struct amount_sat funding_total,
enum side opener)
{
struct amount_sat reserve, dust_limit;
/* BOLT-fe0351ca2cea3105c4f2eb18c571afca9d21c85b #2
*
* The channel reserve is fixed at 1% of the total channel balance
* rounded down (sum of `funding_satoshis` from `open_channel2`
* and `accept_channel2`) or the `dust_limit_satoshis` from
* `open_channel2`, whichever is greater.
*/
reserve = amount_sat_div(funding_total, 100);
dust_limit = opener == LOCAL ?
chainparams->dust_limit :
their_config->dust_limit;
if (amount_sat_greater(dust_limit, reserve))
return dust_limit;
return reserve;
}
static void channel_update_reserve(struct channel *channel,
struct channel_config *their_config,
struct amount_sat funding_total)
{
struct amount_sat reserve;
reserve = calculate_reserve(their_config,
funding_total,
channel->opener);
/* Depending on path, these are disjoint */
their_config->channel_reserve = reserve;
channel->channel_info.their_config.channel_reserve = reserve;
channel->our_config.channel_reserve = reserve;
}
/* Steals fields from uncommitted_channel: returns NULL if can't generate a
* key for this channel (shouldn't happen!). */
static struct channel_inflight *
@ -1432,6 +1472,11 @@ void dualopen_tell_depth(struct subd *dualopend,
channel->last_tx = tal_steal(channel, inf->last_tx);
channel->last_sig = inf->last_sig;
/* Update the reserve */
channel_update_reserve(channel,
&channel->channel_info.their_config,
inf->funding->total_funds);
wallet_channel_save(dualopend->ld->wallet, channel);
/* FIXME: delete inflights */
}
@ -2230,7 +2275,6 @@ static void handle_commit_received(struct subd *dualopend,
&channel->channel_flags,
&feerate_funding,
&feerate_commitment,
&channel->our_config.channel_reserve,
&local_upfront_shutdown_script,
&remote_upfront_shutdown_script)) {
log_broken(channel->log, "bad WIRE_DUALOPEND_COMMIT_RCVD %s",
@ -2245,6 +2289,11 @@ static void handle_commit_received(struct subd *dualopend,
unsaved_channel_disconnect(channel, LOG_BROKEN, err_reason);
goto failed;
}
/* We need to update the channel reserve on the config */
channel_update_reserve(channel,
&channel_info.their_config,
total_funding);
if (!(inflight = wallet_commit_channel(ld, channel,
remote_commit,

34
openingd/dualopend.c
View File

@ -445,28 +445,30 @@ static void check_channel_id(struct state *state,
}
static void set_reserve(struct tx_state *tx_state,
struct amount_sat funding_total)
struct amount_sat funding_total,
enum tx_role our_role)
{
struct amount_sat reserve;
struct amount_sat reserve, dust_limit;
/* BOLT-fe0351ca2cea3105c4f2eb18c571afca9d21c85b #2
*
* The channel reserve is fixed at 1% of the total channel balance
* rounded down (sum of `funding_satoshis` from `open_channel2`
* and `accept_channel2`) or the `dust_limit_satoshis`, whichever
* is greater.
* and `accept_channel2`) or the `dust_limit_satoshis` from
* `open_channel2`, whichever is greater.
*/
reserve = amount_sat_div(funding_total, 100);
dust_limit = our_role == TX_INITIATOR ?
tx_state->localconf.dust_limit :
tx_state->remoteconf.dust_limit;
if (amount_sat_greater(tx_state->remoteconf.dust_limit, reserve))
tx_state->remoteconf.channel_reserve = tx_state->remoteconf.dust_limit;
else
if (amount_sat_greater(dust_limit, reserve)) {
tx_state->remoteconf.channel_reserve = dust_limit;
tx_state->localconf.channel_reserve = dust_limit;
} else {
tx_state->remoteconf.channel_reserve = reserve;
if (amount_sat_greater(tx_state->localconf.dust_limit, reserve))
tx_state->localconf.channel_reserve = tx_state->localconf.dust_limit;
else
tx_state->localconf.channel_reserve = reserve;
}
}
static bool is_openers(const struct wally_map *unknowns)
@ -1717,7 +1719,6 @@ static u8 *accepter_commits(struct state *state,
state->channel_flags,
tx_state->feerate_per_kw_funding,
state->feerate_per_kw_commitment,
tx_state->localconf.channel_reserve,
state->upfront_shutdown_script[LOCAL],
state->upfront_shutdown_script[REMOTE]);
@ -1897,7 +1898,7 @@ static void accepter_start(struct state *state, const u8 *oc2_msg)
init_changeset(tx_state, tx_state->psbt);
/* Now that we know the total of the channel, we can set the reserve */
set_reserve(tx_state, total);
set_reserve(tx_state, total, state->our_role);
if (!check_config_bounds(tmpctx, total,
state->feerate_per_kw_commitment,
@ -2221,7 +2222,6 @@ static u8 *opener_commits(struct state *state,
state->channel_flags,
tx_state->feerate_per_kw_funding,
state->feerate_per_kw_commitment,
tx_state->localconf.channel_reserve,
state->upfront_shutdown_script[LOCAL],
state->upfront_shutdown_script[REMOTE]);
@ -2431,7 +2431,7 @@ static void opener_start(struct state *state, u8 *msg)
/* Now that we know the total of the channel, we can
* set the reserve */
set_reserve(tx_state, total);
set_reserve(tx_state, total, state->our_role);
if (!check_config_bounds(tmpctx, total,
state->feerate_per_kw_commitment,
@ -2698,7 +2698,7 @@ static void rbf_local_start(struct state *state, u8 *msg)
}
/* Now that we know the total of the channel, we can set the reserve */
set_reserve(tx_state, total);
set_reserve(tx_state, total, state->our_role);
if (!check_config_bounds(tmpctx, total,
state->feerate_per_kw_commitment,
@ -2829,7 +2829,7 @@ static void rbf_remote_start(struct state *state, const u8 *rbf_msg)
}
/* Now that we know the total of the channel, we can set the reserve */
set_reserve(tx_state, total);
set_reserve(tx_state, total, state->our_role);
if (!check_config_bounds(tmpctx, total,
state->feerate_per_kw_commitment,

1
openingd/dualopend_wire.csv
View File

@ -146,7 +146,6 @@ msgdata,dualopend_commit_rcvd,our_funding_sats,amount_sat,
msgdata,dualopend_commit_rcvd,channel_flags,u8,
msgdata,dualopend_commit_rcvd,feerate_per_kw_funding,u32,
msgdata,dualopend_commit_rcvd,feerate_per_kw_commitment,u32,
msgdata,dualopend_commit_rcvd,our_channel_reserve_satoshis,amount_sat,
msgdata,dualopend_commit_rcvd,local_shutdown_len,u16,
msgdata,dualopend_commit_rcvd,local_shutdown_scriptpubkey,u8,local_shutdown_len
msgdata,dualopend_commit_rcvd,remote_shutdown_len,u16,

Can't render this file because it has a wrong number of fields in line 13.

8
openingd/dualopend_wiregen.c generated
View File

@ -490,7 +490,7 @@ bool fromwire_dualopend_rbf_init(const tal_t *ctx, const void *p, struct amount_
/* WIRE: DUALOPEND_COMMIT_RCVD */
/* dualopend->master: ready to commit channel open to database and */
/* get some signatures for the funding_tx. */
u8 *towire_dualopend_commit_rcvd(const tal_t *ctx, const struct channel_config *their_config, const struct bitcoin_tx *remote_first_commit, const struct penalty_base *pbase, const struct bitcoin_signature *first_commit_sig, const struct wally_psbt *psbt, const struct pubkey *revocation_basepoint, const struct pubkey *payment_basepoint, const struct pubkey *htlc_basepoint, const struct pubkey *delayed_payment_basepoint, const struct pubkey *their_per_commit_point, const struct pubkey *remote_fundingkey, const struct bitcoin_txid *funding_txid, u16 funding_txout, struct amount_sat funding_satoshis, struct amount_sat our_funding_sats, u8 channel_flags, u32 feerate_per_kw_funding, u32 feerate_per_kw_commitment, struct amount_sat our_channel_reserve_satoshis, const u8 *local_shutdown_scriptpubkey, const u8 *remote_shutdown_scriptpubkey)
u8 *towire_dualopend_commit_rcvd(const tal_t *ctx, const struct channel_config *their_config, const struct bitcoin_tx *remote_first_commit, const struct penalty_base *pbase, const struct bitcoin_signature *first_commit_sig, const struct wally_psbt *psbt, const struct pubkey *revocation_basepoint, const struct pubkey *payment_basepoint, const struct pubkey *htlc_basepoint, const struct pubkey *delayed_payment_basepoint, const struct pubkey *their_per_commit_point, const struct pubkey *remote_fundingkey, const struct bitcoin_txid *funding_txid, u16 funding_txout, struct amount_sat funding_satoshis, struct amount_sat our_funding_sats, u8 channel_flags, u32 feerate_per_kw_funding, u32 feerate_per_kw_commitment, const u8 *local_shutdown_scriptpubkey, const u8 *remote_shutdown_scriptpubkey)
{
u16 local_shutdown_len = tal_count(local_shutdown_scriptpubkey);
u16 remote_shutdown_len = tal_count(remote_shutdown_scriptpubkey);
@ -520,7 +520,6 @@ u8 *towire_dualopend_commit_rcvd(const tal_t *ctx, const struct channel_config *
towire_u8(&p, channel_flags);
towire_u32(&p, feerate_per_kw_funding);
towire_u32(&p, feerate_per_kw_commitment);
towire_amount_sat(&p, our_channel_reserve_satoshis);
towire_u16(&p, local_shutdown_len);
towire_u8_array(&p, local_shutdown_scriptpubkey, local_shutdown_len);
towire_u16(&p, remote_shutdown_len);
@ -528,7 +527,7 @@ u8 *towire_dualopend_commit_rcvd(const tal_t *ctx, const struct channel_config *
return memcheck(p, tal_count(p));
}
bool fromwire_dualopend_commit_rcvd(const tal_t *ctx, const void *p, struct channel_config *their_config, struct bitcoin_tx **remote_first_commit, struct penalty_base **pbase, struct bitcoin_signature *first_commit_sig, struct wally_psbt **psbt, struct pubkey *revocation_basepoint, struct pubkey *payment_basepoint, struct pubkey *htlc_basepoint, struct pubkey *delayed_payment_basepoint, struct pubkey *their_per_commit_point, struct pubkey *remote_fundingkey, struct bitcoin_txid *funding_txid, u16 *funding_txout, struct amount_sat *funding_satoshis, struct amount_sat *our_funding_sats, u8 *channel_flags, u32 *feerate_per_kw_funding, u32 *feerate_per_kw_commitment, struct amount_sat *our_channel_reserve_satoshis, u8 **local_shutdown_scriptpubkey, u8 **remote_shutdown_scriptpubkey)
bool fromwire_dualopend_commit_rcvd(const tal_t *ctx, const void *p, struct channel_config *their_config, struct bitcoin_tx **remote_first_commit, struct penalty_base **pbase, struct bitcoin_signature *first_commit_sig, struct wally_psbt **psbt, struct pubkey *revocation_basepoint, struct pubkey *payment_basepoint, struct pubkey *htlc_basepoint, struct pubkey *delayed_payment_basepoint, struct pubkey *their_per_commit_point, struct pubkey *remote_fundingkey, struct bitcoin_txid *funding_txid, u16 *funding_txout, struct amount_sat *funding_satoshis, struct amount_sat *our_funding_sats, u8 *channel_flags, u32 *feerate_per_kw_funding, u32 *feerate_per_kw_commitment, u8 **local_shutdown_scriptpubkey, u8 **remote_shutdown_scriptpubkey)
{
u16 local_shutdown_len;
u16 remote_shutdown_len;
@ -561,7 +560,6 @@ bool fromwire_dualopend_commit_rcvd(const tal_t *ctx, const void *p, struct chan
*channel_flags = fromwire_u8(&cursor, &plen);
*feerate_per_kw_funding = fromwire_u32(&cursor, &plen);
*feerate_per_kw_commitment = fromwire_u32(&cursor, &plen);
*our_channel_reserve_satoshis = fromwire_amount_sat(&cursor, &plen);
local_shutdown_len = fromwire_u16(&cursor, &plen);
// 2nd case local_shutdown_scriptpubkey
*local_shutdown_scriptpubkey = local_shutdown_len ? tal_arr(ctx, u8, local_shutdown_len) : NULL;
@ -996,4 +994,4 @@ bool fromwire_dualopend_dev_memleak_reply(const void *p, bool *leak)
*leak = fromwire_bool(&cursor, &plen);
return cursor != NULL;
}
// SHA256STAMP:ac2f996019c8461a99192330f4d2cc506fc8c6dcebf2f0ce56f7b53157ffffe4
// SHA256STAMP:6212fc1bc5a22513c105ad2f18046e6e724ccd98aa5f94a9228fb3a1aa45e11f

6
openingd/dualopend_wiregen.h generated
View File

@ -136,8 +136,8 @@ bool fromwire_dualopend_rbf_init(const tal_t *ctx, const void *p, struct amount_
/* WIRE: DUALOPEND_COMMIT_RCVD */
/* dualopend->master: ready to commit channel open to database and */
/* get some signatures for the funding_tx. */
u8 *towire_dualopend_commit_rcvd(const tal_t *ctx, const struct channel_config *their_config, const struct bitcoin_tx *remote_first_commit, const struct penalty_base *pbase, const struct bitcoin_signature *first_commit_sig, const struct wally_psbt *psbt, const struct pubkey *revocation_basepoint, const struct pubkey *payment_basepoint, const struct pubkey *htlc_basepoint, const struct pubkey *delayed_payment_basepoint, const struct pubkey *their_per_commit_point, const struct pubkey *remote_fundingkey, const struct bitcoin_txid *funding_txid, u16 funding_txout, struct amount_sat funding_satoshis, struct amount_sat our_funding_sats, u8 channel_flags, u32 feerate_per_kw_funding, u32 feerate_per_kw_commitment, struct amount_sat our_channel_reserve_satoshis, const u8 *local_shutdown_scriptpubkey, const u8 *remote_shutdown_scriptpubkey);
bool fromwire_dualopend_commit_rcvd(const tal_t *ctx, const void *p, struct channel_config *their_config, struct bitcoin_tx **remote_first_commit, struct penalty_base **pbase, struct bitcoin_signature *first_commit_sig, struct wally_psbt **psbt, struct pubkey *revocation_basepoint, struct pubkey *payment_basepoint, struct pubkey *htlc_basepoint, struct pubkey *delayed_payment_basepoint, struct pubkey *their_per_commit_point, struct pubkey *remote_fundingkey, struct bitcoin_txid *funding_txid, u16 *funding_txout, struct amount_sat *funding_satoshis, struct amount_sat *our_funding_sats, u8 *channel_flags, u32 *feerate_per_kw_funding, u32 *feerate_per_kw_commitment, struct amount_sat *our_channel_reserve_satoshis, u8 **local_shutdown_scriptpubkey, u8 **remote_shutdown_scriptpubkey);
u8 *towire_dualopend_commit_rcvd(const tal_t *ctx, const struct channel_config *their_config, const struct bitcoin_tx *remote_first_commit, const struct penalty_base *pbase, const struct bitcoin_signature *first_commit_sig, const struct wally_psbt *psbt, const struct pubkey *revocation_basepoint, const struct pubkey *payment_basepoint, const struct pubkey *htlc_basepoint, const struct pubkey *delayed_payment_basepoint, const struct pubkey *their_per_commit_point, const struct pubkey *remote_fundingkey, const struct bitcoin_txid *funding_txid, u16 funding_txout, struct amount_sat funding_satoshis, struct amount_sat our_funding_sats, u8 channel_flags, u32 feerate_per_kw_funding, u32 feerate_per_kw_commitment, const u8 *local_shutdown_scriptpubkey, const u8 *remote_shutdown_scriptpubkey);
bool fromwire_dualopend_commit_rcvd(const tal_t *ctx, const void *p, struct channel_config *their_config, struct bitcoin_tx **remote_first_commit, struct penalty_base **pbase, struct bitcoin_signature *first_commit_sig, struct wally_psbt **psbt, struct pubkey *revocation_basepoint, struct pubkey *payment_basepoint, struct pubkey *htlc_basepoint, struct pubkey *delayed_payment_basepoint, struct pubkey *their_per_commit_point, struct pubkey *remote_fundingkey, struct bitcoin_txid *funding_txid, u16 *funding_txout, struct amount_sat *funding_satoshis, struct amount_sat *our_funding_sats, u8 *channel_flags, u32 *feerate_per_kw_funding, u32 *feerate_per_kw_commitment, u8 **local_shutdown_scriptpubkey, u8 **remote_shutdown_scriptpubkey);
/* WIRE: DUALOPEND_PSBT_CHANGED */
/* dualopend->master: peer updated the psbt */
@ -230,4 +230,4 @@ bool fromwire_dualopend_dev_memleak_reply(const void *p, bool *leak);
#endif /* LIGHTNING_OPENINGD_DUALOPEND_WIREGEN_H */
// SHA256STAMP:ac2f996019c8461a99192330f4d2cc506fc8c6dcebf2f0ce56f7b53157ffffe4
// SHA256STAMP:6212fc1bc5a22513c105ad2f18046e6e724ccd98aa5f94a9228fb3a1aa45e11f