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watchtower: Add a struct containing the penalty base information

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Suggested-by: Rusty Russell <@rustyrussell>
This commit is contained in:
Christian Decker 2020-05-07 10:11:35 +09:30 committed by Rusty Russell
parent 3a881d9b41
commit 6e323ae0cd
3 changed files with 68 additions and 0 deletions
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1
common/Makefile
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@ -47,6 +47,7 @@ COMMON_SRC_NOGEN := \
common/onion.c \
common/onionreply.c \
common/param.c \
common/penalty_base.c \
common/per_peer_state.c \
common/peer_billboard.c \
common/peer_failed.c \

37
common/penalty_base.c Normal file
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@ -0,0 +1,37 @@
#include <assert.h>
#include <common/penalty_base.h>
#include <wire/wire.h>
/* txout must be within tx! */
struct penalty_base *penalty_base_new(const tal_t *ctx,
u64 commitment_num,
const struct bitcoin_tx *tx,
const struct wally_tx_output *txout)
{
struct penalty_base *pbase = tal(ctx, struct penalty_base);
pbase->commitment_num = commitment_num;
bitcoin_txid(tx, &pbase->txid);
pbase->outnum = txout - tx->wtx->outputs;
assert(pbase->outnum < tx->wtx->num_outputs);
pbase->amount.satoshis = txout->satoshi; /* Raw: from wally_tx_output */
return pbase;
}
void towire_penalty_base(u8 **pptr, const struct penalty_base *pbase)
{
towire_u64(pptr, pbase->commitment_num);
towire_bitcoin_txid(pptr, &pbase->txid);
towire_u32(pptr, pbase->outnum);
towire_amount_sat(pptr, pbase->amount);
}
void fromwire_penalty_base(const u8 **pptr, size_t *max,
struct penalty_base *pbase)
{
pbase->commitment_num = fromwire_u64(pptr, max);
fromwire_bitcoin_txid(pptr, max, &pbase->txid);
pbase->outnum = fromwire_u32(pptr, max);
pbase->amount = fromwire_amount_sat(pptr, max);
}

30
common/penalty_base.h Normal file
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@ -0,0 +1,30 @@
#ifndef LIGHTNING_COMMON_PENALTY_BASE_H
#define LIGHTNING_COMMON_PENALTY_BASE_H
#include "config.h"
#include <bitcoin/tx.h>
#include <ccan/short_types/short_types.h>
#include <common/amount.h>
/* To create a penalty, all we need are these. */
struct penalty_base {
/* The remote commitment index. */
u64 commitment_num;
/* The remote commitment txid. */
struct bitcoin_txid txid;
/* The remote commitment's "to-local" output. */
u32 outnum;
/* The amount of the remote commitment's "to-local" output. */
struct amount_sat amount;
};
/* txout must be within tx! */
struct penalty_base *penalty_base_new(const tal_t *ctx,
u64 commitment_num,
const struct bitcoin_tx *tx,
const struct wally_tx_output *txout);
void towire_penalty_base(u8 **pptr, const struct penalty_base *pbase);
void fromwire_penalty_base(const u8 **ptr, size_t *max,
struct penalty_base *pbase);
#endif /* LIGHTNING_COMMON_PENALTY_BASE_H */