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BIP141 indicates that the rule for block size has changed: witness bytes effectively count for 1, and non-witness bytes count for 4, but the maximum total has increased to 4,000,000. This means that fee estimates should use the witness cost (divided by 4), not the raw txlen. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
#ifndef LIGHTNING_BITCOIN_TX_H
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#define LIGHTNING_BITCOIN_TX_H
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#include "config.h"
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#include "shadouble.h"
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#include "signature.h"
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#include "varint.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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struct bitcoin_tx {
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u32 version;
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varint_t input_count;
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struct bitcoin_tx_input *input;
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varint_t output_count;
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struct bitcoin_tx_output *output;
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u32 lock_time;
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};
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struct bitcoin_tx_output {
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u64 amount;
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varint_t script_length;
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u8 *script;
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};
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struct bitcoin_tx_input {
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struct sha256_double txid;
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u32 index; /* output number referred to by above */
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varint_t script_length;
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u8 *script;
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u32 sequence_number;
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/* Value of the output we're spending (NULL if unknown). */
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u64 *amount;
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/* Only if BIP141 used. */
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u8 **witness;
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};
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/* SHA256^2 the tx: simpler than sha256_tx */
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void bitcoin_txid(const struct bitcoin_tx *tx, struct sha256_double *txid);
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/* Useful for signature code. */
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void sha256_tx_for_sig(struct sha256_double *h, const struct bitcoin_tx *tx,
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unsigned int input_num, enum sighash_type stype,
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const u8 *witness_script);
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/* Linear bytes of tx. */
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u8 *linearize_tx(const tal_t *ctx, const struct bitcoin_tx *tx);
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/* Force linearization in extended form; useful if 0 inputs. */
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u8 *linearize_tx_force_extended(const tal_t *ctx,
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const struct bitcoin_tx *tx);
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/* Get length of tx in bytes. */
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size_t measure_tx_len(const struct bitcoin_tx *tx);
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/* Get cost of tx in (x4 of non-witness bytecount). */
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size_t measure_tx_cost(const struct bitcoin_tx *tx);
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/* Allocate a tx: you just need to fill in inputs and outputs (they're
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* zeroed with inputs' sequence_number set to FFFFFFFF) */
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struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
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varint_t output_count);
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/* This takes a raw bitcoin tx in hex. */
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struct bitcoin_tx *bitcoin_tx_from_hex(const tal_t *ctx, const char *hex,
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size_t hexlen);
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/* Parse hex string to get txid (reversed, a-la bitcoind). */
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bool bitcoin_txid_from_hex(const char *hexstr, size_t hexstr_len,
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struct sha256_double *txid);
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/* Get hex string of txid (reversed, a-la bitcoind). */
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bool bitcoin_txid_to_hex(const struct sha256_double *txid,
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char *hexstr, size_t hexstr_len);
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/* Internal de-linearization functions. */
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struct bitcoin_tx *pull_bitcoin_tx(const tal_t *ctx,
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const u8 **cursor, size_t *max);
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u64 pull_varint(const u8 **cursor, size_t *max);
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const u8 *pull(const u8 **cursor, size_t *max, void *copy, size_t n);
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#endif /* LIGHTNING_BITCOIN_TX_H */
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