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177 lines
6.3 KiB
C
177 lines
6.3 KiB
C
#ifndef LIGHTNING_COMMON_AMOUNT_H
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#define LIGHTNING_COMMON_AMOUNT_H
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#include "config.h"
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#include <ccan/build_assert/build_assert.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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#include <stdbool.h>
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#define MSAT_PER_SAT ((u64)1000)
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#define SAT_PER_BTC ((u64)100000000)
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#define MSAT_PER_BTC (MSAT_PER_SAT * SAT_PER_BTC)
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/* Use these to wrap amounts, for typesafety. Please use ops where possible,
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* rather than accessing the members directly. */
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struct amount_sat {
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/* Amount in satoshis. */
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u64 satoshis;
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};
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struct amount_msat {
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/* Amount in millisatoshis. */
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u64 millisatoshis;
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};
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struct amount_asset {
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u64 value;
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u8 asset[33]; /* 1 version byte + 32 byte asset_tag */
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};
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/* For constants only: others must be built from primitives! */
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#if HAVE_BUILTIN_CONSTANT_P
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#define AMOUNT_MUST_BE_CONST(c) BUILD_ASSERT_OR_ZERO(IS_COMPILE_CONSTANT(c))
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#else
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#define AMOUNT_MUST_BE_CONST(c) 0
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#endif
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/* GCC 4.8.5 (Centos 7.6!) thinks struct casts are not constants, so we
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* need to not use a cast for static initializations. */
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#define AMOUNT_MSAT_INIT(msat) \
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{ .millisatoshis = (msat) }
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#define AMOUNT_SAT_INIT(sat) \
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{ .satoshis = (sat) }
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#define AMOUNT_MSAT(constant) \
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((struct amount_msat){(constant) + AMOUNT_MUST_BE_CONST(constant)})
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#define AMOUNT_SAT(constant) \
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((struct amount_sat){(constant) + AMOUNT_MUST_BE_CONST(constant)})
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/* You may not always be able to convert satoshis->millisatoshis. */
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WARN_UNUSED_RESULT bool amount_sat_to_msat(struct amount_msat *msat,
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struct amount_sat sat);
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/* You can always truncate millisatoshis->satoshis. */
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struct amount_sat amount_msat_to_sat_round_down(struct amount_msat msat);
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/* Simple operations: val = a + b, val = a - b. */
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WARN_UNUSED_RESULT bool amount_msat_add(struct amount_msat *val,
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struct amount_msat a,
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struct amount_msat b);
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WARN_UNUSED_RESULT bool amount_msat_sub(struct amount_msat *val,
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struct amount_msat a,
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struct amount_msat b);
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WARN_UNUSED_RESULT bool amount_sat_add(struct amount_sat *val,
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struct amount_sat a,
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struct amount_sat b);
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WARN_UNUSED_RESULT bool amount_sat_sub(struct amount_sat *val,
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struct amount_sat a,
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struct amount_sat b);
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WARN_UNUSED_RESULT bool amount_msat_sub_sat(struct amount_msat *val,
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struct amount_msat a,
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struct amount_sat b);
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WARN_UNUSED_RESULT bool amount_msat_add_sat(struct amount_msat *val,
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struct amount_msat a,
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struct amount_sat b);
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WARN_UNUSED_RESULT bool amount_sat_sub_msat(struct amount_msat *val,
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struct amount_sat a,
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struct amount_msat b);
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/* Is a == b? */
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bool amount_sat_eq(struct amount_sat a, struct amount_sat b);
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bool amount_msat_eq(struct amount_msat a, struct amount_msat b);
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/* Is a > b? */
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bool amount_sat_greater(struct amount_sat a, struct amount_sat b);
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bool amount_msat_greater(struct amount_msat a, struct amount_msat b);
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/* Is a >= b */
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bool amount_sat_greater_eq(struct amount_sat a, struct amount_sat b);
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bool amount_msat_greater_eq(struct amount_msat a, struct amount_msat b);
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/* Is a < b? */
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bool amount_sat_less(struct amount_sat a, struct amount_sat b);
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bool amount_msat_less(struct amount_msat a, struct amount_msat b);
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/* Is a <= b? */
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bool amount_sat_less_eq(struct amount_sat a, struct amount_sat b);
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bool amount_msat_less_eq(struct amount_msat a, struct amount_msat b);
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/* Is msat > sat? */
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bool amount_msat_greater_sat(struct amount_msat msat, struct amount_sat sat);
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/* Is msat >= sat? */
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bool amount_msat_greater_eq_sat(struct amount_msat msat, struct amount_sat sat);
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/* Is msat < sat? */
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bool amount_msat_less_sat(struct amount_msat msat, struct amount_sat sat);
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/* Is msat <= sat? */
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bool amount_msat_less_eq_sat(struct amount_msat msat, struct amount_sat sat);
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/* Is msat == sat? */
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bool amount_msat_eq_sat(struct amount_msat msat, struct amount_sat sat);
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/* Check whether this asset is actually the main / fee-paying asset of the
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* current chain. */
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bool amount_asset_is_main(struct amount_asset *asset);
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/* Convert from a generic asset to the fee-paying asset if possible. */
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struct amount_sat amount_asset_to_sat(struct amount_asset *asset);
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/* Returns true if msat fits in a u32 value. */
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WARN_UNUSED_RESULT bool amount_msat_to_u32(struct amount_msat msat,
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u32 *millisatoshis);
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/* Programatically initialize from various types */
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void amount_msat_from_u64(struct amount_msat *msat, u64 millisatoshis);
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WARN_UNUSED_RESULT bool amount_msat_from_sat_u64(struct amount_msat *msat, u64 satoshis);
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/* Common operation: what is the HTLC fee for given feerate? Can overflow! */
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WARN_UNUSED_RESULT bool amount_msat_fee(struct amount_msat *fee,
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struct amount_msat amt,
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u32 fee_base_msat,
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u32 fee_proportional_millionths);
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/* Same, but add into amt. */
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WARN_UNUSED_RESULT bool amount_msat_add_fee(struct amount_msat *amt,
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u32 fee_base_msat,
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u32 fee_proportional_millionths);
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/* What is the fee for this tx weight? */
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struct amount_sat amount_tx_fee(u32 fee_per_kw, size_t weight);
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/* Different formatting by amounts: btc, sat and msat */
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/* => 1.23456789012btc (11 decimals!) */
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const char *fmt_amount_msat_btc(const tal_t *ctx,
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const struct amount_msat *msat,
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bool append_unit);
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/* => 1234msat */
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const char *fmt_amount_msat(const tal_t *ctx, const struct amount_msat *msat);
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/* => 1.23456789btc (8 decimals!) */
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const char *fmt_amount_sat_btc(const tal_t *ctx,
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const struct amount_sat *sat,
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bool append_unit);
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/* => 1234sat */
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const char *fmt_amount_sat(const tal_t *ctx, const struct amount_sat *sat);
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/* Valid strings:
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* [0-9]+ => millisatoshi.
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* [0-9]+msat => millisatoshi.
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* [0-9]+sat => *1000 -> millisatopshi.
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* [0-9]+.[0-9]{1,11}btc => millisatoshi.
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*/
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bool parse_amount_msat(struct amount_msat *msat, const char *s, size_t slen);
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/* Valid strings:
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* [0-9]+ => satoshi.
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* [0-9]+sat => satoshi.
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* [0-9]+000msat => satoshi.
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* [0-9]+.[0-9]{1,8}btc => satoshi.
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*/
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bool parse_amount_sat(struct amount_sat *sat, const char *s, size_t slen);
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/* Marshal/unmarshal functions */
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struct amount_msat fromwire_amount_msat(const u8 **cursor, size_t *max);
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struct amount_sat fromwire_amount_sat(const u8 **cursor, size_t *max);
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void towire_amount_msat(u8 **pptr, const struct amount_msat msat);
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void towire_amount_sat(u8 **pptr, const struct amount_sat sat);
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#endif /* LIGHTNING_COMMON_AMOUNT_H */
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