core-lightning/common/htlc_wire.c

#include <bitcoin/tx.h>
#include <ccan/array_size/array_size.h>
#include <ccan/crypto/shachain/shachain.h>
#include <common/htlc_wire.h>
#include <common/memleak.h>
#include <wire/wire.h>

/* FIXME: We could adapt tools/generate-wire.py to generate structures
 * and code like this. */
void towire_added_htlc(u8 **pptr, const struct added_htlc *added)
{
	towire_u64(pptr, added->id);
	towire_amount_msat(pptr, added->amount);
 	towire_sha256(pptr, &added->payment_hash);
	towire_u32(pptr, added->cltv_expiry);
	towire(pptr, added->onion_routing_packet,
	       sizeof(added->onion_routing_packet));
}

void towire_fulfilled_htlc(u8 **pptr, const struct fulfilled_htlc *fulfilled)
{
	towire_u64(pptr, fulfilled->id);
	towire_preimage(pptr, &fulfilled->payment_preimage);
}

void towire_failed_htlc(u8 **pptr, const struct failed_htlc *failed)
{
	/* Only one can be set. */
	assert(failed->failcode || tal_count(failed->failreason));
	assert(!failed->failcode || !tal_count(failed->failreason));
	towire_u64(pptr, failed->id);
	towire_u16(pptr, failed->failcode);
	if (failed->failcode & UPDATE) {
		assert(!failed->failreason);
		towire_short_channel_id(pptr, failed->scid);
	} else {
		assert(!failed->scid);
		if (!failed->failcode) {
			assert(failed->failreason);
			towire_u16(pptr, tal_count(failed->failreason));
			towire_u8_array(pptr, failed->failreason,
					tal_count(failed->failreason));
		}
	}
}

void towire_htlc_state(u8 **pptr, const enum htlc_state hstate)
{
	towire_u8(pptr, hstate);
}

void towire_changed_htlc(u8 **pptr, const struct changed_htlc *changed)
{
	towire_htlc_state(pptr, changed->newstate);
	towire_u64(pptr, changed->id);
}

void towire_side(u8 **pptr, const enum side side)
{
	towire_u8(pptr, side);
}

void towire_shachain(u8 **pptr, const struct shachain *shachain)
{
	size_t i;

	towire_u64(pptr, shachain->min_index);
	towire_u32(pptr, shachain->num_valid);

	for (i = 0; i < shachain->num_valid; i++) {
		towire_u64(pptr, shachain->known[i].index);
		towire_sha256(pptr, &shachain->known[i].hash);
	}
}

void fromwire_added_htlc(const u8 **cursor, size_t *max,
			 struct added_htlc *added)
{
	added->id = fromwire_u64(cursor, max);
	added->amount = fromwire_amount_msat(cursor, max);
	fromwire_sha256(cursor, max, &added->payment_hash);
	added->cltv_expiry = fromwire_u32(cursor, max);
	fromwire(cursor, max, added->onion_routing_packet,
		 sizeof(added->onion_routing_packet));
}

void fromwire_fulfilled_htlc(const u8 **cursor, size_t *max,
			     struct fulfilled_htlc *fulfilled)
{
	fulfilled->id = fromwire_u64(cursor, max);
	fromwire_preimage(cursor, max, &fulfilled->payment_preimage);
}

struct failed_htlc *fromwire_failed_htlc(const tal_t *ctx, const u8 **cursor, size_t *max)
{
	struct failed_htlc *failed = tal(ctx, struct failed_htlc);

	failed->id = fromwire_u64(cursor, max);
	failed->failcode = fromwire_u16(cursor, max);
	if (failed->failcode == 0) {
		u16 failreason_len;
		failed->scid = NULL;
		failreason_len = fromwire_u16(cursor, max);
		failed->failreason = tal_arr(failed, u8, failreason_len);
		fromwire_u8_array(cursor, max, failed->failreason,
				  failreason_len);
	} else {
		failed->failreason = NULL;
		if (failed->failcode & UPDATE) {
			failed->scid = tal(failed, struct short_channel_id);
			fromwire_short_channel_id(cursor, max, failed->scid);
		} else {
			failed->scid = NULL;
		}
	}

	return failed;
}

enum htlc_state fromwire_htlc_state(const u8 **cursor, size_t *max)
{
	enum htlc_state hstate = fromwire_u8(cursor, max);
	if (hstate >= HTLC_STATE_INVALID) {
		hstate = HTLC_STATE_INVALID;
		fromwire_fail(cursor, max);
	}
	return hstate;
}

void fromwire_changed_htlc(const u8 **cursor, size_t *max,
			   struct changed_htlc *changed)
{
	changed->newstate = fromwire_htlc_state(cursor, max);
	changed->id = fromwire_u64(cursor, max);
}

enum side fromwire_side(const u8 **cursor, size_t *max)
{
	enum side side = fromwire_u8(cursor, max);
	if (side >= NUM_SIDES) {
		side = NUM_SIDES;
		fromwire_fail(cursor, max);
	}
	return side;
}

void fromwire_shachain(const u8 **cursor, size_t *max,
		       struct shachain *shachain)
{
	size_t i;

	shachain->min_index = fromwire_u64(cursor, max);
	shachain->num_valid = fromwire_u32(cursor, max);
	if (shachain->num_valid > ARRAY_SIZE(shachain->known)) {
		fromwire_fail(cursor, max);
		return;
	}
	for (i = 0; i < shachain->num_valid; i++) {
		shachain->known[i].index = fromwire_u64(cursor, max);
		fromwire_sha256(cursor, max, &shachain->known[i].hash);
	}
}