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#ifndef LIGHTNING_DAEMON_HTLC_H
#define LIGHTNING_DAEMON_HTLC_H
#include "config.h"
#include "bitcoin/locktime.h"
#include "channel.h"
#include "htlc_state.h"
#include "pseudorand.h"
#include <assert.h>
#include <ccan/crypto/sha256/sha256.h>
#include <ccan/crypto/siphash24/siphash24.h>
#include <ccan/htable/htable_type.h>
#include <ccan/short_types/short_types.h>
/* What are we doing: adding or removing? */
#define HTLC_ADDING 0x400
#define HTLC_REMOVING 0x800
/* Uncommitted change is pending */
#define HTLC_F_PENDING 0x01
/* HTLC is in commit_tx */
#define HTLC_F_COMMITTED 0x02
/* We have revoked the previous commit_tx */
#define HTLC_F_REVOKED 0x04
/* We offered it it. */
#define HTLC_F_OWNER 0x08
/* HTLC was ever in a commit_tx */
#define HTLC_F_WAS_COMMITTED 0x10
/* Each of the above flags applies to both sides */
#define HTLC_FLAG(side,flag) ((flag) << ((side) * 5))
#define HTLC_REMOTE_F_PENDING HTLC_FLAG(REMOTE,HTLC_F_PENDING)
#define HTLC_REMOTE_F_COMMITTED HTLC_FLAG(REMOTE,HTLC_F_COMMITTED)
#define HTLC_REMOTE_F_REVOKED HTLC_FLAG(REMOTE,HTLC_F_REVOKED)
#define HTLC_REMOTE_F_OWNER HTLC_FLAG(REMOTE,HTLC_F_OWNER)
#define HTLC_REMOTE_F_WAS_COMMITTED HTLC_FLAG(REMOTE,HTLC_F_WAS_COMMITTED)
#define HTLC_LOCAL_F_PENDING HTLC_FLAG(LOCAL,HTLC_F_PENDING)
#define HTLC_LOCAL_F_COMMITTED HTLC_FLAG(LOCAL,HTLC_F_COMMITTED)
#define HTLC_LOCAL_F_REVOKED HTLC_FLAG(LOCAL,HTLC_F_REVOKED)
#define HTLC_LOCAL_F_OWNER HTLC_FLAG(LOCAL,HTLC_F_OWNER)
#define HTLC_LOCAL_F_WAS_COMMITTED HTLC_FLAG(LOCAL,HTLC_F_WAS_COMMITTED)
struct htlc {
/* Useful for debugging, and decoding via ->src. */
struct peer *peer;
/* Block number where we abort if it's still live (LOCAL only) */
u32 deadline;
/* What's the status. */
enum htlc_state state;
/* The unique ID for this peer and this direction (LOCAL or REMOTE) */
u64 id;
/* The amount in millisatoshi. */
u64 msatoshi;
/* When the HTLC can no longer be redeemed. */
struct abs_locktime expiry;
/* The hash of the preimage which can redeem this HTLC */
struct sha256 rhash;
/* The preimage which hashes to rhash (if known) */
struct rval *r;
/* FIXME: We could union these together: */
/* Routing information sent with this HTLC. */
const u8 *routing;
/* Previous HTLC (if any) which made us offer this (LOCAL only) */
struct htlc *src;
const u8 *fail;
};
const char *htlc_state_name(enum htlc_state s);
enum htlc_state htlc_state_from_name(const char *name);
void htlc_changestate(struct htlc *h,
enum htlc_state oldstate,
enum htlc_state newstate,
bool db_commit);
int htlc_state_flags(enum htlc_state state);
static inline bool htlc_has(const struct htlc *h, int flag)
{
return htlc_state_flags(h->state) & flag;
}
static inline enum side htlc_state_owner(enum htlc_state state)
{
if (state < RCVD_ADD_HTLC) {
assert((htlc_state_flags(state)
& (HTLC_REMOTE_F_OWNER|HTLC_LOCAL_F_OWNER))
== HTLC_LOCAL_F_OWNER);
return LOCAL;
} else {
assert((htlc_state_flags(state)
& (HTLC_REMOTE_F_OWNER|HTLC_LOCAL_F_OWNER))
== HTLC_REMOTE_F_OWNER);
return REMOTE;
}
}
static inline enum side htlc_owner(const struct htlc *h)
{
return htlc_state_owner(h->state);
}
void htlc_undostate(struct htlc *h,
enum htlc_state oldstate, enum htlc_state newstate);
/* htlc_map: ID -> htlc mapping. */
static inline u64 htlc_key(const struct htlc *h)
{
return h->id;
}
static inline bool htlc_cmp(const struct htlc *h, u64 id)
{
return h->id == id;
}
static inline size_t htlc_hash(u64 id)
{
return siphash24(siphash_seed(), &id, sizeof(id));
}
HTABLE_DEFINE_TYPE(struct htlc, htlc_key, htlc_hash, htlc_cmp, htlc_map);
static inline struct htlc *htlc_get(struct htlc_map *htlcs, u64 id, enum side owner)
{
struct htlc *h;
struct htlc_map_iter it;
for (h = htlc_map_getfirst(htlcs, id, &it);
h;
h = htlc_map_getnext(htlcs, id, &it)) {
if (h->id == id && htlc_has(h, HTLC_FLAG(owner,HTLC_F_OWNER)))
return h;
}
return NULL;
}
static inline size_t htlc_map_count(const struct htlc_map *htlcs)
{
return htlcs->raw.elems;
}
/* FIXME: Move these out of the hash! */
static inline bool htlc_is_dead(const struct htlc *htlc)
{
return htlc->state == RCVD_REMOVE_ACK_REVOCATION
|| htlc->state == SENT_REMOVE_ACK_REVOCATION;
}
#endif /* LIGHTNING_DAEMON_HTLC_H */