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chaintopology: get_last_mediantime()

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This gets the median time of the block the tx is in.  If there is more
than one (different tips), it gets the last median time.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2016-04-24 19:46:32 +09:30
parent e09795d24e
commit 6e39b0a642
2 changed files with 42 additions and 3 deletions
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38
daemon/chaintopology.c
View File

@@ -62,6 +62,7 @@ static bool block_eq(const struct block *b, const struct sha256_double *key)
HTABLE_DEFINE_TYPE(struct block, keyof_block_map, hash_sha, block_eq, block_map);
struct topology {
struct block *root;
struct block **tips;
struct sha256_double *newtips;
struct block_map block_map;
@@ -429,10 +430,10 @@ static void init_topo(struct lightningd_state *dstate,
struct bitcoin_block *blk,
ptrint_t *p)
{
struct block *b;
struct topology *topo = dstate->topology;
b = add_block(dstate, blk);
b->height = ptr2int(p);
topo->root = add_block(dstate, blk);
topo->root->height = ptr2int(p);
/* Now grab chaintips immediately. */
bitcoind_get_chaintips(dstate, check_chaintips, NULL);
@@ -459,6 +460,37 @@ static void get_init_blockhash(struct lightningd_state *dstate, u32 blockcount,
bitcoind_getblockhash(dstate, start, get_init_block, int2ptr(start));
}
/* FIXME: Don't brute force this for the normal case! */
static void last_mediantime(const struct block *b,
const struct txwatch *w,
u32 *mediantime)
{
size_t i;
if (tx_in_block(b, w)) {
if (b->mediantime > *mediantime)
*mediantime = b->mediantime;
/* Can't be in a later block */
return;
}
for (i = 0; i < tal_count(b->nexts); i++)
last_mediantime(b->nexts[i], w, mediantime);
}
u32 get_last_mediantime(struct lightningd_state *dstate,
const struct sha256_double *txid)
{
struct topology *topo = dstate->topology;
struct txwatch *w;
u32 mediantime = 0;
w = txwatch_hash_get(&dstate->txwatches, txid);
last_mediantime(topo->root, w, &mediantime);
return mediantime;
}
void setup_topology(struct lightningd_state *dstate)
{
dstate->topology = tal(dstate, struct topology);

7
daemon/chaintopology.h
View File

@@ -6,8 +6,15 @@
struct lightningd_state;
struct txwatch;
/* This is the number of blocks which would have to be mined to invalidate
* the tx. */
size_t get_tx_depth(struct lightningd_state *dstate, const struct txwatch *w,
struct sha256_double *blkid);
/* This is the worst-case (latest) mediantime of blocks including the txid.
* Assumes the depth is > 0! */
u32 get_last_mediantime(struct lightningd_state *dstate,
const struct sha256_double *txid);
void setup_topology(struct lightningd_state *dstate);
#endif /* LIGHTNING_DAEMON_CRYPTOPKT_H */