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db: Make peers unique by node_id 

We should only ever have a single entry for each node_id, enforcing
this on the DB.
This commit is contained in:
Christian Decker 2017-08-14 16:04:11 +02:00 committed by Rusty Russell
parent 4bc0750882
commit 1a94e7282b
4 changed files with 42 additions and 2 deletions
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7
lightningd/peer_control.c
View File

@ -540,7 +540,7 @@ static struct wallet_channel *peer_channel_new(struct wallet *w,
struct wallet_channel *wc = tal(peer, struct wallet_channel);
wc->peer = peer;
/* TODO(cdecker) See if we already stored this peer in the DB and load if yes */
wallet_peer_by_nodeid(w, &peer->id, peer);
wc->id = 0;
if (!wallet_channel_save(w, wc)) {
@ -590,6 +590,11 @@ void add_peer(struct lightningd *ld, u64 unique_id,
peer->htlcs = tal_arr(peer, struct htlc_stub, 0);
wallet_shachain_init(ld->wallet, &peer->their_shachain);
/* If we have the peer in the DB, this'll populate the fields,
* failure just indicates that the peer wasn't found in the
* DB */
wallet_peer_by_nodeid(ld->wallet, id, peer);
/* peer->channel gets populated as soon as we start opening a channel */
peer->channel = NULL;

2
wallet/db.c
View File

@ -79,7 +79,7 @@ char *dbmigrations[] = {
");",
"CREATE TABLE peers ("
" id INTEGER,"
" node_id BLOB," /* pubkey */
" node_id BLOB UNIQUE," /* pubkey */
" address TEXT,"
" PRIMARY KEY (id)"
");",

22
wallet/wallet.c
View File

@ -401,6 +401,28 @@ static bool wallet_peer_load(struct wallet *w, const u64 id, struct peer *peer)
return ok;
}
bool wallet_peer_by_nodeid(struct wallet *w, const struct pubkey *nodeid,
struct peer *peer)
{
bool ok;
tal_t *tmpctx = tal_tmpctx(w);
sqlite3_stmt *stmt = db_query(
__func__, w->db, "SELECT id, node_id FROM peers WHERE node_id='%s';",
pubkey_to_hexstr(tmpctx, nodeid));
ok = stmt != NULL && sqlite3_step(stmt) == SQLITE_ROW;
if (ok) {
peer->dbid = sqlite3_column_int64(stmt, 0);
ok &= sqlite3_column_pubkey(stmt, 1, &peer->id);
} else {
/* Make sure we mark this as a new peer */
peer->dbid = 0;
}
sqlite3_finalize(stmt);
tal_free(tmpctx);
return ok;
}
/**
* wallet_stmt2channel - Helper to populate a wallet_channel from a sqlite3_stmt
*

13
wallet/wallet.h
View File

@ -184,4 +184,17 @@ bool wallet_channel_config_save(struct wallet *w, struct channel_config *cc);
*/
bool wallet_channel_config_load(struct wallet *w, const u64 id,
struct channel_config *cc);
/**
* wallet_peer_by_nodeid -- Given a node_id/pubkey, load the peer from DB
*
* @w: the wallet to load from
* @nodeid: the node_id to search for
* @peer(out): the destination where to store the peer
*
* Returns true on success, or false if we were unable to find a peer
* with the given node_id.
*/
bool wallet_peer_by_nodeid(struct wallet *w, const struct pubkey *nodeid,
struct peer *peer);
#endif /* WALLET_WALLET_H */