wallet: Add outpointfilter for the utxoset

Signed-off-by: Christian Decker <decker.christian@gmail.com>

wallet/wallet.c

@@ -18,13 +18,27 @@
 
 static void outpointfilters_init(struct wallet *w)
 {
+	sqlite3_stmt *stmt;
 	struct utxo **utxos = wallet_get_utxos(NULL, w, output_state_any);
+	struct bitcoin_txid txid;
+	u32 outnum;
 
 	w->owned_outpoints = outpointfilter_new(w);
 	for (size_t i = 0; i < tal_count(utxos); i++)
 		outpointfilter_add(w->owned_outpoints, &utxos[i]->txid, utxos[i]->outnum);
 
 	tal_free(utxos);
+
+	w->utxoset_outpoints = outpointfilter_new(w);
+	stmt = db_prepare(w->db, "SELECT txid, outnum FROM utxoset WHERE spendheight is NULL");
+
+	while (sqlite3_step(stmt) == SQLITE_ROW) {
+		sqlite3_column_sha256_double(stmt, 0, &txid.shad);
+		outnum = sqlite3_column_int(stmt, 1);
+		outpointfilter_add(w->utxoset_outpoints, &txid, outnum);
+	}
+
+	sqlite3_finalize(stmt);
 }
 
 struct wallet *wallet_new(struct lightningd *ld,

wallet/wallet.h

@@ -36,6 +36,10 @@ struct wallet {
 	/* Filter matching all outpoints corresponding to our owned outputs,
 	 * including all spent ones */
 	struct outpointfilter *owned_outpoints;
+
+	/* Filter matching all outpoints that might be a funding transaction on
+	 * the blockchain. This is currently all P2WSH outputs */
+	struct outpointfilter *utxoset_outpoints;
 };
 
 /* Possible states for tracked outputs in the database. Not sure yet