wallet: Adding primitives to save/load invoices to wallet

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

wallet/wallet.c

@@ -1096,12 +1096,99 @@ bool wallet_htlcs_reconnect(struct wallet *wallet,
 		if (!hout->in) {
 			log_broken(
 			    wallet->log,
-			    "Unable to find corresponding htlc_in %" PRIu64
-			    " for htlc_out %" PRIu64,
+			    "Unable to find corresponding htlc_in %"PRIu64" for htlc_out %"PRIu64,
 			    hout->origin_htlc_id, hout->dbid);
+		}
+
+	}
+	return true;
+}
+
+bool wallet_invoice_save(struct wallet *wallet, struct invoice *inv)
+{
+	/* Need to use the lower level API of sqlite3 to bind
+	 * label. Otherwise we'd need to implement sanitization of
+	 * that string for sql injections... */
+	sqlite3_stmt *stmt;
+	if (!inv->id) {
+		stmt = db_prepare(wallet->db,
+			"INSERT INTO invoices (payment_hash, payment_key, state, msatoshi, label) VALUES (?, ?, ?, ?, ?);");
+		if (!stmt) {
+			log_broken(wallet->log, "Could not prepare statement: %s", wallet->db->err);
+			return false;
+		}
+
+		sqlite3_bind_blob(stmt, 1, &inv->rhash, sizeof(inv->rhash), SQLITE_TRANSIENT);
+		sqlite3_bind_blob(stmt, 2, &inv->r, sizeof(inv->r), SQLITE_TRANSIENT);
+		sqlite3_bind_int(stmt, 3, inv->state);
+		sqlite3_bind_int64(stmt, 4, inv->msatoshi);
+		sqlite3_bind_text(stmt, 5, inv->label, strlen(inv->label), SQLITE_TRANSIENT);
+
+		if (!db_exec_prepared(wallet->db, stmt)) {
+			log_broken(wallet->log, "Could not exec prepared statement: %s", wallet->db->err);
+			return false;
+		}
+
+		inv->id = sqlite3_last_insert_rowid(wallet->db->sql);
+		return true;
+	} else {
+		stmt = db_prepare(wallet->db, "UPDATE invoices SET state=? WHERE id=?;");
+
+		if (!stmt) {
+			log_broken(wallet->log, "Could not prepare statement: %s", wallet->db->err);
+			return false;
+		}
+
+		sqlite3_bind_int(stmt, 1, inv->state);
+		sqlite3_bind_int64(stmt, 2, inv->id);
+
+		if (!db_exec_prepared(wallet->db, stmt)) {
+			log_broken(wallet->log, "Could not exec prepared statement: %s", wallet->db->err);
 			return false;
+		} else {
+			return true;
 		}
+	}
+}
+
+static bool wallet_stmt2invoice(sqlite3_stmt *stmt, struct invoice *inv)
+{
+	inv->id = sqlite3_column_int64(stmt, 0);
+	inv->state = sqlite3_column_int(stmt, 1);
+
+	assert(sqlite3_column_bytes(stmt, 2) == sizeof(struct preimage));
+	memcpy(&inv->r, sqlite3_column_blob(stmt, 2), sqlite3_column_bytes(stmt, 2));
 
+	assert(sqlite3_column_bytes(stmt, 3) == sizeof(struct sha256));
+	memcpy(&inv->rhash, sqlite3_column_blob(stmt, 3), sqlite3_column_bytes(stmt, 3));
+
+	inv->label = tal_strndup(inv, sqlite3_column_blob(stmt, 4), sqlite3_column_bytes(stmt, 4));
+	inv->msatoshi = sqlite3_column_int64(stmt, 5);
+	return true;
+}
+
+bool wallet_invoices_load(struct wallet *wallet, struct invoices *invs)
+{
+	struct invoice *i;
+	int count = 0;
+	sqlite3_stmt *stmt = db_query(__func__, wallet->db,
+				"SELECT id, state, payment_key, payment_hash, "
+				"label, msatoshi FROM invoices;");
+	if (!stmt) {
+		log_broken(wallet->log, "Could not load invoices: %s", wallet->db->err);
+		return false;
+	}
+
+	while (sqlite3_step(stmt) == SQLITE_ROW) {
+		i = tal(invs, struct invoice);
+		if (!wallet_stmt2invoice(stmt, i)) {
+			log_broken(wallet->log, "Error deserializing invoice");
+			return false;
+		}
+		invoice_add(invs, i);
+		count++;
 	}
+
+	log_debug(wallet->log, "Loaded %d invoices from DB", count);
 	return true;
 }

wallet/wallet.h

@@ -10,6 +10,7 @@
 #include <common/channel_config.h>
 #include <common/utxo.h>
 #include <lightningd/htlc_end.h>
+#include <lightningd/invoice.h>
 #include <wally_bip32.h>
 
 struct lightningd;
@@ -300,4 +301,26 @@ bool wallet_htlcs_reconnect(struct wallet *wallet,
 			    struct htlc_in_map *htlcs_in,
 			    struct htlc_out_map *htlcs_out);
 
+/**
+ * wallet_invoice_save -- Save/update an invoice to the wallet
+ *
+ * Save or update the invoice in the wallet. If `inv->id` is 0 this
+ * invoice will be considered a new invoice and result in an intert
+ * into the database, otherwise it'll be updated.
+ *
+ * @wallet: Wallet to store in
+ * @inv: Invoice to save
+ */
+bool wallet_invoice_save(struct wallet *wallet, struct invoice *inv);
+
+/**
+ * wallet_invoices_load -- Load all invoices into memory
+ *
+ * Load all invoices into the given `invoices` struct.
+ *
+ * @wallet: Wallet to load invoices from
+ * @invs: invoices container to load into
+ */
+bool wallet_invoices_load(struct wallet *wallet, struct invoices *invs);
+
 #endif /* WALLET_WALLET_H */

wallet/wallet_tests.c

@@ -8,6 +8,9 @@
 #include <unistd.h>
 #include <wallet/test_utils.h>
 
+void invoice_add(struct invoices *invs,
+		 struct invoice *inv){}
+
 static struct wallet *create_test_wallet(const tal_t *ctx)
 {
 	char filename[] = "/tmp/ldb-XXXXXX";