db: Add timestamp primitives so we can store them in the DB

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

wallet/db.c

@@ -11,6 +11,7 @@
 #include <lightningd/plugin_hook.h>
 
 #define DB_FILE "lightningd.sqlite3"
+#define NSEC_IN_SEC 1000000000
 
 /* For testing, we want to catch fatal messages. */
 #ifndef db_fatal
@@ -1155,3 +1156,19 @@ void migrate_pr2342_feerate_per_channel(struct lightningd *ld, struct db *db)
 			ld->config.fee_base,
 			ld->config.fee_per_satoshi);
 }
+
+void sqlite3_bind_timeabs(sqlite3_stmt *stmt, int col, struct timeabs t)
+{
+	u64 timestamp =  t.ts.tv_nsec + (t.ts.tv_sec * NSEC_IN_SEC);
+	sqlite3_bind_int64(stmt, col, timestamp);
+}
+
+struct timeabs sqlite3_column_timeabs(sqlite3_stmt *stmt, int col)
+{
+	struct timeabs t;
+	u64 timestamp = sqlite3_column_int64(stmt, col);
+	t.ts.tv_sec = timestamp / NSEC_IN_SEC;
+	t.ts.tv_nsec = timestamp % NSEC_IN_SEC;
+	return t;
+
+}

wallet/db.h

@@ -8,6 +8,7 @@
 #include <bitcoin/tx.h>
 #include <ccan/short_types/short_types.h>
 #include <ccan/tal/tal.h>
+#include <ccan/time/time.h>
 #include <common/amount.h>
 #include <secp256k1_ecdh.h>
 #include <sqlite3.h>
@@ -212,4 +213,9 @@ void sqlite3_bind_amount_msat(sqlite3_stmt *stmt, int col,
 			      struct amount_msat msat);
 void sqlite3_bind_amount_sat(sqlite3_stmt *stmt, int col,
 			     struct amount_sat sat);
+
+/* Helpers to read and write absolute times from and to the database. */
+void sqlite3_bind_timeabs(sqlite3_stmt *stmt, int col, struct timeabs t);
+struct timeabs sqlite3_column_timeabs(sqlite3_stmt *stmt, int col);
+
 #endif /* LIGHTNING_WALLET_DB_H */