res_odbc: Use negative connection cache for all connections

Apply the negative connection cache setting to all connections,
even those that are not pooled. This ensures that the connection
will not be  re-established before the negative connection cache
time is met.

ASTERISK-22708 #close

Change-Id: I431cc2e8584ab0b6908b3523d0a0e18c9a527271

res/res_odbc.c

@@ -1253,8 +1253,7 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
 		if (obj) {
 			ast_assert(ao2_ref(obj, 0) > 1);
 		}
-		if (!obj && (ast_atomic_fetchadd_int(&class->count, +1) < class->limit) &&
-				(time(NULL) > class->last_negative_connect.tv_sec + class->negative_connection_cache.tv_sec)) {
+		if (!obj && (ast_atomic_fetchadd_int(&class->count, +1) < class->limit)) {
 			obj = ao2_alloc(sizeof(*obj), odbc_obj_destructor);
 			if (!obj) {
 				class->count--;
@@ -1412,10 +1411,7 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
 	}
 
 	if (ast_test_flag(&flags, RES_ODBC_CONNECTED) && !obj->up) {
-		/* Check if this connection qualifies for reconnection, with negative connection cache time */
-		if (time(NULL) > obj->parent->last_negative_connect.tv_sec + obj->parent->negative_connection_cache.tv_sec) {
-			odbc_obj_connect(obj);
-		}
+		odbc_obj_connect(obj);
 	} else if (ast_test_flag(&flags, RES_ODBC_SANITY_CHECK)) {
 		ast_odbc_sanity_check(obj);
 	} else if (obj->parent->idlecheck > 0 && ast_tvdiff_sec(ast_tvnow(), obj->last_used) > obj->parent->idlecheck) {
@@ -1522,6 +1518,7 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj)
 	char *tracefile = "/tmp/odbc.trace";
 #endif
 	SQLHDBC con;
+	long int negative_cache_expiration;
 
 	if (obj->up) {
 		odbc_obj_disconnect(obj);
@@ -1531,6 +1528,13 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj)
 		ast_log(LOG_NOTICE, "Connecting %s\n", obj->parent->name);
 	}
 
+	/* Dont connect while server is marked as unreachable via negative_connection_cache */
+	negative_cache_expiration = obj->parent->last_negative_connect.tv_sec + obj->parent->negative_connection_cache.tv_sec;
+	if (time(NULL) < negative_cache_expiration) {
+		ast_log(LOG_WARNING, "Not connecting to %s. Negative connection cache for %ld seconds\n", obj->parent->name, negative_cache_expiration - time(NULL));
+		return ODBC_FAIL;
+	}
+
 	res = SQLAllocHandle(SQL_HANDLE_DBC, obj->parent->env, &con);
 
 	if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {