rspro_client_fsm: Add optional notifiation of parent on connect/disconnect

This will be useful once we introduce a 'main' client FSM that is a
parent to the rspro_client_fsms.

Change-Id: Ifddb8e0b5c991e5348392c9e44612669ce207bc4

src/rspro_client_fsm.c

@@ -244,6 +244,14 @@ static void srvc_st_established(struct osmo_fsm_inst *fi, uint32_t event, void *
 	}
 }
 
+static void srvc_st_connected_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct rspro_server_conn *srvc = (struct rspro_server_conn *) fi->priv;
+
+	if (fi->proc.parent)
+		osmo_fsm_inst_dispatch(fi->proc.parent, srvc->parent_conn_evt, NULL);
+}
+
 static void srvc_st_connected(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct rspro_server_conn *srvc = (struct rspro_server_conn *) fi->priv;
@@ -263,6 +271,14 @@ static void srvc_st_connected(struct osmo_fsm_inst *fi, uint32_t event, void *da
 	}
 }
 
+static void srvc_st_connected_onleave(struct osmo_fsm_inst *fi, uint32_t next_state)
+{
+	struct rspro_server_conn *srvc = (struct rspro_server_conn *) fi->priv;
+
+	if (fi->proc.parent)
+		osmo_fsm_inst_dispatch(fi->proc.parent, srvc->parent_disc_evt, NULL);
+}
+
 static int ipa_kaepalive_timeout_cb(struct osmo_fsm_inst *ka_fi, void *conn)
 {
 	struct osmo_fsm_inst *fi = ka_fi->proc.parent;
@@ -396,6 +412,8 @@ static const struct osmo_fsm_state server_conn_fsm_states[] = {
 		.in_event_mask = S(SRVC_E_TCP_DOWN) | S(SRVC_E_KA_TIMEOUT) | S(SRVC_E_RSPRO_TX),
 		.out_state_mask = S(SRVC_ST_REESTABLISH) | S(SRVC_ST_INIT),
 		.action = srvc_st_connected,
+		.onenter = srvc_st_connected_onenter,
+		.onleave = srvc_st_connected_onleave,
 	},
 	[SRVC_ST_REESTABLISH] = {
 		.name = "REESTABLISH",

src/rspro_client_fsm.h

@@ -41,6 +41,10 @@ struct rspro_server_conn {
 	char *server_host;
 	uint16_t server_port;
 
+	/* FSM events we are to sent to the parent FSM on connect / disconnect */
+	uint32_t parent_conn_evt;
+	uint32_t parent_disc_evt;
+
 	/* only in case we are representing a bankd client */
 	struct {
 		uint16_t bank_id;