dont send ipc events when there are no listeners

1 files changed, 29 insertions, 2 deletions

diff --git a/sway/ipc-server.c b/sway/ipc-server.c
index df5fb699..5fe5c755 100644
--- a/sway/ipc-server.c
+++ b/sway/ipc-server.c
@@ -241,10 +241,25 @@ int ipc_client_handle_readable(int client_fd, uint32_t mask, void *data) {
         return 0;
 }
 
+static bool ipc_has_event_listeners(enum ipc_command_type event) {
+        bool has_listeners = false;
+
+        struct ipc_client *client;
+        for (int i = 0; i < ipc_client_list->length; i++) {
+                client = ipc_client_list->items[i];
+                if ((client->subscribed_events & event_mask(event)) == 0) {
+                        continue;
+                }
+                has_listeners = true;
+                break;
+        }
+
+        return has_listeners;
+}
+
 static void ipc_send_event(const char *json_string, enum ipc_command_type event) {
-        int i;
         struct ipc_client *client;
-        for (i = 0; i < ipc_client_list->length; i++) {
+        for (int i = 0; i < ipc_client_list->length; i++) {
                 client = ipc_client_list->items[i];
                 if ((client->subscribed_events & event_mask(event)) == 0) {
                         continue;
@@ -259,6 +274,9 @@ static void ipc_send_event(const char *json_string, enum ipc_command_type event)
 
 void ipc_event_workspace(struct sway_container *old,
                 struct sway_container *new, const char *change) {
+        if (!ipc_has_event_listeners(IPC_EVENT_WORKSPACE)) {
+                return;
+        }
         wlr_log(L_DEBUG, "Sending workspace::%s event", change);
         json_object *obj = json_object_new_object();
         json_object_object_add(obj, "change", json_object_new_string(change));
@@ -284,6 +302,9 @@ void ipc_event_workspace(struct sway_container *old,
 }
 
 void ipc_event_window(struct sway_container *window, const char *change) {
+        if (!ipc_has_event_listeners(IPC_EVENT_WINDOW)) {
+                return;
+        }
         wlr_log(L_DEBUG, "Sending window::%s event", change);
         json_object *obj = json_object_new_object();
         json_object_object_add(obj, "change", json_object_new_string(change));
@@ -295,6 +316,9 @@ void ipc_event_window(struct sway_container *window, const char *change) {
 }
 
 void ipc_event_barconfig_update(struct bar_config *bar) {
+        if (!ipc_has_event_listeners(IPC_EVENT_BARCONFIG_UPDATE)) {
+                return;
+        }
         wlr_log(L_DEBUG, "Sending barconfig_update event");
         json_object *json = ipc_json_describe_bar_config(bar);
 
@@ -304,6 +328,9 @@ void ipc_event_barconfig_update(struct bar_config *bar) {
 }
 
 void ipc_event_mode(const char *mode) {
+        if (!ipc_has_event_listeners(IPC_EVENT_MODE)) {
+                return;
+        }
         wlr_log(L_DEBUG, "Sending mode::%s event", mode);
         json_object *obj = json_object_new_object();
         json_object_object_add(obj, "change", json_object_new_string(mode));