web_server: Return early if no clients connected (#6467)

esphome/components/web_server/list_entities.cpp

@@ -12,6 +12,8 @@ ListEntitiesIterator::ListEntitiesIterator(WebServer *web_server) : web_server_(
 
 #ifdef USE_BINARY_SENSOR
 bool ListEntitiesIterator::on_binary_sensor(binary_sensor::BinarySensor *binary_sensor) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(
       this->web_server_->binary_sensor_json(binary_sensor, binary_sensor->state, DETAIL_ALL).c_str(), "state");
   return true;
@@ -19,30 +21,40 @@ bool ListEntitiesIterator::on_binary_sensor(binary_sensor::BinarySensor *binary_
 #endif
 #ifdef USE_COVER
 bool ListEntitiesIterator::on_cover(cover::Cover *cover) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->cover_json(cover, DETAIL_ALL).c_str(), "state");
   return true;
 }
 #endif
 #ifdef USE_FAN
 bool ListEntitiesIterator::on_fan(fan::Fan *fan) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->fan_json(fan, DETAIL_ALL).c_str(), "state");
   return true;
 }
 #endif
 #ifdef USE_LIGHT
 bool ListEntitiesIterator::on_light(light::LightState *light) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->light_json(light, DETAIL_ALL).c_str(), "state");
   return true;
 }
 #endif
 #ifdef USE_SENSOR
 bool ListEntitiesIterator::on_sensor(sensor::Sensor *sensor) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->sensor_json(sensor, sensor->state, DETAIL_ALL).c_str(), "state");
   return true;
 }
 #endif
 #ifdef USE_SWITCH
 bool ListEntitiesIterator::on_switch(switch_::Switch *a_switch) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->switch_json(a_switch, a_switch->state, DETAIL_ALL).c_str(),
                                   "state");
   return true;
@@ -50,12 +62,16 @@ bool ListEntitiesIterator::on_switch(switch_::Switch *a_switch) {
 #endif
 #ifdef USE_BUTTON
 bool ListEntitiesIterator::on_button(button::Button *button) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->button_json(button, DETAIL_ALL).c_str(), "state");
   return true;
 }
 #endif
 #ifdef USE_TEXT_SENSOR
 bool ListEntitiesIterator::on_text_sensor(text_sensor::TextSensor *text_sensor) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(
       this->web_server_->text_sensor_json(text_sensor, text_sensor->state, DETAIL_ALL).c_str(), "state");
   return true;
@@ -63,6 +79,8 @@ bool ListEntitiesIterator::on_text_sensor(text_sensor::TextSensor *text_sensor)
 #endif
 #ifdef USE_LOCK
 bool ListEntitiesIterator::on_lock(lock::Lock *a_lock) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->lock_json(a_lock, a_lock->state, DETAIL_ALL).c_str(), "state");
   return true;
 }
@@ -70,6 +88,8 @@ bool ListEntitiesIterator::on_lock(lock::Lock *a_lock) {
 
 #ifdef USE_CLIMATE
 bool ListEntitiesIterator::on_climate(climate::Climate *climate) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->climate_json(climate, DETAIL_ALL).c_str(), "state");
   return true;
 }
@@ -77,6 +97,8 @@ bool ListEntitiesIterator::on_climate(climate::Climate *climate) {
 
 #ifdef USE_NUMBER
 bool ListEntitiesIterator::on_number(number::Number *number) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->number_json(number, number->state, DETAIL_ALL).c_str(), "state");
   return true;
 }
@@ -84,6 +106,8 @@ bool ListEntitiesIterator::on_number(number::Number *number) {
 
 #ifdef USE_DATETIME_DATE
 bool ListEntitiesIterator::on_date(datetime::DateEntity *date) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->date_json(date, DETAIL_ALL).c_str(), "state");
   return true;
 }
@@ -91,6 +115,8 @@ bool ListEntitiesIterator::on_date(datetime::DateEntity *date) {
 
 #ifdef USE_TEXT
 bool ListEntitiesIterator::on_text(text::Text *text) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->text_json(text, text->state, DETAIL_ALL).c_str(), "state");
   return true;
 }
@@ -98,6 +124,8 @@ bool ListEntitiesIterator::on_text(text::Text *text) {
 
 #ifdef USE_SELECT
 bool ListEntitiesIterator::on_select(select::Select *select) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(this->web_server_->select_json(select, select->state, DETAIL_ALL).c_str(), "state");
   return true;
 }
@@ -105,6 +133,8 @@ bool ListEntitiesIterator::on_select(select::Select *select) {
 
 #ifdef USE_ALARM_CONTROL_PANEL
 bool ListEntitiesIterator::on_alarm_control_panel(alarm_control_panel::AlarmControlPanel *a_alarm_control_panel) {
+  if (this->web_server_->events_.count() == 0)
+    return true;
   this->web_server_->events_.send(
       this->web_server_->alarm_control_panel_json(a_alarm_control_panel, a_alarm_control_panel->get_state(), DETAIL_ALL)
           .c_str(),