feat(esp_http_server): Make HTTP(S)_SERVER_EVENT events optional

Make it possible to disable http(s) server events. This improves
performance of the server, as http server creates events on every signle
read or write to the socket.

Author: jimmyw

components/esp_http_server/Kconfig

@@ -57,8 +57,16 @@ menu "HTTP Server"
             It internally uses a counting semaphore with count set to `LWIP_UDP_RECVMBOX_SIZE` to achieve this.
             This config will slightly change API behavior to block until message gets delivered on control socket.
 
+    config HTTPD_ENABLE_EVENTS
+        bool "Enable ESP_HTTP_SERVER_EVENT"
+        default y
+        help
+            This enables the ESP_HTTP_SERVER_EVENT event type. Generating these eventes adds some overhead.
+            If you are not using this event type, you can disable it to save some memory and add performance.
+
     config HTTPD_SERVER_EVENT_POST_TIMEOUT
         int "Time in millisecond to wait for posting event"
+        depends on HTTPD_ENABLE_EVENTS
         default 2000
         help
             This config option helps in setting the time in millisecond to wait for event to be posted to the

components/esp_http_server/include/esp_http_server.h

@@ -23,8 +23,6 @@ extern "C" {
 
 #define ESP_HTTPD_DEF_CTRL_PORT         (32768)    /*!< HTTP Server control socket port*/
 
-ESP_EVENT_DECLARE_BASE(ESP_HTTP_SERVER_EVENT);
-
 /**
  * @brief   HTTP Server events id
  */
@@ -40,11 +38,15 @@ typedef enum {
     HTTP_SERVER_EVENT_STOP,            /*!< This event occurs when HTTP Server is stopped */
 } esp_http_server_event_id_t;
 
+#if CONFIG_HTTPD_ENABLE_EVENTS || __DOXYGEN_
+ESP_EVENT_DECLARE_BASE(ESP_HTTP_SERVER_EVENT);
+
 /** Argument structure for HTTP_SERVER_EVENT_ON_DATA and HTTP_SERVER_EVENT_SENT_DATA event */
 typedef struct {
     int fd;         /*!< Session socket file descriptor */
     int data_len;   /*!< Data length */
 } esp_http_server_event_data;
+#endif // CONFIG_HTTPD_ENABLE_EVENTS || __DOXYGEN_
 
 /*
 note: esp_https_server.h includes a customized copy of this

components/esp_http_server/src/esp_httpd_priv.h

@@ -17,6 +17,7 @@
 
 #include <esp_http_server.h>
 #include "osal.h"
+#include "sdkconfig.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -587,12 +588,18 @@ esp_err_t httpd_sess_trigger_close_(httpd_handle_t handle, struct sock_db *sessi
 #define ESP_HTTP_SERVER_EVENT_POST_TIMEOUT pdMS_TO_TICKS(CONFIG_HTTPD_SERVER_EVENT_POST_TIMEOUT)
 #endif
 
+#ifdef CONFIG_HTTPD_ENABLE_EVENTS
 /**
  * @brief Function to dispatch events in default event loop
  *
  */
 void esp_http_server_dispatch_event(int32_t event_id, const void* event_data, size_t event_data_size);
 
+#else // CONFIG_HTTPD_ENABLE_EVENTS
+#define esp_http_server_dispatch_event(event_id, event_data, event_data_size) do {} while(0)
+#endif // CONFIG_HTTPD_ENABLE_EVENTS
+
+
 #ifdef __cplusplus
 }
 #endif

components/esp_http_server/src/httpd_main.c

@@ -38,6 +38,7 @@ typedef struct {
 
 static const char *TAG = "httpd";
 
+#ifdef CONFIG_HTTPD_ENABLE_EVENTS
 ESP_EVENT_DEFINE_BASE(ESP_HTTP_SERVER_EVENT);
 
 void esp_http_server_dispatch_event(int32_t event_id, const void* event_data, size_t event_data_size)
@@ -47,6 +48,7 @@ void esp_http_server_dispatch_event(int32_t event_id, const void* event_data, si
         ESP_LOGE(TAG, "Failed to post esp_http_server event: %s", esp_err_to_name(err));
     }
 }
+#endif // CONFIG_HTTPD_ENABLE_EVENTS
 
 static esp_err_t httpd_accept_conn(struct httpd_data *hd, int listen_fd)
 {

components/esp_http_server/src/httpd_txrx.c

@@ -312,12 +312,14 @@ esp_err_t httpd_resp_send(httpd_req_t *r, const char *buf, ssize_t buf_len)
             return ESP_ERR_HTTPD_RESP_SEND;
         }
     }
+    hd->http_server_state = HTTP_SERVER_EVENT_SENT_DATA;
+#ifdef CONFIG_HTTPD_ENABLE_EVENTS
     esp_http_server_event_data evt_data = {
         .fd = ra->sd->fd,
         .data_len = buf_len,
     };
-    hd->http_server_state = HTTP_SERVER_EVENT_SENT_DATA;
     esp_http_server_dispatch_event(HTTP_SERVER_EVENT_SENT_DATA, &evt_data, sizeof(esp_http_server_event_data));
+#endif // CONFIG_HTTPD_ENABLE_EVENTS
     return ESP_OK;
 }
 
@@ -412,12 +414,14 @@ esp_err_t httpd_resp_send_chunk(httpd_req_t *r, const char *buf, ssize_t buf_len
     if (httpd_send_all(r, "\r\n", strlen("\r\n")) != ESP_OK) {
         return ESP_ERR_HTTPD_RESP_SEND;
     }
+    hd->http_server_state = HTTP_SERVER_EVENT_SENT_DATA;
+#ifdef CONFIG_HTTPD_ENABLE_EVENTS
     esp_http_server_event_data evt_data = {
         .fd = ra->sd->fd,
         .data_len = buf_len,
     };
-    hd->http_server_state = HTTP_SERVER_EVENT_SENT_DATA;
     esp_http_server_dispatch_event(HTTP_SERVER_EVENT_SENT_DATA, &evt_data, sizeof(esp_http_server_event_data));
+#endif // CONFIG_HTTPD_ENABLE_EVENTS
 
     return ESP_OK;
 }
@@ -628,11 +632,13 @@ int httpd_req_recv(httpd_req_t *r, char *buf, size_t buf_len)
     ESP_LOGD(TAG, LOG_FMT("received length = %d"), ret);
     struct httpd_data *hd = (struct httpd_data *) r->handle;
     hd->http_server_state = HTTP_SERVER_EVENT_ON_DATA;
+#ifdef CONFIG_HTTPD_ENABLE_EVENTS
     esp_http_server_event_data evt_data = {
         .fd = ra->sd->fd,
         .data_len = ret,
     };
     esp_http_server_dispatch_event(HTTP_SERVER_EVENT_ON_DATA, &evt_data, sizeof(esp_http_server_event_data));
+#endif // CONFIG_HTTPD_ENABLE_EVENTS
     return ret;
 }
 

components/esp_https_server/Kconfig

@@ -6,8 +6,18 @@ menu "ESP HTTPS server"
         help
             Enable ESP HTTPS server component
 
+    config ESP_HTTPS_SERVER_EVENTS
+        bool "Enable ESP_HTTPS_SERVER_EVENT event type"
+        depends on ESP_HTTPS_SERVER_ENABLE
+        default y
+        help
+            This enables the ESP_HTTPS_SERVER_EVENT event type. Generating these eventes adds some overhead.
+            If you are not using this event type, you can disable it to save some memory.
+
+
     config ESP_HTTPS_SERVER_EVENT_POST_TIMEOUT
         int "Time in millisecond to wait for posting event"
+        depends on (ESP_HTTPS_SERVER_ENABLE && ESP_HTTPS_SERVER_EVENTS)
         default 2000
         help
             This config option helps in setting the time in millisecond to wait for event to be posted to the

components/esp_https_server/include/esp_https_server.h

@@ -18,6 +18,7 @@
 extern "C" {
 #endif
 
+#if CONFIG_ESP_HTTPS_SERVER_EVENTS || __DOXYGEN__
 ESP_EVENT_DECLARE_BASE(ESP_HTTPS_SERVER_EVENT);
 
 typedef enum {
@@ -29,6 +30,7 @@ typedef enum {
     HTTPS_SERVER_EVENT_DISCONNECTED,    /*!< The connection has been disconnected */
     HTTPS_SERVER_EVENT_STOP,            /*!< This event occurs when HTTPS Server is stopped */
 } esp_https_server_event_id_t;
+#endif // CONFIG_ESP_HTTPS_SERVER_EVENTS || __DOXYGEN__
 
 typedef enum {
     HTTPD_SSL_TRANSPORT_SECURE,      // SSL Enabled

components/esp_https_server/src/https_server.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2018-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -23,7 +23,9 @@ typedef struct httpd_ssl_transport_ctx {
     httpd_ssl_ctx_t *global_ctx;
 } httpd_ssl_transport_ctx_t;
 
+#ifdef CONFIG_ESP_HTTPS_SERVER_EVENTS
 ESP_EVENT_DEFINE_BASE(ESP_HTTPS_SERVER_EVENT);
+#endif
 
 #if CONFIG_ESP_HTTPS_SERVER_EVENT_POST_TIMEOUT == -1
 #define ESP_HTTPS_SERVER_EVENT_POST_TIMEOUT portMAX_DELAY
@@ -32,13 +34,17 @@ ESP_EVENT_DEFINE_BASE(ESP_HTTPS_SERVER_EVENT);
 #endif
 
 
+#ifdef CONFIG_ESP_HTTPS_SERVER_EVENTS
 static void http_dispatch_event_to_event_loop(int32_t event_id, const void* event_data, size_t event_data_size)
 {
     esp_err_t err = esp_event_post(ESP_HTTPS_SERVER_EVENT, event_id, event_data, event_data_size, ESP_HTTPS_SERVER_EVENT_POST_TIMEOUT);
     if (err != ESP_OK) {
         ESP_LOGE(TAG, "Failed to post http_client event: %"PRId32", error: %s", event_id, esp_err_to_name(err));
     }
 }
+#else // CONFIG_ESP_HTTPS_SERVER_EVENTS
+#define http_dispatch_event_to_event_loop(event_id, event_data, event_data_size) do {} while (0)
+#endif // CONFIG_ESP_HTTPS_SERVER_EVENTS
 
 /**
  * SSL socket close handler

examples/protocols/https_server/simple/main/main.c

@@ -31,6 +31,7 @@
 
 static const char *TAG = "example";
 
+#ifdef CONFIG_ESP_HTTPS_SERVER_EVENTS
 /* Event handler for catching system events */
 static void event_handler(void* arg, esp_event_base_t event_base,
                           int32_t event_id, void* event_data)
@@ -42,6 +43,7 @@ static void event_handler(void* arg, esp_event_base_t event_base,
         }
     }
 }
+#endif // CONFIG_ESP_HTTPS_SERVER_EVENTS
 
 /* An HTTP GET handler */
 static esp_err_t root_get_handler(httpd_req_t *req)
@@ -247,7 +249,9 @@ void app_main(void)
     ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &connect_handler, &server));
     ESP_ERROR_CHECK(esp_event_handler_register(ETH_EVENT, ETHERNET_EVENT_DISCONNECTED, &disconnect_handler, &server));
 #endif // CONFIG_EXAMPLE_CONNECT_ETHERNET
+#ifdef CONFIG_ESP_HTTPS_SERVER_EVENTS
     ESP_ERROR_CHECK(esp_event_handler_register(ESP_HTTPS_SERVER_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
+#endif // CONFIG_ESP_HTTPS_SERVER_EVENTS
 
     /* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
      * Read "Establishing Wi-Fi or Ethernet Connection" section in