Fix websocket crash

main/http_server/http_server.c

@@ -35,6 +35,7 @@ static const char * TAG = "http_server";
 
 static GlobalState * GLOBAL_STATE;
 static httpd_handle_t server = NULL;
+QueueHandle_t log_queue = NULL;
 
 static int fd = -1;
 
@@ -48,6 +49,7 @@ static int fd = -1;
 
 #define FILE_PATH_MAX (ESP_VFS_PATH_MAX + 128)
 #define SCRATCH_BUFSIZE (10240)
+#define MESSAGE_QUEUE_SIZE (128)
 
 typedef struct rest_server_context
 {
@@ -534,12 +536,8 @@ esp_err_t POST_OTA_update(httpd_req_t * req)
     return ESP_OK;
 }
 
-static pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-void log_to_websocket(const char * format, va_list args)
+void log_to_queue(const char * format, va_list args)
 {
-    pthread_mutex_lock(&log_mutex);
-
     va_list args_copy;
     va_copy(args_copy, args);
 
@@ -550,7 +548,6 @@ void log_to_websocket(const char * format, va_list args)
     // Allocate the buffer dynamically
     char * log_buffer = (char *) calloc(needed_size + 2, sizeof(char));  // +2 for potential \n and \0
     if (log_buffer == NULL) {
-        pthread_mutex_unlock(&log_mutex);
         return;
     }
 
@@ -567,16 +564,25 @@ void log_to_websocket(const char * format, va_list args)
         len++;
     }
 
+    // Print to standard output
+    printf("%s", log_buffer);
+
+	if (xQueueSendToBack(log_queue, (void*)&log_buffer, (TickType_t) 0) != pdPASS) {
+		if (log_buffer != NULL) {
+			free((void*)log_buffer);
+		}
+	}
+}
+
+void send_log_to_websocket(char *message)
+{
     // Prepare the WebSocket frame
     httpd_ws_frame_t ws_pkt;
     memset(&ws_pkt, 0, sizeof(httpd_ws_frame_t));
-    ws_pkt.payload = (uint8_t *) log_buffer;
-    ws_pkt.len = len;
+    ws_pkt.payload = (uint8_t *)message;
+    ws_pkt.len = strlen(message);
     ws_pkt.type = HTTPD_WS_TYPE_TEXT;
 
-    // Print to standard output
-    printf("%s", log_buffer);
-
     // Ensure server and fd are valid
     if (server != NULL && fd >= 0) {
         // Send the WebSocket frame asynchronously
@@ -586,9 +592,7 @@ void log_to_websocket(const char * format, va_list args)
     }
 
     // Free the allocated buffer
-    free(log_buffer);
-
-    pthread_mutex_unlock(&log_mutex);
+    free((void*)message);
 }
 
 /*
@@ -597,14 +601,12 @@ void log_to_websocket(const char * format, va_list args)
  */
 esp_err_t echo_handler(httpd_req_t * req)
 {
-
     if (req->method == HTTP_GET) {
         ESP_LOGI(TAG, "Handshake done, the new connection was opened");
         fd = httpd_req_to_sockfd(req);
-        esp_log_set_vprintf(log_to_websocket);
+        esp_log_set_vprintf(log_to_queue);
         return ESP_OK;
     }
-
     return ESP_OK;
 }
 
@@ -622,6 +624,29 @@ esp_err_t http_404_error_handler(httpd_req_t * req, httpd_err_code_t err)
     return ESP_OK;
 }
 
+void websocket_log_handler()
+{
+	while (true)
+	{
+		char *message;
+		if (xQueueReceive(log_queue, &message, (TickType_t) portMAX_DELAY) != pdPASS) {
+			if (message != NULL) {
+				free((void*)message);
+			}
+			vTaskDelay(10 / portTICK_PERIOD_MS);
+			continue;
+		}
+
+		if (fd == -1) {
+			free((void*)message);
+			vTaskDelay(100 / portTICK_PERIOD_MS);
+			continue;
+		}
+
+		send_log_to_websocket(message);
+	}
+}
+
 esp_err_t start_rest_server(void * pvParameters)
 {
     GLOBAL_STATE = (GlobalState *) pvParameters;
@@ -639,6 +664,8 @@ esp_err_t start_rest_server(void * pvParameters)
     REST_CHECK(rest_context, "No memory for rest context", err);
     strlcpy(rest_context->base_path, base_path, sizeof(rest_context->base_path));
 
+    log_queue = xQueueCreate(MESSAGE_QUEUE_SIZE, sizeof(char*));
+
     httpd_config_t config = HTTPD_DEFAULT_CONFIG();
     config.uri_match_fn = httpd_uri_match_wildcard;
     config.max_uri_handlers = 20;
@@ -711,8 +738,10 @@ esp_err_t start_rest_server(void * pvParameters)
 
     httpd_register_err_handler(server, HTTPD_404_NOT_FOUND, http_404_error_handler);
 
-    // Start the DNS server that will redirect all queries to the softAP IP
+    // Start websocket log handler thread
+    xTaskCreate(&websocket_log_handler, "websocket_log_handler", 4096, NULL, 2, NULL);
 
+    // Start the DNS server that will redirect all queries to the softAP IP
     dns_server_config_t dns_config = DNS_SERVER_CONFIG_SINGLE("*" /* all A queries */, "WIFI_AP_DEF" /* softAP netif ID */);
     start_dns_server(&dns_config);