Files
AI-on-the-edge-device/code/components/jomjol_helper/websocket.cpp
2023-05-03 21:46:59 +02:00

130 lines
3.7 KiB
C++

#include "esp_log.h"
#include <esp_http_server.h>
#include "../../include/defines.h"
#include "ClassLogFile.h"
#include "freertos/ringbuf.h"
#include "psram.h"
#include "websocket.h"
#define MAX_MESSAGE_LENGTH 100
static const char *TAG = "WEBSOCKET";
static httpd_handle_t server = NULL;
static httpd_handle_t websocket_handle = NULL;
/*
* Structure holding server handle and message
* in order to use out of request send */
struct async_resp_arg {
httpd_handle_t hd;
char message[MAX_MESSAGE_LENGTH];
};
/*
* async send function, which we put into the httpd work queue
*/
static void websocket_send_pending_message(void *arg) {
esp_err_t ret;
struct async_resp_arg *resp_arg = (struct async_resp_arg *)arg;
LogFile.WriteToFile(ESP_LOG_DEBUG, TAG, "Sending Websocket message: '" + std::string(resp_arg->message) + "'");
httpd_ws_frame_t ws_pkt;
memset(&ws_pkt, 0, sizeof(httpd_ws_frame_t));
ws_pkt.payload = (uint8_t *)resp_arg->message;
ws_pkt.len = strlen(resp_arg->message);
ws_pkt.type = HTTPD_WS_TYPE_TEXT;
static size_t max_clients = CONFIG_LWIP_MAX_LISTENING_TCP;
size_t fds = max_clients;
int client_fds[max_clients];
ret = httpd_get_client_list(server, &fds, client_fds);
if (ret != ESP_OK) {
LogFile.WriteToFile(ESP_LOG_ERROR, TAG, "Failed to get Websocket client ist: " + std::to_string(ret) + "!");
free_psram_heap("websocket msg", resp_arg);
return;
}
/* Send it to all websocket clients */
for (int i = 0; i < fds; i++) {
int client_info = httpd_ws_get_fd_info(server, client_fds[i]);
if (client_info == HTTPD_WS_CLIENT_WEBSOCKET) {
httpd_ws_send_frame_async(websocket_handle, client_fds[i], &ws_pkt);
}
}
free_psram_heap("websocket msg", resp_arg);
}
esp_err_t schedule_websocket_message(std::string message) {
// return 0;
esp_err_t ret;
if (websocket_handle == NULL) { // No websocket connecten open
return ESP_OK;
}
LogFile.WriteToFile(ESP_LOG_DEBUG, TAG, "Scheduled websocket message: '" + message + "'");
struct async_resp_arg *resp_arg = (struct async_resp_arg *)malloc_psram_heap("websocket msg",
sizeof(struct async_resp_arg), MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
if (resp_arg == NULL) {
LogFile.WriteToFile(ESP_LOG_ERROR, TAG, "Failed to malloc memory for scheduled websocket message!");
return ESP_ERR_NO_MEM;
}
strncpy(resp_arg->message, message.c_str(), MAX_MESSAGE_LENGTH);
ret = httpd_queue_work(websocket_handle, websocket_send_pending_message, resp_arg);
if (ret != ESP_OK) {
LogFile.WriteToFile(ESP_LOG_ERROR, TAG, "Websocket Scheduling failed: " + std::to_string(ret) + "!");
free_psram_heap("websocket msg", resp_arg);
}
return ret;
}
static esp_err_t ws_handler(httpd_req_t *req) {
if (req->method == HTTP_GET) {
LogFile.WriteToFile(ESP_LOG_DEBUG, TAG, "Handshake done, the new websocket connection was opened");
websocket_handle = req->handle;
}
return ESP_OK;
}
static const httpd_uri_t ws_uri = {
.uri = "/ws",
.method = HTTP_GET,
.handler = ws_handler,
.user_ctx = NULL,
.is_websocket = true
};
esp_err_t start_websocket_server(httpd_handle_t _server) {
esp_err_t ret;
LogFile.WriteToFile(ESP_LOG_DEBUG, TAG, "Init Websocket Server");
server = _server;
// Registering the ws handler
LogFile.WriteToFile(ESP_LOG_DEBUG, TAG, "Registering URI handler");
ret = httpd_register_uri_handler(server, &ws_uri);
if (ret != ESP_OK) {
LogFile.WriteToFile(ESP_LOG_ERROR, TAG, "Registering Websocket URI handler failed: " + std::to_string(ret));
}
return ret;
}