242 lines
7.1 KiB
C
242 lines
7.1 KiB
C
/* Persistent Sockets Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <esp_wifi.h>
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#include <esp_event.h>
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#include <esp_log.h>
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#include <esp_system.h>
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#include <nvs_flash.h>
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#include "esp_netif.h"
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#include "esp_eth.h"
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#include "protocol_examples_common.h"
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#include <esp_http_server.h>
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/* An example to demonstrate persistent sockets, with context maintained across
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* multiple requests on that socket.
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*/
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static const char *TAG = "example";
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/* Function to free context */
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static void adder_free_func(void *ctx)
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{
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ESP_LOGI(TAG, "/adder Free Context function called");
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free(ctx);
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}
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/* This handler keeps accumulating data that is posted to it into a per
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* socket/session context. And returns the result.
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*/
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static esp_err_t adder_post_handler(httpd_req_t *req)
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{
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/* Log total visitors */
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unsigned *visitors = (unsigned *)req->user_ctx;
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ESP_LOGI(TAG, "/adder visitor count = %d", ++(*visitors));
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char buf[10];
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char outbuf[50];
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int ret;
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/* Read data received in the request */
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ret = httpd_req_recv(req, buf, sizeof(buf));
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if (ret <= 0) {
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if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
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httpd_resp_send_408(req);
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}
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return ESP_FAIL;
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}
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buf[ret] = '\0';
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int val = atoi(buf);
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ESP_LOGI(TAG, "/adder handler read %d", val);
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/* Create session's context if not already available */
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if (! req->sess_ctx) {
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ESP_LOGI(TAG, "/adder allocating new session");
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req->sess_ctx = malloc(sizeof(int));
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req->free_ctx = adder_free_func;
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*(int *)req->sess_ctx = 0;
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}
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/* Add the received data to the context */
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int *adder = (int *)req->sess_ctx;
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*adder += val;
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/* Respond with the accumulated value */
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snprintf(outbuf, sizeof(outbuf),"%d", *adder);
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httpd_resp_send(req, outbuf, strlen(outbuf));
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return ESP_OK;
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}
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/* This handler gets the present value of the accumulator */
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static esp_err_t adder_get_handler(httpd_req_t *req)
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{
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/* Log total visitors */
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unsigned *visitors = (unsigned *)req->user_ctx;
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ESP_LOGI(TAG, "/adder visitor count = %d", ++(*visitors));
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char outbuf[50];
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/* Create session's context if not already available */
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if (! req->sess_ctx) {
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ESP_LOGI(TAG, "/adder GET allocating new session");
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req->sess_ctx = malloc(sizeof(int));
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req->free_ctx = adder_free_func;
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*(int *)req->sess_ctx = 0;
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}
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ESP_LOGI(TAG, "/adder GET handler send %d", *(int *)req->sess_ctx);
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/* Respond with the accumulated value */
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snprintf(outbuf, sizeof(outbuf),"%d", *((int *)req->sess_ctx));
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httpd_resp_send(req, outbuf, strlen(outbuf));
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return ESP_OK;
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}
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/* This handler resets the value of the accumulator */
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static esp_err_t adder_put_handler(httpd_req_t *req)
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{
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/* Log total visitors */
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unsigned *visitors = (unsigned *)req->user_ctx;
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ESP_LOGI(TAG, "/adder visitor count = %d", ++(*visitors));
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char buf[10];
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char outbuf[50];
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int ret;
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/* Read data received in the request */
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ret = httpd_req_recv(req, buf, sizeof(buf));
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if (ret <= 0) {
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if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
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httpd_resp_send_408(req);
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}
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return ESP_FAIL;
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}
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buf[ret] = '\0';
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int val = atoi(buf);
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ESP_LOGI(TAG, "/adder PUT handler read %d", val);
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/* Create session's context if not already available */
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if (! req->sess_ctx) {
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ESP_LOGI(TAG, "/adder PUT allocating new session");
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req->sess_ctx = malloc(sizeof(int));
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req->free_ctx = adder_free_func;
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}
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*(int *)req->sess_ctx = val;
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/* Respond with the reset value */
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snprintf(outbuf, sizeof(outbuf),"%d", *((int *)req->sess_ctx));
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httpd_resp_send(req, outbuf, strlen(outbuf));
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return ESP_OK;
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}
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/* Maintain a variable which stores the number of times
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* the "/adder" URI has been visited */
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static unsigned visitors = 0;
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static const httpd_uri_t adder_post = {
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.uri = "/adder",
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.method = HTTP_POST,
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.handler = adder_post_handler,
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.user_ctx = &visitors
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};
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static const httpd_uri_t adder_get = {
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.uri = "/adder",
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.method = HTTP_GET,
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.handler = adder_get_handler,
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.user_ctx = &visitors
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};
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static const httpd_uri_t adder_put = {
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.uri = "/adder",
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.method = HTTP_PUT,
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.handler = adder_put_handler,
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.user_ctx = &visitors
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};
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static httpd_handle_t start_webserver(void)
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{
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httpd_config_t config = HTTPD_DEFAULT_CONFIG();
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// Start the httpd server
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ESP_LOGI(TAG, "Starting server on port: '%d'", config.server_port);
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httpd_handle_t server;
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if (httpd_start(&server, &config) == ESP_OK) {
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// Set URI handlers
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ESP_LOGI(TAG, "Registering URI handlers");
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httpd_register_uri_handler(server, &adder_get);
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httpd_register_uri_handler(server, &adder_put);
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httpd_register_uri_handler(server, &adder_post);
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return server;
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}
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ESP_LOGI(TAG, "Error starting server!");
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return NULL;
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}
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static void stop_webserver(httpd_handle_t server)
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{
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// Stop the httpd server
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httpd_stop(server);
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}
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static void disconnect_handler(void* arg, esp_event_base_t event_base,
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int32_t event_id, void* event_data)
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{
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httpd_handle_t* server = (httpd_handle_t*) arg;
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if (*server) {
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ESP_LOGI(TAG, "Stopping webserver");
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stop_webserver(*server);
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*server = NULL;
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}
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}
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static void connect_handler(void* arg, esp_event_base_t event_base,
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int32_t event_id, void* event_data)
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{
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httpd_handle_t* server = (httpd_handle_t*) arg;
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if (*server == NULL) {
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ESP_LOGI(TAG, "Starting webserver");
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*server = start_webserver();
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}
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}
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void app_main(void)
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{
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static httpd_handle_t server = NULL;
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ESP_ERROR_CHECK(nvs_flash_init());
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esp_netif_init();
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
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* Read "Establishing Wi-Fi or Ethernet Connection" section in
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* examples/protocols/README.md for more information about this function.
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*/
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ESP_ERROR_CHECK(example_connect());
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/* Register event handlers to stop the server when Wi-Fi or Ethernet is disconnected,
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* and re-start it upon connection.
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*/
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#ifdef CONFIG_EXAMPLE_CONNECT_WIFI
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ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &connect_handler, &server));
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ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &disconnect_handler, &server));
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#endif // CONFIG_EXAMPLE_CONNECT_WIFI
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#ifdef CONFIG_EXAMPLE_CONNECT_ETHERNET
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ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &connect_handler, &server));
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ESP_ERROR_CHECK(esp_event_handler_register(ETH_EVENT, ETHERNET_EVENT_DISCONNECTED, &disconnect_handler, &server));
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#endif // CONFIG_EXAMPLE_CONNECT_ETHERNET
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/* Start the server for the first time */
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server = start_webserver();
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}
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