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#include <freertos/FreeRTOS.h>
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <esp_log.h>
#include <esp_tls.h>
#include <esp_http_client.h>
#include <sys/param.h>
#include "stock.h"
#define PRICE_LEN 15
static char* TAG = "stock";
static esp_http_client_handle_t http_client;
static esp_err_t http_evt_handler(esp_http_client_event_t *evt)
{
static int read_len;
switch(evt->event_id) {
case HTTP_EVENT_ON_HEADER:
ESP_LOGD(TAG,
"HTTP_EVENT_ON_HEADER, key=%s, value=%s",
evt->header_key,
evt->header_value);
break;
case HTTP_EVENT_ON_DATA:
int copy_len = 0;
int cont_len = esp_http_client_get_content_length(evt->client);
char **user_data = (char **) evt->user_data;
if (*user_data == NULL) {
*user_data = calloc(cont_len + 1, sizeof(char));
if (!evt->user_data)
ESP_LOGE(TAG, "calloc() failed for response buffer");
}
if (evt->user_data) {
copy_len = MIN(evt->data_len, (cont_len - read_len));
if (copy_len) {
memcpy((*(char **) evt->user_data) + read_len,
evt->data, copy_len);
read_len += copy_len;
}
ESP_LOGD(TAG, "HTTP response size = %d bytes", read_len);
}
break;
case HTTP_EVENT_ON_FINISH:
read_len = 0;
ESP_LOGD(TAG, "HTTP_EVENT_ON_FINISH");
ESP_LOGD(TAG, "%s", *(char **) evt->user_data);
ESP_LOGD(TAG,
"response status=%d",
esp_http_client_get_status_code(evt->client));
break;
case HTTP_EVENT_DISCONNECTED:
int mbedtls_err = 0;
esp_err_t err;
ESP_LOGI(TAG, "HTTP_EVENT_DISCONNECTED");
err = esp_tls_get_and_clear_last_error(
(esp_tls_error_handle_t) evt->data,
&mbedtls_err,
NULL);
if (err != 0) {
ESP_LOGE(TAG, "Last esp error code: 0x%x", err);
ESP_LOGI(TAG, "Last mbedtls failure: 0x%x", mbedtls_err);
}
read_len = 0;
break;
default:
break;
}
return ESP_OK;
}
static inline int min(int a, int b) {
return a < b ? a : b;
}
static inline int max(int a, int b) {
return a > b ? a : b;
}
static inline int get_price_value(char **s, char *buf, int n) {
int i;
for (i = 0; **s && **s != '\n'; (*s)++) {
if (i < n - 1)
buf[i++] = **s;
}
buf[i] = '\0';
return (int)(atof(buf) * 100);
}
static inline void parse(char *s, struct stock_data *sd)
{
int i;
const int n = 10;
char buf_t[n];
char buf_p[n];
sd->price_max = 0;
sd->price_min = INT_MAX;
for (i = 0; *s && *s != '\n'; s++) {
if (i < n - 1)
buf_t[i++] = *s;
}
buf_t[i] = '\0';
if (*s)
s++;
sd->price_ref = get_price_value(&s, buf_p, n);
if (*s)
s++;
for (i = 0; *s && *s != '\n' && i < sd->prices_maxlen; i++) {
sd->prices[i] = get_price_value(&s, buf_p, n);
sd->price_min = min(sd->prices[i], sd->price_min);
sd->price_max = max(sd->prices[i], sd->price_max);
if (*s)
s++;
}
sd->prices_len = i;
if (!sd->price_ref)
sd->price_ref = sd->price_max + 1;
snprintf(sd->ticker, TICKER_LEN, "%s: %s", buf_t, buf_p);
}
void stock_get_data(struct stock_data *sd)
{
esp_err_t rc;
char *buf = NULL;
esp_http_client_config_t conf = {
.url = CONFIG_STOCK_API_URL,
.is_async = true,
.timeout_ms = 5000,
.event_handler = http_evt_handler,
.disable_auto_redirect = true,
.auth_type = HTTP_AUTH_TYPE_BASIC,
.max_authorization_retries = -1
};
http_client = esp_http_client_init(&conf);
esp_http_client_set_user_data(http_client, &buf);
for(;;) {
rc = esp_http_client_perform(http_client);
if (rc != ESP_ERR_HTTP_EAGAIN)
break;
vTaskDelay((TickType_t) 100 / portTICK_PERIOD_MS);
}
parse(buf, sd);
free(buf);
ESP_ERROR_CHECK(esp_http_client_cleanup(http_client));
http_client = NULL;
}
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