btclock_v3/src/lib/price_fetch.cpp

#include "price_fetch.hpp"

const PROGMEM char *cgApiUrl =
    "https://api.coingecko.com/api/v3/simple/"
    "price?ids=bitcoin&vs_currencies=usd%2Ceur";

TaskHandle_t priceFetchTaskHandle;

void taskPriceFetch(void *pvParameters) {
  WiFiClientSecure *client = new WiFiClientSecure;
  client->setInsecure();
  for (;;) {
    ulTaskNotifyTake(pdTRUE, portMAX_DELAY);

    HTTPClient *http = new HTTPClient();
    http->setUserAgent(USER_AGENT);

    // Send HTTP request to CoinGecko API
    http->begin(*client, cgApiUrl);

    int httpCode = http->GET();

    // Parse JSON response and extract average price
    uint usdPrice, eurPrice;
    if (httpCode == 200) {
      String payload = http->getString();
      StaticJsonDocument<96> doc;
      deserializeJson(doc, payload);
      //            usdPrice = doc["bitcoin"]["usd"];
      eurPrice = doc["bitcoin"]["eur"].as<uint>();

      setPrice(eurPrice);
      if (workQueue != nullptr && (getCurrentScreen() == SCREEN_BTC_TICKER ||
                                   getCurrentScreen() == SCREEN_MSCW_TIME ||
                                   getCurrentScreen() == SCREEN_MARKET_CAP)) {
        WorkItem priceUpdate = {TASK_PRICE_UPDATE, 0};
        xQueueSend(workQueue, &priceUpdate, portMAX_DELAY);
      }

      preferences.putUInt("lastPrice", eurPrice);
    } else {
      Serial.print(
          F("Error retrieving BTC/USD price (CoinGecko). HTTP status code: "));
      Serial.println(httpCode);
      if (httpCode == -1) {
        WiFi.reconnect();
      }
    }
  }
}

void setupPriceFetchTask() {
  xTaskCreate(taskPriceFetch, "priceFetch", (6 * 1024), NULL, tskIDLE_PRIORITY,
              &priceFetchTaskHandle);

  xTaskNotifyGive(priceFetchTaskHandle);
}