# subOraclePrices

Subscribes to price feed updates for specified tokens.

#### Parameters

* `tokens` (string\[]): An array of token identifiers.
* `callback` ((price: PriceFeed) => void): A function to be called with each price update.

#### Returns

* `Promise<void>`: A promise that resolves when the subscription is set up.

#### Description

This method establishes a subscription to price feed updates for the specified tokens. It maps the token identifiers to their corresponding Pyth object IDs and price feed IDs, then sets up a subscription using the Sui Price Service Connection.

When a price update is received, the method modifies the `price.id` to match the token identifier format used in the system, then calls the provided callback function with the updated price information.

#### Example Usage

```typescript
export function useTokenPrice(network: string) {
  const [tokenPrice, setTokenPrice] = useState<{ [key: string]: number }>({});
  const [isLoading, setIsLoading] = useState<boolean>(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (isLoading) return;

    setIsLoading(true);
    const oracleAPI = new OracleAPI(network);

    Promise.all([
      oracleAPI.subOraclePrices(
        Array.from(
          new Set([...Object.keys(oracleAPI.consts.pythFeeder.feeder)]),
        ),
        priceInfo => {
          setTokenPrice(prevPrice => ({
            ...prevPrice,
            [priceInfo.id]: priceInfo
              .getPriceUnchecked()
              .getPriceAsNumberUnchecked(),
          }));
        },
      ),
    ])
      .then(() => {
        setIsLoading(false);
      })
      .catch(err => {
        console.error(err);
        setError(err.message);
        setIsLoading(false);
      });
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [network]);

  return {
    tokenPrice,
    isLoading,
    error,
  };
}
```


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