lbry-desktop/src/renderer/redux/actions/cost_info.js

import * as ACTIONS from 'constants/action_types';
import Lbryio from 'lbryio';
import { selectClaimsByUri } from 'redux/selectors/claims';

// eslint-disable-next-line import/prefer-default-export
export function doFetchCostInfoForUri(uri) {
  return function(dispatch, getState) {
    const state = getState();
    const claim = selectClaimsByUri(state)[uri];

    if (!claim) return;

    function resolve(costInfo) {
      dispatch({
        type: ACTIONS.FETCH_COST_INFO_COMPLETED,
        data: {
          uri,
          costInfo,
        },
      });
    }

    const fee =
      claim.value && claim.value.stream && claim.value.stream.metadata
        ? claim.value.stream.metadata.fee
        : undefined;

    if (fee === undefined) {
      resolve({ cost: 0, includesData: true });
    } else if (fee.currency === 'LBC') {
      resolve({ cost: fee.amount, includesData: true });
    } else {
      Lbryio.getExchangeRates().then(({ LBC_USD }) => {
        resolve({ cost: fee.amount / LBC_USD, includesData: true });
      });
    }
  };
}