redux-thunk-actions/src/index.js

redux-thunk-actions ===================

import { createAction } from 'redux-actions';

/**
 * Creates an async action creator
 *
 * @param  {String} TYPE                 the type of the action
 * @param  {Function} fn                 the function to be called async
 * @param  {Boolean} suppressException   optionally do not throw exceptions
 * @return {Funtion}                     the action creator
 */
export function createActionThunk (type, fn, suppressException) {
  const TYPE_STARTED     = `${type}_STARTED`;
  const TYPE_SUCCEEDED = `${type}_SUCCEEDED`;
  const TYPE_FAILED    = `${type}_FAILED`;
  const TYPE_ENDED     = `${type}_ENDED`;
  const actionCreators = {
    [TYPE_STARTED]     : createAction(TYPE_STARTED),
    [TYPE_SUCCEEDED] : createAction(TYPE_SUCCEEDED),
    [TYPE_FAILED]    : createAction(TYPE_FAILED),
    [TYPE_ENDED]     : createAction(TYPE_ENDED)
  };
  const successActionWithMeta =
    createAction(TYPE_SUCCEEDED, ({payload}) => payload, ({meta}) => meta);

  const factory = (...args) => (dispatch, getState, extra) => {
    let result;
    let startedAt = (new Date()).getTime();
    dispatch(actionCreators[TYPE_STARTED](args));
    const succeeded = (data) => {
      const action = data && data.payload
        ? successActionWithMeta(data)
        : actionCreators[TYPE_SUCCEEDED](data);

      dispatch(action);
      let endedAt = (new Date()).getTime();
      dispatch(actionCreators[TYPE_ENDED]({
        elapsed: endedAt - startedAt
      }));
      return data;
    };
    const failed = (err) => {
      let endedAt = (new Date()).getTime();
      dispatch(actionCreators[TYPE_FAILED](err));
      dispatch(actionCreators[TYPE_ENDED]({
        elapsed: endedAt - startedAt
      }));
      if(!suppressException) {
        throw err;
      }
    }
    try {
      result = fn(...args, {getState, dispatch, extra});
    } catch (error) {
      failed(error);
    }
    // in case of async (promise), use success and fail callbacks.
    if (isPromise(result)) {
      return result.then(succeeded, failed);
    }
    return succeeded(result);
  }

  factory.NAME = type;
  factory.START = actionCreators[TYPE_STARTED].toString();
  factory.STARTED = factory.START;
  factory.SUCCEEDED = actionCreators[TYPE_SUCCEEDED].toString();
  factory.FAILED = actionCreators[TYPE_FAILED].toString();
  factory.ENDED = actionCreators[TYPE_ENDED].toString();

  return factory;
}

//helpers
function isPromise(p) {
  return p && p.then && p.catch;
}