music-player/src/reducers/promiseReducer.js

import {all, takeEvery, put, call} from 'redux-saga/effects';

export function promiseReducer(state = {}, { type, status, payload, error, name }) {
    if (type === 'PROMISE') {
        return {
            ...state,
            [name]: { status, payload, error }
        }
    }
    return state;
}

const actionPending = name => ({ type: 'PROMISE', status: 'PENDING', name })
const actionResolved = (name, payload) => ({ type: 'PROMISE', status: 'RESOLVED', name, payload })
const actionRejected = (name, error) => ({ type: 'PROMISE', status: 'REJECTED', name, error })

export const actionPromise = (name, promise) =>
    ({type: 'PROMISE_START', name, promise})

export function* promiseWorker(action){ //это типа actionPromise который thunk
    const {name, promise} = action
    yield put(actionPending(name))
    try {
        let data = yield promise
        yield put(actionResolved(name, data))
        return data
    }
    catch (error) {
        yield put(actionRejected(name, error))
    }
}


export function* promiseWatcher(){
    yield takeEvery('PROMISE_START', promiseWorker)
}