Redux API Middleware

A simple middleware based on the one from the Redux Docs.

Installation

  npm install @edy/redux-api-middleware

Usage

Please see Middleware Docs on how to add middleware to redux. This is how i use it:

import { createStore, applyMiddleware } from 'redux';
import apiMiddleware from '@edy/redux-api-middleware';
import rootReducer from './reducers/index';

const store = createStore(
  rootReducer,
  applyMiddleware(apiMiddleware)
);

Example 1 (easy)

Action:

export function loadUsers () {
	return {
		types: [START, SUCCESS, ERROR],
		callAPI: () => fetch('/users'),
	};
};

Then somewhere in your component:

dispatch(loadUsers());

Reducer:

switch (action.type) {
	case START:
		return {
			...state,
			isLoading: true
		};

	case SUCCESS:
		return {
			...state,
			users: action.response,
			isLoading: false
		};

	case ERROR:
		return {
			...state,
			isLoading: false,
			error: action.error
		};
	default:
		return state;
}

Example 2 (not so easy)

Action:

export function setToken (newToken) {
	return {
		types: [START, SUCCESS, ERROR],
		payload: {
			token: newToken
		},
		shouldCallAPI: (state) => {
			const { token, tokenSentToServer, tokenDidInvalidate, tokenSentToServerOn, tokenIsUpdating } = state.settings;
			const lastUpdated = new Date() - new Date(tokenSentToServerOn);

			if (token !== newToken) {
				return true;
			} else if (tokenIsUpdating) {
				return false;
			} else if (lastUpdated > 86400000) { // 86400s = 24h
				return true;
			} else if (!tokenSentToServer) {
				return true;
			}

			return tokenDidInvalidate;
		},
		callAPI: ({ dispatch, getState, payload}) => api.setToken(newToken).then((data) => newToken),
		onStart: ({ dispatch, getState, payload}) => {
			// do something before the api is called
		},
		onSuccess: ({ dispatch, getState, payload, response }) => {
			// do something after api was called
		},
		onError: ({ dispatch, getState, payload, error }) => {
			// do something after an error occured, maybe display a notification
		},
	};
};

Then somewhere in your component:

dispatch(setToken(1234567890));

Reducer:

switch (action.type) {
	case START:
		return {
			...state,
			tokenSentToServer: false,
			tokenIsUpdating: true
		};

	case SUCCESS:
		return {
			...state,
			token: action.payload.token,
			tokenSentToServer: true,
			tokenDidInvalidate: false,
			tokenIsUpdating: false
		};

	case ERROR:
		return {
			...state,
			tokenSentToServer: false,
			tokenIsUpdating: false
		};
	default:
		return state;
}