saga.js

import { push} from 'connected-react-router'
import { call, put, takeEvery } from 'redux-saga/effects'
import { getUrl, postUrl } from './api'
import {
    ARTICLES_FETCH_REQUESTED,
    ARTICLES_FETCH_SUCCEEDED,
    ARTICLES_FETCH_FAILED,
    ARTICLE_FETCH_REQUESTED,
    ARTICLE_FETCH_SUCCEEDED,
    ARTICLE_FETCH_FAILED,
    ARTICLE_CREATE_REQUESTED,
    ARTICLE_CREATE_FAILED
} from '../actions/constants'

function* fetchArticles(action) {
    try {
        const articles = yield call(
            getUrl,
            'http://localhost:8080/articles');
        yield put({type: ARTICLES_FETCH_SUCCEEDED, articles: articles});
    } catch(e) {
        yield put({type: ARTICLES_FETCH_FAILED, hasError: e.message});
    }
}

function* fetchArticle(action) {
    try {
        const article = yield call(
            getUrl,
            'http://localhost:8080/articles/' + action.articleId);
        yield put({type: ARTICLE_FETCH_SUCCEEDED, article: article});
    } catch(e) {
        yield put({type: ARTICLE_FETCH_FAILED, hasError: e.message});
    }
}

function* createArticle(action) {
    try {
        yield call(
            postUrl,
            'http://localhost:8080/articles/',
            action.articleTitle,
            action.articleContent);
        yield put(push('/'))
    } catch(e) {
        yield put({type: ARTICLE_CREATE_FAILED, hasError: e.message});
    }
    }

function* apiSaga() {
    yield takeEvery(ARTICLES_FETCH_REQUESTED, fetchArticles)
    yield takeEvery(ARTICLE_FETCH_REQUESTED, fetchArticle)
    yield takeEvery(ARTICLE_CREATE_REQUESTED, createArticle)
}

export default apiSaga;