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createDva.js
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createDva.js
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import React from 'react';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware, compose, combineReducers } from 'redux';
import createSagaMiddleware from 'redux-saga/lib/internal/middleware';
import { takeEvery, takeLatest, throttle } from 'redux-saga/lib/internal/sagaHelpers';
import handleActions from 'redux-actions/lib/handleActions';
import * as sagaEffects from 'redux-saga/effects';
import isPlainObject from 'is-plain-object';
import invariant from 'invariant';
import warning from 'warning';
import flatten from 'flatten';
import window from 'global/window';
import Plugin from './plugin';
const SEP = '/';
export default function createDva(createOpts) {
const {
mobile,
initialReducer,
defaultHistory,
routerMiddleware,
setupHistory,
} = createOpts;
/**
* Create a dva instance.
*/
return function dva(hooks = {}) {
// history and initialState does not pass to plugin
const history = hooks.history || defaultHistory;
const initialState = hooks.initialState || {};
delete hooks.history;
delete hooks.initialState;
const plugin = new Plugin();
plugin.use(hooks);
const app = {
// properties
_models: [],
_router: null,
_store: null,
_history: null,
_plugin: plugin,
// methods
use,
model,
router,
start,
};
return app;
////////////////////////////////////
// Methods
/**
* Register an object of hooks on the application.
*
* @param hooks
*/
function use(hooks) {
plugin.use(hooks);
}
/**
* Register a model.
*
* @param model
*/
function model(model) {
this._models.push(checkModel(model, mobile));
}
// inject model dynamically
function injectModel(createReducer, onError, m) {
m = checkModel(m, mobile);
this._models.push(m);
const store = this._store;
// reducers
store.asyncReducers[m.namespace] = getReducer(m.reducers, m.state);
store.replaceReducer(createReducer(store.asyncReducers));
// effects
if (m.effects) {
store.runSaga(getSaga(m.effects, m, onError));
}
// subscriptions
if (m.subscriptions) {
runSubscriptions(m.subscriptions, m, this, onError);
}
}
/**
* Config router. Takes a function with arguments { history, dispatch },
* and expects router config. It use the same api as react-router,
* return jsx elements or JavaScript Object for dynamic routing.
*
* @param router
*/
function router(router) {
invariant(typeof router === 'function', 'app.router: router should be function');
this._router = router;
}
/**
* Start the application. Selector is optional. If no selector
* arguments, it will return a function that return JSX elements.
*
* @param container selector | HTMLElement
*/
function start(container) {
// support selector
if (typeof container === 'string') {
container = document.querySelector(container);
invariant(container, 'app.start: could not query selector: ' + container);
}
invariant(!container || isHTMLElement(container), 'app.start: container should be HTMLElement');
invariant(this._router, 'app.start: router should be defined');
// error wrapper
const onError = plugin.apply('onError', function(err) {
throw new Error(err.stack || err);
});
const onErrorWrapper = (err) => {
if (err) {
if (typeof err === 'string') err = new Error(err);
onError(err, app._store.dispatch);
}
};
// get reducers and sagas from model
let sagas = [];
let reducers = { ...initialReducer };
for (let m of this._models) {
reducers[m.namespace] = getReducer(m.reducers, m.state);
if (m.effects) sagas.push(getSaga(m.effects, m, onErrorWrapper));
}
// extra reducers
const extraReducers = plugin.get('extraReducers');
invariant(
Object.keys(extraReducers).every(key => !(key in reducers)),
'app.start: extraReducers is conflict with other reducers'
);
// create store
const extraMiddlewares = plugin.get('onAction');
const reducerEnhancer = plugin.get('onReducer');
const sagaMiddleware = createSagaMiddleware();
let middlewares = [
sagaMiddleware,
...flatten(extraMiddlewares),
];
if (routerMiddleware) {
middlewares = [routerMiddleware(history), ...middlewares];
}
const devtools = window.devToolsExtension || (() => noop => noop);
const enhancers = [
applyMiddleware(...middlewares),
devtools(),
];
const store = this._store = createStore(
createReducer(),
initialState,
compose(...enhancers)
);
function createReducer(asyncReducers) {
return reducerEnhancer(combineReducers({
...reducers,
...extraReducers,
...asyncReducers,
}));
}
// extend store
store.runSaga = sagaMiddleware.run;
store.asyncReducers = {};
// store change
const listeners = plugin.get('onStateChange');
for (let listener of listeners) {
store.subscribe(listener);
}
// start saga
sagas.forEach(sagaMiddleware.run);
// setup history
if (setupHistory) setupHistory.call(this, history);
// run subscriptions
for (let model of this._models) {
if (model.subscriptions) {
runSubscriptions(model.subscriptions, model, this, onErrorWrapper);
}
}
// inject model after start
this.model = injectModel.bind(this, createReducer, onErrorWrapper);
// If has container, render; else, return react component
if (container) {
render(container, store, this, this._router);
plugin.apply('onHmr')(render.bind(this, container, store, this));
} else {
return getProvider(store, this, this._router);
}
}
////////////////////////////////////
// Helpers
function getProvider(store, app, router) {
return (extraProps) => (
<Provider store={store}>
{ router({ app, history: app._history, ...extraProps }) }
</Provider>
);
}
function render(container, store, app, router) {
const ReactDOM = require('react-dom');
ReactDOM.render(React.createElement(getProvider(store, app, router)), container);
}
function checkModel(m, mobile) {
// Clone model to avoid prefixing namespace multiple times
const model = { ...m };
const { namespace, reducers, effects } = model;
invariant(
namespace,
'app.model: namespace should be defined'
);
invariant(
!app._models.some(model => model.namespace === namespace),
'app.model: namespace should be unique'
);
invariant(
mobile || namespace !== 'routing',
'app.model: namespace should not be routing, it\'s used by react-redux-router'
);
invariant(
!model.subscriptions || isPlainObject(model.subscriptions),
'app.model: subscriptions should be Object'
);
invariant(
!reducers || isPlainObject(reducers) || Array.isArray(reducers),
'app.model: reducers should be Object or array'
);
invariant(
!Array.isArray(reducers) || (isPlainObject(reducers[0]) && typeof reducers[1] === 'function'),
'app.model: reducers with array should be app.model({ reducers: [object, function] })'
);
invariant(
!effects || isPlainObject(effects),
'app.model: effects should be Object'
);
function applyNamespace(type) {
function getNamespacedReducers(reducers) {
return Object.keys(reducers).reduce((memo, key) => {
warning(
key.indexOf(`${namespace}${SEP}`) !== 0,
`app.model: ${type.slice(0, -1)} ${key} should not be prefixed with namespace ${namespace}`
);
memo[`${namespace}${SEP}${key}`] = reducers[key];
return memo;
}, {});
}
if (model[type]) {
if (type === 'reducers' && Array.isArray(model[type])) {
model[type][0] = getNamespacedReducers(model[type][0]);
} else {
model[type] = getNamespacedReducers(model[type]);
}
}
}
applyNamespace('reducers');
applyNamespace('effects');
return model;
}
function isHTMLElement(node) {
return typeof node === 'object' && node !== null && node.nodeType && node.nodeName;
}
function getReducer(reducers, state) {
if (Array.isArray(reducers)) {
return reducers[1](handleActions(reducers[0], state));
} else {
return handleActions(reducers || {}, state);
}
}
function getSaga(effects, model, onError) {
return function *() {
for (let key in effects) {
const watcher = getWatcher(key, effects[key], model, onError);
yield sagaEffects.fork(watcher);
}
}
}
function getWatcher(key, _effect, model, onError) {
let effect = _effect;
let type = 'takeEvery';
let ms;
if (Array.isArray(_effect)) {
effect = _effect[0];
const opts = _effect[1];
if (opts && opts.type) {
type = opts.type;
if (type === 'throttle') {
invariant(
opts.ms,
'app.start: opts.ms should be defined if type is throttle'
);
ms = opts.ms;
}
}
invariant(
['watcher', 'takeEvery', 'takeLatest', 'throttle'].indexOf(type) > -1,
'app.start: effect type should be takeEvery, takeLatest, throttle or watcher'
);
}
function *sagaWithCatch(...args) {
try {
yield effect(...args.concat(createEffects(model)));
} catch(e) {
onError(e);
}
}
const onEffect = plugin.get('onEffect');
const sagaWithOnEffect = applyOnEffect(onEffect, sagaWithCatch, model, key);
switch (type) {
case 'watcher':
return sagaWithCatch;
case 'takeLatest':
return function*() {
yield takeLatest(key, sagaWithOnEffect);
};
case 'throttle':
return function*() {
yield throttle(ms, key, sagaWithOnEffect);
};
// takeEvery
default:
return function*() {
yield takeEvery(key, sagaWithOnEffect);
};
}
}
function runSubscriptions(subs, model, app, onError) {
for (let key in subs) {
const sub = subs[key];
invariant(typeof sub === 'function', 'app.start: subscription should be function');
sub({
dispatch: createDispatch(app._store.dispatch, model),
history: app._history,
}, onError);
}
}
function prefixType(type, model) {
const prefixedType = `${model.namespace}${SEP}${type}`;
if ((model.reducers && model.reducers[prefixedType])
|| (model.effects && model.effects[prefixedType])) {
return prefixedType;
}
return type;
}
function createEffects(model) {
function put(action) {
const { type } = action;
invariant(type, 'dispatch: action should be a plain Object with type');
warning(
type.indexOf(`${model.namespace}${SEP}`) !== 0,
`effects.put: ${type} should not be prefixed with namespace ${model.namespace}`
);
return sagaEffects.put({ ...action, type: prefixType(type, model) });
}
return { ...sagaEffects, put };
}
function createDispatch(dispatch, model) {
return action => {
const { type } = action;
invariant(type, 'dispatch: action should be a plain Object with type');
warning(
type.indexOf(`${model.namespace}${SEP}`) !== 0,
`dispatch: ${type} should not be prefixed with namespace ${model.namespace}`
);
return dispatch({ ...action, type: prefixType(type, model) });
};
}
function applyOnEffect(fns, effect, model, key) {
for (let fn of fns) {
effect = fn(effect, sagaEffects, model, key);
}
return effect;
}
};
}