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<!DOCTYPE html>
<html>
<head>
<title>reduxMiddlewareFactory.js</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" media="all" href="public/stylesheets/normalize.css" />
<link rel="stylesheet" media="all" href="docco.css" />
</head>
<body>
<div class="container">
<div class="page">
<div class="header">
<h1>reduxMiddlewareFactory.js</h1>
<div class="toc">
<h3>Table of Contents</h3>
<ol>
<li>
<a class="source" href="appStateFactory.html">
appStateFactory.js
</a>
</li>
<li>
<a class="source" href="createAppDispatcher.html">
createAppDispatcher.js
</a>
</li>
<li>
<a class="source" href="StateWithSideEffects.html">
StateWithSideEffects.js
</a>
</li>
<li>
<a class="source" href="createChannels.html">
createChannels.js
</a>
</li>
<li>
<a class="source" href="createSagas.html">
createSagas.js
</a>
</li>
<li>
<a class="source" href="sagaInterfaceFactory.html">
sagaInterfaceFactory.js
</a>
</li>
<li>
<a class="source" href="Container.html">
Container.js
</a>
</li>
<li>
<a class="source" href="createContainer.html">
createContainer.js
</a>
</li>
<li>
<a class="source" href="createDangerouslySlowContainer.html">
createDangerouslySlowContainer.js
</a>
</li>
<li>
<a class="source" href="index.html">
index.js
</a>
</li>
<li>
<a class="source" href="ContainerHelpers.html">
ContainerHelpers.js
</a>
</li>
<li>
<a class="source" href="assert.html">
assert.js
</a>
</li>
<li>
<a class="source" href="cast.html">
cast.js
</a>
</li>
<li>
<a class="source" href="checkUnique.html">
checkUnique.js
</a>
</li>
<li>
<a class="source" href="isObservable.html">
isObservable.js
</a>
</li>
<li>
<a class="source" href="uuid.html">
uuid.js
</a>
</li>
<li>
<a class="source" href="ReduxSaga.html">
ReduxSaga.js
</a>
</li>
<li>
<a class="source" href="createReduxReducers.html">
createReduxReducers.js
</a>
</li>
<li>
<a class="source" href="reduxChannelName.html">
reduxChannelName.js
</a>
</li>
<li>
<a class="source" href="reduxMiddlewareFactory.html">
reduxMiddlewareFactory.js
</a>
</li>
<li>
<a class="source" href="rfluxMessage.html">
rfluxMessage.js
</a>
</li>
<li>
<a class="source" href="kefirEmitter.html">
kefirEmitter.js
</a>
</li>
</ol>
</div>
</div>
<div class='highlight'><pre><span class="hljs-keyword">import</span> kefir <span class="hljs-keyword">from</span> <span class="hljs-string">'kefir'</span>
<span class="hljs-keyword">import</span> assert <span class="hljs-keyword">from</span> <span class="hljs-string">'../internal/assert'</span>
<span class="hljs-keyword">import</span> reduxChannelName <span class="hljs-keyword">from</span> <span class="hljs-string">'./reduxChannelName'</span>
<span class="hljs-comment">/**
* This injects the middleware into the AppDispatcher. Middleware can stop propagation
* of events to observables by not calling "next(action)". Middleware can also
* transform actions or dispatch their own actions.
* @param {Object} opts
* @param {kefirEmitter} opts.AppDispatcher
* @param {middleware[]} opts.rawMiddleware
* @returns {MiddlewareFactory} factory
*/</span>
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">reduxMiddlewareFactory</span>(<span class="hljs-params">{AppDispatcher, rawMiddleware}</span>) </span>{
assert(AppDispatcher, <span class="hljs-string">'Need an AppDispatcher'</span>)
assert(rawMiddleware, <span class="hljs-string">'Need rawMiddleware'</span>)
<span class="hljs-keyword">let</span> state = <span class="hljs-literal">null</span>
<span class="hljs-keyword">const</span> reduxStore = {</pre></div>
<p>transform redux-formatted message to rflux</p>
<div class='highlight'><pre> dispatch: <span class="hljs-function"><span class="hljs-params">args</span> =></span> AppDispatcher.emit({
<span class="hljs-attr">channel</span>: reduxChannelName,
<span class="hljs-attr">actionType</span>: (args || {}).type,
<span class="hljs-attr">payload</span>: args || {}
}),
<span class="hljs-attr">getState</span>: <span class="hljs-function"><span class="hljs-params">()</span> =></span> state
}
<span class="hljs-keyword">const</span> middleware = rawMiddleware.map(<span class="hljs-function"><span class="hljs-params">__middleware</span> =></span> __middleware(reduxStore))
<span class="hljs-keyword">return</span> {
<span class="hljs-attr">setState</span>: <span class="hljs-function"><span class="hljs-params">_state</span> =></span> state = _state,
<span class="hljs-comment">/**
* This AppDispatcher is middleware aware.
* @returns {kefirEmitter} the AppDispatcher
**/</span>
appDispatcher() {
<span class="hljs-keyword">const</span> AppDispatcherObs =
AppDispatcher
.flatMap(<span class="hljs-function"><span class="hljs-params">rfluxAction</span> =></span>
middleware
.reduce(
<span class="hljs-function">(<span class="hljs-params">chain, _middleware</span>) =></span> {
<span class="hljs-keyword">let</span> transformedReduxAction
<span class="hljs-keyword">let</span> allowContinue = <span class="hljs-literal">false</span></pre></div>
<p>the “next” action doesn’t actually do anything…. it just tells the
chain of filters to continue. Also allows the middleware to transfom
the payload</p>
<div class='highlight'><pre> <span class="hljs-keyword">const</span> next = <span class="hljs-function"><span class="hljs-params">reduxAction</span> =></span> {
transformedReduxAction = reduxAction
allowContinue = <span class="hljs-literal">true</span>
}
<span class="hljs-keyword">return</span> chain
.filter(<span class="hljs-function"><span class="hljs-params">reduxAction</span> =></span> {
_middleware(next)(reduxAction)</pre></div>
<p>stop if next not called</p>
<div class='highlight'><pre> <span class="hljs-keyword">return</span> allowContinue
})</pre></div>
<p>transform action (if requested)</p>
<div class='highlight'><pre> .map(<span class="hljs-function"><span class="hljs-params">()</span> =></span> transformedReduxAction)
},
kefir.constant(
<span class="hljs-keyword">typeof</span> rfluxAction.payload === <span class="hljs-string">'undefined'</span> ? {} : rfluxAction.payload
)
)
.map(<span class="hljs-function"><span class="hljs-params">reduxAction</span> =></span> ({...rfluxAction, <span class="hljs-attr">payload</span>: reduxAction}))
)</pre></div>
<p>Yuck. Turn the observer into a dispatcher by adding an emit method that
dispatches events into the <em>original</em> AppDispatcher bus. Recall that the
AppDispatcher is a bus (an observable with an emit method).</p>
<div class='highlight'><pre> <span class="hljs-built_in">Object</span>.assign(AppDispatcherObs, {<span class="hljs-attr">emit</span>: <span class="hljs-function">(<span class="hljs-params">...args</span>) =></span> AppDispatcher.emit(...args)})
<span class="hljs-keyword">return</span> AppDispatcherObs
}
}
}</pre></div>
<div class="fleur">h</div>
</div>
</div>
</body>
</html>