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Route Conflicts
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Default handler
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Dynamic Extensions
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Data-driven Middleware
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Transforming Middleware Chain
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Middleware Registry
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Default Middleware
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Route Data Validation
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Compiling Middleware
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Interceptors
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Pedestal
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Default Interceptors
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Controllers
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Configuring Routers
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Composing Routers
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Different Routers
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Route Validation
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Dev Workflow
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Shared Routes
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Performance
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Development Instructions
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FAQ
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Published with GitBook
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Data-driven Middleware</a>
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</h1>
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</div>
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<section class="normal markdown-section">
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<h1 id="data-driven-middleware">Data-driven Middleware</h1>
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<p>Ring <a href="https://github.com/ring-clojure/ring/wiki/Concepts#middleware" target="_blank">defines middleware</a> as a function of type <code>handler & args => request => response</code>. It's relatively easy to understand and enables good performance. Downside is that the middleware-chain is just a opaque function, making things like debugging and composition hard. It's too easy to apply the middleware in wrong order.</p>
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<p>Reitit defines middleware as data:</p>
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<ol>
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<li>Middleware can be defined as first-class data entries</li>
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<li>Middleware can be mounted as a <a href="https://github.com/duct-framework/duct/wiki/Configuration" target="_blank">duct-style</a> vector (of middleware)</li>
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<li>Middleware can be optimized & <a href="compiling_middleware.html">compiled</a> againt an endpoint</li>
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<li>Middleware chain can be transformed by the router</li>
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</ol>
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<h2 id="middleware-as-data">Middleware as data</h2>
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<p>All values in the <code>:middleware</code> vector in the route data are expanded into <code>reitit.middleware/Middleware</code> Records with using the <code>reitit.middleware/IntoMiddleware</code> Protocol. By default, functions, maps and <code>Middleware</code> records are allowed.</p>
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<p>Records can have arbitrary keys, but the following keys have a special purpose:</p>
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<table>
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<thead>
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<tr>
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<th>key</th>
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<th>description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>:name</code></td>
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<td>Name of the middleware as a qualified keyword</td>
|
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</tr>
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<tr>
|
|
<td><code>:spec</code></td>
|
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<td><code>clojure.spec</code> definition for the route data, see <a href="route_data_validation.html">route data validation</a> (optional)</td>
|
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</tr>
|
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<tr>
|
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<td><code>:wrap</code></td>
|
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<td>The actual middleware function of <code>handler & args => request => response</code></td>
|
|
</tr>
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<tr>
|
|
<td><code>:compile</code></td>
|
|
<td>Middleware compilation function, see <a href="compiling_middleware.html">compiling middleware</a>.</td>
|
|
</tr>
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</tbody>
|
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</table>
|
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<p>Middleware Records are accessible in their raw form in the compiled route results, thus available for inventories, creating api-docs etc.</p>
|
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<p>For the actual request processing, the Records are unwrapped into normal functions and composed into a middleware function chain, yielding zero runtime penalty.</p>
|
|
<h3 id="creating-middleware">Creating Middleware</h3>
|
|
<p>The following produce identical middleware runtime function.</p>
|
|
<h3 id="function">Function</h3>
|
|
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> wrap [handler id]
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [request]
|
|
(<span class="hljs-name">handler</span> (<span class="hljs-name">update</span> request <span class="hljs-symbol">::acc</span> (<span class="hljs-name">fnil</span> conj []) id))))
|
|
</code></pre>
|
|
<h3 id="map">Map</h3>
|
|
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> wrap3
|
|
{<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::wrap3</span>
|
|
<span class="hljs-symbol">:description</span> <span class="hljs-string">"Middleware that does things."</span>
|
|
<span class="hljs-symbol">:wrap</span> wrap})
|
|
</code></pre>
|
|
<h3 id="record">Record</h3>
|
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<pre><code class="lang-clj">(<span class="hljs-name">require</span> '[reitit.middleware <span class="hljs-symbol">:as</span> middleware])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> wrap2
|
|
(<span class="hljs-name">middleware/create</span>
|
|
{<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::wrap2</span>
|
|
<span class="hljs-symbol">:description</span> <span class="hljs-string">"Middleware that does things."</span>
|
|
<span class="hljs-symbol">:wrap</span> wrap}))
|
|
</code></pre>
|
|
<h2 id="using-middleware">Using Middleware</h2>
|
|
<p><code>:middleware</code> is merged to endpoints by the <code>router</code>.</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">require</span> '[reitit.ring <span class="hljs-symbol">:as</span> ring])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> handler [{<span class="hljs-symbol">:keys</span> [<span class="hljs-symbol">::acc</span>]}]
|
|
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> (<span class="hljs-name"><span class="hljs-builtin-name">conj</span></span> acc <span class="hljs-symbol">:handler</span>)})
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
|
|
(<span class="hljs-name">ring/ring-handler</span>
|
|
(<span class="hljs-name">ring/router</span>
|
|
[<span class="hljs-string">"/api"</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">1</span>] [wrap2 <span class="hljs-number">2</span>]]}
|
|
[<span class="hljs-string">"/ping"</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:middleware</span> [[wrap3 <span class="hljs-number">3</span>]]
|
|
<span class="hljs-symbol">:handler</span> handler}}]])))
|
|
</code></pre>
|
|
<p>All the middleware are applied correctly:</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">"/api/ping"</span>})
|
|
<span class="hljs-comment">; {:status 200, :body [1 2 3 :handler]}</span>
|
|
</code></pre>
|
|
<h2 id="compiling-middleware">Compiling middleware</h2>
|
|
<p>Middleware can be optimized against an endpoint using <a href="compiling_middleware.html">middleware compilation</a>.</p>
|
|
<h2 id="ideas-for-the-future">Ideas for the future</h2>
|
|
<ul>
|
|
<li>Support Middleware dependency resolution with new keys <code>:requires</code> and <code>:provides</code>. Values are set of top-level keys of the request. e.g.<ul>
|
|
<li><code>InjectUserIntoRequestMiddleware</code> requires <code>#{:session}</code> and provides <code>#{:user}</code></li>
|
|
<li><code>AuthorizationMiddleware</code> requires <code>#{:user}</code></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
<p>Ideas welcome & see <a href="https://github.com/metosin/reitit/issues" target="_blank">issues</a> for details.</p>
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