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<head>
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<title>Configuring routers · GitBook</title>
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Route syntax
Route Syntax
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<a href="../basics/route_data.html">
Route data
Route Data
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<a href="../basics/route_conflicts.html">
Route conflicts
Route Conflicts
</a>
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</li>
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Coercion
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Plumatic Schema
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Clojure.spec
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Configuring routers
Configuring Routers
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Dynamic extensions
Dynamic Extensions
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Compiling middleware
Compiling Middleware
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<!-- Title -->
<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href=".." >Configuring routers</a>
<a href=".." >Configuring Routers</a>
</h1>
</div>
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<a href="../basics/route_syntax.html">
Route syntax
Route Syntax
</a>
@ -173,7 +173,7 @@
<a href="../basics/route_data.html">
Route data
Route Data
</a>
@ -186,7 +186,7 @@
<a href="../basics/route_conflicts.html">
Route conflicts
Route Conflicts
</a>
@ -199,7 +199,78 @@
</li>
<li class="chapter " data-level="1.3" data-path="./">
<li class="chapter " data-level="1.3" data-path="../coercion/">
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Coercion
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Coercion Explained
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<li class="chapter " data-level="1.3.2" data-path="../coercion/schema_coercion.html">
<a href="../coercion/schema_coercion.html">
Plumatic Schema
</a>
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<li class="chapter " data-level="1.3.3" data-path="../coercion/clojure_spec_coercion.html">
<a href="../coercion/clojure_spec_coercion.html">
Clojure.spec
</a>
</li>
<li class="chapter " data-level="1.3.4" data-path="../coercion/data_spec_coercion.html">
<a href="../coercion/data_spec_coercion.html">
Data-specs
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Configuring routers
Configuring Routers
</a>
@ -226,7 +297,7 @@
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Dynamic extensions
Dynamic Extensions
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Compiling middleware
Compiling Middleware
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</tr>
<tr>
<td><code>:mixed-router</code></td>
<td>Creates internally a <code>:prefix-tree-router</code> and a <code>:lookup-router</code> and used them to effectively get best-of-both-worlds. Valid only if there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
<td>Creates internally a <code>:segment-router</code> for wildcard routes and a <code>:lookup-router</code> or <code>:single-static-path-router</code> for static routes. Valid only if there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
</tr>
<tr>
<td><code>:single-static-path-router</code></td>
<td>Super fast router: sting-matches the route. Valid only if there is one static route.</td>
</tr>
<tr>
<td><code>:prefix-tree-router</code></td>
<td>Router that creates a <a href="https://en.wikipedia.org/wiki/Radix_tree" target="_blank">prefix-tree</a> out of an route table. Much faster than <code>:linear-router</code>. Valid only if there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
<td><code>:segment-router</code></td>
<td>Router that creates a optimized <a href="https://en.wikipedia.org/wiki/Trie" target="_blank">search trie</a> out of an route table. Much faster than <code>:linear-router</code> for wildcard routes. Valid only if there are no <a href="../basics/route_conflicts.html">Route conflicts</a>.</td>
</tr>
</tbody>
</table>
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<a href="../basics/route_syntax.html">
Route syntax
Route Syntax
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<a href="../basics/route_data.html">
Route data
Route Data
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<a href="../basics/route_conflicts.html">
Route conflicts
Route Conflicts
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</li>
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Coercion
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Plumatic Schema
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<li class="chapter " data-level="1.3.3" data-path="../coercion/clojure_spec_coercion.html">
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Clojure.spec
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Data-specs
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Configuring routers
Configuring Routers
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Dynamic extensions
Dynamic Extensions
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Compiling middleware
Compiling Middleware
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@ -341,7 +412,7 @@
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@ -440,7 +511,7 @@
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<li><a href="different_routers.html">Different Routers</a></li>
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@ -121,7 +121,7 @@
<a href="../basics/route_syntax.html">
Route syntax
Route Syntax
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@ -173,7 +173,7 @@
<a href="../basics/route_data.html">
Route data
Route Data
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@ -186,7 +186,7 @@
<a href="../basics/route_conflicts.html">
Route conflicts
Route Conflicts
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@ -199,7 +199,78 @@
</li>
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Coercion
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<a href="../coercion/coercion.html">
Coercion Explained
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</li>
<li class="chapter " data-level="1.3.2" data-path="../coercion/schema_coercion.html">
<a href="../coercion/schema_coercion.html">
Plumatic Schema
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<li class="chapter " data-level="1.3.3" data-path="../coercion/clojure_spec_coercion.html">
<a href="../coercion/clojure_spec_coercion.html">
Clojure.spec
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</li>
<li class="chapter " data-level="1.3.4" data-path="../coercion/data_spec_coercion.html">
<a href="../coercion/data_spec_coercion.html">
Data-specs
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Configuring routers
Configuring Routers
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Dynamic extensions
Dynamic Extensions
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@ -297,7 +368,7 @@
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Compiling middleware
Compiling Middleware
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@ -341,7 +412,7 @@
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<a href="route_syntax.html">
Route syntax
Route Syntax
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@ -173,7 +173,7 @@
<a href="route_data.html">
Route data
Route Data
</a>
@ -186,7 +186,7 @@
<a href="route_conflicts.html">
Route conflicts
Route Conflicts
</a>
@ -199,7 +199,78 @@
</li>
<li class="chapter " data-level="1.3" data-path="../advanced/">
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Coercion
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Coercion Explained
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<li class="chapter " data-level="1.3.2" data-path="../coercion/schema_coercion.html">
<a href="../coercion/schema_coercion.html">
Plumatic Schema
</a>
</li>
<li class="chapter " data-level="1.3.3" data-path="../coercion/clojure_spec_coercion.html">
<a href="../coercion/clojure_spec_coercion.html">
Clojure.spec
</a>
</li>
<li class="chapter " data-level="1.3.4" data-path="../coercion/data_spec_coercion.html">
<a href="../coercion/data_spec_coercion.html">
Data-specs
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<li class="chapter " data-level="1.4" data-path="../advanced/">
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@ -213,12 +284,12 @@
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<li class="chapter " data-level="1.4.1" data-path="../advanced/configuring_routers.html">
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Configuring routers
Configuring Routers
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@ -226,7 +297,7 @@
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Dynamic extensions
Dynamic Extensions
</a>
@ -297,7 +368,7 @@
</li>
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<li class="chapter " data-level="1.5.5" data-path="../ring/compiling_middleware.html">
<a href="../ring/compiling_middleware.html">
Compiling middleware
Compiling Middleware
</a>
@ -341,7 +412,7 @@
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<li class="chapter " data-level="1.9" >
<span>
@ -440,12 +511,12 @@
<h1 id="basics">Basics</h1>
<ul>
<li><a href="route_syntax.html">Route syntax</a></li>
<li><a href="route_syntax.html">Route Syntax</a></li>
<li><a href="router.html">Router</a></li>
<li><a href="path_based_routing.html">Path-based Routing</a></li>
<li><a href="name_based_routing.html">Name-based Routing</a></li>
<li><a href="route_data.html">Route data</a></li>
<li><a href="route_conflicts.html">Route conflicts</a></li>
<li><a href="route_data.html">Route Data</a></li>
<li><a href="route_conflicts.html">Route Conflicts</a></li>
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Compiling Middleware
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<section class="normal markdown-section">
<h2 id="name-based-reverse-routing">Name-based (reverse) routing</h2>
<h2 id="name-based-reverse-routing">Name-based (reverse) Routing</h2>
<p>All routes which have <code>:name</code> route data defined, can also be matched by name.</p>
<p>Given a router:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
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Configuring Routers
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<section class="normal markdown-section">
<h2 id="path-based-routing">Path-based routing</h2>
<h2 id="path-based-routing">Path-based Routing</h2>
<p>Path-based routing is done using the <code>reitit.core/match-by-path</code> function. It takes the router and path as arguments and returns one of the following:</p>
<ul>
<li><code>nil</code>, no match</li>
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<!-- Title -->
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<a href=".." >Route conflicts</a>
<a href=".." >Route Conflicts</a>
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@ -438,7 +509,7 @@
<section class="normal markdown-section">
<h1 id="route-conflicts">Route conflicts</h1>
<h1 id="route-conflicts">Route Conflicts</h1>
<p>Many routing libraries allow multiple matches for a single path lookup. Usually, the first match is used and the rest are effecively unreachanle. This is not good, especially if route tree is merged from multiple sources.</p>
<p>Reitit resolves this by running explicit conflicit resolution when a <code>router</code> is called. Conflicting routes are passed into a <code>:conflicts</code> callback. Default implementation throws <code>ex-info</code> with a descriptive message.</p>
<p>Examples router with conflicting routes:</p>
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Route syntax
Route Syntax
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Route data
Route Data
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Route conflicts
Route Conflicts
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Configuring Routers
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Dynamic extensions
Dynamic Extensions
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<!-- Title -->
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<i class="fa fa-circle-o-notch fa-spin"></i>
<a href=".." >Route data</a>
<a href=".." >Route Data</a>
</h1>
</div>
@ -438,7 +509,7 @@
<section class="normal markdown-section">
<h1 id="route-data">Route data</h1>
<h1 id="route-data">Route Data</h1>
<p>Route data is the heart of this library. Routes can have any data attachted to them. Data is interpeted either by the client application or the <code>Router</code> via it&apos;s <code>:coerce</code> and <code>:compile</code> hooks. This enables co-existence of both <a href="https://youtu.be/x9pxbnFC4aQ?t=1907" target="_blank">adaptive and principled</a> components.</p>
<p>Routes can have a non-sequential route argument that is expanded into route data map when a router is created.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
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Route data
Route Data
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Route data
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<h1 id="clojurespec-coercion">Clojure.spec Coercion</h1>
<p>The <a href="https://clojure.org/guides/spec" target="_blank">clojure.spec</a> library specifies the structure of data, validates or destructures it, and can generate data based on the spec.</p>
<p><strong>NOTE</strong>: Currently, <code>clojure.spec</code> <a href="https://dev.clojure.org/jira/browse/CLJ-2116" target="_blank">doesn&apos;t support runtime transformations via conforming</a>, so one needs to wrap all specs into <a href="https://github.com/metosin/spec-tools/blob/master/README.md#spec-records" target="_blank">Spec Records</a> to get the coercion working.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[spec-tools.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
<span class="hljs-comment">;; need to wrap the primitives!</span>
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::company</span> spec/string?)
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::user-id</span> spec/int?)
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::path-params</span> (<span class="hljs-name">s/keys</span> <span class="hljs-symbol">:req-un</span> [<span class="hljs-symbol">::company</span> <span class="hljs-symbol">::user-id</span>]))
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.spec/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> <span class="hljs-symbol">::path-params</span>}}]
{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> route-and-coerce! [path]
(<span class="hljs-name"><span class="hljs-builtin-name">if-let</span></span> [match (<span class="hljs-name">r/match-by-path</span> router path)]
(<span class="hljs-name"><span class="hljs-builtin-name">assoc</span></span> match <span class="hljs-symbol">:parameters</span> (<span class="hljs-name">coercion/coerce!</span> match))))
</code></pre>
<p>Successful coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion #SpecCoercion{...}</span>
<span class="hljs-comment">; :parameters {:path ::path-params}},</span>
<span class="hljs-comment">; :result {:path #object[reitit.coercion$request_coercer$]},</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :parameters {:path {:company &quot;metosin&quot;, :user-id 123}}</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>Failing coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/ikitommi&quot;</span>)
<span class="hljs-comment">; =&gt; ExceptionInfo Request coercion failed...</span>
</code></pre>
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<h1 id="coercion-explained">Coercion Explained</h1>
<p>Coercion is a process of transforming parameters (and responses) from one format into another. Reitit separates routing and coercion into separate steps.</p>
<p>By default, all wildcard and catch-all parameters are parsed as Strings:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> <span class="hljs-symbol">::user-view</span>]))
</code></pre>
<p>Here&apos;s a match with the String <code>:params</code>:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> r <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view},</span>
<span class="hljs-comment">; :result nil,</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>To enable parameter coercion, we need to do few things:</p>
<ol>
<li>Define a <code>Coercion</code> for the routes</li>
<li>Define types for the parameters</li>
<li>Compile coercers for the types</li>
<li>Apply the coercion</li>
</ol>
<h2 id="define-coercion">Define Coercion</h2>
<p><code>reitit.coercion/Coercion</code> is a protocol defining how types are defined, coerced and inventoried.</p>
<p>Reitit has the following coercion modules:</p>
<ul>
<li><code>reitit.coercion.schema/coercion</code> for <a href="https://github.com/plumatic/schema" target="_blank">plumatic schema</a>.</li>
<li><code>reitit.coercion.spec/coercion</code> for both <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> and <a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">data-specs</a>.</li>
</ul>
<p>Coercion can be attached to route data under <code>:coercion</code> key. There can be multiple <code>Coercion</code> implementation into a single router, normal <a href="../basics/route_data.html#nested-route-data">scoping rules</a> apply.</p>
<h2 id="defining-parameters">Defining parameters</h2>
<p>Route parameters can be defined via route data <code>:parameters</code>. It has keys for different type of parameters: <code>:query</code>, <code>:body</code>, <code>:form</code>, <code>:header</code> and <code>:path</code>. Syntax for the actual parameters is defined by the <code>Coercion</code>.</p>
<p>Here&apos;s the example with Schema path-parameters:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion.schema])
(<span class="hljs-name">require</span> &apos;[schema.core <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
<span class="hljs-symbol">:user-id</span> s/Int}}}]))
</code></pre>
<p>Routing again:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> r <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion #SchemaCoercion{...}</span>
<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
<span class="hljs-comment">; :user-id Int}}},</span>
<span class="hljs-comment">; :result nil,</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>Coercion was not applied. Why? All we did was just added more data to the route and the routing functions are just responsible for routing, not coercion.</p>
<p>But now we should have enough data on the match to apply the coercion.</p>
<h2 id="compiling-coercers">Compiling coercers</h2>
<p>Before the actual coercion, we need to compile the coercers against the route data. This is because compiled coercers yield much better performance. A separate step makes thing explicit and non-magical. Compiling could be done via a Middleware, Interceptor but we can also do it at Router-level, effecting all routes.</p>
<p>There is a helper function for the coercer compiling in <code>reitit.coercion</code>:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.schema])
(<span class="hljs-name">require</span> &apos;[schema.core <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
<span class="hljs-symbol">:user-id</span> s/Int}}}]
{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
</code></pre>
<p>Routing again:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> r <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion #SchemaCoercion{...}</span>
<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
<span class="hljs-comment">; :user-id Int}}},</span>
<span class="hljs-comment">; :result {:path #object[reitit.coercion$request_coercer$]},</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>The compiler added a <code>:result</code> key into the match (done just once, at router creation time), which holds the compiled coercers. We are almost done.</p>
<h2 id="applying-coercion">Applying coercion</h2>
<p>We can use a helper function to do the actual coercion, based on a <code>Match</code>:</p>
<pre><code class="lang-clj">(<span class="hljs-name">coercion/coerce!</span>
(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">&quot;/metosin/users/123&quot;</span>))
<span class="hljs-comment">; {:path {:company &quot;metosin&quot;, :user-id 123}}</span>
</code></pre>
<p>If a coercion fails, a typed (<code>:reitit.coercion/request-coercion</code>) ExceptionInfo is thrown, with descriptive data about the actual error:</p>
<pre><code class="lang-clj">(<span class="hljs-name">coercion/coerce!</span>
(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">&quot;/metosin/users/ikitommi&quot;</span>))
<span class="hljs-comment">; =&gt; ExceptionInfo Request coercion failed:</span>
<span class="hljs-comment">; #CoercionError{:schema {:company java.lang.String, :user-id Int, Any Any},</span>
<span class="hljs-comment">; :errors {:user-id (not (integer? &quot;ikitommi&quot;))}}</span>
<span class="hljs-comment">; clojure.core/ex-info (core.clj:4739)</span>
</code></pre>
<h2 id="full-example">Full example</h2>
<p>Here&apos;s an full example of routing + coercion.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion.schema])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[schema.core <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
<span class="hljs-symbol">:user-id</span> s/Int}}}]
{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> route-and-coerce! [path]
(<span class="hljs-name"><span class="hljs-builtin-name">if-let</span></span> [match (<span class="hljs-name">r/match-by-path</span> router path)]
(<span class="hljs-name"><span class="hljs-builtin-name">assoc</span></span> match <span class="hljs-symbol">:parameters</span> (<span class="hljs-name">coercion/coerce!</span> match))))
(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion #SchemaCoercion{...}</span>
<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
<span class="hljs-comment">; :user-id Int}}},</span>
<span class="hljs-comment">; :result {:path #object[reitit.coercion$request_coercer$]},</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :parameters {:path {:company &quot;metosin&quot;, :user-id 123}}</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/ikitommi&quot;</span>)
<span class="hljs-comment">; =&gt; ExceptionInfo Request coercion failed...</span>
</code></pre>
<h2 id="ring-coercion">Ring Coercion</h2>
<p>For a full-blown http-coercion, see the <a href="../ring/coercion.html">ring coercion</a>.</p>
<h2 id="thanks-to">Thanks to</h2>
<p>Most of the thing are just polished version of the original implementations. Big thanks to:</p>
<ul>
<li><a href="https://clojars.org/metosin/compojure-api" target="_blank">compojure-api</a> for the initial <code>Coercion</code> protocol</li>
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<h1 id="data-spec-coercion">Data-spec Coercion</h1>
<p><a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">Data-specs</a> is alternative, macro-free syntax to define <code>clojure.spec</code>s. As a bonus, supports the <a href="https://dev.clojure.org/jira/browse/CLJ-2116" target="_blank">runtime transformations via conforming</a> out-of-the-box.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.spec/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> string?
<span class="hljs-symbol">:user-id</span> int?}}}]
{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> route-and-coerce! [path]
(<span class="hljs-name"><span class="hljs-builtin-name">if-let</span></span> [match (<span class="hljs-name">r/match-by-path</span> router path)]
(<span class="hljs-name"><span class="hljs-builtin-name">assoc</span></span> match <span class="hljs-symbol">:parameters</span> (<span class="hljs-name">coercion/coerce!</span> match))))
</code></pre>
<p>Successful coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion #SpecCoercion{...}</span>
<span class="hljs-comment">; :parameters {:path {:company string?,</span>
<span class="hljs-comment">; :user-id int?}}},</span>
<span class="hljs-comment">; :result {:path #object[reitit.coercion$request_coercer$]},</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :parameters {:path {:company &quot;metosin&quot;, :user-id 123}}</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>Failing coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/ikitommi&quot;</span>)
<span class="hljs-comment">; =&gt; ExceptionInfo Request coercion failed...</span>
</code></pre>
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<h1 id="plumatic-schema-coercion">Plumatic Schema Coercion</h1>
<p><a href="https://github.com/plumatic/schema" target="_blank">Plumatic Schema</a> is a Clojure(Script) library for declarative data description and validation.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion.schema])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[schema.core <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
<span class="hljs-symbol">:user-id</span> s/Int}}}]
{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> route-and-coerce! [path]
(<span class="hljs-name"><span class="hljs-builtin-name">if-let</span></span> [match (<span class="hljs-name">r/match-by-path</span> router path)]
(<span class="hljs-name"><span class="hljs-builtin-name">assoc</span></span> match <span class="hljs-symbol">:parameters</span> (<span class="hljs-name">coercion/coerce!</span> match))))
</code></pre>
<p>Successful coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion #SchemaCoercion{...}</span>
<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
<span class="hljs-comment">; :user-id Int}}},</span>
<span class="hljs-comment">; :result {:path #object[reitit.coercion$request_coercer$]},</span>
<span class="hljs-comment">; :params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :parameters {:path {:company &quot;metosin&quot;, :user-id 123}}</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>Failing coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">route-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/ikitommi&quot;</span>)
<span class="hljs-comment">; =&gt; ExceptionInfo Request coercion failed...</span>
</code></pre>
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Route syntax
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Route data
Route Data
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Route conflicts
Route Conflicts
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Configuring routers
Configuring Routers
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Dynamic extensions
Dynamic Extensions
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<a href="ring/compiling_middleware.html">
Compiling middleware
Compiling Middleware
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<li>First-class <a href="basics/route_data.html">route data</a></li>
<li>Bi-directional routing</li>
<li><a href="ring/ring.html">Ring-router</a> with <a href="ring/data_driven_middleware.html">data-driven middleware</a></li>
<li><a href="ring/coercion.html">Pluggable coercion</a> (<a href="https://github.com/plumatic/schema" target="_blank">schema</a> &amp; <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a>)</li>
<li><a href="coercion/coercion.html">Pluggable coercion</a> (<a href="https://github.com/plumatic/schema" target="_blank">schema</a> &amp; <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a>)</li>
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Route syntax
Route Syntax
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Route data
Route Data
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Route conflicts
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Plumatic Schema
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Data-specs
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Configuring routers
Configuring Routers
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Dynamic extensions
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Compiling middleware
Compiling Middleware
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<p>So, we need to test something more realistic.</p>
<h3 id="restful-apis">RESTful apis</h3>
<p>To get better view on the real life routing performance, there is <a href="https://github.com/metosin/reitit/blob/master/perf-test/clj/reitit/opensensors_perf_test.clj" target="_blank">test</a> of a mid-size rest(ish) http api with 50+ routes, having a lot of path parameters. The route definitions are pulled off from the <a href="https://opensensors.io/" target="_blank">OpenSensors</a> swagger definitions.</p>
<p>Thanks to the <a href="https://en.wikipedia.org/wiki/Radix_tree" target="_blank">prefix-tree</a> algorithm, <code>reitit-ring</code> and Pedestal are fastest here.</p>
<p>Thanks to the snappy <a href="https://github.com/metosin/reitit/blob/master/modules/reitit-core/src/reitit/segment.cljc" target="_blank">segment-tree</a> algorithm, <code>reitit-ring</code> is fastest here. Pedestal is also fast with it&apos;s <a href="https://en.wikipedia.org/wiki/Radix_tree" target="_blank">prefix-tree</a> implementation.</p>
<p><img src="images/opensensors.png" alt="Opensensors perf test"></p>
<h3 id="cqrs-apis">CQRS apis</h3>
<p>Another real-life <a href="https://github.com/metosin/reitit/blob/master/perf-test/clj/reitit/lupapiste_perf_test.clj" target="_blank">test scenario</a> is a <a href="https://martinfowler.com/bliki/CQRS.html" target="_blank">CQRS</a>-style route tree, where all the paths are static, e.g. <code>/api/command/add-order</code>. The route definitions are pulled out from <a href="https://github.com/lupapiste/lupapiste" target="_blank">Lupapiste</a>. The test consists of ~300 static routes (just the commands here, there would be ~200 queries too).</p>
<p>Again, both <code>reitit-ring</code> and Pedestal shine here, thanks to the fast lookup-routers. On average, they are two orders of magnitude faster and on best/worst case, three orders of magnitude faster than the other tested libs. Ataraxy failed this test on <code>Method code too large</code> error.</p>
<p>Again, both <code>reitit-ring</code> and Pedestal shine here, thanks to the fast lookup-routers. On average, they are <strong>two</strong> and on best case, <strong>three orders of magnitude faster</strong> than the other tested libs. Ataraxy failed this test on <code>Method code too large!</code> error.</p>
<p><img src="images/lupapiste.png" alt="Opensensors perf test"></p>
<p><strong>NOTE</strong>: If there would be even one wildcard route in the route-tree, Pedestal would fallback from lookup-router to the prefix-tree router, yielding constant, but order of magnitude slower perf. Reitit instead fallbacks to <code>:mixed-router</code>, still serving the static routes with lookup-router, just the wildcard route(s) with prefix-tree. So, the performance would not notably degrade.</p>
<p><strong>NOTE</strong>: If there would be even one wildcard route in the route-tree, Pedestal would fallback from lookup-router to the prefix-tree router, yielding nearly constant, but an order of magnitude slower perf. Reitit instead fallbacks to <code>:mixed-router</code>, serving all the static routes with <code>:lookup-router</code>, just the wildcard route(s) with <code>:segment-tree</code>. So, the performance would not notably degrade.</p>
<h3 id="why-measure">Why measure?</h3>
<p>The routing perf needs to be measured to get an internal baseline to optimize against. We also want to ensure that new features don&apos;t regress the performance. Perf tests should be run in a stable CI environment. Help welcome.</p>
<h3 id="looking-out-of-the-box">Looking out of the box</h3>
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@ -121,7 +121,7 @@
<a href="../basics/route_syntax.html">
Route syntax
Route Syntax
</a>
@ -173,7 +173,7 @@
<a href="../basics/route_data.html">
Route data
Route Data
</a>
@ -186,7 +186,7 @@
<a href="../basics/route_conflicts.html">
Route conflicts
Route Conflicts
</a>
@ -199,7 +199,78 @@
</li>
<li class="chapter " data-level="1.3" data-path="../advanced/">
<li class="chapter " data-level="1.3" data-path="../coercion/">
<a href="../coercion/">
Coercion
</a>
<ul class="articles">
<li class="chapter " data-level="1.3.1" data-path="../coercion/coercion.html">
<a href="../coercion/coercion.html">
Coercion Explained
</a>
</li>
<li class="chapter " data-level="1.3.2" data-path="../coercion/schema_coercion.html">
<a href="../coercion/schema_coercion.html">
Plumatic Schema
</a>
</li>
<li class="chapter " data-level="1.3.3" data-path="../coercion/clojure_spec_coercion.html">
<a href="../coercion/clojure_spec_coercion.html">
Clojure.spec
</a>
</li>
<li class="chapter " data-level="1.3.4" data-path="../coercion/data_spec_coercion.html">
<a href="../coercion/data_spec_coercion.html">
Data-specs
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.4" data-path="../advanced/">
<a href="../advanced/">
@ -213,12 +284,12 @@
<ul class="articles">
<li class="chapter " data-level="1.3.1" data-path="../advanced/configuring_routers.html">
<li class="chapter " data-level="1.4.1" data-path="../advanced/configuring_routers.html">
<a href="../advanced/configuring_routers.html">
Configuring routers
Configuring Routers
</a>
@ -226,7 +297,7 @@
</li>
<li class="chapter " data-level="1.3.2" data-path="../advanced/different_routers.html">
<li class="chapter " data-level="1.4.2" data-path="../advanced/different_routers.html">
<a href="../advanced/different_routers.html">
@ -239,7 +310,7 @@
</li>
<li class="chapter " data-level="1.3.3" data-path="../advanced/route_validation.html">
<li class="chapter " data-level="1.4.3" data-path="../advanced/route_validation.html">
<a href="../advanced/route_validation.html">
@ -257,7 +328,7 @@
</li>
<li class="chapter " data-level="1.4" data-path="./">
<li class="chapter " data-level="1.5" data-path="./">
<a href="./">
@ -271,7 +342,7 @@
<ul class="articles">
<li class="chapter " data-level="1.4.1" data-path="ring.html">
<li class="chapter " data-level="1.5.1" data-path="ring.html">
<a href="ring.html">
@ -284,12 +355,12 @@
</li>
<li class="chapter " data-level="1.4.2" data-path="dynamic_extensions.html">
<li class="chapter " data-level="1.5.2" data-path="dynamic_extensions.html">
<a href="dynamic_extensions.html">
Dynamic extensions
Dynamic Extensions
</a>
@ -297,7 +368,7 @@
</li>
<li class="chapter " data-level="1.4.3" data-path="data_driven_middleware.html">
<li class="chapter " data-level="1.5.3" data-path="data_driven_middleware.html">
<a href="data_driven_middleware.html">
@ -310,7 +381,7 @@
</li>
<li class="chapter active" data-level="1.4.4" data-path="coercion.html">
<li class="chapter active" data-level="1.5.4" data-path="coercion.html">
<a href="coercion.html">
@ -323,12 +394,12 @@
</li>
<li class="chapter " data-level="1.4.5" data-path="compiling_middleware.html">
<li class="chapter " data-level="1.5.5" data-path="compiling_middleware.html">
<a href="compiling_middleware.html">
Compiling middleware
Compiling Middleware
</a>
@ -341,7 +412,7 @@
</li>
<li class="chapter " data-level="1.5" data-path="../performance.html">
<li class="chapter " data-level="1.6" data-path="../performance.html">
<a href="../performance.html">
@ -354,7 +425,7 @@
</li>
<li class="chapter " data-level="1.6" data-path="../faq.html">
<li class="chapter " data-level="1.7" data-path="../faq.html">
<a href="../faq.html">
@ -367,7 +438,7 @@
</li>
<li class="chapter " data-level="1.7" >
<li class="chapter " data-level="1.8" >
<span>
@ -380,7 +451,7 @@
</li>
<li class="chapter " data-level="1.8" >
<li class="chapter " data-level="1.9" >
<span>
@ -439,11 +510,11 @@
<section class="normal markdown-section">
<h1 id="pluggable-coercion">Pluggable Coercion</h1>
<p>Reitit provides pluggable parameter coercion via <code>reitit.ring.coercion.protocol/Coercion</code> protocol, originally introduced in <a href="https://clojars.org/metosin/compojure-api" target="_blank">compojure-api</a>.</p>
<p>Reitit provides pluggable parameter coercion via <code>reitit.coercion/Coercion</code> protocol, originally introduced in <a href="https://clojars.org/metosin/compojure-api" target="_blank">compojure-api</a>.</p>
<p>Reitit ships with the following coercion modules:</p>
<ul>
<li><code>reitit.ring.coercion.schema/SchemaCoercion</code> for <a href="https://github.com/plumatic/schema" target="_blank">plumatic schema</a>.</li>
<li><code>reitit.ring.coercion.spec/SpecCoercion</code> for both <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> and <a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">data-specs</a>.</li>
<li><code>reitit.coercion.schema/coercion</code> for <a href="https://github.com/plumatic/schema" target="_blank">plumatic schema</a>.</li>
<li><code>reitit.coercion.spec/coercion</code> for both <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> and <a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">data-specs</a>.</li>
</ul>
<h3 id="ring-request-and-response-coercion">Ring request and response coercion</h3>
<p>To use <code>Coercion</code> with Ring, one needs to do the following:</p>
@ -455,17 +526,17 @@
</li>
<li>Set a <code>Coercion</code> implementation to route data under <code>:coercion</code></li>
<li>Mount request &amp; response coercion middleware to the routes (can be done for all routes as the middleware are only mounted to routes which have the parameters &amp;/ responses defined):<ul>
<li><code>reitit.ring.coercion/coerce-request-middleware</code></li>
<li><code>reitit.ring.coercion/coerce-response-middleware</code></li>
<li><code>reitit.ring.coercion-middleware/coerce-request-middleware</code></li>
<li><code>reitit.ring.coercion-middleware/coerce-response-middleware</code></li>
</ul>
</li>
</ol>
<p>If the request coercion succeeds, the coerced parameters are injected into request under <code>:parameters</code>.</p>
<p>If either request or response coercion fails, an descriptive error is thrown. To turn the exceptions into http responses, one can also mount the <code>reitit.ring.coercion/coerce-exceptions-middleware</code> middleware</p>
<p>If either request or response coercion fails, an descriptive error is thrown. To turn the exceptions into http responses, one can also mount the <code>reitit.ring.coercion-middleware/coerce-exceptions-middleware</code> middleware</p>
<h3 id="example-with-schema">Example with Schema</h3>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion.schema <span class="hljs-symbol">:as</span> schema])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion-middleware <span class="hljs-symbol">:as</span> coercion-middleware])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.schema <span class="hljs-symbol">:as</span> schema])
(<span class="hljs-name">require</span> &apos;[schema.core <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
@ -473,13 +544,13 @@
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:post</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:x</span> s/Int, <span class="hljs-symbol">:y</span> s/Int}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:schema</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name">s/constrained</span> s/Int pos?}}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:schema</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name">s/constrained</span> s/Int pos?)}}}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion/coerce-exceptions-middleware
coercion/coerce-request-middleware
coercion/coerce-response-middleware]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion-middleware/coerce-exceptions-middleware
coercion-middleware/coerce-request-middleware
coercion-middleware/coerce-response-middleware]
<span class="hljs-symbol">:coercion</span> schema/coercion}})))
</code></pre>
<p>Valid request:</p>
@ -496,7 +567,7 @@
<span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>
<span class="hljs-symbol">:body-params</span> {<span class="hljs-symbol">:x</span> <span class="hljs-number">1</span>, <span class="hljs-symbol">:y</span> <span class="hljs-string">&quot;2&quot;</span>}})
<span class="hljs-comment">; {:status 400,</span>
<span class="hljs-comment">; :body {:type :reitit.ring.coercion/request-coercion</span>
<span class="hljs-comment">; :body {:type :reitit.coercion/request-coercion</span>
<span class="hljs-comment">; :coercion :schema</span>
<span class="hljs-comment">; :in [:request :body-params]</span>
<span class="hljs-comment">; :value {:x 1, :y &quot;2&quot;}</span>
@ -505,8 +576,8 @@
</code></pre>
<h3 id="example-with-data-specs">Example with data-specs</h3>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion-middleware <span class="hljs-symbol">:as</span> coercion-middleware])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
@ -517,9 +588,9 @@
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion/coerce-exceptions-middleware
coercion/coerce-request-middleware
coercion/coerce-response-middleware]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion-middleware/coerce-exceptions-middleware
coercion-middleware/coerce-request-middleware
coercion-middleware/coerce-response-middleware]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
<p>Valid request:</p>
@ -550,8 +621,8 @@
<h3 id="example-with-clojurespec">Example with clojure.spec</h3>
<p>Currently, <code>clojure.spec</code> <a href="https://dev.clojure.org/jira/browse/CLJ-2116" target="_blank">doesn&apos;t support runtime transformations via conforming</a>, so one needs to wrap all specs with <code>spec-tools.core/spec</code>.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion-middleware <span class="hljs-symbol">:as</span> coercion-middleware])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[spec-tools.core <span class="hljs-symbol">:as</span> st])
@ -570,9 +641,9 @@
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion/coerce-exceptions-middleware
coercion/coerce-request-middleware
coercion/coerce-response-middleware]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion-middleware/coerce-exceptions-middleware
coercion-middleware/coerce-request-middleware
coercion-middleware/coerce-response-middleware]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
<p>Valid request:</p>
@ -603,16 +674,16 @@
<h3 id="custom-coercion">Custom coercion</h3>
<p>Both Schema and Spec Coercion can be configured via options, see the source code for details.</p>
<p>To plug in new validation engine, see the
<code>reitit.ring.coercion.protocol/Coercion</code> protocol.</p>
<code>reitit.coercion/Coercion</code> protocol.</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defprotocol</span></span> Coercion
<span class="hljs-string">&quot;Pluggable coercion protocol&quot;</span>
(<span class="hljs-name">get-name</span> [this] <span class="hljs-string">&quot;Keyword name for the coercion&quot;</span>)
(<span class="hljs-name">get-apidocs</span> [this model data] <span class="hljs-string">&quot;???&quot;</span>)
(<span class="hljs-name">compile-model</span> [this model name] <span class="hljs-string">&quot;Compiles a coercion model&quot;</span>)
(<span class="hljs-name">open-model</span> [this model] <span class="hljs-string">&quot;Returns a new map model which doesn&apos;t fail on extra keys&quot;</span>)
(<span class="hljs-name">encode-error</span> [this error] <span class="hljs-string">&quot;Converts error in to a serializable format&quot;</span>)
(<span class="hljs-name">request-coercer</span> [this type model] <span class="hljs-string">&quot;Returns a `value format =&gt; value` request coercion function&quot;</span>)
(<span class="hljs-name">response-coercer</span> [this model] <span class="hljs-string">&quot;Returns a `value format =&gt; value` response coercion function&quot;</span>))
(<span class="hljs-name">-get-name</span> [this] <span class="hljs-string">&quot;Keyword name for the coercion&quot;</span>)
(<span class="hljs-name">-get-apidocs</span> [this model data] <span class="hljs-string">&quot;???&quot;</span>)
(<span class="hljs-name">-compile-model</span> [this model name] <span class="hljs-string">&quot;Compiles a coercion model&quot;</span>)
(<span class="hljs-name">-open-model</span> [this model] <span class="hljs-string">&quot;Returns a new map model which doesn&apos;t fail on extra keys&quot;</span>)
(<span class="hljs-name">-encode-error</span> [this error] <span class="hljs-string">&quot;Converts error in to a serializable format&quot;</span>)
(<span class="hljs-name">-request-coercer</span> [this type model] <span class="hljs-string">&quot;Returns a `value format =&gt; value` request coercion function&quot;</span>)
(<span class="hljs-name">-response-coercer</span> [this model] <span class="hljs-string">&quot;Returns a `value format =&gt; value` response coercion function&quot;</span>))
</code></pre>
@ -646,7 +717,7 @@
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</li>
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<li class="chapter " data-level="1.4.3" data-path="../advanced/route_validation.html">
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<a href="dynamic_extensions.html">
Dynamic extensions
Dynamic Extensions
</a>
@ -297,7 +368,7 @@
</li>
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@ -310,7 +381,7 @@
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<a href="compiling_middleware.html">
Compiling middleware
Compiling Middleware
</a>
@ -341,7 +412,7 @@
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<span>
@ -423,7 +494,7 @@
<!-- Title -->
<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href=".." >Dynamic extensions</a>
<a href=".." >Dynamic Extensions</a>
</h1>
</div>
@ -438,7 +509,7 @@
<section class="normal markdown-section">
<h1 id="dynamic-extensions">Dynamic extensions</h1>
<h1 id="dynamic-extensions">Dynamic Extensions</h1>
<p><code>ring-handler</code> injects the <code>Match</code> into a request and it can be extracted at runtime with <code>reitit.ring/get-match</code>. This can be used to build ad-hoc extensions to the system.</p>
<p>Example middleware to guard routes based on user roles:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[clojure.set <span class="hljs-symbol">:as</span> set])
@ -517,7 +588,7 @@
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Route syntax
Route Syntax
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@ -173,7 +173,7 @@
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Route data
Route Data
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@ -186,7 +186,7 @@
<a href="../basics/route_conflicts.html">
Route conflicts
Route Conflicts
</a>
@ -199,7 +199,78 @@
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Plumatic Schema
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Configuring routers
Configuring Routers
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@ -226,7 +297,7 @@
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@ -239,7 +310,7 @@
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Dynamic extensions
Dynamic Extensions
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Compiling middleware
Compiling Middleware
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@ -441,10 +512,10 @@
<h1 id="ring">Ring</h1>
<ul>
<li><a href="ring.html">Ring-router</a></li>
<li><a href="dynamic_extensions.html">Dynamic extensions</a></li>
<li><a href="dynamic_extensions.html">Dynamic Extensions</a></li>
<li><a href="data_driven_middleware.html">Data-driven Middleware</a></li>
<li><a href="coercion.html">Pluggable Coercion</a></li>
<li><a href="compiling_middleware.html">Compiling middleware</a></li>
<li><a href="compiling_middleware.html">Compiling Middleware</a></li>
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@ -489,7 +560,7 @@
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Route syntax
Route Syntax
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@ -173,7 +173,7 @@
<a href="../basics/route_data.html">
Route data
Route Data
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@ -186,7 +186,7 @@
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Route conflicts
Route Conflicts
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@ -199,7 +199,78 @@
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Plumatic Schema
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Clojure.spec
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Data-specs
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Configuring routers
Configuring Routers
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@ -226,7 +297,7 @@
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Dynamic extensions
Dynamic Extensions
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@ -297,7 +368,7 @@
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Compiling middleware
Compiling Middleware
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