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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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Ring Coercion
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Route Data Validation
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Compiling Middleware
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RESTful form methods
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Interceptors
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Sieppari
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Default Interceptors
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Transforming Interceptor Chain
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< h1 id = "interceptors" > Interceptors< / h1 >
< p > Reitit also support for < a href = "http://pedestal.io/reference/interceptors" target = "_blank" > interceptors< / a > as an alternative to using middleware. Basic interceptor handling is implemented in < code > reitit.interceptor< / code > package. There is no interceptor executor shipped, but you can use libraries like < a href = "https://github.com/pedestal/pedestal/tree/master/interceptor" target = "_blank" > Pedestal Interceptor< / a > or < a href = "https://github.com/metosin/sieppari" target = "_blank" > Sieppari< / a > to execute the chains.< / p >
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< h2 id = "reitit-http" > Reitit-http< / h2 >
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< pre > < code class = "lang-clj" > [metosin/reitit-http < span class = "hljs-string" > " 0.3.9" < / span > ]
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< / code > < / pre >
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< p > An module for http-routing using interceptors instead of middleware. Builds on top of the < a href = "../ring/ring.html" > < code > reitit-ring< / code > < / a > module having all the same features.< / p >
< p > The differences:< / p >
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< ul >
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< li > < code > :interceptors< / code > key in used in route data instead of < code > :middleware< / code > < / li >
< li > < code > reitit.http/http-router< / code > requires an extra option < code > :executor< / code > of type < code > reitit.interceptor/Executor< / code > to execute the interceptor chain< ul >
< li > optionally, a routing interceptor can be used - it enqueues the matched interceptors into the context. See < code > reitit.http/routing-interceptor< / code > for details.< / li >
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< / ul >
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< / li >
< / ul >
< h2 id = "simple-example" > Simple example< / h2 >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.ring < span class = "hljs-symbol" > :as< / span > ring])
(< span class = "hljs-name" > require< / span > ' [reitit.http < span class = "hljs-symbol" > :as< / span > http])
(< span class = "hljs-name" > require< / span > ' [reitit.interceptor.sieppari < span class = "hljs-symbol" > :as< / span > sieppari])
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > defn< / span > < / span > interceptor [number]
{< span class = "hljs-symbol" > :enter< / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span > [ctx] (< span class = "hljs-name" > < span class = "hljs-builtin-name" > update-in< / span > < / span > ctx [< span class = "hljs-symbol" > :request< / span > < span class = "hljs-symbol" > :number< / span > ] (< span class = "hljs-name" > fnil< / span > + < span class = "hljs-number" > 0< / span > ) number))})
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > app
(< span class = "hljs-name" > http/ring-handler< / span >
(< span class = "hljs-name" > http/router< / span >
[< span class = "hljs-string" > " /api" < / span >
{< span class = "hljs-symbol" > :interceptors< / span > [(< span class = "hljs-name" > interceptor< / span > < span class = "hljs-number" > 1< / span > )]}
[< span class = "hljs-string" > " /number" < / span >
{< span class = "hljs-symbol" > :interceptors< / span > [(< span class = "hljs-name" > interceptor< / span > < span class = "hljs-number" > 10< / span > )]
< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :interceptors< / span > [(< span class = "hljs-name" > interceptor< / span > < span class = "hljs-number" > 100< / span > )]
< span class = "hljs-symbol" > :handler< / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span > [req]
{< 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" > select-keys< / span > < / span > req [< span class = "hljs-symbol" > :number< / span > ])})}}]])
< span class = "hljs-comment" > ;; the default handler< / span >
(< span class = "hljs-name" > ring/create-default-handler< / span > )
< span class = "hljs-comment" > ;; executor< / span >
{< span class = "hljs-symbol" > :executor< / span > sieppari/executor}))
(< 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" > " /" < / span > })
< span class = "hljs-comment" > ; {:status 404, :body " " , :headers {}}< / span >
(< 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/number" < / span > })
< span class = "hljs-comment" > ; {:status 200, :body {:number 111}}< / span >
< / code > < / pre >
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< h2 id = "why-interceptors" > Why interceptors?< / h2 >
< ul >
< li > < a href = "https://quanttype.net/posts/2018-08-03-why-interceptors.html" target = "_blank" > https://quanttype.net/posts/2018-08-03-why-interceptors.html< / a > < / li >
< li > < a href = "https://www.reddit.com/r/Clojure/comments/9csmty/why_interceptors/" target = "_blank" > https://www.reddit.com/r/Clojure/comments/9csmty/why_interceptors/< / a > < / li >
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< script src = "../gitbook/gitbook.js" > < / script >
< script src = "../gitbook/theme.js" > < / script >
< script src = "../gitbook/gitbook-plugin-editlink/plugin.js" > < / script >
< script src = "../gitbook/gitbook-plugin-github/plugin.js" > < / script >
< script src = "../gitbook/gitbook-plugin-search/search-engine.js" > < / script >
< script src = "../gitbook/gitbook-plugin-search/search.js" > < / script >
< script src = "../gitbook/gitbook-plugin-lunr/lunr.min.js" > < / script >
< script src = "../gitbook/gitbook-plugin-lunr/search-lunr.js" > < / script >
< script src = "../gitbook/gitbook-plugin-sharing/buttons.js" > < / script >
< script src = "../gitbook/gitbook-plugin-fontsettings/fontsettings.js" > < / script >
< / body >
< / html >
