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Ring-router
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Reverse-routing
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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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Pluggable Coercion
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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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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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< h1 id = "middleware-registry" > Middleware Registry< / h1 >
< p > The < code > :middleware< / code > syntax in < code > reitit-ring< / code > supports also Keywords. Keywords are looked from Middleware Registry, which is a map of < code > keyword => IntoMiddleware< / code > . Middleware registry should be stored under key < code > :reitit.middleware/registry< / code > in the router options. If a middleware keyword isn' t found in the registry, router creation fails fast with descriptive error message.< / p >
< h2 id = "examples" > Examples< / h2 >
< p > Application using middleware defined in the Middleware Registry:< / 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" > require< / span > ' [reitit.middleware < span class = "hljs-symbol" > :as< / span > middleware])
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > defn< / span > < / span > wrap-bonus [handler value]
(< 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" > :bonus< / span > (< span class = "hljs-name" > fnil< / span > + < span class = "hljs-number" > 0< / span > ) value))))
(< 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 > [[< span class = "hljs-symbol" > :bonus< / span > < span class = "hljs-number" > 20< / span > ]]}
[< span class = "hljs-string" > " /bonus" < / span > {< span class = "hljs-symbol" > :middleware< / span > [< span class = "hljs-symbol" > :bonus10< / span > ]
< span class = "hljs-symbol" > :get< / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span > [{< span class = "hljs-symbol" > :keys< / span > [bonus]}]
{< span class = "hljs-symbol" > :status< / span > < span class = "hljs-number" > 200< / span > , < span class = "hljs-symbol" > :body< / span > {< span class = "hljs-symbol" > :bonus< / span > bonus}})}]]
{< span class = "hljs-symbol" > ::middleware/registry< / span > {< span class = "hljs-symbol" > :bonus< / span > wrap-bonus
< span class = "hljs-symbol" > :bonus10< / span > [< span class = "hljs-symbol" > :bonus< / span > < span class = "hljs-number" > 10< / span > ]}})))
< / code > < / pre >
< p > Works as expected:< / 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/bonus" < / span > })
< span class = "hljs-comment" > ; {:status 200, :body {:bonus 30}}< / span >
< / code > < / pre >
< p > Router creation fails fast if registry doesn' t contain the Middleware:< / p >
< pre > < code class = "lang-clj" > (< 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 > [[< span class = "hljs-symbol" > :bonus< / span > < span class = "hljs-number" > 20< / span > ]]}
[< span class = "hljs-string" > " /bonus" < / span > {< span class = "hljs-symbol" > :middleware< / span > [< span class = "hljs-symbol" > :bonus10< / span > ]
< span class = "hljs-symbol" > :get< / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span > [{< span class = "hljs-symbol" > :keys< / span > [bonus]}]
{< span class = "hljs-symbol" > :status< / span > < span class = "hljs-number" > 200< / span > , < span class = "hljs-symbol" > :body< / span > {< span class = "hljs-symbol" > :bonus< / span > bonus}})}]]
{< span class = "hljs-symbol" > ::middleware/registry< / span > {< span class = "hljs-symbol" > :bonus< / span > wrap-bonus}})))
< span class = "hljs-comment" > ;CompilerException clojure.lang.ExceptionInfo: Middleware :bonus10 not found in registry.< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ;Available middleware in registry:< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ;| :id | :description |< / span >
< span class = "hljs-comment" > ;|--------+--------------------------------------|< / span >
< span class = "hljs-comment" > ;| :bonus | reitit.ring_test$wrap_bonus@59fddabb |< / span >
< / code > < / pre >
< h2 id = "when-to-use-the-registry" > When to use the registry?< / h2 >
< p > Middleware as Keywords helps to keep the routes (all but handlers) as literal data (e.g. data that evaluates to itself) enabling the routes to be persisted in external formats like EDN-files and databases. Duct is a good example where the < a href = "https://github.com/duct-framework/duct/wiki/Configuration" target = "_blank" > middleware can be referenced from EDN-files< / a > . It should be easy to make Duct configuration a Middleware Registry in < code > reitit-ring< / code > .< / p >
< p > The bad thing it' s an extra indirection, making things more complex and removed the default IDE-support of " goto definition" or " look source" .< / p >
< h2 id = "todo" > TODO< / h2 >
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< li > a prefilled registry of common middleware in the < code > reitit-middleware< / code > < / li >
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