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< li class = "header" > Introduction< / li >
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Introduction
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Route Syntax
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Router
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Path-based Routing
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Name-based Routing
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Route Data
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Route Data Validation
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Route Conflicts
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Coercion Explained
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Plumatic Schema
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Clojure.spec
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Data-specs
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Ring-router
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Reverse-routing
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Default handler
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Static Resources
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Dynamic Extensions
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Data-driven Middleware
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< a href = "transforming_middleware_chain.html" >
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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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Swagger Support
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RESTful form methods
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Interceptors
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Pedestal
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Sieppari
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Default Interceptors
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Transforming Interceptor Chain
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Basics
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Browser integration
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Controllers
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< a href = "../advanced/configuring_routers.html" >
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Configuring Routers
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< a href = "../advanced/composing_routers.html" >
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Composing Routers
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< a href = "../advanced/different_routers.html" >
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Different Routers
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< a href = "../advanced/route_validation.html" >
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Route Validation
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< a href = "../advanced/dev_workflow.html" >
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Dev Workflow
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< a href = "../advanced/shared_routes.html" >
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Shared Routes
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Performance
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Development Instructions
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<!-- Title -->
< h1 >
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< a href = ".." > Data-driven Middleware< / a >
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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 >
< 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 >
< 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 >
< thead >
< tr >
< th > key< / th >
< th > description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > < code > :name< / code > < / td >
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< td > Name of the middleware as a qualified keyword< / td >
< / tr >
< tr >
< td > < code > :spec< / code > < / td >
< 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 >
< tr >
< td > < code > :wrap< / code > < / td >
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< td > The actual middleware function of < code > handler & args => request => response< / code > < / td >
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< / tr >
< tr >
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< td > < code > :compile< / code > < / td >
< td > Middleware compilation function, see < a href = "compiling_middleware.html" > compiling middleware< / a > .< / td >
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< / tr >
< / tbody >
< / 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 >
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< h3 id = "creating-middleware" > Creating Middleware< / h3 >
< p > The following produce identical middleware runtime function.< / p >
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< h3 id = "function" > Function< / h3 >
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< 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 >
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< 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 >
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< 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])
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(< 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 >
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< span class = "hljs-symbol" > :description< / span > < span class = "hljs-string" > " Middleware that does things." < / span >
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< span class = "hljs-symbol" > :wrap< / span > wrap}))
< / code > < / pre >
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< h2 id = "using-middleware" > Using Middleware< / h2 >
< p > < code > :middleware< / code > is merged to endpoints by the < code > router< / code > .< / p >
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< 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}}]])))
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< / code > < / pre >
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< p > All the middleware are applied correctly:< / p >
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< 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 >
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< 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 >
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< h2 id = "ideas-for-the-future" > Ideas for the future< / h2 >
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< 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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