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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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< li class = "header" > Ring< / li >
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< a href = "ring.html" >
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Ring-router
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Reverse-routing
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Default handler
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Slash 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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< a href = "middleware_registry.html" >
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Middleware Registry
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< a href = "default_middleware.html" >
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Default Middleware
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Pluggable Coercion
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< a href = "route_data_validation.html" >
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Route Data Validation
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Compiling Middleware
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Swagger Support
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< a href = "../http/interceptors.html" >
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Interceptors
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< a href = "../http/pedestal.html" >
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Pedestal
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Sieppari
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Default Interceptors
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Basics
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Browser integration
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Controllers
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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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Different Routers
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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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Shared Routes
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Performance
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Development Instructions
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< a href = ".." > Compiling Middleware< / a >
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< h1 id = "compiling-middleware" > Compiling Middleware< / h1 >
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< p > The < a href = "dynamic_extensions.html" > dynamic extensions< / a > is a easy way to extend the system. To enable fast lookups into route data, we can compile them into any shape (records, functions etc.) we want, enabling fast access at request-time.< / p >
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< p > But, we can do much better. As we know the exact route that middleware/interceptor is linked to, we can pass the (compiled) route information into the middleware at creation-time. It can do local reasoning: extract and transform relevant data just for it and pass the optimized data into the actual request-handler via a closure - yielding much faster runtime processing. Middleware can also decide not to mount itself by returning < code > nil< / code > . Why mount a < code > wrap-enforce-roles< / code > middleware for a route if there are no roles required for it?< / p >
< p > To enable this we use < a href = "data_driven_middleware.html" > middleware records< / a > < code > :compile< / code > key instead of the normal < code > :wrap< / code > . < code > :compile< / code > expects a function of < code > route-data router-opts => ?IntoMiddleware< / code > .< / p >
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< p > To demonstrate the two approaches, below are response coercion middleware written as normal ring middleware function and as middleware record with < code > :compile< / code > .< / p >
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< h2 id = "normal-middleware" > Normal Middleware< / h2 >
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< ul >
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< li > Reads the compiled route information on every request. Everything is done at request-time.< / li >
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< / ul >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > defn< / span > < / span > wrap-coerce-response
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< span class = "hljs-string" > " Middleware for pluggable response coercion.
Expects a :coercion of type `reitit.coercion/Coercion`
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and :responses from route data, otherwise will do nothing." < / span >
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[handler]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span >
([request]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > let< / span > < / span > [response (< span class = "hljs-name" > handler< / span > request)
method (< span class = "hljs-symbol" > :request-method< / span > request)
match (< span class = "hljs-name" > ring/get-match< / span > request)
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responses (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > match < span class = "hljs-symbol" > :result< / span > method < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :responses< / span > )
coercion (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > match < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :coercion< / span > )
opts (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > match < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :opts< / span > )]
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > if< / span > < / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > and< / span > < / span > coercion responses)
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > let< / span > < / span > [coercers (< span class = "hljs-name" > response-coercers< / span > coercion responses opts)]
(< span class = "hljs-name" > coerce-response< / span > coercers request response))
response)))
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([request respond raise]
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > let< / span > < / span > [method (< span class = "hljs-symbol" > :request-method< / span > request)
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match (< span class = "hljs-name" > ring/get-match< / span > request)
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responses (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > match < span class = "hljs-symbol" > :result< / span > method < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :responses< / span > )
coercion (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > match < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :coercion< / span > )
opts (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > match < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :opts< / span > )]
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > if< / span > < / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > and< / span > < / span > coercion responses)
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > let< / span > < / span > [coercers (< span class = "hljs-name" > response-coercers< / span > coercion responses opts)]
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(< span class = "hljs-name" > handler< / span > request #(< span class = "hljs-name" > respond< / span > (< span class = "hljs-name" > coerce-response< / span > coercers request %))))
(< span class = "hljs-name" > handler< / span > request respond raise))))))
< / code > < / pre >
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< h2 id = "compiled-middleware" > Compiled Middleware< / h2 >
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< ul >
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< li > Route information is provided at creation-time< / li >
< li > Coercers are compiled at creation-time< / li >
< li > Middleware mounts only if < code > :coercion< / code > and < code > :responses< / code > are defined for the route< / li >
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< li > Also defines spec for the route data < code > :responses< / code > for the < a href = "route_data_validation.html" > route data validation< / a > .< / li >
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< / ul >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.spec < span class = "hljs-symbol" > :as< / span > rs])
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > coerce-response-middleware
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< span class = "hljs-string" > " Middleware for pluggable response coercion.
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Expects a :coercion of type `reitit.coercion/Coercion`
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and :responses from route data, otherwise does not mount." < / span >
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{< span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::coerce-response< / span >
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< span class = "hljs-symbol" > :spec< / span > < span class = "hljs-symbol" > ::rs/responses< / span >
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< span class = "hljs-symbol" > :compile< / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span > [{< span class = "hljs-symbol" > :keys< / span > [coercion responses]} opts]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > if< / span > < / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > and< / span > < / span > coercion responses)
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > let< / span > < / span > [coercers (< span class = "hljs-name" > coercion/response-coercers< / span > coercion responses opts)]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span > [handler]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > fn< / span > < / span >
([request]
(< span class = "hljs-name" > coercion/coerce-response< / span > coercers request (< span class = "hljs-name" > handler< / span > request)))
([request respond raise]
(< span class = "hljs-name" > handler< / span > request #(< span class = "hljs-name" > respond< / span > (< span class = "hljs-name" > coercion/coerce-response< / span > coercers request %)) raise)))))))})
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< / code > < / pre >
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< p > It has 50% less code, it' s much easier to reason about and is much faster.< / p >
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< / section >
< / div >
< div class = "search-results" >
< div class = "has-results" >
< h1 class = "search-results-title" > < span class = 'search-results-count' > < / span > results matching "< span class = 'search-query' > < / span > "< / h1 >
< ul class = "search-results-list" > < / ul >
< / div >
< div class = "no-results" >
< h1 class = "search-results-title" > No results matching "< span class = 'search-query' > < / span > "< / h1 >
< / div >
< / div >
< / div >
< / div >
< / div >
< / div >
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< a href = "route_data_validation.html" class = "navigation navigation-prev " aria-label = "Previous page: Route Data Validation" >
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< i class = "fa fa-angle-left" > < / i >
< / a >
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< a href = "swagger.html" class = "navigation navigation-next " aria-label = "Next page: Swagger Support" >
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< i class = "fa fa-angle-right" > < / i >
< / a >
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< / div >
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