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< a href = "." > Route syntax< / a >
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< h1 id = "route-syntax" > Route Syntax< / h1 >
< p > Raw routes are defined as vectors, which have a String path, optional (non-sequential) route argument and optional child routes. Routes can be wrapped in vectors and lists and < code > nil< / code > routes are ignored. Paths can have path-parameters (< code > :id< / code > ) or catch-all-parameters (< code > *path< / code > ).< / p >
< p > Simple route:< / p >
< pre > < code class = "lang-clj" > [< span class = "hljs-string" > " /ping" < / span > ]
< / code > < / pre >
< p > Two routes:< / p >
< pre > < code class = "lang-clj" > [[< span class = "hljs-string" > " /ping" < / span > ]
[< span class = "hljs-string" > " /pong" < / span > ]]
< / code > < / pre >
< p > Routes with route arguments:< / p >
< pre > < code class = "lang-clj" > [[< span class = "hljs-string" > " /ping" < / span > < span class = "hljs-symbol" > ::ping< / span > ]
[< span class = "hljs-string" > " /pong" < / span > {< span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::pong< / span > }]]
< / code > < / pre >
< p > Routes with path parameters:< / p >
< pre > < code class = "lang-clj" > [[< span class = "hljs-string" > " /users/:user-id" < / span > ]
[< span class = "hljs-string" > " /api/:version/ping" < / span > ]]
< / code > < / pre >
< p > Route with catch-all parameter:< / p >
< pre > < code class = "lang-clj" > [< span class = "hljs-string" > " /public/*path" < / span > ]
< / code > < / pre >
< p > Nested routes:< / p >
< pre > < code class = "lang-clj" > [< span class = "hljs-string" > " /api" < / span >
[< span class = "hljs-string" > " /admin" < / span > {< span class = "hljs-symbol" > :middleware< / span > [< span class = "hljs-symbol" > ::admin< / span > ]}
[< span class = "hljs-string" > " " < / span > < span class = "hljs-symbol" > ::admin< / span > ]
[< span class = "hljs-string" > " /db" < / span > < span class = "hljs-symbol" > ::db< / span > ]]
[< span class = "hljs-string" > " /ping" < / span > < span class = "hljs-symbol" > ::ping< / span > ]]
< / code > < / pre >
< p > Same routes flattened:< / p >
< pre > < code class = "lang-clj" > [[< span class = "hljs-string" > " /api/admin" < / span > {< span class = "hljs-symbol" > :middleware< / span > [< span class = "hljs-symbol" > ::admin< / span > ], < span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::admin< / span > }]
[< span class = "hljs-string" > " /api/admin/db" < / span > {< span class = "hljs-symbol" > :middleware< / span > [< span class = "hljs-symbol" > ::admin< / span > ], < span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::db< / span > }]
[< span class = "hljs-string" > " /api/ping" < / span > {< span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::ping< / span > }]]
< / code > < / pre >
< p > As routes are just data, it' s easy to create them programamtically:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > defn< / span > < / span > cqrs-routes [actions dev-mode?]
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :interceptors< / span > [< span class = "hljs-symbol" > ::api< / span > < span class = "hljs-symbol" > ::db< / span > ]}
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > for< / span > < / span > [[type interceptor] actions
< span class = "hljs-symbol" > :let< / span > [path (< span class = "hljs-name" > < span class = "hljs-builtin-name" > str< / span > < / span > < span class = "hljs-string" > " /" < / span > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > name< / span > < / span > interceptor))
method (< span class = "hljs-name" > < span class = "hljs-builtin-name" > condp< / span > < / span > = type
< span class = "hljs-symbol" > :query< / span > < span class = "hljs-symbol" > :get< / span >
< span class = "hljs-symbol" > :command< / span > < span class = "hljs-symbol" > :post< / span > )]]
[path {method {< span class = "hljs-symbol" > :interceptors< / span > [interceptor]}}])
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > if< / span > < / span > dev-mode? [< span class = "hljs-string" > " /dev-tools" < / span > < span class = "hljs-symbol" > ::dev-tools< / span > ])])
< / code > < / pre >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > cqrs-routes< / span >
[[< span class = "hljs-symbol" > :query< / span > ' get-user]
[< span class = "hljs-symbol" > :command< / span > ' add-user]
[< span class = "hljs-symbol" > :command< / span > ' add-order]]
< span class = "hljs-literal" > false< / span > )
< span class = "hljs-comment" > ; [" /api" {:interceptors [::api ::db]}< / span >
< span class = "hljs-comment" > ; ([" /get-user" {:get {:interceptors [get-user]}}]< / span >
< span class = "hljs-comment" > ; [" /add-user" {:post {:interceptors [add-user]}}]< / span >
< span class = "hljs-comment" > ; [" /add-order" {:post {:interceptors [add-order]}}])< / span >
< span class = "hljs-comment" > ; nil]< / span >
< / code > < / pre >
< h1 id = "router" > Router< / h1 >
< p > Routes are just data and to do actual routing, we need a Router satisfying the < code > reitit.core/Router< / code > protocol. Routers are created with < code > reitit.core/router< / code > function, taking the raw routes and optionally an options map. Raw routes gets expanded and optionally coerced and compiled.< / p >
< p > < code > Router< / code > protocol:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > defprotocol< / span > < / span > Router
(< span class = "hljs-name" > router-name< / span > [this])
(< span class = "hljs-name" > routes< / span > [this])
(< span class = "hljs-name" > options< / span > [this])
(< span class = "hljs-name" > route-names< / span > [this])
(< span class = "hljs-name" > match-by-path< / span > [this path])
(< span class = "hljs-name" > match-by-name< / span > [this name] [this name params]))
< / code > < / pre >
< p > Creating a router:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [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" > " /api" < / span >
[< span class = "hljs-string" > " /ping" < / span > < span class = "hljs-symbol" > ::ping< / span > ]
[< span class = "hljs-string" > " /user/:id" < / span > < span class = "hljs-symbol" > ::user< / span > ]]]))
< / code > < / pre >
< p > Router flattens the raw routes and expands the route arguments using < code > reitit.core/Expand< / code > protocol. By default, < code > Keyword< / code > s are expanded to < code > :name< / code > and functions are expaned to < code > :handler< / code > . < code > nil< / code > routes are removed. The expanded routes can be retrieved with router:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/routes< / span > router)
< span class = "hljs-comment" > ; [[" /api/ping" {:name :user/ping}]< / span >
< span class = "hljs-comment" > ; [" /api/user/:id" {:name :user/user}]]< / span >
< / code > < / pre >
< 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 >
< li > < code > PartialMatch< / code > , path matched, missing path-parameters (only in reverse-routing)< / li >
< li > < code > Match< / code > , exact match< / li >
< / ul >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-path< / span > router < span class = "hljs-string" > " /hello" < / span > )
< span class = "hljs-comment" > ; nil< / span >
< / code > < / pre >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-path< / span > router < span class = "hljs-string" > " /api/user/1" < / span > )
< span class = "hljs-comment" > ; #Match{:template " /api/user/:id" < / span >
< span class = "hljs-comment" > ; :meta {:name :user/user}< / span >
< span class = "hljs-comment" > ; :path " /api/user/1" < / span >
< span class = "hljs-comment" > ; :result nil< / span >
< span class = "hljs-comment" > ; :params {:id " 1" }}< / span >
< / code > < / pre >
< h2 id = "name-based-routing" > Name-based routing< / h2 >
< p > All routes which < code > :name< / code > route data defined, can be matched by name.< / p >
< p > Listing all route names:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/route-names< / span > router)
< span class = "hljs-comment" > ; [:user/ping :user/user]< / span >
< / code > < / pre >
< p > Matching by name:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-name< / span > router < span class = "hljs-symbol" > ::user< / span > )
< span class = "hljs-comment" > ; #PartialMatch{:template " /api/user/:id" ,< / span >
< span class = "hljs-comment" > ; :meta {:name :user/user},< / span >
< span class = "hljs-comment" > ; :result nil,< / span >
< span class = "hljs-comment" > ; :params nil,< / span >
< span class = "hljs-comment" > ; :required #{:id}}< / span >
(< span class = "hljs-name" > r/partial-match?< / span > (< span class = "hljs-name" > r/match-by-name< / span > router < span class = "hljs-symbol" > ::user< / span > ))
< span class = "hljs-comment" > ; true< / span >
< / code > < / pre >
< p > We only got a partial match as we didn' t provide the needed path-parameters. Let' s provide the them too:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-name< / span > router < span class = "hljs-symbol" > ::user< / span > {< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 1" < / span > })
< span class = "hljs-comment" > ; #Match{:template " /api/user/:id" < / span >
< span class = "hljs-comment" > ; :meta {:name :user/user}< / span >
< span class = "hljs-comment" > ; :path " /api/user/1" < / span >
< span class = "hljs-comment" > ; :result nil< / span >
< span class = "hljs-comment" > ; :params {:id " 1" }}< / span >
< / code > < / pre >
< p > There is also a exception throwing version:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-name!< / span > router < span class = "hljs-symbol" > ::user< / span > )
< span class = "hljs-comment" > ; ExceptionInfo missing path-params for route /api/user/:id: #{:id}< / span >
< / code > < / pre >
< h1 id = "route-data" > Route data< / h1 >
< p > Routes can have arbitrary meta-data, interpreted by the router (via it' s < code > :compile< / code > hook) or the application itself. For nested routes, route data is accumulated recursively using < a href = "https://github.com/weavejester/meta-merge" target = "_blank" > meta-merge< / a > . By default, it appends collections, but it can be overridden to do < code > :prepend< / code > , < code > :replace< / code > or < code > :displace< / code > .< / p >
< p > An example router with nested data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > router
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :interceptors< / span > [< span class = "hljs-symbol" > ::api< / span > ]}
[< span class = "hljs-string" > " /ping" < / span > < span class = "hljs-symbol" > ::ping< / span > ]
[< span class = "hljs-string" > " /admin" < / span > {< span class = "hljs-symbol" > :roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }}
[< span class = "hljs-string" > " /users" < / span > < span class = "hljs-symbol" > ::users< / span > ]
[< span class = "hljs-string" > " /db" < / span > {< span class = "hljs-symbol" > :interceptors< / span > [< span class = "hljs-symbol" > ::db< / span > ]
< span class = "hljs-symbol" > :roles< / span > ^< span class = "hljs-symbol" > :replace< / span > #{< span class = "hljs-symbol" > :db-admin< / span > }}
[< span class = "hljs-string" > " /:db" < / span > {< span class = "hljs-symbol" > :parameters< / span > {< span class = "hljs-symbol" > :db< / span > String}}
[< span class = "hljs-string" > " /drop" < / span > < span class = "hljs-symbol" > ::drop-db< / span > ]
[< span class = "hljs-string" > " /stats" < / span > < span class = "hljs-symbol" > ::db-stats< / span > ]]]]]))
< / code > < / pre >
< p > Resolved route tree:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > reitit/routes< / span > router)
< span class = "hljs-comment" > ; [[" /api/ping" {:interceptors [::api]< / span >
< span class = "hljs-comment" > ; :name ::ping}]< / span >
< span class = "hljs-comment" > ; [" /api/admin/users" {:interceptors [::api]< / span >
< span class = "hljs-comment" > ; :roles #{:admin}< / span >
< span class = "hljs-comment" > ; :name ::users}]< / span >
< span class = "hljs-comment" > ; [" /api/admin/db/:db/drop" {:interceptors [::api ::db]< / span >
< span class = "hljs-comment" > ; :roles #{:db-admin}< / span >
< span class = "hljs-comment" > ; :parameters {:db String}< / span >
< span class = "hljs-comment" > ; :name ::drop-db}]< / span >
< span class = "hljs-comment" > ; [" /api/admin/db/:db/stats" {:interceptors [::api ::db]< / span >
< span class = "hljs-comment" > ; :roles #{:db-admin}< / span >
< span class = "hljs-comment" > ; :parameters {:db String}< / span >
< span class = "hljs-comment" > ; :name ::db-stats}]]< / span >
< / code > < / pre >
< p > Route data is returned with < code > Match< / code > and the application can act based on it.< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-path< / span > router < span class = "hljs-string" > " /api/admin/db/users/drop" < / span > )
< span class = "hljs-comment" > ; #Match{:template " /api/admin/db/:db/drop" < / span >
< span class = "hljs-comment" > ; :meta {:interceptors [::api ::db]< / span >
< span class = "hljs-comment" > ; :roles #{:db-admin}< / span >
< span class = "hljs-comment" > ; :parameters {:db String}< / span >
< span class = "hljs-comment" > ; :name ::drop-db}< / span >
< span class = "hljs-comment" > ; :result nil< / span >
< span class = "hljs-comment" > ; :params {:db " users" }< / span >
< span class = "hljs-comment" > ; :path " /api/admin/db/users/drop" }< / span >
< / code > < / pre >
< h1 id = "different-routers" > Different Routers< / h1 >
< p > Reitit ships with several different implementations for the < code > Router< / code > protocol, originally based on the awesome < a href = "https://github.com/pedestal/pedestal/tree/master/route" target = "_blank" > Pedestal< / a > implementation. < code > router< / code > selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using < code > :router< / code > ROUTER OPTION.< / p >
< table >
< thead >
< tr >
< th > router< / th >
< th > description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > < code > :linear-router< / code > < / td >
< td > Matches the routes one-by-one starting from the top until a match is found. Works with any kind of routes.< / td >
< / tr >
< tr >
< td > < code > :lookup-router< / code > < / td >
< td > Fastest router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters.< / td >
< / tr >
< tr >
< td > < code > :mixed-router< / code > < / td >
< td > Creates internally a < code > :linear-router< / code > and a < code > :lookup-router< / code > and used them to effectively get best-of-both-worlds. Valid if there are no CONFLICTING ROUTES.< / td >
< / tr >
< tr >
< td > < code > :prefix-tree-router< / code > < / td >
< td > < a href = "https://github.com/julienschmidt/httprouter#how-does-it-work" target = "_blank" > TODO< / a > < / td >
< / tr >
< / tbody >
< / table >
< p > The router name can be asked from the router< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/router-name< / span > router)
< span class = "hljs-comment" > ; :mixed-router< / span >
< / code > < / pre >
< / 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 >
< a href = "basics.html#router" class = "navigation navigation-next navigation-unique" aria-label = "Next page: Router" >
< i class = "fa fa-angle-right" > < / i >
< / a >
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