{"id":16405570,"url":"https://github.com/weavejester/ataraxy","last_synced_at":"2025-04-04T16:17:11.454Z","repository":{"id":2955414,"uuid":"47996182","full_name":"weavejester/ataraxy","owner":"weavejester","description":"A data-driven Ring routing and destructuring library","archived":false,"fork":false,"pushed_at":"2022-06-19T23:09:56.000Z","size":125,"stargazers_count":209,"open_issues_count":7,"forks_count":13,"subscribers_count":12,"default_branch":"master","last_synced_at":"2024-10-18T09:21:11.868Z","etag":null,"topics":["clojure","data-driven","ring","routing"],"latest_commit_sha":null,"homepage":"","language":"Clojure","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"epl-1.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/weavejester.png","metadata":{"files":{"readme":"README.md","changelog":"CHANGELOG.md","contributing":"CONTRIBUTING.md","funding":null,"license":"LICENSE.html","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2015-12-14T19:22:02.000Z","updated_at":"2024-08-23T14:44:59.000Z","dependencies_parsed_at":"2022-09-20T22:00:30.731Z","dependency_job_id":null,"html_url":"https://github.com/weavejester/ataraxy","commit_stats":null,"previous_names":[],"tags_count":17,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/weavejester%2Fataraxy","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/weavejester%2Fataraxy/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/weavejester%2Fataraxy/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/weavejester%2Fataraxy/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/weavejester","download_url":"https://codeload.github.com/weavejester/ataraxy/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":247208190,"owners_count":20901570,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["clojure","data-driven","ring","routing"],"created_at":"2024-10-11T06:06:29.731Z","updated_at":"2025-04-04T16:17:11.436Z","avatar_url":"https://github.com/weavejester.png","language":"Clojure","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Ataraxy\n\n[![Build Status](https://travis-ci.org/weavejester/ataraxy.svg?branch=master)](https://travis-ci.org/weavejester/ataraxy)\n\nA data-driven routing and destructuring library for [Ring][]. This\nlibrary is still being developed, so some functionality may change\nbefore we hit version 1.0.0.\n\n[ring]: https://github.com/ring-clojure/ring\n\n## Rationale\n\nThere are several data-driven routing libraries for Ring, such as\n[bidi][], [Silk][] and [gudu][]. Ataraxy differs from them because\nit not only seeks to match a route, it also destructures the\nincoming request.\n\nIn this sense it is similar to [Compojure][], in that the idea is to\nremove extraneous information. However, while Compojure is designed to\nuse chains of functions, Ataraxy defines its functionality through a\ndeclarative data structure.\n\n[bidi]: https://github.com/juxt/bidi\n[silk]: https://github.com/DomKM/silk\n[gudu]: https://github.com/thatismatt/gudu\n[compojure]: https://github.com/weavejester/compojure\n\n\n## Example\n\n```clojure\n{[\"/api\" {uid :identity}]\n {\"/products\"\n   {[:get]                [:products/list uid]\n    [:get \"/\" pid]        [:products/get uid ^uuid pid]\n    [:get \"/search\" #{q}] [:products/search uid q]\n    [:post {body :body}]  [:products/new uid body]}}}\n```\n\n\n## Installation\n\nAdd the following dependency to your `project.clj` file:\n\n    [ataraxy \"0.4.3\"]\n\n\n## Routing\n\nAtaraxy uses a data structure to tell it how to route and destructure\nrequests. See the following section on [syntax](#syntax) for details.\n\n```clojure\n(def routes '{\"/foo\" [:foo]})\n```\n\nWe can match a request map to a result with `matches`:\n\n```clojure\n(require '[ataraxy.core :as ataraxy])\n\n(ataraxy/matches routes {:uri \"/foo\"})\n=\u003e [:foo]\n```\n\nIf Ataraxy cannot correctly match any route, then an error result from\nthe `ataraxy.error` namespace is returned. For example:\n\n```clojure\n(ataraxy/matches routes {:uri \"/bar\"})\n=\u003e [:ataraxy.error/unmatched-path]\n```\n\nSee the [errors](#errors) section for more details.\n\nFor performance, we can also pre-compile the routing data:\n\n```clojure\n(def compiled-routes (ataraxy/compile routes))\n```\n\nThe resulting object can be used in `matches` in the same way as the\nraw data structure:\n\n```clojure\n(ataraxy/matches compiled-routes {:uri \"/foo\"})\n=\u003e [:foo]\n```\n\n\n## Handlers\n\nOnce we have our routes, it's likely we want to turn them into a Ring\nhandler function. Ataraxy has a function called `handler` for this\npurpose:\n\n```clojure\n(defn foo [request]\n  {:status 200, :headers {}, :body \"Foo\"})\n\n(def handler\n  (ataraxy/handler\n   {:routes   routes\n    :handlers {:foo foo}}))\n```\n\nThis function takes a map with four keys:\n\n* `:routes`     - the routes to match\n* `:handlers`   - a map of result keys to Ring handlers\n* `:middleware` - a map of metadata keys to Ring middleware (optional)\n* `:coercers`   - a map of symbols to coercer functions (optional)\n\nThe handler function is chosen by the key of the result. Two keys are\nadded to the request map passed to the handler:\n\n* `:ataraxy/result` - contains the matched result\n* `:route-params`   - a map of parameters matched in the path\n                      (included for compatibility)\n\nThe handler can also return a result vector instead of a request\nmap. Each vector that is returned is checked against the handler map,\nuntil eventually a Ring response map is returned.\n\nThe `ataraxy.response` namespace defines a number of responses on\nthe default handler, allowing for code like this:\n\n```clojure\n(require '[ataraxy.response :as response])\n\n(defn hello [{[_ name] :ataraxy/result}]\n  [::response/ok (str \"Hello \" name)])\n\n(def handler\n  (ataraxy/handler\n    {:routes   '{[:get \"/hello/\" name] [:hello name]}\n     :handlers {:hello hello}}))\n```\n\nThe default handler is set to `ataraxy.handler/default`, but can be\nchanged by adding a handler to the `:default` key of the handler map.\n\nMiddleware is chosen based on the metadata that is applied to the\nresult or to the containing routing table. For example:\n\n```clojure\n(defn wrap-example [handler value]\n  (fn [request]\n    (let [response (handler request)]\n      (assoc-in response [:header \"X-Example\"] value))))\n\n(def handler\n  (ataraxy/handler\n   {:routes     {\"/foo\" ^:example [:foo]}\n    :handlers   {:foo foo}\n    :middleware {:example #(wrap-example % \"test\")}}))\n```\n\nThis would add an `X-Example` header to the response of the\nhandler. We can also pass an argument to the handler by setting the\n`:example` metadata key to something other than `true`:\n\n```clojure\n(def handler\n  (ataraxy/handler\n   {:routes     {\"/foo\" ^{:example \"test\"} [:foo]}\n    :handlers   {:foo foo}\n    :middleware {:example wrap-example}}))\n```\n\nCustom coercers can be added to the handler by specifying the\n`:coercers` option. This is described in more detail in\nthe [coercers](#coercers) section.\n\n\n## Syntax\n\nAtaraxy generates routes from a **routing table**, which is a Clojure\nmap, or a list of alternating keys and values.\n\nThe keys of the table are **routes**, and the data type used defines a\nway of matching and destructuring a request.\n\nThe values are either **results** or nested tables.\n\nHere's a semi-formal definition of the syntax:\n\n```\ntable  = {\u003croute result\u003e+} | (\u003croute result\u003e+)\nroute  = keyword | string | symbol | set | map | [route+]\nresult = table | [keyword symbol*]\n```\n\n### Results\n\nResults are always vectors, beginning with a keyword, followed by zero\nor more symbols. For example:\n\n```clojure\n[:foo id]\n```\n\nResults are paired with routes:\n\n```clojure\n{[\"/foo/\" id] [:foo id]}\n```\n\nThe symbols in the route are passed into the result.\n\nThe symbols in the result may be tagged with a type they should be\ncoerced into. For example:\n\n```clojure\n[:foo ^int id]\n```\n\nSee the [coercers](#coercers) section for more detail.\n\n### Keyword routes\n\nA keyword will match the request method. For example:\n\n```clojure\n{:get [:foo]})\n```\n\nThis route will match any request with the GET method.\n\n### String routes\n\nA string will match the `:path-info` or `:uri` key on the request. For\nexample:\n\n```clojure\n{\"/foo\" [:foo]\n \"/bar\" [:bar]}\n```\n\nThis example will match the URIs \"/foo\" and \"/bar\".\n\n### Symbol routes\n\nLike strings, symbols match against the `:path-info` or `:uri` key on\nthe request. Unlike strings, they match on a regular expression, and\nbind the string matched by the regular expression to the symbol.\n\nBy default the regex used is `[^/]+`. In other words, any character\nexcept a forward slash. The regex can be changed by adding a `:re` key\nto the symbol's metadata. For example:\n\n```clojure\n{^{:re #\"/d.g\"} w [:word w]}\n```\n\nThis will match URIs like \"/dog\", \"/dig\" and \"/dug\", and add the\nmatched word to the result.\n\n### Set routes\n\nA set of symbols will match URL-encoded parameters of the same name.\nFor example:\n\n```clojure\n{#{q} [:query q]}\n```\n\nThis will match any request with `q` as a parameter. For example,\n\"/search?q=foo\".\n\nIn order to match query parameters, the request map needs a\n`:query-params` key, which is supplied by the [wrap-params][]\nmiddleware in Ring.\n\nBy default, the parameters must be set for the route to match. If you\nwant the parameters to be optional, you can prefix them with a \"?\".\n\n```clojure\n{#{?q} [:query ?q]}\n```\n\nThis works the same as the previous example, except that the route\nstill matches if `q` is `nil`.\n\n[wrap-params]: https://ring-clojure.github.io/ring/ring.middleware.params.html#var-wrap-params\n\n### Map routes\n\nA map will destructure the request. Any destructured symbol must not\nbe `nil` for the route to match. For example:\n\n```clojure\n{{{:keys [user]} :session} [:user user]}\n```\n\nThis route will match any request map with a `:user` key in the\nsession.\n\nAs with set routes, symbols prefixed with a \"?\" are considered\noptional and may be `nil`.\n\n\n### Vector routes\n\nA vector combines the behavior of multiple routing rules. For example:\n\n```clojure\n{[:get \"/foo\"] [:foo]}\n```\n\nThis will match both the request method and the URI.\n\nStrings and symbols will be combined in order, to allow complex paths\nto be matched. For example:\n\n```clojure\n{[:get \"/user/\" name \"/info\"] [:get-user-info name]}\n```\n\nThis will match URIs like \"/user/alice/info\" and pass the name \"alice\"\nto the result.\n\n### Nested tables\n\nNesting routing tables is an alternative way of combining routes.\nInstead of a result vector, a map or list may be specified. For\nexample:\n\n```clojure\n{\"/foo\"\n {\"/bar\" [:foobar]\n  \"/baz\" [:foobaz]}})\n```\n\nThis will match the URIs \"/foo/bar\" and \"/foo/baz\".\n\nYou can also use nesting and vectors together:\n\n```clojure\n{[\"/user/\" name]\n {:get [:get-user name]\n  :put [:put-user name]}}\n```\n\n\n## Errors\n\nWhen something goes wrong, Ataraxy returns one of the following error\nresults:\n\n* `:ataraxy.error/unmatched-path`\n* `:ataraxy.error/unmatched-method`\n* `:ataraxy.error/missing-params`\n* `:ataraxy.error/missing-destruct`\n* `:ataraxy.error/failed-coercions`\n* `:ataraxy.error/failed-spec`\n\nIf you're using the `ataraxy.core/handler` function, these are\nautomatically converted into appropriate Ring response maps. However,\nit's generally worth customizing the error responses to the needs of\nyour application.\n\n\n## Coercers\n\nCoercers are functions that turn a string into a custom type. Any\nsymbol in the result can be tagged with a symbol associated with a\ncoercer function.\n\nFor example, it's common to want to change a parameter from a string\ninto an int:\n\n```clojure\n{[:get \"/foo/\" id] [:foo ^int id]}\n```\n\nThe `int` and `uuid` coercers are included by default. We can easily\nadd our own, however:\n\n```clojure\n(defn -\u003efloat [s]\n  (try (Double/parseDouble s) (catch NumberFormatException _)))\n\n(def compiled-routes\n  (ataraxy/compile\n   '{[:get \"/foo/\" id] [:foo ^float id]}\n   {'float -\u003efloat}))\n```\n\nAnd similarly to handlers:\n\n```clojure\n(def handler\n  (ataraxy/handler\n   {:routes   '{[:get \"/foo/\" id] [:foo ^float id]}\n    :coercers {'float -\u003efloat}}))\n```\n\n\n## Specs\n\nResults are validated via the `:ataraxy/result` spec. This is a\nmulti-spec that dispatches off the key, and can be assigned behavior\nthrough the `result-spec` multimethod.\n\nFor example:\n\n```clojure\n(require '[clojure.spec.alpha :as s])\n\n(defmethod ataraxy/result-spec ::foo [_]\n  (s/cat :key any? :id nat-int?))\n```\n\nThis ensures that any result with `::foo` as the key must have exactly\ntwo elements, with the second being a natural number.\n\nIf a spec fails, then a `:ataraxy.error/failed-spec` result is\nreturned, which if left alone resolves to a 400 \"Bad Request\"\nresponse in the handler.\n\n\n## License\n\nCopyright © 2022 James Reeves\n\nDistributed under the Eclipse Public License either version 1.0 or (at\nyour option) any later version.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fweavejester%2Fataraxy","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fweavejester%2Fataraxy","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fweavejester%2Fataraxy/lists"}