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Add http-kit example (#8)
* Add http-kit example * Make http-kit example runnable like the jetty example
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‎examples/hello-httpkit/README.md

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# A Datastar + http-kit starter
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## Running the example
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- repl:
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```
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clojure -M:repl -m nrepl.cmdline --middleware "[cider.nrepl/cider-middleware]"
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```
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- main:
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```
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clojure -M -m hello-httpkit
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```

‎examples/hello-httpkit/deps.edn

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{:paths ["src" "resources"]
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:deps {com.cnuernber/charred {:mvn/version "1.034"}
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dev.data-star.clojure/http-kit {:local/root "../../sdk-adapter-http-kit"}
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dev.data-star.clojure/sdk {:local/root "../../sdk"}
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dev.onionpancakes/chassis {:mvn/version "1.0.365"}
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http-kit/http-kit {:mvn/version "2.8.1"}
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metosin/reitit {:mvn/version "0.7.2"}}
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:aliases
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{:repl {:extra-deps {org.clojure/clojure {:mvn/version "1.12.0"}
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nrepl/nrepl {:mvn/version "1.3.0"}
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cider/cider-nrepl {:mvn/version "0.50.2"}}}}}

‎examples/hello-httpkit/resources/hello-world.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Datastar SDK Demo</title>
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<script src="https://unpkg.com/@tailwindcss/browser@4"></script>
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<script type="module" src="https://cdn.jsdelivr.net/gh/starfederation/datastar@main/bundles/datastar.js"></script>
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</head>
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<body class="bg-white dark:bg-gray-900 text-lg max-w-xl mx-auto my-16">
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<div data-signals-delay="400" class="bg-white dark:bg-gray-800 text-gray-500 dark:text-gray-400 rounded-lg px-6 py-8 ring shadow-xl ring-gray-900/5 space-y-2">
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<div class="flex justify-between items-center">
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<h1 class="text-gray-900 dark:text-white text-3xl font-semibold">
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Datastar SDK Demo
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</h1>
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<img src="https://data-star.dev/static/images/rocket-64x64.png" alt="Rocket" width="64" height="64"/>
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</div>
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<p class="mt-2">
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SSE events will be streamed from the backend to the frontend.
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</p>
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<div class="space-x-2">
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<label for="delay">
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Delay in milliseconds
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</label>
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<input data-bind-delay id="delay" type="number" step="100" min="0" class="w-36 rounded-md border border-gray-300 px-3 py-2 placeholder-gray-400 shadow-sm focus:border-sky-500 focus:outline focus:outline-sky-500 dark:disabled:border-gray-700 dark:disabled:bg-gray-800/20" />
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</div>
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<button data-on-click="@get(&#39;/hello-world&#39;)" class="rounded-md bg-sky-500 px-5 py-2.5 leading-5 font-semibold text-white hover:bg-sky-700 hover:text-gray-100 cursor-pointer">
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Start
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</button>
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</div>
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<div class="my-16 text-8xl font-bold text-transparent" style="background: linear-gradient(to right in oklch, red, orange, yellow, green, blue, blue, violet); background-clip: text">
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<div id="message">Hello, world!</div>
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</div>
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</body>
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</html>

‎examples/hello-httpkit/src/hello_httpkit.clj

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(ns hello-httpkit
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(:require
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[charred.api]
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[clojure.java.io :as io]
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[dev.onionpancakes.chassis.compiler :as hc]
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[dev.onionpancakes.chassis.core :as h]
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[org.httpkit.server]
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[reitit.ring.middleware.parameters]
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[reitit.ring]
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[ring.util.response]
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[starfederation.datastar.clojure.adapter.http-kit :refer [->sse-response on-open]]
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[starfederation.datastar.clojure.api :as d*]))
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(def read-json (charred.api/parse-json-fn {:async? false :bufsize 1024}))
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(defn get-signals [req]
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(-> req d*/get-signals read-json))
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(def home-page
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(slurp (io/resource "hello-world.html")))
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(defn home [_]
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(-> home-page
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(ring.util.response/response)
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(ring.util.response/content-type "text/html")))
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(def message "Hello, world!")
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(defn ->frag [i]
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(h/html
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(hc/compile
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[:div {:id "message"}
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(subs message 0 (inc i))])))
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(defn hello-world [request]
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(let [d (-> request get-signals (get "delay") int)]
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(->sse-response request
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{on-open
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(fn [sse]
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(d*/with-open-sse sse
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(dotimes [i (count message)]
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(d*/patch-elements! sse (->frag i))
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(Thread/sleep d))))})))
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(def routes
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[["/" {:handler home}]
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["/hello-world" {:handler hello-world
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:middleware [reitit.ring.middleware.parameters/parameters-middleware]}]])
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(def router (reitit.ring/router routes))
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(def handler (reitit.ring/ring-handler router))
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;; ------------------------------------------------------------
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;; Server
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;; ------------------------------------------------------------
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(defonce !server (atom nil))
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(defn stop! []
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(if-let [s @!server]
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(do (org.httpkit.server/server-stop! s)
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(reset! !server nil))
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(throw (ex-info "Server not running" {}))))
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(defn start! [handler opts]
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(when-not (nil? @!server)
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(stop!))
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(reset! !server
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(org.httpkit.server/run-server
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handler
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(merge {:port 8080}
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opts
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{:legacy-return-value? false}))))
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(comment
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(stop!)
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(start! #'handler {})
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)
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;; ------------------------------------------------------------
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;; Main
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;; ------------------------------------------------------------
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(defn -main [& _]
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(start! #'handler {:port 8080})
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(.addShutdownHook (Runtime/getRuntime)
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(Thread. #(do (stop!) (shutdown-agents)))))

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