151 lines
5.7 KiB
Go
151 lines
5.7 KiB
Go
// Command server runs the kjol-website site on kjol's reusable wasmdevserver:
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// it SSRs the app's static routes, hosts the /rsc server-component endpoint, and
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// hot-swaps the wasm into the browser on change. It shows the coupling
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// inversion — the framework (wasmdevserver) imports no app code; the app injects
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// Build/Render/Document here.
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//
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// Run it from THIS directory (the relative paths below are resolved against it):
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//
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// go run ./server # from go/cmd/kjol-website
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package main
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import (
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"flag"
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"fmt"
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"log"
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"net/http"
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"kjol/httputil"
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"kjol/vdom"
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"kjol/wasmdevserver"
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"kjol/webui"
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"kjolwebsite/app"
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"kjolwebsite/build"
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"kjolwebsite/internal/handlers"
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)
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func main() {
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addr := flag.String("addr", ":8085", "listen address")
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watch := flag.Bool("watch", true, "watch sources, rebuild wasm, hot-reload")
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buildOnly := flag.Bool("build", false, "run the full build once and exit (no server)")
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flag.Parse()
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if *buildOnly {
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build.Cold()
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return
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}
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log.Fatal(wasmdevserver.Serve(wasmdevserver.Config{
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Addr: *addr,
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Dir: "./wwwroot",
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Watch: *watch,
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WatchDirs: []string{
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"app", "wasm", "css", // the Go/WASM app
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"frontend", // the Solid app — a .tsx save rebuilds the JS bundle
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"../../webui", "../../vdom", "../../wasmruntime", "../../rsc", // the wasm engine
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"../../lexer", // the code-block highlighter
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"../../jsruntime/uikit", "../../jsruntime/styles", // the Solid kit + the shared theme
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},
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Build: build.All,
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BuildCSS: build.Tailwind, // a .css save skips codegen+wasm and hot-swaps the stylesheet
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Render: render,
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Document: document,
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Handle: routes,
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}))
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}
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// routes registers everything the WASM app does not own.
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//
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// Order does not matter here — Go's ServeMux picks the most specific pattern, not the
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// first — but the shape does: /js/* belongs to a completely different front-end, and it
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// is claimed BEFORE the wasm app's "/" catch-all ever sees it. Two SPAs, one server, no
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// argument about who owns a URL.
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func routes(mux *http.ServeMux) {
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handlers.RegisterPublicPages(mux) // the SSR'd public pages (/js/ssr)
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mux.HandleFunc("GET /js/", serveJSApp)
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mux.HandleFunc("GET /js", serveJSApp)
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// /api/quotes responds with a gob-encoded []app.Quote (via httputil.RespondGob) —
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// the /wasm/data page fetches and decodes it on the client with encoding/gob (Go
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// types end to end, no JSON).
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mux.HandleFunc("GET /api/quotes", func(w http.ResponseWriter, r *http.Request) {
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httputil.RespondGob(w, http.StatusOK, sampleQuotes())
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})
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}
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// serveJSApp ships the shell for the Solid SPA. Every /js/* route gets the SAME empty
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// document — the client router reads the URL and decides what to render, which is what
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// makes it a single-page app.
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//
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// It carries no server-rendered markup, and that is a real difference from Kjøl Wasm Web
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// rather than an oversight: this is a docs section behind a click, where a blank first
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// frame costs nothing. Where it WOULD cost something, the public-page path (see
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// internal/handlers) renders on the server instead — /js/ssr is that, and it is
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// registered above, so it never reaches this handler.
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func serveJSApp(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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fmt.Fprint(w, `<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Kjøl JS Web</title>
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`+webui.ThemeBootScript+`
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<link rel="stylesheet" href="/bundle.min.css" />
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</head>
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<body class="antialiased">
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<div id="app"></div>
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<script type="module" src="/bundle.min.js"></script>
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</body>
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</html>`)
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}
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func sampleQuotes() []app.Quote {
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return []app.Quote{
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{Author: "Rob Pike", Text: "A little copying is better than a little dependency."},
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{Author: "Rob Pike", Text: "Don't communicate by sharing memory; share memory by communicating."},
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{Author: "Ken Thompson", Text: "When in doubt, use brute force."},
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{Author: "Alan Kay", Text: "The best way to predict the future is to invent it."},
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}
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}
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// render SSRs a static route's #app inner HTML; ok=false ships an empty #app
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// (client-rendered). It is the same neutral render the client runs, so the client
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// hydrates it.
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func render(path string) (string, bool) {
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if !app.StaticPaths[path] {
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return "", false
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}
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deps := app.Deps{Path: func() string { return path }} // Navigate is nil on the server
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return vdom.RenderHTML(app.Shell(deps, app.Routes(deps))), true
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}
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// document wraps the server-rendered inner HTML in the page shell. No whitespace
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// between <div id="app"> and the markup, so hydration's childNodes line up. The
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// dev server injects the livereload script before </body> in watch mode.
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func document(inner string) string {
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// The theme boot script comes FIRST — before the stylesheet, before any markup.
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//
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// The server cannot read localStorage, so it cannot know which theme to render. If
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// the dark class were applied by the WebAssembly once it loads, a dark-mode user
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// would be shown a white page for as long as the binary takes to download and then
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// have it snatched away. This runs synchronously, before the first paint, so the
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// first paint is already right. It is the only JavaScript in the project.
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return `<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>kjøl — a shared base layer</title>
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` + webui.ThemeBootScript + `
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<link rel="stylesheet" href="/app.css" />
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</head>
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<body class="bg-surface text-ink antialiased">
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<div id="app">` + inner + `</div>
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<script src="/wasm_exec.js"></script>
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<script src="/wasmboot.js"></script>
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</body>
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</html>`
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}
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