Merge pull request 'issue/fetch' (#21) from issue/fetch into master

Reviewed-on: #21

.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "request": "launch",
+            "name": "Launch Program",
+            "type": "node",
+            "program": "${workspaceFolder}/server.tsx",
+            "cwd": "${workspaceFolder}",
+            "runtimeExecutable": "C:\\Users\\Seth\\.deno\\bin\\deno.EXE",
+            "runtimeArgs": [
+                "run",
+                "--no-lock",
+                "--unstable",
+                "--inspect-wait",
+                "--allow-all"
+            ],
+            "attachSimplePort": 9229
+        }
+    ]
+}

deno.lock

@@ -0,0 +1,16 @@
+{
+  "version": "2",
+  "remote": {
+    "http://localhost:4507/lib/iso.tsx": "edf1cf4c539900040c75824eac8472e0ec43098b13af4049bd79ddbd76a5346d",
+    "https://esm.sh/preact@10.13.2/compat": "1cf68e0c8c6c84b60d42f30665403b67229c16ff5206824709b19df60ba9cdc3",
+    "https://esm.sh/stable/preact@10.13.2/deno/compat.js": "3151a948abd84aa75dfc9e57733da7e1a45fff7a25de58c7b6025b923874b508",
+    "https://esm.sh/stable/preact@10.13.2/deno/hooks.js": "c7a8e703bcbc6a05949f329b618c33d5d1ea5fee113ddcea44ff0f527af8556f",
+    "https://esm.sh/stable/preact@10.13.2/deno/preact.mjs": "365fab897381f4f403f859c5d12939084560545567108cc90dae901bbe892578",
+    "https://esm.sh/v116/preact@10.13.2/compat/src/index.d.ts": "d02f015638a40e32649151e011cfda7b520d66f7fbd3c12a28fa03de2a5e1421",
+    "https://esm.sh/v116/preact@10.13.2/compat/src/suspense-list.d.ts": "b8e274324392157ce476ef3a48ae215c9f7003b08525d140645f19eab20d1948",
+    "https://esm.sh/v116/preact@10.13.2/compat/src/suspense.d.ts": "81f5266e0977a94347505d11b8103024211f2b4f3b2eb2aa276a10d8fd169e65",
+    "https://esm.sh/v116/preact@10.13.2/hooks/src/index.d.ts": "5c29febb624fc25d71cb0e125848c9b711e233337a08f7eacfade38fd4c14cc3",
+    "https://esm.sh/v116/preact@10.13.2/src/index.d.ts": "65398710de6aa0a07412da79784e05e6e96763f51c7c91b77344d2d0af06385c",
+    "https://esm.sh/v116/preact@10.13.2/src/jsx.d.ts": "9ac9b82c199fa7b04748807d750eba1a106c0be52041b8617416f88d6fc0a257"
+  }
+}

example/app.tsx

@@ -1,16 +1,24 @@
 import TWPreTail from "https://esm.sh/v115/@twind/preset-tailwind@1.1.4/es2022/preset-tailwind.mjs";
 import TWPreAuto from "https://esm.sh/v115/@twind/preset-autoprefix@1.0.7/es2022/preset-autoprefix.mjs";
 import React from "react";
-import Component from "./deep/component.tsx";
 import * as Iso from "@eno/iso";
 
+const Comp = React.lazy(()=>import("./deep/component.tsx"));
+
 export default ()=>
 {
     return <div class="p-4 font-sans">
         <Iso.Metas title="Main Page!"/>
-        <h1 class="my-2 font(bold serif) text(2xl)">Title!!</h1>
-        <h2>subtitle</h2>
-        <Component/>
+        <nav class="p-4">
+            <a class="text-red-500" href="/">Home</a>
+            <a href="/about">About</a>
+        </nav>
+
+        <h1 class="my-2 font(bold serif) text(3xl)">Title!!</h1>
+        <h2>suspended:</h2>
+        <React.Suspense fallback={<div>Loading!</div>}>
+            <Comp/>
+        </React.Suspense>
         <Iso.Switch>
             <Iso.Case value="page">
                 <Iso.Switch>

example/deep/component.tsx

@@ -4,14 +4,20 @@ import * as Iso from "@eno/iso";
 export default ()=>
 {
     const [countGet, countSet] = React.useState(1);   
-
     const [routeGet, routeSet] = Iso.Router.Consumer();
 
+    type CatFact = {fact:string, length:number}|undefined;
+    const [Data, Updating] = Iso.Fetch.Use(`https://catfact.ninja/fact`);
+
+
+    console.log("render!!")
+
     return <div class="p-4 text-red-500">
         <Iso.Metas title="Component!"/>
-        Route is: {routeGet.Path.toString()}
-        <button className="p-4 bg-red-500 text-white" onClick={e=>{countSet(countGet+1); routeSet(["lol", "idk"], {count:countGet+1});}}>{countGet}</button>
-        Component!!!
+        Component Route is: {routeGet.Path.toString()}
+        <button className="p-4 bg-green-500 text-white" onClick={e=>{countSet(countGet+1); routeSet(["lol", "idk"], {count:countGet+1});}}>{countGet}</button>
         <a href="/page/about-us" className="p-2 text(lg blue-500) font-bold">a link</a>
+        <p>Data:{Data && (Data as CatFact)?.fact}</p>
+        <p>Status:{Updating?'loading':'done'}</p>
     </div>;
 };

fetch.test.tsx

@@ -0,0 +1,35 @@
+import {Fetch} from "./lib/iso.tsx";
+
+
+const delay =async(inHandler:()=>void, inDelay:number):Promise<void>=>
+{
+    return new Promise((accept)=>{
+        setTimeout(()=>{
+            accept(inHandler());
+        }, inDelay);
+    });
+};
+
+const queue = [1, 2, 3];
+while(queue.length)
+{
+    await(delay(()=>{console.log(queue.pop())}, 1000))
+}
+
+console.log("all done!");
+
+/*
+let r1, r2, r3;
+
+delay(()=>{r1 = Fetch.Request(`https://catfact.ninja/fact`, undefined, 0.2); console.log(r1); }, 10);
+delay(()=>{r2 = Fetch.Request(`https://catfact.ninja/fact`, undefined, 0.2); console.log(r2); }, 20);
+delay(()=>{r3 = Fetch.Request(`https://catfact.ninja/fact`, undefined, 0.2); console.log(r3); }, 2000);
+
+
+await delay(()=>{}, 3000);
+
+console.log(r1);
+console.log(r2);
+console.log(r3);
+
+*/

lib/iso.tsx

@@ -158,4 +158,113 @@ export const Switch =({children}:{children:Children})=>
     return fallback;
 };
 export const Case =({children, value}:{children:Children, value?:string, default?:true})=>null;
-export const useRouteVars =()=> React.useContext(SwitchContext).keys;
+export const useRouteVars =()=> React.useContext(SwitchContext).keys;
+
+export type FetchCachOptions = {CacheFor:number, CacheOnServer:boolean, DelaySSR:boolean, Seed:boolean};
+export type FetchRecord = {URL:string, Promise?:Promise<FetchRecord>, CachedAt:number, Error?:string, JSON?:object} & FetchCachOptions;
+type FetchGuide = [Record:FetchRecord, Init:boolean, Listen:boolean];
+export type FetchHookState = [Data:undefined|object, Updating:boolean];
+export const Fetch = {
+    Cache:new Map() as Map<string, FetchRecord>,
+    ServerBlocking:false as false|Promise<FetchRecord>[],
+    ServerTouched:false as false|Set<FetchRecord>,
+    ServerRemove:false as false|Set<FetchRecord>,
+    Seed(seed:FetchRecord[])
+    {
+        seed.forEach(r=>{
+            //r.Promise = Promise.resolve(r);
+            Fetch.Cache.set(r.URL, r)
+        });
+    },
+    DefaultOptions:{CacheFor:60, CacheOnServer:true, DelaySSR:true, Seed:true} as FetchCachOptions,
+    Request(URL:string, Init?:RequestInit|null, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true, Seed:boolean = true):FetchGuide
+    {
+        let check = Fetch.Cache.get(URL);
+        
+        const load =(inCheck:FetchRecord)=>
+        {
+            Fetch.Cache.set(URL, inCheck);
+            inCheck.CachedAt = 0;
+            inCheck.Promise = fetch(URL, Init?Init:undefined).then(resp=>resp.json()).then((json)=>{
+                inCheck.JSON = json;
+                inCheck.CachedAt = new Date().getTime();
+                console.log(`...cached!`);
+                return inCheck;
+            });
+            return inCheck;
+        };
+
+        if(!check)
+        {
+            // not in the cache
+            // - listen
+
+            console.log(`making new cache record...`);
+            return [load({URL, CacheFor, CachedAt:0, CacheOnServer, DelaySSR, Seed}), false, true];
+        }
+        else if(check.CachedAt == 0)
+        {
+            // loading started but not finished
+            // - listen
+            // - possibly init if there is something in JSON
+
+            console.log(`currently being cached...`);
+            return [check, check.JSON ? true : false, true];
+        }
+        else
+        {
+            console.log(`found in cache...`);
+            let secondsAge = (new Date().getTime() - check.CachedAt)/1000;
+            if(secondsAge > check.CacheFor)
+            {
+                // cached but expired
+                // - listen
+                // - init
+                console.log(`...outdated...`);
+                return [load(check), true, true];
+            }
+            else
+            {
+                // cached and ready
+                // - init
+                console.log(`...retrieved!`);
+                return [check, true, false];
+            }
+
+        }
+    },
+
+    Use(URL:string, Init?:RequestInit|null, Options?:FetchCachOptions)
+    {
+        const config = {...Fetch.DefaultOptions, ...Options};
+        const [receipt, init, listen] = Fetch.Request(URL, Init, config.CacheFor, config.CacheOnServer, config.DelaySSR, config.Seed);
+        const initialState:FetchHookState = init ? [receipt.JSON, listen] : [undefined, true];
+        const [cacheGet, cacheSet] = React.useState(initialState);
+
+        if(Fetch.ServerBlocking && Fetch.ServerTouched && config.DelaySSR) // if server-side rendering
+        {
+            if(listen) // if the request is pending
+            {
+                receipt.Promise && Fetch.ServerBlocking.push(receipt.Promise); // add promise to blocking list
+                return [undefined, listen] as FetchHookState; // no need to return any actual data while waiting server-side
+            }
+            else // if request is ready
+            {
+                receipt.Seed && Fetch.ServerTouched.add(receipt); // add record to client seed list (if specified in receipt.seed)
+                return [receipt.JSON, false] as FetchHookState;
+            }
+        }
+
+        React.useEffect(()=>
+        {
+            if(listen)
+            {
+                //const receipt = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR);
+                receipt.Promise?.then(()=>cacheSet([receipt.JSON, receipt.CachedAt === 0]));
+            }
+        }
+        , []);
+
+        return cacheGet;
+    }
+};

server.tsx

@@ -2,6 +2,7 @@ import * as ESBuild from 'https://deno.land/x/esbuild@v0.14.45/mod.js';
 import * as MIME from "https://deno.land/std@0.180.0/media_types/mod.ts";
 import { debounce } from "https://deno.land/std@0.151.0/async/debounce.ts";
 import SSR from "https://esm.sh/v113/preact-render-to-string@6.0.2";
+import Prepass from "https://esm.sh/preact-ssr-prepass@1.2.0";
 import * as Twind from "https://esm.sh/@twind/core@1.1.3";
 import React from "react";
 import * as Iso from "@eno/iso";
@@ -35,7 +36,8 @@ const Transpileable =(inFilePath:string):boolean=>
 };
 const Transpile =async(inCode:string, inKey:string):Promise<string>=>
 {
-    const transpile = await ESBuild.transform(inCode, { loader: "tsx", minify:true});
+    const transpile = await ESBuild.transform(inCode, { loader: "tsx", sourcemap:"inline", minify:true, sourcefile:inKey});
+
     Transpiled.set(inKey, transpile.code);
     return transpile.code;
 };
@@ -221,10 +223,36 @@ FileListen("${url.pathname}", reloadHandler);`;
         }
         else
         {
-            const results = Twind.extract(SSR(<Iso.Router.Provider url={url}><App/></Iso.Router.Provider>), TwindInst);
+            Iso.Fetch.ServerBlocking = [];
+            Iso.Fetch.ServerTouched = new Set();
+            Iso.Fetch.ServerRemove = new Set();
+            let app = <Iso.Router.Provider url={url}><App/></Iso.Router.Provider>;
+            await Prepass(app)
+            let bake = SSR(app);
+            while(Iso.Fetch.ServerBlocking.length)
+            {
+                await Promise.all(Iso.Fetch.ServerBlocking);
+                Iso.Fetch.ServerBlocking = [];
+                // at this point, anything that was requested that was not cached, has now been loaded and cached
+                // this next render will use cached resources. using a cached resource (if its "Seed" is true) adds it to the "touched" set.
+                app = <Iso.Router.Provider url={url}><App/></Iso.Router.Provider>;
+                await Prepass(app)
+                bake = SSR(app);
+            }
+
+            const seed:Iso.FetchRecord[] = [];
+            Iso.Fetch.ServerTouched.forEach((record)=>{
+                const r:Iso.FetchRecord = {...record};
+                delete r.Promise;
+                seed.push(r);
+            });
+            Iso.Fetch.ServerTouched = false;
+
+            const results = Twind.extract(bake, TwindInst);
 
             type = `text/html`;
-            body = `<!doctype html>
+            body =
+`<!doctype html>
 <html lang="en">
     <head>
         <title>${Iso.Meta.title}</title>
@@ -236,12 +264,14 @@ FileListen("${url.pathname}", reloadHandler);`;
     <body>
         <div id="app">${results.html}</div>
         <script type="module">
-            import {render, createElement as H} from "react";
+            import {hydrate, createElement as H} from "react";
             import * as Twind from "https://esm.sh/v115/@twind/core@1.1.3/es2022/core.mjs";
             import {default as App, CSS} from "@eno/app";
-            import {Router} from "@eno/iso";
+            import {Router, Fetch} from "@eno/iso";
             Twind.install(CSS);
-            render( H(Router.Provider, null, H(App)), document.querySelector("#app"));
+            Fetch.Seed(${JSON.stringify(seed)});
+            const hmrWrap = H( ()=>H(App) );
+            hydrate( H(Router.Provider, null, hmrWrap), document.querySelector("#app"));
         </script>
     </body>
 </html>`;