mess

.#index.js

@@ -0,0 +1 @@
+avril@flan-laptop.2546:1595960333

build/message-min.js

@@ -0,0 +1,2 @@
+var MessageQueue=function(){"use strict";var t=function(t,s){return t(s={exports:{}},s.exports),s.exports}((function(t){t&&(t.exports=function(t){var s=this;this.array=t||[],this.over=!1,this.acceptInvalid=!1;var e={waiters:[],wait:function(){return new Promise(t=>e.waiters.push((function(){t()})))},signal:function(){e.waiters.length>0&&e.waiters.shift()()},flush:function(){for(;e.waiters.length>0;)e.waiters.shift()()}};this.take=async function(){if(!(s.over&&s.array.length<=0||(s.array.length<=0&&await e.wait(),s.over&&s.array.length<=0)))return s.array.shift()},this.poll=function(){return s.array},this.takeNB=function(){return s.array.length<=0?null:s.array.shift()},this.swallow0=async function(){for(var t,e=[];t=await s.take();)e.push(t);return e},this.swallow=function(t){return t?new Promise((function(e,o){var n=!0;s.swallow0().then((function(t){n&&e(t),n=!1})),t>0&&setTimeout(()=>{return s=new Error("swallow timeout reached ("+t+")"),n&&o(s),void(n=!1);var s},t)})):s.swallow0()},this.giveMany=function(t){for(let e of t)s.give(e)},this.give=function(t){(t||s.acceptInvalid)&&(s.array.push(t),e.signal())},this.commit=function(){return s.over=!0,e.flush(),s}})}));function s(){this.hooks=[]}s.prototype.hook=function(t){return this.hooks.push(t),this.hooks.length-1},s.prototype.unhook=function(t){this.hooks[t]=null},s.prototype.signal=function(t){for(const s of this.hooks)s&&s.apply(this,[t])},s.prototype.clear=function(){this.hooks=[]};const e=(t,s,e)=>(t.addEventListener(s,e),e);s.socket=(t,s)=>o(t);const o=o=>{const n=new s,i=new t;let r=!1;n.socket=o;const a=e(o,"message",t=>i.give(t.data)),c=e(o,"close",()=>i.commit());return(async()=>{let t;for(;void 0!==(t=await i.take());)n.signal({op:"message",value:t});n.signal({op:"close"})})(),n.close=t=>{r||(o.removeEventListener("message",a),o.removeEventListener("close",c),i.commit(),t&&o.close(),r=!0)},n.send=t=>{r||o.send(t)},n},n=t=>{const e=new s;let o=!1;e.socket=t.socket;const n=t.hook(t=>e.signal(t));e.close=s=>{o||(t.unhook(n),s&&t.close&&t.close(!0),o=!0)},e.send=s=>{o||t.socket.send(s)}};function i(e,r,a,c){this.socket=e instanceof s?n(e):e instanceof i?(t=>n(t.socket))(e):o(e),this.filter=r||(()=>!0),this.apply=a||(t=>t),this.map=c||(t=>t),this.premap=t=>t;const h=this.stage=new t,l=this;this.hook=this.socket.hook(t=>{if(t)switch(t.op){case"close":l.close();break;case"message":t=this.premap(t.value),this.filter(t)&&h.give(this.map(t))}})}i.JSON=(...t)=>{const s=new i(...t);return s.premap=t=>{try{return JSON.parse(t)}catch(t){return null}},s.apply=t=>JSON.stringify(s.apply(t)),s};const r=i.prototype;return r.clone=function(t,s,e){const o=new i(this.socket.socket,t||this.filter,s||this.apply,e||this.map);return o.premap=this.premap,o.on_close=this.on_close,o},r.close=function(t){this.on_close&&(this.on_close(this,t),this.on_close=null),this.socket.unhook(this.hook),this.stage.commit(),this.socket.close(t)},r.send=async function(t){for(;;){const s=this.stage.take();this.socket.send(this.apply(t));const e=await s;return e}},r.send0=function(t){this.socket.send(this.apply(t))},r.read=async function(){for(;;){const t=await this.stage.take();return t}},r.oneshot=async function(t){const s=await this.send(t);return this.close(),s},i}();
+//# sourceMappingURL=message-min.js.map

build/test.js

@@ -0,0 +1,24 @@
+const sock = new WebSocket("ws://localhost:7777");
+
+sock.addEventListener('open', () => {
+    (async ()=> {
+	const mw = new MessageQueue(sock);
+
+	let msg = await mw.read();
+	console.log(`=> ${msg}`);
+	let next = await mw.send("uwu");
+	console.log(`now => ${next}`);
+
+	mw.close();
+
+	
+	await (async () => {
+	    const mw = new MessageQueue(sock);
+
+	    let msg = await mw.send("OWO");
+	    console.log(`other ${msg}`);
+
+	    mw.close(true);
+	})();
+    })();
+});

dispatcher.js

@@ -0,0 +1,25 @@
+
+function Dispatcher() {
+    this.hooks = [];
+}
+
+Dispatcher.prototype.hook = function(cb) {
+    this.hooks.push(cb);
+    return this.hooks.length-1;
+};
+
+Dispatcher.prototype.unhook = function(index) {
+    this.hooks[index] = null;
+};
+
+Dispatcher.prototype.signal = function(value) {
+    for(const cb of this.hooks) {
+	if(cb) cb.apply(this, [value]);
+    }
+};
+
+Dispatcher.prototype.clear = function() {
+    this.hooks = [];
+};
+
+export default Dispatcher;

index.html

@@ -0,0 +1,6 @@
+<html>
+	<head>
+		<script src='./build/message-min.js'></script>
+		<script src='./build/test.js'></script>
+	</head>
+</html>

index.js

@@ -0,0 +1,73 @@
+const MessageQueue = require("./message");
+const util = require("./util");
+const addEventListenerHack = util.addEventListenerHack;
+const uuidv4 = util.uuidv4;
+const is_uuid = util.is_uuid;
+
+/**
+ * 
+ */
+function Pipe(ws) {
+    this.socket = ws;
+    
+    this.clients=0;
+    this.MAX_CLIENTS = 100;
+}
+
+const P = Pipe.prototype;
+
+P.connect = async function(message) {
+    let msg;
+    const socket = new MessageQueue(this.socket);
+    try {
+	while ((msg = await socket.read()) !== undefined) { // Expects {com: 'open', id: uuidv4()}
+	    try {
+		msg = JSON.parse(msg);
+	    } catch(_) {continue;}
+
+	    if (msg?.com === 'open' && (!message || msg?.msg === message)) {
+		let id = validate_id(msg?.id);
+		if(id) {
+		    if(this.clients < this.MAX_CLIENTS) {
+			const cli = new MessageQueue(this.socket);
+			let open = true;
+			cli.premap = (raw) => {
+			    try {
+				return JSON.parse(raw);
+			    }catch(_) {return null;}
+			};
+			cli.filter = (json) => json?.id === id && (json?.com === 'msg' || ((json?.com === 'close') && cli.close() && false));
+			cli.map = (json) => json?.message;
+			cli.apply =  (raw) => {
+			    const json = {message: raw, id: id, com: 'resp'};
+			    return JSON.stringify(json);
+			};
+			cli.on_close = (self)=> {
+			    if(open && self.id === id) { //in case of mistaken cloning
+ 				self.send0({com: 'resp', message: 'closing', id: id});
+				this.clients -= 1;
+				open = false;
+			    }
+			};
+			cli.id= id;
+
+			this.clients -=1;
+			socket.send0(JSON.stringify({com: 'resp', message: 'accepted', id: id}));
+			return cli;
+		    } else {
+			socket.send0(JSON.stringify({com: 'resp', message: 'declined', id: id, reason: 'too many open connections'}));
+		    }
+		}
+	    }
+	}
+    } finally {
+	socket.close();
+    }
+    return undefined;
+};
+
+P.close = function() {
+    this.socket.close();
+};
+
+exports = Pipe;

message.js

@@ -1,32 +1,8 @@
-const Stage = require('stage-js');
+import Stage from "@notflan/stage-js";
+import Dispatcher from "./dispatcher";
+import {addEventListenerHack} from "./util";
 
-function Dispatcher() {
-    this.hooks = [];
-}
-
-Dispatcher.prototype.hook = function(cb) {
-    this.hooks.push(cb);
-    return this.hooks.length-1;
-};
-
-Dispatcher.prototype.unhook = function(index) {
-    this.hooks[index] = null;
-};
-
-Dispatcher.prototype.signal = function(value) {
-    for(const cb of this.hooks) {
-	if(cb) cb.apply(this, [value]);
-    }
-};
-
-Dispatcher.prototype.clear = function() {
-    this.hooks = [];
-};
-
-const addEventListenerHack = (to, ev, lam) => {
-    to.addEventListener(ev, lam);
-    return lam;
-};
+Dispatcher.socket = (sock,cloned) => socket_dispatcher(sock,cloned);
 
 const socket_dispatcher = (ws) => {
     const disp = new Dispatcher();
@@ -35,20 +11,26 @@ const socket_dispatcher = (ws) => {
     
     disp.socket = ws;
     
-    const h0 = ws.addEventListener('message', (ev) => pusher.give(ev.data));
-    const h1 = ws.addEventListener('close', () => pusher.commit());
+    const h0 = addEventListenerHack(ws, 'message', (ev) => pusher.give(ev.data));
+    const h1 = addEventListenerHack(ws, 'close', () => pusher.commit());
 
     (async () => {
+	let msg;
 	while ( (msg = await pusher.take()) !== undefined) 
 	    disp.signal({op: 'message', value: msg});
 	disp.signal({op: 'close'});
+
     })();
 
-    disp.close = () => {
+    disp.close = (consume) => {
+
 	if(!closed) {
 	    ws.removeEventListener('message', h0);
 	    ws.removeEventListener('close', h1);
 	    pusher.commit();
+
+	    if(consume)
+		ws.close();
 	    closed=true;
 	}
     };
@@ -62,10 +44,38 @@ const socket_dispatcher = (ws) => {
     return disp;
 };
 
-function MessageQueue(ws, filter, apply) {
-    this.socket = socket_dispatcher(ws);
-    this.filter = filter || (()=>true);
-    this.apply = apply || ((o) => o);
+const message_dispatcher = (ws) => {
+    return dispatcher_dispatcher(ws.socket);
+};
+
+const dispatcher_dispatcher = (ws) => {
+    const disp = new Dispatcher();
+    let closed=false;
+
+    disp.socket = ws.socket;
+
+    const hook = ws.hook((sig) => disp.signal(sig));//just pass it
+
+    disp.close = (consume) => {
+	if(!closed){
+	    ws.unhook(hook);
+	    if(consume && ws.close)
+		ws.close(true);
+	    closed=true;
+	}
+    };
+    disp.send = (msg) => {
+	if(!closed) ws.socket.send(msg);
+    };
+};
+
+function MessageQueue(ws, filter, apply, map) {
+    this.socket = (ws instanceof Dispatcher) ? dispatcher_dispatcher(ws) : (ws instanceof MessageQueue) ? message_dispatcher(ws) : socket_dispatcher(ws);
+    
+    this.filter = filter || (()=>true); // Filter incoming messages. Return true to keep, false to ignore.
+    this.apply = apply || ((o) => o);   // Apply this function to outgoing messages.
+    this.map = map || ((o) => o);       // Apply this function to incoming messages after `filter`
+    this.premap = ((o) => o);           // Apply this function to incoming messages before `filter`
 
     const stage = this.stage = new Stage();
     const base = this;
@@ -79,7 +89,9 @@ function MessageQueue(ws, filter, apply) {
 		base.close();
 		break;
 		case 'message':
-		stage.give(msg.value);
+		msg = this.premap(msg.value);
+		if(this.filter(msg))
+		    stage.give(this.map(msg));
 		break;
 		default:
 		//uhh
@@ -88,29 +100,65 @@ function MessageQueue(ws, filter, apply) {
 	}
     });
 }
+MessageQueue.JSON = (...vars) => {
+    const q = new MessageQueue(...vars);
+    q.premap = x=> {
+	try {
+	    return JSON.parse(x);
+	} catch(_) {
+	    return null;
+	}
+    };
+    q.apply = x=> JSON.stringify(q.apply(x));
+    
+    return q;
+};
 
 const MQ = MessageQueue.prototype;
 
-MQ.close = () => {
+MQ.clone = function(filter, apply, map) {
+    const mq = new MessageQueue(this.socket.socket, filter || this.filter, apply || this.apply, map || this.map);
+    mq.premap = this.premap;
+    mq.on_close = this.on_close;
+    return mq;
+};
+
+MQ.close = function(consume) {
+    if (this.on_close) {this.on_close(this, consume); this.on_close = null;}
+    
     this.socket.unhook(this.hook);
     this.stage.commit();
-    this.socket.close();
+    this.socket.close(consume);
 };
 
-MQ.send = async (value) => {
+MQ.send = async function(value) {
+    while(true) {
 	const awaiter = this.stage.take();
 	this.socket.send(this.apply(value));
 	const ret = await awaiter;
+
+	if(ret === undefined) return ret;
+	else return ret;
+    }
 };
 
-MQ.read = () => this.stage.take();
+MQ.send0 = function(value) {
+    this.socket.send(this.apply(value));
+};
 
-MQ.oneshot = async (value) => {
+MQ.read = async function() {
+    while(true) {
+	const ret = await this.stage.take();
+
+	if(ret === undefined) return ret;
+	else return ret;
+    }
+};
+
+MQ.oneshot = async function(value) {
     const ret = await this.send(value);
     this.close();
     return ret;
 };
 
-
-if(module)
-    module.exports = MessageQueue;
+export default MessageQueue;

package-lock.json

@@ -4,10 +4,341 @@
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    "requires": true,
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+         "dev": true,
+         "requires": {
+            "@babel/highlight": "^7.10.4"
+         }
+      },
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+         "dev": true
+      },
+      "@babel/highlight": {
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+         "requires": {
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+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
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       "@notflan/stage-js": {
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+         "dev": true,
+         "requires": {
+            "has-flag": "^3.0.0"
+         }
+      },
+      "terser": {
+         "version": "4.8.0",
+         "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.0.tgz",
+         "integrity": "sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==",
+         "dev": true,
+         "requires": {
+            "commander": "^2.20.0",
+            "source-map": "~0.6.1",
+            "source-map-support": "~0.5.12"
+         }
+      },
+      "ws": {
+         "version": "7.3.1",
+         "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.1.tgz",
+         "integrity": "sha512-D3RuNkynyHmEJIpD2qrgVkc9DQ23OrN/moAwZX4L8DfvszsJxpjQuUq3LMx6HoYji9fbIOBY18XWBsAux1ZZUA==",
+         "dev": true
       }
    }
 }

package.json

@@ -2,9 +2,11 @@
    "name": "@username/message-queue",
    "version": "0.0.0",
    "description": "Await on websocket messages",
-   "private": true,
+   "entry": "index.js",   
    "scripts": {
-      "test": "echo \"Error: no test specified\" && exit 1"
+      "test": "echo \"Error: no test specified\" && exit 1",
+      "dev": "rollup -c -w",
+      "build": "rollup -c"
    },
    "keywords": [
       "async"
@@ -14,5 +16,11 @@
    "dependencies": {
       "@notflan/stage-js": "^0.1.0"
    },
-   "devDependencies": {}
+   "devDependencies": {
+      "rollup": "^2.23.0",
+      "rollup-plugin-commonjs": "^10.1.0",
+      "rollup-plugin-node-resolve": "^5.2.0",
+      "rollup-plugin-terser": "^6.1.0",
+      "ws": "^7.3.1"
+   }
 }

passthrough.js

@@ -0,0 +1,62 @@
+import MessageQueue from "./message.js";
+import {addEventListenerHack, uuidv4, is_uuid} from "./util";
+
+
+function Pipe(ws)
+{
+    this.socket =ws;
+    this.id = uuidv4();
+}
+
+const P = Pipe.prototype;
+
+P.connect = async function(message) {
+    const socket = new MessageQueue(this.socket);
+    
+    socket.send0(JSON.stringify({com: 'open', id: this.id, msg: message}));
+    try {
+	let msg;
+	while ((msg = await socket.read()) !== undefined) {
+	    try {
+		msg = JSON.parse(msg);
+	    } catch(_){continue;}
+
+	    if (msg.id === id && msg.com === 'resp') {
+		if (msg.message === 'accepted') {
+		    const cli = new MessageQueue(this.socket);
+		    let open=true;
+		    cli.id = id;
+		    cli.apply = (raw) => {
+			return JSON.stringify({message: raw, com: 'msg', id: id});
+		    };
+		    cli.premap = (raw) => {
+			try {
+			    return JSON.parse(raw);
+			}catch(_) {return null;}
+		    };
+		    cli.filter = (json) => json?.id === 'id' && (json?.com === 'msg' || json?.com === 'resp' && json?.message === 'closing' && cli.close() && false);
+		    cli.map = (json) => json?.message;
+		    cli.on_close = (self) => {
+			if(open && self.id === id) { //in case of mistaken cloning
+ 			    self.send0({com: 'close', message: 'closing', id: id});
+			    open = false;
+			}
+		    };
+		    return cli;
+		} else {
+		    console.log(`[${id}]: server responded with ${msg.message}: ${msg.reason}`);
+		    return false;
+		}
+	    }
+	}
+    } finally{
+	socket.close();
+    }
+    return undefined;
+};
+
+P.close = function() {
+    this.socket.close();
+};
+
+export default Pipe;

rollup.config.js

@@ -0,0 +1,16 @@
+import commonjs from "rollup-plugin-commonjs";
+import resolve from "rollup-plugin-node-resolve";
+import {terser} from "rollup-plugin-terser";
+
+export default {
+    input: "message.js",
+    output: { 
+	sourcemap: true, 
+	format: "iife",
+	name: "MessageQueue",
+	file: "build/message-min.js",
+    },
+    plugins: [
+	resolve({browser:true}), commonjs(),terser(),
+    ],
+};

test.js

@@ -0,0 +1,15 @@
+const WebSocket = require('ws');
+
+const wss = new WebSocket.Server({port: 7777});
+
+wss.on('connection', ws => {
+	console.log(`conn ${ws}`);
+    ws.on('message', message => {
+	    console.log(`got ${message}`);
+	ws.send(`Hello ${message}`);
+    });
+    ws.send("Start");
+	ws.on('close', () => {
+		console.log("closed");
+	});
+});

util.js

@@ -0,0 +1,21 @@
+function uuidv4() {
+    if (crypto) {
+	return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16));
+    }
+    else return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
+	const r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
+	return v.toStirng(16);
+    });
+}
+
+const UUID_RE = /^(\w{8}(-\w{4}){3}-\w{12}?)$/i;
+function is_uuid(id) {
+    return (typeof id === 'string' || id instanceof String) && UUID_RE.test(id);
+}
+
+const addEventListenerHack = (to, ev, lam) => {
+    to.addEventListener(ev, lam);
+    return lam;
+};
+
+export {addEventListenerHack, uuidv4, is_uuid};