Do app -> client communication more like tfrpc so that it's easier to get responses.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3956 ed5197a5-7fde-0310-b194-c3ffbd925b24

core/app.js

@@ -1,7 +1,10 @@
 import * as auth from './auth.js';
 import * as core from './core.js';
 
-var gSessionIndex = 0;
+let g_next_id = 1;
+let g_calls = {};
+
+let gSessionIndex = 0;
 
 function makeSessionId() {
 	return (gSessionIndex++).toString();
@@ -19,31 +22,45 @@ App.prototype.readOutput = function(callback) {
 
 App.prototype.makeFunction = function(api) {
 	let self = this;
+	let id = g_next_id++;
+	while (!id || g_calls[id]) {
+		id = g_next_id++;
+	}
+	let promise = new Promise(function(resolve, reject) {
+		g_calls[id] = {resolve: resolve, reject: reject};
+	});
 	let result = function() {
-		let message = {action: api[0]};
-		for (let i = 1; i < api.length; i++) {
-			message[api[i]] = arguments[i - 1];
-		}
+		let message = {
+			message: 'tfrpc',
+			method: api[0],
+			params: [...arguments],
+			id: id,
+		};
 		self.send(message);
+		return promise;
 	};
 	Object.defineProperty(result, 'name', {value: api[0], writable: false});
 	return result;
 }
 
 App.prototype.send = function(message) {
-	if (message) {
-		this._send_queue.push(message);
+	if (this._send_queue) {
+		if (this._on_output) {
+			this._send_queue.forEach(x => this._on_output(x));
+			this._send_queue = null;
+		} else if (message) {
+			this._send_queue.push(message);
+		}
 	}
-	if (this._on_output) {
-		this._send_queue.forEach(message => this._on_output(message));
-		this._send_queue = [];
+	if (message && this._on_output) {
+		this._on_output(message);
 	}
 }
 
 function socket(request, response, client) {
-	var process;
-	var options = {};
-	var credentials = auth.query(request.headers);
+	let process;
+	let options = {};
+	let credentials = auth.query(request.headers);
 
 	response.onClose = async function() {
 		if (process && process.task) {
@@ -59,7 +76,7 @@ function socket(request, response, client) {
 
 	response.onMessage = async function(event) {
 		if (event.opCode == 0x1 || event.opCode == 0x2) {
-			var message;
+			let message;
 			try {
 				message = JSON.parse(event.data);
 			} catch (error) {
@@ -67,11 +84,11 @@ function socket(request, response, client) {
 				return;
 			}
 			if (message.action == "hello") {
-				var packageOwner;
-				var packageName;
-				var blobId;
-				var match;
-				var parentApp;
+				let packageOwner;
+				let packageName;
+				let blobId;
+				let match;
+				let parentApp;
 				if (match = /^\/([&%][^\.]{44}(?:\.\w+)?)(\/?.*)/.exec(message.path)) {
 					blobId = match[1];
 				} else if (match = /^\/\~([^\/]+)\/([^\/]+)\/$/.exec(message.path)) {
@@ -83,7 +100,7 @@ function socket(request, response, client) {
 						return;
 					}
 					if (packageOwner != 'core') {
-						var coreId = await new Database('core').get('path:' + packageName);
+						let coreId = await new Database('core').get('path:' + packageName);
 						parentApp = {
 							path: '/~core/' + packageName + '/',
 							id: coreId,
@@ -101,7 +118,7 @@ function socket(request, response, client) {
 				options.credentials = credentials;
 				options.packageOwner = packageOwner;
 				options.packageName = packageName;
-				var sessionId = makeSessionId();
+				let sessionId = makeSessionId();
 				if (blobId) {
 					process = await core.getSessionProcessBlob(blobId, sessionId, options);
 				}
@@ -112,9 +129,9 @@ function socket(request, response, client) {
 					process.app.send();
 				}
 
-				var ping = function() {
-					var now = Date.now();
-					var again = true;
+				let ping = function() {
+					let now = Date.now();
+					let again = true;
 					if (now - process.lastActive < process.timeout) {
 						// Active.
 					} else if (process.lastPing > process.lastActive) {
@@ -143,6 +160,15 @@ function socket(request, response, client) {
 				}
 			} else if (message.action == 'permission') {
 				core.setPermission(process, message.id, message.granted);
+			} else if (message.message == 'tfrpc') {
+				if (message.id && g_calls[message.id]) {
+					if (message.error !== undefined) {
+						g_calls[message.id].reject(message.error);
+					} else {
+						g_calls[message.id].resolve(message.result);
+					}
+					delete g_calls[message.id];
+				}
 			} else {
 				if (process && process.eventHandlers['message']) {
 					await core.invoke(process.eventHandlers['message'], [message]);

core/client.js

@@ -438,7 +438,7 @@ function api_localStorageSet(key, value) {
 }
 
 function api_localStorageGet(key, value) {
-	send({message: 'localStorage', key: key, value: window.localStorage.getItem('app:' + key)});
+	return window.localStorage.getItem('app:' + key);
 }
 
 function api_requestPermission(permission, id) {
@@ -594,10 +594,24 @@ function receive(message) {
 			}
 			timeseries.append(now, message.stats[key]);
 		}
-	} else if (message && message.action) {
-		let api = k_api[message.action];
+	} else if (message &&
+		message.message === 'tfrpc' &&
+		message.method) {
+		let api = k_api[message.method];
 		if (api) {
-			api.func(...api.args.map(x => message[x]));
+			Promise.resolve(api.func(...message.params)).then(function(result) {
+				send({
+					message: 'tfrpc',
+					id: message.id,
+					result: result,
+				});
+			}).catch(function(error) {
+				send({
+					message: 'tfrpc',
+					id: message.id,
+					error: error,
+				});
+			});
 		}
 	}
 }

core/tfrpc.js

@@ -14,6 +14,9 @@ if (k_is_browser) {
 function make_rpc(target, prop, receiver) {
 	return function() {
 		let id = g_next_id++;
+		while (!id || g_calls[id]) {
+			id = g_next_id++;
+		}
 		let promise = new Promise(function(resolve, reject) {
 			g_calls[id] = {resolve: resolve, reject: reject};
 		});