added hot-load-demo

example/hot-reload-bot/index.js

@@ -0,0 +1,92 @@
+/**
+ * Wechaty hot load dots demo
+ *
+ * DEV: docker run -ti -e --rm --volume="$(pwd)":/bot zixia/wechaty index.js
+ * PROD: docker run -ti -e NODE_ENV=production --rm --volume="$(pwd)":/bot zixia/wechaty index.js
+ * 
+ * @author: Gcaufy
+ * 
+ */
+const fs = require('fs');
+const path = require('path');
+const Wechaty = require('wechaty').default;
+
+const isProd = process.env.NODE_ENV === 'production';
+const bot = Wechaty.instance();
+
+const EVENT_LIST = ['scan', 'logout', 'login', 'friend', 'room-join', 'room-leave', 'room-topic', 'message', 'heartbeat', 'error'];
+
+
+// Load lisenter
+const loadListener = (evt) => {
+    let fn;
+    try {
+        fn = require(`./listener/${evt}`);
+        console.log(`binded listener: ${evt}`);
+    } catch (e) {
+        fn = () => void 0;
+        if (e.toString().indexOf('Cannot find module') > -1) {
+            console.warn(`listener ${evt} is not defined.`);
+        } else {
+            console.error(e);
+        }
+    }
+    return fn;
+}
+
+// purge require cache
+const purgeCache = (moduleName) => {
+    var mod = require.resolve(moduleName);
+    if (mod && ((mod = require.cache[mod]) !== undefined)) {
+        (function traverse(mod) {
+            mod.children.forEach(function (child) {
+                traverse(child);
+            });
+            delete require.cache[mod.id];
+        }(mod));
+    }
+
+    Object.keys(module.constructor._pathCache).forEach(function(cacheKey) {
+        if (cacheKey.indexOf(moduleName)>0) {
+            delete module.constructor._pathCache[cacheKey];
+        }
+    });
+};
+
+let eventHandler = {};
+
+
+if (!isProd) { // start a watcher only if it's not production environment.
+    fs.watch('./listener', (e, filename) => {
+        let evt = filename.substring(0, filename.length - 3);
+        console.log(`${e}: ${filename}`);
+
+        if (EVENT_LIST.indexOf(evt) > -1) {
+            if (e === 'change') {
+                console.log(`${evt} listener reloaded.`);
+                purgeCache(`./listener/${evt}`);
+                // It may read an empty file, if not use setTimeout
+                setTimeout(() => {
+                    bot.removeListener(evt, eventHandler[evt]);
+                    //console.log('filecontent: ' + fs.readFileSync(`./listener/${evt}.js`));
+                    eventHandler[evt] = loadListener(evt);
+                    bot.on(evt, eventHandler[evt]);
+                }, 1000);
+            } else if (e === 'rename') {
+                console.log(`${evt} listener removed.`);
+                bot.removeListener(evt, eventHandler[evt]);
+                eventHandler[evt] = () => void 0;
+                bot.on(evt, eventHandler[evt]);
+            }
+        }
+    });
+}
+
+// Bind events
+EVENT_LIST.forEach(evt => {
+    eventHandler[evt] = loadListener(evt);
+    bot.on(evt, eventHandler[evt]);
+});
+
+
+bot.init();

example/hot-reload-bot/listener/friend.js

@@ -0,0 +1,8 @@
+exports = module.exports = async function onFriend (contact, request) {
+    if(request){
+        let name = contact.name();
+        await request.accept();
+
+        console.log(`Contact: ${name} send request ${request.hello}`);
+    }
+}

example/hot-reload-bot/listener/login.js

@@ -0,0 +1,3 @@
+exports = module.exports = function onLoging (user) {
+    console.log(`${user} login`);
+}

example/hot-reload-bot/listener/message.js

@@ -0,0 +1,22 @@
+exports = module.exports = async function onMessage (message) {
+    const room      = message.room();
+    const sender    = message.from();
+    const content   = message.content();
+
+    const topic = room ? '[' + room.topic() + ']' : '';
+
+
+    console.log(`${topic} <${sender.name()}> : ${message.toStringDigest()}`);
+
+    if (message.self() || room) {
+        console.log('message is sent from myself, or inside a room.');
+        return;
+    }
+
+    if (content === 'ding') {
+         message.say('thanks for ding me...');
+    } else {
+        sender.say('auto reply.');
+        return;
+    }
+}

example/hot-reload-bot/listener/scan.js

@@ -0,0 +1,5 @@
+exports = module.exports = function onScan (url, code) {
+    let loginUrl = url.replace('qrcode', 'l');
+    require('qrcode-terminal').generate(loginUrl);
+    console.log(url);
+}