Adding shutdown hook

* Migrated some code into Bot class
* Added shutdown hook with async pattern to send shutdown message
* Added utility module
* Added buildInfo version on startup and in startup message

bot/bot.js

@@ -1,9 +1,59 @@
+let fs = require('fs');
 let sdk = require("matrix-js-sdk");
 let message = require("./message.js");
+let utility = require("./utility.js");
 
 class Bot {
-    constructor(config) {
-        this.config = config
+    constructor(config, buildInfo) {
+        this.config = config;
+        this.buildInfo = buildInfo;
+        this.connected = false;
+    }
+
+    sendStatusStartup() {
+        let promises = [Promise.resolve(true)]
+        if (this.connected) {
+            this.config.statusRooms.forEach(roomId => {
+                console.log("Notifying %s", roomId, "of startup");
+                promises.push(this.client.sendMessage(
+                    roomId, message.createBasic("Started with version: " + this.buildInfo)
+                ).then(function () {
+                    console.log("Notified %s", roomId, "of startup");
+                }));
+            });
+        } else {
+            console.log("Attempting to send startup message while disconnected");
+        }
+        return Promise.all(promises);
+    }
+
+    sendStatusShutdown() {
+        let promises = [Promise.resolve(true)]
+        if (this.connected) {
+            this.config.statusRooms.forEach(roomId => {
+                console.log("Notifying %s", roomId, "of Shutdown");
+                promises.push(this.client.sendMessage(
+                    roomId, message.createBasic("Shutting down")
+                ).then(function () {
+                    console.log("Notified %s", roomId, "of shutdown");
+                }));
+            });
+        } else {
+            console.log("Attempting to send shutdown message while disconnected");
+        }
+        return Promise.all(promises);
+    }
+}
+
+function getBuildInfo(buildInfoPath) {
+    try {
+        return fs.readFileSync(buildInfoPath, "utf8");
+    } catch (err) {
+        if (err.code === 'ENOENT') {
+            return "UNKNOWN_" + utility.toISODateString(new Date());
+        } else {
+            console.log("Unexpected Error! " + err);
+        }
     }
 }
 
@@ -11,7 +61,10 @@ function create(configFile) {
     let config = require(configFile);
     console.log("Running with config:");
     console.log(config);
-    return new Bot(config);
+    let buildInfo = getBuildInfo("../build.info")
+    console.log("Running version:");
+    console.log(buildInfo);
+    return new Bot(config, buildInfo);
 }
 
 function init(bot) {
@@ -22,25 +75,15 @@ function init(bot) {
         userId: bot.config.userId
     });
 
-    function sendClientStatusUpdate() {
-        bot.config.statusRooms.forEach(roomId => {
-            console.log("Notifying %s", roomId);
-            bot.client.sendMessage(roomId, message.createBasic("Started!")).done(function () {
-                console.log("Notified %s", roomId);
-            })
-        });
-    }
-
-    // Prep the bot
-    bot.client.on("sync", function (state, previousState, data) {
+    bot.client.on("sync", async function (state, previousState, data) {
         switch (state) {
             case "PREPARED":
-                sendClientStatusUpdate();
+                bot.connected = true;
+                await bot.sendStatusStartup();
                 break;
         }
     });
 
-    // auto join rooms that an admin user has invited the bot to
     bot.client.on("RoomMember.membership", function (event, member) {
         if (member.membership === "invite"
             && bot.config.admin.indexOf(ember.userId) >= 0) {
@@ -50,11 +93,31 @@ function init(bot) {
         }
     });
 
+    /* Capture Exit Conditions */
+
+    ["SIGINT", "SIGTERM"].forEach((signature) => {
+        process.on(signature, async () => {
+            await bot.sendStatusShutdown()
+                .then(function () {
+                    console.log("Gracefully stopping Matrix SDK Client")
+                    bot.client.stopClient();
+                });
+            process.exit(0);
+        });
+    });
+
+    process.on('exit', async function () {
+        console.log("Shutting Down");
+    });
+
     return bot;
 }
 
 function run(bot) {
-    bot.client.startClient()
+    // console.log("Initializing Crypto");
+    // await bot.client.initCrypto();
+    console.log("Starting Matrix SDK Client");
+    bot.client.startClient();
 }
 
 exports.create = create;

bot/utility.js

@@ -0,0 +1,18 @@
+function toISODateString(d) {
+    function pad(n) { return n < 10 ? '0' + n : n }
+    return d.getUTCFullYear() + '-'
+        + pad(d.getUTCMonth() + 1) + '-'
+        + pad(d.getUTCDate()) + 'T'
+        + pad(d.getUTCHours()) + ':'
+        + pad(d.getUTCMinutes()) + ':'
+        + pad(d.getUTCSeconds()) + 'Z'
+}
+
+function sleep(ms){
+    return new Promise(resolve=>{
+        setTimeout(resolve,ms)
+    })
+}
+
+exports.toISODateString = toISODateString;
+exports.sleep = sleep;

index.js

@@ -1,2 +1,6 @@
 let bot = require('./bot/bot.js');
-bot.run(bot.init(bot.create("../data/config.json")));
+bot.run(
+    bot.init(
+        bot.create("../data/config.json")
+    )
+);