feat: validate required files and add timestamp to logs

assistant.js

@@ -1,30 +1,40 @@
 "use strict";
 
 const GoogleAssistant = require("google-assistant");
+const fs = require("fs");
 
 /** See https://github.com/endoplasmic/google-assistant for more info **/
 const config = {
   auth: {
     keyFilePath: process.env.CLIENT_SECRET
         || "/usr/src/config/client_secret.json",
-    // where you want the tokens to be saved
-    // will create the directory if not already there
     savedTokensPath: process.env.TOKEN || "/usr/src/config/tokens.json"
   },
   conversation: {
     lang: process.env.LANGUAGE || 'en-GB', // defaults to en-GB, but try other ones, it's fun!
-    showDebugInfo: true, // default is false, bug good for testing AoG things,
     isNew: true,
   },
 };
 
 function Assistant() {
+  this.validateFiles = () => {
+    if (!checkFileExistsSync(config.auth.keyFilePath)) {
+      throw Error(
+          `Client Secret file at path '${config.auth.keyFilePath}' does not exist.`)
+    }
+
+    if (!checkFileExistsSync(config.auth.savedTokensPath)) {
+      throw Error(
+          `Tokens file at path '${config.auth.savedTokensPath}' does not exist.`)
+    }
+  }
 
   this.cast = async (message) => {
     const assistant = new GoogleAssistant(config.auth);
     config.conversation.textQuery = `Broadcast ${message}`;
 
-    console.log("Sending message:", config.conversation.textQuery);
+    console.log(`Sending message (${config.conversation.lang}):`,
+        config.conversation.textQuery);
 
     return new Promise((resolve, reject) => {
       assistant
@@ -57,6 +67,18 @@ function Assistant() {
       });
     })
   }
+
+  const checkFileExistsSync = filepath => {
+    let exists = true;
+
+    try {
+      fs.accessSync(filepath, fs.constants.F_OK);
+    } catch (e) {
+      exists = false;
+    }
+
+    return exists;
+  };
 }
 
 module.exports = Assistant;

index.js

@@ -1,12 +1,16 @@
 "use strict";
 
+require('log-timestamp');
 const express = require("express");
 const Assistant = require("./assistant");
 
 const server = express()
 const port = 8085;
 const assistant = new Assistant();
 
+// Validate required files
+assistant.validateFiles()
+
 server.use(express.json())
 
 // Respond only on POST /broadcast route

package.json

@@ -23,6 +23,7 @@
   "homepage": "https://github.com/ismarslomic/google-assistant-broadcast#readme",
   "dependencies": {
     "express": "^4.18.1",
-    "google-assistant": "^0.7.0"
+    "google-assistant": "^0.7.0",
+    "log-timestamp": "^0.3.0"
   }
 }