Add stackdriver logging

package.json

@@ -23,6 +23,7 @@
     "@cobinhood/web3": "1.0.0-beta.35",
     "@dexon-foundation/truffle": "^5.0.15",
     "@dexon-foundation/truffle-contract": "^4.0.12",
+    "@google-cloud/logging-bunyan": "^0.10.1",
     "add-asset-html-webpack-plugin": "^3.1.3",
     "babel-cli": "6.26.0",
     "babel-core": "6.26.3",
@@ -44,6 +45,7 @@
     "babel-preset-react": "6.24.1",
     "babel-preset-stage-0": "6.24.1",
     "bip39": "^3.0.0",
+    "bunyan": "^1.8.12",
     "circular-dependency-plugin": "^5.0.2",
     "css-loader": "0.28.11",
     "eslint": "4.19.1",

runTimer.js

@@ -5,6 +5,28 @@ const { mnemonic } = require('./secret');
 const { address, times } = require('./constants');
 const lottery = require('./build/contracts/Lottery.json');
 
+const bunyan = require('bunyan');
+
+// Imports the Google Cloud client library for Bunyan
+const { LoggingBunyan } = require('@google-cloud/logging-bunyan');
+
+// Creates a Bunyan Stackdriver Logging client
+const loggingBunyan = new LoggingBunyan();
+
+// Create a Bunyan logger that streams to Stackdriver Logging
+// Logs will be written to: "projects/YOUR_PROJECT_ID/logs/bunyan_log"
+const logger = bunyan.createLogger({
+  // The JSON payload of the log as it appears in Stackdriver Logging
+  // will contain "name": "my-service"
+  name: 'dexon-lottery',
+  streams: [
+    // Log to the console at 'info' and above
+    { stream: process.stdout, level: 'info' },
+    // And log to Stackdriver Logging, logging at 'info' and above
+    loggingBunyan.stream('info'),
+  ],
+});
+
 const web3 = new Web3('https://testnet-rpc.dexon.org');
 
 let account;
@@ -21,7 +43,7 @@ const runTime = (time) => {
     gas: 1000000,
   });
 
-  console.log('Revealed for: ', time);
+  logger.info(`Revealed for: ${time}`);
 };
 
 mnemonicToSeed(mnemonic)
@@ -38,3 +60,5 @@ mnemonicToSeed(mnemonic)
 
     times.forEach(runTime);
   });
+
+logger.info('Service started');