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Presentation link https://aka.ms/Trufflecon2018

Demo code https://github.com/DavidBurela/Trufflecon2018-Demo

Video recording https://www.youtube.com/watch?v=Auf8W5q1I9c

Intro

  • I live in Australia (30 hour travel time to Trufflecon)
  • Blockchain Domain lead @ Microsoft.
  • CSE (Commercial Software Engineering), work with Microsoft's top 400 enterprises globally to help their dev teams be awesome on Azure.
  • Been using Truffle since 2016, I created a lot of the early Truffle on Windows tutorials https://truffleframework.com/tutorials

Dev environment

Ubuntu on Windows (Windows Subsystem for Linux)

Because some npm packages don't run nicely on windows (due to node-gyp), I recommend devs use Ubuntu on Windows.

Demo: show that screenfetch & htop work

Visual Studio Code

Free. Open Source. Runs on Windows / Linux / Mac. Lots of plugins available.

Enterprise truffle usage

Setting up the project

Start with metacoin box as it has things nicely configured

truffle unbox metacoin

PAIN POINT: Truffle boxes missing licensing.

Continuous test runner

PAIN POINT: truffle watch does not work

Need to use a tool like nodemon or chokidar-cli to watch and run tests.

npm install -g chokidar-cli
chokidar 'contracts/*.sol' 'test/*.js' -c 'truffle test' --initial

PAIN POINT: I want a common artifact format across Truffle & Nethereum. Load a metacoin.json file into Nethereum and have it auto detect the ABI & deployed address.

Async tests

PAIN POINT: the sample tests are sync. Async tests are smaller and cleaner.

Change unit tests to async

Blockchain DevOps

Prerequisite: Install truffle as a dev dependency

npm init -y
npm install truffle --save-dev

Azure DevOps Pipeline

Cloud-hosted pipelines for Linux, macOS, and Windows with unlimited minutes and 10 free parallel jobs for open source. https://azure.microsoft.com/en-us/services/devops/pipelines/

Install and configure via GitHub marketplace

https://github.com/marketplace/azure-pipelines

Compile & test

# azure-pipelines.js - npm install, then run the tests
- script: |
    npm install
  displayName: 'npm install'

- script: |
    npx truffle compile
    npx truffle test
  displayName: 'truffle compile & test'

Advanced test results

# Install mocha & junit reporter, allowing output in JUnit XML
npm install truffle mocha mocha-junit-reporter --save-dev
// truffle.js - specify mocha output options
// set the reporter to "spec" to output to terminal, or "mocha-junit-reporter" to output XML
mocha: {
    reporter: "spec",
    reporterOptions: {
      mochaFile: 'TEST-truffle.xml'
    }
  },

PAIN POINT: Need to change test runner manually. Can I pass a param into truffle test to change the test runner.

# azure-pipelines.js

# Insert this before running Truffle Test. This will set the reporter to output junit XML
- script: |
    sed -i -e 's/reporter: "spec"/reporter: "mocha-junit-reporter"/g' truffle.js
  displayName: 'configure mocha to output junit'

# Put this after running Truffle Test. Publishes Test Results in Azure DevOps
- task: PublishTestResults@2
  condition: always()
  inputs:
    testResultsFormat: 'JUnit'
    testResultsFiles: '**/TEST-*.xml' 

break a test and do a pull request

  • modify metacoin.sol to break test
  • check broken code on a branch and push
  • create a pull request

add the build status badge

https://docs.microsoft.com/en-us/azure/devops/pipelines/get-started-yaml?view=vsts#get-the-status-badge

Ethereum on Azure

Automated deployment

npm install truffle-hdwallet-provider --save

PAIN POINT: requires node-gyp. Can we have this web packed like Truffle?

Note: don't put raw mnemonic in truffle.js, use pipeline variables to keep them secret

// truffle.js
var HDWalletProvider = require("truffle-hdwallet-provider");
var mnemonic = "candy maple cake sugar pudding cream honey rich smooth crumble sweet treat";
var networkEndpoint = "http://eth5kzzgs-dns-reg1.westus.cloudapp.azure.com:8540";
// var mnemonic = process.env.deploymentMnemonic;
// var networkEndpoint = process.env.deploymentNetworkEndpoint;


module.exports = {
//...
	networks: {
		azure: {
			provider: function () {
			    return new HDWalletProvider(mnemonic, networkEndpoint, 0)
		},
		gasPrice : 0,
		network_id: "*"
		}
	}
//...
}
- script: |
    npx truffle migrate --network azure
  displayName: 'contract deployment'

PAIN POINT: Once migrations are run, where to store the artifacts? EthPM?

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