Supply chain DAPP

A coffee bean supply chain is tracked via this Ethereum DAPP. The DAPP was completed for the Udacity Blockchain Term 2 Project 6 Part B. The diagrams for Part A are in the Coffee Supplly Chain Diagrams section towards the end of this document. The initial skeleton code use in this repository is provided by Udacity from here.

Software Versions Used

• Truffle v4.1.15 (core: 4.1.15)
• Solidity v0.4.25 (solc-js)

Rinkeby Results

The contract addresses and transaction hashs follow.

• Contract Address - 0x779f84144b1eb3fd246643f2a3c0191c28931a7e

Event	Transaction Hash
Harvest	0x01950240a57ce4cfc04ae24626a2d8ca3b76e8a8c9eb4374313acbdd2b1fc919
Process	0x85e7ff00e86dc95adf96c9e32c294c3577a953e2d3b9c24e4491fe5576c97fc2
Pack	0xdc4b04888dd49a141958cb902f514ff68cb7adb56a04180ef983f311c6524562
ForSale	0xa9b6b2d19ff21c296ef197af1767955a22af7136e65a501ab598eeac57305394
Buy	0xed18afbca3109e5373c7594594bab7d476f02f200c4026b6893bc71802f49a8c
Ship	0xfc983d13155907a1f2a7e98d51797fa01acd22bfe5c0d2a0ea6ef44c3cc7fe90
Receive	0xbaa6118809740609cd9b1a1ae821956507bb63d7ea91392b5658c01a59aad704
Purchase	0x508669ba5e69cb11a2641663a1e7a17223291297528889313b29f6d975a8fcc7

Local Test Instructions

• Install the truffle version specified in the Software Version Used section.
• Install the browser extension MetaMask.
• Start the Ganache GUI.
• Import the accounts from the Ganache GUI to metamask.
• If accounts were previously imported and if necessary in MetaMask all the accounts can be reset via Settings->Reset Account.
• All the following commands should be run in the project-6 directory.
• Run the contract tests via: truffle test --network ganachegui.
• Deploy the contract by running either of the following commands: truffle migrate --compile-all --reset --network ganachegui or truffle migrate --compile-all --reset --network rinkeby.
• Start the GUI by running npm run dev.
• Use the web browser button in the following order to verify the contract:
  • Harvest
  • Process
  • Pack
  • ForSale
  • Buy
  • Ship
  • Receive
  • Purchase
  • Fetch Data 1
  • Fetch Data 2
• Note that role IDs shown in the web browser GUI are not used because the metamask role IDs are used.
• Roles can be added via the Add Role section of the web GUI. For repetitive testing the Auto button can be used after the role account ID are updated/hardcoded in addRoles function at the end of app.js.
• The Sequence Diagram show the sequence the contract follows.

Coffee Supplly Chain Diagrams

Sequence

Activity

State

Class

Notes

Can ignore everything below this as I use it as a scratch pad.

Read Student Hub from March 22/2019 on, as I read all previous comments.

Old contract addresses

• 0x028454b782ef787d2848fdc85984e98d008cb6ca