SimpleStorage

Stateful Smart Contract Application that stores global and local states.

Overview

WHAT WILL WE BE BUILDING

In this workshop, we are going to build a STATEFUL SMART CONTRACT.

• The Application will store basic information of an IoT device during a polling session.
• The IoT device will be sending temperature measurements during the session.
• The Application will capture this information, do some business logic to it, then store
  the results as GLOBAL STATES.
• The last value sent by the device will be stored as LOCAL STATE.

GLOBAL/LOCAL STATES

States	Key	Type	Info
Global	SumOfValues	uint64	Total sum of the values
Global	NumberOfValue	uint64	Total number of values
Local	LastValue	uint64	Last value submitted

Project structure

├── SimpleStorage_Dapp.                     # Dapp project folder
│   ├── index.js                            # Main file of the Dapp
│   └── package.json                        # Configuration file of the node project
└── SimpleStorage_algoDEA                   # algoDEA project folder
    ├── SimpleStorage.iml                   # Configuration file of the IDE
    ├── algo-package.json                   # Configuration file of the Algorand project of the App
    ├── build                               # 
    │   ├── dryrun                          #
    │   │   ├── NewDryRun.dr.json           # Debug file of the TEAL code
    │   │   └── applications.json           # Debug file of the application
    │   └── toks                            #
    │       └── approval_progam.teal.tok    #
    ├── src                                 #
    │   ├── approval_progam.teal            # Approval Program of the App
    │   └── clear_state_program.teal        # Clear State Program of the App
    └── test                                #

Installation

SimpleStorage_algoDEA

There are multiple ways to compile and deploy TEAL smart contract.
However, we highly recommend using IntelliJ IDEA with the algoDEA plugin for ease of use.

Once your environment is ready, follow these steps:

1. Import the SimpleStorage_Dapp project in IntelliJ IDEA
2. Create a new account
3. Fund your account
4. Create the App
5. OptIn {Args}
6. Call (NoOp) {Args}

SimpleStorage_Dapp

1. Install the dependencies.

cd SimpleStorage_Dapp
npm i

2. Run the project.

node index.js

3. You should have an output similar to this:

(base) MBP-de-Ted:SimpleStorage_Dapp tednivan$ node index.js 
Signed transaction with txID: DB3PC3AV5VWPNYRDMD523HE56KN53YIM6PKXT624JH2SHV5LXW5A
Transaction DB3PC3AV5VWPNYRDMD523HE56KN53YIM6PKXT624JH2SHV5LXW5A confirmed in round 14099795
Called app-id: 15834975
Global State updated: [
  { key: 'TnVtYmVyT2ZWYWx1ZXM=', value: { action: 2, uint: 7 } },
  { key: 'U3VtT2ZWYWx1ZXM=', value: { action: 2, uint: 175 } }
]
NumberOfValues : 7
SumOfValues : 175
MeanValue (offchain) : 25
Local State updated: [
  {
    address: 'T7F6HG6SAXJZZ4SQ22ECBBMNDECJ4BYVDEWFDBXF57TNEO3DZQ6Y6MQ7QU',
    delta: [ [Object] ]
  }
]