Interact with blockchain and smart contract using truffle

Simple Tutorial explaining how to deploy and interact with smart contract using truffle

Run the code:

Spawn a development blockchain locally:

$ truffle develop

It will automatically start a truffle(develop) CLI.

Deploy the smart contract to the development blockchain:

> migrate --reset

Update data:

> let storage = await SimpleStorage.deployed()
> let data = await storage.updateData(10)

Might get message:

✓ Transaction submitted successfully. Hash: 0x3f6f0e5d0ceca3d0a3ecedf35a1b1ca54873e477f94bf9dedd79e8544dcc5293

Read data:

> let read = await storage.readData()
> read.toString()

Get message: '10'

Useful truffle commands:

To list all the accounts' address:

> let accounts = await web3.eth.getAccounts()
> accounts

'0x722CD3807110b915f97Ef732fa50d9c7Dd024f45',

'0x20f3a0D05b6D28e09259328184a126a28C48ec6d',

.....

find out a account address:

> accounts[0]

'0x722CD3807110b915f97Ef732fa50d9c7Dd024f45'

Create contract instance using specific account with a instance name:

> let myContract2 = await SimpleStorage.new("ss123", {from: accounts[9]})

✓ Transaction submitted successfully. Hash: 0x61e68f5097fdbb6b9f3d20c5509dc391ac1badefb04ff88c43c63730080e898a

Set the data:

> let update = await myContract2.updateData(33)

✓ Transaction submitted successfully. Hash: 0xa9de6b6e76f34227250e4ebfeb59617bd6e8de5e901dc3b42628f09219115123

Read data from another account:

> let read = await myContract2.readData({from: accounts[1]})
> read.toString()

'33'

Or read:

> (await myContract2.readData({from: accounts[1]})).toString()