Seting up the Environment
First i downloaded python in my windows machine using the link below
The most important thing is to get the build tools necessary for the web3 library in my case i needed V++ 2019 build tools
Use the link bellow and scroll down to Tools for Visual Studio to get the online installer and install the needed version
https://visualstudio.microsoft.com/downloads/?q=build+tools
Get a metamask wallet for the test only and create an account and register down
the passphrase, Account adress, The private keys
in the metamask network section reveal the testnet because we will use rinkbey test for this purpose
Get some etherium for the test using youre metamasc wallet here:
https://www.youtube.com/watch?v=qsvwg-cC928
Create an account in https://infura.io/
Create a project and name it however you like Just dont forget to turn the rinkby network after the creation process.
and write down the Project_id and the Project secret and the first endpoint
If you dont like Infura you can use : https://t.co/Ky3JWP8GPZ
Install Visualstudio code in the link bellow
https://code.visualstudio.com/
Install some usefull extensions for solidity and python
Open a new project and start creatingthose files:
- deploy.py
- SimpleStorage.sol
- .env
create a virtual env and we will name it 'venv' with this command :
py -m venv venv
start using it now with this command each time you you open the powershell with :
venv\Scripts\activate
start installing the necessary libraries
pip install web3
pip install python-dotenv
pip install py-solc-x
SimpleStorage.sol
The code for the SimpleStorage.sol is :
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;
contract SimpleStorage {
uint256 favoriteNumber;
// This is a comment!
struct People {
uint256 favoriteNumber;
string name;
}
People[] public people;
mapping(string => uint256) public nameToFavoriteNumber;
function store(uint256 _favoriteNumber) public {
favoriteNumber = _favoriteNumber;
}
function retrieve() public view returns (uint256){
return favoriteNumber;
}
function addPerson(string memory _name, uint256 _favoriteNumber) public {
people.push(People(_favoriteNumber, _name));
nameToFavoriteNumber[_name] = _favoriteNumber;
}
}
In the code above we just have a favoriteNumber variable that we can check with retrieve function and modify with the store functionand we can associate someone name with a favorite number with addPerson function
Deploy.py
the code of the deploy.pyshould be the same as:
#Necessary
import json
import os
from pathlib import Path
#Security
from dotenv import load_dotenv
#Web3
from solcx import compile_standard, set_solc_version
from web3 import Web3
#Get hidden variables
load_dotenv(Path('.env'))
ENV_TYPE = os.getenv('ENV_TYPE')
#GANACHE
PRIVATE_KEY = os.getenv('PRIVAT_KEY')
ACCOUNT = os.getenv('ACCOUNT')
#INFURA
INFURA_ID = os.getenv('INFURA_ID')
INFURA_SEC = os.getenv('INFURA_SEC')
ENDPOINT_RINKBY = os.getenv('ENDPOINT_RINKBY')
#METAMASK
META_ADRESS = os.getenv('META_ADRESS')
META_PRV = os.getenv('META_PRV')
#SETUP THE CONTRACT
with open(Path('SimpleStorage.sol'), "r") as f:
ss_file = f.read()
_solc_version = "0.6.0"
compiled_ss = compile_standard({
"language":"Solidity","sources": {"SimpleStorage.sol": {"content": ss_file}},
"settings":{
"outputSelection":{
"*":{
"*":["abi", "metadata", "evm.bytecode","evm.sourceMap"]
}
}
}
}, solc_version ="0.6.0")
with open(Path('compiled.json'), 'w' ) as f:
json.dump(compiled_ss, f)
#get bytecode
bytecode= compiled_ss["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["evm"]["bytecode"]["object"]
#get ABI
abi= compiled_ss["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["abi"]
#SETUP PRIVATE KEYS
if ENV_TYPE == "INFURA":
w3 = Web3(Web3.HTTPProvider(ENDPOINT_RINKBY))
chain_id = 4
my_address = META_ADRESS
private_key = META_PRV
else:
w3 = Web3(Web3.HTTPProvider("HTTP://127.0.0.1:8545"))
chain_id = 1337
my_address = ACCOUNT
private_key = PRIVATE_KEY
ss = w3.eth.contract(abi=abi, bytecode=bytecode)
if w3.isConnected():
# print(ss)
#get latest transaction to build the nounce
nonce=w3.eth.getTransactionCount(my_address)
#build transact
#sign
#send transact
deploy_transaction = ss.constructor().buildTransaction({"gasPrice": w3.eth.gas_price,"chainId": chain_id, "from": my_address, "nonce": nonce})
nonce = nonce+1
#Sign transaction
signed_txn = w3.eth.account.sign_transaction(deploy_transaction, private_key=private_key)
#send to blockchain
print("deploying contract ...")
txn_hash = w3.eth.send_raw_transaction( signed_txn.rawTransaction )
tx_receipt = w3.eth.wait_for_transaction_receipt(txn_hash)
print("tx_receipt =>", tx_receipt)
##Contract adress and ABI
contract_adress = tx_receipt.contractAddress
#for interaction
#transact or call
ss_contract = w3.eth.contract(address=contract_adress, abi=abi)
store_transaction = ss_contract.functions.store(7).buildTransaction({"gasPrice": w3.eth.gas_price,"chainId": chain_id, "from": my_address, "nonce": nonce})
signed_store_txn = w3.eth.account.sign_transaction(store_transaction, private_key=private_key)
#send to blockchain
print("interacting with store function ...")
txn_store_hash = w3.eth.send_raw_transaction( signed_store_txn.rawTransaction )
tx_store_receipt = w3.eth.wait_for_transaction_receipt(txn_store_hash)
print("tx_store_receipt =>", tx_store_receipt)
print("---")
print("call retreive =>", ss_contract.functions.retrieve().call())
else:
print("Error not conected")
quit()
In the code above we are creating the smart contractin the blockchain and interacting with it by storing the number 7 in favoriteNumber and the checkingit
.env/Private keys
Now we should fill the necessary keys, you can escape the first two variables because it only needed in a local interaction with Ganache
.env file
ACCOUNT="0xRandom3216547986549687"
PRIVAT_KEY="0xRandom3216547986549687"
INFURA_ID="654random65465"
INFURA_SEC="654random65465"
META_ADRESS="0x654random65465"
META_PRV="654random65465"
ENDPOINT_RINKBY="654random65465"
ENV_TYPE="INFURA"
Deploying/Interaction
You just need a final step is running :
py deploy.py
I hope everything fine
if so check you contract here :
https://rinkeby.etherscan.io/address/write_the_adress_of_the_contract
you can get the contract adress with the info given by youre python output
'contractAddress': '0x21321random321321'
for the needygreedy tutorialplease follow it here:
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