NodeJS Script
WEB3.JS - NodeJS Script
Smart contracts can be deployed with just the use of web3.js as well. Below you will find a simple script for using NodeJS and web3.
NOTE: Web3 and solc versions matter for compatibility. Web3 1.0.0-beta.35 and solc version 0.5.4 work well together, but other version combinations can cause unexpected errors.
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/*
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* This nodeJS script will deploy your smart contracts to your new S-Chain.
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*
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* @param {String} private key - Provide your private key.
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* @param {String} account - Provide your account address.
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* @param {String} SKALE Chain endpoint - provide your SKALE Chain endpoint
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* @param {String} contractName - Name of your smart contract (i.e. MySmartContract)
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* @param {String} contractFileName - Complete filename of contract (i.e. MySmartContract.sol)
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*/
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const Web3 = require('web3'); // version 1.0.0-beta.35
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const solc = require('solc'); // version 0.5.4
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const path = require('path');
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const fs = require('fs');
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let privateKey = "[YOUR_PRIVATE_KEY]";
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let account = "[YOUR_ACCOUNT_ADDRESS]";
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let schainEndpoint = "[YOUR_SKALE_CHAIN_ENDPOINT]";
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let contractName = "HelloSKALE"; //replace with your contract name
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let contractFileName = "HelloSKALE.sol"; //replace with the filename of the contract
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//Retrieve and compile contract source code
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const contractPath = path.resolve(__dirname, 'contracts', contractFileName);
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const contractContent = fs.readFileSync(contractPath, 'UTF-8');
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//Format contract for solc reader
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var contracts = {
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language: 'Solidity',
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sources: {},
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settings: {
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outputSelection: {
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'*': {
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'*': [ '*' ]
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}
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}
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}
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}
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//add HelloSKALE contract to contract sources
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contracts.sources[contractFileName] = { content: contractContent };
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//compile data via solc reader
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let solcOutput = JSON.parse(solc.compile(JSON.stringify(contracts)));
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//get compile HelloSKALE contract
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let contractCompiled = solcOutput.contracts[contractFileName][contractName];
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//Connect Web3 to your SKALE Chain
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const web3 = new Web3(new Web3.providers.HttpProvider(schainEndpoint));
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//create transaction
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var tx = {
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data : '0x' + contractCompiled.evm.bytecode.object,
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from: account,
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gasPrice: 0,
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gas: 80000000
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};
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//sign transaction to deploy contract
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web3.eth.accounts.signTransaction(tx, privateKey).then(signed => {
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web3.eth.sendSignedTransaction(signed.rawTransaction).
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on('receipt', receipt => {
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console.log(receipt)
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}).
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catch(console.error);
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});
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