Solana web3 js

Basic operations on Solana using web3 js.

Libraries:

var web3 = require('@solana/web3.js');
var splToken = require('@solana/spl-token');

Connection and generating keypairs:

const connection = new web3.Connection(
        web3.clusterApiUrl('testnet'),
        'confirmed',
      );
// generate keypair
    var fromWallet = web3.Keypair.generate();
    var toWallet = web3.Keypair.generate();

Get balance:

    console.log(await connection.getBalance(fromWallet.publicKey));
    console.log(await connection.getBalance(toWallet.publicKey));
// add some initial balance. Not possible in production.
    var fromAirdropSignature = await connection.requestAirdrop(
        fromWallet.publicKey,
        1000000000, // lambports
      );
    await connection.confirmTransaction(fromAirdropSignature);
console.log(await connection.getBalance(fromWallet.publicKey));

Transaction:

var transaction = new web3.Transaction().add(
        web3.SystemProgram.transfer({
          fromPubkey: fromWallet.publicKey,
          toPubkey: toWallet.publicKey,
          lamports: 10000,
        }),
      );
// Sign transaction, broadcast, and confirm
      var signature = await web3.sendAndConfirmTransaction(
        connection,
        transaction,
        [fromWallet],
      );
      console.log('SIGNATURE', signature);
console.log(await connection.getBalance(fromWallet.publicKey));
    console.log(await connection.getBalance(toWallet.publicKey));

Multi sign transaction(partialSign)

var feePayerWallet = web3.Keypair.generate();
    var feePayerAirdropSignature = await connection.requestAirdrop(
      feePayerWallet.publicKey,
      1000000000, // lambports
    );
    await connection.confirmTransaction(feePayerAirdropSignature);
var fundedTransaction = new web3.Transaction({
      feePayer: feePayerWallet.publicKey
    }).add(
      web3.SystemProgram.transfer({
        fromPubkey: fromWallet.publicKey,
        toPubkey: toWallet.publicKey,
        lamports: 10000,
      }),
    );
// partially sign transaction
    let blockhashObj = await connection.getRecentBlockhash();
    fundedTransaction.recentBlockhash = await blockhashObj.blockhash;
fundedTransaction.partialSign(fromWallet);
// encoding tranaction so that we can send it to backend
    let endocdeTransction = fundedTransaction.serialize({
      requireAllSignatures: false,
      verifySignatures: false,
    });
// can be transfered over API to backend if required
    endocdeTransction = endocdeTransction.toJSON()
let transactionFromJson = web3.Transaction.from(endcodedTransction);
transactionFromJson.partialSign(feePayerWallet);
const wireTransaction = transactionFromJson.serialize();
      const signature = await this.connection.sendRawTransaction(
        wireTransaction,
      );

Github repo: https://github.com/riddheshganatra/solana-tutorial

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