Solana Cookbook

Comptes

Comment créer un compte de système

Créez un compte que le Programme du Systèmeopen in new window possède. Le runtime de Solana donnera au propriétaire du compte l'accès à l'écriture des données et au transfert des lamports. Lors de la création d'un compte, nous devons pré-allouer un espace de stockage fixe en bytes (space) et suffisamment de lamports pour couvrir la rente. La Renteopen in new window est un coût encouru pour maintenir les comptes en vie sur Solana.

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import {
  SystemProgram,
  Keypair,
  Transaction,
  sendAndConfirmTransaction,
  Connection,
  clusterApiUrl,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
  const fromPubkey = Keypair.generate();

  // Airdrop SOL for transferring lamports to the created account
  const airdropSignature = await connection.requestAirdrop(
    fromPubkey.publicKey,
    LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(airdropSignature);

  // amount of space to reserve for the account
  const space = 0;

  // Seed the created account with lamports for rent exemption
  const rentExemptionAmount =
    await connection.getMinimumBalanceForRentExemption(space);

  const newAccountPubkey = Keypair.generate();
  const createAccountParams = {
    fromPubkey: fromPubkey.publicKey,
    newAccountPubkey: newAccountPubkey.publicKey,
    lamports: rentExemptionAmount,
    space,
    programId: SystemProgram.programId,
  };

  const createAccountTransaction = new Transaction().add(
    SystemProgram.createAccount(createAccountParams)
  );

  await sendAndConfirmTransaction(connection, createAccountTransaction, [
    fromPubkey,
    newAccountPubkey,
  ]);
})();

use solana_client::rpc_client::RpcClient;
use solana_program::system_instruction;
use solana_sdk::commitment_config::CommitmentConfig;
use solana_sdk::native_token::LAMPORTS_PER_SOL;
use solana_sdk::signature::{Keypair, Signer};

fn main() {
    let rpc_url = String::from("https://api.devnet.solana.com");
    let connection = RpcClient::new_with_commitment(rpc_url, CommitmentConfig::confirmed());

    let from_keypair = Keypair::new();
    let from_pubkey = Signer::pubkey(&from_keypair);

    match connection.request_airdrop(&from_pubkey, LAMPORTS_PER_SOL) {
        Ok(sig) => loop {
            if let Ok(confirmed) = connection.confirm_transaction(&sig) {
                if confirmed {
                    println!("Transaction: {} Status: {}", sig, confirmed);
                    break;
                }
            }
        },
        Err(_) => println!("Error requesting airdrop"),
    };

    let space = 0;
    let rent_exemption_amount = connection
        .get_minimum_balance_for_rent_exemption(space)
        .unwrap();

    let new_account_keypair = Keypair::new();
    let new_account_pubkey = Signer::pubkey(&new_account_keypair);

    let create_account_ix = system_instruction::create_account(
        &from_pubkey,
        &new_account_pubkey,
        rent_exemption_amount,
        space as u64,
        &from_pubkey,
    );

    let (recent_blockhash, _) = connection.get_recent_blockhash().unwrap();

    let create_account_tx = solana_sdk::transaction::Transaction::new_signed_with_payer(
        &[create_account_ix],
        Some(&from_pubkey),
        &[&from_keypair, &new_account_keypair],
        recent_blockhash,
    );

    match connection.send_and_confirm_transaction(&create_account_tx) {
        Ok(sig) => loop {
            if let Ok(confirmed) = connection.confirm_transaction(&sig) {
                if confirmed {
                    println!("Transaction: {} Status: {}", sig, confirmed);
                    break;
                }
            }
        },
        Err(_) => println!("Error creating system account"),
    };
}

Comment calculer les frais de compte

Garder les comptes en vie sur Solana engendre un coût de stockage appelé renteopen in new window. Il est possible de rendre un compte entièrement exempt du paiement de la rente en déposant au moins deux ans de rente. Pour le calcul, vous devez prendre en compte la quantité de données que vous avez l'intention de stocker dans le compte.

import { Connection, clusterApiUrl } from "@solana/web3.js";

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // length of data in the account to calculate rent for
  const dataLength = 1500;
  const rentExemptionAmount =
    await connection.getMinimumBalanceForRentExemption(dataLength);
  console.log({
    rentExemptionAmount,
  });
})();

use solana_client::rpc_client::RpcClient;
use solana_sdk::commitment_config::CommitmentConfig;

fn main() {
    let rpc_url = String::from("https://api.devnet.solana.com");
    let connection = RpcClient::new_with_commitment(rpc_url, CommitmentConfig::confirmed());
    let data_length = 1500;

    let rent_exemption_amount = connection
        .get_minimum_balance_for_rent_exemption(data_length)
        .unwrap();

    println!("rent exemption amount: {}", rent_exemption_amount);
}

solana rent 1500

Comment créer des comptes avec des seeds

Il est possible d'utiliser createAccountWithSeed pour gérer vos comptes au lieu de créer un tas de paires de clés (Keypair) différentes.

Générer

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import { PublicKey, SystemProgram } from "@solana/web3.js";

(async () => {
  let basePubkey = new PublicKey(
    "G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY"
  );
  let seed = "robot001";
  let programId = SystemProgram.programId;

  console.log(
    `${(
      await PublicKey.createWithSeed(basePubkey, seed, programId)
    ).toBase58()}`
  );
})();

use solana_program::pubkey::Pubkey;
use solana_sdk::signature::{Keypair, Signer};

fn main() {
    let base_pubkey = Keypair::new().pubkey();
    let seed = "robot001";
    let program_id = solana_program::system_program::id();

    let derived_pubkey = Pubkey::create_with_seed(&base_pubkey, seed, &program_id).unwrap();

    println!("account pubkey: {:?}", derived_pubkey);
}

Créer

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import {
  PublicKey,
  SystemProgram,
  Connection,
  clusterApiUrl,
  Transaction,
  Keypair,
  sendAndConfirmTransaction,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";
import * as bs58 from "bs58";

(async () => {
  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // 5YNmS1R9nNSCDzb5a7mMJ1dwK9uHeAAF4CmPEwKgVWr8
  const feePayer = Keypair.fromSecretKey(
    bs58.decode(
      "588FU4PktJWfGfxtzpAAXywSNt74AvtroVzGfKkVN1LwRuvHwKGr851uH8czM5qm4iqLbs1kKoMKtMJG4ATR7Ld2"
    )
  );

  // G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY
  const base = Keypair.fromSecretKey(
    bs58.decode(
      "4NMwxzmYj2uvHuq8xoqhY8RXg63KSVJM1DXkpbmkUY7YQWuoyQgFnnzn6yo3CMnqZasnNPNuAT2TLwQsCaKkUddp"
    )
  );

  let basePubkey = base.publicKey;
  let seed = "robot001";
  let programId = SystemProgram.programId;

  let derived = await PublicKey.createWithSeed(basePubkey, seed, programId);

  const tx = new Transaction().add(
    SystemProgram.createAccountWithSeed({
      fromPubkey: feePayer.publicKey, // funder
      newAccountPubkey: derived,
      basePubkey: basePubkey,
      seed: seed,
      lamports: 1e8, // 0.1 SOL
      space: 0,
      programId: programId,
    })
  );

  console.log(
    `txhash: ${await sendAndConfirmTransaction(connection, tx, [
      feePayer,
      base,
    ])}`
  );
})();

use solana_client::rpc_client::RpcClient;
use solana_program::pubkey::Pubkey;
use solana_program::system_instruction;
use solana_sdk::commitment_config::CommitmentConfig;
use solana_sdk::native_token::LAMPORTS_PER_SOL;
use solana_sdk::signature::{Keypair, Signer};

fn main() {
    let rpc_url = String::from("https://api.devnet.solana.com");
    let connection = RpcClient::new_with_commitment(rpc_url, CommitmentConfig::confirmed());

    let fee_payer_keypair = Keypair::new();
    let fee_payer_pubkey = Signer::pubkey(&fee_payer_keypair);

    let base_keypair = Keypair::new();
    let base_pubkey = Signer::pubkey(&base_keypair);

    let seed = "robot001";
    let program_id = solana_program::system_program::id();

    let derived_pubkey = Pubkey::create_with_seed(&base_pubkey, seed, &program_id).unwrap();

    match connection.request_airdrop(&fee_payer_pubkey, LAMPORTS_PER_SOL) {
        Ok(sig) => loop {
            if let Ok(confirmed) = connection.confirm_transaction(&sig) {
                if confirmed {
                    println!("Transaction: {} Status: {}", sig, confirmed);
                    break;
                }
            }
        },
        Err(_) => println!("Error requesting airdrop"),
    };

    let ix = system_instruction::create_account_with_seed(
        &fee_payer_pubkey,
        &derived_pubkey,
        &base_pubkey,
        seed,
        LAMPORTS_PER_SOL / 10,
        0,
        &program_id,
    );

    let (recent_blockhash, _) = connection.get_recent_blockhash().unwrap();

    let tx = solana_sdk::transaction::Transaction::new_signed_with_payer(
        &[ix],
        Some(&fee_payer_pubkey),
        &[&fee_payer_keypair, &base_keypair],
        recent_blockhash,
    );

    match connection.send_and_confirm_transaction(&tx) {
        Ok(sig) => loop {
            if let Ok(confirmed) = connection.confirm_transaction(&sig) {
                if confirmed {
                    println!("Transaction: {} Status: {}", sig, confirmed);
                    break;
                }
            }
        },
        Err(_) => println!("Error creating account with seed"),
    };
}

Transférer

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import {
  PublicKey,
  SystemProgram,
  Connection,
  clusterApiUrl,
  Transaction,
  Keypair,
  sendAndConfirmTransaction,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";
import * as bs58 from "bs58";

(async () => {
  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // 5YNmS1R9nNSCDzb5a7mMJ1dwK9uHeAAF4CmPEwKgVWr8
  const feePayer = Keypair.fromSecretKey(
    bs58.decode(
      "588FU4PktJWfGfxtzpAAXywSNt74AvtroVzGfKkVN1LwRuvHwKGr851uH8czM5qm4iqLbs1kKoMKtMJG4ATR7Ld2"
    )
  );

  // G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY
  const base = Keypair.fromSecretKey(
    bs58.decode(
      "4NMwxzmYj2uvHuq8xoqhY8RXg63KSVJM1DXkpbmkUY7YQWuoyQgFnnzn6yo3CMnqZasnNPNuAT2TLwQsCaKkUddp"
    )
  );

  let basePubkey = base.publicKey;
  let seed = "robot001";
  let programId = SystemProgram.programId;

  let derived = await PublicKey.createWithSeed(basePubkey, seed, programId);

  const tx = new Transaction().add(
    SystemProgram.transfer({
      fromPubkey: derived,
      basePubkey: basePubkey,
      toPubkey: Keypair.generate().publicKey, // create a random receiver
      lamports: 0.01 * LAMPORTS_PER_SOL,
      seed: seed,
      programId: programId,
    })
  );

  console.log(
    `txhash: ${await sendAndConfirmTransaction(connection, tx, [
      feePayer,
      base,
    ])}`
  );
})();

TIP

Seul un compte appartenant au programme du système peut transférer via le programme du système.

Comment créer des PDAs

Les Adresse Dérivées du Programme (PDAs)open in new window sont comme des adresses normales mais avec les différences suivantes :

  1. Elles sont en dehors de la courbe ed25519
  2. Il faut utiliser un programme pour signer au lieu d'une clé privée

Remarque: Les comptes PDAs ne peuvent être créés que dans les programmes. L'adresse peut être créée côté client.

TIP

Bien que le PDA soit dérivé par l'identifiant d'un programme, cela ne signifie pas que le PDA est la propriété de ce programme. (Par exemple, vous pouvez initialiser votre PDA en tant que compte de jetons, qui est un compte appartenant au programme de jetons).

Générer un PDA

findProgramAddress ajoutera un byte supplémentaire à la fin de votre seed. Celui-ci part de 255 jusqu'à 0 et renvoie la première clé publique hors-courbe. Vous obtiendrez toujours le même résultat si vous passez le même identifiant de programme et la même seed.

import { PublicKey } from "@solana/web3.js";

(async () => {
  const programId = new PublicKey(
    "G1DCNUQTSGHehwdLCAmRyAG8hf51eCHrLNUqkgGKYASj"
  );

  let [pda, bump] = await PublicKey.findProgramAddress(
    [Buffer.from("test")],
    programId
  );
  console.log(`bump: ${bump}, pubkey: ${pda.toBase58()}`);
  // you will find the result is different from `createProgramAddress`.
  // It is expected because the real seed we used to calculate is ["test" + bump]
})();

use solana_program::pubkey::Pubkey;
use std::str::FromStr;

fn main() {
    let program_id = Pubkey::from_str("G1DCNUQTSGHehwdLCAmRyAG8hf51eCHrLNUqkgGKYASj").unwrap();

    let (pda, bump_seed) = Pubkey::find_program_address(&[b"test"], &program_id);
    println!("pda: {}, bump: {}", pda, bump_seed);
}

Créer un PDA

Vous trouverez ci-dessous un exemple de programme pour créer un compte PDA appartenant au programme et un exemple pour appeler le programme avec le client.

Programme

L'exemple ci-dessous montre une instruction unique system_instruction::create_account qui crée un compte avec une taille de données allouées space, un montant de lamports rent_lamports pour le PDA dérivé. Ceci est signé avec le PDA en utilisant invoke_signed de façon similaire à ce qui a été dit plus haut.

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use solana_program::{
    account_info::next_account_info, account_info::AccountInfo, entrypoint,
    entrypoint::ProgramResult, program::invoke_signed, pubkey::Pubkey, system_instruction, sysvar::{rent::Rent, Sysvar}
};

entrypoint!(process_instruction);

fn process_instruction(
    program_id: &Pubkey,
    accounts: &[AccountInfo], 
    instruction_data: &[u8],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let payer_account_info = next_account_info(account_info_iter)?;
    let pda_account_info = next_account_info(account_info_iter)?;
    let rent_sysvar_account_info = &Rent::from_account_info(next_account_info(account_info_iter)?)?;

    // find space and minimum rent required for account
    let space = instruction_data[0];
    let bump = instruction_data[1];
    let rent_lamports = rent_sysvar_account_info.minimum_balance(space.into());

    invoke_signed(
        &system_instruction::create_account(
            &payer_account_info.key,
            &pda_account_info.key,
            rent_lamports,
            space.into(),
            program_id
        ),
        &[
            payer_account_info.clone(),
            pda_account_info.clone()
        ],
        &[&[&payer_account_info.key.as_ref(), &[bump]]]
    )?;

    Ok(())
}

Client

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import {
  clusterApiUrl,
  Connection,
  Keypair,
  Transaction,
  SystemProgram,
  PublicKey,
  TransactionInstruction,
  LAMPORTS_PER_SOL,
  SYSVAR_RENT_PUBKEY,
} from "@solana/web3.js";

(async () => {
  // program id
  const programId = new PublicKey(
    "7ZP42kRwUQ2zgbqXoaXzAFaiQnDyp6swNktTSv8mNQGN"
  );

  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // setup fee payer
  const feePayer = Keypair.generate();
  const feePayerAirdropSignature = await connection.requestAirdrop(
    feePayer.publicKey,
    LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(feePayerAirdropSignature);

  // setup pda
  let [pda, bump] = await PublicKey.findProgramAddress(
    [feePayer.publicKey.toBuffer()],
    programId
  );
  console.log(`bump: ${bump}, pubkey: ${pda.toBase58()}`);

  const data_size = 0;

  let tx = new Transaction().add(
    new TransactionInstruction({
      keys: [
        {
          pubkey: feePayer.publicKey,
          isSigner: true,
          isWritable: true,
        },
        {
          pubkey: pda,
          isSigner: false,
          isWritable: true,
        },
        {
          pubkey: SYSVAR_RENT_PUBKEY,
          isSigner: false,
          isWritable: false,
        },
        {
          pubkey: SystemProgram.programId,
          isSigner: false,
          isWritable: false,
        },
      ],
      data: Buffer.from(new Uint8Array([data_size, bump])),
      programId: programId,
    })
  );

  console.log(`txhash: ${await connection.sendTransaction(tx, [feePayer])}`);
})();

Comment signer avec un PDA

Les PDAs ne peuvent être signés que dans un programme. Vous trouverez ci-dessous un exemple de programme permettant de signer avec un PDA et d'appeler le programme avec le client.

Programme

L'exemple ci-dessous montre une instruction unique qui transfère les SOL d'un PDA qui a été dérivé par la graine escrow à un compte. invoke_signed est utilisé pour signer avec le PDA.

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use solana_program::{
    account_info::next_account_info, account_info::AccountInfo, entrypoint,
    entrypoint::ProgramResult, program::invoke_signed, pubkey::Pubkey, system_instruction,
};

entrypoint!(process_instruction);

fn process_instruction(
    _program_id: &Pubkey,
    accounts: &[AccountInfo],
    instruction_data: &[u8],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let pda_account_info = next_account_info(account_info_iter)?;
    let to_account_info = next_account_info(account_info_iter)?;
    let system_program_account_info = next_account_info(account_info_iter)?;

    // pass bump seed for saving compute budget
    let bump_seed = instruction_data[0];

    invoke_signed(
        &system_instruction::transfer(
            &pda_account_info.key,
            &to_account_info.key,
            100_000_000, // 0.1 SOL
        ),
        &[
            pda_account_info.clone(),
            to_account_info.clone(),
            system_program_account_info.clone(),
        ],
        &[&[b"escrow", &[bump_seed]]],
    )?;

    Ok(())
}

Client

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import {
  clusterApiUrl,
  Connection,
  Keypair,
  Transaction,
  SystemProgram,
  PublicKey,
  TransactionInstruction,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";
import * as bs58 from "bs58";

(async () => {
  // program id
  const programId = new PublicKey(
    "4wQC2yuVt4rbcPeYLK8WngqbYLg7UAahVjRFrK3NBjP6"
  );

  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // setup fee payer
  const feePayer = Keypair.generate();
  const feePayerAirdropSignature = await connection.requestAirdrop(
    feePayer.publicKey,
    LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(feePayerAirdropSignature);

  // setup pda
  let [pda, bump] = await PublicKey.findProgramAddress(
    [Buffer.from("escrow")],
    programId
  );
  console.log(`bump: ${bump}, pubkey: ${pda.toBase58()}`);

  // require 1 SOL for the transfering in the program
  const pdaAirdropSignature = await connection.requestAirdrop(
    pda,
    LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(pdaAirdropSignature);

  // create a random `to`
  const to = Keypair.generate();
  console.log(`receiver: ${to.publicKey.toBase58()}`);

  let tx = new Transaction().add(
    new TransactionInstruction({
      keys: [
        {
          pubkey: pda,
          // Leave `false` here although we need a pda as a signer.
          // It will be escalated on program if we use invoke_signed.
          isSigner: false,
          isWritable: true,
        },
        {
          pubkey: to.publicKey,
          isSigner: false,
          isWritable: true,
        },
        {
          pubkey: SystemProgram.programId,
          isSigner: false,
          isWritable: false,
        },
      ],
      data: Buffer.from(new Uint8Array([bump])),
      programId: programId,
    })
  );

  console.log(`txhash: ${await connection.sendTransaction(tx, [feePayer])}`);
})();

Comment obtenir les comptes du programme

Retourne tous les comptes appartenant à un programme. Reportez-vous à la section guides pour plus d'informations sur getProgramAccounts et sa configuration.

import { clusterApiUrl, Connection, PublicKey } from "@solana/web3.js";

(async () => {
  const MY_PROGRAM_ID = new PublicKey(
    "6a2GdmttJdanBkoHt7f4Kon4hfadx4UTUgJeRkCaiL3U"
  );
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  const accounts = await connection.getProgramAccounts(MY_PROGRAM_ID);

  console.log(`Accounts for program ${MY_PROGRAM_ID}: `);
  console.log(accounts);

  /*
  // Output

  Accounts for program 6a2GdmttJdanBkoHt7f4Kon4hfadx4UTUgJeRkCaiL3U:  
  [
    {
      account: {
        data: <Buffer 60 06 66 ca 2c 1d c7 85 04 00 00 00 00 00 00 00 05 00 00 00 00 00 00 00 fc>,
        executable: false,
        lamports: 1064880,
        owner: [PublicKey],
        rentEpoch: 228
      },
      pubkey: PublicKey {
        _bn: <BN: 82fc5b91154dc5c840cb464ba6a89212d0fd789367c0a1488fb1941d78f9727a>
      }
    },
    {
      account: {
        data: <Buffer 60 06 66 ca 2c 1d c7 85 03 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 fd>,
        executable: false,
        lamports: 1064880,
        owner: [PublicKey],
        rentEpoch: 229
      },
      pubkey: PublicKey {
        _bn: <BN: 404dc1fe368cf194f20cf3c681a071c61893ced98f65cda12ba5a147e984e669>
      }
    }
  ]
  */
})();

use solana_client::rpc_client::RpcClient;
use solana_program::pubkey::Pubkey;
use solana_sdk::commitment_config::CommitmentConfig;
use std::str::FromStr;

fn main() {
    let rpc_url = String::from("https://api.devnet.solana.com");
    let connection = RpcClient::new_with_commitment(rpc_url, CommitmentConfig::confirmed());

    let program_id = Pubkey::from_str("6a2GdmttJdanBkoHt7f4Kon4hfadx4UTUgJeRkCaiL3U").unwrap();
    let accounts = connection.get_program_accounts(&program_id).unwrap();

    println!("accounts for {}, {:?}", program_id, accounts);
}

curl https://api.devnet.solana.com -X POST -H "Content-Type: application/json" -d '
 {"jsonrpc":"2.0", "id":1, "method":"getProgramAccounts", "params":["6a2GdmttJdanBkoHt7f4Kon4hfadx4UTUgJeRkCaiL3U"]}
'

# Output
# {"jsonrpc":"2.0","result":[{"account":{"data":"fe2kiXpgfrjWQjCPX3n5MB339Ayqav75ej","executable":false,"lamports":1064880,"owner":"6a2GdmttJdanBkoHt7f4Kon4hfadx4UTUgJeRkCaiL3U","rentEpoch":228},"pubkey":"9pKBrUtJU9GNmct6T2BQtiKqvubtjS9D2if2bm1P8TQd"},{"account":{"data":"fe2kiXpgfrjVs7hiZJNVFsbJUuhXhFx3pQ","executable":false,"lamports":1064880,"owner":"6a2GdmttJdanBkoHt7f4Kon4hfadx4UTUgJeRkCaiL3U","rentEpoch":229},"pubkey":"5L1rztbopmgGMWPKb2efoGyhGnrBJm6K53Hf9S4nxdHr"}],"id":1}

Comment fermer des comptes

Vous pouvez fermer un compte (effacer toutes les données stockées) en retirant tous les SOL détenus par ce compte. (vous pouvez vous référer à renteopen in new window pour plus d'informations)

Programme

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use solana_program::{
    account_info::next_account_info, account_info::AccountInfo, entrypoint,
    entrypoint::ProgramResult, pubkey::Pubkey,
};

entrypoint!(process_instruction);

fn process_instruction(
    _program_id: &Pubkey,
    accounts: &[AccountInfo],
    _instruction_data: &[u8],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let source_account_info = next_account_info(account_info_iter)?;
    let dest_account_info = next_account_info(account_info_iter)?;

    let dest_starting_lamports = dest_account_info.lamports();
    **dest_account_info.lamports.borrow_mut() = dest_starting_lamports
        .checked_add(source_account_info.lamports())
        .unwrap();
    **source_account_info.lamports.borrow_mut() = 0;

    let mut source_data = source_account_info.data.borrow_mut();
    source_data.fill(0);

    Ok(())
}

Client

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import {
  Keypair,
  Connection,
  Transaction,
  SystemProgram,
  TransactionInstruction,
  PublicKey,
  clusterApiUrl,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";

(async function () {
  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // setup fee payer
  const feePayer = Keypair.generate();
  const feePayerAirdropSignature = await connection.requestAirdrop(
    feePayer.publicKey,
    LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(feePayerAirdropSignature);

  // remember to deploy your program first
  const programId = new PublicKey(
    "An47uBJ8kY7hzKPzDyRoFSsDHkZFY9vkfUGpTViWqLFz"
  );

  // 1. create an account to your program
  let newAccount = Keypair.generate();
  console.log(`new account: ${newAccount.publicKey.toBase58()}`);

  let createNewAccountTx = new Transaction().add(
    SystemProgram.createAccount({
      fromPubkey: feePayer.publicKey,
      newAccountPubkey: newAccount.publicKey,
      lamports: 1e8, // 0.1 SOL
      space: 10, // a random value
      programId: programId,
    })
  );
  console.log(
    `create account txhash: ${await connection.sendTransaction(
      createNewAccountTx,
      [feePayer, newAccount]
    )}`
  );

  // 2. close your account
  let closeAccountTx = new Transaction().add(
    new TransactionInstruction({
      keys: [
        {
          pubkey: newAccount.publicKey,
          isSigner: false,
          isWritable: true,
        },
        {
          pubkey: feePayer.publicKey,
          isSigner: false,
          isWritable: true,
        },
      ],
      programId: programId,
    })
  );
  console.log(
    `close account txhash: ${await connection.sendTransaction(closeAccountTx, [
      feePayer,
    ])}`
  );
})();

Comment obtenir le solde d'un compte

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import {
  clusterApiUrl,
  Connection,
  PublicKey,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  let wallet = new PublicKey("G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY");
  console.log(
    `${(await connection.getBalance(wallet)) / LAMPORTS_PER_SOL} SOL`
  );
})();

use solana_client::rpc_client::RpcClient;
use solana_program::native_token::LAMPORTS_PER_SOL;
use solana_program::pubkey::Pubkey;
use solana_sdk::commitment_config::CommitmentConfig;
use std::str::FromStr;

fn main() {
    let rpc_url = String::from("https://api.devnet.solana.com");
    let connection = RpcClient::new_with_commitment(rpc_url, CommitmentConfig::confirmed());

    let wallet = Pubkey::from_str("G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY").unwrap();
    let balance = connection.get_balance(&wallet).unwrap();

    println!(
        "The account {}, has {} SOL ",
        wallet,
        balance / LAMPORTS_PER_SOL
    );
}

from solana.publickey import Keypair
from solana.rpc.api import Client

client = Client("https://api.devnet.solana.com")

key_pair = Keypair()
public_key = key_pair.public_key

print(client.get_balance(public_key))

TIP

Si vous voulez obtenir un solde de jetons, vous devez connaître l'adresse du compte de jetons. Pour plus d'informations, voir Références des Jetons

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