Jumlah UI Terskala

Apa Itu Ekstensi Scaled UI Amount?

Ekstensi mint ScaledUiAmount dari Token Extensions Program memungkinkan sebuah mint menerapkan pengali yang dapat diperbarui pada jumlah UI yang ditampilkan untuk saldo token.

Ini berguna ketika sebuah token mewakili aset atau instrumen dunia nyata, seperti pemecahan saham atau dividen. Misalnya, pemecahan saham menggandakan jumlah saham untuk semua pemegang. Tanpa mengubah saldo setiap token account, ScaledUiAmount memungkinkan dompet dan aplikasi menampilkan jumlah UI baru menggunakan pengali dari mint.

Fitur ini juga dapat digunakan untuk dividen atau mendistribusikan hasil.

Tidak ada token baru yang dibuat. Jumlah token yang tersimpan dalam token account tetap sama. Hanya jumlah UI yang ditampilkan yang berubah.

Ekstensi Tidak Kompatibel

Jangan aktifkan ScaledUiAmount dan InterestBearingConfig pada mint yang sama. Token Extensions Program menolak kombinasi ekstensi tersebut.

Cara Kerja Scaled UI Amount

  • ScaledUiAmountConfig menyimpan otoritas pembaruan, multiplier, new_multiplier, dan new_multiplier_effective_timestamp.
  • Sebelum new_multiplier_effective_timestamp, konversi menggunakan multiplier. Pada atau setelah timestamp tersebut, konversi menggunakan new_multiplier.
  • UpdateMultiplier dapat menerapkan pengali baru secara langsung atau menjadwalkannya untuk timestamp Unix di masa mendatang.
  • AmountToUiAmount, UiAmountToAmount, dan helper konversi ekstensi menggunakan aritmatika floating-point untuk scaled UI amount mint, sehingga konversi tidak dijamin untuk round-trip secara tepat.

Cara Menggunakan Scaled UI Amount

Untuk menggunakan scaled UI amount:

  1. Hitung ukuran mint account dan rent yang diperlukan untuk mint dan ekstensi ScaledUiAmount.
  2. Buat mint account dengan CreateAccount, inisialisasi ScaledUiAmount, dan inisialisasi mint dengan InitializeMint.
  3. Gunakan AmountToUiAmount, UiAmountToAmount, atau helper klien saat menampilkan saldo atau mengonversi jumlah UI.
  4. Gunakan UpdateMultiplier untuk memperbarui pengali yang ditampilkan secara langsung atau pada timestamp Unix di masa mendatang.

Urutan Instruksi

ScaledUiAmountMintInstruction::Initialize harus dilakukan sebelum InitializeMint. CreateAccount, ScaledUiAmountMintInstruction::Initialize, dan InitializeMint harus disertakan dalam transaksi yang sama.

Panduan

Referensi Sumber

ItemDeskripsiSumber
ScaledUiAmountConfigStatus ekstensi mint yang menyimpan otoritas, pengali saat ini, pengali berikutnya, dan timestamp saat mulai berlaku.Sumber
ScaledUiAmountMintInstruction::InitializeInstruksi yang menginisialisasi ScaledUiAmount pada mint sebelum InitializeMint.Sumber
ScaledUiAmountMintInstruction::UpdateMultiplierInstruksi yang menetapkan pengali baru dan timestamp Unix saat mulai berlaku.Sumber
amount_to_ui_amountPembantu yang mengonversi jumlah token menjadi string jumlah UI menggunakan pengali saat ini, desimal, dan timestamp.Sumber
try_ui_amount_into_amountPembantu yang mengonversi string jumlah UI kembali menjadi jumlah token menggunakan pengali saat ini, desimal, dan timestamp.Sumber
process_initializeProsesor yang menginisialisasi ScaledUiAmountConfig dan menyimpan pengali awal pada mint yang belum diinisialisasi.Sumber
process_update_multiplierProsesor yang memvalidasi otoritas, memperbarui pengali terjadwal, dan menerapkannya segera bila sesuai.Sumber
process_amount_to_ui_amountJalur konversi Token Program yang menggunakan ScaledUiAmountConfig ketika mint memiliki ekstensi yang diaktifkan.Sumber
process_ui_amount_to_amountJalur konversi Token Program yang mengonversi jumlah UI kembali menjadi jumlah token untuk mint scaled UI amount.Sumber

Typescript

Contoh Kit di bawah ini menggunakan instruksi yang dihasilkan secara langsung. Contoh lama yang menggunakan @solana/web3.js dan @solana/spl-token disertakan sebagai referensi.

Kit

Instructions
import {
lamports,
createClient,
generateKeyPairSigner,
unwrapOption
} from "@solana/kit";
import { solanaRpc, rpcAirdrop } from "@solana/kit-plugin-rpc";
import { generatedPayer, airdropPayer } from "@solana/kit-plugin-signer";
import { getCreateAccountInstruction } from "@solana-program/system";
import {
amountToUiAmountForMintWithoutSimulation,
extension,
fetchMint,
findAssociatedTokenPda,
getCreateAssociatedTokenInstructionAsync,
getInitializeMintInstruction,
getInitializeScaledUiAmountMintInstruction,
getMintSize,
getMintToCheckedInstruction,
getUpdateMultiplierScaledUiMintInstruction,
isExtension,
TOKEN_2022_PROGRAM_ADDRESS
} from "@solana-program/token-2022";
const client = await createClient()
.use(generatedPayer())
.use(
solanaRpc({
rpcUrl: "http://localhost:8899",
rpcSubscriptionsUrl: "ws://localhost:8900"
})
)
.use(rpcAirdrop())
.use(airdropPayer(lamports(1_000_000_000n)));
const mint = await generateKeyPairSigner();
const recipient = await generateKeyPairSigner();
const initialMultiplier = 5.0;
const updatedMultiplier = 10.0;
const tokenAmount = 1_000n;
const scaledUiAmountExtension = extension("ScaledUiAmountConfig", {
authority: client.payer.address,
multiplier: initialMultiplier,
newMultiplierEffectiveTimestamp: 0n,
newMultiplier: initialMultiplier
});
const mintSpace = BigInt(getMintSize([scaledUiAmountExtension]));
const mintRent = await client.rpc
.getMinimumBalanceForRentExemption(mintSpace)
.send();
await client.sendTransaction([
getCreateAccountInstruction({
payer: client.payer, // Account funding the new mint account.
newAccount: mint, // New mint account to create.
lamports: mintRent, // Lamports funding the mint account rent.
space: mintSpace, // Account size in bytes for the mint plus ScaledUiAmountConfig.
programAddress: TOKEN_2022_PROGRAM_ADDRESS // Program that owns the mint account.
}),
getInitializeScaledUiAmountMintInstruction({
mint: mint.address, // Mint account that stores the ScaledUiAmountConfig extension.
authority: client.payer.address, // Authority allowed to update the multiplier later.
multiplier: initialMultiplier // Initial multiplier used for displayed UI amounts.
}),
getInitializeMintInstruction({
mint: mint.address, // Mint account to initialize.
decimals: 0, // Number of decimals for the token.
mintAuthority: client.payer.address, // Authority allowed to mint new tokens.
freezeAuthority: client.payer.address // Authority allowed to freeze token accounts.
})
]);
const [tokenAccount] = await findAssociatedTokenPda({
mint: mint.address,
owner: recipient.address,
tokenProgram: TOKEN_2022_PROGRAM_ADDRESS
});
await client.sendTransaction([
await getCreateAssociatedTokenInstructionAsync({
payer: client.payer, // Account funding the associated token account creation.
mint: mint.address, // Mint for the associated token account.
owner: recipient.address // Owner of the token account.
}),
getMintToCheckedInstruction({
mint: mint.address, // Mint account that issues the tokens.
token: tokenAccount, // Token account receiving the newly minted tokens.
mintAuthority: client.payer, // Signer authorized to mint new tokens.
amount: tokenAmount, // Token amount in base units.
decimals: 0 // Decimals defined on the mint.
})
]);
const calculatedUiAmountBeforeUpdate =
await amountToUiAmountForMintWithoutSimulation(
client.rpc,
mint.address,
tokenAmount
);
const updateMultiplierInstruction = getUpdateMultiplierScaledUiMintInstruction({
mint: mint.address, // Mint account that stores the ScaledUiAmountConfig extension.
authority: client.payer, // Signer authorized to update the multiplier.
multiplier: updatedMultiplier, // New multiplier used for displayed UI amounts.
effectiveTimestamp: 0n // Unix timestamp when the new multiplier takes effect.
});
await client.sendTransaction([updateMultiplierInstruction]);
const calculatedUiAmountAfterUpdate =
await amountToUiAmountForMintWithoutSimulation(
client.rpc,
mint.address,
tokenAmount
);
const mintAccount = await fetchMint(client.rpc, mint.address);
const scaledUiAmountConfig = (
unwrapOption(mintAccount.data.extensions) ?? []
).find((item) => isExtension("ScaledUiAmountConfig", item));
console.log("Mint Address:", mint.address);
console.log("Token Account:", tokenAccount);
console.log(
"Calculated UI Amount Before Update:",
calculatedUiAmountBeforeUpdate
);
console.log(
"Calculated UI Amount After Update:",
calculatedUiAmountAfterUpdate
);
console.log("ScaledUiAmountConfig:", scaledUiAmountConfig);
Console
Click to execute the code.

Web3.js

Instructions
import {
Connection,
Keypair,
PublicKey,
sendAndConfirmTransaction,
SystemProgram,
Transaction,
LAMPORTS_PER_SOL
} from "@solana/web3.js";
import {
ASSOCIATED_TOKEN_PROGRAM_ID,
createAssociatedTokenAccountInstruction,
createInitializeMintInstruction,
createInitializeScaledUiAmountConfigInstruction,
createMintToCheckedInstruction,
createUpdateMultiplierDataInstruction,
ExtensionType,
getAssociatedTokenAddressSync,
getMint,
getMintLen,
getScaledUiAmountConfig,
TOKEN_2022_PROGRAM_ID
} from "@solana/spl-token";
async function calculateScaledUiAmount(
connection: Connection,
mintPublicKey: PublicKey,
tokenAmount: bigint
) {
const mintAccount = await getMint(
connection,
mintPublicKey,
"confirmed",
TOKEN_2022_PROGRAM_ID
);
const scaledUiAmountConfig = getScaledUiAmountConfig(mintAccount);
if (!scaledUiAmountConfig) {
throw new Error("ScaledUiAmountConfig not found");
}
const clockAccount = await connection.getParsedAccountInfo(
new PublicKey("SysvarC1ock11111111111111111111111111111111")
);
if (
!clockAccount.value ||
typeof clockAccount.value.data !== "object" ||
!("parsed" in clockAccount.value.data)
) {
throw new Error("Failed to fetch clock sysvar");
}
const unixTimestamp = Number(
clockAccount.value.data.parsed.info.unixTimestamp
);
const multiplier =
unixTimestamp >=
Number(scaledUiAmountConfig.newMultiplierEffectiveTimestamp)
? scaledUiAmountConfig.newMultiplier
: scaledUiAmountConfig.multiplier;
const scaledAmount = Math.trunc(Number(tokenAmount) * multiplier);
const calculatedUiAmount = scaledAmount / 10 ** mintAccount.decimals;
return {
calculatedUiAmount: calculatedUiAmount.toString(),
scaledUiAmountConfig
};
}
const connection = new Connection("http://localhost:8899", "confirmed");
const feePayer = Keypair.generate();
const recipient = Keypair.generate();
const initialMultiplier = 5.0;
const updatedMultiplier = 10.0;
const tokenAmount = 1_000n;
const airdropSignature = await connection.requestAirdrop(
feePayer.publicKey,
2 * LAMPORTS_PER_SOL
);
await connection.confirmTransaction(airdropSignature, "confirmed");
const mint = Keypair.generate();
const mintLength = getMintLen([ExtensionType.ScaledUiAmountConfig]);
const mintRent = await connection.getMinimumBalanceForRentExemption(mintLength);
const tokenAccount = getAssociatedTokenAddressSync(
mint.publicKey,
recipient.publicKey,
false,
TOKEN_2022_PROGRAM_ID,
ASSOCIATED_TOKEN_PROGRAM_ID
);
const createMintAccountInstruction = SystemProgram.createAccount({
fromPubkey: feePayer.publicKey, // Account funding the new mint account.
newAccountPubkey: mint.publicKey, // New mint account to create.
space: mintLength, // Account size in bytes for the mint plus ScaledUiAmountConfig.
lamports: mintRent, // Lamports funding the mint account rent.
programId: TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
});
const initializeScaledUiAmountInstruction =
createInitializeScaledUiAmountConfigInstruction(
mint.publicKey, // Mint account that stores the ScaledUiAmountConfig extension.
feePayer.publicKey, // Authority allowed to update the multiplier later.
initialMultiplier, // Initial multiplier used for displayed UI amounts.
TOKEN_2022_PROGRAM_ID // Token program that owns the mint.
);
const initializeMintInstruction = createInitializeMintInstruction(
mint.publicKey, // Mint account to initialize.
0, // Number of decimals for the token.
feePayer.publicKey, // Authority allowed to mint new tokens.
feePayer.publicKey, // Authority allowed to freeze token accounts.
TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
);
await sendAndConfirmTransaction(
connection,
new Transaction().add(
createMintAccountInstruction,
initializeScaledUiAmountInstruction,
initializeMintInstruction
),
[feePayer, mint]
);
const createTokenAccountInstruction = createAssociatedTokenAccountInstruction(
feePayer.publicKey, // Account funding the associated token account creation.
tokenAccount, // Associated token account address to create.
recipient.publicKey, // Owner of the token account.
mint.publicKey, // Mint for the associated token account.
TOKEN_2022_PROGRAM_ID, // Token program that owns the token account.
ASSOCIATED_TOKEN_PROGRAM_ID // Associated Token Program that creates the account.
);
const mintToTokenAccountInstruction = createMintToCheckedInstruction(
mint.publicKey, // Mint account that issues the tokens.
tokenAccount, // Token account receiving the newly minted tokens.
feePayer.publicKey, // Signer authorized to mint new tokens.
tokenAmount, // Token amount in base units.
0, // Decimals defined on the mint.
[], // Additional multisig signers.
TOKEN_2022_PROGRAM_ID // Token program that owns the mint and token account.
);
await sendAndConfirmTransaction(
connection,
new Transaction().add(
createTokenAccountInstruction,
mintToTokenAccountInstruction
),
[feePayer]
);
const { calculatedUiAmount: calculatedUiAmountBeforeUpdate } =
await calculateScaledUiAmount(connection, mint.publicKey, tokenAmount);
const updateMultiplierInstruction = createUpdateMultiplierDataInstruction(
mint.publicKey, // Mint account that stores the ScaledUiAmountConfig extension.
feePayer.publicKey, // Signer authorized to update the multiplier.
updatedMultiplier, // New multiplier used for displayed UI amounts.
0n, // Unix timestamp when the new multiplier takes effect.
[], // Additional multisig signers.
TOKEN_2022_PROGRAM_ID // Token program that owns the mint.
);
await sendAndConfirmTransaction(
connection,
new Transaction().add(updateMultiplierInstruction),
[feePayer]
);
const {
calculatedUiAmount: calculatedUiAmountAfterUpdate,
scaledUiAmountConfig
} = await calculateScaledUiAmount(connection, mint.publicKey, tokenAmount);
console.log("Mint Address:", mint.publicKey.toBase58());
console.log("Token Account:", tokenAccount.toBase58());
console.log(
"Calculated UI Amount Before Update:",
calculatedUiAmountBeforeUpdate
);
console.log(
"Calculated UI Amount After Update:",
calculatedUiAmountAfterUpdate
);
console.log("ScaledUiAmountConfig:", scaledUiAmountConfig);
Console
Click to execute the code.

Rust

Rust
use anyhow::Result;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_commitment_config::CommitmentConfig;
use solana_sdk::{
sysvar::clock::{self, Clock},
signature::{Keypair, Signer},
transaction::Transaction,
};
use solana_system_interface::instruction::create_account;
use spl_associated_token_account_interface::{
address::get_associated_token_address_with_program_id,
instruction::create_associated_token_account,
};
use spl_token_2022_interface::{
extension::{
scaled_ui_amount::{instruction, ScaledUiAmountConfig},
BaseStateWithExtensions, ExtensionType, StateWithExtensions,
},
instruction::{initialize_mint, mint_to_checked},
state::Mint,
ID as TOKEN_2022_PROGRAM_ID,
};
#[tokio::main]
async fn main() -> Result<()> {
let client = RpcClient::new_with_commitment(
String::from("http://localhost:8899"),
CommitmentConfig::confirmed(),
);
let fee_payer = Keypair::new();
let recipient = Keypair::new();
let initial_multiplier = 5.0;
let updated_multiplier = 10.0;
let token_amount = 1_000u64;
let airdrop_signature = client
.request_airdrop(&fee_payer.pubkey(), 2_000_000_000)
.await?;
loop {
let confirmed = client.confirm_transaction(&airdrop_signature).await?;
if confirmed {
break;
}
}
let mint = Keypair::new();
let mint_space =
ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::ScaledUiAmount])?;
let mint_rent = client
.get_minimum_balance_for_rent_exemption(mint_space)
.await?;
let create_mint_account_instruction = create_account(
&fee_payer.pubkey(), // Account funding the new mint account.
&mint.pubkey(), // New mint account to create.
mint_rent, // Lamports funding the mint account rent.
mint_space as u64, // Account size in bytes for the mint plus ScaledUiAmountConfig.
&TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
);
let initialize_scaled_ui_amount_instruction = instruction::initialize(
&TOKEN_2022_PROGRAM_ID, // Token program that owns the mint.
&mint.pubkey(), // Mint account that stores the ScaledUiAmountConfig extension.
Some(fee_payer.pubkey()), // Authority allowed to update the multiplier later.
initial_multiplier, // Initial multiplier used for displayed UI amounts.
)?;
let initialize_mint_instruction = initialize_mint(
&TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
&mint.pubkey(), // Mint account to initialize.
&fee_payer.pubkey(), // Authority allowed to mint new tokens.
Some(&fee_payer.pubkey()), // Authority allowed to freeze token accounts.
0, // Number of decimals for the token.
)?;
let create_mint_transaction = Transaction::new_signed_with_payer(
&[
create_mint_account_instruction,
initialize_scaled_ui_amount_instruction,
initialize_mint_instruction,
],
Some(&fee_payer.pubkey()),
&[&fee_payer, &mint],
client.get_latest_blockhash().await?,
);
client
.send_and_confirm_transaction(&create_mint_transaction)
.await?;
let token_account = get_associated_token_address_with_program_id(
&recipient.pubkey(),
&mint.pubkey(),
&TOKEN_2022_PROGRAM_ID,
);
let create_token_account_instruction = create_associated_token_account(
&fee_payer.pubkey(), // Account funding the associated token account creation.
&recipient.pubkey(), // Owner of the token account.
&mint.pubkey(), // Mint for the associated token account.
&TOKEN_2022_PROGRAM_ID, // Token program that owns the token account.
);
let mint_to_token_account_instruction = mint_to_checked(
&TOKEN_2022_PROGRAM_ID, // Token program that owns the mint and token account.
&mint.pubkey(), // Mint account that issues the tokens.
&token_account, // Token account receiving the newly minted tokens.
&fee_payer.pubkey(), // Signer authorized to mint new tokens.
&[], // Additional multisig signers.
token_amount, // Token amount in base units.
0, // Decimals defined on the mint.
)?;
let create_token_account_transaction = Transaction::new_signed_with_payer(
&[
create_token_account_instruction,
mint_to_token_account_instruction,
],
Some(&fee_payer.pubkey()),
&[&fee_payer],
client.get_latest_blockhash().await?,
);
client
.send_and_confirm_transaction(&create_token_account_transaction)
.await?;
let mint_account_before_update = client.get_account(&mint.pubkey()).await?;
let mint_state_before_update = StateWithExtensions::<Mint>::unpack(&mint_account_before_update.data)?;
let scaled_ui_amount_config_before_update =
mint_state_before_update.get_extension::<ScaledUiAmountConfig>()?;
let clock_account = client.get_account(&clock::ID).await?;
let clock: Clock = clock_account.deserialize_data()?;
let calculated_ui_amount_before_update = scaled_ui_amount_config_before_update
.amount_to_ui_amount(
token_amount,
mint_state_before_update.base.decimals,
clock.unix_timestamp,
)
.unwrap();
let update_multiplier_instruction = instruction::update_multiplier(
&TOKEN_2022_PROGRAM_ID, // Token program that owns the mint.
&mint.pubkey(), // Mint account that stores the ScaledUiAmountConfig extension.
&fee_payer.pubkey(), // Signer authorized to update the multiplier.
&[], // Additional multisig signers.
updated_multiplier, // New multiplier used for displayed UI amounts.
0, // Unix timestamp when the new multiplier takes effect.
)?;
let update_multiplier_transaction = Transaction::new_signed_with_payer(
&[update_multiplier_instruction],
Some(&fee_payer.pubkey()),
&[&fee_payer],
client.get_latest_blockhash().await?,
);
client
.send_and_confirm_transaction(&update_multiplier_transaction)
.await?;
let mint_account_after_update = client.get_account(&mint.pubkey()).await?;
let mint_state_after_update = StateWithExtensions::<Mint>::unpack(&mint_account_after_update.data)?;
let scaled_ui_amount_config_after_update =
mint_state_after_update.get_extension::<ScaledUiAmountConfig>()?;
let calculated_ui_amount_after_update = scaled_ui_amount_config_after_update
.amount_to_ui_amount(
token_amount,
mint_state_after_update.base.decimals,
clock.unix_timestamp,
)
.unwrap();
println!("Mint Address: {}", mint.pubkey());
println!("Token Account: {}", token_account);
println!(
"Calculated UI Amount Before Update: {}",
calculated_ui_amount_before_update
);
println!(
"Calculated UI Amount After Update: {}",
calculated_ui_amount_after_update
);
println!("ScaledUiAmountConfig: {:#?}", scaled_ui_amount_config_after_update);
Ok(())
}
Console
Click to execute the code.

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