anchor interestbearing example

tokens/token-2022/interest-bearing/anchor/.gitignore

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+.anchor
+.DS_Store
+target
+**/*.rs.bk
+node_modules
+test-ledger
+.yarn

tokens/token-2022/interest-bearing/anchor/.prettierignore

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+.anchor
+.DS_Store
+target
+node_modules
+dist
+build
+test-ledger

tokens/token-2022/interest-bearing/anchor/Anchor.toml

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+[toolchain]
+
+[features]
+resolution = true
+skip-lint = false
+
+[programs.localnet]
+interest_bearing = "DMQdkzRJz8uQSN8Kx2QYmQJn6xLKhsu3LcPYxs314MgC"
+
+[registry]
+url = "https://api.apr.dev"
+
+[provider]
+cluster = "Localnet"
+wallet = "~/.config/solana/id.json"
+
+[scripts]
+test = "yarn run ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"

tokens/token-2022/interest-bearing/anchor/Cargo.toml

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+[workspace]
+members = [
+    "programs/*"
+]
+resolver = "2"
+
+[profile.release]
+overflow-checks = true
+lto = "fat"
+codegen-units = 1
+[profile.release.build-override]
+opt-level = 3
+incremental = false
+codegen-units = 1

tokens/token-2022/interest-bearing/anchor/migrations/deploy.ts

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+// Migrations are an early feature. Currently, they're nothing more than this
+// single deploy script that's invoked from the CLI, injecting a provider
+// configured from the workspace's Anchor.toml.
+
+const anchor = require("@coral-xyz/anchor");
+
+module.exports = async function (provider) {
+  // Configure client to use the provider.
+  anchor.setProvider(provider);
+
+  // Add your deploy script here.
+};

tokens/token-2022/interest-bearing/anchor/package.json

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+{
+  "scripts": {
+    "lint:fix": "prettier */*.js \"*/**/*{.js,.ts}\" -w",
+    "lint": "prettier */*.js \"*/**/*{.js,.ts}\" --check"
+  },
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.30.0",
+    "@solana/spl-token": "^0.4.6"
+  },
+  "devDependencies": {
+    "@types/bn.js": "^5.1.0",
+    "@types/chai": "^4.3.0",
+    "@types/mocha": "^9.0.0",
+    "chai": "^4.3.4",
+    "mocha": "^9.0.3",
+    "prettier": "^2.6.2",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  }
+}

tokens/token-2022/interest-bearing/anchor/programs/interest-bearing/Cargo.toml

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+[package]
+name = "interest-bearing"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "interest_bearing"
+
+[features]
+default = []
+cpi = ["no-entrypoint"]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+idl-build = ["anchor-lang/idl-build", "anchor-spl/idl-build"]
+
+[dependencies]
+anchor-lang = "0.30.0"
+anchor-spl = "0.30.0"

tokens/token-2022/interest-bearing/anchor/programs/interest-bearing/Xargo.toml

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+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

tokens/token-2022/interest-bearing/anchor/programs/interest-bearing/src/lib.rs

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+use anchor_lang::prelude::*;
+use anchor_lang::system_program::{create_account, CreateAccount};
+use anchor_spl::{
+    token_2022::{
+        initialize_mint2,
+        spl_token_2022::{
+            extension::{
+                interest_bearing_mint::InterestBearingConfig, BaseStateWithExtensions,
+                ExtensionType, StateWithExtensions,
+            },
+            pod::PodMint,
+            state::Mint as MintState,
+        },
+        InitializeMint2,
+    },
+    token_interface::{
+        interest_bearing_mint_initialize, interest_bearing_mint_update_rate,
+        spl_pod::optional_keys::OptionalNonZeroPubkey, InterestBearingMintInitialize,
+        InterestBearingMintUpdateRate, Mint, Token2022,
+    },
+};
+declare_id!("DMQdkzRJz8uQSN8Kx2QYmQJn6xLKhsu3LcPYxs314MgC");
+
+#[program]
+pub mod interest_bearing {
+
+    use super::*;
+
+    pub fn initialize(ctx: Context<Initialize>, rate: i16) -> Result<()> {
+        // Calculate space required for mint and extension data
+        let mint_size = ExtensionType::try_calculate_account_len::<PodMint>(&[
+            ExtensionType::InterestBearingConfig,
+        ])
+        .unwrap();
+
+        // Calculate minimum lamports required for size of mint account with extensions
+        let lamports = (Rent::get()?).minimum_balance(mint_size);
+
+        // Invoke System Program to create new account with space for mint and extension data
+        create_account(
+            CpiContext::new(
+                ctx.accounts.system_program.to_account_info(),
+                CreateAccount {
+                    from: ctx.accounts.payer.to_account_info(),
+                    to: ctx.accounts.mint_account.to_account_info(),
+                },
+            ),
+            lamports,                          // Lamports
+            mint_size as u64,                  // Space
+            &ctx.accounts.token_program.key(), // Owner Program
+        )?;
+
+        // Initialize the InterestBearingConfig extension
+        // This instruction must come before the instruction to initialize the mint data
+        interest_bearing_mint_initialize(
+            CpiContext::new(
+                ctx.accounts.token_program.to_account_info(),
+                InterestBearingMintInitialize {
+                    token_program_id: ctx.accounts.token_program.to_account_info(),
+                    mint: ctx.accounts.mint_account.to_account_info(),
+                },
+            ),
+            Some(ctx.accounts.payer.key()),
+            rate,
+        )?;
+
+        // Initialize the standard mint account data
+        initialize_mint2(
+            CpiContext::new(
+                ctx.accounts.token_program.to_account_info(),
+                InitializeMint2 {
+                    mint: ctx.accounts.mint_account.to_account_info(),
+                },
+            ),
+            2,                               // decimals
+            &ctx.accounts.payer.key(),       // mint authority
+            Some(&ctx.accounts.payer.key()), // freeze authority
+        )?;
+
+        check_mint_data(
+            &ctx.accounts.mint_account.to_account_info(),
+            &ctx.accounts.payer.key(),
+        )?;
+        Ok(())
+    }
+
+    pub fn update_rate(ctx: Context<UpdateRate>, rate: i16) -> Result<()> {
+        interest_bearing_mint_update_rate(
+            CpiContext::new(
+                ctx.accounts.token_program.to_account_info(),
+                InterestBearingMintUpdateRate {
+                    token_program_id: ctx.accounts.token_program.to_account_info(),
+                    mint: ctx.accounts.mint_account.to_account_info(),
+                    rate_authority: ctx.accounts.authority.to_account_info(),
+                },
+            ),
+            rate,
+        )?;
+
+        check_mint_data(
+            &ctx.accounts.mint_account.to_account_info(),
+            &ctx.accounts.authority.key(),
+        )?;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Initialize<'info> {
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    #[account(mut)]
+    pub mint_account: Signer<'info>,
+
+    pub token_program: Program<'info, Token2022>,
+    pub system_program: Program<'info, System>,
+}
+
+#[derive(Accounts)]
+pub struct UpdateRate<'info> {
+    #[account(mut)]
+    pub authority: Signer<'info>,
+    #[account(mut)]
+    pub mint_account: InterfaceAccount<'info, Mint>,
+
+    pub token_program: Program<'info, Token2022>,
+    pub system_program: Program<'info, System>,
+}
+
+fn check_mint_data(mint_account_info: &AccountInfo, authority_key: &Pubkey) -> Result<()> {
+    let mint_data = mint_account_info.data.borrow();
+    let mint_with_extension = StateWithExtensions::<MintState>::unpack(&mint_data)?;
+    let extension_data = mint_with_extension.get_extension::<InterestBearingConfig>()?;
+
+    assert_eq!(
+        extension_data.rate_authority,
+        OptionalNonZeroPubkey::try_from(Some(*authority_key))?
+    );
+
+    msg!("{:?}", extension_data);
+    Ok(())
+}

tokens/token-2022/interest-bearing/anchor/tests/interest-bearing.ts

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+import * as anchor from "@coral-xyz/anchor";
+import { Program } from "@coral-xyz/anchor";
+import { InterestBearing } from "../target/types/interest_bearing";
+import { TOKEN_2022_PROGRAM_ID, amountToUiAmount } from "@solana/spl-token";
+
+describe("interest-bearing", () => {
+  // Configure the client to use the local cluster.
+  const provider = anchor.AnchorProvider.env();
+  const connection = provider.connection;
+  const wallet = provider.wallet as anchor.Wallet;
+  anchor.setProvider(provider);
+
+  const program = anchor.workspace.InterestBearing as Program<InterestBearing>;
+
+  const mintKeypair = new anchor.web3.Keypair();
+
+  it("Create Mint with InterestBearingConfig extension", async () => {
+    const rate = 0;
+
+    const transactionSignature = await program.methods
+      .initialize(rate)
+      .accounts({ mintAccount: mintKeypair.publicKey })
+      .signers([mintKeypair])
+      .rpc({ skipPreflight: true });
+    console.log("Your transaction signature", transactionSignature);
+  });
+
+  it("Update Mint with Interest Rate", async () => {
+    const rate = 100;
+
+    const transactionSignature = await program.methods
+      .updateRate(rate)
+      .accounts({ mintAccount: mintKeypair.publicKey })
+      .rpc({ skipPreflight: true });
+    console.log("Your transaction signature", transactionSignature);
+  });
+
+  it("Calculate accrued interest", async () => {
+    await sleep(1);
+
+    const amount = 1000;
+    // Convert amount to UI amount with accrued interest
+    // This helper is a simulated transaction
+    const uiAmount = await amountToUiAmount(
+      connection,
+      wallet.payer,
+      mintKeypair.publicKey, // Address of the Mint account
+      amount, // Amount to be converted
+      TOKEN_2022_PROGRAM_ID // Token Extension Program ID
+    );
+
+    console.log("\nAmount with Accrued Interest:", uiAmount);
+  });
+});
+
+function sleep(s: number) {
+  return new Promise((resolve) => setTimeout(resolve, s * 1000));
+}

tokens/token-2022/interest-bearing/anchor/tsconfig.json

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+{
+  "compilerOptions": {
+    "types": ["mocha", "chai"],
+    "typeRoots": ["./node_modules/@types"],
+    "lib": ["es2015"],
+    "module": "commonjs",
+    "target": "es6",
+    "esModuleInterop": true
+  }
+}