add basics/pda-rent-payer/steel (#293)

Author: Nitish-bot

basics/pda-rent-payer/steel/.gitignore

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+target
+test-ledger
+node_modules

basics/pda-rent-payer/steel/Cargo.toml

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+[workspace]
+resolver = "2"
+members = ["api", "program"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "Apache-2.0"
+homepage = ""
+documentation = ""
+repository = ""
+readme = "./README.md"
+keywords = ["solana"]
+
+[workspace.dependencies]
+pda-rent-payer-api = { path = "./api", version = "0.1.0" }
+borsh = "1.5"
+bytemuck = "1.14"
+num_enum = "0.7"
+solana-program = "1.18"
+steel = "2.1"
+thiserror = "1.0"

basics/pda-rent-payer/steel/README.md

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+# PDA Rent Payer
+
+**PDA Rent Payer** is a program that uses a PDA to pay the rent
+for the creation of a system program by simply transferring lamports to it
+        
+## API
+- [`Consts`](api/src/consts.rs) – Program constants.
+- [`Error`](api/src/error.rs) – Custom program errors.
+- [`Instruction`](api/src/instruction.rs) – Declared instructions.
+
+## Instructions
+- [`Add`](program/src/add.rs) – Add ...
+- [`Initialize`](program/src/initialize.rs) – Initialize ...
+
+## State
+- [`Counter`](api/src/state/counter.rs) – Counter ...
+
+## Get started
+
+Compile your program:
+```sh
+steel build
+```
+
+Run unit and integration tests:
+```sh
+steel test
+```

basics/pda-rent-payer/steel/api/Cargo.toml

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+[package]
+name = "pda-rent-payer-api"
+description = "API for interacting with the PDA rent payer program"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+repository.workspace = true
+readme.workspace = true
+keywords.workspace = true
+
+[dependencies]
+borsh.workspace = true
+bytemuck.workspace = true
+num_enum.workspace = true
+solana-program.workspace = true
+steel.workspace = true
+thiserror.workspace = true

basics/pda-rent-payer/steel/api/src/consts.rs

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+// Seed of the rent vault account PDA.
+pub const RENT_VAULT: &[u8] = b"rent_vault";
+
+// Seed of the account PDA to be created.
+// pub const NEW_ACCOUNT: &[u8] = b"new_account";

basics/pda-rent-payer/steel/api/src/error.rs

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+use steel::*;
+
+#[derive(Debug, Error, Clone, Copy, PartialEq, Eq, IntoPrimitive)]
+#[repr(u32)]
+pub enum PdaRentPayerError {
+    #[error("Rent vault account already initialized")]
+    RentVaultInitialized = 0,
+}
+
+error!(PdaRentPayerError);

basics/pda-rent-payer/steel/api/src/instruction.rs

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+use borsh::{BorshDeserialize, BorshSerialize};
+use steel::*;
+
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, TryFromPrimitive)]
+pub enum PdaRentPayerInstruction {
+    InitializeRentVault = 0,
+    CreateNewAccount = 1,
+}
+
+#[repr(C)]
+#[derive(BorshSerialize, BorshDeserialize, Clone, Copy, Debug, Pod, Zeroable)]
+pub struct InitializeRentVault {
+    pub amount: u64,
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Pod, Zeroable)]
+pub struct CreateNewAccount {}
+
+instruction!(PdaRentPayerInstruction, InitializeRentVault);
+instruction!(PdaRentPayerInstruction, CreateNewAccount);

basics/pda-rent-payer/steel/api/src/lib.rs

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+pub mod consts;
+pub mod error;
+pub mod instruction;
+pub mod sdk;
+pub mod state;
+
+pub mod prelude {
+    pub use crate::consts::*;
+    pub use crate::error::*;
+    pub use crate::instruction::*;
+    pub use crate::sdk::*;
+    pub use crate::state::*;
+}
+
+use steel::*;
+
+// TODO Set program id
+declare_id!("HK5TuboXztZv7anSa3GptyCZ5wMYiqbY8kNSVEtqWDuD");

basics/pda-rent-payer/steel/api/src/sdk.rs

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+use steel::*;
+
+use crate::prelude::*;
+
+pub fn init_rent_vault(signer_info: Pubkey, system_program: Pubkey, amount: u64) -> Instruction {
+    Instruction {
+        program_id: crate::ID,
+        accounts: vec![
+            AccountMeta::new(signer_info, true),
+            AccountMeta::new(rent_vault_pda().0, false),
+            AccountMeta::new_readonly(system_program, false),
+        ],
+        data: InitializeRentVault { amount }.to_bytes(),
+    }
+}
+
+pub fn create_new_account(rent_vault: Pubkey, new_account: Pubkey) -> Instruction {
+    Instruction {
+        program_id: crate::ID,
+        accounts: vec![
+            AccountMeta::new(rent_vault, false),
+            AccountMeta::new(new_account, true),
+        ],
+        data: CreateNewAccount {}.to_bytes(),
+    }
+}

basics/pda-rent-payer/steel/api/src/state/accounts.rs

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+use super::PdaRentPayerAccountDiscriminator;
+use steel::*;
+
+/// This empty struct represents the payer vault account
+#[repr(C)]
+#[derive(Clone, Copy, Debug, PartialEq, Pod, Zeroable)]
+pub struct RentVault {}
+
+/// This empty struct represents the account
+/// that the vault will pay for
+#[repr(C)]
+#[derive(Clone, Copy, Debug, PartialEq, Pod, Zeroable)]
+pub struct NewAccount {}
+
+account!(PdaRentPayerAccountDiscriminator, RentVault);
+account!(PdaRentPayerAccountDiscriminator, NewAccount);