shank_macro

Provides macros used to annotate Solana Rust programs in order to extract an IDL with the shank CLI.

ShankAccount

Annotates a struct that shank will consider an account containing de/serializable data.

use shank::ShankAccount;
use borsh::{BorshDeserialize, BorshSerialize};

#[derive(Clone, BorshSerialize, BorshDeserialize, ShankAccount)]
pub struct Metadata {
    pub update_authority: Pubkey,
    pub mint: Pubkey,
    pub primary_sale_happened: bool,
}

Field Attributes

#[idl_type(...)] attribute

This attribute allows you to override how Shank interprets a field's type when generating the IDL. This is useful for:

1. Fields with wrapper types that should be treated as their inner types in the IDL
2. Fields storing enum values as primitives (like u8) that should be recognized as enums
3. Fields with complex types that need simpler representations in the IDL

The attribute supports two formats:

1. String literal format: #idl_type("TypeName")]
2. Direct type format: #[idl_type(TypeName)]

The difference between these is that the direct type format will error at runtime if the referenced type cannot be found in the Rust type system. In the future, ideally the direct type format would perform checks on the given type.

use shank::ShankAccount;
use borsh::{BorshDeserialize, BorshSerialize};

#[derive(Clone, BorshSerialize, BorshDeserialize, ShankAccount)]
pub struct MyAccount {
    // Regular field
    pub regular_field: u32,

    // Field stored as u8 but representing an enum (string literal format)
    #[idl_type("MyEnum")]
    pub enum_as_byte_str: u8,

    // Field with a wrapper type that should be treated as a simpler type (string literal format)
    #[idl_type("u64")]
    pub wrapped_u64_str: CustomU64Wrapper,

    // Field stored as u8 but representing an enum (direct type format)
    #[idl_type(MyEnum)]
    pub enum_as_byte_direct: u8,

    // Field with a wrapper type that should be treated as a simpler type (direct type format)
    #[idl_type(u32)]
    pub wrapped_u32_direct: CustomU32Wrapper,
}

The type specified must be a valid Rust type that Shank can recognize. If the type is a custom type (like an enum), make sure it's defined in your codebase and is accessible to Shank during IDL generation (for example, via the ShankType trait).

#[padding] attribute

Indicates that a field is used for padding and should be marked as such in the IDL.

#[idl_name("name")] attribute

Allows you to override the field name that appears in the IDL while keeping the original Rust field name. This is useful when you need different naming conventions between your Rust code and the generated IDL.

use shank::ShankAccount;
use borsh::{BorshDeserialize, BorshSerialize};

#[derive(Clone, BorshSerialize, BorshDeserialize, ShankAccount)]
pub struct MyAccount {
    // This field will appear as "displayName" in the IDL
    #[idl_name("displayName")]
    pub internal_name: String,
    
    // This field will appear as "userCount" in the IDL
    #[idl_name("userCount")]
    pub total_users: u32,
}

#[skip] attribute

Excludes the field from the IDL entirely. The field will not appear in the generated IDL. This is useful for internal-only fields that shouldn't be exposed in the interface definition.

use shank::ShankAccount;
use borsh::{BorshDeserialize, BorshSerialize};

#[derive(Clone, BorshSerialize, BorshDeserialize, ShankAccount)]
pub struct MyAccount {
    // This field will appear in the IDL
    pub public_field: u64,
    
    // This field will be excluded from the IDL
    #[skip]
    pub internal_only_field: String,
    
    // This field will also be excluded from the IDL
    #[skip]
    pub debug_info: Vec<u8>,
}

Combining Attributes

You can combine multiple field attributes on the same field:

use shank::ShankAccount;
use borsh::{BorshDeserialize, BorshSerialize};

#[derive(Clone, BorshSerialize, BorshDeserialize, ShankAccount)]
pub struct MyAccount {
    // Rename the field and override its type
    #[idl_name("customField")]
    #[idl_type("CustomType")]
    pub internal_field: SomeWrapper<CustomType>,
    
    // Mark as padding and rename
    #[padding]
    #[idl_name("alignmentPadding")]
    pub _padding: [u8; 8],
}

### Note

The fields of a _ShankAccount_ struct can reference other types as long as they are annotated
with `BorshSerialize`, `BorshDeserialize`, or `ShankType`.

## ShankInstruction

Annotates the program _Instruction_ `Enum` in order to include `#[account]` attributes.

The `#[account]` attributes indicate for each instruction _variant_ which accounts it expects
and how they should be configured.

### `#[account]` attribute

This attribute allows you to configure each account that is provided to the particular
instruction. These annotations need to follow the order in which the accounts are provided.
They take the following general form:

```rs
#[account(index?, (writable|signer)?, name="<account_name>", desc?="optional description")]

• index: optionally provides the account index in the provided accounts array which needs to match its position of #[account] attributes
• signer | sign | sig: indicates that the account is signer
• writable | write | writ | mut: indicates that the account is writable which means it may be mutated as part of processing the particular instruction
• name: (required) provides the name for the account
• desc | description: allows to provide a description of the account

Known Accounts

If an account name matches either of the a known accounts indicated below then solita generated SDK code won't require providing it as the program id is known.

• token_program uses TOKEN_PROGRAM_ID
• ata_program uses ASSOCIATED_TOKEN_PROGRAM_ID
• system_program uses SystemProgram.programId
• rent uses SYSVAR_RENT_PUBKEY

use borsh::{BorshDeserialize, BorshSerialize};
use shank::ShankInstruction;
#[derive(Debug, Clone, ShankInstruction, BorshSerialize, BorshDeserialize)]
#[rustfmt::skip]
pub enum VaultInstruction {
    /// Initialize a token vault, starts inactivate. Add tokens in subsequent instructions, then activate.
    #[account(0, writable, name="fraction_mint",
              desc="Initialized fractional share mint with 0 tokens in supply, authority on mint must be pda of program with seed [prefix, programid]")]
    #[account(1, writable, name="redeem_treasury",
            desc = "Initialized redeem treasury token account with 0 tokens in supply, owner of account must be pda of program like above")]
    #[account(2, writable, name="fraction_treasury",
            desc = "Initialized fraction treasury token account with 0 tokens in supply, owner of account must be pda of program like above")]
    #[account(3, writable, name="vault",
            desc = "Uninitialized vault account")]
    #[account(4, name="authority",
            desc = "Authority on the vault")]
    #[account(5, name="pricing_lookup_address",
            desc = "Pricing Lookup Address")]
    #[account(6, name="token_program",
            desc = "Token program")]
    #[account(7, name="rent",
            desc = "Rent sysvar")]
    InitVault(InitVaultArgs),

    /// Activates the vault, distributing initial shares into the fraction treasury.
    /// Tokens can no longer be removed in this state until Combination.
    #[account(0, writable, name="vault", desc = "Initialized inactivated fractionalized token vault")]
    #[account(1, writable, name="fraction_mint", desc = "Fraction mint")]
    #[account(2, writable, name="fraction_treasury", desc = "Fraction treasury")]
    #[account(3, name="fraction_mint_authority", desc = "Fraction mint authority for the program - seed of [PREFIX, program_id]")]
    #[account(4, signer, name="vault_authority", desc = "Authority on the vault")]
    #[account(5, name="token_program", desc = "Token program")]
    ActivateVault(NumberOfShareArgs)
}

LICENSE

Apache-2.0