778 lines
28 KiB
Rust
778 lines
28 KiB
Rust
//! The base library for all Solana on-chain Rust programs.
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//!
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//! All Solana Rust programs that run on-chain will link to this crate, which
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//! acts as a standard library for Solana programs. Solana programs also link to
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//! the [Rust standard library][std], though it is [modified][sstd] for the
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//! Solana runtime environment. While off-chain programs that interact with the
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//! Solana network _can_ link to this crate, they typically instead use the
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//! [`solana-sdk`] crate, which reexports all modules from `solana-program`.
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//!
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//! [std]: https://doc.rust-lang.org/stable/std/
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//! [sstd]: https://docs.solana.com/developing/on-chain-programs/developing-rust#restrictions
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//! [`solana-sdk`]: https://docs.rs/solana-sdk/latest/solana_sdk/
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//!
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//! This library defines
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//!
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//! - macros for declaring the [program entrypoint][pe],
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//! - [core data types][cdt],
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//! - [logging] macros,
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//! - [serialization] methods,
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//! - methods for [cross-program instruction execution][cpi],
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//! - program IDs and instruction constructors for the system program and other
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//! [native programs][np],
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//! - [sysvar] accessors.
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//!
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//! [pe]: #defining-a-solana-program
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//! [cdt]: #core-data-types
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//! [logging]: crate::log
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//! [serialization]: #serialization
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//! [np]: #native-programs
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//! [cpi]: #cross-program-instruction-execution
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//! [sysvar]: crate::sysvar
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//!
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//! Idiomatic examples of `solana-program` usage can be found in
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//! [the Solana Program Library][spl].
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//!
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//! [spl]: https://github.com/solana-labs/solana-program-library
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//!
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//! # Defining a solana program
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//!
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//! Solana program crates have some unique properties compared to typical Rust
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//! programs:
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//!
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//! - They are often compiled for both on-chain use and off-chain use. This is
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//! primarily because off-chain clients may need access to data types
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//! defined by the on-chain program.
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//! - They do not define a `main` function, but instead define their entrypoint
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//! with the [`entrypoint!`] macro.
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//! - They are compiled as the ["cdylib"] crate type for dynamic loading
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//! by the Solana runtime.
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//! - They run in a constrained VM environment, and while they do have access to
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//! the [Rust standard library][std], many features of the standard library,
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//! particularly related to OS services, will fail at runtime, will silently
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//! do nothing, or are not defined. See the [restrictions to the Rust standard
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//! library][sstd] in the Solana documentation for more.
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//!
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//! [std]: https://doc.rust-lang.org/std/index.html
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//! ["cdylib"]: https://doc.rust-lang.org/reference/linkage.html
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//!
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//! Because multiple crates that are linked together cannot all define
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//! program entrypoints (see the [`entrypoint!`] documentation) a common
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//! convention is to use a [Cargo feature] called `no-entrypoint` to allow
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//! the program entrypoint to be disabled.
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//!
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//! [Cargo feature]: https://doc.rust-lang.org/cargo/reference/features.html
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//!
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//! The skeleton of a Solana program typically looks like:
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//!
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//! ```
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//! #[cfg(not(feature = "no-entrypoint"))]
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//! pub mod entrypoint {
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//! use solana_program::{
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//! account_info::AccountInfo,
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//! entrypoint,
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//! entrypoint::ProgramResult,
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//! pubkey::Pubkey,
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//! };
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//!
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//! entrypoint!(process_instruction);
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//!
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//! pub fn process_instruction(
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//! program_id: &Pubkey,
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//! accounts: &[AccountInfo],
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//! instruction_data: &[u8],
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//! ) -> ProgramResult {
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//! // Decode and dispatch instructions here.
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//! todo!()
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//! }
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//! }
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//!
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//! // Additional code goes here.
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//! ```
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//!
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//! With a `Cargo.toml` file that contains
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//!
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//! ```toml
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//! [lib]
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//! crate-type = ["cdylib", "rlib"]
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//!
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//! [features]
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//! no-entrypoint = []
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//! ```
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//!
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//! Note that a Solana program must specify its crate-type as "cdylib", and
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//! "cdylib" crates will automatically be discovered and built by the `cargo
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//! build-bpf` command. Solana programs also often have crate-type "rlib" so
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//! they can be linked to other Rust crates.
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//!
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//! # On-chain vs. off-chain compilation targets
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//!
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//! Solana programs run on the [rbpf] VM, which implements a variant of the
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//! [eBPF] instruction set. Because this crate can be compiled for both on-chain
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//! and off-chain execution, the environments of which are significantly
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//! different, it extensively uses [conditional compilation][cc] to tailor its
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//! implementation to the environment. The `cfg` predicate used for identifying
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//! compilation for on-chain programs is `target_os = "solana"`, as in this
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//! example from the `solana-program` codebase that logs a message via a
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//! syscall when run on-chain, and via a library call when offchain:
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//!
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//! [rbpf]: https://github.com/solana-labs/rbpf
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//! [eBPF]: https://ebpf.io/
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//! [cc]: https://doc.rust-lang.org/reference/conditional-compilation.html
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//!
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//! ```
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//! pub fn sol_log(message: &str) {
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//! #[cfg(target_os = "solana")]
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//! unsafe {
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//! sol_log_(message.as_ptr(), message.len() as u64);
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//! }
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//!
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//! #[cfg(not(target_os = "solana"))]
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//! program_stubs::sol_log(message);
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//! }
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//! # mod program_stubs {
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//! # pub(crate) fn sol_log(message: &str) { }
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//! # }
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//! ```
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//!
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//! This `cfg` pattern is suitable as well for user code that needs to work both
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//! on-chain and off-chain.
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//!
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//! `solana-program` and `solana-sdk` were previously a single crate. Because of
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//! this history, and because of the dual-usage of `solana-program` for two
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//! different environments, it contains some features that are not available to
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//! on-chain programs at compile-time. It also contains some on-chain features
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//! that will fail in off-chain scenarios at runtime. This distinction is not
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//! well-reflected in the documentation.
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//!
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//! For a more complete description of Solana's implementation of eBPF and its
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//! limitations, see the main Solana documentation for [on-chain programs][ocp].
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//!
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//! [ocp]: https://docs.solana.com/developing/on-chain-programs/overview
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//!
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//! # Core data types
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//!
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//! - [`Pubkey`] — The address of a [Solana account][acc]. Some account
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//! addresses are [ed25519] public keys, with corresponding secret keys that
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//! are managed off-chain. Often, though, account addresses do not have
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//! corresponding secret keys — as with [_program derived
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//! addresses_][pdas] — or the secret key is not relevant to the
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//! operation of a program, and may have even been disposed of. As running
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//! Solana programs can not safely create or manage secret keys, the full
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//! [`Keypair`] is not defined in `solana-program` but in `solana-sdk`.
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//! - [`Hash`] — A cryptographic hash. Used to uniquely identify blocks,
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//! and also for general purpose hashing.
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//! - [`AccountInfo`] — A description of a single Solana account. All accounts
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//! that might be accessed by a program invocation are provided to the program
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//! entrypoint as `AccountInfo`.
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//! - [`Instruction`] — A directive telling the runtime to execute a program,
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//! passing it a set of accounts and program-specific data.
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//! - [`ProgramError`] and [`ProgramResult`] — The error type that all programs
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//! must return, reported to the runtime as a `u64`.
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//! - [`Sol`] — The Solana native token type, with conversions to and from
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//! [_lamports_], the smallest fractional unit of SOL, in the [`native_token`]
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//! module.
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//!
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//! [acc]: https://docs.solana.com/developing/programming-model/accounts
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//! [`Pubkey`]: pubkey::Pubkey
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//! [`Hash`]: hash::Hash
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//! [`Instruction`]: instruction::Instruction
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//! [`AccountInfo`]: account_info::AccountInfo
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//! [`ProgramError`]: program_error::ProgramError
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//! [`ProgramResult`]: entrypoint::ProgramResult
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//! [ed25519]: https://ed25519.cr.yp.to/
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//! [`Keypair`]: https://docs.rs/solana-sdk/latest/solana_sdk/signer/keypair/struct.Keypair.html
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//! [SHA-256]: https://en.wikipedia.org/wiki/SHA-2
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//! [`Sol`]: native_token::Sol
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//! [_lamports_]: https://docs.solana.com/introduction#what-are-sols
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//!
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//! # Serialization
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//!
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//! Within the Solana runtime, programs, and network, at least three different
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//! serialization formats are used, and `solana-program` provides access to
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//! those needed by programs.
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//!
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//! In user-written Solana program code, serialization is primarily used for
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//! accessing [`AccountInfo`] data and [`Instruction`] data, both of which are
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//! program-specific binary data. Every program is free to decide their own
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//! serialization format, but data received from other sources —
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//! [sysvars][sysvar] for example — must be deserialized using the methods
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//! indicated by the documentation for that data or data type.
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//!
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//! [`AccountInfo`]: account_info::AccountInfo
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//! [`Instruction`]: instruction::Instruction
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//!
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//! The three serialization formats in use in Solana are:
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//!
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//! - __[Borsh]__, a compact and well-specified format developed by the [NEAR]
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//! project, suitable for use in protocol definitions and for archival storage.
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//! It has a [Rust implementation][brust] and a [JavaScript implementation][bjs]
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//! and is recommended for all purposes.
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//!
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//! Users need to import the [`borsh`] crate themselves — it is not
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//! re-exported by `solana-program`, though this crate provides several useful
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//! utilities in its [`borsh` module][borshmod] that are not available in the
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//! `borsh` library.
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//!
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//! The [`Instruction::new_with_borsh`] function creates an `Instruction` by
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//! serializing a value with borsh.
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//!
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//! [Borsh]: https://borsh.io/
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//! [NEAR]: https://near.org/
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//! [brust]: https://docs.rs/borsh
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//! [bjs]: https://github.com/near/borsh-js
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//! [`borsh`]: https://docs.rs/borsh
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//! [borshmod]: crate::borsh
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//! [`Instruction::new_with_borsh`]: instruction::Instruction::new_with_borsh
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//!
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//! - __[Bincode]__, a compact serialization format that implements the [Serde]
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//! Rust APIs. As it does not have a specification nor a JavaScript
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//! implementation, and uses more CPU than borsh, it is not recommend for new
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//! code.
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//!
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//! Many system program and native program instructions are serialized with
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//! bincode, and it is used for other purposes in the runtime. In these cases
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//! Rust programmers are generally not directly exposed to the encoding format
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//! as it is hidden behind APIs.
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//!
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//! The [`Instruction::new_with_bincode`] function creates an `Instruction` by
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//! serializing a value with bincode.
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//!
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//! [Bincode]: https://docs.rs/bincode
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//! [Serde]: https://serde.rs/
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//! [`Instruction::new_with_bincode`]: instruction::Instruction::new_with_bincode
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//!
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//! - __[`Pack`]__, a Solana-specific serialization API that is used by many
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//! older programs in the [Solana Program Library][spl] to define their
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//! account format. It is difficult to implement and does not define a
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//! language-independent serialization format. It is not generally recommended
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//! for new code.
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//!
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//! [`Pack`]: program_pack::Pack
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//!
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//! Developers should carefully consider the CPU cost of serialization, balanced
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//! against the need for correctness and ease of use: off-the-shelf
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//! serialization formats tend to be more expensive than carefully hand-written
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//! application-specific formats; but application-specific formats are more
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//! difficult to ensure the correctness of, and to provide multi-language
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//! implementations for. It is not uncommon for programs to pack and unpack
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//! their data with hand-written code.
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//!
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//! # Cross-program instruction execution
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//!
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//! Solana programs may call other programs, termed [_cross-program
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//! invocation_][cpi] (CPI), with the [`invoke`] and [`invoke_signed`]
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//! functions. When calling another program the caller must provide the
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//! [`Instruction`] to be invoked, as well as the [`AccountInfo`] for every
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//! account required by the instruction. Because the only way for a program to
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//! acquire `AccountInfo` values is by receiving them from the runtime at the
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//! [program entrypoint][entrypoint!], any account required by the callee
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//! program must transitively be required by the caller program, and provided by
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//! _its_ caller.
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//!
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//! [`invoke`]: program::invoke
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//! [`invoke_signed`]: program::invoke_signed
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//! [cpi]: https://docs.solana.com/developing/programming-model/calling-between-programs
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//!
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//! A simple example of transferring lamports via CPI:
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//!
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//! ```
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//! use solana_program::{
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//! account_info::{next_account_info, AccountInfo},
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//! entrypoint,
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//! entrypoint::ProgramResult,
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//! program::invoke,
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//! pubkey::Pubkey,
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//! system_instruction,
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//! system_program,
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//! };
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//!
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//! entrypoint!(process_instruction);
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//!
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//! fn process_instruction(
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//! program_id: &Pubkey,
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//! accounts: &[AccountInfo],
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//! instruction_data: &[u8],
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//! ) -> ProgramResult {
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//! let account_info_iter = &mut accounts.iter();
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//!
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//! let payer = next_account_info(account_info_iter)?;
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//! let recipient = next_account_info(account_info_iter)?;
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//!
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//! assert!(payer.is_writable);
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//! assert!(payer.is_signer);
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//! assert!(recipient.is_writable);
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//!
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//! let lamports = 1000000;
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//!
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//! invoke(
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//! &system_instruction::transfer(payer.key, recipient.key, lamports),
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//! &[payer.clone(), recipient.clone()],
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//! )
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//! }
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//! ```
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//!
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//! Solana also includes a mechanism to let programs control and sign for
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//! accounts without needing to protect a corresponding secret key, called
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//! [_program derived addresses_][pdas]. PDAs are derived with the
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//! [`Pubkey::find_program_address`] function. With a PDA, a program can call
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//! `invoke_signed` to call another program while virtually "signing" for the
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//! PDA.
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//!
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//! [pdas]: https://docs.solana.com/developing/programming-model/calling-between-programs#program-derived-addresses
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//! [`Pubkey::find_program_address`]: pubkey::Pubkey::find_program_address
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//!
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//! A simple example of creating an account for a PDA:
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//!
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//! ```
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//! use solana_program::{
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//! account_info::{next_account_info, AccountInfo},
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//! entrypoint,
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//! entrypoint::ProgramResult,
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//! program::invoke_signed,
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//! pubkey::Pubkey,
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//! system_instruction,
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//! system_program,
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//! };
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//!
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//! entrypoint!(process_instruction);
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//!
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//! fn process_instruction(
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//! program_id: &Pubkey,
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//! accounts: &[AccountInfo],
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//! instruction_data: &[u8],
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//! ) -> ProgramResult {
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//! let account_info_iter = &mut accounts.iter();
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//! let payer = next_account_info(account_info_iter)?;
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//! let vault_pda = next_account_info(account_info_iter)?;
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//! let system_program = next_account_info(account_info_iter)?;
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//!
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//! assert!(payer.is_writable);
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//! assert!(payer.is_signer);
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//! assert!(vault_pda.is_writable);
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//! assert_eq!(vault_pda.owner, &system_program::ID);
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//! assert!(system_program::check_id(system_program.key));
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//!
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//! let vault_bump_seed = instruction_data[0];
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//! let vault_seeds = &[b"vault", payer.key.as_ref(), &[vault_bump_seed]];
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//! let expected_vault_pda = Pubkey::create_program_address(vault_seeds, program_id)?;
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//!
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//! assert_eq!(vault_pda.key, &expected_vault_pda);
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//!
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//! let lamports = 10000000;
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//! let vault_size = 16;
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//!
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//! invoke_signed(
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//! &system_instruction::create_account(
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//! &payer.key,
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//! &vault_pda.key,
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//! lamports,
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//! vault_size,
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//! &program_id,
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//! ),
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//! &[
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//! payer.clone(),
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//! vault_pda.clone(),
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//! ],
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//! &[
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//! &[
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//! b"vault",
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//! payer.key.as_ref(),
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//! &[vault_bump_seed],
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//! ],
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//! ]
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//! )?;
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//! Ok(())
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//! }
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//! ```
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//!
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//! # Native programs
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//!
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//! Some solana programs are [_native programs_][np2], running native machine
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//! code that is distributed with the runtime, with well-known program IDs.
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//!
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//! [np2]: https://docs.solana.com/developing/runtime-facilities/programs
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//!
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//! Some native programs can be [invoked][cpi] by other programs, but some can
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//! only be executed as "top-level" instructions included by off-chain clients
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//! in a [`Transaction`].
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//!
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//! [`Transaction`]: https://docs.rs/solana-sdk/latest/solana_sdk/transaction/struct.Transaction.html
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//!
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//! This crate defines the program IDs for most native programs. Even though
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//! some native programs cannot be invoked by other programs, a Solana program
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//! may need access to their program IDs. For example, a program may need to
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//! verify that an ed25519 signature verification instruction was included in
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//! the same transaction as its own instruction. For many native programs, this
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//! crate also defines enums that represent the instructions they process, and
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//! constructors for building the instructions.
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//!
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//! Locations of program IDs and instruction constructors are noted in the list
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//! below, as well as whether they are invokable by other programs.
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//!
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//! While some native programs have been active since the genesis block, others
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//! are activated dynamically after a specific [slot], and some are not yet
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//! active. This documentation does not distinguish which native programs are
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//! active on any particular network. The `solana feature status` CLI command
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//! can help in determining active features.
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//!
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//! [slot]: https://docs.solana.com/terminology#slot
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//!
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//! Native programs important to Solana program authors include:
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//!
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//! - __System Program__: Creates new accounts, allocates account data, assigns
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//! accounts to owning programs, transfers lamports from System Program owned
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//! accounts and pays transaction fees.
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//! - ID: [`solana_program::system_program`]
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//! - Instruction: [`solana_program::system_instruction`]
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//! - Invokable by programs? yes
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//!
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//! - __Compute Budget Program__: Requests additional CPU or memory resources
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//! for a transaction. This program does nothing when called from another
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//! program.
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//! - ID: [`solana_sdk::compute_budget`](https://docs.rs/solana-sdk/latest/solana_sdk/compute_budget/index.html)
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//! - Instruction: [`solana_sdk::compute_budget`](https://docs.rs/solana-sdk/latest/solana_sdk/compute_budget/index.html)
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//! - Invokable by programs? no
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//!
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//! - __ed25519 Program__: Verifies an ed25519 signature.
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//! - ID: [`solana_program::ed25519_program`]
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//! - Instruction: [`solana_sdk::ed25519_instruction`](https://docs.rs/solana-sdk/latest/solana_sdk/ed25519_instruction/index.html)
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//! - Invokable by programs? no
|
|
//!
|
|
//! - __secp256k1 Program__: Verifies secp256k1 public key recovery operations.
|
|
//! - ID: [`solana_program::secp256k1_program`]
|
|
//! - Instruction: [`solana_sdk::secp256k1_instruction`](https://docs.rs/solana-sdk/latest/solana_sdk/secp256k1_instruction/index.html)
|
|
//! - Invokable by programs? no
|
|
//!
|
|
//! - __BPF Loader__: Deploys, and executes immutable programs on the chain.
|
|
//! - ID: [`solana_program::bpf_loader`]
|
|
//! - Instruction: [`solana_program::loader_instruction`]
|
|
//! - Invokable by programs? yes
|
|
//!
|
|
//! - __Upgradable BPF Loader__: Deploys, upgrades, and executes upgradable
|
|
//! programs on the chain.
|
|
//! - ID: [`solana_program::bpf_loader_upgradeable`]
|
|
//! - Instruction: [`solana_program::loader_upgradeable_instruction`]
|
|
//! - Invokable by programs? yes
|
|
//!
|
|
//! - __Deprecated BPF Loader__: Deploys, and executes immutable programs on the
|
|
//! chain.
|
|
//! - ID: [`solana_program::bpf_loader_deprecated`]
|
|
//! - Instruction: [`solana_program::loader_instruction`]
|
|
//! - Invokable by programs? yes
|
|
//!
|
|
//! [lut]: https://docs.solana.com/proposals/versioned-transactions
|
|
|
|
#![allow(incomplete_features)]
|
|
#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
|
|
#![cfg_attr(RUSTC_NEEDS_PROC_MACRO_HYGIENE, feature(proc_macro_hygiene))]
|
|
|
|
// Allows macro expansion of `use ::solana_program::*` to work within this crate
|
|
extern crate self as solana_program;
|
|
|
|
pub mod account_info;
|
|
pub mod address_lookup_table_account;
|
|
pub mod alt_bn128;
|
|
pub(crate) mod atomic_u64;
|
|
pub mod big_mod_exp;
|
|
pub mod blake3;
|
|
pub mod borsh;
|
|
pub mod borsh0_10;
|
|
pub mod borsh0_9;
|
|
pub mod bpf_loader;
|
|
pub mod bpf_loader_deprecated;
|
|
pub mod bpf_loader_upgradeable;
|
|
pub mod clock;
|
|
pub mod debug_account_data;
|
|
pub mod decode_error;
|
|
pub mod ed25519_program;
|
|
pub mod entrypoint;
|
|
pub mod entrypoint_deprecated;
|
|
pub mod epoch_rewards;
|
|
pub mod epoch_schedule;
|
|
pub mod feature;
|
|
pub mod fee_calculator;
|
|
pub mod hash;
|
|
pub mod incinerator;
|
|
pub mod instruction;
|
|
pub mod keccak;
|
|
pub mod lamports;
|
|
pub mod last_restart_slot;
|
|
pub mod loader_instruction;
|
|
pub mod loader_upgradeable_instruction;
|
|
pub mod loader_v4;
|
|
pub mod loader_v4_instruction;
|
|
pub mod log;
|
|
pub mod message;
|
|
pub mod native_token;
|
|
pub mod nonce;
|
|
pub mod poseidon;
|
|
pub mod program;
|
|
pub mod program_error;
|
|
pub mod program_memory;
|
|
pub mod program_option;
|
|
pub mod program_pack;
|
|
pub mod program_stubs;
|
|
pub mod program_utils;
|
|
pub mod pubkey;
|
|
pub mod rent;
|
|
pub mod sanitize;
|
|
pub mod secp256k1_program;
|
|
pub mod secp256k1_recover;
|
|
pub mod serde_varint;
|
|
pub mod serialize_utils;
|
|
pub mod short_vec;
|
|
pub mod slot_hashes;
|
|
pub mod slot_history;
|
|
pub mod stable_layout;
|
|
pub mod stake;
|
|
pub mod stake_history;
|
|
pub mod syscalls;
|
|
pub mod system_instruction;
|
|
pub mod system_program;
|
|
pub mod sysvar;
|
|
pub mod vote;
|
|
pub mod wasm;
|
|
|
|
#[cfg(target_os = "solana")]
|
|
pub use solana_sdk_macro::wasm_bindgen_stub as wasm_bindgen;
|
|
/// Re-export of [wasm-bindgen].
|
|
///
|
|
/// [wasm-bindgen]: https://rustwasm.github.io/docs/wasm-bindgen/
|
|
#[cfg(not(target_os = "solana"))]
|
|
pub use wasm_bindgen::prelude::wasm_bindgen;
|
|
|
|
/// The [config native program][np].
|
|
///
|
|
/// [np]: https://docs.solana.com/developing/runtime-facilities/programs#config-program
|
|
pub mod config {
|
|
pub mod program {
|
|
crate::declare_id!("Config1111111111111111111111111111111111111");
|
|
}
|
|
}
|
|
|
|
/// A vector of Solana SDK IDs.
|
|
pub mod sdk_ids {
|
|
use {
|
|
crate::{
|
|
bpf_loader, bpf_loader_deprecated, bpf_loader_upgradeable, config, ed25519_program,
|
|
feature, incinerator, secp256k1_program, solana_program::pubkey::Pubkey, stake,
|
|
system_program, sysvar, vote,
|
|
},
|
|
lazy_static::lazy_static,
|
|
};
|
|
|
|
lazy_static! {
|
|
pub static ref SDK_IDS: Vec<Pubkey> = {
|
|
let mut sdk_ids = vec![
|
|
ed25519_program::id(),
|
|
secp256k1_program::id(),
|
|
system_program::id(),
|
|
sysvar::id(),
|
|
bpf_loader::id(),
|
|
bpf_loader_upgradeable::id(),
|
|
incinerator::id(),
|
|
config::program::id(),
|
|
vote::program::id(),
|
|
feature::id(),
|
|
bpf_loader_deprecated::id(),
|
|
#[allow(deprecated)]
|
|
stake::config::id(),
|
|
];
|
|
sdk_ids.extend(sysvar::ALL_IDS.iter());
|
|
sdk_ids
|
|
};
|
|
}
|
|
}
|
|
|
|
/// Same as [`declare_id`] except that it reports that this ID has been deprecated.
|
|
pub use solana_sdk_macro::program_declare_deprecated_id as declare_deprecated_id;
|
|
/// Convenience macro to declare a static public key and functions to interact with it.
|
|
///
|
|
/// Input: a single literal base58 string representation of a program's ID.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```
|
|
/// # // wrapper is used so that the macro invocation occurs in the item position
|
|
/// # // rather than in the statement position which isn't allowed.
|
|
/// use std::str::FromStr;
|
|
/// use solana_program::{declare_id, pubkey::Pubkey};
|
|
///
|
|
/// # mod item_wrapper {
|
|
/// # use solana_program::declare_id;
|
|
/// declare_id!("My11111111111111111111111111111111111111111");
|
|
/// # }
|
|
/// # use item_wrapper::id;
|
|
///
|
|
/// let my_id = Pubkey::from_str("My11111111111111111111111111111111111111111").unwrap();
|
|
/// assert_eq!(id(), my_id);
|
|
/// ```
|
|
pub use solana_sdk_macro::program_declare_id as declare_id;
|
|
/// Convenience macro to define a static public key.
|
|
///
|
|
/// Input: a single literal base58 string representation of a Pubkey.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```
|
|
/// use std::str::FromStr;
|
|
/// use solana_program::{pubkey, pubkey::Pubkey};
|
|
///
|
|
/// static ID: Pubkey = pubkey!("My11111111111111111111111111111111111111111");
|
|
///
|
|
/// let my_id = Pubkey::from_str("My11111111111111111111111111111111111111111").unwrap();
|
|
/// assert_eq!(ID, my_id);
|
|
/// ```
|
|
pub use solana_sdk_macro::program_pubkey as pubkey;
|
|
|
|
#[macro_use]
|
|
extern crate serde_derive;
|
|
|
|
#[macro_use]
|
|
extern crate solana_frozen_abi_macro;
|
|
|
|
/// Convenience macro for doing integer division where the operation's safety
|
|
/// can be checked at compile-time.
|
|
///
|
|
/// Since `unchecked_div_by_const!()` is supposed to fail at compile-time, abuse
|
|
/// doctests to cover failure modes
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// Literal denominator div-by-zero fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// let _ = unchecked_div_by_const!(10, 0);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Const denominator div-by-zero fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// const D: u64 = 0;
|
|
/// let _ = unchecked_div_by_const!(10, D);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Non-const denominator fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// let d = 0;
|
|
/// let _ = unchecked_div_by_const!(10, d);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Literal denominator div-by-zero fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// const N: u64 = 10;
|
|
/// let _ = unchecked_div_by_const!(N, 0);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Const denominator div-by-zero fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// const N: u64 = 10;
|
|
/// const D: u64 = 0;
|
|
/// let _ = unchecked_div_by_const!(N, D);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Non-const denominator fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// # const N: u64 = 10;
|
|
/// let d = 0;
|
|
/// let _ = unchecked_div_by_const!(N, d);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Literal denominator div-by-zero fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// let n = 10;
|
|
/// let _ = unchecked_div_by_const!(n, 0);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Const denominator div-by-zero fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// let n = 10;
|
|
/// const D: u64 = 0;
|
|
/// let _ = unchecked_div_by_const!(n, D);
|
|
/// # }
|
|
/// ```
|
|
///
|
|
/// Non-const denominator fails:
|
|
///
|
|
/// ```compile_fail
|
|
/// # use solana_program::unchecked_div_by_const;
|
|
/// # fn main() {
|
|
/// let n = 10;
|
|
/// let d = 0;
|
|
/// let _ = unchecked_div_by_const!(n, d);
|
|
/// # }
|
|
/// ```
|
|
#[macro_export]
|
|
macro_rules! unchecked_div_by_const {
|
|
($num:expr, $den:expr) => {{
|
|
// Ensure the denominator is compile-time constant
|
|
let _ = [(); ($den - $den) as usize];
|
|
// Compile-time constant integer div-by-zero passes for some reason
|
|
// when invoked from a compilation unit other than that where this
|
|
// macro is defined. Do an explicit zero-check for now. Sorry about the
|
|
// ugly error messages!
|
|
// https://users.rust-lang.org/t/unexpected-behavior-of-compile-time-integer-div-by-zero-check-in-declarative-macro/56718
|
|
let _ = [(); ($den as usize) - 1];
|
|
#[allow(clippy::integer_arithmetic)]
|
|
let quotient = $num / $den;
|
|
quotient
|
|
}};
|
|
}
|
|
|
|
// This module is purposefully listed after all other exports: because of an
|
|
// interaction within rustdoc between the reexports inside this module of
|
|
// `solana_program`'s top-level modules, and `solana_sdk`'s glob re-export of
|
|
// `solana_program`'s top-level modules, if this module is not lexically last
|
|
// rustdoc fails to generate documentation for the re-exports within
|
|
// `solana_sdk`.
|
|
#[cfg(not(target_os = "solana"))]
|
|
pub mod example_mocks;
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::unchecked_div_by_const;
|
|
|
|
#[test]
|
|
fn test_unchecked_div_by_const() {
|
|
const D: u64 = 2;
|
|
const N: u64 = 10;
|
|
let n = 10;
|
|
assert_eq!(unchecked_div_by_const!(10, 2), 5);
|
|
assert_eq!(unchecked_div_by_const!(N, 2), 5);
|
|
assert_eq!(unchecked_div_by_const!(n, 2), 5);
|
|
assert_eq!(unchecked_div_by_const!(10, D), 5);
|
|
assert_eq!(unchecked_div_by_const!(N, D), 5);
|
|
assert_eq!(unchecked_div_by_const!(n, D), 5);
|
|
}
|
|
}
|