Struct SysvarContext 

pub struct SysvarContext { /* private fields */ }

Combined sysvar context for a single instruction.

Parse all needed sysvars once at the top of your instruction handler, then pass this context to all validation functions.

let ctx = SysvarContext::new()
    .with_clock(&clock_account)?
    .with_rent(&rent_account)?;

ctx.clock()?.check_not_expired(deadline)?;
ctx.clock()?.check_slot_staleness(oracle_slot, 50)?;

Implementations

impl SysvarContext

pub const fn new() -> Self

Create an empty context.

pub fn with_clock(self, clock_data: &[u8]) -> Result<Self, ProgramError>

Parse and cache the Clock sysvar.

pub fn with_rent(self, rent_data: &[u8]) -> Result<Self, ProgramError>

Parse and cache the Rent sysvar.

pub fn clock(&self) -> Result<&CachedClock, ProgramError>

Get the cached Clock. Returns error if not initialized.

pub fn rent(&self) -> Result<&CachedRent, ProgramError>

Get the cached Rent. Returns error if not initialized.

pub fn has_clock(&self) -> bool

Check if clock is available.

pub fn has_rent(&self) -> bool

Check if rent is available.

Trait Implementations

impl Default for SysvarContext

fn default() -> Self

Returns the “default value” for a type.