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Update find_program_address docs (#14840)

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Jack May 2021-01-25 16:03:26 -08:00 committed by GitHub
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sdk/program/src/pubkey.rs
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@ -206,13 +206,35 @@ impl Pubkey {
///
/// Panics in the very unlikely event that the additional seed could not be
/// found.
///
/// The processes of finding a valid program address is by trial and error,
/// and even though it is deterministic given a set of inputs it can take a
/// variable amount of time to succeed across different inputs. This means
/// that when called from an on-chain program it may incur a variable amount
/// of the program's compute budget. Programs that are meant to be very
/// performant may not want to use this function because it could take a
/// considerable amount of time. Also, programs that area already at risk
/// of exceeding their compute budget should also call this with care since
/// there is a chance that the program's budget may be occasionally
/// exceeded.
pub fn find_program_address(seeds: &[&[u8]], program_id: &Pubkey) -> (Pubkey, u8) {
Self::try_find_program_address(seeds, program_id)
.unwrap_or_else(|| panic!("Unable to find a viable program address bump seed"))
}
/// Find a valid program address and its corresponding bump seed which must
/// be passed as an additional seed when calling `invoke_signed`
/// be passed as an additional seed when calling `invoke_signed`.
///
/// The processes of finding a valid program address is by trial and error,
/// and even though it is deterministic given a set of inputs it can take a
/// variable amount of time to succeed across different inputs. This means
/// that when called from an on-chain program it may incur a variable amount
/// of the program's compute budget. Programs that are meant to be very
/// performant may not want to use this function because it could take a
/// considerable amount of time. Also, programs that area already at risk
/// of exceeding their compute budget should also call this with care since
/// there is a chance that the program's budget may be occasionally
/// exceeded.
#[allow(clippy::same_item_push)]
pub fn try_find_program_address(seeds: &[&[u8]], program_id: &Pubkey) -> Option<(Pubkey, u8)> {
// Perform the calculation inline, calling this from within a program is