Abehjati/rename max slot difference to valid slot period (#21)

* rename to valid_slot_period
* Update doc

Author: ali-behjati

pyth-sdk-solana/src/lib.rs

@@ -16,8 +16,8 @@ pub use pyth_sdk::{
     ProductIdentifier,
 };
 
-/// Maximum acceptable slot difference before price is considered to be stale.
-pub const MAX_SLOT_DIFFERENCE: u64 = 25;
+/// Maximum valid slot period before price is considered to be stale.
+pub const VALID_SLOT_PERIOD: u64 = 25;
 
 /// Loads Pyth Price from the raw byte value of a Solana account.
 pub fn load_price(data: &[u8]) -> Result<Price, PythError> {

pyth-sdk-solana/src/state.rs

@@ -27,7 +27,7 @@ use solana_program::{
 };
 
 #[cfg(target_arch = "bpf")]
-use crate::MAX_SLOT_DIFFERENCE;
+use crate::VALID_SLOT_PERIOD;
 
 use crate::PythError;
 
@@ -339,7 +339,7 @@ impl PriceAccount {
 
         #[cfg(target_arch = "bpf")]
         if matches!(status, PriceStatus::Trading)
-            && Clock::get().unwrap().slot - self.agg.pub_slot > MAX_SLOT_DIFFERENCE
+            && Clock::get().unwrap().slot - self.agg.pub_slot > VALID_SLOT_PERIOD
         {
             status = PriceStatus::Unknown;
         }