Merge pull request #11 from Trust-Machines/GRNT-1162

fix L-07

contracts/pyth-oracle-v2.clar

@@ -12,6 +12,15 @@
 ;; Balance insufficient for handling fee
 (define-constant ERR_BALANCE_INSUFFICIENT (err u402))
 
+(define-public (get-price
+    (price-feed-id (buff 32))
+    (pyth-storage-address <pyth-storage-trait>))
+  (begin
+    ;; Check execution flow
+    (try! (contract-call? .pyth-governance-v1 check-storage-contract pyth-storage-address))
+    ;; Perform contract-call
+    (contract-call? pyth-storage-address read-price-with-staleness-check price-feed-id)))
+
 (define-public (read-price-feed 
     (price-feed-id (buff 32))
     (pyth-storage-address <pyth-storage-trait>))

contracts/pyth-store-v2.clar

@@ -48,6 +48,15 @@
   (let ((entry (unwrap! (map-get? prices price-identifier) (err u404))))
     (ok entry)))
 
+(define-read-only (read-price-with-staleness-check (price-identifier (buff 32)))
+  (let (
+      (entry (unwrap! (map-get? prices price-identifier) (err u404)))
+      (stale-price-threshold (contract-call? .pyth-governance-v1 get-stale-price-threshold))
+      (latest-bitcoin-timestamp (unwrap! (get-stacks-block-info? time (- stacks-block-height u1)) ERR_STALE_PRICE))
+    )
+    (asserts! (>= (get publish-time entry) (+ (- latest-bitcoin-timestamp stale-price-threshold) STACKS_BLOCK_TIME)) ERR_STALE_PRICE)
+    (ok entry)))
+
 (define-public (write (batch-updates (list 64 {
     price-identifier: (buff 32),
     price: int,

contracts/pyth-traits-v1.clar

@@ -32,6 +32,16 @@
       prev-publish-time: uint,
     } uint))
 
+    (read-price-with-staleness-check ((buff 32)) (response {
+      price: int,
+      conf: uint,
+      expo: int,
+      ema-price: int,
+      ema-conf: uint,
+      publish-time: uint,
+      prev-publish-time: uint,
+    } uint))
+
     (write ((list 64 {
       price-identifier: (buff 32),
       price: int,