define and export a safe version of 'runGet'

cardano-foundation · Dec 24, 2019 · 8e87584 · 8e87584
1 parent ca2675b
commit 8e87584
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/lib/jormungandr/src/Cardano/Wallet/Jormungandr/Binary.hs b/lib/jormungandr/src/Cardano/Wallet/Jormungandr/Binary.hs
@@ -72,6 +72,7 @@ module Cardano.Wallet.Jormungandr.Binary
       -- * Re-export
     , Get
     , runGet
+    , eitherRunGet
     , runGetOrFail
     , Put
     , runPut
@@ -971,6 +972,15 @@ withRaw get = do
     raw <- getByteString (end - start)
     pure (raw, a)
 
+-- | A safe version of 'runGet' which doesn't throw on error.
+eitherRunGet
+    :: Get a
+    -> BL.ByteString
+    -> Either String a
+eitherRunGet decoder bytes = case runGetOrFail decoder bytes of
+    Right (_, _, a) -> Right a
+    Left  (_, _, e) -> Left  e
+
 {-------------------------------------------------------------------------------
                                 Conversions
 -------------------------------------------------------------------------------}