This PR helps make the Transaction type compatible with things that require MonadUnliftIO.
My motivation for this change was using Transaction together with ResourceT. runResourceT has a MonadUnliftIO constraint on it. The current lmdb-simple public API doesn't expose enough information to even write a newtype/orphan MonadUnliftIO instance for Transaction.
I implemented this in a dependency-less way: transactionWithRunInIO is the withRunInIO implementation for Transaction, and consumers of lmdb-simple can use it to write MonadUnliftIO for newtypes around Transaction.
If you don't mind taking on an unliftio-core dependency, I'd be happy to include a MonadUnliftIO instance instead. unliftio-core itself is very lightweight, only depending on base and transformers.
This PR helps make the
Transactiontype compatible with things that requireMonadUnliftIO.My motivation for this change was using
Transactiontogether withResourceT.runResourceThas aMonadUnliftIOconstraint on it. The currentlmdb-simplepublic API doesn't expose enough information to even write a newtype/orphanMonadUnliftIOinstance forTransaction.I implemented this in a dependency-less way:
transactionWithRunInIOis thewithRunInIOimplementation forTransaction, and consumers oflmdb-simplecan use it to writeMonadUnliftIOfor newtypes aroundTransaction.If you don't mind taking on an
unliftio-coredependency, I'd be happy to include aMonadUnliftIOinstance instead.unliftio-coreitself is very lightweight, only depending onbaseandtransformers.