Store the error code for clients
Clients of the transactional API may need to refer to which error
occurred in order to react appropriately on transaction retries.
diff --git a/src/erlfdb.erl b/src/erlfdb.erl
index 104d282..3c49e46 100644
--- a/src/erlfdb.erl
+++ b/src/erlfdb.erl
@@ -131,10 +131,12 @@
transactional(?IS_DB = Db, UserFun) when is_function(UserFun, 1) ->
Tx = create_transaction(Db),
try
+ put(erlfdb_error, undefined),
Ret = UserFun(Tx),
wait(commit(Tx)),
Ret
catch error:{erlfdb_error, Code} ->
+ put(erlfdb_error, Code),
wait(on_error(Tx, Code)),
transactional(Db, UserFun)
end;
