Add ReaderT of NodeToClientVersion to LocalStateQueryExpr #4809
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newhoggy
commented
Jan 19, 2023
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| -- | Execute a local state query expression. | ||
| executeLocalStateQueryExpr | ||
| :: LocalNodeConnectInfo mode | ||
| -> Maybe ChainPoint | ||
| -> (NodeToClientVersion -> LocalStateQueryExpr (BlockInMode mode) ChainPoint (QueryInMode mode) () IO a) |
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The use of ReaderT allows this argument to simplify. This means that a query can be run like this:
executeLocalStateQueryExpr ... $ do
...
expr
...
instead of like this:
executeLocalStateQueryExpr ... $ \ntcVersion -> do
...
expr
...
We are transitioning from the later code because we want the ntcVersion to be checked automatically rather than manually. The ntcVersion argument was passed in via a lambda before because the monadic query expression previously check the version manually which is error prone.
newhoggy
commented
Jan 19, 2023
| @@ -284,7 +284,8 @@ runQueryTip (AnyConsensusModeParams cModeParams) network mOutFile = do | |||
| CardanoMode -> do | |||
| let localNodeConnInfo = LocalNodeConnectInfo cModeParams network sockPath | |||
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| eLocalState <- liftIO $ executeLocalStateQueryExpr localNodeConnInfo Nothing $ \ntcVersion -> do | |||
| eLocalState <- liftIO $ executeLocalStateQueryExpr localNodeConnInfo Nothing $ do | |||
| ntcVersion <- ask | |||
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This monadic expression checks the node to client version manually. It will switch to automatic checking in a future PR to be less error prone, but for until that capability is avilable, ntcVersion is still accessible via ask so manual check is still possible.
newhoggy
requested review from
dcoutts,
Jimbo4350,
erikd,
JaredCorduan,
LudvikGalois and
CarlosLopezDeLara
as code owners
iohk-bors
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newhoggy/introduce-ReaderT-into-LocalStateQueryExpr
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The
NodeToClientVersionfor a connection is established as soon as the connection is created an never changes. This makesReaderTa good fit for holding this value so that it can be retrieved by the monadic query expressions.