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authorGravatar Joey Hess <joey@kitenet.net>2014-08-06 13:45:19 -0400
committerGravatar Joey Hess <joey@kitenet.net>2014-08-06 13:45:19 -0400
commitcc2606ce542e04c22cf229d536ad621f9e25c12d (patch)
tree27601f447942bcefbfcb89c6588f330d7580098c /Remote/Tahoe.hs
parent5cd02fd1a52b3f1c19b01f4a021a7c63b96796dd (diff)
pushed checkPresent exception handling out of Remote implementations
I tend to prefer moving toward explicit exception handling, not away from it, but in this case, I think there are good reasons to let checkPresent throw exceptions: 1. They can all be caught in one place (Remote.hasKey), and we know every possible exception is caught there now, which we didn't before. 2. It simplified the code of the Remotes. I think it makes sense for Remotes to be able to be implemented without needing to worry about catching exceptions inside them. (Mostly.) 3. Types.StoreRetrieve.Preparer can only work on things that return a Bool, which all the other relevant remote methods already did. I do not see a good way to generalize that type; my previous attempts failed miserably.
Diffstat (limited to 'Remote/Tahoe.hs')
-rw-r--r--Remote/Tahoe.hs20
1 files changed, 11 insertions, 9 deletions
diff --git a/Remote/Tahoe.hs b/Remote/Tahoe.hs
index d265d7ac1..6e52c0981 100644
--- a/Remote/Tahoe.hs
+++ b/Remote/Tahoe.hs
@@ -72,8 +72,8 @@ gen r u c gc = do
retrieveKeyFile = retrieve u hdl,
retrieveKeyFileCheap = \_ _ -> return False,
removeKey = remove,
- hasKey = checkPresent u hdl,
- hasKeyCheap = False,
+ checkPresent = checkKey u hdl,
+ checkPresentCheap = False,
whereisKey = Nothing,
remoteFsck = Nothing,
repairRepo = Nothing,
@@ -123,14 +123,16 @@ remove _k = do
warning "content cannot be removed from tahoe remote"
return False
-checkPresent :: UUID -> TahoeHandle -> Key -> Annex (Either String Bool)
-checkPresent u hdl k = go =<< getCapability u k
+checkKey :: UUID -> TahoeHandle -> Key -> Annex Bool
+checkKey u hdl k = go =<< getCapability u k
where
- go Nothing = return (Right False)
- go (Just cap) = liftIO $ parseCheck <$> readTahoe hdl "check"
- [ Param "--raw"
- , Param cap
- ]
+ go Nothing = return False
+ go (Just cap) = liftIO $ do
+ v <- parseCheck <$> readTahoe hdl "check"
+ [ Param "--raw"
+ , Param cap
+ ]
+ either error return v
defaultTahoeConfigDir :: UUID -> IO TahoeConfigDir
defaultTahoeConfigDir u = do