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Just use the cache for commands which refer to locally stored objects.

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Setting a version of GHC will fail if provided with a version not installed,
and we don't neede to check the most recent list of GHCs available to know
that.
This commit is contained in:
Huw campbell
2021-02-25 10:07:38 +11:00
committed by Huw Campbell
parent d6fa61e223
commit 1a5f0259f4
2 changed files with 48 additions and 40 deletions
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54
lib/GHCup/Download.hs
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@@ -137,30 +137,8 @@ getDownloadsF urlSource = do
bsExt <- reThrowAll DownloadFailed $ downloadBS uri
ext <- lE' JSONDecodeError $ bimap show id $ Y.decodeEither' (L.toStrict bsExt)
pure (mergeGhcupInfo base ext)
where
readFromCache :: (MonadIO m, MonadCatch m, MonadLogger m, MonadReader AppState m)
=> Excepts '[JSONError, FileDoesNotExistError] m GHCupInfo
readFromCache = do
AppState {dirs = Dirs {..}} <- lift ask
lift $ $(logWarn)
[i|Could not get download info, trying cached version (this may not be recent!)|]
let path = view pathL' ghcupURL
yaml_file <- (cacheDir </>) <$> urlBaseName path
bs <-
handleIO' NoSuchThing
(\_ -> throwE $ FileDoesNotExistError (toFilePath yaml_file))
$ liftIO
$ readFile yaml_file
lE' JSONDecodeError $ bimap show id $ Y.decodeEither' (L.toStrict bs)
getBase :: (MonadFail m, MonadIO m, MonadCatch m, MonadLogger m, MonadReader AppState m)
=> Excepts '[JSONError , FileDoesNotExistError] m GHCupInfo
getBase =
handleIO (\_ -> readFromCache)
$ catchE @_ @'[JSONError, FileDoesNotExistError]
(\(DownloadFailed _) -> readFromCache)
$ ((reThrowAll @_ @_ @'[JSONError, DownloadFailed] DownloadFailed $ smartDl ghcupURL)
>>= (liftE . lE' @_ @_ @'[JSONError] JSONDecodeError . bimap show id . Y.decodeEither' . L.toStrict))
where
mergeGhcupInfo :: GHCupInfo -- ^ base to merge with
-> GHCupInfo -- ^ extension overwriting the base
@@ -172,6 +150,32 @@ getDownloadsF urlSource = do
) base
in GHCupInfo tr new
readFromCache :: (MonadIO m, MonadCatch m, MonadLogger m, MonadReader AppState m)
=> Excepts '[JSONError, FileDoesNotExistError] m GHCupInfo
readFromCache = do
AppState {dirs = Dirs {..}} <- lift ask
lift $ $(logWarn)
[i|Could not get download info, trying cached version (this may not be recent!)|]
let path = view pathL' ghcupURL
yaml_file <- (cacheDir </>) <$> urlBaseName path
bs <-
handleIO' NoSuchThing
(\_ -> throwE $ FileDoesNotExistError (toFilePath yaml_file))
$ liftIO
$ readFile yaml_file
lE' JSONDecodeError $ bimap show id $ Y.decodeEither' (L.toStrict bs)
getBase :: (MonadFail m, MonadIO m, MonadCatch m, MonadLogger m, MonadReader AppState m)
=> Excepts '[JSONError , FileDoesNotExistError] m GHCupInfo
getBase =
handleIO (\_ -> readFromCache)
$ catchE @_ @'[JSONError, FileDoesNotExistError]
(\(DownloadFailed _) -> readFromCache)
$ ((reThrowAll @_ @_ @'[JSONError, DownloadFailed] DownloadFailed $ smartDl ghcupURL)
>>= (liftE . lE' @_ @_ @'[JSONError] JSONDecodeError . bimap show id . Y.decodeEither' . L.toStrict))
where
-- First check if the json file is in the ~/.ghcup/cache dir
-- and check it's access time. If it has been accessed within the
-- last 5 minutes, just reuse it.
@@ -209,8 +213,8 @@ getDownloadsF urlSource = do
then do
accessTime <-
PF.accessTimeHiRes
<$> (liftIO $ PF.getFileStatus (toFilePath json_file))
currentTime <- liftIO $ getPOSIXTime
<$> liftIO (PF.getFileStatus (toFilePath json_file))
currentTime <- liftIO getPOSIXTime
-- access time won't work on most linuxes, but we can try regardless
if (currentTime - accessTime) > 300