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|
module Cache
( cached,
cachedMaybe,
)
where
-- TODO Reduce cached data size
--
-- Right now we are caching complete `Issue` instances, which
-- contain the full issue title and description. For a fast
-- lookup it may already be enough to only store the issue's
--
-- \* filename
-- \* start position
-- \* end position
--
-- With this information we can use git to quickly look up the
-- complete issue text and parse it.
--
-- @topic caching
-- @backlog
import Backend qualified
import Data.Binary (Binary, decodeFileOrFail, encodeFile)
import Data.Text qualified as T
import System.Directory (createDirectoryIfMissing, doesFileExist)
import System.FilePath ((</>))
cached :: Binary a => T.Text -> IO a -> IO a
cached key func = do
root <- Backend.getRootDir
createDirectoryIfMissing True (root </> ".anissue")
let file = (root </> ".anissue" </> T.unpack key)
doesFileExist file >>= \case
True ->
decodeFileOrFail file >>= \case
Left _ -> generate file
Right blob -> pure blob
False -> generate file
where
generate file = do
blob <- func
encodeFile file blob
pure blob
cachedMaybe :: Binary a => Maybe T.Text -> IO a -> IO a
cachedMaybe Nothing func = func
cachedMaybe (Just key) func = cached key func
|
