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48 lines
1.5 KiB
Haskell
48 lines
1.5 KiB
Haskell
{-|
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Acquire and release the vere lockfile.
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-}
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module Urbit.Vere.LockFile (lockFile) where
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import Urbit.Prelude
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import Urbit.King.App.Class
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import Data.Default (def)
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import RIO.Directory (createDirectoryIfMissing)
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import System.IO.LockFile.Internal (LockingParameters(..), RetryStrategy(..),
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LockingException(..), lock, unlock)
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--------------------------------------------------------------------------------
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lockFile :: (HasLogFunc e, HasStderrLogFunc e) => FilePath -> RAcquire e ()
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lockFile pax = void $ mkRAcquire start stop
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where
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fil = pax <> "/.vere.lock"
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stop handle = do
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logInfo $ display @Text $ ("Releasing lock file: " <> pack fil)
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io $ unlock fil handle
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params = def { retryToAcquireLock = No }
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start = do
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createDirectoryIfMissing True pax
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logInfo $ display @Text $ ("Taking lock file: " <> pack fil)
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handle failure $ io (lock params fil)
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failure (e :: LockingException) = do
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logStderr $ logError $ display @Text $
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"Cannot acquire lock file " <> pack fil <> "."
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logStderr $ logError $
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"Please make sure there are no other instances of this ship running, "
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<> "then try again."
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logStderr $ logError $
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"If you are sure, you can delete the file and try again."
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throwIO e
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logStderr :: HasStderrLogFunc e => RIO LogFunc a -> RIO e a
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logStderr action = do
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logFunc <- view stderrLogFuncL
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runRIO logFunc action
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