607 lines
23 KiB
Haskell
607 lines
23 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeFamilies #-}
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{-|
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Module : GHCup.Download
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Description : Downloading
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Copyright : (c) Julian Ospald, 2020
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License : LGPL-3.0
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Maintainer : hasufell@hasufell.de
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Stability : experimental
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Portability : portable
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Module for handling all download related functions.
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Generally we support downloading via:
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- curl (default)
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- wget
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- internal downloader (only when compiled)
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-}
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module GHCup.Download where
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#if defined(INTERNAL_DOWNLOADER)
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import GHCup.Download.IOStreams
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import GHCup.Download.Utils
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#endif
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import GHCup.Errors
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import GHCup.Types
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import GHCup.Types.JSON ( )
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import GHCup.Types.Optics
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import GHCup.Utils.Dirs
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import GHCup.Utils.File
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import GHCup.Utils.Prelude
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import GHCup.Version
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import Control.Applicative
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import Control.Exception.Safe
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import Control.Monad
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#if !MIN_VERSION_base(4,13,0)
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import Control.Monad.Fail ( MonadFail )
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#endif
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import Control.Monad.Logger
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import Control.Monad.Reader
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import Control.Monad.Trans.Resource
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hiding ( throwM )
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import Data.Aeson
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import Data.Bifunctor
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import Data.ByteString ( ByteString )
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#if defined(INTERNAL_DOWNLOADER)
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import Data.CaseInsensitive ( mk )
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#endif
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import Data.List.Extra
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import Data.Maybe
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import Data.Time.Clock
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import Data.Time.Clock.POSIX
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import Data.Versions
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import Data.Word8 hiding ( isSpace )
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import Haskus.Utils.Variant.Excepts
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#if defined(INTERNAL_DOWNLOADER)
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import Network.Http.Client hiding ( URL )
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#endif
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import Optics
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import Prelude hiding ( abs
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, readFile
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, writeFile
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)
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import System.Directory
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import System.Environment
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import System.Exit
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import System.FilePath
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import System.IO.Error
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import System.IO.Temp
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import Text.PrettyPrint.HughesPJClass ( prettyShow )
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import URI.ByteString
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import qualified Crypto.Hash.SHA256 as SHA256
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import qualified Data.ByteString as B
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import qualified Data.ByteString.Base16 as B16
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Map.Strict as M
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import qualified Data.Text as T
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import qualified Data.Text.IO as T
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import qualified Data.Text.Encoding as E
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import qualified Data.Yaml as Y
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------------------
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--[ High-level ]--
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------------------
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-- | Downloads the download information! But only if we need to ;P
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getDownloadsF :: ( FromJSONKey Tool
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, FromJSONKey Version
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, FromJSON VersionInfo
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, MonadReader env m
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, HasSettings env
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, HasDirs env
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, MonadIO m
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, MonadCatch m
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, MonadLogger m
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, MonadThrow m
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, MonadFail m
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, MonadMask m
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)
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=> Excepts
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'[JSONError , DownloadFailed , FileDoesNotExistError]
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m
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GHCupInfo
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getDownloadsF = do
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Settings { urlSource } <- lift getSettings
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case urlSource of
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GHCupURL -> liftE $ getBase ghcupURL
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(OwnSource url) -> liftE $ getBase url
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(OwnSpec av) -> pure av
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(AddSource (Left ext)) -> do
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base <- liftE $ getBase ghcupURL
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pure (mergeGhcupInfo base ext)
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(AddSource (Right uri)) -> do
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base <- liftE $ getBase ghcupURL
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ext <- liftE $ getBase uri
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pure (mergeGhcupInfo base ext)
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where
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mergeGhcupInfo :: GHCupInfo -- ^ base to merge with
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-> GHCupInfo -- ^ extension overwriting the base
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-> GHCupInfo
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mergeGhcupInfo (GHCupInfo tr base base2) (GHCupInfo _ ext ext2) =
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let newDownloads = M.mapWithKey (\k a -> case M.lookup k ext of
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Just a' -> M.union a' a
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Nothing -> a
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) base
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newGlobalTools = M.union base2 ext2
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in GHCupInfo tr newDownloads newGlobalTools
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yamlFromCache :: (MonadReader env m, HasDirs env) => URI -> m FilePath
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yamlFromCache uri = do
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Dirs{..} <- getDirs
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pure (cacheDir </> (T.unpack . decUTF8Safe . urlBaseName . view pathL' $ uri))
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etagsFile :: FilePath -> FilePath
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etagsFile = (<.> "etags")
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getBase :: ( MonadReader env m
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, HasDirs env
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, HasSettings env
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, MonadFail m
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, MonadIO m
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, MonadCatch m
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, MonadLogger m
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, MonadMask m
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)
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=> URI
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-> Excepts '[JSONError] m GHCupInfo
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getBase uri = do
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Settings { noNetwork } <- lift getSettings
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-- try to download yaml... usually this writes it into cache dir,
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-- but in some cases not (e.g. when using file://), so we honour
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-- the return filepath, if any
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mYaml <- if noNetwork && view (uriSchemeL' % schemeBSL') uri /= "file" -- for file://, let it fall through
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then pure Nothing
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else handleIO (\e -> warnCache (displayException e) >> pure Nothing)
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. catchE @_ @_ @'[] (\e@(DownloadFailed _) -> warnCache (prettyShow e) >> pure Nothing)
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. reThrowAll @_ @_ @'[DownloadFailed] DownloadFailed
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. fmap Just
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. smartDl
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$ uri
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-- if we didn't get a filepath from the download, use the cached yaml
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actualYaml <- maybe (lift $ yamlFromCache uri) pure mYaml
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lift $ $(logDebug) $ "Decoding yaml at: " <> T.pack actualYaml
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liftE
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. onE_ (onError actualYaml)
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. lEM' @_ @_ @'[JSONError] JSONDecodeError
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. fmap (first (\e -> unlines [displayException e
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,"Consider removing " <> actualYaml <> " manually."]))
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. liftIO
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. Y.decodeFileEither
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$ actualYaml
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where
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-- On error, remove the etags file and set access time to 0. This should ensure the next invocation
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-- may re-download and succeed.
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onError :: (MonadLogger m, MonadMask m, MonadCatch m, MonadIO m) => FilePath -> m ()
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onError fp = do
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let efp = etagsFile fp
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handleIO (\e -> $(logWarn) $ "Couldn't remove file " <> T.pack efp <> ", error was: " <> T.pack (displayException e))
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(hideError doesNotExistErrorType $ rmFile efp)
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liftIO $ hideError doesNotExistErrorType $ setAccessTime fp (posixSecondsToUTCTime (fromIntegral @Int 0))
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warnCache s = do
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lift $ $(logWarn) "Could not get download info, trying cached version (this may not be recent!)"
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lift $ $(logDebug) $ "Error was: " <> T.pack s
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-- First check if the json file is in the ~/.ghcup/cache dir
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-- and check it's access time. If it has been accessed within the
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-- last 5 minutes, just reuse it.
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--
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-- Always save the local file with the mod time of the remote file.
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smartDl :: forall m1 env1
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. ( MonadReader env1 m1
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, HasDirs env1
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, HasSettings env1
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, MonadCatch m1
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, MonadIO m1
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, MonadFail m1
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, MonadLogger m1
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, MonadMask m1
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)
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=> URI
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-> Excepts
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'[ DownloadFailed
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, DigestError
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]
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m1
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FilePath
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smartDl uri' = do
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json_file <- lift $ yamlFromCache uri'
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let scheme = view (uriSchemeL' % schemeBSL') uri'
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e <- liftIO $ doesFileExist json_file
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currentTime <- liftIO getCurrentTime
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Dirs { cacheDir } <- lift getDirs
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-- for local files, let's short-circuit and ignore access time
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if | scheme == "file" -> liftE $ download uri' Nothing cacheDir Nothing True
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| e -> do
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accessTime <- liftIO $ getAccessTime json_file
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-- access time won't work on most linuxes, but we can try regardless
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if | ((utcTimeToPOSIXSeconds currentTime - utcTimeToPOSIXSeconds accessTime) > 300) ->
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-- no access in last 5 minutes, re-check upstream mod time
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dlWithMod currentTime json_file
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| otherwise -> pure json_file
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| otherwise -> dlWithMod currentTime json_file
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where
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dlWithMod modTime json_file = do
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let (dir, fn) = splitFileName json_file
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f <- liftE $ download uri' Nothing dir (Just fn) True
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liftIO $ setModificationTime f modTime
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liftIO $ setAccessTime f modTime
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pure f
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getDownloadInfo :: ( MonadReader env m
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, HasPlatformReq env
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, HasGHCupInfo env
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)
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=> Tool
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-> Version
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-- ^ tool version
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-> Excepts
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'[NoDownload]
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m
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DownloadInfo
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getDownloadInfo t v = do
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(PlatformRequest a p mv) <- lift getPlatformReq
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GHCupInfo { _ghcupDownloads = dls } <- lift getGHCupInfo
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let distro_preview f g =
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let platformVersionSpec =
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preview (ix t % ix v % viArch % ix a % ix (f p)) dls
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mv' = g mv
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in fmap snd
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. find
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(\(mverRange, _) -> maybe
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(isNothing mv')
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(\range -> maybe False (`versionRange` range) mv')
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mverRange
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)
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. M.toList
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=<< platformVersionSpec
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with_distro = distro_preview id id
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without_distro_ver = distro_preview id (const Nothing)
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without_distro = distro_preview (set _Linux UnknownLinux) (const Nothing)
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maybe
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(throwE NoDownload)
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pure
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(case p of
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-- non-musl won't work on alpine
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Linux Alpine -> with_distro <|> without_distro_ver
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_ -> with_distro <|> without_distro_ver <|> without_distro
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)
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-- | Tries to download from the given http or https url
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-- and saves the result in continuous memory into a file.
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-- If the filename is not provided, then we:
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-- 1. try to guess the filename from the url path
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-- 2. otherwise create a random file
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--
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-- The file must not exist.
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download :: ( MonadReader env m
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, HasSettings env
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, HasDirs env
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, MonadMask m
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, MonadThrow m
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, MonadLogger m
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, MonadIO m
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)
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=> URI
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-> Maybe T.Text -- ^ expected hash
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-> FilePath -- ^ destination dir (ignored for file:// scheme)
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-> Maybe FilePath -- ^ optional filename
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-> Bool -- ^ whether to read an write etags
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-> Excepts '[DigestError , DownloadFailed] m FilePath
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download uri eDigest dest mfn etags
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| scheme == "https" = dl
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| scheme == "http" = dl
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| scheme == "file" = do
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let destFile' = T.unpack . decUTF8Safe $ path
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lift $ $(logDebug) $ "using local file: " <> T.pack destFile'
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forM_ eDigest (liftE . flip checkDigest destFile')
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pure destFile'
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| otherwise = throwE $ DownloadFailed (variantFromValue UnsupportedScheme)
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where
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scheme = view (uriSchemeL' % schemeBSL') uri
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dl = do
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destFile <- liftE . reThrowAll @_ @_ @'[DownloadFailed] DownloadFailed $ getDestFile
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lift $ $(logInfo) $ "downloading: " <> uri' <> " as file " <> T.pack destFile
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-- destination dir must exist
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liftIO $ createDirRecursive' dest
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-- download
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flip onException
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(lift $ hideError doesNotExistErrorType $ recycleFile destFile)
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$ catchAllE @_ @'[ProcessError, DownloadFailed, UnsupportedScheme]
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(\e ->
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lift (hideError doesNotExistErrorType $ recycleFile destFile)
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>> (throwE . DownloadFailed $ e)
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) $ do
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Settings{ downloader, noNetwork } <- lift getSettings
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when noNetwork $ throwE (DownloadFailed (V NoNetwork :: V '[NoNetwork]))
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case downloader of
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Curl -> do
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o' <- liftIO getCurlOpts
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if etags
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then do
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dh <- liftIO $ emptySystemTempFile "curl-header"
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flip finally (try @_ @SomeException $ rmFile dh) $
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flip finally (try @_ @SomeException $ rmFile (destFile <.> "tmp")) $ do
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metag <- readETag destFile
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liftE $ lEM @_ @'[ProcessError] $ exec "curl"
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(o' ++ (if etags then ["--dump-header", dh] else [])
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++ maybe [] (\t -> ["-H", "If-None-Match: " <> T.unpack t]) metag
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++ ["-fL", "-o", destFile <.> "tmp", T.unpack uri']) Nothing Nothing
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headers <- liftIO $ T.readFile dh
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-- this nonsense is necessary, because some older versions of curl would overwrite
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-- the destination file when 304 is returned
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case fmap T.words . listToMaybe . fmap T.strip . T.lines . getLastHeader $ headers of
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Just (http':sc:_)
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| sc == "304"
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, T.pack "HTTP" `T.isPrefixOf` http' -> $logDebug "Status code was 304, not overwriting"
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| T.pack "HTTP" `T.isPrefixOf` http' -> do
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$logDebug $ "Status code was " <> sc <> ", overwriting"
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liftIO $ copyFile (destFile <.> "tmp") destFile
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_ -> liftE $ throwE @_ @'[DownloadFailed] (DownloadFailed (toVariantAt @0 (MalformedHeaders headers)
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:: V '[MalformedHeaders]))
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writeEtags destFile (parseEtags headers)
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else
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liftE $ lEM @_ @'[ProcessError] $ exec "curl"
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(o' ++ ["-fL", "-o", destFile, T.unpack uri']) Nothing Nothing
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Wget -> do
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destFileTemp <- liftIO $ emptySystemTempFile "wget-tmp"
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flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
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o' <- liftIO getWgetOpts
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if etags
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then do
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metag <- readETag destFile
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let opts = o' ++ maybe [] (\t -> ["--header", "If-None-Match: " <> T.unpack t]) metag
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++ ["-q", "-S", "-O", destFileTemp , T.unpack uri']
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CapturedProcess {_exitCode, _stdErr} <- lift $ executeOut "wget" opts Nothing
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case _exitCode of
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ExitSuccess -> do
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liftIO $ copyFile destFileTemp destFile
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writeEtags destFile (parseEtags (decUTF8Safe' _stdErr))
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ExitFailure i'
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| i' == 8
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, Just _ <- find (T.pack "304 Not Modified" `T.isInfixOf`) . T.lines . decUTF8Safe' $ _stdErr
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-> do
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$logDebug "Not modified, skipping download"
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writeEtags destFile (parseEtags (decUTF8Safe' _stdErr))
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| otherwise -> throwE (NonZeroExit i' "wget" opts)
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else do
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let opts = o' ++ ["-O", destFileTemp , T.unpack uri']
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liftE $ lEM @_ @'[ProcessError] $ exec "wget" opts Nothing Nothing
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liftIO $ copyFile destFileTemp destFile
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#if defined(INTERNAL_DOWNLOADER)
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Internal -> do
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(https, host, fullPath, port) <- liftE $ uriToQuadruple uri
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if etags
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then do
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metag <- readETag destFile
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let addHeaders = maybe mempty (\etag -> M.fromList [ (mk . E.encodeUtf8 . T.pack $ "If-None-Match"
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, E.encodeUtf8 etag)]) metag
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liftE
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$ catchE @HTTPNotModified @'[DownloadFailed] @'[] (\(HTTPNotModified etag) -> lift $ writeEtags destFile (pure $ Just etag))
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$ do
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r <- downloadToFile https host fullPath port destFile addHeaders
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writeEtags destFile (pure $ decUTF8Safe <$> getHeader r "etag")
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else void $ liftE $ catchE @HTTPNotModified
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@'[DownloadFailed]
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(\e@(HTTPNotModified _) ->
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throwE @_ @'[DownloadFailed] (DownloadFailed (toVariantAt @0 e :: V '[HTTPNotModified])))
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$ downloadToFile https host fullPath port destFile mempty
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#endif
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forM_ eDigest (liftE . flip checkDigest destFile)
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pure destFile
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-- Manage to find a file we can write the body into.
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getDestFile :: Monad m => Excepts '[NoUrlBase] m FilePath
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getDestFile =
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case mfn of
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Just fn -> pure (dest </> fn)
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Nothing
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| let urlBase = T.unpack (decUTF8Safe (urlBaseName path))
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, not (null urlBase) -> pure (dest </> urlBase)
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-- TODO: remove this once we use hpath again
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| otherwise -> throwE $ NoUrlBase uri'
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path = view pathL' uri
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uri' = decUTF8Safe (serializeURIRef' uri)
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parseEtags :: (MonadLogger m, MonadIO m, MonadThrow m) => T.Text -> m (Maybe T.Text)
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parseEtags stderr = do
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let mEtag = find (\line -> T.pack "etag:" `T.isPrefixOf` T.toLower line) . fmap T.strip . T.lines . getLastHeader $ stderr
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case T.words <$> mEtag of
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(Just []) -> do
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$logDebug "Couldn't parse etags, no input: "
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pure Nothing
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(Just [_, etag']) -> do
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$logDebug $ "Parsed etag: " <> etag'
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pure (Just etag')
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(Just xs) -> do
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$logDebug ("Couldn't parse etags, unexpected input: " <> T.unwords xs)
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pure Nothing
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Nothing -> do
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$logDebug "No etags header found"
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pure Nothing
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writeEtags :: (MonadLogger m, MonadIO m, MonadThrow m) => FilePath -> m (Maybe T.Text) -> m ()
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writeEtags destFile getTags = do
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getTags >>= \case
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Just t -> do
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$logDebug $ "Writing etagsFile " <> T.pack (etagsFile destFile)
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liftIO $ T.writeFile (etagsFile destFile) t
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Nothing ->
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$logDebug "No etags files written"
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readETag :: (MonadLogger m, MonadCatch m, MonadIO m) => FilePath -> m (Maybe T.Text)
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readETag fp = do
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e <- liftIO $ doesFileExist fp
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if e
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then do
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rE <- try @_ @SomeException $ liftIO $ fmap stripNewline' $ T.readFile (etagsFile fp)
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case rE of
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(Right et) -> do
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$logDebug $ "Read etag: " <> et
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pure (Just et)
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(Left _) -> do
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$logDebug "Etag file doesn't exist (yet)"
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pure Nothing
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else do
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$logDebug $ "Skipping and deleting etags file because destination file " <> T.pack fp <> " doesn't exist"
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liftIO $ hideError doesNotExistErrorType $ rmFile (etagsFile fp)
|
|
pure Nothing
|
|
|
|
|
|
-- | Download into tmpdir or use cached version, if it exists. If filename
|
|
-- is omitted, infers the filename from the url.
|
|
downloadCached :: ( MonadReader env m
|
|
, HasDirs env
|
|
, HasSettings env
|
|
, MonadMask m
|
|
, MonadResource m
|
|
, MonadThrow m
|
|
, MonadLogger m
|
|
, MonadIO m
|
|
, MonadUnliftIO m
|
|
)
|
|
=> DownloadInfo
|
|
-> Maybe FilePath -- ^ optional filename
|
|
-> Excepts '[DigestError , DownloadFailed] m FilePath
|
|
downloadCached dli mfn = do
|
|
Settings{ cache } <- lift getSettings
|
|
case cache of
|
|
True -> downloadCached' dli mfn Nothing
|
|
False -> do
|
|
tmp <- lift withGHCupTmpDir
|
|
liftE $ download (_dlUri dli) (Just (_dlHash dli)) tmp mfn False
|
|
|
|
|
|
downloadCached' :: ( MonadReader env m
|
|
, HasDirs env
|
|
, HasSettings env
|
|
, MonadMask m
|
|
, MonadThrow m
|
|
, MonadLogger m
|
|
, MonadIO m
|
|
, MonadUnliftIO m
|
|
)
|
|
=> DownloadInfo
|
|
-> Maybe FilePath -- ^ optional filename
|
|
-> Maybe FilePath -- ^ optional destination dir (default: cacheDir)
|
|
-> Excepts '[DigestError , DownloadFailed] m FilePath
|
|
downloadCached' dli mfn mDestDir = do
|
|
Dirs { cacheDir } <- lift getDirs
|
|
let destDir = fromMaybe cacheDir mDestDir
|
|
let fn = fromMaybe ((T.unpack . decUTF8Safe) $ urlBaseName $ view (dlUri % pathL') dli) mfn
|
|
let cachfile = destDir </> fn
|
|
fileExists <- liftIO $ doesFileExist cachfile
|
|
if
|
|
| fileExists -> do
|
|
liftE $ checkDigest (view dlHash dli) cachfile
|
|
pure cachfile
|
|
| otherwise -> liftE $ download (_dlUri dli) (Just (_dlHash dli)) destDir mfn False
|
|
|
|
|
|
|
|
|
|
------------------
|
|
--[ Low-level ]--
|
|
------------------
|
|
|
|
|
|
|
|
checkDigest :: ( MonadReader env m
|
|
, HasDirs env
|
|
, HasSettings env
|
|
, MonadIO m
|
|
, MonadThrow m
|
|
, MonadLogger m
|
|
)
|
|
=> T.Text -- ^ the hash
|
|
-> FilePath
|
|
-> Excepts '[DigestError] m ()
|
|
checkDigest eDigest file = do
|
|
Settings{ noVerify } <- lift getSettings
|
|
let verify = not noVerify
|
|
when verify $ do
|
|
let p' = takeFileName file
|
|
lift $ $(logInfo) $ "verifying digest of: " <> T.pack p'
|
|
c <- liftIO $ L.readFile file
|
|
cDigest <- throwEither . E.decodeUtf8' . B16.encode . SHA256.hashlazy $ c
|
|
when ((cDigest /= eDigest) && verify) $ throwE (DigestError cDigest eDigest)
|
|
|
|
|
|
-- | Get additional curl args from env. This is an undocumented option.
|
|
getCurlOpts :: IO [String]
|
|
getCurlOpts =
|
|
lookupEnv "GHCUP_CURL_OPTS" >>= \case
|
|
Just r -> pure $ splitOn " " r
|
|
Nothing -> pure []
|
|
|
|
|
|
-- | Get additional wget args from env. This is an undocumented option.
|
|
getWgetOpts :: IO [String]
|
|
getWgetOpts =
|
|
lookupEnv "GHCUP_WGET_OPTS" >>= \case
|
|
Just r -> pure $ splitOn " " r
|
|
Nothing -> pure []
|
|
|
|
|
|
-- | Get the url base name.
|
|
--
|
|
-- >>> urlBaseName "/foo/bar/baz"
|
|
-- "baz"
|
|
urlBaseName :: ByteString -- ^ the url path (without scheme and host)
|
|
-> ByteString
|
|
urlBaseName = snd . B.breakEnd (== _slash) . urlDecode False
|
|
|
|
|
|
-- | Curl saves all intermediate connect headers as well, not just the last one, so we make an effort to take the
|
|
-- last HTTP block only. Passing '--suppress-connect-headers' would be better, but it isn't supported by all versions,
|
|
-- also see:
|
|
-- https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/213
|
|
--
|
|
-- >>> getLastHeader "\n\nHTTP/1.0 200 Connection established\n\nHTTP/1.1 304 Not Modified\n"
|
|
-- "HTTP/1.1 304 Not Modified\n"
|
|
-- >>> getLastHeader "HTTP/1.1 304 Not Modified\n"
|
|
-- "HTTP/1.1 304 Not Modified\n"
|
|
getLastHeader :: T.Text -> T.Text
|
|
getLastHeader = T.unlines . lastDef [] . filter (\x -> not (null x)) . splitOn [""] . fmap T.stripEnd . T.lines
|