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ghcup-hs/lib/GHCup/Download.hs
Julian Ospald 2c3ebe706d
Windows support
2021-05-21 17:10:22 +02:00

516 lines
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{-# LANGUAGE CPP #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-|
Module : GHCup.Download
Description : Downloading
Copyright : (c) Julian Ospald, 2020
License : LGPL-3.0
Maintainer : hasufell@hasufell.de
Stability : experimental
Portability : portable
Module for handling all download related functions.
Generally we support downloading via:
- curl (default)
- wget
- internal downloader (only when compiled)
-}
module GHCup.Download where
#if defined(INTERNAL_DOWNLOADER)
import GHCup.Download.IOStreams
import GHCup.Download.Utils
#endif
import GHCup.Errors
import GHCup.Types
import GHCup.Types.JSON ( )
import GHCup.Types.Optics
import GHCup.Utils
import GHCup.Utils.File
import GHCup.Utils.Prelude
import GHCup.Version
import Control.Applicative
import Control.Exception.Safe
import Control.Monad
#if !MIN_VERSION_base(4,13,0)
import Control.Monad.Fail ( MonadFail )
#endif
import Control.Monad.Logger
import Control.Monad.Reader
import Control.Monad.Trans.Resource
hiding ( throwM )
import Data.Aeson
import Data.Bifunctor
#if defined(INTERNAL_DOWNLOADER)
import Data.ByteString ( ByteString )
import Data.CaseInsensitive ( CI )
#endif
import Data.List.Extra
import Data.Maybe
import Data.String.Interpolate
import Data.Time.Clock
import Data.Time.Clock.POSIX
#if defined(INTERNAL_DOWNLOADER)
import Data.Time.Format
#endif
import Data.Versions
import GHC.IO.Exception
import Haskus.Utils.Variant.Excepts
import Optics
import Prelude hiding ( abs
, readFile
, writeFile
)
import System.Directory
import System.Environment
import System.FilePath
import System.IO.Error
import URI.ByteString
import qualified Crypto.Hash.SHA256 as SHA256
import qualified Data.ByteString.Base16 as B16
import qualified Data.ByteString.Lazy as L
import qualified Data.Map.Strict as M
#if defined(INTERNAL_DOWNLOADER)
import qualified Data.CaseInsensitive as CI
#endif
import qualified Data.Text as T
import qualified Data.Text.Encoding as E
import qualified Data.Yaml as Y
------------------
--[ High-level ]--
------------------
-- | Downloads the download information! But only if we need to ;P
getDownloadsF :: ( FromJSONKey Tool
, FromJSONKey Version
, FromJSON VersionInfo
, MonadIO m
, MonadCatch m
, MonadLogger m
, MonadThrow m
, MonadFail m
, MonadReader AppState m
)
=> URLSource
-> Excepts
'[JSONError , DownloadFailed , FileDoesNotExistError]
m
GHCupInfo
getDownloadsF urlSource = do
case urlSource of
GHCupURL -> liftE getBase
(OwnSource url) -> do
bs <- reThrowAll DownloadFailed $ downloadBS url
lE' JSONDecodeError $ first show $ Y.decodeEither' (L.toStrict bs)
(OwnSpec av) -> pure av
(AddSource (Left ext)) -> do
base <- liftE getBase
pure (mergeGhcupInfo base ext)
(AddSource (Right uri)) -> do
base <- liftE getBase
bsExt <- reThrowAll DownloadFailed $ downloadBS uri
ext <- lE' JSONDecodeError $ first show $ Y.decodeEither' (L.toStrict bsExt)
pure (mergeGhcupInfo base ext)
where
mergeGhcupInfo :: GHCupInfo -- ^ base to merge with
-> GHCupInfo -- ^ extension overwriting the base
-> GHCupInfo
mergeGhcupInfo (GHCupInfo tr base) (GHCupInfo _ ext) =
let new = M.mapWithKey (\k a -> case M.lookup k ext of
Just a' -> M.union a' a
Nothing -> a
) 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
let yaml_file = cacheDir </> (T.unpack . decUTF8Safe . urlBaseName $ path)
bs <-
handleIO' NoSuchThing
(\_ -> throwE $ FileDoesNotExistError yaml_file)
$ liftIO
$ L.readFile yaml_file
lE' JSONDecodeError $ first show $ 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 . first show . 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.
--
-- If not, then send a HEAD request and check for modification time.
-- Only download the file if the modification time is newer
-- than the local file.
--
-- Always save the local file with the mod time of the remote file.
smartDl :: forall m1
. ( MonadCatch m1
, MonadIO m1
, MonadFail m1
, MonadLogger m1
, MonadReader AppState m1
)
=> URI
-> Excepts
'[ FileDoesNotExistError
, HTTPStatusError
, URIParseError
, UnsupportedScheme
, NoLocationHeader
, TooManyRedirs
, ProcessError
]
m1
L.ByteString
smartDl uri' = do
AppState {dirs = Dirs {..}} <- lift ask
let path = view pathL' uri'
let json_file = cacheDir </> (T.unpack . decUTF8Safe . urlBaseName $ path)
e <- liftIO $ doesFileExist json_file
if e
then do
accessTime <- liftIO $ getAccessTime json_file
currentTime <- liftIO getCurrentTime
-- access time won't work on most linuxes, but we can try regardless
if (utcTimeToPOSIXSeconds currentTime - utcTimeToPOSIXSeconds accessTime) > 300
then do -- no access in last 5 minutes, re-check upstream mod time
getModTime >>= \case
Just modTime -> do
fileMod <- liftIO $ getModificationTime json_file
if modTime > fileMod
then dlWithMod modTime json_file
else liftIO $ L.readFile json_file
Nothing -> do
lift $ $(logDebug) [i|Unable to get/parse Last-Modified header|]
dlWithoutMod json_file
else -- access in less than 5 minutes, re-use file
liftIO $ L.readFile json_file
else do
liftIO $ createDirRecursive' cacheDir
getModTime >>= \case
Just modTime -> dlWithMod modTime json_file
Nothing -> do
-- although we don't know last-modified, we still save
-- it to a file, so we might use it in offline mode
lift $ $(logDebug) [i|Unable to get/parse Last-Modified header|]
dlWithoutMod json_file
where
dlWithMod modTime json_file = do
bs <- liftE $ downloadBS uri'
liftIO $ writeFileWithModTime modTime json_file bs
pure bs
dlWithoutMod json_file = do
bs <- liftE $ downloadBS uri'
liftIO $ hideError doesNotExistErrorType $ removeFile json_file
liftIO $ L.writeFile json_file bs
liftIO $ setModificationTime json_file (posixSecondsToUTCTime (fromIntegral @Int 0))
pure bs
getModTime = do
#if !defined(INTERNAL_DOWNLOADER)
pure Nothing
#else
headers <-
handleIO (\_ -> pure mempty)
$ liftE
$ ( catchAllE
(\_ ->
pure mempty :: Excepts '[] m1 (M.Map (CI ByteString) ByteString)
)
$ getHead uri'
)
pure $ parseModifiedHeader headers
parseModifiedHeader :: (M.Map (CI ByteString) ByteString) -> Maybe UTCTime
parseModifiedHeader headers =
(M.lookup (CI.mk "Last-Modified") headers) >>= \h -> parseTimeM
True
defaultTimeLocale
"%a, %d %b %Y %H:%M:%S %Z"
(T.unpack . decUTF8Safe $ h)
#endif
writeFileWithModTime :: UTCTime -> FilePath -> L.ByteString -> IO ()
writeFileWithModTime utctime path content = do
L.writeFile path content
setModificationTime path utctime
getDownloadInfo :: Tool
-> Version
-- ^ tool version
-> PlatformRequest
-> GHCupDownloads
-> Either NoDownload DownloadInfo
getDownloadInfo t v (PlatformRequest a p mv) dls = maybe
(Left NoDownload)
Right
(case p of
-- non-musl won't work on alpine
Linux Alpine -> with_distro <|> without_distro_ver
_ -> with_distro <|> without_distro_ver <|> without_distro
)
where
with_distro = distro_preview id id
without_distro_ver = distro_preview id (const Nothing)
without_distro = distro_preview (set _Linux UnknownLinux) (const Nothing)
distro_preview f g =
let platformVersionSpec =
preview (ix t % ix v % viArch % ix a % ix (f p)) dls
mv' = g mv
in fmap snd
. find
(\(mverRange, _) -> maybe
(isNothing mv')
(\range -> maybe False (`versionRange` range) mv')
mverRange
)
. M.toList
=<< platformVersionSpec
-- | Tries to download from the given http or https url
-- and saves the result in continuous memory into a file.
-- If the filename is not provided, then we:
-- 1. try to guess the filename from the url path
-- 2. otherwise create a random file
--
-- The file must not exist.
download :: ( MonadMask m
, MonadReader AppState m
, MonadThrow m
, MonadLogger m
, MonadIO m
)
=> DownloadInfo
-> FilePath -- ^ destination dir
-> Maybe FilePath -- ^ optional filename
-> Excepts '[DigestError , DownloadFailed] m FilePath
download dli dest mfn
| scheme == "https" = dl
| scheme == "http" = dl
| scheme == "file" = cp
| otherwise = throwE $ DownloadFailed (variantFromValue UnsupportedScheme)
where
scheme = view (dlUri % uriSchemeL' % schemeBSL') dli
cp = do
-- destination dir must exist
liftIO $ createDirRecursive' dest
let destFile = getDestFile
let fromFile = T.unpack . decUTF8Safe $ path
liftIO $ copyFile fromFile destFile
pure destFile
dl = do
let uri' = decUTF8Safe (serializeURIRef' (view dlUri dli))
lift $ $(logInfo) [i|downloading: #{uri'}|]
-- destination dir must exist
liftIO $ createDirRecursive' dest
let destFile = getDestFile
-- download
flip onException
(liftIO $ hideError doesNotExistErrorType $ removeFile destFile)
$ catchAllE @_ @'[ProcessError, DownloadFailed, UnsupportedScheme]
(\e ->
liftIO (hideError doesNotExistErrorType $ removeFile destFile)
>> (throwE . DownloadFailed $ e)
) $ do
lift getDownloader >>= \case
Curl -> do
o' <- liftIO getCurlOpts
liftE $ lEM @_ @'[ProcessError] $ liftIO $ exec "curl"
(o' ++ ["-fL", "-o", destFile, (T.unpack . decUTF8Safe) $ serializeURIRef' $ view dlUri dli]) Nothing Nothing
Wget -> do
o' <- liftIO getWgetOpts
liftE $ lEM @_ @'[ProcessError] $ liftIO $ exec "wget"
(o' ++ ["-O", destFile , (T.unpack . decUTF8Safe) $ serializeURIRef' $ view dlUri dli]) Nothing Nothing
#if defined(INTERNAL_DOWNLOADER)
Internal -> do
(https, host, fullPath, port) <- liftE $ uriToQuadruple (view dlUri dli)
liftE $ downloadToFile https host fullPath port destFile
#endif
liftE $ checkDigest dli destFile
pure destFile
-- Manage to find a file we can write the body into.
getDestFile :: FilePath
getDestFile = maybe (dest </> T.unpack (decUTF8Safe (urlBaseName path))) (dest </>) mfn
path = view (dlUri % pathL') dli
-- | Download into tmpdir or use cached version, if it exists. If filename
-- is omitted, infers the filename from the url.
downloadCached :: ( MonadMask m
, MonadResource m
, MonadThrow m
, MonadLogger m
, MonadIO m
, MonadUnliftIO m
, MonadReader AppState m
)
=> DownloadInfo
-> Maybe FilePath -- ^ optional filename
-> Excepts '[DigestError , DownloadFailed] m FilePath
downloadCached dli mfn = do
cache <- lift getCache
case cache of
True -> do
AppState {dirs = Dirs {..}} <- lift ask
let fn = fromMaybe ((T.unpack . decUTF8Safe) $ urlBaseName $ view (dlUri % pathL') dli) mfn
let cachfile = cacheDir </> fn
fileExists <- liftIO $ doesFileExist cachfile
if
| fileExists -> do
liftE $ checkDigest dli cachfile
pure cachfile
| otherwise -> liftE $ download dli cacheDir mfn
False -> do
tmp <- lift withGHCupTmpDir
liftE $ download dli tmp mfn
------------------
--[ Low-level ]--
------------------
-- | This is used for downloading the JSON.
downloadBS :: (MonadReader AppState m, MonadCatch m, MonadIO m, MonadLogger m)
=> URI
-> Excepts
'[ FileDoesNotExistError
, HTTPStatusError
, URIParseError
, UnsupportedScheme
, NoLocationHeader
, TooManyRedirs
, ProcessError
]
m
L.ByteString
downloadBS uri'
| scheme == "https"
= dl True
| scheme == "http"
= dl False
| scheme == "file"
= liftIOException doesNotExistErrorType (FileDoesNotExistError $ T.unpack $ decUTF8Safe path)
(liftIO $ L.readFile (T.unpack $ decUTF8Safe path))
| otherwise
= throwE UnsupportedScheme
where
scheme = view (uriSchemeL' % schemeBSL') uri'
path = view pathL' uri'
#if defined(INTERNAL_DOWNLOADER)
dl https = do
#else
dl _ = do
#endif
lift $ $(logDebug) [i|downloading: #{serializeURIRef' uri'}|]
lift getDownloader >>= \case
Curl -> do
o' <- liftIO getCurlOpts
let exe = "curl"
args = o' ++ ["-sSfL", T.unpack $ decUTF8Safe $ serializeURIRef' uri']
liftIO (executeOut exe args Nothing) >>= \case
CapturedProcess ExitSuccess stdout _ -> do
pure stdout
CapturedProcess (ExitFailure i') _ _ -> throwE $ NonZeroExit i' exe args
Wget -> do
o' <- liftIO getWgetOpts
let exe = "wget"
args = o' ++ ["-qO-", T.unpack $ decUTF8Safe $ serializeURIRef' uri']
liftIO (executeOut exe args Nothing) >>= \case
CapturedProcess ExitSuccess stdout _ -> do
pure stdout
CapturedProcess (ExitFailure i') _ _ -> throwE $ NonZeroExit i' exe args
#if defined(INTERNAL_DOWNLOADER)
Internal -> do
(_, host', fullPath', port') <- liftE $ uriToQuadruple uri'
liftE $ downloadBS' https host' fullPath' port'
#endif
checkDigest :: (MonadIO m, MonadThrow m, MonadLogger m, MonadReader AppState m)
=> DownloadInfo
-> FilePath
-> Excepts '[DigestError] m ()
checkDigest dli file = do
verify <- lift ask <&> (not . noVerify . settings)
when verify $ do
let p' = takeFileName file
lift $ $(logInfo) [i|verifying digest of: #{p'}|]
c <- liftIO $ L.readFile file
cDigest <- throwEither . E.decodeUtf8' . B16.encode . SHA256.hashlazy $ c
let eDigest = view dlHash dli
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 []
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