d05b7b9182
Make the byteRetriever be passed the callback that consumes the bytestring. This way, there's no worries about the lazy bytestring not all being read when the resource that's creating it is closed. Which in turn lets bup, ddar, and S3 each switch from using an unncessary fileRetriver to a byteRetriever. So, more efficient on chunks and encrypted files. The only remaining fileRetrievers are hook and external, which really do retrieve to files.
342 lines
11 KiB
Haskell
342 lines
11 KiB
Haskell
{- S3 remotes
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-
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- Copyright 2011-2013 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Remote.S3 (remote, iaHost, isIA, isIAHost, iaItemUrl) where
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import Network.AWS.AWSConnection
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import Network.AWS.S3Object hiding (getStorageClass)
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import Network.AWS.S3Bucket hiding (size)
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import Network.AWS.AWSResult
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import qualified Data.Text as T
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import qualified Data.Text.Encoding as T
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Map as M
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import Data.Char
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import Network.Socket (HostName)
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import Common.Annex
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import Types.Remote
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import Types.Key
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import qualified Git
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import Config
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import Config.Cost
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import Remote.Helper.Special
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import Remote.Helper.ChunkedEncryptable
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import qualified Remote.Helper.AWS as AWS
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import Creds
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import Utility.Metered
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import Annex.UUID
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import Logs.Web
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type Bucket = String
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remote :: RemoteType
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remote = RemoteType {
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typename = "S3",
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enumerate = findSpecialRemotes "s3",
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generate = gen,
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setup = s3Setup
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}
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gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
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gen r u c gc = new <$> remoteCost gc expensiveRemoteCost
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where
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new cst = Just $ chunkedEncryptableRemote c
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(prepareStore this)
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(prepareRetrieve this)
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this
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where
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this = Remote {
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uuid = u,
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cost = cst,
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name = Git.repoDescribe r,
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storeKey = storeKeyDummy,
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retrieveKeyFile = retreiveKeyFileDummy,
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retrieveKeyFileCheap = retrieveCheap this,
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removeKey = remove this c,
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hasKey = checkPresent this,
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hasKeyCheap = False,
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whereisKey = Nothing,
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remoteFsck = Nothing,
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repairRepo = Nothing,
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config = c,
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repo = r,
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gitconfig = gc,
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localpath = Nothing,
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readonly = False,
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availability = GloballyAvailable,
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remotetype = remote
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}
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s3Setup :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> Annex (RemoteConfig, UUID)
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s3Setup mu mcreds c = do
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u <- maybe (liftIO genUUID) return mu
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c' <- setRemoteCredPair c (AWS.creds u) mcreds
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s3Setup' u c'
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s3Setup' :: UUID -> RemoteConfig -> Annex (RemoteConfig, UUID)
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s3Setup' u c = if isIA c then archiveorg else defaulthost
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where
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remotename = fromJust (M.lookup "name" c)
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defbucket = remotename ++ "-" ++ fromUUID u
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defaults = M.fromList
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[ ("datacenter", T.unpack $ AWS.defaultRegion AWS.S3)
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, ("storageclass", "STANDARD")
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, ("host", defaultAmazonS3Host)
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, ("port", show defaultAmazonS3Port)
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, ("bucket", defbucket)
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]
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use fullconfig = do
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gitConfigSpecialRemote u fullconfig "s3" "true"
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return (fullconfig, u)
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defaulthost = do
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c' <- encryptionSetup c
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let fullconfig = c' `M.union` defaults
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genBucket fullconfig u
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use fullconfig
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archiveorg = do
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showNote "Internet Archive mode"
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-- Ensure user enters a valid bucket name, since
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-- this determines the name of the archive.org item.
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let bucket = replace " " "-" $ map toLower $
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fromMaybe (error "specify bucket=") $
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getBucket c
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let archiveconfig =
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-- hS3 does not pass through x-archive-* headers
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M.mapKeys (replace "x-archive-" "x-amz-") $
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-- encryption does not make sense here
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M.insert "encryption" "none" $
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M.insert "bucket" bucket $
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M.union c $
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-- special constraints on key names
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M.insert "mungekeys" "ia" $
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-- bucket created only when files are uploaded
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M.insert "x-amz-auto-make-bucket" "1" defaults
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writeUUIDFile archiveconfig u
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use archiveconfig
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prepareStore :: Remote -> Preparer Storer
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prepareStore r = resourcePrepare (const $ s3Action r False) $ \(conn, bucket) ->
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fileStorer $ \k src p -> do
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ok <- s3Bool =<< liftIO (store (conn, bucket) r k p src)
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-- Store public URL to item in Internet Archive.
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when (ok && isIA (config r) && not (isChunkKey k)) $
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setUrlPresent k (iaKeyUrl r k)
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return ok
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store :: (AWSConnection, Bucket) -> Remote -> Key -> MeterUpdate -> FilePath -> IO (AWSResult ())
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store (conn, bucket) r k p file = do
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size <- (fromIntegral . fileSize <$> getFileStatus file) :: IO Integer
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withMeteredFile file p $ \content -> do
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-- size is provided to S3 so the whole content
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-- does not need to be buffered to calculate it
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let object = S3Object
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bucket (bucketFile r k) ""
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(("Content-Length", show size) : getXheaders (config r))
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content
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sendObject conn $
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setStorageClass (getStorageClass $ config r) object
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prepareRetrieve :: Remote -> Preparer Retriever
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prepareRetrieve r = resourcePrepare (const $ s3Action r False) $ \(conn, bucket) ->
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byteRetriever $ \k sink ->
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liftIO (getObject conn $ bucketKey r bucket k)
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>>= either s3Error (sink . obj_data)
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retrieveCheap :: Remote -> Key -> FilePath -> Annex Bool
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retrieveCheap _ _ _ = return False
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{- Internet Archive doesn't easily allow removing content.
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- While it may remove the file, there are generally other files
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- derived from it that it does not remove. -}
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remove :: Remote -> RemoteConfig -> Key -> Annex Bool
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remove r c k
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| isIA c = do
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warning "Cannot remove content from the Internet Archive"
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return False
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| otherwise = remove' r k
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remove' :: Remote -> Key -> Annex Bool
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remove' r k = s3Action r False $ \(conn, bucket) ->
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s3Bool =<< liftIO (deleteObject conn $ bucketKey r bucket k)
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checkPresent :: Remote -> Key -> Annex (Either String Bool)
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checkPresent r k = s3Action r noconn $ \(conn, bucket) -> do
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showAction $ "checking " ++ name r
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res <- liftIO $ getObjectInfo conn $ bucketKey r bucket k
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case res of
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Right _ -> return $ Right True
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Left (AWSError _ _) -> return $ Right False
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Left e -> return $ Left (s3Error e)
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where
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noconn = Left $ error "S3 not configured"
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s3Warning :: ReqError -> Annex Bool
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s3Warning e = do
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warning $ prettyReqError e
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return False
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s3Error :: ReqError -> a
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s3Error e = error $ prettyReqError e
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s3Bool :: AWSResult () -> Annex Bool
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s3Bool (Right _) = return True
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s3Bool (Left e) = s3Warning e
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s3Action :: Remote -> a -> ((AWSConnection, Bucket) -> Annex a) -> Annex a
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s3Action r noconn action = do
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let bucket = M.lookup "bucket" $ config r
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conn <- s3Connection (config r) (uuid r)
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case (bucket, conn) of
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(Just b, Just c) -> action (c, b)
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_ -> return noconn
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bucketFile :: Remote -> Key -> FilePath
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bucketFile r = munge . key2file
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where
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munge s = case M.lookup "mungekeys" c of
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Just "ia" -> iaMunge $ filePrefix c ++ s
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_ -> filePrefix c ++ s
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c = config r
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filePrefix :: RemoteConfig -> String
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filePrefix = M.findWithDefault "" "fileprefix"
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bucketKey :: Remote -> Bucket -> Key -> S3Object
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bucketKey r bucket k = S3Object bucket (bucketFile r k) "" [] L.empty
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{- Internet Archive limits filenames to a subset of ascii,
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- with no whitespace. Other characters are xml entity
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- encoded. -}
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iaMunge :: String -> String
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iaMunge = (>>= munge)
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where
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munge c
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| isAsciiUpper c || isAsciiLower c || isNumber c = [c]
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| c `elem` "_-.\"" = [c]
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| isSpace c = []
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| otherwise = "&" ++ show (ord c) ++ ";"
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{- Generate the bucket if it does not already exist, including creating the
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- UUID file within the bucket.
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-
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- To check if the bucket exists, ask for its location. However, some ACLs
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- can allow read/write to buckets, but not querying location, so first
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- check if the UUID file already exists and we can skip doing anything.
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-}
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genBucket :: RemoteConfig -> UUID -> Annex ()
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genBucket c u = do
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conn <- s3ConnectionRequired c u
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showAction "checking bucket"
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unlessM ((== Right True) <$> checkUUIDFile c u conn) $ do
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loc <- liftIO $ getBucketLocation conn bucket
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case loc of
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Right _ -> writeUUIDFile c u
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Left err@(NetworkError _) -> s3Error err
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Left (AWSError _ _) -> do
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showAction $ "creating bucket in " ++ datacenter
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res <- liftIO $ createBucketIn conn bucket datacenter
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case res of
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Right _ -> writeUUIDFile c u
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Left err -> s3Error err
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where
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bucket = fromJust $ getBucket c
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datacenter = fromJust $ M.lookup "datacenter" c
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{- Writes the UUID to an annex-uuid file within the bucket.
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-
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- If the file already exists in the bucket, it must match.
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-
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- Note that IA items do not get created by createBucketIn.
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- Rather, they are created the first time a file is stored in them.
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- So this also takes care of that.
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-}
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writeUUIDFile :: RemoteConfig -> UUID -> Annex ()
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writeUUIDFile c u = do
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conn <- s3ConnectionRequired c u
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v <- checkUUIDFile c u conn
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case v of
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Left e -> error e
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Right True -> return ()
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Right False -> do
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let object = setStorageClass (getStorageClass c) (mkobject uuidb)
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either s3Error return =<< liftIO (sendObject conn object)
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where
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file = uuidFile c
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uuidb = L.fromChunks [T.encodeUtf8 $ T.pack $ fromUUID u]
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bucket = fromJust $ getBucket c
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mkobject = S3Object bucket file "" (getXheaders c)
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{- Checks if the UUID file exists in the bucket and has the specified UUID already. -}
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checkUUIDFile :: RemoteConfig -> UUID -> AWSConnection -> Annex (Either String Bool)
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checkUUIDFile c u conn = check <$> liftIO (tryNonAsync $ getObject conn $ mkobject L.empty)
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where
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check (Right (Right o))
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| obj_data o == uuidb = Right True
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| otherwise = Left $ "This bucket is already in use by a different S3 special remote, with UUID: " ++ show (obj_data o)
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check _ = Right False
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uuidb = L.fromChunks [T.encodeUtf8 $ T.pack $ fromUUID u]
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bucket = fromJust $ getBucket c
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file = uuidFile c
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mkobject = S3Object bucket file "" (getXheaders c)
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uuidFile :: RemoteConfig -> FilePath
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uuidFile c = filePrefix c ++ "annex-uuid"
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s3ConnectionRequired :: RemoteConfig -> UUID -> Annex AWSConnection
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s3ConnectionRequired c u =
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maybe (error "Cannot connect to S3") return =<< s3Connection c u
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s3Connection :: RemoteConfig -> UUID -> Annex (Maybe AWSConnection)
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s3Connection c u = go =<< getRemoteCredPairFor "S3" c (AWS.creds u)
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where
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go Nothing = return Nothing
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go (Just (ak, sk)) = return $ Just $ AWSConnection host port ak sk
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host = fromJust $ M.lookup "host" c
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port = let s = fromJust $ M.lookup "port" c in
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case reads s of
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[(p, _)] -> p
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_ -> error $ "bad S3 port value: " ++ s
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getBucket :: RemoteConfig -> Maybe Bucket
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getBucket = M.lookup "bucket"
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getStorageClass :: RemoteConfig -> StorageClass
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getStorageClass c = case fromJust $ M.lookup "storageclass" c of
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"REDUCED_REDUNDANCY" -> REDUCED_REDUNDANCY
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_ -> STANDARD
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getXheaders :: RemoteConfig -> [(String, String)]
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getXheaders = filter isxheader . M.assocs
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where
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isxheader (h, _) = "x-amz-" `isPrefixOf` h
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{- Hostname to use for archive.org S3. -}
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iaHost :: HostName
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iaHost = "s3.us.archive.org"
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isIA :: RemoteConfig -> Bool
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isIA c = maybe False isIAHost (M.lookup "host" c)
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isIAHost :: HostName -> Bool
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isIAHost h = ".archive.org" `isSuffixOf` map toLower h
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iaItemUrl :: Bucket -> URLString
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iaItemUrl bucket = "http://archive.org/details/" ++ bucket
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iaKeyUrl :: Remote -> Key -> URLString
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iaKeyUrl r k = "http://archive.org/download/" ++ bucket ++ "/" ++ bucketFile r k
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where
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bucket = fromMaybe "" $ getBucket $ config r
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