6adbd50cd9
Added a mkUnavailable method, which a Remote can use to generate a version of itself that is not available. Implemented for several, but not yet all remotes. This allows testing that checkPresent properly throws an exceptions when it cannot check if a key is present or not. It also allows testing that the other methods don't throw exceptions in these circumstances. This immediately found several bugs, which this commit also fixes! * git remotes using ssh accidentially had checkPresent return an exception, rather than throwing it * The chunking code accidentially returned False rather than propigating an exception when there were no chunks and checkPresent threw an exception for the non-chunked key. This commit was sponsored by Carlo Matteo Capocasa.
344 lines
11 KiB
Haskell
344 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 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 $ specialRemote c
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(prepareStore this)
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(prepareRetrieve this)
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(simplyPrepare $ remove this c)
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(simplyPrepare $ checkKey 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,
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removeKey = removeKeyDummy,
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checkPresent = checkPresentDummy,
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checkPresentCheap = 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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mkUnavailable = gen r u (M.insert "host" "!dne!" c) gc
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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 :: 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 -> Remover
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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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checkKey :: Remote -> CheckPresent
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checkKey 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 True
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Left (AWSError _ _) -> return False
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Left e -> s3Error e
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where
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noconn = 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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