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{- Amazon S3 remotes.
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Remote.S3 (remote) where
import Control.Exception.Extensible (IOException)
import Network.AWS.AWSConnection
import Network.AWS.S3Object
import Network.AWS.S3Bucket hiding (size)
import Network.AWS.AWSResult
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Map as M
import Data.Maybe
import Control.Monad (when)
import Control.Monad.State (liftIO)
import System.Environment
import System.Posix.Files
import System.Directory
import RemoteClass
import Types
import qualified GitRepo as Git
import qualified Annex
import UUID
import Messages
import Locations
import Config
import Remote.Special
import Remote.Encryptable
import Crypto
import Key
remote :: RemoteType Annex
remote = RemoteType {
typename = "S3",
enumerate = findSpecialRemotes "s3",
generate = gen,
setup = s3Setup
}
gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
gen r u c = do
cst <- remoteCost r expensiveRemoteCost
return $ gen' r u c cst
gen' :: Git.Repo -> UUID -> Maybe RemoteConfig -> Int -> Remote Annex
gen' r u c cst =
encryptableRemote c
(storeEncrypted this)
(retrieveEncrypted this)
this
where
this = Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = store this,
retrieveKeyFile = retrieve this,
removeKey = remove this,
hasKey = checkPresent this,
hasKeyCheap = False,
config = c
}
s3Setup :: UUID -> RemoteConfig -> Annex RemoteConfig
s3Setup u c = do
-- verify configuration is sane
c' <- encryptionSetup c
let fullconfig = M.union c' defaults
-- check bucket location to see if the bucket exists, and create it
let datacenter = fromJust $ M.lookup "datacenter" fullconfig
conn <- s3ConnectionRequired fullconfig
showNote "checking bucket"
loc <- liftIO $ getBucketLocation conn bucket
case loc of
Right _ -> return ()
Left err@(NetworkError _) -> s3Error err
Left (AWSError _ _) -> do
showNote $ "creating bucket in " ++ datacenter
res <- liftIO $ createBucketIn conn bucket datacenter
case res of
Right _ -> return ()
Left err -> s3Error err
gitConfigSpecialRemote u fullconfig "s3" "true"
return fullconfig
where
remotename = fromJust (M.lookup "name" c)
bucket = remotename ++ "-" ++ u
defaults = M.fromList
[ ("datacenter", "US")
, ("storageclass", "STANDARD")
, ("host", defaultAmazonS3Host)
, ("port", show defaultAmazonS3Port)
, ("bucket", bucket)
]
store :: Remote Annex -> Key -> Annex Bool
store r k = s3Action r False $ \(conn, bucket) -> do
g <- Annex.gitRepo
res <- liftIO $ storeHelper (conn, bucket) r k $ gitAnnexLocation g k
s3Bool res
storeEncrypted :: Remote Annex -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted r (cipher, enck) k = s3Action r False $ \(conn, bucket) -> do
g <- Annex.gitRepo
let f = gitAnnexLocation g k
-- To get file size of the encrypted content, have to use a temp file.
-- (An alternative would be chunking to to a constant size.)
let tmp = gitAnnexTmpLocation g enck
liftIO $ withEncryptedContent cipher (L.readFile f) $ \s -> L.writeFile tmp s
res <- liftIO $ storeHelper (conn, bucket) r enck tmp
tmp_exists <- liftIO $ doesFileExist tmp
when tmp_exists $ liftIO $ removeFile tmp
s3Bool res
storeHelper :: (AWSConnection, String) -> Remote Annex -> Key -> FilePath -> IO (AWSResult ())
storeHelper (conn, bucket) r k file = do
content <- liftIO $ L.readFile file
-- size is provided to S3 so the whole content does not need to be
-- buffered to calculate it
size <- case keySize k of
Just s -> return $ fromIntegral s
Nothing -> do
s <- liftIO $ getFileStatus file
return $ fileSize s
let object = setStorageClass storageclass $
S3Object bucket (show k) ""
[("Content-Length",(show size))] content
sendObject conn object
where
storageclass =
case fromJust $ M.lookup "storageclass" $ fromJust $ config r of
"REDUCED_REDUNDANCY" -> REDUCED_REDUNDANCY
_ -> STANDARD
retrieve :: Remote Annex -> Key -> FilePath -> Annex Bool
retrieve r k f = s3Action r False $ \(conn, bucket) -> do
res <- liftIO $ getObject conn $ bucketKey bucket k
case res of
Right o -> do
liftIO $ L.writeFile f $ obj_data o
return True
Left e -> s3Warning e
retrieveEncrypted :: Remote Annex -> (Cipher, Key) -> FilePath -> Annex Bool
retrieveEncrypted r (cipher, enck) f = s3Action r False $ \(conn, bucket) -> do
res <- liftIO $ getObject conn $ bucketKey bucket enck
case res of
Right o -> liftIO $
withDecryptedContent cipher (return $ obj_data o) $ \content -> do
L.writeFile f content
return True
Left e -> s3Warning e
remove :: Remote Annex -> Key -> Annex Bool
remove r k = s3Action r False $ \(conn, bucket) -> do
res <- liftIO $ deleteObject conn $ bucketKey bucket k
s3Bool res
checkPresent :: Remote Annex -> Key -> Annex (Either IOException Bool)
checkPresent r k = s3Action r noconn $ \(conn, bucket) -> do
showNote ("checking " ++ name r ++ "...")
res <- liftIO $ getObjectInfo conn $ bucketKey bucket k
case res of
Right _ -> return $ Right True
Left (AWSError _ _) -> return $ Right False
Left e -> return $ Left (s3Error e)
where
noconn = Left $ error "S3 not configured"
s3Warning :: ReqError -> Annex Bool
s3Warning e = do
warning $ prettyReqError e
return False
s3Error :: ReqError -> a
s3Error e = error $ prettyReqError e
s3Bool :: AWSResult () -> Annex Bool
s3Bool res = do
case res of
Right _ -> return True
Left e -> s3Warning e
s3ConnectionRequired :: RemoteConfig -> Annex AWSConnection
s3ConnectionRequired c = do
conn <- s3Connection c
case conn of
Nothing -> error "Cannot connect to S3"
Just conn' -> return conn'
s3Connection :: RemoteConfig -> Annex (Maybe AWSConnection)
s3Connection c = do
ak <- getEnvKey "AWS_ACCESS_KEY_ID"
sk <- getEnvKey "AWS_SECRET_ACCESS_KEY"
if (null ak || null sk)
then do
warning "Set both AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY to use S3"
return Nothing
else return $ Just $ AWSConnection host port ak sk
where
host = fromJust $ (M.lookup "host" c)
port = let s = fromJust $ (M.lookup "port" c) in
case reads s of
[(p, _)] -> p
_ -> error $ "bad S3 port value: " ++ s
getEnvKey s = liftIO $ catch (getEnv s) (const $ return "")
s3Action :: Remote Annex -> a -> ((AWSConnection, String) -> Annex a) -> Annex a
s3Action r noconn action = do
when (config r == Nothing) $
error $ "Missing configuration for special remote " ++ name r
let bucket = M.lookup "bucket" $ fromJust $ config r
conn <- s3Connection (fromJust $ config r)
case (bucket, conn) of
(Just b, Just c) -> action (c, b)
_ -> return noconn
bucketKey :: String -> Key -> S3Object
bucketKey bucket k = S3Object bucket (show k) "" [] L.empty
|