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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
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 RemoteClass
import Types
import qualified GitRepo as Git
import qualified Annex
import UUID
import Messages
import Locations
import Remote.Special
remote :: RemoteType Annex
remote = RemoteType {
typename = "S3",
enumerate = findSpecialRemotes "s3",
generate = gen,
setup = s3Setup
}
gen :: Git.Repo -> UUID -> Cost -> Maybe (M.Map String String) -> Annex (Remote Annex)
gen r u cst c = return 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
}
s3Connection :: M.Map String String -> IO AWSConnection
s3Connection c = do
ak <- getEnvKey "AWS_ACCESS_KEY_ID"
sk <- getEnvKey "AWS_SECRET_ACCESS_KEY"
return $ 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 = catch (getEnv s) (error $ "Set " ++ s)
s3Setup :: UUID -> M.Map String String -> Annex (M.Map String String)
s3Setup u c = do
-- verify configuration is sane
case M.lookup "encryption" c of
Nothing -> error "Specify encryption=key or encryption=none"
Just "none" -> return ()
Just _ -> error "encryption keys not yet supported"
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 <- liftIO $ s3Connection fullconfig
showNote "checking bucket"
loc <- liftIO $ getBucketLocation conn bucket
case loc of
Right _ -> return ()
Left err@(NetworkError _) -> error $ prettyReqError err
Left (AWSError _ _) -> do
showNote $ "creating bucket in " ++ datacenter
res <- liftIO $ createBucketIn conn bucket datacenter
case res of
Right _ -> return ()
Left err -> error $ prettyReqError err
gitConfigSpecialRemote "s3" u fullconfig
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)
]
s3Action :: Remote Annex -> ((AWSConnection, String) -> Annex a) -> Annex a
s3Action r a = do
when (config r == Nothing) $
error $ "Missing configuration for special remote " ++ name r
conn <- liftIO $ s3Connection (fromJust $ config r)
let bucket = fromJust $ M.lookup "bucket" $ fromJust $ config r
a (conn, bucket)
bucketKey :: String -> Key -> L.ByteString -> S3Object
bucketKey bucket k content = S3Object bucket (show k) "" [] content
checkPresent :: Remote Annex -> Key -> Annex (Either IOException Bool)
checkPresent r k = s3Action r $ \(conn, bucket) -> do
showNote ("checking " ++ name r ++ "...")
res <- liftIO $ getObjectInfo conn $ bucketKey bucket k L.empty
case res of
Right _ -> return $ Right True
Left (AWSError _ _) -> return $ Right False
Left e -> return $ Left (error $ prettyReqError e)
store :: Remote Annex -> Key -> Annex Bool
store r k = s3Action r $ \(conn, bucket) -> do
g <- Annex.gitRepo
content <- liftIO $ L.readFile $ gitAnnexLocation g k
let object = setStorageClass storageclass $ bucketKey bucket k content
res <- liftIO $ sendObject conn object
case res of
Right _ -> return True
Left e -> do
warning $ prettyReqError e
return False
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 $ \(conn, bucket) -> do
res <- liftIO $ getObject conn $ bucketKey bucket k L.empty
case res of
Right o -> do
liftIO $ L.writeFile f (obj_data o)
return True
Left e -> do
warning $ prettyReqError e
return False
remove :: Remote Annex -> Key -> Annex Bool
remove r k = s3Action r $ \(conn, bucket) -> do
res <- liftIO $ deleteObject conn $ bucketKey bucket k L.empty
case res of
Right _ -> return True
Left e -> do
warning $ prettyReqError e
return False
|
