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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 Config
import Remote.Special
remote :: RemoteType Annex
remote = RemoteType {
typename = "S3",
enumerate = findSpecialRemotes "s3",
generate = gen,
setup = s3Setup
}
gen :: Git.Repo -> UUID -> Maybe (M.Map String String) -> Annex (Remote Annex)
gen r u c = do
cst <- remoteCost r expensiveRemoteCost
return $ this cst
where
this cst = Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = store (this cst),
retrieveKeyFile = retrieve (this cst),
removeKey = remove (this cst),
hasKey = checkPresent (this cst),
hasKeyCheap = False,
config = c
}
s3ConnectionRequired :: M.Map String String -> Annex AWSConnection
s3ConnectionRequired c = do
conn <- s3Connection c
case conn of
Nothing -> error "Cannot connect to S3"
Just conn' -> return conn'
s3Connection :: M.Map String String -> 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 "")
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 <- s3ConnectionRequired 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 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)
]
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 -> 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 noconn $ \(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)
where
noconn = Left $ error "S3 not configured"
store :: Remote Annex -> Key -> Annex Bool
store r k = s3Action r False $ \(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 False $ \(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 False $ \(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
|
