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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 Data.String.Utils
import Control.Monad (filterM, when)
import Control.Monad.State (liftIO)
import System.Environment
import RemoteClass
import Types
import qualified GitRepo as Git
import qualified Annex
import UUID
import Config
import Utility
import Messages
remote :: RemoteType Annex
remote = RemoteType {
typename = "S3",
generator = gen,
setup = s3Setup
}
gen :: Annex [Remote Annex]
gen = do
g <- Annex.gitRepo
l <- filterM remoteNotIgnored $ findS3Remotes g
generated <- mapM genRemote l
return $ catMaybes generated
{- S3 remotes have a remote.<name>.annex-s3 config setting.
- Git.Repo does not normally generate remotes for things that
- have no configured url, so the Git.Repo objects have to be
- constructed as coming from an unknown location. -}
findS3Remotes :: Git.Repo -> [Git.Repo]
findS3Remotes r = map construct remotepairs
where
remotepairs = M.toList $ filterremotes $ Git.configMap r
filterremotes = M.filterWithKey (\k _ -> s3remote k)
construct (k,_) = Git.repoRemoteNameSet Git.repoFromUnknown k
s3remote k = startswith "remote." k && endswith ".annex-s3" k
genRemote :: Git.Repo -> Annex (Maybe (Remote Annex))
genRemote r = do
u <- getUUID r
if (u == "")
then return Nothing
else do
c <- remoteCost r
return $ Just $ newremote u c
where
newremote u c = this
where
this = Remote {
uuid = u,
cost = c,
name = Git.repoDescribe r,
storeKey = s3Store this,
retrieveKeyFile = error "TODO retrievekey",
removeKey = error "TODO removekey",
hasKey = s3CheckPresent this,
hasKeyCheap = False,
config = Nothing
}
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
g <- Annex.gitRepo
liftIO $ do
Git.run g "config" [Param (configsetting "annex-s3"), Param "true"]
Git.run g "config" [Param (configsetting "annex-uuid"), Param u]
return fullconfig
where
remotename = fromJust (M.lookup "name" c)
bucket = remotename ++ "-" ++ u
configsetting s = "remote." ++ remotename ++ "." ++ s
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)
s3File :: Key -> FilePath
s3File k = show k
s3CheckPresent :: Remote Annex -> Key -> Annex (Either IOException Bool)
s3CheckPresent r k = s3Action r $ \(conn, bucket) -> do
let object = S3Object bucket (s3File k) "" [] L.empty
showNote ("checking " ++ name r ++ "...")
res <- liftIO $ getObjectInfo conn object
case res of
Right _ -> return $ Right True
Left (AWSError _ _) -> return $ Right False
Left e -> return $ Left (error $ prettyReqError e)
s3Store :: Remote Annex -> Key -> Annex Bool
s3Store r k = s3Action r $ \(conn, bucket) -> do
let object = setStorageClass storageclass $
S3Object bucket (s3File k) "" [] (error "read content here")
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
|
