module NmcDom ( NmcDom(..)
, emptyNmcDom
- , descendNmc
+ , seedNmcDom
+ , descendNmcDom
) where
+import Prelude hiding (length)
import Data.ByteString.Lazy (ByteString)
-import Data.Text as T (unpack)
+import qualified Data.Text as T (unpack)
+import Data.List as L (union)
import Data.List.Split
import Data.Char
-import Data.Map as M (Map, lookup)
+import Data.Map as M (Map, lookup, delete, size, union)
+import Data.Vector (toList,(!),length)
import Control.Applicative ((<$>), (<*>), empty)
import Data.Aeson
-data NmcRRService = NmcRRService -- unused
+class Mergeable a where
+ merge :: a -> a -> a -- bias towads second arg
+
+instance Ord k => Mergeable (Map k a) where
+ merge mx my = M.union my mx
+
+-- instance Mergeable String where
+-- merge _ b = b
+
+instance Mergeable Value where
+ merge _ b = b
+
+instance Mergeable a => Mergeable (Maybe a) where
+ merge (Just x) (Just y) = Just (merge x y)
+ merge Nothing (Just y) = Just y
+ merge (Just x) Nothing = Just x
+ merge Nothing Nothing = Nothing
+
+instance Eq a => Mergeable [a] where
+ merge xs ys = L.union xs ys
+
+data NmcRRService = NmcRRService
{ srvName :: String
, srvProto :: String
, srvW1 :: Int
, srvW2 :: Int
, srvPort :: Int
- , srvHost :: [String]
+ , srvHost :: String
} deriving (Show, Eq)
instance FromJSON NmcRRService where
- parseJSON (Object o) = NmcRRService
- <$> o .: "name"
- <*> o .: "proto"
- <*> o .: "w1"
- <*> o .: "w2"
- <*> o .: "port"
- <*> o .: "host"
+ parseJSON (Array a) =
+ if length a == 6 then NmcRRService
+ <$> parseJSON (a ! 0)
+ <*> parseJSON (a ! 1)
+ <*> parseJSON (a ! 2)
+ <*> parseJSON (a ! 3)
+ <*> parseJSON (a ! 4)
+ <*> parseJSON (a ! 5)
+ else empty
parseJSON _ = empty
+instance Mergeable NmcRRService where
+ merge _ b = b
+
data NmcRRI2p = NmcRRI2p
{ i2pDestination :: String
, i2pName :: String
<*> o .: "b32"
parseJSON _ = empty
-data NmcDom = NmcDom { domService :: Maybe [[String]] -- [NmcRRService]
+instance Mergeable NmcRRI2p where
+ merge _ b = b
+
+data NmcDom = NmcDom { domService :: Maybe [NmcRRService]
, domIp :: Maybe [String]
, domIp6 :: Maybe [String]
, domTor :: Maybe String
, domInfo :: Maybe Value
, domNs :: Maybe [String]
, domDelegate :: Maybe [String]
- , domImport :: Maybe [[String]]
+ , domImport :: Maybe String
, domMap :: Maybe (Map String NmcDom)
, domFingerprint :: Maybe [String]
, domTls :: Maybe (Map String
<*> o .:? "ds"
parseJSON _ = empty
+instance Mergeable NmcDom where
+ merge sub dom = dom { domService = mergelm domService
+ , domIp = mergelm domIp
+ , domIp6 = mergelm domIp6
+ , domTor = choose domTor
+ , domI2p = mergelm domI2p
+ , domFreenet = choose domFreenet
+ , domAlias = choose domAlias
+ , domTranslate = choose domTranslate
+ , domEmail = choose domEmail
+ , domLoc = choose domLoc
+ , domInfo = mergelm domInfo
+ , domNs = mergelm domNs
+ , domDelegate = mergelm domDelegate
+ , domImport = choose domImport
+ , domMap = mergelm domMap
+ , domFingerprint = mergelm domFingerprint
+ , domTls = mergelm domTls
+ , domDs = mergelm domDs
+ }
+ where
+ mergelm x = merge (x sub) (x dom)
+-- Because it is not possible to define instance of merge for Strings,
+-- we have to treat string elements separately, otherwise strings are
+-- 'unioned' along with the rest of lists. Ugly, but alternatives are worse.
+ choose field = case field dom of
+ Nothing -> field sub
+ Just x -> Just x
+
+
emptyNmcDom = NmcDom Nothing Nothing Nothing Nothing Nothing Nothing
Nothing Nothing Nothing Nothing Nothing Nothing
Nothing Nothing Nothing Nothing Nothing Nothing
+-- | Perform query and return error string or parsed domain object
+queryNmcDom ::
+ (String -> IO (Either String ByteString)) -- ^ query operation action
+ -> String -- ^ key
+ -> IO (Either String NmcDom) -- ^ error string or domain
+queryNmcDom queryOp key = do
+ l <- queryOp key
+ case l of
+ Left estr -> return $ Left estr
+ Right str -> case decode str :: Maybe NmcDom of
+ Nothing -> return $ Left $ "Unparseable value: " ++ (show str)
+ Just dom -> return $ Right dom
+
+-- | Try to fetch "import" object and merge it into the base domain
+-- Original "import" element is removed, but new imports from the
+-- imported objects are processed recursively until there are none.
+mergeImport ::
+ (String -> IO (Either String ByteString)) -- ^ query operation action
+ -> NmcDom -- ^ base domain
+ -> IO (Either String NmcDom) -- ^ result with merged import
+mergeImport queryOp base = do
+ let
+ mbase = mergeSelf base
+ base' = mbase {domImport = Nothing}
+ -- print base
+ case domImport mbase of
+ Nothing -> return $ Right base'
+ Just key -> do
+ sub <- queryNmcDom queryOp key
+ case sub of
+ Left e -> return $ Left e
+ Right sub' -> mergeImport queryOp $ sub' `merge` base'
+
+-- | If there is an element in the map with key "", merge the contents
+-- and remove this element. Do this recursively.
+mergeSelf :: NmcDom -> NmcDom
+mergeSelf base =
+ let
+ map = domMap base
+ base' = base {domMap = removeSelf map}
+ removeSelf Nothing = Nothing
+ removeSelf (Just map) = if size map' == 0 then Nothing else Just map'
+ where map' = M.delete "" map
+ in
+ case map of
+ Nothing -> base'
+ Just map' ->
+ case M.lookup "" map' of
+ Nothing -> base'
+ Just sub -> (mergeSelf sub) `merge` base'
+
+-- | Presence of some elements require removal of some others
normalizeDom :: NmcDom -> NmcDom
-normalizeDom dom
- | domNs dom /= Nothing = emptyNmcDom { domNs = domNs dom
- , domEmail = domEmail dom
- }
- | domDelegate dom /= Nothing = emptyNmcDom -- FIXME
- | domTranslate dom /= Nothing = dom { domMap = Nothing }
- | otherwise = dom
-
-descendNmc :: [String] -> NmcDom -> NmcDom
-descendNmc subdom rawdom =
- let dom = normalizeDom rawdom
- in case subdom of
- [] ->
- case domMap dom of
- Nothing -> dom
- Just map ->
- case M.lookup "" map of -- Stupid, but there are "" in the map
- Nothing -> dom -- Try to merge it with the root data
- Just sub -> mergeNmc sub dom -- Or maybe drop it altogether...
- d:ds ->
- case domMap dom of
- Nothing -> emptyNmcDom
- Just map ->
- case M.lookup d map of
- Nothing -> emptyNmcDom
- Just sub -> descendNmc ds sub
-
--- FIXME -- I hope there exists a better way to merge records!
-mergeNmc :: NmcDom -> NmcDom -> NmcDom
-mergeNmc sub dom = dom { domService = choose domService
- , domIp = choose domIp
- , domIp6 = choose domIp6
- , domTor = choose domTor
- , domI2p = choose domI2p
- , domFreenet = choose domFreenet
- , domAlias = choose domAlias
- , domTranslate = choose domTranslate
- , domEmail = choose domEmail
- , domLoc = choose domLoc
- , domInfo = choose domInfo
- , domNs = choose domNs
- , domDelegate = choose domDelegate
- , domImport = choose domImport
- , domFingerprint = choose domFingerprint
- , domTls = choose domTls
- , domDs = choose domDs
- }
+normalizeDom dom = foldr id dom [ translateNormalizer
+ -- , nsNormalizer -- FIXME retrun this
+ ]
where
- choose :: (NmcDom -> Maybe a) -> Maybe a
- choose field = case field dom of
- Nothing -> field sub
- Just x -> Just x
+ nsNormalizer dom = case domNs dom of
+ Nothing -> dom
+ Just ns -> emptyNmcDom { domNs = domNs dom, domEmail = domEmail dom }
+ translateNormalizer dom = case domTranslate dom of
+ Nothing -> dom
+ Just tr -> dom { domMap = Nothing }
+
+-- | Merge imports and Selfs and follow the maps tree to get dom
+descendNmcDom ::
+ (String -> IO (Either String ByteString)) -- ^ query operation action
+ -> [String] -- ^ subdomain chain
+ -> NmcDom -- ^ base domain
+ -> IO (Either String NmcDom) -- ^ fully processed result
+descendNmcDom queryOp subdom base = do
+ base' <- mergeImport queryOp base
+ case subdom of
+ [] -> return $ fmap normalizeDom base'
+ d:ds ->
+ case base' of
+ Left err -> return base'
+ Right base'' ->
+ case domMap base'' of
+ Nothing -> return $ Right emptyNmcDom
+ Just map ->
+ case M.lookup d map of
+ Nothing -> return $ Right emptyNmcDom
+ Just sub -> descendNmcDom queryOp ds sub
+
+-- | Initial NmcDom populated with "import" only, suitable for "descend"
+seedNmcDom ::
+ String -- ^ domain key (without namespace prefix)
+ -> NmcDom -- ^ resulting seed domain
+seedNmcDom dn = emptyNmcDom { domImport = Just ("d/" ++ dn)}
projects / pdns-pipe-nmc.git / blobdiff