X-Git-Url: http://www.average.org/gitweb/?p=pdns-pipe-nmc.git;a=blobdiff_plain;f=Data%2FJsonRpcClient.hs;fp=Data%2FJsonRpcClient.hs;h=cf23d54a2046bdc3ca62c65bf8254e3dcc77ae5b;hp=0000000000000000000000000000000000000000;hb=5814aa33eb4b29fbfb95333d8dcbaf991e6d0d10;hpb=a0ac4a88c7f48dac8e4a79d1b7ac17a19057d662

diff --git a/Data/JsonRpcClient.hs b/Data/JsonRpcClient.hs
new file mode 100644
index 0000000..cf23d54
--- /dev/null
+++ b/Data/JsonRpcClient.hs
@@ -0,0 +1,83 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module JsonRpcClient
+                ( JsonRpcVersion(JsonRpcV1, JsonRpcV2)
+                , JsonRpcRequest
+                , JsonRpcNotification
+                , JsonRpcError(..)
+                , parseJsonRpc
+                ) where
+
+import Data.ByteString.Lazy (ByteString)
+import Control.Applicative ((<$>), (<*>), empty)
+import Data.Either
+import Data.Aeson
+
+data JsonRpcVersion = JsonRpcV1 | JsonRpcV2
+        deriving (Show)
+
+data JsonRpcRequest = JsonRpcRequest { jrpcVersion    :: JsonRpcVersion
+                                     , jrpcReqMethod  :: ByteString
+                                     , jrpcReqParams  :: [ByteString]
+                                     , jrpcReqId      :: Value
+                                     } deriving (Show)
+instance ToJSON JsonRpcRequest where
+  toJSON (JsonRpcRequest version method params id) =
+    let l = [ "method" .= method, "params" .= params, "id" .= id ]
+    in case version of
+      JsonRpcV1 -> object l
+      JsonRpcV2 -> object $ ("jsonrpc" .= toJSON ("2.0" :: ByteString)):l
+
+data JsonRpcNotification = JsonRpcNotification
+                                     { jrpcNtfVersion :: JsonRpcVersion
+                                     , jrpcNtfMethod  :: ByteString
+                                     , jrpcNtfParams  :: [ByteString]
+                                     } deriving (Show)
+instance ToJSON JsonRpcNotification where
+  toJSON (JsonRpcNotification version method params) =
+    let l = [ "method" .= method, "params" .= params ]
+    in case version of
+      JsonRpcV1 -> object l
+      JsonRpcV2 -> object $ ("jsonrpc" .= toJSON ("2.0" :: ByteString)):l
+
+data JsonRpcError = JsonRpcError { jrpcErrCode    :: Int
+                                 , jrpcErrMessage :: ByteString
+                                 , jrpcErrData    :: Maybe Value
+                                 } deriving (Show)
+instance FromJSON JsonRpcError where
+  parseJSON (Object o) = JsonRpcError
+                                <$> o .: "code"
+                                <*> o .: "error"
+                                <*> o .: "data"
+  parseJSON x = return $ JsonRpcError
+                                (-32600)
+                                "Unparseable error object"
+                                (Just (toJSON x))
+
+data JsonRpcResponse = JsonRpcResponse { jrpcRspResult :: Maybe Value
+                                       , jrpcRspError  :: JsonRpcError
+                                       , jrpcRspId     :: Value
+                                       } deriving (Show)
+instance FromJSON JsonRpcResponse where
+  parseJSON (Object o) = JsonRpcResponse
+                                <$> o .: "result"
+                                <*> o .: "error"
+                                <*> o .: "id"
+  parseJSON x = return $ JsonRpcResponse
+                                Nothing
+                                (JsonRpcError
+                                        (-32700)
+                                        "Unparseable response object"
+                                        (Just (toJSON x))
+                                )
+                                (String "n/a")
+
+parseJsonRpc :: (FromJSON a) => ByteString -> Either JsonRpcError a
+parseJsonRpc s = case (decode s :: Maybe JsonRpcResponse) of
+  Just (JsonRpcResponse result error id) ->
+    case result of
+      Just v -> case fromJSON v of
+        Success a -> Right a
+        Error s   -> Left $ JsonRpcError (-32900) "Unparseable result" (Just v)
+      Nothing -> Left error
+  Nothing -> Left $ JsonRpcError (-32800) "Unparseable response" (Just (toJSON s))