root / src / Ganeti / Rpc.hs @ d99012a6
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{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, |
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BangPatterns, TemplateHaskell #-} |
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|
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{-| Implementation of the RPC client. |
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|
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-} |
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|
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{- |
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|
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Copyright (C) 2012, 2013 Google Inc. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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|
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-} |
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|
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module Ganeti.Rpc |
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( RpcCall |
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, Rpc |
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, RpcError(..) |
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, ERpcError |
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, explainRpcError |
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, executeRpcCall |
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, logRpcErrors |
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|
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, rpcCallName |
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, rpcCallTimeout |
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, rpcCallData |
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, rpcCallAcceptOffline |
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|
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, rpcResultFill |
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|
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, InstanceInfo(..) |
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, RpcCallInstanceInfo(..) |
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, RpcResultInstanceInfo(..) |
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|
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, RpcCallAllInstancesInfo(..) |
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, RpcResultAllInstancesInfo(..) |
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|
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, RpcCallInstanceList(..) |
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, RpcResultInstanceList(..) |
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|
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, HvInfo(..) |
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, StorageInfo(..) |
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, RpcCallNodeInfo(..) |
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, RpcResultNodeInfo(..) |
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|
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, RpcCallVersion(..) |
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, RpcResultVersion(..) |
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|
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, RpcCallStorageList(..) |
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, RpcResultStorageList(..) |
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|
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, RpcCallTestDelay(..) |
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, RpcResultTestDelay(..) |
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|
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, RpcCallExportList(..) |
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, RpcResultExportList(..) |
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) where |
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|
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import Control.Arrow (second) |
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import qualified Data.Map as Map |
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import Data.Maybe (fromMaybe) |
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import qualified Text.JSON as J |
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import Text.JSON.Pretty (pp_value) |
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|
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import Network.Curl |
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import qualified Ganeti.Path as P |
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|
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import Ganeti.BasicTypes |
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import qualified Ganeti.Constants as C |
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import Ganeti.Logging |
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import Ganeti.Objects |
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import Ganeti.THH |
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import Ganeti.Types |
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import Ganeti.Curl.Multi |
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import Ganeti.Utils |
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|
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-- * Base RPC functionality and types |
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|
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-- | The curl options used for RPC. |
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curlOpts :: [CurlOption] |
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curlOpts = [ CurlFollowLocation False |
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, CurlSSLVerifyHost 0 |
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, CurlSSLVerifyPeer True |
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, CurlSSLCertType "PEM" |
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, CurlSSLKeyType "PEM" |
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, CurlConnectTimeout (fromIntegral C.rpcConnectTimeout) |
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] |
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|
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-- | Data type for RPC error reporting. |
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data RpcError |
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= CurlLayerError String |
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| JsonDecodeError String |
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| RpcResultError String |
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| OfflineNodeError |
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deriving (Show, Eq) |
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|
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-- | Provide explanation to RPC errors. |
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explainRpcError :: RpcError -> String |
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explainRpcError (CurlLayerError code) = |
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"Curl error:" ++ code |
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explainRpcError (JsonDecodeError msg) = |
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"Error while decoding JSON from HTTP response: " ++ msg |
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explainRpcError (RpcResultError msg) = |
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"Error reponse received from RPC server: " ++ msg |
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explainRpcError OfflineNodeError = |
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"Node is marked offline" |
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|
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type ERpcError = Either RpcError |
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|
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-- | A generic class for RPC calls. |
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class (J.JSON a) => RpcCall a where |
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-- | Give the (Python) name of the procedure. |
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rpcCallName :: a -> String |
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-- | Calculate the timeout value for the call execution. |
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rpcCallTimeout :: a -> Int |
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-- | Prepare arguments of the call to be send as POST. |
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rpcCallData :: Node -> a -> String |
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-- | Whether we accept offline nodes when making a call. |
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rpcCallAcceptOffline :: a -> Bool |
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|
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-- | Generic class that ensures matching RPC call with its respective |
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-- result. |
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class (RpcCall a, J.JSON b) => Rpc a b | a -> b, b -> a where |
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-- | Create a result based on the received HTTP response. |
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rpcResultFill :: a -> J.JSValue -> ERpcError b |
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|
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-- | Http Request definition. |
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data HttpClientRequest = HttpClientRequest |
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{ requestUrl :: String -- ^ The actual URL for the node endpoint |
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, requestData :: String -- ^ The arguments for the call |
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, requestOpts :: [CurlOption] -- ^ The various curl options |
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} |
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|
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-- | Prepare url for the HTTP request. |
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prepareUrl :: (RpcCall a) => Node -> a -> String |
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prepareUrl node call = |
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let node_ip = nodePrimaryIp node |
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port = C.defaultNodedPort |
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path_prefix = "https://" ++ node_ip ++ ":" ++ show port |
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in path_prefix ++ "/" ++ rpcCallName call |
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|
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-- | Create HTTP request for a given node provided it is online, |
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-- otherwise create empty response. |
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prepareHttpRequest :: (RpcCall a) => [CurlOption] -> Node -> a |
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-> ERpcError HttpClientRequest |
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prepareHttpRequest opts node call |
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| rpcCallAcceptOffline call || not (nodeOffline node) = |
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Right HttpClientRequest { requestUrl = prepareUrl node call |
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, requestData = rpcCallData node call |
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, requestOpts = opts ++ curlOpts |
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} |
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| otherwise = Left OfflineNodeError |
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|
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-- | Parse an HTTP reply. |
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parseHttpReply :: (Rpc a b) => |
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a -> ERpcError (CurlCode, String) -> ERpcError b |
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parseHttpReply _ (Left e) = Left e |
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parseHttpReply call (Right (CurlOK, body)) = parseHttpResponse call body |
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parseHttpReply _ (Right (code, err)) = |
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Left . CurlLayerError $ "code: " ++ show code ++ ", explanation: " ++ err |
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|
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-- | Parse a result based on the received HTTP response. |
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parseHttpResponse :: (Rpc a b) => a -> String -> ERpcError b |
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parseHttpResponse call res = |
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case J.decode res of |
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J.Error val -> Left $ JsonDecodeError val |
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J.Ok (True, res'') -> rpcResultFill call res'' |
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J.Ok (False, jerr) -> case jerr of |
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J.JSString msg -> Left $ RpcResultError (J.fromJSString msg) |
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_ -> Left . JsonDecodeError $ show (pp_value jerr) |
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|
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-- | Scan the list of results produced by executeRpcCall and log all the RPC |
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-- errors. |
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logRpcErrors :: [(a, ERpcError b)] -> IO () |
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logRpcErrors allElems = |
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let logOneRpcErr (_, Right _) = return () |
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logOneRpcErr (_, Left err) = |
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logError $ "Error in the RPC HTTP reply: " ++ show err |
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in mapM_ logOneRpcErr allElems |
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|
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-- | Execute RPC call for many nodes in parallel. |
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executeRpcCall :: (Rpc a b) => [Node] -> a -> IO [(Node, ERpcError b)] |
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executeRpcCall nodes call = do |
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cert_file <- P.nodedCertFile |
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let opts = [ CurlTimeout (fromIntegral $ rpcCallTimeout call) |
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, CurlSSLCert cert_file |
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, CurlSSLKey cert_file |
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, CurlCAInfo cert_file |
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] |
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opts_urls = map (\n -> |
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case prepareHttpRequest opts n call of |
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Left v -> Left v |
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Right request -> |
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Right (CurlPostFields [requestData request]: |
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requestOpts request, |
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requestUrl request) |
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) nodes |
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-- split the opts_urls list; we don't want to pass the |
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-- failed-already nodes to Curl |
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let (lefts, rights, trail) = splitEithers opts_urls |
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results <- execMultiCall rights |
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results' <- case recombineEithers lefts results trail of |
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Bad msg -> error msg |
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Ok r -> return r |
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-- now parse the replies |
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let results'' = map (parseHttpReply call) results' |
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pairedList = zip nodes results'' |
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logRpcErrors pairedList |
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return pairedList |
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|
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-- | Helper function that is used to read dictionaries of values. |
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sanitizeDictResults :: [(String, J.Result a)] -> ERpcError [(String, a)] |
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sanitizeDictResults = |
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foldr sanitize1 (Right []) |
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where |
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sanitize1 _ (Left e) = Left e |
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sanitize1 (_, J.Error e) _ = Left $ JsonDecodeError e |
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sanitize1 (name, J.Ok v) (Right res) = Right $ (name, v) : res |
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|
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-- | Helper function to tranform JSON Result to Either RpcError b. |
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-- Note: For now we really only use it for b s.t. Rpc c b for some c |
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fromJResultToRes :: J.Result a -> (a -> b) -> ERpcError b |
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fromJResultToRes (J.Error v) _ = Left $ JsonDecodeError v |
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fromJResultToRes (J.Ok v) f = Right $ f v |
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|
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-- | Helper function transforming JSValue to Rpc result type. |
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fromJSValueToRes :: (J.JSON a) => J.JSValue -> (a -> b) -> ERpcError b |
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fromJSValueToRes val = fromJResultToRes (J.readJSON val) |
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|
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-- * RPC calls and results |
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|
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-- ** Instance info |
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|
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-- | InstanceInfo |
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-- Returns information about a single instance. |
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|
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$(buildObject "RpcCallInstanceInfo" "rpcCallInstInfo" |
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[ simpleField "instance" [t| String |] |
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, simpleField "hname" [t| Hypervisor |] |
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]) |
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|
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$(buildObject "InstanceInfo" "instInfo" |
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[ simpleField "memory" [t| Int|] |
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, simpleField "state" [t| String |] -- It depends on hypervisor :( |
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, simpleField "vcpus" [t| Int |] |
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, simpleField "time" [t| Int |] |
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]) |
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|
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-- This is optional here because the result may be empty if instance is |
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-- not on a node - and this is not considered an error. |
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$(buildObject "RpcResultInstanceInfo" "rpcResInstInfo" |
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[ optionalField $ simpleField "inst_info" [t| InstanceInfo |]]) |
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|
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instance RpcCall RpcCallInstanceInfo where |
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rpcCallName _ = "instance_info" |
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rpcCallTimeout _ = rpcTimeoutToRaw Urgent |
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rpcCallAcceptOffline _ = False |
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rpcCallData _ call = J.encode |
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( rpcCallInstInfoInstance call |
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, rpcCallInstInfoHname call |
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) |
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|
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instance Rpc RpcCallInstanceInfo RpcResultInstanceInfo where |
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rpcResultFill _ res = |
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case res of |
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J.JSObject res' -> |
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case J.fromJSObject res' of |
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[] -> Right $ RpcResultInstanceInfo Nothing |
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_ -> fromJSValueToRes res (RpcResultInstanceInfo . Just) |
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_ -> Left $ JsonDecodeError |
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("Expected JSObject, got " ++ show (pp_value res)) |
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|
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-- ** AllInstancesInfo |
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|
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-- | AllInstancesInfo |
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-- Returns information about all running instances on the given nodes |
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$(buildObject "RpcCallAllInstancesInfo" "rpcCallAllInstInfo" |
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[ simpleField "hypervisors" [t| [Hypervisor] |] ]) |
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|
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$(buildObject "RpcResultAllInstancesInfo" "rpcResAllInstInfo" |
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[ simpleField "instances" [t| [(String, InstanceInfo)] |] ]) |
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|
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instance RpcCall RpcCallAllInstancesInfo where |
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rpcCallName _ = "all_instances_info" |
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rpcCallTimeout _ = rpcTimeoutToRaw Urgent |
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rpcCallAcceptOffline _ = False |
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rpcCallData _ call = J.encode [rpcCallAllInstInfoHypervisors call] |
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|
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instance Rpc RpcCallAllInstancesInfo RpcResultAllInstancesInfo where |
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-- FIXME: Is there a simpler way to do it? |
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rpcResultFill _ res = |
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case res of |
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J.JSObject res' -> |
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let res'' = map (second J.readJSON) (J.fromJSObject res') |
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:: [(String, J.Result InstanceInfo)] in |
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case sanitizeDictResults res'' of |
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Left err -> Left err |
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Right insts -> Right $ RpcResultAllInstancesInfo insts |
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_ -> Left $ JsonDecodeError |
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("Expected JSObject, got " ++ show (pp_value res)) |
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|
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-- ** InstanceList |
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|
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-- | InstanceList |
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-- Returns the list of running instances on the given nodes. |
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$(buildObject "RpcCallInstanceList" "rpcCallInstList" |
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[ simpleField "hypervisors" [t| [Hypervisor] |] ]) |
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|
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$(buildObject "RpcResultInstanceList" "rpcResInstList" |
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[ simpleField "instances" [t| [String] |] ]) |
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|
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instance RpcCall RpcCallInstanceList where |
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rpcCallName _ = "instance_list" |
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rpcCallTimeout _ = rpcTimeoutToRaw Urgent |
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rpcCallAcceptOffline _ = False |
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rpcCallData _ call = J.encode [rpcCallInstListHypervisors call] |
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|
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instance Rpc RpcCallInstanceList RpcResultInstanceList where |
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rpcResultFill _ res = fromJSValueToRes res RpcResultInstanceList |
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|
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-- ** NodeInfo |
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|
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-- | NodeInfo |
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-- Return node information. |
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$(buildObject "RpcCallNodeInfo" "rpcCallNodeInfo" |
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[ simpleField "storage_units" [t| Map.Map String [StorageUnit] |] |
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, simpleField "hypervisors" [t| [ (Hypervisor, HvParams) ] |] |
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]) |
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|
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$(buildObject "StorageInfo" "storageInfo" |
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[ simpleField "name" [t| String |] |
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, simpleField "type" [t| String |] |
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, optionalField $ simpleField "storage_free" [t| Int |] |
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, optionalField $ simpleField "storage_size" [t| Int |] |
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]) |
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|
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-- | We only provide common fields as described in hv_base.py. |
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$(buildObject "HvInfo" "hvInfo" |
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[ simpleField "memory_total" [t| Int |] |
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, simpleField "memory_free" [t| Int |] |
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, simpleField "memory_dom0" [t| Int |] |
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, simpleField "cpu_total" [t| Int |] |
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, simpleField "cpu_nodes" [t| Int |] |
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, simpleField "cpu_sockets" [t| Int |] |
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, simpleField "cpu_dom0" [t| Int |] |
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]) |
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|
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$(buildObject "RpcResultNodeInfo" "rpcResNodeInfo" |
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[ simpleField "boot_id" [t| String |] |
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, simpleField "storage_info" [t| [StorageInfo] |] |
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, simpleField "hv_info" [t| [HvInfo] |] |
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]) |
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|
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instance RpcCall RpcCallNodeInfo where |
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rpcCallName _ = "node_info" |
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rpcCallTimeout _ = rpcTimeoutToRaw Urgent |
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rpcCallAcceptOffline _ = False |
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rpcCallData n call = J.encode |
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( fromMaybe (error $ "Programmer error: missing parameter for node named " |
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++ nodeName n) |
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$ Map.lookup (nodeUuid n) (rpcCallNodeInfoStorageUnits call) |
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, rpcCallNodeInfoHypervisors call |
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) |
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|
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instance Rpc RpcCallNodeInfo RpcResultNodeInfo where |
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rpcResultFill _ res = |
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fromJSValueToRes res (\(b, vg, hv) -> RpcResultNodeInfo b vg hv) |
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|
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-- ** Version |
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|
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-- | Query node version. |
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$(buildObject "RpcCallVersion" "rpcCallVersion" []) |
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|
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-- | Query node reply. |
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$(buildObject "RpcResultVersion" "rpcResultVersion" |
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[ simpleField "version" [t| Int |] |
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]) |
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|
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instance RpcCall RpcCallVersion where |
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rpcCallName _ = "version" |
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rpcCallTimeout _ = rpcTimeoutToRaw Urgent |
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rpcCallAcceptOffline _ = True |
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rpcCallData _ = J.encode |
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|
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instance Rpc RpcCallVersion RpcResultVersion where |
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rpcResultFill _ res = fromJSValueToRes res RpcResultVersion |
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|
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-- ** StorageList |
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|
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$(buildObject "RpcCallStorageList" "rpcCallStorageList" |
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[ simpleField "su_name" [t| StorageType |] |
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, simpleField "su_args" [t| [String] |] |
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, simpleField "name" [t| String |] |
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, simpleField "fields" [t| [StorageField] |] |
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]) |
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|
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-- FIXME: The resulting JSValues should have types appropriate for their |
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-- StorageField value: Used -> Bool, Name -> String etc |
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$(buildObject "RpcResultStorageList" "rpcResStorageList" |
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[ simpleField "storage" [t| [[(StorageField, J.JSValue)]] |] ]) |
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|
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instance RpcCall RpcCallStorageList where |
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rpcCallName _ = "storage_list" |
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rpcCallTimeout _ = rpcTimeoutToRaw Normal |
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rpcCallAcceptOffline _ = False |
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rpcCallData _ call = J.encode |
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( rpcCallStorageListSuName call |
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, rpcCallStorageListSuArgs call |
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, rpcCallStorageListName call |
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, rpcCallStorageListFields call |
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) |
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|
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instance Rpc RpcCallStorageList RpcResultStorageList where |
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rpcResultFill call res = |
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let sfields = rpcCallStorageListFields call in |
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fromJSValueToRes res (RpcResultStorageList . map (zip sfields)) |
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|
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-- ** TestDelay |
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|
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-- | Call definition for test delay. |
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$(buildObject "RpcCallTestDelay" "rpcCallTestDelay" |
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[ simpleField "duration" [t| Double |] |
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]) |
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|
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-- | Result definition for test delay. |
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data RpcResultTestDelay = RpcResultTestDelay |
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deriving Show |
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|
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-- | Custom JSON instance for null result. |
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instance J.JSON RpcResultTestDelay where |
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showJSON _ = J.JSNull |
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readJSON J.JSNull = return RpcResultTestDelay |
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readJSON _ = fail "Unable to read RpcResultTestDelay" |
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|
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instance RpcCall RpcCallTestDelay where |
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rpcCallName _ = "test_delay" |
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rpcCallTimeout = ceiling . (+ 5) . rpcCallTestDelayDuration |
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rpcCallAcceptOffline _ = False |
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rpcCallData _ call = J.encode [rpcCallTestDelayDuration call] |
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|
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instance Rpc RpcCallTestDelay RpcResultTestDelay where |
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rpcResultFill _ res = fromJSValueToRes res id |
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|
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-- ** ExportList |
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|
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-- | Call definition for export list. |
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|
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$(buildObject "RpcCallExportList" "rpcCallExportList" []) |
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|
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-- | Result definition for export list. |
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$(buildObject "RpcResultExportList" "rpcResExportList" |
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[ simpleField "exports" [t| [String] |] |
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]) |
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|
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instance RpcCall RpcCallExportList where |
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rpcCallName _ = "export_list" |
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rpcCallTimeout _ = rpcTimeoutToRaw Fast |
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rpcCallAcceptOffline _ = False |
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rpcCallData _ = J.encode |
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|
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instance Rpc RpcCallExportList RpcResultExportList where |
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rpcResultFill _ res = fromJSValueToRes res RpcResultExportList |