1 {-# LANGUAGE BangPatterns #-}
3 {-| Implementation of the Ganeti Query2 server.
9 Copyright (C) 2012, 2013 Google Inc.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
28 module Ganeti.Query.Server
34 import Control.Applicative
35 import Control.Concurrent
36 import Control.Exception
37 import Data.Bits (bitSize)
39 import qualified Network.Socket as S
40 import qualified Text.JSON as J
41 import Text.JSON (showJSON, JSValue(..))
42 import System.Info (arch)
44 import qualified Ganeti.Constants as C
46 import qualified Ganeti.Path as Path
49 import qualified Ganeti.Config as Config
50 import Ganeti.BasicTypes
53 import Ganeti.OpCodes (TagObject(..))
54 import qualified Ganeti.Query.Language as Qlang
55 import Ganeti.Query.Query
56 import Ganeti.Query.Filter (makeSimpleFilter)
58 -- | A type for functions that can return the configuration when
60 type ConfigReader = IO (Result ConfigData)
62 -- | Helper for classic queries.
63 handleClassicQuery :: ConfigData -- ^ Cluster config
64 -> Qlang.ItemType -- ^ Query type
65 -> [Either String Integer] -- ^ Requested names
67 -> [String] -- ^ Requested fields
68 -> Bool -- ^ Whether to do sync queries or not
69 -> IO (GenericResult GanetiException JSValue)
70 handleClassicQuery _ _ _ _ True =
71 return . Bad $ OpPrereqError "Sync queries are not allowed" ECodeInval
72 handleClassicQuery cfg qkind names fields _ = do
73 let flt = makeSimpleFilter (nameField qkind) names
74 qr <- query cfg True (Qlang.Query qkind fields flt)
75 return $ showJSON <$> (qr >>= queryCompat)
77 -- | Minimal wrapper to handle the missing config case.
78 handleCallWrapper :: Result ConfigData -> LuxiOp -> IO (ErrorResult JSValue)
79 handleCallWrapper (Bad msg) _ =
80 return . Bad . ConfigurationError $
81 "I do not have access to a valid configuration, cannot\
82 \ process queries: " ++ msg
83 handleCallWrapper (Ok config) op = handleCall config op
85 -- | Actual luxi operation handler.
86 handleCall :: ConfigData -> LuxiOp -> IO (ErrorResult JSValue)
87 handleCall cdata QueryClusterInfo =
88 let cluster = configCluster cdata
89 hypervisors = clusterEnabledHypervisors cluster
90 def_hv = case hypervisors of
93 bits = show (bitSize (0::Int)) ++ "bits"
94 arch_tuple = [bits, arch]
95 obj = [ ("software_version", showJSON C.releaseVersion)
96 , ("protocol_version", showJSON C.protocolVersion)
97 , ("config_version", showJSON C.configVersion)
98 , ("os_api_version", showJSON $ maximum C.osApiVersions)
99 , ("export_version", showJSON C.exportVersion)
100 , ("architecture", showJSON arch_tuple)
101 , ("name", showJSON $ clusterClusterName cluster)
102 , ("master", showJSON $ clusterMasterNode cluster)
103 , ("default_hypervisor", def_hv)
104 , ("enabled_hypervisors", showJSON hypervisors)
105 , ("hvparams", showJSON $ clusterHvparams cluster)
106 , ("os_hvp", showJSON $ clusterOsHvp cluster)
107 , ("beparams", showJSON $ clusterBeparams cluster)
108 , ("osparams", showJSON $ clusterOsparams cluster)
109 , ("ipolicy", showJSON $ clusterIpolicy cluster)
110 , ("nicparams", showJSON $ clusterNicparams cluster)
111 , ("ndparams", showJSON $ clusterNdparams cluster)
112 , ("diskparams", showJSON $ clusterDiskparams cluster)
113 , ("candidate_pool_size",
114 showJSON $ clusterCandidatePoolSize cluster)
115 , ("master_netdev", showJSON $ clusterMasterNetdev cluster)
116 , ("master_netmask", showJSON $ clusterMasterNetmask cluster)
117 , ("use_external_mip_script",
118 showJSON $ clusterUseExternalMipScript cluster)
119 , ("volume_group_name",
120 maybe JSNull showJSON (clusterVolumeGroupName cluster))
121 , ("drbd_usermode_helper",
122 maybe JSNull showJSON (clusterDrbdUsermodeHelper cluster))
123 , ("file_storage_dir", showJSON $ clusterFileStorageDir cluster)
124 , ("shared_file_storage_dir",
125 showJSON $ clusterSharedFileStorageDir cluster)
126 , ("maintain_node_health",
127 showJSON $ clusterMaintainNodeHealth cluster)
128 , ("ctime", showJSON $ clusterCtime cluster)
129 , ("mtime", showJSON $ clusterMtime cluster)
130 , ("uuid", showJSON $ clusterUuid cluster)
131 , ("tags", showJSON $ clusterTags cluster)
132 , ("uid_pool", showJSON $ clusterUidPool cluster)
133 , ("default_iallocator",
134 showJSON $ clusterDefaultIallocator cluster)
135 , ("reserved_lvs", showJSON $ clusterReservedLvs cluster)
136 , ("primary_ip_version",
137 showJSON . ipFamilyToVersion $ clusterPrimaryIpFamily cluster)
138 , ("prealloc_wipe_disks",
139 showJSON $ clusterPreallocWipeDisks cluster)
140 , ("hidden_os", showJSON $ clusterHiddenOs cluster)
141 , ("blacklisted_os", showJSON $ clusterBlacklistedOs cluster)
144 in return . Ok . J.makeObj $ obj
146 handleCall cfg (QueryTags kind) =
147 let tags = case kind of
148 TagCluster -> Ok . clusterTags $ configCluster cfg
149 TagGroup name -> groupTags <$> Config.getGroup cfg name
150 TagNode name -> nodeTags <$> Config.getNode cfg name
151 TagInstance name -> instTags <$> Config.getInstance cfg name
152 in return (J.showJSON <$> tags)
154 handleCall cfg (Query qkind qfields qfilter) = do
155 result <- query cfg True (Qlang.Query qkind qfields qfilter)
156 return $ J.showJSON <$> result
158 handleCall _ (QueryFields qkind qfields) = do
159 let result = queryFields (Qlang.QueryFields qkind qfields)
160 return $ J.showJSON <$> result
162 handleCall cfg (QueryNodes names fields lock) =
163 handleClassicQuery cfg (Qlang.ItemTypeOpCode Qlang.QRNode)
164 (map Left names) fields lock
166 handleCall cfg (QueryGroups names fields lock) =
167 handleClassicQuery cfg (Qlang.ItemTypeOpCode Qlang.QRGroup)
168 (map Left names) fields lock
170 handleCall cfg (QueryJobs names fields) =
171 handleClassicQuery cfg (Qlang.ItemTypeLuxi Qlang.QRJob)
172 (map (Right . fromIntegral . fromJobId) names) fields False
176 GenericError ("Luxi call '" ++ strOfOp op ++ "' not implemented")
179 -- | Given a decoded luxi request, executes it and sends the luxi
180 -- response back to the client.
181 handleClientMsg :: Client -> ConfigReader -> LuxiOp -> IO Bool
182 handleClientMsg client creader args = do
184 logDebug $ "Request: " ++ show args
185 call_result <- handleCallWrapper cfg args
189 logWarning $ "Failed to execute request: " ++ show err
190 return (False, showJSON err)
192 -- only log the first 2,000 chars of the result
193 logDebug $ "Result (truncated): " ++ take 2000 (J.encode result)
194 return (True, result)
195 sendMsg client $ buildResponse status rval
198 -- | Handles one iteration of the client protocol: receives message,
199 -- checks for validity and decods, returns response.
200 handleClient :: Client -> ConfigReader -> IO Bool
201 handleClient client creader = do
202 !msg <- recvMsgExt client
204 RecvConnClosed -> logDebug "Connection closed" >> return False
205 RecvError err -> logWarning ("Error during message receiving: " ++ err) >>
208 case validateCall payload >>= decodeCall of
210 let errmsg = "Failed to parse request: " ++ err
212 sendMsg client $ buildResponse False (showJSON errmsg)
214 Ok args -> handleClientMsg client creader args
216 -- | Main client loop: runs one loop of 'handleClient', and if that
217 -- doesn't report a finished (closed) connection, restarts itself.
218 clientLoop :: Client -> ConfigReader -> IO ()
219 clientLoop client creader = do
220 result <- handleClient client creader
222 then clientLoop client creader
223 else closeClient client
225 -- | Main loop: accepts clients, forks an I/O thread to handle that
226 -- client, and then restarts.
227 mainLoop :: ConfigReader -> S.Socket -> IO ()
228 mainLoop creader socket = do
229 client <- acceptClient socket
230 _ <- forkIO $ clientLoop client creader
231 mainLoop creader socket
233 -- | Function that prepares the server socket.
234 prepQueryD :: Maybe FilePath -> IO (FilePath, S.Socket)
235 prepQueryD fpath = do
236 def_socket <- Path.defaultQuerySocket
237 let socket_path = fromMaybe def_socket fpath
238 cleanupSocket socket_path
239 s <- describeError "binding to the Luxi socket"
240 Nothing (Just socket_path) $ getServer socket_path
241 return (socket_path, s)
243 -- | Main function that runs the query endpoint.
244 runQueryD :: (FilePath, S.Socket) -> ConfigReader -> IO ()
245 runQueryD (socket_path, server) creader =
247 (mainLoop creader server)
248 (closeServer socket_path server)