root / htools / Ganeti / Query / Server.hs @ 4cab6703
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{-# LANGUAGE BangPatterns #-} |
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{-| Implementation of the Ganeti confd types. |
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-} |
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{- |
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Copyright (C) 2012 Google Inc. |
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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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module Ganeti.Query.Server |
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( ConfigReader |
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, runQueryD |
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) where |
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|
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import Control.Applicative |
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import Control.Concurrent |
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import Control.Exception |
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import Data.Bits (bitSize) |
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import Data.Maybe |
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import qualified Network.Socket as S |
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import qualified Text.JSON as J |
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import Text.JSON (showJSON, JSValue(..)) |
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import Text.JSON.Pretty (pp_value) |
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import System.Info (arch) |
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|
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import qualified Ganeti.Constants as C |
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import Ganeti.Daemon |
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import Ganeti.Objects |
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import qualified Ganeti.Config as Config |
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import Ganeti.BasicTypes |
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import Ganeti.Logging |
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import Ganeti.Luxi |
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import qualified Ganeti.Query.Language as Qlang |
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import Ganeti.Query.Query |
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-- | A type for functions that can return the configuration when |
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-- executed. |
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type ConfigReader = IO (Result ConfigData) |
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-- | Minimal wrapper to handle the missing config case. |
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handleCallWrapper :: Result ConfigData -> LuxiOp -> IO (Result JSValue) |
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handleCallWrapper (Bad msg) _ = |
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return . Bad $ "I do not have access to a valid configuration, cannot\ |
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\ process queries: " ++ msg |
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handleCallWrapper (Ok config) op = handleCall config op |
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-- | Actual luxi operation handler. |
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handleCall :: ConfigData -> LuxiOp -> IO (Result JSValue) |
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handleCall cdata QueryClusterInfo = |
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let cluster = configCluster cdata |
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hypervisors = clusterEnabledHypervisors cluster |
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bits = show (bitSize (0::Int)) ++ "bits" |
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arch_tuple = [bits, arch] |
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obj = [ ("software_version", showJSON $ C.releaseVersion) |
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, ("protocol_version", showJSON $ C.protocolVersion) |
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, ("config_version", showJSON $ C.configVersion) |
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, ("os_api_version", showJSON $ maximum C.osApiVersions) |
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, ("export_version", showJSON $ C.exportVersion) |
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, ("architecture", showJSON $ arch_tuple) |
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, ("name", showJSON $ clusterClusterName cluster) |
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, ("master", showJSON $ clusterMasterNode cluster) |
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, ("default_hypervisor", showJSON $ head hypervisors) |
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, ("enabled_hypervisors", showJSON $ hypervisors) |
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, ("hvparams", showJSON $ clusterHvparams cluster) |
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, ("os_hvp", showJSON $ clusterOsHvp cluster) |
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, ("beparams", showJSON $ clusterBeparams cluster) |
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, ("osparams", showJSON $ clusterOsparams cluster) |
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, ("ipolicy", showJSON $ clusterIpolicy cluster) |
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, ("nicparams", showJSON $ clusterNicparams cluster) |
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, ("ndparams", showJSON $ clusterNdparams cluster) |
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, ("diskparams", showJSON $ clusterDiskparams cluster) |
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, ("candidate_pool_size", |
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showJSON $ clusterCandidatePoolSize cluster) |
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, ("master_netdev", showJSON $ clusterMasterNetdev cluster) |
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, ("master_netmask", showJSON $ clusterMasterNetmask cluster) |
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, ("use_external_mip_script", |
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showJSON $ clusterUseExternalMipScript cluster) |
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, ("volume_group_name", showJSON $clusterVolumeGroupName cluster) |
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, ("drbd_usermode_helper", |
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maybe JSNull showJSON (clusterDrbdUsermodeHelper cluster)) |
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, ("file_storage_dir", showJSON $ clusterFileStorageDir cluster) |
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, ("shared_file_storage_dir", |
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showJSON $ clusterSharedFileStorageDir cluster) |
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, ("maintain_node_health", |
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showJSON $ clusterMaintainNodeHealth cluster) |
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, ("ctime", showJSON $ clusterCtime cluster) |
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, ("mtime", showJSON $ clusterMtime cluster) |
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, ("uuid", showJSON $ clusterUuid cluster) |
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, ("tags", showJSON $ clusterTags cluster) |
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, ("uid_pool", showJSON $ clusterUidPool cluster) |
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, ("default_iallocator", |
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showJSON $ clusterDefaultIallocator cluster) |
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, ("reserved_lvs", showJSON $ clusterReservedLvs cluster) |
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, ("primary_ip_version", |
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showJSON . ipFamilyToVersion $ clusterPrimaryIpFamily cluster) |
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, ("prealloc_wipe_disks", |
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showJSON $ clusterPreallocWipeDisks cluster) |
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, ("hidden_os", showJSON $ clusterHiddenOs cluster) |
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, ("blacklisted_os", showJSON $ clusterBlacklistedOs cluster) |
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] |
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|
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in return . Ok . J.makeObj $ obj |
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handleCall cfg (QueryTags kind name) = |
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let tags = case kind of |
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TagCluster -> Ok . clusterTags $ configCluster cfg |
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TagGroup -> groupTags <$> Config.getGroup cfg name |
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TagNode -> nodeTags <$> Config.getNode cfg name |
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TagInstance -> instTags <$> Config.getInstance cfg name |
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in return (J.showJSON <$> tags) |
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handleCall cfg (Query qkind qfields qfilter) = do |
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result <- query cfg (Qlang.Query qkind qfields qfilter) |
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return $ J.showJSON <$> result |
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handleCall _ (QueryFields qkind qfields) = do |
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let result = queryFields (Qlang.QueryFields qkind qfields) |
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return $ J.showJSON <$> result |
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handleCall _ op = |
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return . Bad $ "Luxi call '" ++ strOfOp op ++ "' not implemented" |
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-- | Given a decoded luxi request, executes it and sends the luxi |
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-- response back to the client. |
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handleClientMsg :: Client -> ConfigReader -> LuxiOp -> IO Bool |
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handleClientMsg client creader args = do |
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cfg <- creader |
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logDebug $ "Request: " ++ show args |
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call_result <- handleCallWrapper cfg args |
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(!status, !rval) <- |
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case call_result of |
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Bad err -> do |
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let errmsg = "Failed to execute request: " ++ err |
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logWarning errmsg |
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return (False, showJSON errmsg) |
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Ok result -> do |
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logDebug $ "Result " ++ show (pp_value result) |
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return (True, result) |
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sendMsg client $ buildResponse status rval |
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return True |
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-- | Handles one iteration of the client protocol: receives message, |
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-- checks for validity and decods, returns response. |
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handleClient :: Client -> ConfigReader -> IO Bool |
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handleClient client creader = do |
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!msg <- recvMsgExt client |
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case msg of |
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RecvConnClosed -> logDebug "Connection closed" >> return False |
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RecvError err -> logWarning ("Error during message receiving: " ++ err) >> |
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return False |
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RecvOk payload -> |
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case validateCall payload >>= decodeCall of |
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Bad err -> do |
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let errmsg = "Failed to parse request: " ++ err |
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logWarning errmsg |
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sendMsg client $ buildResponse False (showJSON errmsg) |
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return False |
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Ok args -> handleClientMsg client creader args |
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-- | Main client loop: runs one loop of 'handleClient', and if that |
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-- doesn't repot a finished (closed) connection, restarts itself. |
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clientLoop :: Client -> ConfigReader -> IO () |
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clientLoop client creader = do |
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result <- handleClient client creader |
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if result |
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then clientLoop client creader |
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else closeClient client |
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-- | Main loop: accepts clients, forks an I/O thread to handle that |
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-- client, and then restarts. |
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mainLoop :: ConfigReader -> S.Socket -> IO () |
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mainLoop creader socket = do |
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client <- acceptClient socket |
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_ <- forkIO $ clientLoop client creader |
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mainLoop creader socket |
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-- | Main function that runs the query endpoint. This should be the |
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-- only one exposed from this module. |
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runQueryD :: Maybe FilePath -> ConfigReader -> IO () |
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runQueryD fpath creader = do |
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let socket_path = fromMaybe C.querySocket fpath |
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cleanupSocket socket_path |
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bracket |
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(getServer socket_path) |
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(closeServer socket_path) |
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(mainLoop creader) |